socket.c 234.8 KB
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/* SCTP kernel implementation
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 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2003 Intel Corp.
 * Copyright (c) 2001-2002 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 *
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 * This file is part of the SCTP kernel implementation
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 *
 * These functions interface with the sockets layer to implement the
 * SCTP Extensions for the Sockets API.
 *
 * Note that the descriptions from the specification are USER level
 * functions--this file is the functions which populate the struct proto
 * for SCTP which is the BOTTOM of the sockets interface.
 *
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 * This SCTP implementation is free software;
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 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
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 * This SCTP implementation is distributed in the hope that it
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 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
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 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
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 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
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 *    lksctp developers <linux-sctp@vger.kernel.org>
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 *
 * Written or modified by:
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Narasimha Budihal     <narsi@refcode.org>
 *    Karl Knutson          <karl@athena.chicago.il.us>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Xingang Guo           <xingang.guo@intel.com>
 *    Daisy Chang           <daisyc@us.ibm.com>
 *    Sridhar Samudrala     <samudrala@us.ibm.com>
 *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
 *    Ardelle Fan	    <ardelle.fan@intel.com>
 *    Ryan Layer	    <rmlayer@us.ibm.com>
 *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
 *    Kevin Gao             <kevin.gao@intel.com>
 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <crypto/hash.h>
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#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/time.h>
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#include <linux/sched/signal.h>
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#include <linux/ip.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/compat.h>
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#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
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#include <net/busy_poll.h>
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#include <linux/socket.h> /* for sa_family_t */
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#include <linux/export.h>
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#include <net/sock.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
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#include <net/sctp/stream_sched.h>
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/* Forward declarations for internal helper functions. */
static int sctp_writeable(struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
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static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
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				size_t msg_len);
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static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
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static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
static int sctp_wait_for_accept(struct sock *sk, long timeo);
static void sctp_wait_for_close(struct sock *sk, long timeo);
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static void sctp_destruct_sock(struct sock *sk);
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static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
					union sctp_addr *addr, int len);
static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf(struct sctp_association *asoc,
			    struct sctp_chunk *chunk);
static int sctp_do_bind(struct sock *, union sctp_addr *, int);
static int sctp_autobind(struct sock *sk);
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static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
			      struct sctp_association *assoc,
			      enum sctp_socket_type type);
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static unsigned long sctp_memory_pressure;
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static atomic_long_t sctp_memory_allocated;
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struct percpu_counter sctp_sockets_allocated;
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static void sctp_enter_memory_pressure(struct sock *sk)
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{
	sctp_memory_pressure = 1;
}


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/* Get the sndbuf space available at the time on the association.  */
static inline int sctp_wspace(struct sctp_association *asoc)
{
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	int amt;
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	if (asoc->ep->sndbuf_policy)
		amt = asoc->sndbuf_used;
	else
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		amt = sk_wmem_alloc_get(asoc->base.sk);
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	if (amt >= asoc->base.sk->sk_sndbuf) {
		if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
			amt = 0;
		else {
			amt = sk_stream_wspace(asoc->base.sk);
			if (amt < 0)
				amt = 0;
		}
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	} else {
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		amt = asoc->base.sk->sk_sndbuf - amt;
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	}
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	return amt;
}

/* Increment the used sndbuf space count of the corresponding association by
 * the size of the outgoing data chunk.
 * Also, set the skb destructor for sndbuf accounting later.
 *
 * Since it is always 1-1 between chunk and skb, and also a new skb is always
 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
 * destructor in the data chunk skb for the purpose of the sndbuf space
 * tracking.
 */
static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
{
	struct sctp_association *asoc = chunk->asoc;
	struct sock *sk = asoc->base.sk;

	/* The sndbuf space is tracked per association.  */
	sctp_association_hold(asoc);

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	skb_set_owner_w(chunk->skb, sk);

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	chunk->skb->destructor = sctp_wfree;
	/* Save the chunk pointer in skb for sctp_wfree to use later.  */
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	skb_shinfo(chunk->skb)->destructor_arg = chunk;
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	asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

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	refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
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	sk->sk_wmem_queued += chunk->skb->truesize;
	sk_mem_charge(sk, chunk->skb->truesize);
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}

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static void sctp_clear_owner_w(struct sctp_chunk *chunk)
{
	skb_orphan(chunk->skb);
}

static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
				       void (*cb)(struct sctp_chunk *))

{
	struct sctp_outq *q = &asoc->outqueue;
	struct sctp_transport *t;
	struct sctp_chunk *chunk;

	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
			cb(chunk);

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	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
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		cb(chunk);

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	list_for_each_entry(chunk, &q->sacked, transmitted_list)
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		cb(chunk);

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	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
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		cb(chunk);

	list_for_each_entry(chunk, &q->out_chunk_list, list)
		cb(chunk);
}

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static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
				 void (*cb)(struct sk_buff *, struct sock *))

{
	struct sk_buff *skb, *tmp;

	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
		cb(skb, sk);

	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
		cb(skb, sk);

	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
		cb(skb, sk);
}

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/* Verify that this is a valid address. */
static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
				   int len)
{
	struct sctp_af *af;

	/* Verify basic sockaddr. */
	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
	if (!af)
		return -EINVAL;

	/* Is this a valid SCTP address?  */
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	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
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		return -EINVAL;

	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
		return -EINVAL;

	return 0;
}

/* Look up the association by its id.  If this is not a UDP-style
 * socket, the ID field is always ignored.
 */
struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
{
	struct sctp_association *asoc = NULL;

	/* If this is not a UDP-style socket, assoc id should be ignored. */
	if (!sctp_style(sk, UDP)) {
		/* Return NULL if the socket state is not ESTABLISHED. It
		 * could be a TCP-style listening socket or a socket which
		 * hasn't yet called connect() to establish an association.
		 */
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		if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
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			return NULL;

		/* Get the first and the only association from the list. */
		if (!list_empty(&sctp_sk(sk)->ep->asocs))
			asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
					  struct sctp_association, asocs);
		return asoc;
	}

	/* Otherwise this is a UDP-style socket. */
	if (!id || (id == (sctp_assoc_t)-1))
		return NULL;

	spin_lock_bh(&sctp_assocs_id_lock);
	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
	spin_unlock_bh(&sctp_assocs_id_lock);

	if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
		return NULL;

	return asoc;
}

/* Look up the transport from an address and an assoc id. If both address and
 * id are specified, the associations matching the address and the id should be
 * the same.
 */
static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
					      struct sockaddr_storage *addr,
					      sctp_assoc_t id)
{
	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
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	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
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	union sctp_addr *laddr = (union sctp_addr *)addr;
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	struct sctp_transport *transport;

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	if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
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		return NULL;
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	addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
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					       laddr,
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					       &transport);

	if (!addr_asoc)
		return NULL;

	id_asoc = sctp_id2assoc(sk, id);
	if (id_asoc && (id_asoc != addr_asoc))
		return NULL;

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	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
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						(union sctp_addr *)addr);

	return transport;
}

/* API 3.1.2 bind() - UDP Style Syntax
 * The syntax of bind() is,
 *
 *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
 *
 *   sd      - the socket descriptor returned by socket().
 *   addr    - the address structure (struct sockaddr_in or struct
 *             sockaddr_in6 [RFC 2553]),
 *   addr_len - the size of the address structure.
 */
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static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
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{
	int retval = 0;

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	lock_sock(sk);
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	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
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	/* Disallow binding twice. */
	if (!sctp_sk(sk)->ep->base.bind_addr.port)
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		retval = sctp_do_bind(sk, (union sctp_addr *)addr,
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				      addr_len);
	else
		retval = -EINVAL;

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	release_sock(sk);
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	return retval;
}

static long sctp_get_port_local(struct sock *, union sctp_addr *);

/* Verify this is a valid sockaddr. */
static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
					union sctp_addr *addr, int len)
{
	struct sctp_af *af;

	/* Check minimum size.  */
	if (len < sizeof (struct sockaddr))
		return NULL;

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	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
		return NULL;

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	/* V4 mapped address are really of AF_INET family */
	if (addr->sa.sa_family == AF_INET6 &&
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	    ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
	    !opt->pf->af_supported(AF_INET, opt))
		return NULL;
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	/* If we get this far, af is valid. */
	af = sctp_get_af_specific(addr->sa.sa_family);

	if (len < af->sockaddr_len)
		return NULL;

	return af;
}

/* Bind a local address either to an endpoint or to an association.  */
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static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
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{
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	struct net *net = sock_net(sk);
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	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
	struct sctp_bind_addr *bp = &ep->base.bind_addr;
	struct sctp_af *af;
	unsigned short snum;
	int ret = 0;

	/* Common sockaddr verification. */
	af = sctp_sockaddr_af(sp, addr, len);
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	if (!af) {
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		pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
			 __func__, sk, addr, len);
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		return -EINVAL;
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	}

	snum = ntohs(addr->v4.sin_port);

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	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
		 __func__, sk, &addr->sa, bp->port, snum, len);
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	/* PF specific bind() address verification. */
	if (!sp->pf->bind_verify(sp, addr))
		return -EADDRNOTAVAIL;

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	/* We must either be unbound, or bind to the same port.
	 * It's OK to allow 0 ports if we are already bound.
	 * We'll just inhert an already bound port in this case
	 */
	if (bp->port) {
		if (!snum)
			snum = bp->port;
		else if (snum != bp->port) {
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			pr_debug("%s: new port %d doesn't match existing port "
				 "%d\n", __func__, snum, bp->port);
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			return -EINVAL;
		}
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	}

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	if (snum && snum < inet_prot_sock(net) &&
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	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
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		return -EACCES;

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	/* See if the address matches any of the addresses we may have
	 * already bound before checking against other endpoints.
	 */
	if (sctp_bind_addr_match(bp, addr, sp))
		return -EINVAL;

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	/* Make sure we are allowed to bind here.
	 * The function sctp_get_port_local() does duplicate address
	 * detection.
	 */
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	addr->v4.sin_port = htons(snum);
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	if ((ret = sctp_get_port_local(sk, addr))) {
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		return -EADDRINUSE;
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	}

	/* Refresh ephemeral port.  */
	if (!bp->port)
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		bp->port = inet_sk(sk)->inet_num;
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	/* Add the address to the bind address list.
	 * Use GFP_ATOMIC since BHs will be disabled.
	 */
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	ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
				 SCTP_ADDR_SRC, GFP_ATOMIC);
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	/* Copy back into socket for getsockname() use. */
	if (!ret) {
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		inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
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		sp->pf->to_sk_saddr(addr, sk);
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	}

	return ret;
}

 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
 *
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 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
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 * at any one time.  If a sender, after sending an ASCONF chunk, decides
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 * it needs to transfer another ASCONF Chunk, it MUST wait until the
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 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
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 * subsequent ASCONF. Note this restriction binds each side, so at any
 * time two ASCONF may be in-transit on any given association (one sent
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 * from each endpoint).
 */
static int sctp_send_asconf(struct sctp_association *asoc,
			    struct sctp_chunk *chunk)
{
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	struct net 	*net = sock_net(asoc->base.sk);
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	int		retval = 0;

	/* If there is an outstanding ASCONF chunk, queue it for later
	 * transmission.
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	 */
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	if (asoc->addip_last_asconf) {
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		list_add_tail(&chunk->list, &asoc->addip_chunk_list);
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		goto out;
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	}

	/* Hold the chunk until an ASCONF_ACK is received. */
	sctp_chunk_hold(chunk);
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	retval = sctp_primitive_ASCONF(net, asoc, chunk);
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	if (retval)
		sctp_chunk_free(chunk);
	else
		asoc->addip_last_asconf = chunk;

out:
	return retval;
}

/* Add a list of addresses as bind addresses to local endpoint or
 * association.
 *
 * Basically run through each address specified in the addrs/addrcnt
 * array/length pair, determine if it is IPv6 or IPv4 and call
 * sctp_do_bind() on it.
 *
 * If any of them fails, then the operation will be reversed and the
 * ones that were added will be removed.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
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static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
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{
	int cnt;
	int retval = 0;
	void *addr_buf;
	struct sockaddr *sa_addr;
	struct sctp_af *af;

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	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
		 addrs, addrcnt);
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	addr_buf = addrs;
	for (cnt = 0; cnt < addrcnt; cnt++) {
		/* The list may contain either IPv4 or IPv6 address;
		 * determine the address length for walking thru the list.
		 */
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		sa_addr = addr_buf;
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		af = sctp_get_af_specific(sa_addr->sa_family);
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_add;
		}

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		retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
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				      af->sockaddr_len);

		addr_buf += af->sockaddr_len;

err_bindx_add:
		if (retval < 0) {
			/* Failed. Cleanup the ones that have been added */
			if (cnt > 0)
				sctp_bindx_rem(sk, addrs, cnt);
			return retval;
		}
	}

	return retval;
}

/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
 * associations that are part of the endpoint indicating that a list of local
 * addresses are added to the endpoint.
 *
544
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
545 546 547 548 549
 * association, we do not send the chunk for that association.  But it will not
 * affect other associations.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
550
static int sctp_send_asconf_add_ip(struct sock		*sk,
L
Linus Torvalds 已提交
551 552 553
				   struct sockaddr	*addrs,
				   int 			addrcnt)
{
554
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
555 556 557 558 559 560 561
	struct sctp_sock		*sp;
	struct sctp_endpoint		*ep;
	struct sctp_association		*asoc;
	struct sctp_bind_addr		*bp;
	struct sctp_chunk		*chunk;
	struct sctp_sockaddr_entry	*laddr;
	union sctp_addr			*addr;
562
	union sctp_addr			saveaddr;
L
Linus Torvalds 已提交
563 564 565 566 567 568
	void				*addr_buf;
	struct sctp_af			*af;
	struct list_head		*p;
	int 				i;
	int 				retval = 0;

569
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
570 571 572 573 574
		return retval;

	sp = sctp_sk(sk);
	ep = sp->ep;

575 576
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
577

578
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
579 580 581 582 583 584 585 586 587 588
		if (!asoc->peer.asconf_capable)
			continue;

		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
			continue;

		if (!sctp_state(asoc, ESTABLISHED))
			continue;

		/* Check if any address in the packed array of addresses is
589 590
		 * in the bind address list of the association. If so,
		 * do not send the asconf chunk to its peer, but continue with
L
Linus Torvalds 已提交
591 592 593 594
		 * other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
595
			addr = addr_buf;
L
Linus Torvalds 已提交
596 597 598 599 600 601 602 603 604 605 606 607 608 609
			af = sctp_get_af_specific(addr->v4.sin_family);
			if (!af) {
				retval = -EINVAL;
				goto out;
			}

			if (sctp_assoc_lookup_laddr(asoc, addr))
				break;

			addr_buf += af->sockaddr_len;
		}
		if (i < addrcnt)
			continue;

610 611
		/* Use the first valid address in bind addr list of
		 * association as Address Parameter of ASCONF CHUNK.
L
Linus Torvalds 已提交
612 613 614 615
		 */
		bp = &asoc->base.bind_addr;
		p = bp->address_list.next;
		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
616
		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
L
Linus Torvalds 已提交
617 618 619 620 621 622
						   addrcnt, SCTP_PARAM_ADD_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

623 624
		/* Add the new addresses to the bind address list with
		 * use_as_src set to 0.
L
Linus Torvalds 已提交
625
		 */
626 627
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
628
			addr = addr_buf;
629 630
			af = sctp_get_af_specific(addr->v4.sin_family);
			memcpy(&saveaddr, addr, af->sockaddr_len);
631
			retval = sctp_add_bind_addr(bp, &saveaddr,
632
						    sizeof(saveaddr),
633
						    SCTP_ADDR_NEW, GFP_ATOMIC);
634 635
			addr_buf += af->sockaddr_len;
		}
636 637 638 639 640 641
		if (asoc->src_out_of_asoc_ok) {
			struct sctp_transport *trans;

			list_for_each_entry(trans,
			    &asoc->peer.transport_addr_list, transports) {
				/* Clear the source and route cache */
642
				sctp_transport_dst_release(trans);
643 644 645 646
				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
				    2*asoc->pathmtu, 4380));
				trans->ssthresh = asoc->peer.i.a_rwnd;
				trans->rto = asoc->rto_initial;
647
				sctp_max_rto(asoc, trans);
648 649 650 651 652 653
				trans->rtt = trans->srtt = trans->rttvar = 0;
				sctp_transport_route(trans, NULL,
				    sctp_sk(asoc->base.sk));
			}
		}
		retval = sctp_send_asconf(asoc, chunk);
L
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654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
	}

out:
	return retval;
}

/* Remove a list of addresses from bind addresses list.  Do not remove the
 * last address.
 *
 * Basically run through each address specified in the addrs/addrcnt
 * array/length pair, determine if it is IPv6 or IPv4 and call
 * sctp_del_bind() on it.
 *
 * If any of them fails, then the operation will be reversed and the
 * ones that were removed will be added back.
 *
 * At least one address has to be left; if only one address is
 * available, the operation will return -EBUSY.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
675
static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
L
Linus Torvalds 已提交
676 677 678 679 680 681 682
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
	int cnt;
	struct sctp_bind_addr *bp = &ep->base.bind_addr;
	int retval = 0;
	void *addr_buf;
683
	union sctp_addr *sa_addr;
L
Linus Torvalds 已提交
684 685
	struct sctp_af *af;

686 687
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
688 689 690 691 692 693 694 695 696 697 698 699 700

	addr_buf = addrs;
	for (cnt = 0; cnt < addrcnt; cnt++) {
		/* If the bind address list is empty or if there is only one
		 * bind address, there is nothing more to be removed (we need
		 * at least one address here).
		 */
		if (list_empty(&bp->address_list) ||
		    (sctp_list_single_entry(&bp->address_list))) {
			retval = -EBUSY;
			goto err_bindx_rem;
		}

J
Joe Perches 已提交
701
		sa_addr = addr_buf;
702
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
L
Linus Torvalds 已提交
703 704 705 706
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_rem;
		}
707 708 709 710 711 712

		if (!af->addr_valid(sa_addr, sp, NULL)) {
			retval = -EADDRNOTAVAIL;
			goto err_bindx_rem;
		}

713 714
		if (sa_addr->v4.sin_port &&
		    sa_addr->v4.sin_port != htons(bp->port)) {
L
Linus Torvalds 已提交
715 716 717 718
			retval = -EINVAL;
			goto err_bindx_rem;
		}

719 720 721
		if (!sa_addr->v4.sin_port)
			sa_addr->v4.sin_port = htons(bp->port);

L
Linus Torvalds 已提交
722 723 724 725 726 727 728
		/* FIXME - There is probably a need to check if sk->sk_saddr and
		 * sk->sk_rcv_addr are currently set to one of the addresses to
		 * be removed. This is something which needs to be looked into
		 * when we are fixing the outstanding issues with multi-homing
		 * socket routing and failover schemes. Refer to comments in
		 * sctp_do_bind(). -daisy
		 */
729
		retval = sctp_del_bind_addr(bp, sa_addr);
L
Linus Torvalds 已提交
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747

		addr_buf += af->sockaddr_len;
err_bindx_rem:
		if (retval < 0) {
			/* Failed. Add the ones that has been removed back */
			if (cnt > 0)
				sctp_bindx_add(sk, addrs, cnt);
			return retval;
		}
	}

	return retval;
}

/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
 * the associations that are part of the endpoint indicating that a list of
 * local addresses are removed from the endpoint.
 *
748
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
749 750 751 752 753 754 755 756 757
 * association, we do not send the chunk for that association.  But it will not
 * affect other associations.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
static int sctp_send_asconf_del_ip(struct sock		*sk,
				   struct sockaddr	*addrs,
				   int			addrcnt)
{
758
	struct net *net = sock_net(sk);
L
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759 760 761
	struct sctp_sock	*sp;
	struct sctp_endpoint	*ep;
	struct sctp_association	*asoc;
762
	struct sctp_transport	*transport;
L
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763 764 765 766 767
	struct sctp_bind_addr	*bp;
	struct sctp_chunk	*chunk;
	union sctp_addr		*laddr;
	void			*addr_buf;
	struct sctp_af		*af;
768
	struct sctp_sockaddr_entry *saddr;
L
Linus Torvalds 已提交
769 770
	int 			i;
	int 			retval = 0;
771
	int			stored = 0;
L
Linus Torvalds 已提交
772

773
	chunk = NULL;
774
	if (!net->sctp.addip_enable)
L
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775 776 777 778 779
		return retval;

	sp = sctp_sk(sk);
	ep = sp->ep;

780 781
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
782

783
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
784 785 786 787 788 789 790 791 792 793 794

		if (!asoc->peer.asconf_capable)
			continue;

		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
			continue;

		if (!sctp_state(asoc, ESTABLISHED))
			continue;

		/* Check if any address in the packed array of addresses is
795
		 * not present in the bind address list of the association.
L
Linus Torvalds 已提交
796 797 798 799 800
		 * If so, do not send the asconf chunk to its peer, but
		 * continue with other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
801
			laddr = addr_buf;
L
Linus Torvalds 已提交
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
			af = sctp_get_af_specific(laddr->v4.sin_family);
			if (!af) {
				retval = -EINVAL;
				goto out;
			}

			if (!sctp_assoc_lookup_laddr(asoc, laddr))
				break;

			addr_buf += af->sockaddr_len;
		}
		if (i < addrcnt)
			continue;

		/* Find one address in the association's bind address list
		 * that is not in the packed array of addresses. This is to
		 * make sure that we do not delete all the addresses in the
		 * association.
		 */
		bp = &asoc->base.bind_addr;
		laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
					       addrcnt, sp);
824 825 826 827 828
		if ((laddr == NULL) && (addrcnt == 1)) {
			if (asoc->asconf_addr_del_pending)
				continue;
			asoc->asconf_addr_del_pending =
			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
829 830 831 832
			if (asoc->asconf_addr_del_pending == NULL) {
				retval = -ENOMEM;
				goto out;
			}
833 834 835 836 837 838 839 840 841 842 843 844 845
			asoc->asconf_addr_del_pending->sa.sa_family =
				    addrs->sa_family;
			asoc->asconf_addr_del_pending->v4.sin_port =
				    htons(bp->port);
			if (addrs->sa_family == AF_INET) {
				struct sockaddr_in *sin;

				sin = (struct sockaddr_in *)addrs;
				asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
			} else if (addrs->sa_family == AF_INET6) {
				struct sockaddr_in6 *sin6;

				sin6 = (struct sockaddr_in6 *)addrs;
A
Alexey Dobriyan 已提交
846
				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
847
			}
848 849 850 851 852

			pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
				 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
				 asoc->asconf_addr_del_pending);

853 854 855 856
			asoc->src_out_of_asoc_ok = 1;
			stored = 1;
			goto skip_mkasconf;
		}
L
Linus Torvalds 已提交
857

858 859 860
		if (laddr == NULL)
			return -EINVAL;

861 862 863 864
		/* We do not need RCU protection throughout this loop
		 * because this is done under a socket lock from the
		 * setsockopt call.
		 */
L
Linus Torvalds 已提交
865 866 867 868 869 870 871
		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
						   SCTP_PARAM_DEL_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

872
skip_mkasconf:
873 874 875 876 877
		/* Reset use_as_src flag for the addresses in the bind address
		 * list that are to be deleted.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
878
			laddr = addr_buf;
879
			af = sctp_get_af_specific(laddr->v4.sin_family);
880
			list_for_each_entry(saddr, &bp->address_list, list) {
881
				if (sctp_cmp_addr_exact(&saddr->a, laddr))
882
					saddr->state = SCTP_ADDR_DEL;
883 884 885
			}
			addr_buf += af->sockaddr_len;
		}
L
Linus Torvalds 已提交
886

887 888 889
		/* Update the route and saddr entries for all the transports
		 * as some of the addresses in the bind address list are
		 * about to be deleted and cannot be used as source addresses.
L
Linus Torvalds 已提交
890
		 */
891 892
		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
					transports) {
893
			sctp_transport_dst_release(transport);
894 895 896 897
			sctp_transport_route(transport, NULL,
					     sctp_sk(asoc->base.sk));
		}

898 899 900
		if (stored)
			/* We don't need to transmit ASCONF */
			continue;
901
		retval = sctp_send_asconf(asoc, chunk);
L
Linus Torvalds 已提交
902 903 904 905 906
	}
out:
	return retval;
}

907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
/* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
{
	struct sock *sk = sctp_opt2sk(sp);
	union sctp_addr *addr;
	struct sctp_af *af;

	/* It is safe to write port space in caller. */
	addr = &addrw->a;
	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
	af = sctp_get_af_specific(addr->sa.sa_family);
	if (!af)
		return -EINVAL;
	if (sctp_verify_addr(sk, addr, af->sockaddr_len))
		return -EINVAL;

	if (addrw->state == SCTP_ADDR_NEW)
		return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
	else
		return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
}

L
Linus Torvalds 已提交
929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
 *
 * API 8.1
 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
 *                int flags);
 *
 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 * or IPv6 addresses.
 *
 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 * Section 3.1.2 for this usage.
 *
 * addrs is a pointer to an array of one or more socket addresses. Each
 * address is contained in its appropriate structure (i.e. struct
 * sockaddr_in or struct sockaddr_in6) the family of the address type
V
Ville Nuorvala 已提交
945
 * must be used to distinguish the address length (note that this
L
Linus Torvalds 已提交
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983
 * representation is termed a "packed array" of addresses). The caller
 * specifies the number of addresses in the array with addrcnt.
 *
 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
 * -1, and sets errno to the appropriate error code.
 *
 * For SCTP, the port given in each socket address must be the same, or
 * sctp_bindx() will fail, setting errno to EINVAL.
 *
 * The flags parameter is formed from the bitwise OR of zero or more of
 * the following currently defined flags:
 *
 * SCTP_BINDX_ADD_ADDR
 *
 * SCTP_BINDX_REM_ADDR
 *
 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
 * addresses from the association. The two flags are mutually exclusive;
 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
 * not remove all addresses from an association; sctp_bindx() will
 * reject such an attempt with EINVAL.
 *
 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
 * additional addresses with an endpoint after calling bind().  Or use
 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
 * socket is associated with so that no new association accepted will be
 * associated with those addresses. If the endpoint supports dynamic
 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
 * endpoint to send the appropriate message to the peer to change the
 * peers address lists.
 *
 * Adding and removing addresses from a connected association is
 * optional functionality. Implementations that do not support this
 * functionality should return EOPNOTSUPP.
 *
 * Basically do nothing but copying the addresses from user to kernel
 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
F
Frank Filz 已提交
984 985
 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 * from userspace.
L
Linus Torvalds 已提交
986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
 *
 * We don't use copy_from_user() for optimization: we first do the
 * sanity checks (buffer size -fast- and access check-healthy
 * pointer); if all of those succeed, then we can alloc the memory
 * (expensive operation) needed to copy the data to kernel. Then we do
 * the copying without checking the user space area
 * (__copy_from_user()).
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 * op        Operation to perform (add or remove, see the flags of
 *           sctp_bindx)
 *
 * Returns 0 if ok, <0 errno code on error.
 */
1005
static int sctp_setsockopt_bindx(struct sock *sk,
1006 1007
				 struct sockaddr __user *addrs,
				 int addrs_size, int op)
L
Linus Torvalds 已提交
1008 1009 1010 1011 1012 1013 1014 1015 1016
{
	struct sockaddr *kaddrs;
	int err;
	int addrcnt = 0;
	int walk_size = 0;
	struct sockaddr *sa_addr;
	void *addr_buf;
	struct sctp_af *af;

1017 1018
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
		 __func__, sk, addrs, addrs_size, op);
L
Linus Torvalds 已提交
1019 1020 1021 1022 1023 1024 1025 1026 1027

	if (unlikely(addrs_size <= 0))
		return -EINVAL;

	/* Check the user passed a healthy pointer.  */
	if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
		return -EFAULT;

	/* Alloc space for the address array in kernel memory.  */
1028
	kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
L
Linus Torvalds 已提交
1029 1030 1031 1032 1033 1034 1035 1036
	if (unlikely(!kaddrs))
		return -ENOMEM;

	if (__copy_from_user(kaddrs, addrs, addrs_size)) {
		kfree(kaddrs);
		return -EFAULT;
	}

1037
	/* Walk through the addrs buffer and count the number of addresses. */
L
Linus Torvalds 已提交
1038 1039
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
1040 1041 1042 1043 1044
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			kfree(kaddrs);
			return -EINVAL;
		}

J
Joe Perches 已提交
1045
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
1046 1047 1048 1049
		af = sctp_get_af_specific(sa_addr->sa_family);

		/* If the address family is not supported or if this address
		 * causes the address buffer to overflow return EINVAL.
1050
		 */
L
Linus Torvalds 已提交
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
			kfree(kaddrs);
			return -EINVAL;
		}
		addrcnt++;
		addr_buf += af->sockaddr_len;
		walk_size += af->sockaddr_len;
	}

	/* Do the work. */
	switch (op) {
	case SCTP_BINDX_ADD_ADDR:
		err = sctp_bindx_add(sk, kaddrs, addrcnt);
		if (err)
			goto out;
		err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
		break;

	case SCTP_BINDX_REM_ADDR:
		err = sctp_bindx_rem(sk, kaddrs, addrcnt);
		if (err)
			goto out;
		err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
		break;

	default:
		err = -EINVAL;
		break;
1079
	}
L
Linus Torvalds 已提交
1080 1081 1082 1083 1084 1085 1086

out:
	kfree(kaddrs);

	return err;
}

F
Frank Filz 已提交
1087 1088 1089 1090 1091
/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
 *
 * Common routine for handling connect() and sctp_connectx().
 * Connect will come in with just a single address.
 */
1092
static int __sctp_connect(struct sock *sk,
F
Frank Filz 已提交
1093
			  struct sockaddr *kaddrs,
1094 1095
			  int addrs_size,
			  sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1096
{
1097
	struct net *net = sock_net(sk);
F
Frank Filz 已提交
1098 1099 1100 1101 1102 1103
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sctp_association *asoc = NULL;
	struct sctp_association *asoc2;
	struct sctp_transport *transport;
	union sctp_addr to;
X
Xin Long 已提交
1104
	enum sctp_scope scope;
F
Frank Filz 已提交
1105 1106 1107 1108
	long timeo;
	int err = 0;
	int addrcnt = 0;
	int walk_size = 0;
1109
	union sctp_addr *sa_addr = NULL;
F
Frank Filz 已提交
1110
	void *addr_buf;
1111
	unsigned short port;
1112
	unsigned int f_flags = 0;
F
Frank Filz 已提交
1113 1114 1115 1116 1117 1118 1119 1120 1121

	sp = sctp_sk(sk);
	ep = sp->ep;

	/* connect() cannot be done on a socket that is already in ESTABLISHED
	 * state - UDP-style peeled off socket or a TCP-style socket that
	 * is already connected.
	 * It cannot be done even on a TCP-style listening socket.
	 */
1122
	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
F
Frank Filz 已提交
1123 1124 1125 1126 1127 1128 1129 1130
	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
		err = -EISCONN;
		goto out_free;
	}

	/* Walk through the addrs buffer and count the number of addresses. */
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
1131 1132
		struct sctp_af *af;

1133 1134 1135 1136 1137
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

J
Joe Perches 已提交
1138
		sa_addr = addr_buf;
1139
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
F
Frank Filz 已提交
1140 1141 1142 1143 1144 1145 1146 1147 1148

		/* If the address family is not supported or if this address
		 * causes the address buffer to overflow return EINVAL.
		 */
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

1149 1150
		port = ntohs(sa_addr->v4.sin_port);

1151 1152 1153 1154
		/* Save current address so we can work with it */
		memcpy(&to, sa_addr, af->sockaddr_len);

		err = sctp_verify_addr(sk, &to, af->sockaddr_len);
F
Frank Filz 已提交
1155 1156 1157
		if (err)
			goto out_free;

1158 1159 1160
		/* Make sure the destination port is correctly set
		 * in all addresses.
		 */
1161 1162
		if (asoc && asoc->peer.port && asoc->peer.port != port) {
			err = -EINVAL;
1163
			goto out_free;
1164
		}
F
Frank Filz 已提交
1165 1166 1167 1168

		/* Check if there already is a matching association on the
		 * endpoint (other than the one created here).
		 */
1169
		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
F
Frank Filz 已提交
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
		if (asoc2 && asoc2 != asoc) {
			if (asoc2->state >= SCTP_STATE_ESTABLISHED)
				err = -EISCONN;
			else
				err = -EALREADY;
			goto out_free;
		}

		/* If we could not find a matching association on the endpoint,
		 * make sure that there is no peeled-off association matching
		 * the peer address even on another socket.
		 */
1182
		if (sctp_endpoint_is_peeled_off(ep, &to)) {
F
Frank Filz 已提交
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
			err = -EADDRNOTAVAIL;
			goto out_free;
		}

		if (!asoc) {
			/* If a bind() or sctp_bindx() is not called prior to
			 * an sctp_connectx() call, the system picks an
			 * ephemeral port and will choose an address set
			 * equivalent to binding with a wildcard address.
			 */
			if (!ep->base.bind_addr.port) {
				if (sctp_autobind(sk)) {
					err = -EAGAIN;
					goto out_free;
				}
1198 1199
			} else {
				/*
1200 1201 1202 1203
				 * If an unprivileged user inherits a 1-many
				 * style socket with open associations on a
				 * privileged port, it MAY be permitted to
				 * accept new associations, but it SHOULD NOT
1204 1205
				 * be permitted to open new associations.
				 */
1206 1207 1208 1209
				if (ep->base.bind_addr.port <
				    inet_prot_sock(net) &&
				    !ns_capable(net->user_ns,
				    CAP_NET_BIND_SERVICE)) {
1210 1211 1212
					err = -EACCES;
					goto out_free;
				}
F
Frank Filz 已提交
1213 1214
			}

1215
			scope = sctp_scope(&to);
F
Frank Filz 已提交
1216 1217 1218 1219 1220
			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
			if (!asoc) {
				err = -ENOMEM;
				goto out_free;
			}
1221 1222 1223 1224 1225 1226 1227

			err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
							      GFP_KERNEL);
			if (err < 0) {
				goto out_free;
			}

F
Frank Filz 已提交
1228 1229 1230
		}

		/* Prime the peer's transport structures.  */
1231
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
F
Frank Filz 已提交
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}

		addrcnt++;
		addr_buf += af->sockaddr_len;
		walk_size += af->sockaddr_len;
	}

1243 1244 1245 1246 1247 1248 1249 1250 1251
	/* In case the user of sctp_connectx() wants an association
	 * id back, assign one now.
	 */
	if (assoc_id) {
		err = sctp_assoc_set_id(asoc, GFP_KERNEL);
		if (err < 0)
			goto out_free;
	}

1252
	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
F
Frank Filz 已提交
1253 1254 1255 1256 1257
	if (err < 0) {
		goto out_free;
	}

	/* Initialize sk's dport and daddr for getpeername() */
E
Eric Dumazet 已提交
1258
	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1259
	sp->pf->to_sk_daddr(sa_addr, sk);
1260
	sk->sk_err = 0;
F
Frank Filz 已提交
1261

1262 1263 1264 1265 1266 1267 1268 1269
	/* in-kernel sockets don't generally have a file allocated to them
	 * if all they do is call sock_create_kern().
	 */
	if (sk->sk_socket->file)
		f_flags = sk->sk_socket->file->f_flags;

	timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);

1270
	if (assoc_id)
1271
		*assoc_id = asoc->assoc_id;
1272 1273 1274 1275
	err = sctp_wait_for_connect(asoc, &timeo);
	/* Note: the asoc may be freed after the return of
	 * sctp_wait_for_connect.
	 */
F
Frank Filz 已提交
1276 1277 1278 1279 1280

	/* Don't free association on exit. */
	asoc = NULL;

out_free:
1281 1282
	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
		 __func__, asoc, kaddrs, err);
F
Frank Filz 已提交
1283

1284 1285 1286 1287 1288
	if (asoc) {
		/* sctp_primitive_ASSOCIATE may have added this association
		 * To the hash table, try to unhash it, just in case, its a noop
		 * if it wasn't hashed so we're safe
		 */
F
Frank Filz 已提交
1289
		sctp_association_free(asoc);
1290
	}
F
Frank Filz 已提交
1291 1292 1293 1294 1295 1296
	return err;
}

/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
 *
 * API 8.9
1297 1298
 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
 * 			sctp_assoc_t *asoc);
F
Frank Filz 已提交
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
 *
 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 * or IPv6 addresses.
 *
 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 * Section 3.1.2 for this usage.
 *
 * addrs is a pointer to an array of one or more socket addresses. Each
 * address is contained in its appropriate structure (i.e. struct
 * sockaddr_in or struct sockaddr_in6) the family of the address type
 * must be used to distengish the address length (note that this
 * representation is termed a "packed array" of addresses). The caller
 * specifies the number of addresses in the array with addrcnt.
 *
1314 1315 1316 1317
 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
 * the association id of the new association.  On failure, sctp_connectx()
 * returns -1, and sets errno to the appropriate error code.  The assoc_id
 * is not touched by the kernel.
F
Frank Filz 已提交
1318 1319 1320 1321 1322 1323 1324 1325
 *
 * For SCTP, the port given in each socket address must be the same, or
 * sctp_connectx() will fail, setting errno to EINVAL.
 *
 * An application can use sctp_connectx to initiate an association with
 * an endpoint that is multi-homed.  Much like sctp_bindx() this call
 * allows a caller to specify multiple addresses at which a peer can be
 * reached.  The way the SCTP stack uses the list of addresses to set up
L
Lucas De Marchi 已提交
1326
 * the association is implementation dependent.  This function only
F
Frank Filz 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
 * specifies that the stack will try to make use of all the addresses in
 * the list when needed.
 *
 * Note that the list of addresses passed in is only used for setting up
 * the association.  It does not necessarily equal the set of addresses
 * the peer uses for the resulting association.  If the caller wants to
 * find out the set of peer addresses, it must use sctp_getpaddrs() to
 * retrieve them after the association has been set up.
 *
 * Basically do nothing but copying the addresses from user to kernel
 * land and invoking either sctp_connectx(). This is used for tunneling
 * the sctp_connectx() request through sctp_setsockopt() from userspace.
 *
 * We don't use copy_from_user() for optimization: we first do the
 * sanity checks (buffer size -fast- and access check-healthy
 * pointer); if all of those succeed, then we can alloc the memory
 * (expensive operation) needed to copy the data to kernel. Then we do
 * the copying without checking the user space area
 * (__copy_from_user()).
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 *
1354
 * Returns >=0 if ok, <0 errno code on error.
F
Frank Filz 已提交
1355
 */
1356
static int __sctp_setsockopt_connectx(struct sock *sk,
F
Frank Filz 已提交
1357
				      struct sockaddr __user *addrs,
1358 1359
				      int addrs_size,
				      sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1360 1361
{
	struct sockaddr *kaddrs;
1362 1363
	gfp_t gfp = GFP_KERNEL;
	int err = 0;
F
Frank Filz 已提交
1364

1365 1366
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
		 __func__, sk, addrs, addrs_size);
F
Frank Filz 已提交
1367 1368 1369 1370 1371 1372 1373 1374 1375

	if (unlikely(addrs_size <= 0))
		return -EINVAL;

	/* Check the user passed a healthy pointer.  */
	if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
		return -EFAULT;

	/* Alloc space for the address array in kernel memory.  */
1376 1377 1378
	if (sk->sk_socket->file)
		gfp = GFP_USER | __GFP_NOWARN;
	kaddrs = kmalloc(addrs_size, gfp);
F
Frank Filz 已提交
1379 1380 1381 1382 1383 1384
	if (unlikely(!kaddrs))
		return -ENOMEM;

	if (__copy_from_user(kaddrs, addrs, addrs_size)) {
		err = -EFAULT;
	} else {
1385
		err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
F
Frank Filz 已提交
1386 1387 1388
	}

	kfree(kaddrs);
1389

F
Frank Filz 已提交
1390 1391 1392
	return err;
}

1393 1394 1395 1396
/*
 * This is an older interface.  It's kept for backward compatibility
 * to the option that doesn't provide association id.
 */
1397
static int sctp_setsockopt_connectx_old(struct sock *sk,
1398 1399
					struct sockaddr __user *addrs,
					int addrs_size)
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
{
	return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
}

/*
 * New interface for the API.  The since the API is done with a socket
 * option, to make it simple we feed back the association id is as a return
 * indication to the call.  Error is always negative and association id is
 * always positive.
 */
1410
static int sctp_setsockopt_connectx(struct sock *sk,
1411 1412
				    struct sockaddr __user *addrs,
				    int addrs_size)
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424
{
	sctp_assoc_t assoc_id = 0;
	int err = 0;

	err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);

	if (err)
		return err;
	else
		return assoc_id;
}

1425
/*
1426 1427
 * New (hopefully final) interface for the API.
 * We use the sctp_getaddrs_old structure so that use-space library
1428
 * can avoid any unnecessary allocations. The only different part
1429
 * is that we store the actual length of the address buffer into the
1430
 * addrs_num structure member. That way we can re-use the existing
1431
 * code.
1432
 */
1433 1434 1435 1436 1437 1438 1439 1440
#ifdef CONFIG_COMPAT
struct compat_sctp_getaddrs_old {
	sctp_assoc_t	assoc_id;
	s32		addr_num;
	compat_uptr_t	addrs;		/* struct sockaddr * */
};
#endif

1441
static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1442 1443
				     char __user *optval,
				     int __user *optlen)
1444
{
1445
	struct sctp_getaddrs_old param;
1446 1447 1448
	sctp_assoc_t assoc_id = 0;
	int err = 0;

1449
#ifdef CONFIG_COMPAT
1450
	if (in_compat_syscall()) {
1451
		struct compat_sctp_getaddrs_old param32;
1452

1453 1454 1455 1456
		if (len < sizeof(param32))
			return -EINVAL;
		if (copy_from_user(&param32, optval, sizeof(param32)))
			return -EFAULT;
1457

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
		param.assoc_id = param32.assoc_id;
		param.addr_num = param32.addr_num;
		param.addrs = compat_ptr(param32.addrs);
	} else
#endif
	{
		if (len < sizeof(param))
			return -EINVAL;
		if (copy_from_user(&param, optval, sizeof(param)))
			return -EFAULT;
	}
1469

1470 1471 1472
	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
					 param.addrs, param.addr_num,
					 &assoc_id);
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
	if (err == 0 || err == -EINPROGRESS) {
		if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
			return -EFAULT;
		if (put_user(sizeof(assoc_id), optlen))
			return -EFAULT;
	}

	return err;
}

L
Linus Torvalds 已提交
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
/* API 3.1.4 close() - UDP Style Syntax
 * Applications use close() to perform graceful shutdown (as described in
 * Section 10.1 of [SCTP]) on ALL the associations currently represented
 * by a UDP-style socket.
 *
 * The syntax is
 *
 *   ret = close(int sd);
 *
 *   sd      - the socket descriptor of the associations to be closed.
 *
 * To gracefully shutdown a specific association represented by the
 * UDP-style socket, an application should use the sendmsg() call,
 * passing no user data, but including the appropriate flag in the
 * ancillary data (see Section xxxx).
 *
 * If sd in the close() call is a branched-off socket representing only
 * one association, the shutdown is performed on that association only.
 *
 * 4.1.6 close() - TCP Style Syntax
 *
 * Applications use close() to gracefully close down an association.
 *
 * The syntax is:
 *
 *    int close(int sd);
 *
 *      sd      - the socket descriptor of the association to be closed.
 *
 * After an application calls close() on a socket descriptor, no further
 * socket operations will succeed on that descriptor.
 *
 * API 7.1.4 SO_LINGER
 *
 * An application using the TCP-style socket can use this option to
 * perform the SCTP ABORT primitive.  The linger option structure is:
 *
 *  struct  linger {
 *     int     l_onoff;                // option on/off
 *     int     l_linger;               // linger time
 * };
 *
 * To enable the option, set l_onoff to 1.  If the l_linger value is set
 * to 0, calling close() is the same as the ABORT primitive.  If the
 * value is set to a negative value, the setsockopt() call will return
 * an error.  If the value is set to a positive value linger_time, the
 * close() can be blocked for at most linger_time ms.  If the graceful
 * shutdown phase does not finish during this period, close() will
 * return but the graceful shutdown phase continues in the system.
 */
1533
static void sctp_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
1534
{
1535
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1536 1537 1538
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;
	struct list_head *pos, *temp;
1539
	unsigned int data_was_unread;
L
Linus Torvalds 已提交
1540

1541
	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
L
Linus Torvalds 已提交
1542

1543
	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
1544
	sk->sk_shutdown = SHUTDOWN_MASK;
1545
	inet_sk_set_state(sk, SCTP_SS_CLOSING);
L
Linus Torvalds 已提交
1546 1547 1548

	ep = sctp_sk(sk)->ep;

1549 1550 1551 1552
	/* Clean up any skbs sitting on the receive queue.  */
	data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
	data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);

1553
	/* Walk all associations on an endpoint.  */
L
Linus Torvalds 已提交
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
	list_for_each_safe(pos, temp, &ep->asocs) {
		asoc = list_entry(pos, struct sctp_association, asocs);

		if (sctp_style(sk, TCP)) {
			/* A closed association can still be in the list if
			 * it belongs to a TCP-style listening socket that is
			 * not yet accepted. If so, free it. If not, send an
			 * ABORT or SHUTDOWN based on the linger options.
			 */
			if (sctp_state(asoc, CLOSED)) {
				sctp_association_free(asoc);
1565 1566 1567
				continue;
			}
		}
L
Linus Torvalds 已提交
1568

1569 1570
		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
		    !skb_queue_empty(&asoc->ulpq.reasm) ||
1571
		    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1572
		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1573 1574 1575
			struct sctp_chunk *chunk;

			chunk = sctp_make_abort_user(asoc, NULL, 0);
1576
			sctp_primitive_ABORT(net, asoc, chunk);
1577
		} else
1578
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1579 1580 1581 1582 1583 1584 1585
	}

	/* On a TCP-style socket, block for at most linger_time if set. */
	if (sctp_style(sk, TCP) && timeout)
		sctp_wait_for_close(sk, timeout);

	/* This will run the backlog queue.  */
1586
	release_sock(sk);
L
Linus Torvalds 已提交
1587 1588 1589

	/* Supposedly, no process has access to the socket, but
	 * the net layers still may.
1590 1591
	 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
	 * held and that should be grabbed before socket lock.
L
Linus Torvalds 已提交
1592
	 */
1593
	spin_lock_bh(&net->sctp.addr_wq_lock);
1594
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1595 1596 1597 1598 1599 1600 1601

	/* Hold the sock, since sk_common_release() will put sock_put()
	 * and we have just a little more cleanup.
	 */
	sock_hold(sk);
	sk_common_release(sk);

1602
	bh_unlock_sock(sk);
1603
	spin_unlock_bh(&net->sctp.addr_wq_lock);
L
Linus Torvalds 已提交
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642

	sock_put(sk);

	SCTP_DBG_OBJCNT_DEC(sock);
}

/* Handle EPIPE error. */
static int sctp_error(struct sock *sk, int flags, int err)
{
	if (err == -EPIPE)
		err = sock_error(sk) ? : -EPIPE;
	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
		send_sig(SIGPIPE, current, 0);
	return err;
}

/* API 3.1.3 sendmsg() - UDP Style Syntax
 *
 * An application uses sendmsg() and recvmsg() calls to transmit data to
 * and receive data from its peer.
 *
 *  ssize_t sendmsg(int socket, const struct msghdr *message,
 *                  int flags);
 *
 *  socket  - the socket descriptor of the endpoint.
 *  message - pointer to the msghdr structure which contains a single
 *            user message and possibly some ancillary data.
 *
 *            See Section 5 for complete description of the data
 *            structures.
 *
 *  flags   - flags sent or received with the user message, see Section
 *            5 for complete description of the flags.
 *
 * Note:  This function could use a rewrite especially when explicit
 * connect support comes in.
 */
/* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */

X
Xin Long 已提交
1643 1644
static int sctp_msghdr_parse(const struct msghdr *msg,
			     struct sctp_cmsgs *cmsgs);
L
Linus Torvalds 已提交
1645

1646
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
L
Linus Torvalds 已提交
1647
{
1648
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1649 1650
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
1651
	struct sctp_association *new_asoc = NULL, *asoc = NULL;
L
Linus Torvalds 已提交
1652 1653
	struct sctp_transport *transport, *chunk_tp;
	struct sctp_chunk *chunk;
1654
	union sctp_addr to;
L
Linus Torvalds 已提交
1655
	struct sockaddr *msg_name = NULL;
1656
	struct sctp_sndrcvinfo default_sinfo;
L
Linus Torvalds 已提交
1657 1658 1659
	struct sctp_sndrcvinfo *sinfo;
	struct sctp_initmsg *sinit;
	sctp_assoc_t associd = 0;
X
Xin Long 已提交
1660
	struct sctp_cmsgs cmsgs = { NULL };
X
Xin Long 已提交
1661
	enum sctp_scope scope;
1662
	bool fill_sinfo_ttl = false, wait_connect = false;
L
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1663 1664
	struct sctp_datamsg *datamsg;
	int msg_flags = msg->msg_flags;
1665 1666 1667
	__u16 sinfo_flags = 0;
	long timeo;
	int err;
L
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1668 1669 1670 1671 1672

	err = 0;
	sp = sctp_sk(sk);
	ep = sp->ep;

1673 1674
	pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
		 msg, msg_len, ep);
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1675 1676 1677 1678 1679 1680 1681 1682 1683 1684

	/* We cannot send a message over a TCP-style listening socket. */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
		err = -EPIPE;
		goto out_nounlock;
	}

	/* Parse out the SCTP CMSGs.  */
	err = sctp_msghdr_parse(msg, &cmsgs);
	if (err) {
1685
		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
L
Linus Torvalds 已提交
1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
		goto out_nounlock;
	}

	/* Fetch the destination address for this packet.  This
	 * address only selects the association--it is not necessarily
	 * the address we will send to.
	 * For a peeled-off socket, msg_name is ignored.
	 */
	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
		int msg_namelen = msg->msg_namelen;

		err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
				       msg_namelen);
		if (err)
			return err;

		if (msg_namelen > sizeof(to))
			msg_namelen = sizeof(to);
		memcpy(&to, msg->msg_name, msg_namelen);
		msg_name = msg->msg_name;
	}

	sinit = cmsgs.init;
1709 1710 1711 1712 1713 1714 1715
	if (cmsgs.sinfo != NULL) {
		memset(&default_sinfo, 0, sizeof(default_sinfo));
		default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
		default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
		default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
		default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
		default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
L
Linus Torvalds 已提交
1716

1717 1718 1719 1720 1721 1722
		sinfo = &default_sinfo;
		fill_sinfo_ttl = true;
	} else {
		sinfo = cmsgs.srinfo;
	}
	/* Did the user specify SNDINFO/SNDRCVINFO? */
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727
	if (sinfo) {
		sinfo_flags = sinfo->sinfo_flags;
		associd = sinfo->sinfo_assoc_id;
	}

1728 1729
	pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
		 msg_len, sinfo_flags);
L
Linus Torvalds 已提交
1730

1731 1732
	/* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
	if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
L
Linus Torvalds 已提交
1733 1734 1735 1736
		err = -EINVAL;
		goto out_nounlock;
	}

1737 1738 1739
	/* If SCTP_EOF is set, no data can be sent. Disallow sending zero
	 * length messages when SCTP_EOF|SCTP_ABORT is not set.
	 * If SCTP_ABORT is set, the message length could be non zero with
L
Linus Torvalds 已提交
1740
	 * the msg_iov set to the user abort reason.
1741
	 */
1742 1743
	if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
	    (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
L
Linus Torvalds 已提交
1744 1745 1746 1747
		err = -EINVAL;
		goto out_nounlock;
	}

1748
	/* If SCTP_ADDR_OVER is set, there must be an address
L
Linus Torvalds 已提交
1749 1750
	 * specified in msg_name.
	 */
1751
	if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
L
Linus Torvalds 已提交
1752 1753 1754 1755 1756 1757
		err = -EINVAL;
		goto out_nounlock;
	}

	transport = NULL;

1758
	pr_debug("%s: about to look up association\n", __func__);
L
Linus Torvalds 已提交
1759

1760
	lock_sock(sk);
L
Linus Torvalds 已提交
1761 1762 1763 1764

	/* If a msg_name has been specified, assume this is to be used.  */
	if (msg_name) {
		/* Look for a matching association on the endpoint. */
1765
		asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778

		/* If we could not find a matching association on the
		 * endpoint, make sure that it is not a TCP-style
		 * socket that already has an association or there is
		 * no peeled-off association on another socket.
		 */
		if (!asoc &&
		    ((sctp_style(sk, TCP) &&
		      (sctp_sstate(sk, ESTABLISHED) ||
		       sctp_sstate(sk, CLOSING))) ||
		     sctp_endpoint_is_peeled_off(ep, &to))) {
			err = -EADDRNOTAVAIL;
			goto out_unlock;
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788
		}
	} else {
		asoc = sctp_id2assoc(sk, associd);
		if (!asoc) {
			err = -EPIPE;
			goto out_unlock;
		}
	}

	if (asoc) {
1789
		pr_debug("%s: just looked up association:%p\n", __func__, asoc);
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Linus Torvalds 已提交
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800

		/* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
		 * socket that has an association in CLOSED state. This can
		 * happen when an accepted socket has an association that is
		 * already CLOSED.
		 */
		if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
			err = -EPIPE;
			goto out_unlock;
		}

1801
		if (sinfo_flags & SCTP_EOF) {
1802 1803 1804
			pr_debug("%s: shutting down association:%p\n",
				 __func__, asoc);

1805
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1806 1807 1808
			err = 0;
			goto out_unlock;
		}
1809
		if (sinfo_flags & SCTP_ABORT) {
1810 1811 1812 1813 1814 1815 1816

			chunk = sctp_make_abort_user(asoc, msg, msg_len);
			if (!chunk) {
				err = -ENOMEM;
				goto out_unlock;
			}

1817 1818 1819
			pr_debug("%s: aborting association:%p\n",
				 __func__, asoc);

1820
			sctp_primitive_ABORT(net, asoc, chunk);
L
Linus Torvalds 已提交
1821 1822 1823 1824 1825 1826 1827
			err = 0;
			goto out_unlock;
		}
	}

	/* Do we need to create the association?  */
	if (!asoc) {
1828
		pr_debug("%s: there is no association yet\n", __func__);
L
Linus Torvalds 已提交
1829

1830
		if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
L
Linus Torvalds 已提交
1831 1832 1833 1834 1835 1836 1837 1838
			err = -EINVAL;
			goto out_unlock;
		}

		/* Check for invalid stream against the stream counts,
		 * either the default or the user specified stream counts.
		 */
		if (sinfo) {
1839
			if (!sinit || !sinit->sinit_num_ostreams) {
L
Linus Torvalds 已提交
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
				/* Check against the defaults. */
				if (sinfo->sinfo_stream >=
				    sp->initmsg.sinit_num_ostreams) {
					err = -EINVAL;
					goto out_unlock;
				}
			} else {
				/* Check against the requested.  */
				if (sinfo->sinfo_stream >=
				    sinit->sinit_num_ostreams) {
					err = -EINVAL;
					goto out_unlock;
				}
			}
		}

		/*
		 * API 3.1.2 bind() - UDP Style Syntax
		 * If a bind() or sctp_bindx() is not called prior to a
		 * sendmsg() call that initiates a new association, the
		 * system picks an ephemeral port and will choose an address
		 * set equivalent to binding with a wildcard address.
		 */
		if (!ep->base.bind_addr.port) {
			if (sctp_autobind(sk)) {
				err = -EAGAIN;
				goto out_unlock;
			}
1868 1869 1870 1871 1872 1873 1874 1875
		} else {
			/*
			 * If an unprivileged user inherits a one-to-many
			 * style socket with open associations on a privileged
			 * port, it MAY be permitted to accept new associations,
			 * but it SHOULD NOT be permitted to open new
			 * associations.
			 */
1876
			if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1877
			    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1878 1879 1880
				err = -EACCES;
				goto out_unlock;
			}
L
Linus Torvalds 已提交
1881 1882 1883 1884 1885 1886 1887 1888 1889
		}

		scope = sctp_scope(&to);
		new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
		if (!new_asoc) {
			err = -ENOMEM;
			goto out_unlock;
		}
		asoc = new_asoc;
1890 1891 1892 1893 1894
		err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
		if (err < 0) {
			err = -ENOMEM;
			goto out_free;
		}
L
Linus Torvalds 已提交
1895 1896 1897 1898 1899 1900

		/* If the SCTP_INIT ancillary data is specified, set all
		 * the association init values accordingly.
		 */
		if (sinit) {
			if (sinit->sinit_num_ostreams) {
1901 1902 1903 1904 1905 1906 1907 1908
				__u16 outcnt = sinit->sinit_num_ostreams;

				asoc->c.sinit_num_ostreams = outcnt;
				/* outcnt has been changed, so re-init stream */
				err = sctp_stream_init(&asoc->stream, outcnt, 0,
						       GFP_KERNEL);
				if (err)
					goto out_free;
L
Linus Torvalds 已提交
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
			}
			if (sinit->sinit_max_instreams) {
				asoc->c.sinit_max_instreams =
					sinit->sinit_max_instreams;
			}
			if (sinit->sinit_max_attempts) {
				asoc->max_init_attempts
					= sinit->sinit_max_attempts;
			}
			if (sinit->sinit_max_init_timeo) {
1919
				asoc->max_init_timeo =
L
Linus Torvalds 已提交
1920 1921 1922 1923 1924
				 msecs_to_jiffies(sinit->sinit_max_init_timeo);
			}
		}

		/* Prime the peer's transport structures.  */
1925
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
L
Linus Torvalds 已提交
1926 1927 1928 1929 1930 1931 1932
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}
	}

	/* ASSERT: we have a valid association at this point.  */
1933
	pr_debug("%s: we have a valid association\n", __func__);
L
Linus Torvalds 已提交
1934 1935

	if (!sinfo) {
1936 1937
		/* If the user didn't specify SNDINFO/SNDRCVINFO, make up
		 * one with some defaults.
L
Linus Torvalds 已提交
1938
		 */
1939
		memset(&default_sinfo, 0, sizeof(default_sinfo));
L
Linus Torvalds 已提交
1940 1941 1942 1943 1944 1945
		default_sinfo.sinfo_stream = asoc->default_stream;
		default_sinfo.sinfo_flags = asoc->default_flags;
		default_sinfo.sinfo_ppid = asoc->default_ppid;
		default_sinfo.sinfo_context = asoc->default_context;
		default_sinfo.sinfo_timetolive = asoc->default_timetolive;
		default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1946

L
Linus Torvalds 已提交
1947
		sinfo = &default_sinfo;
1948 1949 1950 1951 1952
	} else if (fill_sinfo_ttl) {
		/* In case SNDINFO was specified, we still need to fill
		 * it with a default ttl from the assoc here.
		 */
		sinfo->sinfo_timetolive = asoc->default_timetolive;
L
Linus Torvalds 已提交
1953 1954 1955 1956 1957 1958 1959 1960 1961 1962
	}

	/* API 7.1.7, the sndbuf size per association bounds the
	 * maximum size of data that can be sent in a single send call.
	 */
	if (msg_len > sk->sk_sndbuf) {
		err = -EMSGSIZE;
		goto out_free;
	}

1963
	if (asoc->pmtu_pending)
1964
		sctp_assoc_pending_pmtu(asoc);
1965

L
Linus Torvalds 已提交
1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
	/* If fragmentation is disabled and the message length exceeds the
	 * association fragmentation point, return EMSGSIZE.  The I-D
	 * does not specify what this error is, but this looks like
	 * a great fit.
	 */
	if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
		err = -EMSGSIZE;
		goto out_free;
	}

1976
	/* Check for invalid stream. */
1977
	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1978 1979
		err = -EINVAL;
		goto out_free;
L
Linus Torvalds 已提交
1980 1981
	}

1982 1983 1984 1985 1986 1987 1988
	/* Allocate sctp_stream_out_ext if not already done */
	if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
		err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
		if (err)
			goto out_free;
	}

X
Xin Long 已提交
1989 1990 1991
	if (sctp_wspace(asoc) < msg_len)
		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));

L
Linus Torvalds 已提交
1992 1993
	timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
	if (!sctp_wspace(asoc)) {
1994
		/* sk can be changed by peel off when waiting for buf. */
1995
		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1996 1997 1998 1999 2000 2001
		if (err) {
			if (err == -ESRCH) {
				/* asoc is already dead. */
				new_asoc = NULL;
				err = -EPIPE;
			}
L
Linus Torvalds 已提交
2002
			goto out_free;
2003
		}
L
Linus Torvalds 已提交
2004 2005 2006 2007
	}

	/* If an address is passed with the sendto/sendmsg call, it is used
	 * to override the primary destination address in the TCP model, or
2008
	 * when SCTP_ADDR_OVER flag is set in the UDP model.
L
Linus Torvalds 已提交
2009 2010
	 */
	if ((sctp_style(sk, TCP) && msg_name) ||
2011
	    (sinfo_flags & SCTP_ADDR_OVER)) {
2012
		chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
L
Linus Torvalds 已提交
2013 2014 2015 2016 2017 2018 2019 2020 2021
		if (!chunk_tp) {
			err = -EINVAL;
			goto out_free;
		}
	} else
		chunk_tp = NULL;

	/* Auto-connect, if we aren't connected already. */
	if (sctp_state(asoc, CLOSED)) {
2022
		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
L
Linus Torvalds 已提交
2023 2024
		if (err < 0)
			goto out_free;
2025

2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039
		/* If stream interleave is enabled, wait_connect has to be
		 * done earlier than data enqueue, as it needs to make data
		 * or idata according to asoc->intl_enable which is set
		 * after connection is done.
		 */
		if (sctp_sk(asoc->base.sk)->strm_interleave) {
			timeo = sock_sndtimeo(sk, 0);
			err = sctp_wait_for_connect(asoc, &timeo);
			if (err)
				goto out_unlock;
		} else {
			wait_connect = true;
		}

2040
		pr_debug("%s: we associated primitively\n", __func__);
L
Linus Torvalds 已提交
2041 2042 2043
	}

	/* Break the message into multiple chunks of maximum size. */
A
Al Viro 已提交
2044
	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
2045 2046
	if (IS_ERR(datamsg)) {
		err = PTR_ERR(datamsg);
L
Linus Torvalds 已提交
2047 2048
		goto out_free;
	}
2049
	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
L
Linus Torvalds 已提交
2050 2051

	/* Now send the (possibly) fragmented message. */
2052
	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2053 2054
		sctp_chunk_hold(chunk);

L
Linus Torvalds 已提交
2055 2056 2057 2058 2059 2060
		/* Do accounting for the write space.  */
		sctp_set_owner_w(chunk);

		chunk->transport = chunk_tp;
	}

2061 2062 2063 2064 2065
	/* Send it to the lower layers.  Note:  all chunks
	 * must either fail or succeed.   The lower layer
	 * works that way today.  Keep it that way or this
	 * breaks.
	 */
2066
	err = sctp_primitive_SEND(net, asoc, datamsg);
2067
	/* Did the lower layer accept the chunk? */
2068 2069
	if (err) {
		sctp_datamsg_free(datamsg);
2070
		goto out_free;
2071
	}
2072

2073
	pr_debug("%s: we sent primitively\n", __func__);
2074

2075
	sctp_datamsg_put(datamsg);
2076
	err = msg_len;
L
Linus Torvalds 已提交
2077

2078 2079 2080 2081 2082
	if (unlikely(wait_connect)) {
		timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
		sctp_wait_for_connect(asoc, &timeo);
	}

L
Linus Torvalds 已提交
2083 2084 2085 2086 2087 2088
	/* If we are already past ASSOCIATE, the lower
	 * layers are responsible for association cleanup.
	 */
	goto out_unlock;

out_free:
2089
	if (new_asoc)
L
Linus Torvalds 已提交
2090 2091
		sctp_association_free(asoc);
out_unlock:
2092
	release_sock(sk);
L
Linus Torvalds 已提交
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131

out_nounlock:
	return sctp_error(sk, msg_flags, err);

#if 0
do_sock_err:
	if (msg_len)
		err = msg_len;
	else
		err = sock_error(sk);
	goto out;

do_interrupted:
	if (msg_len)
		err = msg_len;
	goto out;
#endif /* 0 */
}

/* This is an extended version of skb_pull() that removes the data from the
 * start of a skb even when data is spread across the list of skb's in the
 * frag_list. len specifies the total amount of data that needs to be removed.
 * when 'len' bytes could be removed from the skb, it returns 0.
 * If 'len' exceeds the total skb length,  it returns the no. of bytes that
 * could not be removed.
 */
static int sctp_skb_pull(struct sk_buff *skb, int len)
{
	struct sk_buff *list;
	int skb_len = skb_headlen(skb);
	int rlen;

	if (len <= skb_len) {
		__skb_pull(skb, len);
		return 0;
	}
	len -= skb_len;
	__skb_pull(skb, skb_len);

2132
	skb_walk_frags(skb, list) {
L
Linus Torvalds 已提交
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
		rlen = sctp_skb_pull(list, len);
		skb->len -= (len-rlen);
		skb->data_len -= (len-rlen);

		if (!rlen)
			return 0;

		len = rlen;
	}

	return len;
}

/* API 3.1.3  recvmsg() - UDP Style Syntax
 *
 *  ssize_t recvmsg(int socket, struct msghdr *message,
 *                    int flags);
 *
 *  socket  - the socket descriptor of the endpoint.
 *  message - pointer to the msghdr structure which contains a single
 *            user message and possibly some ancillary data.
 *
 *            See Section 5 for complete description of the data
 *            structures.
 *
 *  flags   - flags sent or received with the user message, see Section
 *            5 for complete description of the flags.
 */
2161 2162
static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
			int noblock, int flags, int *addr_len)
L
Linus Torvalds 已提交
2163 2164 2165
{
	struct sctp_ulpevent *event = NULL;
	struct sctp_sock *sp = sctp_sk(sk);
2166
	struct sk_buff *skb, *head_skb;
L
Linus Torvalds 已提交
2167 2168 2169 2170
	int copied;
	int err = 0;
	int skb_len;

2171 2172 2173
	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
		 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
		 addr_len);
L
Linus Torvalds 已提交
2174

2175
	lock_sock(sk);
L
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2176

2177
	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2178
	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
L
Linus Torvalds 已提交
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
		err = -ENOTCONN;
		goto out;
	}

	skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
		goto out;

	/* Get the total length of the skb including any skb's in the
	 * frag_list.
	 */
	skb_len = skb->len;

	copied = skb_len;
	if (copied > len)
		copied = len;

2196
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
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2197 2198 2199 2200 2201 2202

	event = sctp_skb2event(skb);

	if (err)
		goto out_free;

2203 2204 2205 2206 2207
	if (event->chunk && event->chunk->head_skb)
		head_skb = event->chunk->head_skb;
	else
		head_skb = skb;
	sock_recv_ts_and_drops(msg, sk, head_skb);
L
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2208 2209 2210 2211
	if (sctp_ulpevent_is_notification(event)) {
		msg->msg_flags |= MSG_NOTIFICATION;
		sp->pf->event_msgname(event, msg->msg_name, addr_len);
	} else {
2212
		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
L
Linus Torvalds 已提交
2213 2214
	}

2215 2216 2217
	/* Check if we allow SCTP_NXTINFO. */
	if (sp->recvnxtinfo)
		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2218 2219 2220
	/* Check if we allow SCTP_RCVINFO. */
	if (sp->recvrcvinfo)
		sctp_ulpevent_read_rcvinfo(event, msg);
L
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2221 2222 2223
	/* Check if we allow SCTP_SNDRCVINFO. */
	if (sp->subscribe.sctp_data_io_event)
		sctp_ulpevent_read_sndrcvinfo(event, msg);
2224

L
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2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
	err = copied;

	/* If skb's length exceeds the user's buffer, update the skb and
	 * push it back to the receive_queue so that the next call to
	 * recvmsg() will return the remaining data. Don't set MSG_EOR.
	 */
	if (skb_len > copied) {
		msg->msg_flags &= ~MSG_EOR;
		if (flags & MSG_PEEK)
			goto out_free;
		sctp_skb_pull(skb, copied);
		skb_queue_head(&sk->sk_receive_queue, skb);

2238 2239 2240 2241 2242 2243
		/* When only partial message is copied to the user, increase
		 * rwnd by that amount. If all the data in the skb is read,
		 * rwnd is updated when the event is freed.
		 */
		if (!sctp_ulpevent_is_notification(event))
			sctp_assoc_rwnd_increase(event->asoc, copied);
L
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2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
		goto out;
	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
		   (event->msg_flags & MSG_EOR))
		msg->msg_flags |= MSG_EOR;
	else
		msg->msg_flags &= ~MSG_EOR;

out_free:
	if (flags & MSG_PEEK) {
		/* Release the skb reference acquired after peeking the skb in
		 * sctp_skb_recv_datagram().
		 */
		kfree_skb(skb);
	} else {
		/* Free the event which includes releasing the reference to
		 * the owner of the skb, freeing the skb and updating the
		 * rwnd.
		 */
		sctp_ulpevent_free(event);
	}
out:
2265
	release_sock(sk);
L
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2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
	return err;
}

/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
 *
 * This option is a on/off flag.  If enabled no SCTP message
 * fragmentation will be performed.  Instead if a message being sent
 * exceeds the current PMTU size, the message will NOT be sent and
 * instead a error will be indicated to the user.
 */
static int sctp_setsockopt_disable_fragments(struct sock *sk,
2277 2278
					     char __user *optval,
					     unsigned int optlen)
L
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2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;

	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;

	return 0;
}

static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2294
				  unsigned int optlen)
L
Linus Torvalds 已提交
2295
{
2296 2297 2298
	struct sctp_association *asoc;
	struct sctp_ulpevent *event;

2299
	if (optlen > sizeof(struct sctp_event_subscribe))
L
Linus Torvalds 已提交
2300 2301 2302
		return -EINVAL;
	if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
		return -EFAULT;
2303

2304
	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2305 2306 2307 2308 2309 2310 2311 2312 2313
	 * if there is no data to be sent or retransmit, the stack will
	 * immediately send up this notification.
	 */
	if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
				       &sctp_sk(sk)->subscribe)) {
		asoc = sctp_id2assoc(sk, 0);

		if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
			event = sctp_ulpevent_make_sender_dry_event(asoc,
2314
					GFP_USER | __GFP_NOWARN);
2315 2316 2317
			if (!event)
				return -ENOMEM;

2318
			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2319 2320 2321
		}
	}

L
Linus Torvalds 已提交
2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336
	return 0;
}

/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
 *
 * This socket option is applicable to the UDP-style socket only.  When
 * set it will cause associations that are idle for more than the
 * specified number of seconds to automatically close.  An association
 * being idle is defined an association that has NOT sent or received
 * user data.  The special value of '0' indicates that no automatic
 * close of any associations should be performed.  The option expects an
 * integer defining the number of seconds of idle time before an
 * association is closed.
 */
static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2337
				     unsigned int optlen)
L
Linus Torvalds 已提交
2338 2339
{
	struct sctp_sock *sp = sctp_sk(sk);
2340
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2341 2342 2343 2344 2345 2346 2347 2348 2349

	/* Applicable to UDP-style socket only */
	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;
	if (optlen != sizeof(int))
		return -EINVAL;
	if (copy_from_user(&sp->autoclose, optval, optlen))
		return -EFAULT;

2350 2351 2352
	if (sp->autoclose > net->sctp.max_autoclose)
		sp->autoclose = net->sctp.max_autoclose;

L
Linus Torvalds 已提交
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365
	return 0;
}

/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
 *
 * Applications can enable or disable heartbeats for any peer address of
 * an association, modify an address's heartbeat interval, force a
 * heartbeat to be sent immediately, and adjust the address's maximum
 * number of retransmissions sent before an address is considered
 * unreachable.  The following structure is used to access and modify an
 * address's parameters:
 *
 *  struct sctp_paddrparams {
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
 *     sctp_assoc_t            spp_assoc_id;
 *     struct sockaddr_storage spp_address;
 *     uint32_t                spp_hbinterval;
 *     uint16_t                spp_pathmaxrxt;
 *     uint32_t                spp_pathmtu;
 *     uint32_t                spp_sackdelay;
 *     uint32_t                spp_flags;
 * };
 *
 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
 *                     application, and identifies the association for
 *                     this query.
L
Linus Torvalds 已提交
2378 2379
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2380 2381 2382
 *                     in milliseconds.  If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
L
Linus Torvalds 已提交
2383 2384
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422
 *                     considered unreachable. If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
 *   spp_pathmtu     - When Path MTU discovery is disabled the value
 *                     specified here will be the "fixed" path mtu.
 *                     Note that if the spp_address field is empty
 *                     then all associations on this address will
 *                     have this fixed path mtu set upon them.
 *
 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
 *                     the number of milliseconds that sacks will be delayed
 *                     for. This value will apply to all addresses of an
 *                     association if the spp_address field is empty. Note
 *                     also, that if delayed sack is enabled and this
 *                     value is set to 0, no change is made to the last
 *                     recorded delayed sack timer value.
 *
 *   spp_flags       - These flags are used to control various features
 *                     on an association. The flag field may contain
 *                     zero or more of the following options.
 *
 *                     SPP_HB_ENABLE  - Enable heartbeats on the
 *                     specified address. Note that if the address
 *                     field is empty all addresses for the association
 *                     have heartbeats enabled upon them.
 *
 *                     SPP_HB_DISABLE - Disable heartbeats on the
 *                     speicifed address. Note that if the address
 *                     field is empty all addresses for the association
 *                     will have their heartbeats disabled. Note also
 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
 *                     mutually exclusive, only one of these two should
 *                     be specified. Enabling both fields will have
 *                     undetermined results.
 *
 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
 *                     to be made immediately.
 *
2423 2424 2425 2426
 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
 *                     heartbeat delayis to be set to the value of 0
 *                     milliseconds.
 *
2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected.
 *
 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected. Not also that
 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
 *                     exclusive. Enabling both will have undetermined
 *                     results.
 *
 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
 *                     on delayed sack. The time specified in spp_sackdelay
 *                     is used to specify the sack delay for this address. Note
 *                     that if spp_address is empty then all addresses will
 *                     enable delayed sack and take on the sack delay
 *                     value specified in spp_sackdelay.
 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
 *                     off delayed sack. If the spp_address field is blank then
 *                     delayed sack is disabled for the entire association. Note
 *                     also that this field is mutually exclusive to
 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
 *                     results.
L
Linus Torvalds 已提交
2452
 */
A
Adrian Bunk 已提交
2453 2454 2455 2456 2457 2458 2459
static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
				       struct sctp_transport   *trans,
				       struct sctp_association *asoc,
				       struct sctp_sock        *sp,
				       int                      hb_change,
				       int                      pmtud_change,
				       int                      sackdelay_change)
2460 2461 2462 2463
{
	int error;

	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2464 2465 2466
		struct net *net = sock_net(trans->asoc->base.sk);

		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2467 2468 2469 2470
		if (error)
			return error;
	}

2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494
	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
	 * this field is ignored.  Note also that a value of zero indicates
	 * the current setting should be left unchanged.
	 */
	if (params->spp_flags & SPP_HB_ENABLE) {

		/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
		 * set.  This lets us use 0 value when this flag
		 * is set.
		 */
		if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
			params->spp_hbinterval = 0;

		if (params->spp_hbinterval ||
		    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
			if (trans) {
				trans->hbinterval =
				    msecs_to_jiffies(params->spp_hbinterval);
			} else if (asoc) {
				asoc->hbinterval =
				    msecs_to_jiffies(params->spp_hbinterval);
			} else {
				sp->hbinterval = params->spp_hbinterval;
			}
2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510
		}
	}

	if (hb_change) {
		if (trans) {
			trans->param_flags =
				(trans->param_flags & ~SPP_HB) | hb_change;
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_HB) | hb_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_HB) | hb_change;
		}
	}

2511 2512 2513 2514 2515 2516
	/* When Path MTU discovery is disabled the value specified here will
	 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
	 * include the flag SPP_PMTUD_DISABLE for this field to have any
	 * effect).
	 */
	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2517 2518
		if (trans) {
			trans->pathmtu = params->spp_pathmtu;
2519
			sctp_assoc_sync_pmtu(asoc);
2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
		} else if (asoc) {
			asoc->pathmtu = params->spp_pathmtu;
		} else {
			sp->pathmtu = params->spp_pathmtu;
		}
	}

	if (pmtud_change) {
		if (trans) {
			int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
				(params->spp_flags & SPP_PMTUD_ENABLE);
			trans->param_flags =
				(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
			if (update) {
2534
				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2535
				sctp_assoc_sync_pmtu(asoc);
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
			}
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
		}
	}

2546 2547 2548 2549 2550
	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
	 * value of this field is ignored.  Note also that a value of zero
	 * indicates the current setting should be left unchanged.
	 */
	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577
		if (trans) {
			trans->sackdelay =
				msecs_to_jiffies(params->spp_sackdelay);
		} else if (asoc) {
			asoc->sackdelay =
				msecs_to_jiffies(params->spp_sackdelay);
		} else {
			sp->sackdelay = params->spp_sackdelay;
		}
	}

	if (sackdelay_change) {
		if (trans) {
			trans->param_flags =
				(trans->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		}
	}

2578 2579
	/* Note that a value of zero indicates the current setting should be
	   left unchanged.
2580
	 */
2581
	if (params->spp_pathmaxrxt) {
2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593
		if (trans) {
			trans->pathmaxrxt = params->spp_pathmaxrxt;
		} else if (asoc) {
			asoc->pathmaxrxt = params->spp_pathmaxrxt;
		} else {
			sp->pathmaxrxt = params->spp_pathmaxrxt;
		}
	}

	return 0;
}

L
Linus Torvalds 已提交
2594
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2595 2596
					    char __user *optval,
					    unsigned int optlen)
L
Linus Torvalds 已提交
2597
{
2598 2599 2600 2601
	struct sctp_paddrparams  params;
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
2602
	int error;
2603
	int hb_change, pmtud_change, sackdelay_change;
L
Linus Torvalds 已提交
2604 2605

	if (optlen != sizeof(struct sctp_paddrparams))
2606
		return -EINVAL;
2607

L
Linus Torvalds 已提交
2608 2609 2610
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

2611 2612 2613 2614 2615 2616 2617 2618 2619
	/* Validate flags and value parameters. */
	hb_change        = params.spp_flags & SPP_HB;
	pmtud_change     = params.spp_flags & SPP_PMTUD;
	sackdelay_change = params.spp_flags & SPP_SACKDELAY;

	if (hb_change        == SPP_HB ||
	    pmtud_change     == SPP_PMTUD ||
	    sackdelay_change == SPP_SACKDELAY ||
	    params.spp_sackdelay > 500 ||
2620 2621
	    (params.spp_pathmtu &&
	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2622
		return -EINVAL;
L
Linus Torvalds 已提交
2623

2624 2625 2626
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
	 */
2627
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2628 2629 2630
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans)
L
Linus Torvalds 已提交
2631 2632 2633
			return -EINVAL;
	}

2634 2635 2636 2637 2638 2639
	/* Get association, if assoc_id != 0 and the socket is a one
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
	 */
	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
	if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
L
Linus Torvalds 已提交
2640 2641
		return -EINVAL;

2642 2643
	/* Heartbeat demand can only be sent on a transport or
	 * association, but not a socket.
L
Linus Torvalds 已提交
2644
	 */
2645 2646 2647 2648 2649 2650 2651
	if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
		return -EINVAL;

	/* Process parameters. */
	error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
					    hb_change, pmtud_change,
					    sackdelay_change);
L
Linus Torvalds 已提交
2652

2653 2654 2655 2656 2657
	if (error)
		return error;

	/* If changes are for association, also apply parameters to each
	 * transport.
L
Linus Torvalds 已提交
2658
	 */
2659
	if (!trans && asoc) {
2660 2661
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2662 2663 2664 2665 2666
			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
						    hb_change, pmtud_change,
						    sackdelay_change);
		}
	}
L
Linus Torvalds 已提交
2667 2668 2669 2670

	return 0;
}

2671 2672 2673 2674 2675 2676 2677 2678 2679 2680
static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
{
	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
}

static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
{
	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
}

2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714
/*
 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 *
 * This option will effect the way delayed acks are performed.  This
 * option allows you to get or set the delayed ack time, in
 * milliseconds.  It also allows changing the delayed ack frequency.
 * Changing the frequency to 1 disables the delayed sack algorithm.  If
 * the assoc_id is 0, then this sets or gets the endpoints default
 * values.  If the assoc_id field is non-zero, then the set or get
 * effects the specified association for the one to many model (the
 * assoc_id field is ignored by the one to one model).  Note that if
 * sack_delay or sack_freq are 0 when setting this option, then the
 * current values will remain unchanged.
 *
 * struct sctp_sack_info {
 *     sctp_assoc_t            sack_assoc_id;
 *     uint32_t                sack_delay;
 *     uint32_t                sack_freq;
 * };
 *
 * sack_assoc_id -  This parameter, indicates which association the user
 *    is performing an action upon.  Note that if this field's value is
 *    zero then the endpoints default value is changed (effecting future
 *    associations only).
 *
 * sack_delay -  This parameter contains the number of milliseconds that
 *    the user is requesting the delayed ACK timer be set to.  Note that
 *    this value is defined in the standard to be between 200 and 500
 *    milliseconds.
 *
 * sack_freq -  This parameter contains the number of packets that must
 *    be received before a sack is sent without waiting for the delay
 *    timer to expire.  The default value for this is 2, setting this
 *    value to 1 will disable the delayed sack algorithm.
2715 2716
 */

2717
static int sctp_setsockopt_delayed_ack(struct sock *sk,
2718
				       char __user *optval, unsigned int optlen)
2719
{
2720
	struct sctp_sack_info    params;
2721 2722 2723 2724
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

2725 2726 2727
	if (optlen == sizeof(struct sctp_sack_info)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
2728

2729 2730 2731
		if (params.sack_delay == 0 && params.sack_freq == 0)
			return 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2732
		pr_warn_ratelimited(DEPRECATED
2733
				    "%s (pid %d) "
2734
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2735 2736
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
2737 2738 2739 2740 2741 2742 2743 2744
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;

		if (params.sack_delay == 0)
			params.sack_freq = 1;
		else
			params.sack_freq = 0;
	} else
2745
		return -EINVAL;
2746 2747

	/* Validate value parameter. */
2748
	if (params.sack_delay > 500)
2749 2750
		return -EINVAL;

2751
	/* Get association, if sack_assoc_id != 0 and the socket is a one
2752 2753
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
2754
	 */
2755 2756
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2757 2758
		return -EINVAL;

2759
	if (params.sack_delay) {
2760 2761
		if (asoc) {
			asoc->sackdelay =
2762
				msecs_to_jiffies(params.sack_delay);
2763
			asoc->param_flags =
2764
				sctp_spp_sackdelay_enable(asoc->param_flags);
2765
		} else {
2766
			sp->sackdelay = params.sack_delay;
2767
			sp->param_flags =
2768
				sctp_spp_sackdelay_enable(sp->param_flags);
2769
		}
2770 2771 2772
	}

	if (params.sack_freq == 1) {
2773
		if (asoc) {
2774
			asoc->param_flags =
2775
				sctp_spp_sackdelay_disable(asoc->param_flags);
2776
		} else {
2777
			sp->param_flags =
2778
				sctp_spp_sackdelay_disable(sp->param_flags);
2779
		}
2780 2781 2782 2783
	} else if (params.sack_freq > 1) {
		if (asoc) {
			asoc->sackfreq = params.sack_freq;
			asoc->param_flags =
2784
				sctp_spp_sackdelay_enable(asoc->param_flags);
2785 2786 2787
		} else {
			sp->sackfreq = params.sack_freq;
			sp->param_flags =
2788
				sctp_spp_sackdelay_enable(sp->param_flags);
2789
		}
2790 2791 2792 2793
	}

	/* If change is for association, also apply to each transport. */
	if (asoc) {
2794 2795
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2796
			if (params.sack_delay) {
2797
				trans->sackdelay =
2798
					msecs_to_jiffies(params.sack_delay);
2799
				trans->param_flags =
2800
					sctp_spp_sackdelay_enable(trans->param_flags);
2801
			}
2802
			if (params.sack_freq == 1) {
2803
				trans->param_flags =
2804
					sctp_spp_sackdelay_disable(trans->param_flags);
2805 2806 2807
			} else if (params.sack_freq > 1) {
				trans->sackfreq = params.sack_freq;
				trans->param_flags =
2808
					sctp_spp_sackdelay_enable(trans->param_flags);
2809 2810 2811
			}
		}
	}
2812

2813 2814 2815
	return 0;
}

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2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
 *
 * Applications can specify protocol parameters for the default association
 * initialization.  The option name argument to setsockopt() and getsockopt()
 * is SCTP_INITMSG.
 *
 * Setting initialization parameters is effective only on an unconnected
 * socket (for UDP-style sockets only future associations are effected
 * by the change).  With TCP-style sockets, this option is inherited by
 * sockets derived from a listener socket.
 */
2827
static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
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2828 2829 2830 2831 2832 2833 2834 2835 2836 2837
{
	struct sctp_initmsg sinit;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen != sizeof(struct sctp_initmsg))
		return -EINVAL;
	if (copy_from_user(&sinit, optval, optlen))
		return -EFAULT;

	if (sinit.sinit_num_ostreams)
2838
		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
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Linus Torvalds 已提交
2839
	if (sinit.sinit_max_instreams)
2840
		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
L
Linus Torvalds 已提交
2841
	if (sinit.sinit_max_attempts)
2842
		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
L
Linus Torvalds 已提交
2843
	if (sinit.sinit_max_init_timeo)
2844
		sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
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2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863

	return 0;
}

/*
 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
 *
 *   Applications that wish to use the sendto() system call may wish to
 *   specify a default set of parameters that would normally be supplied
 *   through the inclusion of ancillary data.  This socket option allows
 *   such an application to set the default sctp_sndrcvinfo structure.
 *   The application that wishes to use this socket option simply passes
 *   in to this call the sctp_sndrcvinfo structure defined in Section
 *   5.2.2) The input parameters accepted by this call include
 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
 *   to this call if the caller is using the UDP model.
 */
static int sctp_setsockopt_default_send_param(struct sock *sk,
2864 2865
					      char __user *optval,
					      unsigned int optlen)
L
Linus Torvalds 已提交
2866 2867
{
	struct sctp_sock *sp = sctp_sk(sk);
2868 2869
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
2870

2871
	if (optlen != sizeof(info))
L
Linus Torvalds 已提交
2872 2873 2874
		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
2875 2876 2877 2878
	if (info.sinfo_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;
L
Linus Torvalds 已提交
2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899

	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		asoc->default_stream = info.sinfo_stream;
		asoc->default_flags = info.sinfo_flags;
		asoc->default_ppid = info.sinfo_ppid;
		asoc->default_context = info.sinfo_context;
		asoc->default_timetolive = info.sinfo_timetolive;
	} else {
		sp->default_stream = info.sinfo_stream;
		sp->default_flags = info.sinfo_flags;
		sp->default_ppid = info.sinfo_ppid;
		sp->default_context = info.sinfo_context;
		sp->default_timetolive = info.sinfo_timetolive;
	}

	return 0;
}

2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937
/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
 * (SCTP_DEFAULT_SNDINFO)
 */
static int sctp_setsockopt_default_sndinfo(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_sndinfo info;

	if (optlen != sizeof(info))
		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
	if (info.snd_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;

	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		asoc->default_stream = info.snd_sid;
		asoc->default_flags = info.snd_flags;
		asoc->default_ppid = info.snd_ppid;
		asoc->default_context = info.snd_context;
	} else {
		sp->default_stream = info.snd_sid;
		sp->default_flags = info.snd_flags;
		sp->default_ppid = info.snd_ppid;
		sp->default_context = info.snd_context;
	}

	return 0;
}

L
Linus Torvalds 已提交
2938 2939 2940 2941 2942 2943 2944
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 *
 * Requests that the local SCTP stack use the enclosed peer address as
 * the association primary.  The enclosed address must be one of the
 * association peer's addresses.
 */
static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2945
					unsigned int optlen)
L
Linus Torvalds 已提交
2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
{
	struct sctp_prim prim;
	struct sctp_transport *trans;

	if (optlen != sizeof(struct sctp_prim))
		return -EINVAL;

	if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
		return -EFAULT;

	trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
	if (!trans)
		return -EINVAL;

	sctp_assoc_set_primary(trans->asoc, trans);

	return 0;
}

/*
 * 7.1.5 SCTP_NODELAY
 *
 * Turn on/off any Nagle-like algorithm.  This means that packets are
 * generally sent as soon as possible and no unnecessary delays are
 * introduced, at the cost of more packets in the network.  Expects an
 *  integer boolean flag.
 */
static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2974
				   unsigned int optlen)
L
Linus Torvalds 已提交
2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
	return 0;
}

/*
 *
 * 7.1.1 SCTP_RTOINFO
 *
 * The protocol parameters used to initialize and bound retransmission
 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
 * and modify these parameters.
 * All parameters are time values, in milliseconds.  A value of 0, when
 * modifying the parameters, indicates that the current value should not
 * be changed.
 *
 */
2999 3000
static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
{
L
Linus Torvalds 已提交
3001 3002
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;
3003 3004
	unsigned long rto_min, rto_max;
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017

	if (optlen != sizeof (struct sctp_rtoinfo))
		return -EINVAL;

	if (copy_from_user(&rtoinfo, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);

	/* Set the values to the specific association */
	if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033
	rto_max = rtoinfo.srto_max;
	rto_min = rtoinfo.srto_min;

	if (rto_max)
		rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
	else
		rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;

	if (rto_min)
		rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
	else
		rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;

	if (rto_min > rto_max)
		return -EINVAL;

L
Linus Torvalds 已提交
3034 3035
	if (asoc) {
		if (rtoinfo.srto_initial != 0)
3036
			asoc->rto_initial =
L
Linus Torvalds 已提交
3037
				msecs_to_jiffies(rtoinfo.srto_initial);
3038 3039
		asoc->rto_max = rto_max;
		asoc->rto_min = rto_min;
L
Linus Torvalds 已提交
3040 3041 3042 3043 3044 3045
	} else {
		/* If there is no association or the association-id = 0
		 * set the values to the endpoint.
		 */
		if (rtoinfo.srto_initial != 0)
			sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3046 3047
		sp->rtoinfo.srto_max = rto_max;
		sp->rtoinfo.srto_min = rto_min;
L
Linus Torvalds 已提交
3048 3049 3050 3051 3052 3053 3054 3055 3056
	}

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
3057
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
3058 3059 3060 3061 3062 3063
 * of the association.
 * Returns an error if the new association retransmission value is
 * greater than the sum of the retransmission value  of the peer.
 * See [SCTP] for more information.
 *
 */
3064
static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081
{

	struct sctp_assocparams assocparams;
	struct sctp_association *asoc;

	if (optlen != sizeof(struct sctp_assocparams))
		return -EINVAL;
	if (copy_from_user(&assocparams, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);

	if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Set the values to the specific association */
	if (asoc) {
3082 3083 3084 3085 3086
		if (assocparams.sasoc_asocmaxrxt != 0) {
			__u32 path_sum = 0;
			int   paths = 0;
			struct sctp_transport *peer_addr;

3087 3088
			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
					transports) {
3089 3090 3091 3092
				path_sum += peer_addr->pathmaxrxt;
				paths++;
			}

3093
			/* Only validate asocmaxrxt if we have more than
3094 3095 3096 3097 3098 3099 3100 3101
			 * one path/transport.  We do this because path
			 * retransmissions are only counted when we have more
			 * then one path.
			 */
			if (paths > 1 &&
			    assocparams.sasoc_asocmaxrxt > path_sum)
				return -EINVAL;

L
Linus Torvalds 已提交
3102
			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3103 3104
		}

3105 3106
		if (assocparams.sasoc_cookie_life != 0)
			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
L
Linus Torvalds 已提交
3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130
	} else {
		/* Set the values to the endpoint */
		struct sctp_sock *sp = sctp_sk(sk);

		if (assocparams.sasoc_asocmaxrxt != 0)
			sp->assocparams.sasoc_asocmaxrxt =
						assocparams.sasoc_asocmaxrxt;
		if (assocparams.sasoc_cookie_life != 0)
			sp->assocparams.sasoc_cookie_life =
						assocparams.sasoc_cookie_life;
	}
	return 0;
}

/*
 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
 *
 * This socket option is a boolean flag which turns on or off mapped V4
 * addresses.  If this option is turned on and the socket is type
 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
 * If this option is turned off, then no mapping will be done of V4
 * addresses and a user will receive both PF_INET6 and PF_INET type
 * addresses on the socket.
 */
3131
static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;
	if (val)
		sp->v4mapped = 1;
	else
		sp->v4mapped = 0;

	return 0;
}

/*
3149 3150 3151
 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
 * This option will get or set the maximum size to put in any outgoing
 * SCTP DATA chunk.  If a message is larger than this size it will be
L
Linus Torvalds 已提交
3152 3153 3154
 * fragmented by SCTP into the specified size.  Note that the underlying
 * SCTP implementation may fragment into smaller sized chunks when the
 * PMTU of the underlying association is smaller than the value set by
3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173
 * the user.  The default value for this option is '0' which indicates
 * the user is NOT limiting fragmentation and only the PMTU will effect
 * SCTP's choice of DATA chunk size.  Note also that values set larger
 * than the maximum size of an IP datagram will effectively let SCTP
 * control fragmentation (i.e. the same as setting this option to 0).
 *
 * The following structure is used to access and modify this parameter:
 *
 * struct sctp_assoc_value {
 *   sctp_assoc_t assoc_id;
 *   uint32_t assoc_value;
 * };
 *
 * assoc_id:  This parameter is ignored for one-to-one style sockets.
 *    For one-to-many style sockets this parameter indicates which
 *    association the user is performing an action upon.  Note that if
 *    this field's value is zero then the endpoints default value is
 *    changed (effecting future associations only).
 * assoc_value:  This parameter specifies the maximum size in bytes.
L
Linus Torvalds 已提交
3174
 */
3175
static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3176
{
3177
	struct sctp_sock *sp = sctp_sk(sk);
3178
	struct sctp_assoc_value params;
L
Linus Torvalds 已提交
3179 3180 3181
	struct sctp_association *asoc;
	int val;

3182
	if (optlen == sizeof(int)) {
3183
		pr_warn_ratelimited(DEPRECATED
3184
				    "%s (pid %d) "
3185
				    "Use of int in maxseg socket option.\n"
3186 3187
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3188 3189 3190 3191 3192 3193 3194
		if (copy_from_user(&val, optval, optlen))
			return -EFAULT;
		params.assoc_id = 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
		val = params.assoc_value;
3195
	} else {
L
Linus Torvalds 已提交
3196
		return -EINVAL;
3197
	}
3198

3199 3200
	if (val) {
		int min_len, max_len;
L
Linus Torvalds 已提交
3201

3202 3203 3204 3205 3206
		min_len = SCTP_DEFAULT_MINSEGMENT - sp->pf->af->net_header_len;
		min_len -= sizeof(struct sctphdr) +
			   sizeof(struct sctp_data_chunk);

		max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
3207

3208 3209 3210 3211 3212
		if (val < min_len || val > max_len)
			return -EINVAL;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
3213 3214
	if (asoc) {
		if (val == 0) {
3215
			val = asoc->pathmtu - sp->pf->af->net_header_len;
3216
			val -= sizeof(struct sctphdr) +
3217
			       sctp_datachk_len(&asoc->stream);
3218
		}
3219 3220
		asoc->user_frag = val;
		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3221
	} else {
3222 3223
		if (params.assoc_id && sctp_style(sk, UDP))
			return -EINVAL;
3224
		sp->user_frag = val;
L
Linus Torvalds 已提交
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239
	}

	return 0;
}


/*
 *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 *
 *   Requests that the peer mark the enclosed address as the association
 *   primary. The enclosed address must be one of the association's
 *   locally bound addresses. The following structure is used to make a
 *   set primary request:
 */
static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3240
					     unsigned int optlen)
L
Linus Torvalds 已提交
3241
{
3242
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3243 3244 3245 3246
	struct sctp_sock	*sp;
	struct sctp_association	*asoc = NULL;
	struct sctp_setpeerprim	prim;
	struct sctp_chunk	*chunk;
3247
	struct sctp_af		*af;
L
Linus Torvalds 已提交
3248 3249 3250 3251
	int 			err;

	sp = sctp_sk(sk);

3252
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
3253 3254 3255 3256 3257 3258 3259 3260 3261
		return -EPERM;

	if (optlen != sizeof(struct sctp_setpeerprim))
		return -EINVAL;

	if (copy_from_user(&prim, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3262
	if (!asoc)
L
Linus Torvalds 已提交
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
		return -EINVAL;

	if (!asoc->peer.asconf_capable)
		return -EPERM;

	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
		return -EPERM;

	if (!sctp_state(asoc, ESTABLISHED))
		return -ENOTCONN;

3274 3275 3276 3277 3278 3279 3280
	af = sctp_get_af_specific(prim.sspp_addr.ss_family);
	if (!af)
		return -EINVAL;

	if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
		return -EADDRNOTAVAIL;

L
Linus Torvalds 已提交
3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291
	if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
		return -EADDRNOTAVAIL;

	/* Create an ASCONF chunk with SET_PRIMARY parameter	*/
	chunk = sctp_make_asconf_set_prim(asoc,
					  (union sctp_addr *)&prim.sspp_addr);
	if (!chunk)
		return -ENOMEM;

	err = sctp_send_asconf(asoc, chunk);

3292
	pr_debug("%s: we set peer primary addr primitively\n", __func__);
L
Linus Torvalds 已提交
3293 3294 3295 3296

	return err;
}

3297
static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3298
					    unsigned int optlen)
L
Linus Torvalds 已提交
3299
{
3300
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
3301

3302
	if (optlen != sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
3303
		return -EINVAL;
3304
	if (copy_from_user(&adaptation, optval, optlen))
L
Linus Torvalds 已提交
3305 3306
		return -EFAULT;

3307
	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
L
Linus Torvalds 已提交
3308 3309 3310 3311

	return 0;
}

3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326
/*
 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
 *
 * The context field in the sctp_sndrcvinfo structure is normally only
 * used when a failed message is retrieved holding the value that was
 * sent down on the actual send call.  This option allows the setting of
 * a default context on an association basis that will be received on
 * reading messages from the peer.  This is especially helpful in the
 * one-2-many model for an application to keep some reference to an
 * internal state machine that is processing messages on the
 * association.  Note that the setting of this value only effects
 * received messages from the peer and does not effect the value that is
 * saved with outbound messages.
 */
static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3327
				   unsigned int optlen)
3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351
{
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;

	if (optlen != sizeof(struct sctp_assoc_value))
		return -EINVAL;
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		asoc->default_rcv_context = params.assoc_value;
	} else {
		sp->default_rcv_context = params.assoc_value;
	}

	return 0;
}

3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
/*
 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
 *
 * This options will at a minimum specify if the implementation is doing
 * fragmented interleave.  Fragmented interleave, for a one to many
 * socket, is when subsequent calls to receive a message may return
 * parts of messages from different associations.  Some implementations
 * may allow you to turn this value on or off.  If so, when turned off,
 * no fragment interleave will occur (which will cause a head of line
 * blocking amongst multiple associations sharing the same one to many
 * socket).  When this option is turned on, then each receive call may
 * come from a different association (thus the user must receive data
 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
 * association each receive belongs to.
 *
 * This option takes a boolean value.  A non-zero value indicates that
 * fragmented interleave is on.  A value of zero indicates that
 * fragmented interleave is off.
 *
 * Note that it is important that an implementation that allows this
 * option to be turned on, have it off by default.  Otherwise an unaware
 * application using the one to many model may become confused and act
 * incorrectly.
 */
static int sctp_setsockopt_fragment_interleave(struct sock *sk,
					       char __user *optval,
3378
					       unsigned int optlen)
3379 3380 3381 3382 3383 3384 3385 3386
{
	int val;

	if (optlen != sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

3387 3388 3389 3390
	sctp_sk(sk)->frag_interleave = !!val;

	if (!sctp_sk(sk)->frag_interleave)
		sctp_sk(sk)->strm_interleave = 0;
3391 3392 3393 3394

	return 0;
}

3395
/*
3396
 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3397
 *       (SCTP_PARTIAL_DELIVERY_POINT)
3398
 *
3399 3400 3401
 * This option will set or get the SCTP partial delivery point.  This
 * point is the size of a message where the partial delivery API will be
 * invoked to help free up rwnd space for the peer.  Setting this to a
3402
 * lower value will cause partial deliveries to happen more often.  The
3403
 * calls argument is an integer that sets or gets the partial delivery
3404 3405 3406 3407 3408 3409 3410
 * point.  Note also that the call will fail if the user attempts to set
 * this value larger than the socket receive buffer size.
 *
 * Note that any single message having a length smaller than or equal to
 * the SCTP partial delivery point will be delivered in one single read
 * call as long as the user provided buffer is large enough to hold the
 * message.
3411 3412 3413
 */
static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
						  char __user *optval,
3414
						  unsigned int optlen)
3415 3416 3417 3418 3419 3420 3421 3422
{
	u32 val;

	if (optlen != sizeof(u32))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

3423 3424 3425 3426 3427 3428
	/* Note: We double the receive buffer from what the user sets
	 * it to be, also initial rwnd is based on rcvbuf/2.
	 */
	if (val > (sk->sk_rcvbuf >> 1))
		return -EINVAL;

3429 3430 3431 3432 3433
	sctp_sk(sk)->pd_point = val;

	return 0; /* is this the right error code? */
}

3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446
/*
 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
 *
 * This option will allow a user to change the maximum burst of packets
 * that can be emitted by this association.  Note that the default value
 * is 4, and some implementations may restrict this setting so that it
 * can only be lowered.
 *
 * NOTE: This text doesn't seem right.  Do this on a socket basis with
 * future associations inheriting the socket value.
 */
static int sctp_setsockopt_maxburst(struct sock *sk,
				    char __user *optval,
3447
				    unsigned int optlen)
3448
{
3449 3450 3451
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
3452
	int val;
3453
	int assoc_id = 0;
3454

3455
	if (optlen == sizeof(int)) {
3456
		pr_warn_ratelimited(DEPRECATED
3457
				    "%s (pid %d) "
3458
				    "Use of int in max_burst socket option deprecated.\n"
3459 3460
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3461 3462 3463 3464 3465 3466 3467 3468
		if (copy_from_user(&val, optval, optlen))
			return -EFAULT;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
		val = params.assoc_value;
		assoc_id = params.assoc_id;
	} else
3469 3470
		return -EINVAL;

3471 3472 3473 3474 3475 3476 3477 3478 3479
	sp = sctp_sk(sk);

	if (assoc_id != 0) {
		asoc = sctp_id2assoc(sk, assoc_id);
		if (!asoc)
			return -EINVAL;
		asoc->max_burst = val;
	} else
		sp->max_burst = val;
3480 3481 3482 3483

	return 0;
}

3484 3485 3486 3487 3488 3489 3490 3491
/*
 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 *
 * This set option adds a chunk type that the user is requesting to be
 * received only in an authenticated way.  Changes to the list of chunks
 * will only effect future associations on the socket.
 */
static int sctp_setsockopt_auth_chunk(struct sock *sk,
3492 3493
				      char __user *optval,
				      unsigned int optlen)
3494
{
3495
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3496 3497
	struct sctp_authchunk val;

3498
	if (!ep->auth_enable)
3499 3500
		return -EACCES;

3501 3502 3503 3504 3505 3506
	if (optlen != sizeof(struct sctp_authchunk))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	switch (val.sauth_chunk) {
J
Joe Perches 已提交
3507 3508 3509 3510 3511
	case SCTP_CID_INIT:
	case SCTP_CID_INIT_ACK:
	case SCTP_CID_SHUTDOWN_COMPLETE:
	case SCTP_CID_AUTH:
		return -EINVAL;
3512 3513 3514
	}

	/* add this chunk id to the endpoint */
3515
	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3516 3517 3518 3519 3520 3521 3522 3523 3524
}

/*
 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 *
 * This option gets or sets the list of HMAC algorithms that the local
 * endpoint requires the peer to use.
 */
static int sctp_setsockopt_hmac_ident(struct sock *sk,
3525 3526
				      char __user *optval,
				      unsigned int optlen)
3527
{
3528
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3529
	struct sctp_hmacalgo *hmacs;
3530
	u32 idents;
3531 3532
	int err;

3533
	if (!ep->auth_enable)
3534 3535
		return -EACCES;

3536 3537
	if (optlen < sizeof(struct sctp_hmacalgo))
		return -EINVAL;
3538 3539
	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
					     SCTP_AUTH_NUM_HMACS * sizeof(u16));
3540

3541
	hmacs = memdup_user(optval, optlen);
3542 3543
	if (IS_ERR(hmacs))
		return PTR_ERR(hmacs);
3544

3545 3546 3547
	idents = hmacs->shmac_num_idents;
	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3548 3549 3550 3551
		err = -EINVAL;
		goto out;
	}

3552
	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565
out:
	kfree(hmacs);
	return err;
}

/*
 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 *
 * This option will set a shared secret key which is used to build an
 * association shared key.
 */
static int sctp_setsockopt_auth_key(struct sock *sk,
				    char __user *optval,
3566
				    unsigned int optlen)
3567
{
3568
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3569 3570 3571 3572
	struct sctp_authkey *authkey;
	struct sctp_association *asoc;
	int ret;

3573
	if (!ep->auth_enable)
3574 3575
		return -EACCES;

3576 3577
	if (optlen <= sizeof(struct sctp_authkey))
		return -EINVAL;
3578 3579 3580 3581 3582
	/* authkey->sca_keylength is u16, so optlen can't be bigger than
	 * this.
	 */
	optlen = min_t(unsigned int, optlen, USHRT_MAX +
					     sizeof(struct sctp_authkey));
3583

3584
	authkey = memdup_user(optval, optlen);
3585 3586
	if (IS_ERR(authkey))
		return PTR_ERR(authkey);
3587

3588
	if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3589 3590 3591 3592
		ret = -EINVAL;
		goto out;
	}

3593 3594 3595 3596 3597 3598
	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
	if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
		ret = -EINVAL;
		goto out;
	}

3599
	ret = sctp_auth_set_key(ep, asoc, authkey);
3600
out:
3601
	kzfree(authkey);
3602 3603 3604 3605 3606 3607 3608 3609 3610 3611
	return ret;
}

/*
 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 *
 * This option will get or set the active shared key to be used to build
 * the association shared key.
 */
static int sctp_setsockopt_active_key(struct sock *sk,
3612 3613
				      char __user *optval,
				      unsigned int optlen)
3614
{
3615
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3616 3617 3618
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3619
	if (!ep->auth_enable)
3620 3621
		return -EACCES;

3622 3623 3624 3625 3626 3627 3628 3629 3630
	if (optlen != sizeof(struct sctp_authkeyid))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

3631
	return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3632 3633 3634 3635 3636 3637 3638 3639
}

/*
 * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
 *
 * This set option will delete a shared secret key from use.
 */
static int sctp_setsockopt_del_key(struct sock *sk,
3640 3641
				   char __user *optval,
				   unsigned int optlen)
3642
{
3643
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3644 3645 3646
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3647
	if (!ep->auth_enable)
3648 3649
		return -EACCES;

3650 3651 3652 3653 3654 3655 3656 3657 3658
	if (optlen != sizeof(struct sctp_authkeyid))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

3659
	return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3660 3661 3662

}

3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691
/*
 * 8.1.23 SCTP_AUTO_ASCONF
 *
 * This option will enable or disable the use of the automatic generation of
 * ASCONF chunks to add and delete addresses to an existing association.  Note
 * that this option has two caveats namely: a) it only affects sockets that
 * are bound to all addresses available to the SCTP stack, and b) the system
 * administrator may have an overriding control that turns the ASCONF feature
 * off no matter what setting the socket option may have.
 * This option expects an integer boolean flag, where a non-zero value turns on
 * the option, and a zero value turns off the option.
 * Note. In this implementation, socket operation overrides default parameter
 * being set by sysctl as well as FreeBSD implementation
 */
static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
					unsigned int optlen)
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;
	if (!sctp_is_ep_boundall(sk) && val)
		return -EINVAL;
	if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
		return 0;

3692
	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3693 3694 3695 3696 3697
	if (val == 0 && sp->do_auto_asconf) {
		list_del(&sp->auto_asconf_list);
		sp->do_auto_asconf = 0;
	} else if (val && !sp->do_auto_asconf) {
		list_add_tail(&sp->auto_asconf_list,
3698
		    &sock_net(sk)->sctp.auto_asconf_splist);
3699 3700
		sp->do_auto_asconf = 1;
	}
3701
	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3702 3703 3704
	return 0;
}

3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754
/*
 * SCTP_PEER_ADDR_THLDS
 *
 * This option allows us to alter the partially failed threshold for one or all
 * transports in an association.  See Section 6.1 of:
 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
 */
static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
					    char __user *optval,
					    unsigned int optlen)
{
	struct sctp_paddrthlds val;
	struct sctp_transport *trans;
	struct sctp_association *asoc;

	if (optlen < sizeof(struct sctp_paddrthlds))
		return -EINVAL;
	if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
			   sizeof(struct sctp_paddrthlds)))
		return -EFAULT;


	if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
		asoc = sctp_id2assoc(sk, val.spt_assoc_id);
		if (!asoc)
			return -ENOENT;
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				    transports) {
			if (val.spt_pathmaxrxt)
				trans->pathmaxrxt = val.spt_pathmaxrxt;
			trans->pf_retrans = val.spt_pathpfthld;
		}

		if (val.spt_pathmaxrxt)
			asoc->pathmaxrxt = val.spt_pathmaxrxt;
		asoc->pf_retrans = val.spt_pathpfthld;
	} else {
		trans = sctp_addr_id2transport(sk, &val.spt_address,
					       val.spt_assoc_id);
		if (!trans)
			return -ENOENT;

		if (val.spt_pathmaxrxt)
			trans->pathmaxrxt = val.spt_pathmaxrxt;
		trans->pf_retrans = val.spt_pathpfthld;
	}

	return 0;
}

3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770
static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *) optval))
		return -EFAULT;

	sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;

	return 0;
}

3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786
static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *) optval))
		return -EFAULT;

	sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;

	return 0;
}

3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819
static int sctp_setsockopt_pr_supported(struct sock *sk,
					char __user *optval,
					unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->prsctp_enable = !!params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->prsctp_enable = !!params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
static int sctp_setsockopt_default_prinfo(struct sock *sk,
					  char __user *optval,
					  unsigned int optlen)
{
	struct sctp_default_prinfo info;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(info))
		goto out;

	if (copy_from_user(&info, optval, sizeof(info))) {
		retval = -EFAULT;
		goto out;
	}

	if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	if (info.pr_policy == SCTP_PR_SCTP_NONE)
		info.pr_value = 0;

	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
	if (asoc) {
		SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
		asoc->default_timetolive = info.pr_value;
	} else if (!info.pr_assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
		sp->default_timetolive = info.pr_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893
static int sctp_setsockopt_reconfig_supported(struct sock *sk,
					      char __user *optval,
					      unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->reconf_enable = !!params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->reconf_enable = !!params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929
static int sctp_setsockopt_enable_strreset(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->strreset_enable = params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->strreset_enable = params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3930 3931 3932 3933 3934 3935 3936 3937
static int sctp_setsockopt_reset_streams(struct sock *sk,
					 char __user *optval,
					 unsigned int optlen)
{
	struct sctp_reset_streams *params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

3938
	if (optlen < sizeof(*params))
3939
		return -EINVAL;
3940 3941 3942
	/* srs_number_streams is u16, so optlen can't be bigger than this. */
	optlen = min_t(unsigned int, optlen, USHRT_MAX +
					     sizeof(__u16) * sizeof(*params));
3943 3944 3945 3946 3947

	params = memdup_user(optval, optlen);
	if (IS_ERR(params))
		return PTR_ERR(params);

3948 3949 3950 3951
	if (params->srs_number_streams * sizeof(__u16) >
	    optlen - sizeof(*params))
		goto out;

3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_streams(asoc, params);

out:
	kfree(params);
	return retval;
}

3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988
static int sctp_setsockopt_reset_assoc(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	struct sctp_association *asoc;
	sctp_assoc_t associd;
	int retval = -EINVAL;

	if (optlen != sizeof(associd))
		goto out;

	if (copy_from_user(&associd, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, associd);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_assoc(asoc);

out:
	return retval;
}

3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014
static int sctp_setsockopt_add_streams(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_add_streams params;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.sas_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_add_streams(asoc, &params);

out:
	return retval;
}

4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044
static int sctp_setsockopt_scheduler(struct sock *sk,
				     char __user *optval,
				     unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_assoc_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_value > SCTP_SS_MAX)
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_sched_set_sched(asoc, params.assoc_value);

out:
	return retval;
}

4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072
static int sctp_setsockopt_scheduler_value(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_stream_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_sched_set_value(asoc, params.stream_id,
				      params.stream_value, GFP_KERNEL);

out:
	return retval;
}

4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106
static int sctp_setsockopt_interleaving_supported(struct sock *sk,
						  char __user *optval,
						  unsigned int optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct net *net = sock_net(sk);
	struct sctp_assoc_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_id)
		goto out;

	if (!net->sctp.intl_enable || !sp->frag_interleave) {
		retval = -EPERM;
		goto out;
	}

	sp->strm_interleave = !!params.assoc_value;

	retval = 0;

out:
	return retval;
}

L
Linus Torvalds 已提交
4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125
/* API 6.2 setsockopt(), getsockopt()
 *
 * Applications use setsockopt() and getsockopt() to set or retrieve
 * socket options.  Socket options are used to change the default
 * behavior of sockets calls.  They are described in Section 7.
 *
 * The syntax is:
 *
 *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
 *                    int __user *optlen);
 *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
 *                    int optlen);
 *
 *   sd      - the socket descript.
 *   level   - set to IPPROTO_SCTP for all SCTP options.
 *   optname - the option name.
 *   optval  - the buffer to store the value of the option.
 *   optlen  - the size of the buffer.
 */
4126 4127
static int sctp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
4128 4129 4130
{
	int retval = 0;

4131
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144

	/* I can hardly begin to describe how wrong this is.  This is
	 * so broken as to be worse than useless.  The API draft
	 * REALLY is NOT helpful here...  I am not convinced that the
	 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
	 * are at all well-founded.
	 */
	if (level != SOL_SCTP) {
		struct sctp_af *af = sctp_sk(sk)->pf->af;
		retval = af->setsockopt(sk, level, optname, optval, optlen);
		goto out_nounlock;
	}

4145
	lock_sock(sk);
L
Linus Torvalds 已提交
4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159

	switch (optname) {
	case SCTP_SOCKOPT_BINDX_ADD:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
					       optlen, SCTP_BINDX_ADD_ADDR);
		break;

	case SCTP_SOCKOPT_BINDX_REM:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
					       optlen, SCTP_BINDX_REM_ADDR);
		break;

4160 4161 4162 4163 4164 4165 4166
	case SCTP_SOCKOPT_CONNECTX_OLD:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_connectx_old(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
		break;

F
Frank Filz 已提交
4167 4168
	case SCTP_SOCKOPT_CONNECTX:
		/* 'optlen' is the size of the addresses buffer. */
4169 4170 4171
		retval = sctp_setsockopt_connectx(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
F
Frank Filz 已提交
4172 4173
		break;

L
Linus Torvalds 已提交
4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189
	case SCTP_DISABLE_FRAGMENTS:
		retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
		break;

	case SCTP_EVENTS:
		retval = sctp_setsockopt_events(sk, optval, optlen);
		break;

	case SCTP_AUTOCLOSE:
		retval = sctp_setsockopt_autoclose(sk, optval, optlen);
		break;

	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
		break;

4190
	case SCTP_DELAYED_SACK:
4191
		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4192
		break;
4193 4194 4195
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
		break;
4196

L
Linus Torvalds 已提交
4197 4198 4199 4200 4201 4202 4203
	case SCTP_INITMSG:
		retval = sctp_setsockopt_initmsg(sk, optval, optlen);
		break;
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_setsockopt_default_send_param(sk, optval,
							    optlen);
		break;
4204 4205 4206
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227
	case SCTP_PRIMARY_ADDR:
		retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
		break;
	case SCTP_SET_PEER_PRIMARY_ADDR:
		retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
		break;
	case SCTP_NODELAY:
		retval = sctp_setsockopt_nodelay(sk, optval, optlen);
		break;
	case SCTP_RTOINFO:
		retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
		break;
	case SCTP_ASSOCINFO:
		retval = sctp_setsockopt_associnfo(sk, optval, optlen);
		break;
	case SCTP_I_WANT_MAPPED_V4_ADDR:
		retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
		break;
	case SCTP_MAXSEG:
		retval = sctp_setsockopt_maxseg(sk, optval, optlen);
		break;
4228 4229
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
L
Linus Torvalds 已提交
4230
		break;
4231 4232 4233
	case SCTP_CONTEXT:
		retval = sctp_setsockopt_context(sk, optval, optlen);
		break;
4234 4235 4236
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
		break;
4237 4238 4239
	case SCTP_MAX_BURST:
		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
		break;
4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254
	case SCTP_AUTH_CHUNK:
		retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
		break;
	case SCTP_HMAC_IDENT:
		retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
		break;
	case SCTP_AUTH_KEY:
		retval = sctp_setsockopt_auth_key(sk, optval, optlen);
		break;
	case SCTP_AUTH_ACTIVE_KEY:
		retval = sctp_setsockopt_active_key(sk, optval, optlen);
		break;
	case SCTP_AUTH_DELETE_KEY:
		retval = sctp_setsockopt_del_key(sk, optval, optlen);
		break;
4255 4256 4257
	case SCTP_AUTO_ASCONF:
		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
		break;
4258 4259 4260
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
		break;
4261 4262 4263
	case SCTP_RECVRCVINFO:
		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
		break;
4264 4265 4266
	case SCTP_RECVNXTINFO:
		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
		break;
4267 4268 4269
	case SCTP_PR_SUPPORTED:
		retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
		break;
4270 4271 4272
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
		break;
4273 4274 4275
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
		break;
4276 4277 4278
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
		break;
4279 4280 4281
	case SCTP_RESET_STREAMS:
		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
		break;
4282 4283 4284
	case SCTP_RESET_ASSOC:
		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
		break;
4285 4286 4287
	case SCTP_ADD_STREAMS:
		retval = sctp_setsockopt_add_streams(sk, optval, optlen);
		break;
4288 4289 4290
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_setsockopt_scheduler(sk, optval, optlen);
		break;
4291 4292 4293
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
		break;
4294 4295 4296 4297
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_setsockopt_interleaving_supported(sk, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
4298 4299 4300
	default:
		retval = -ENOPROTOOPT;
		break;
4301
	}
L
Linus Torvalds 已提交
4302

4303
	release_sock(sk);
L
Linus Torvalds 已提交
4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324

out_nounlock:
	return retval;
}

/* API 3.1.6 connect() - UDP Style Syntax
 *
 * An application may use the connect() call in the UDP model to initiate an
 * association without sending data.
 *
 * The syntax is:
 *
 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
 *
 * sd: the socket descriptor to have a new association added to.
 *
 * nam: the address structure (either struct sockaddr_in or struct
 *    sockaddr_in6 defined in RFC2553 [7]).
 *
 * len: the size of the address.
 */
4325 4326
static int sctp_connect(struct sock *sk, struct sockaddr *addr,
			int addr_len)
L
Linus Torvalds 已提交
4327 4328
{
	int err = 0;
F
Frank Filz 已提交
4329
	struct sctp_af *af;
L
Linus Torvalds 已提交
4330

4331
	lock_sock(sk);
L
Linus Torvalds 已提交
4332

4333 4334
	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
4335

F
Frank Filz 已提交
4336 4337 4338 4339 4340 4341 4342 4343
	/* Validate addr_len before calling common connect/connectx routine. */
	af = sctp_get_af_specific(addr->sa_family);
	if (!af || addr_len < af->sockaddr_len) {
		err = -EINVAL;
	} else {
		/* Pass correct addr len to common routine (so it knows there
		 * is only one address being passed.
		 */
4344
		err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
L
Linus Torvalds 已提交
4345 4346
	}

4347
	release_sock(sk);
L
Linus Torvalds 已提交
4348 4349 4350 4351
	return err;
}

/* FIXME: Write comments. */
4352
static int sctp_disconnect(struct sock *sk, int flags)
L
Linus Torvalds 已提交
4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363
{
	return -EOPNOTSUPP; /* STUB */
}

/* 4.1.4 accept() - TCP Style Syntax
 *
 * Applications use accept() call to remove an established SCTP
 * association from the accept queue of the endpoint.  A new socket
 * descriptor will be returned from accept() to represent the newly
 * formed association.
 */
4364
static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
L
Linus Torvalds 已提交
4365 4366 4367 4368 4369 4370 4371 4372
{
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sock *newsk = NULL;
	struct sctp_association *asoc;
	long timeo;
	int error = 0;

4373
	lock_sock(sk);
L
Linus Torvalds 已提交
4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387

	sp = sctp_sk(sk);
	ep = sp->ep;

	if (!sctp_style(sk, TCP)) {
		error = -EOPNOTSUPP;
		goto out;
	}

	if (!sctp_sstate(sk, LISTENING)) {
		error = -EINVAL;
		goto out;
	}

4388
	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
L
Linus Torvalds 已提交
4389 4390 4391 4392 4393 4394 4395 4396 4397 4398

	error = sctp_wait_for_accept(sk, timeo);
	if (error)
		goto out;

	/* We treat the list of associations on the endpoint as the accept
	 * queue and pick the first association on the list.
	 */
	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);

4399
	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
L
Linus Torvalds 已提交
4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410
	if (!newsk) {
		error = -ENOMEM;
		goto out;
	}

	/* Populate the fields of the newsk from the oldsk and migrate the
	 * asoc to the newsk.
	 */
	sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);

out:
4411
	release_sock(sk);
4412
	*err = error;
L
Linus Torvalds 已提交
4413 4414 4415 4416
	return newsk;
}

/* The SCTP ioctl handler. */
4417
static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
L
Linus Torvalds 已提交
4418
{
4419 4420
	int rc = -ENOTCONN;

4421
	lock_sock(sk);
4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444

	/*
	 * SEQPACKET-style sockets in LISTENING state are valid, for
	 * SCTP, so only discard TCP-style sockets in LISTENING state.
	 */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
		goto out;

	switch (cmd) {
	case SIOCINQ: {
		struct sk_buff *skb;
		unsigned int amount = 0;

		skb = skb_peek(&sk->sk_receive_queue);
		if (skb != NULL) {
			/*
			 * We will only return the amount of this packet since
			 * that is all that will be read.
			 */
			amount = skb->len;
		}
		rc = put_user(amount, (int __user *)arg);
		break;
4445
	}
4446 4447 4448 4449 4450
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
4451
	release_sock(sk);
4452
	return rc;
L
Linus Torvalds 已提交
4453 4454 4455 4456 4457 4458
}

/* This is the function which gets called during socket creation to
 * initialized the SCTP-specific portion of the sock.
 * The sock structure should already be zero-filled memory.
 */
4459
static int sctp_init_sock(struct sock *sk)
L
Linus Torvalds 已提交
4460
{
4461
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4462 4463
	struct sctp_sock *sp;

4464
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479

	sp = sctp_sk(sk);

	/* Initialize the SCTP per socket area.  */
	switch (sk->sk_type) {
	case SOCK_SEQPACKET:
		sp->type = SCTP_SOCKET_UDP;
		break;
	case SOCK_STREAM:
		sp->type = SCTP_SOCKET_TCP;
		break;
	default:
		return -ESOCKTNOSUPPORT;
	}

M
Marcelo Ricardo Leitner 已提交
4480 4481
	sk->sk_gso_type = SKB_GSO_SCTP;

L
Linus Torvalds 已提交
4482 4483 4484 4485 4486 4487 4488 4489 4490
	/* Initialize default send parameters. These parameters can be
	 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
	 */
	sp->default_stream = 0;
	sp->default_ppid = 0;
	sp->default_flags = 0;
	sp->default_context = 0;
	sp->default_timetolive = 0;

4491
	sp->default_rcv_context = 0;
4492
	sp->max_burst = net->sctp.max_burst;
4493

4494 4495
	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;

L
Linus Torvalds 已提交
4496 4497 4498 4499 4500 4501
	/* Initialize default setup parameters. These parameters
	 * can be modified with the SCTP_INITMSG socket option or
	 * overridden by the SCTP_INIT CMSG.
	 */
	sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
	sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4502 4503
	sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
L
Linus Torvalds 已提交
4504 4505 4506 4507

	/* Initialize default RTO related parameters.  These parameters can
	 * be modified for with the SCTP_RTOINFO socket option.
	 */
4508 4509 4510
	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
	sp->rtoinfo.srto_max     = net->sctp.rto_max;
	sp->rtoinfo.srto_min     = net->sctp.rto_min;
L
Linus Torvalds 已提交
4511 4512 4513 4514

	/* Initialize default association related parameters. These parameters
	 * can be modified with the SCTP_ASSOCINFO socket option.
	 */
4515
	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
L
Linus Torvalds 已提交
4516 4517 4518
	sp->assocparams.sasoc_number_peer_destinations = 0;
	sp->assocparams.sasoc_peer_rwnd = 0;
	sp->assocparams.sasoc_local_rwnd = 0;
4519
	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
L
Linus Torvalds 已提交
4520 4521

	/* Initialize default event subscriptions. By default, all the
4522
	 * options are off.
L
Linus Torvalds 已提交
4523 4524 4525 4526 4527 4528
	 */
	memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));

	/* Default Peer Address Parameters.  These defaults can
	 * be modified via SCTP_PEER_ADDR_PARAMS
	 */
4529 4530
	sp->hbinterval  = net->sctp.hb_interval;
	sp->pathmaxrxt  = net->sctp.max_retrans_path;
4531
	sp->pathmtu     = 0; /* allow default discovery */
4532
	sp->sackdelay   = net->sctp.sack_timeout;
4533
	sp->sackfreq	= 2;
4534
	sp->param_flags = SPP_HB_ENABLE |
4535 4536
			  SPP_PMTUD_ENABLE |
			  SPP_SACKDELAY_ENABLE;
L
Linus Torvalds 已提交
4537 4538 4539 4540 4541 4542

	/* If enabled no SCTP message fragmentation will be performed.
	 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
	 */
	sp->disable_fragments = 0;

4543 4544
	/* Enable Nagle algorithm by default.  */
	sp->nodelay           = 0;
L
Linus Torvalds 已提交
4545

4546
	sp->recvrcvinfo = 0;
4547
	sp->recvnxtinfo = 0;
4548

L
Linus Torvalds 已提交
4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561
	/* Enable by default. */
	sp->v4mapped          = 1;

	/* Auto-close idle associations after the configured
	 * number of seconds.  A value of 0 disables this
	 * feature.  Configure through the SCTP_AUTOCLOSE socket option,
	 * for UDP-style sockets only.
	 */
	sp->autoclose         = 0;

	/* User specified fragmentation limit. */
	sp->user_frag         = 0;

4562
	sp->adaptation_ind = 0;
L
Linus Torvalds 已提交
4563 4564 4565 4566

	sp->pf = sctp_get_pf_specific(sk->sk_family);

	/* Control variables for partial data delivery. */
4567
	atomic_set(&sp->pd_mode, 0);
L
Linus Torvalds 已提交
4568
	skb_queue_head_init(&sp->pd_lobby);
4569
	sp->frag_interleave = 0;
L
Linus Torvalds 已提交
4570 4571 4572 4573 4574

	/* Create a per socket endpoint structure.  Even if we
	 * change the data structure relationships, this may still
	 * be useful for storing pre-connect address information.
	 */
4575 4576
	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
	if (!sp->ep)
L
Linus Torvalds 已提交
4577 4578 4579 4580
		return -ENOMEM;

	sp->hmac = NULL;

4581 4582
	sk->sk_destruct = sctp_destruct_sock;

L
Linus Torvalds 已提交
4583
	SCTP_DBG_OBJCNT_INC(sock);
4584 4585

	local_bh_disable();
4586
	sk_sockets_allocated_inc(sk);
4587
	sock_prot_inuse_add(net, sk->sk_prot, 1);
4588 4589 4590 4591

	/* Nothing can fail after this block, otherwise
	 * sctp_destroy_sock() will be called without addr_wq_lock held
	 */
4592
	if (net->sctp.default_auto_asconf) {
4593
		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4594
		list_add_tail(&sp->auto_asconf_list,
4595
		    &net->sctp.auto_asconf_splist);
4596
		sp->do_auto_asconf = 1;
4597 4598
		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
	} else {
4599
		sp->do_auto_asconf = 0;
4600 4601
	}

4602 4603
	local_bh_enable();

L
Linus Torvalds 已提交
4604 4605 4606
	return 0;
}

4607 4608 4609
/* Cleanup any SCTP per socket resources. Must be called with
 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
 */
4610
static void sctp_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
4611
{
4612
	struct sctp_sock *sp;
L
Linus Torvalds 已提交
4613

4614
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4615 4616

	/* Release our hold on the endpoint. */
4617
	sp = sctp_sk(sk);
4618 4619 4620 4621 4622 4623
	/* This could happen during socket init, thus we bail out
	 * early, since the rest of the below is not setup either.
	 */
	if (sp->ep == NULL)
		return;

4624 4625 4626 4627 4628
	if (sp->do_auto_asconf) {
		sp->do_auto_asconf = 0;
		list_del(&sp->auto_asconf_list);
	}
	sctp_endpoint_free(sp->ep);
4629
	local_bh_disable();
4630
	sk_sockets_allocated_dec(sk);
4631
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4632
	local_bh_enable();
L
Linus Torvalds 已提交
4633 4634
}

4635 4636 4637 4638 4639 4640
/* Triggered when there are no references on the socket anymore */
static void sctp_destruct_sock(struct sock *sk)
{
	struct sctp_sock *sp = sctp_sk(sk);

	/* Free up the HMAC transform. */
H
Herbert Xu 已提交
4641
	crypto_free_shash(sp->hmac);
4642 4643 4644 4645

	inet_sock_destruct(sk);
}

L
Linus Torvalds 已提交
4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661
/* API 4.1.7 shutdown() - TCP Style Syntax
 *     int shutdown(int socket, int how);
 *
 *     sd      - the socket descriptor of the association to be closed.
 *     how     - Specifies the type of shutdown.  The  values  are
 *               as follows:
 *               SHUT_RD
 *                     Disables further receive operations. No SCTP
 *                     protocol action is taken.
 *               SHUT_WR
 *                     Disables further send operations, and initiates
 *                     the SCTP shutdown sequence.
 *               SHUT_RDWR
 *                     Disables further send  and  receive  operations
 *                     and initiates the SCTP shutdown sequence.
 */
4662
static void sctp_shutdown(struct sock *sk, int how)
L
Linus Torvalds 已提交
4663
{
4664
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4665 4666 4667 4668 4669
	struct sctp_endpoint *ep;

	if (!sctp_style(sk, TCP))
		return;

4670 4671 4672 4673
	ep = sctp_sk(sk)->ep;
	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
		struct sctp_association *asoc;

4674
		inet_sk_set_state(sk, SCTP_SS_CLOSING);
4675 4676 4677
		asoc = list_entry(ep->asocs.next,
				  struct sctp_association, asocs);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
4678 4679 4680
	}
}

4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
		       struct sctp_info *info)
{
	struct sctp_transport *prim;
	struct list_head *pos;
	int mask;

	memset(info, 0, sizeof(*info));
	if (!asoc) {
		struct sctp_sock *sp = sctp_sk(sk);

		info->sctpi_s_autoclose = sp->autoclose;
		info->sctpi_s_adaptation_ind = sp->adaptation_ind;
		info->sctpi_s_pd_point = sp->pd_point;
		info->sctpi_s_nodelay = sp->nodelay;
		info->sctpi_s_disable_fragments = sp->disable_fragments;
		info->sctpi_s_v4mapped = sp->v4mapped;
		info->sctpi_s_frag_interleave = sp->frag_interleave;
4699
		info->sctpi_s_type = sp->type;
4700 4701 4702 4703 4704 4705 4706 4707 4708

		return 0;
	}

	info->sctpi_tag = asoc->c.my_vtag;
	info->sctpi_state = asoc->state;
	info->sctpi_rwnd = asoc->a_rwnd;
	info->sctpi_unackdata = asoc->unack_data;
	info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4709 4710
	info->sctpi_instrms = asoc->stream.incnt;
	info->sctpi_outstrms = asoc->stream.outcnt;
4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749
	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
		info->sctpi_inqueue++;
	list_for_each(pos, &asoc->outqueue.out_chunk_list)
		info->sctpi_outqueue++;
	info->sctpi_overall_error = asoc->overall_error_count;
	info->sctpi_max_burst = asoc->max_burst;
	info->sctpi_maxseg = asoc->frag_point;
	info->sctpi_peer_rwnd = asoc->peer.rwnd;
	info->sctpi_peer_tag = asoc->c.peer_vtag;

	mask = asoc->peer.ecn_capable << 1;
	mask = (mask | asoc->peer.ipv4_address) << 1;
	mask = (mask | asoc->peer.ipv6_address) << 1;
	mask = (mask | asoc->peer.hostname_address) << 1;
	mask = (mask | asoc->peer.asconf_capable) << 1;
	mask = (mask | asoc->peer.prsctp_capable) << 1;
	mask = (mask | asoc->peer.auth_capable);
	info->sctpi_peer_capable = mask;
	mask = asoc->peer.sack_needed << 1;
	mask = (mask | asoc->peer.sack_generation) << 1;
	mask = (mask | asoc->peer.zero_window_announced);
	info->sctpi_peer_sack = mask;

	info->sctpi_isacks = asoc->stats.isacks;
	info->sctpi_osacks = asoc->stats.osacks;
	info->sctpi_opackets = asoc->stats.opackets;
	info->sctpi_ipackets = asoc->stats.ipackets;
	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
	info->sctpi_idupchunks = asoc->stats.idupchunks;
	info->sctpi_gapcnt = asoc->stats.gapcnt;
	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
	info->sctpi_oodchunks = asoc->stats.oodchunks;
	info->sctpi_iodchunks = asoc->stats.iodchunks;
	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;

	prim = asoc->peer.primary_path;
4750
	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766
	info->sctpi_p_state = prim->state;
	info->sctpi_p_cwnd = prim->cwnd;
	info->sctpi_p_srtt = prim->srtt;
	info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
	info->sctpi_p_hbinterval = prim->hbinterval;
	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
	info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
	info->sctpi_p_ssthresh = prim->ssthresh;
	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
	info->sctpi_p_flight_size = prim->flight_size;
	info->sctpi_p_error = prim->error_count;

	return 0;
}
EXPORT_SYMBOL_GPL(sctp_get_sctp_info);

4767
/* use callback to avoid exporting the core structure */
4768
void sctp_transport_walk_start(struct rhashtable_iter *iter)
4769
{
4770
	rhltable_walk_enter(&sctp_transport_hashtable, iter);
4771

4772
	rhashtable_walk_start(iter);
4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823
}

void sctp_transport_walk_stop(struct rhashtable_iter *iter)
{
	rhashtable_walk_stop(iter);
	rhashtable_walk_exit(iter);
}

struct sctp_transport *sctp_transport_get_next(struct net *net,
					       struct rhashtable_iter *iter)
{
	struct sctp_transport *t;

	t = rhashtable_walk_next(iter);
	for (; t; t = rhashtable_walk_next(iter)) {
		if (IS_ERR(t)) {
			if (PTR_ERR(t) == -EAGAIN)
				continue;
			break;
		}

		if (net_eq(sock_net(t->asoc->base.sk), net) &&
		    t->asoc->peer.primary_path == t)
			break;
	}

	return t;
}

struct sctp_transport *sctp_transport_get_idx(struct net *net,
					      struct rhashtable_iter *iter,
					      int pos)
{
	void *obj = SEQ_START_TOKEN;

	while (pos && (obj = sctp_transport_get_next(net, iter)) &&
	       !IS_ERR(obj))
		pos--;

	return obj;
}

int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
			   void *p) {
	int err = 0;
	int hash = 0;
	struct sctp_ep_common *epb;
	struct sctp_hashbucket *head;

	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
	     hash++, head++) {
4824
		read_lock_bh(&head->lock);
4825 4826 4827 4828 4829
		sctp_for_each_hentry(epb, &head->chain) {
			err = cb(sctp_ep(epb), p);
			if (err)
				break;
		}
4830
		read_unlock_bh(&head->lock);
4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842
	}

	return err;
}
EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);

int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
				  struct net *net,
				  const union sctp_addr *laddr,
				  const union sctp_addr *paddr, void *p)
{
	struct sctp_transport *transport;
4843
	int err;
4844 4845 4846

	rcu_read_lock();
	transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4847
	rcu_read_unlock();
4848
	if (!transport)
4849
		return -ENOENT;
4850 4851

	err = cb(transport, p);
4852
	sctp_transport_put(transport);
4853

4854 4855 4856 4857 4858
	return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);

int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4859 4860
			    int (*cb_done)(struct sctp_transport *, void *),
			    struct net *net, int *pos, void *p) {
4861
	struct rhashtable_iter hti;
4862
	struct sctp_transport *tsp;
4863
	int ret = 0;
4864

4865
again:
4866
	sctp_transport_walk_start(&hti);
4867

4868 4869 4870
	tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
	for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
		if (!sctp_transport_hold(tsp))
4871
			continue;
4872 4873
		ret = cb(tsp, p);
		if (ret)
4874
			break;
4875 4876
		(*pos)++;
		sctp_transport_put(tsp);
4877 4878
	}
	sctp_transport_walk_stop(&hti);
4879

4880 4881 4882 4883 4884 4885 4886 4887 4888 4889
	if (ret) {
		if (cb_done && !cb_done(tsp, p)) {
			(*pos)++;
			sctp_transport_put(tsp);
			goto again;
		}
		sctp_transport_put(tsp);
	}

	return ret;
4890 4891 4892
}
EXPORT_SYMBOL_GPL(sctp_for_each_transport);

L
Linus Torvalds 已提交
4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909
/* 7.2.1 Association Status (SCTP_STATUS)

 * Applications can retrieve current status information about an
 * association, including association state, peer receiver window size,
 * number of unacked data chunks, and number of data chunks pending
 * receipt.  This information is read-only.
 */
static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
				       char __user *optval,
				       int __user *optlen)
{
	struct sctp_status status;
	struct sctp_association *asoc = NULL;
	struct sctp_transport *transport;
	sctp_assoc_t associd;
	int retval = 0;

4910
	if (len < sizeof(status)) {
L
Linus Torvalds 已提交
4911 4912 4913 4914
		retval = -EINVAL;
		goto out;
	}

4915 4916
	len = sizeof(status);
	if (copy_from_user(&status, optval, len)) {
L
Linus Torvalds 已提交
4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930
		retval = -EFAULT;
		goto out;
	}

	associd = status.sstat_assoc_id;
	asoc = sctp_id2assoc(sk, associd);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	transport = asoc->peer.primary_path;

	status.sstat_assoc_id = sctp_assoc2id(asoc);
4931
	status.sstat_state = sctp_assoc_to_state(asoc);
L
Linus Torvalds 已提交
4932 4933 4934 4935
	status.sstat_rwnd =  asoc->peer.rwnd;
	status.sstat_unackdata = asoc->unack_data;

	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4936 4937
	status.sstat_instrms = asoc->stream.incnt;
	status.sstat_outstrms = asoc->stream.outcnt;
L
Linus Torvalds 已提交
4938 4939
	status.sstat_fragmentation_point = asoc->frag_point;
	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4940 4941
	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
			transport->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
4942
	/* Map ipv4 address into v4-mapped-on-v6 address.  */
4943
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
4944
		(union sctp_addr *)&status.sstat_primary.spinfo_address);
F
Frank Filz 已提交
4945
	status.sstat_primary.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4946 4947 4948
	status.sstat_primary.spinfo_cwnd = transport->cwnd;
	status.sstat_primary.spinfo_srtt = transport->srtt;
	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4949
	status.sstat_primary.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4950

F
Frank Filz 已提交
4951 4952 4953
	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
		status.sstat_primary.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4954 4955 4956 4957 4958
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

4959 4960 4961
	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
		 __func__, len, status.sstat_state, status.sstat_rwnd,
		 status.sstat_assoc_id);
L
Linus Torvalds 已提交
4962 4963 4964 4965 4966 4967 4968

	if (copy_to_user(optval, &status, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
E
Eric Dumazet 已提交
4969
	return retval;
L
Linus Torvalds 已提交
4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987
}


/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
 *
 * Applications can retrieve information about a specific peer address
 * of an association, including its reachability state, congestion
 * window, and retransmission timer values.  This information is
 * read-only.
 */
static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_paddrinfo pinfo;
	struct sctp_transport *transport;
	int retval = 0;

4988
	if (len < sizeof(pinfo)) {
L
Linus Torvalds 已提交
4989 4990 4991 4992
		retval = -EINVAL;
		goto out;
	}

4993 4994
	len = sizeof(pinfo);
	if (copy_from_user(&pinfo, optval, len)) {
L
Linus Torvalds 已提交
4995 4996 4997 4998 4999 5000 5001 5002 5003 5004
		retval = -EFAULT;
		goto out;
	}

	transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
					   pinfo.spinfo_assoc_id);
	if (!transport)
		return -EINVAL;

	pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
F
Frank Filz 已提交
5005
	pinfo.spinfo_state = transport->state;
L
Linus Torvalds 已提交
5006 5007 5008
	pinfo.spinfo_cwnd = transport->cwnd;
	pinfo.spinfo_srtt = transport->srtt;
	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5009
	pinfo.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
5010

F
Frank Filz 已提交
5011 5012 5013
	if (pinfo.spinfo_state == SCTP_UNKNOWN)
		pinfo.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &pinfo, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
E
Eric Dumazet 已提交
5025
	return retval;
L
Linus Torvalds 已提交
5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059
}

/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
 *
 * This option is a on/off flag.  If enabled no SCTP message
 * fragmentation will be performed.  Instead if a message being sent
 * exceeds the current PMTU size, the message will NOT be sent and
 * instead a error will be indicated to the user.
 */
static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
					char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = (sctp_sk(sk)->disable_fragments == 1);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
 *
 * This socket option is used to specify various notifications and
 * ancillary data the user wishes to receive.
 */
static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
				  int __user *optlen)
{
J
Jiri Slaby 已提交
5060
	if (len == 0)
L
Linus Torvalds 已提交
5061
		return -EINVAL;
5062 5063
	if (len > sizeof(struct sctp_event_subscribe))
		len = sizeof(struct sctp_event_subscribe);
5064 5065
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086
	if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
		return -EFAULT;
	return 0;
}

/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
 *
 * This socket option is applicable to the UDP-style socket only.  When
 * set it will cause associations that are idle for more than the
 * specified number of seconds to automatically close.  An association
 * being idle is defined an association that has NOT sent or received
 * user data.  The special value of '0' indicates that no automatic
 * close of any associations should be performed.  The option expects an
 * integer defining the number of seconds of idle time before an
 * association is closed.
 */
static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	/* Applicable to UDP-style socket only */
	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;
5087
	if (len < sizeof(int))
L
Linus Torvalds 已提交
5088
		return -EINVAL;
5089 5090 5091
	len = sizeof(int);
	if (put_user(len, optlen))
		return -EFAULT;
5092
	if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
L
Linus Torvalds 已提交
5093 5094 5095 5096 5097
		return -EFAULT;
	return 0;
}

/* Helper routine to branch off an association to a new socket.  */
B
Benjamin Poirier 已提交
5098
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
L
Linus Torvalds 已提交
5099
{
B
Benjamin Poirier 已提交
5100
	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5101
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
5102 5103 5104
	struct socket *sock;
	int err = 0;

5105 5106 5107 5108
	/* Do not peel off from one netns to another one. */
	if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
		return -EINVAL;

B
Benjamin Poirier 已提交
5109 5110 5111
	if (!asoc)
		return -EINVAL;

L
Linus Torvalds 已提交
5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122
	/* An association cannot be branched off from an already peeled-off
	 * socket, nor is this supported for tcp style sockets.
	 */
	if (!sctp_style(sk, UDP))
		return -EINVAL;

	/* Create a new socket.  */
	err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
	if (err < 0)
		return err;

5123
	sctp_copy_sock(sock->sk, sk, asoc);
5124 5125 5126 5127

	/* Make peeled-off sockets more like 1-1 accepted sockets.
	 * Set the daddr and initialize id to something more random
	 */
5128
	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5129 5130 5131 5132 5133

	/* Populate the fields of the newsk from the oldsk and migrate the
	 * asoc to the newsk.
	 */
	sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5134

L
Linus Torvalds 已提交
5135 5136 5137 5138
	*sockp = sock;

	return err;
}
B
Benjamin Poirier 已提交
5139
EXPORT_SYMBOL(sctp_do_peeloff);
L
Linus Torvalds 已提交
5140

5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176
static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
					  struct file **newfile, unsigned flags)
{
	struct socket *newsock;
	int retval;

	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
	if (retval < 0)
		goto out;

	/* Map the socket to an unused fd that can be returned to the user.  */
	retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
	if (retval < 0) {
		sock_release(newsock);
		goto out;
	}

	*newfile = sock_alloc_file(newsock, 0, NULL);
	if (IS_ERR(*newfile)) {
		put_unused_fd(retval);
		retval = PTR_ERR(*newfile);
		*newfile = NULL;
		return retval;
	}

	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
		 retval);

	peeloff->sd = retval;

	if (flags & SOCK_NONBLOCK)
		(*newfile)->f_flags |= O_NONBLOCK;
out:
	return retval;
}

L
Linus Torvalds 已提交
5177 5178 5179
static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	sctp_peeloff_arg_t peeloff;
5180
	struct file *newfile = NULL;
L
Linus Torvalds 已提交
5181 5182
	int retval = 0;

5183
	if (len < sizeof(sctp_peeloff_arg_t))
L
Linus Torvalds 已提交
5184
		return -EINVAL;
5185
	len = sizeof(sctp_peeloff_arg_t);
L
Linus Torvalds 已提交
5186 5187 5188
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

5189
	retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
L
Linus Torvalds 已提交
5190 5191 5192
	if (retval < 0)
		goto out;

5193 5194 5195 5196 5197
	/* Return the fd mapped to the new socket.  */
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
L
Linus Torvalds 已提交
5198 5199
	}

5200 5201
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
5202
		put_unused_fd(retval);
5203
		return -EFAULT;
5204
	}
5205 5206 5207 5208
	fd_install(retval, newfile);
out:
	return retval;
}
5209

5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226
static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
					 char __user *optval, int __user *optlen)
{
	sctp_peeloff_flags_arg_t peeloff;
	struct file *newfile = NULL;
	int retval = 0;

	if (len < sizeof(sctp_peeloff_flags_arg_t))
		return -EINVAL;
	len = sizeof(sctp_peeloff_flags_arg_t);
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

	retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
						&newfile, peeloff.flags);
	if (retval < 0)
		goto out;
L
Linus Torvalds 已提交
5227 5228

	/* Return the fd mapped to the new socket.  */
5229 5230 5231 5232 5233
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
	}
5234

5235 5236 5237
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
		put_unused_fd(retval);
5238
		return -EFAULT;
5239 5240
	}
	fd_install(retval, newfile);
L
Linus Torvalds 已提交
5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254
out:
	return retval;
}

/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
 *
 * Applications can enable or disable heartbeats for any peer address of
 * an association, modify an address's heartbeat interval, force a
 * heartbeat to be sent immediately, and adjust the address's maximum
 * number of retransmissions sent before an address is considered
 * unreachable.  The following structure is used to access and modify an
 * address's parameters:
 *
 *  struct sctp_paddrparams {
5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266
 *     sctp_assoc_t            spp_assoc_id;
 *     struct sockaddr_storage spp_address;
 *     uint32_t                spp_hbinterval;
 *     uint16_t                spp_pathmaxrxt;
 *     uint32_t                spp_pathmtu;
 *     uint32_t                spp_sackdelay;
 *     uint32_t                spp_flags;
 * };
 *
 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
 *                     application, and identifies the association for
 *                     this query.
L
Linus Torvalds 已提交
5267 5268
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
5269 5270 5271
 *                     in milliseconds.  If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
L
Linus Torvalds 已提交
5272 5273
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336
 *                     considered unreachable. If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
 *   spp_pathmtu     - When Path MTU discovery is disabled the value
 *                     specified here will be the "fixed" path mtu.
 *                     Note that if the spp_address field is empty
 *                     then all associations on this address will
 *                     have this fixed path mtu set upon them.
 *
 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
 *                     the number of milliseconds that sacks will be delayed
 *                     for. This value will apply to all addresses of an
 *                     association if the spp_address field is empty. Note
 *                     also, that if delayed sack is enabled and this
 *                     value is set to 0, no change is made to the last
 *                     recorded delayed sack timer value.
 *
 *   spp_flags       - These flags are used to control various features
 *                     on an association. The flag field may contain
 *                     zero or more of the following options.
 *
 *                     SPP_HB_ENABLE  - Enable heartbeats on the
 *                     specified address. Note that if the address
 *                     field is empty all addresses for the association
 *                     have heartbeats enabled upon them.
 *
 *                     SPP_HB_DISABLE - Disable heartbeats on the
 *                     speicifed address. Note that if the address
 *                     field is empty all addresses for the association
 *                     will have their heartbeats disabled. Note also
 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
 *                     mutually exclusive, only one of these two should
 *                     be specified. Enabling both fields will have
 *                     undetermined results.
 *
 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
 *                     to be made immediately.
 *
 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected.
 *
 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected. Not also that
 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
 *                     exclusive. Enabling both will have undetermined
 *                     results.
 *
 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
 *                     on delayed sack. The time specified in spp_sackdelay
 *                     is used to specify the sack delay for this address. Note
 *                     that if spp_address is empty then all addresses will
 *                     enable delayed sack and take on the sack delay
 *                     value specified in spp_sackdelay.
 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
 *                     off delayed sack. If the spp_address field is blank then
 *                     delayed sack is disabled for the entire association. Note
 *                     also that this field is mutually exclusive to
 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
 *                     results.
L
Linus Torvalds 已提交
5337 5338
 */
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5339
					    char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
5340
{
5341 5342 5343 5344
	struct sctp_paddrparams  params;
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
5345

5346
	if (len < sizeof(struct sctp_paddrparams))
L
Linus Torvalds 已提交
5347
		return -EINVAL;
5348
	len = sizeof(struct sctp_paddrparams);
L
Linus Torvalds 已提交
5349 5350 5351
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

5352 5353
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
L
Linus Torvalds 已提交
5354
	 */
5355
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5356 5357 5358
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans) {
5359
			pr_debug("%s: failed no transport\n", __func__);
5360 5361
			return -EINVAL;
		}
L
Linus Torvalds 已提交
5362 5363
	}

5364 5365 5366 5367 5368 5369
	/* Get association, if assoc_id != 0 and the socket is a one
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
	 */
	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
	if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5370
		pr_debug("%s: failed no association\n", __func__);
L
Linus Torvalds 已提交
5371
		return -EINVAL;
5372
	}
L
Linus Torvalds 已提交
5373

5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397
	if (trans) {
		/* Fetch transport values. */
		params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
		params.spp_pathmtu    = trans->pathmtu;
		params.spp_pathmaxrxt = trans->pathmaxrxt;
		params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);

		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = trans->param_flags;
	} else if (asoc) {
		/* Fetch association values. */
		params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
		params.spp_pathmtu    = asoc->pathmtu;
		params.spp_pathmaxrxt = asoc->pathmaxrxt;
		params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);

		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = asoc->param_flags;
	} else {
		/* Fetch socket values. */
		params.spp_hbinterval = sp->hbinterval;
		params.spp_pathmtu    = sp->pathmtu;
		params.spp_sackdelay  = sp->sackdelay;
		params.spp_pathmaxrxt = sp->pathmaxrxt;
L
Linus Torvalds 已提交
5398

5399 5400 5401
		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = sp->param_flags;
	}
L
Linus Torvalds 已提交
5402 5403 5404 5405 5406 5407 5408 5409 5410 5411

	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	if (put_user(len, optlen))
		return -EFAULT;

	return 0;
}

5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430
/*
 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 *
 * This option will effect the way delayed acks are performed.  This
 * option allows you to get or set the delayed ack time, in
 * milliseconds.  It also allows changing the delayed ack frequency.
 * Changing the frequency to 1 disables the delayed sack algorithm.  If
 * the assoc_id is 0, then this sets or gets the endpoints default
 * values.  If the assoc_id field is non-zero, then the set or get
 * effects the specified association for the one to many model (the
 * assoc_id field is ignored by the one to one model).  Note that if
 * sack_delay or sack_freq are 0 when setting this option, then the
 * current values will remain unchanged.
 *
 * struct sctp_sack_info {
 *     sctp_assoc_t            sack_assoc_id;
 *     uint32_t                sack_delay;
 *     uint32_t                sack_freq;
 * };
5431
 *
5432 5433 5434 5435
 * sack_assoc_id -  This parameter, indicates which association the user
 *    is performing an action upon.  Note that if this field's value is
 *    zero then the endpoints default value is changed (effecting future
 *    associations only).
5436
 *
5437 5438 5439 5440
 * sack_delay -  This parameter contains the number of milliseconds that
 *    the user is requesting the delayed ACK timer be set to.  Note that
 *    this value is defined in the standard to be between 200 and 500
 *    milliseconds.
5441
 *
5442 5443 5444 5445
 * sack_freq -  This parameter contains the number of packets that must
 *    be received before a sack is sent without waiting for the delay
 *    timer to expire.  The default value for this is 2, setting this
 *    value to 1 will disable the delayed sack algorithm.
5446
 */
5447
static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5448 5449 5450
					    char __user *optval,
					    int __user *optlen)
{
5451
	struct sctp_sack_info    params;
5452 5453 5454
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

5455 5456
	if (len >= sizeof(struct sctp_sack_info)) {
		len = sizeof(struct sctp_sack_info);
5457

5458 5459 5460
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else if (len == sizeof(struct sctp_assoc_value)) {
5461
		pr_warn_ratelimited(DEPRECATED
5462
				    "%s (pid %d) "
5463
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5464 5465
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
5466 5467 5468
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
5469
		return -EINVAL;
5470

5471
	/* Get association, if sack_assoc_id != 0 and the socket is a one
5472 5473
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
5474
	 */
5475 5476
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5477 5478 5479 5480
		return -EINVAL;

	if (asoc) {
		/* Fetch association values. */
5481 5482
		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay = jiffies_to_msecs(
5483
				asoc->sackdelay);
5484 5485 5486 5487 5488 5489
			params.sack_freq = asoc->sackfreq;

		} else {
			params.sack_delay = 0;
			params.sack_freq = 1;
		}
5490 5491
	} else {
		/* Fetch socket values. */
5492 5493 5494 5495 5496 5497 5498
		if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay  = sp->sackdelay;
			params.sack_freq = sp->sackfreq;
		} else {
			params.sack_delay  = 0;
			params.sack_freq = 1;
		}
5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509
	}

	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	if (put_user(len, optlen))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
 *
 * Applications can specify protocol parameters for the default association
 * initialization.  The option name argument to setsockopt() and getsockopt()
 * is SCTP_INITMSG.
 *
 * Setting initialization parameters is effective only on an unconnected
 * socket (for UDP-style sockets only future associations are effected
 * by the change).  With TCP-style sockets, this option is inherited by
 * sockets derived from a listener socket.
 */
static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
5523
	if (len < sizeof(struct sctp_initmsg))
L
Linus Torvalds 已提交
5524
		return -EINVAL;
5525 5526 5527
	len = sizeof(struct sctp_initmsg);
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5528 5529 5530 5531 5532
	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
		return -EFAULT;
	return 0;
}

5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558

static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
				      char __user *optval, int __user *optlen)
{
	struct sctp_association *asoc;
	int cnt = 0;
	struct sctp_getaddrs getaddrs;
	struct sctp_transport *from;
	void __user *to;
	union sctp_addr temp;
	struct sctp_sock *sp = sctp_sk(sk);
	int addrlen;
	size_t space_left;
	int bytes_copied;

	if (len < sizeof(struct sctp_getaddrs))
		return -EINVAL;

	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
		return -EFAULT;

	/* For UDP-style sockets, id specifies the association to query.  */
	asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
	if (!asoc)
		return -EINVAL;

5559 5560
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5561

5562 5563
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
				transports) {
5564
		memcpy(&temp, &from->ipaddr, sizeof(temp));
5565 5566
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5567
		if (space_left < addrlen)
5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579
			return -ENOMEM;
		if (copy_to_user(to, &temp, addrlen))
			return -EFAULT;
		to += addrlen;
		cnt++;
		space_left -= addrlen;
	}

	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
		return -EFAULT;
	bytes_copied = ((char __user *)to) - optval;
	if (put_user(bytes_copied, optlen))
L
Linus Torvalds 已提交
5580 5581 5582 5583 5584
		return -EFAULT;

	return 0;
}

5585 5586
static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
			    size_t space_left, int *bytes_copied)
5587 5588 5589 5590 5591
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr temp;
	int cnt = 0;
	int addrlen;
5592
	struct net *net = sock_net(sk);
5593

5594
	rcu_read_lock();
5595
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5596 5597 5598
		if (!addr->valid)
			continue;

5599
		if ((PF_INET == sk->sk_family) &&
5600
		    (AF_INET6 == addr->a.sa.sa_family))
5601
			continue;
5602 5603 5604 5605
		if ((PF_INET6 == sk->sk_family) &&
		    inet_v6_ipv6only(sk) &&
		    (AF_INET == addr->a.sa.sa_family))
			continue;
5606
		memcpy(&temp, &addr->a, sizeof(temp));
5607 5608 5609
		if (!temp.v4.sin_port)
			temp.v4.sin_port = htons(port);

5610 5611 5612
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sctp_sk(sk), &temp);

5613 5614 5615 5616
		if (space_left < addrlen) {
			cnt =  -ENOMEM;
			break;
		}
5617
		memcpy(to, &temp, addrlen);
5618

5619
		to += addrlen;
5620
		cnt++;
5621
		space_left -= addrlen;
5622
		*bytes_copied += addrlen;
5623
	}
5624
	rcu_read_unlock();
5625 5626 5627 5628

	return cnt;
}

L
Linus Torvalds 已提交
5629

5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643
static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
				       char __user *optval, int __user *optlen)
{
	struct sctp_bind_addr *bp;
	struct sctp_association *asoc;
	int cnt = 0;
	struct sctp_getaddrs getaddrs;
	struct sctp_sockaddr_entry *addr;
	void __user *to;
	union sctp_addr temp;
	struct sctp_sock *sp = sctp_sk(sk);
	int addrlen;
	int err = 0;
	size_t space_left;
5644 5645
	int bytes_copied = 0;
	void *addrs;
5646
	void *buf;
5647

5648
	if (len < sizeof(struct sctp_getaddrs))
5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668
		return -EINVAL;

	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
		return -EFAULT;

	/*
	 *  For UDP-style sockets, id specifies the association to query.
	 *  If the id field is set to the value '0' then the locally bound
	 *  addresses are returned without regard to any particular
	 *  association.
	 */
	if (0 == getaddrs.assoc_id) {
		bp = &sctp_sk(sk)->ep->base.bind_addr;
	} else {
		asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
		if (!asoc)
			return -EINVAL;
		bp = &asoc->base.bind_addr;
	}

5669 5670
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5671

5672
	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5673 5674
	if (!addrs)
		return -ENOMEM;
5675 5676 5677 5678 5679 5680 5681

	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
	 * addresses from the global local address list.
	 */
	if (sctp_list_single_entry(&bp->address_list)) {
		addr = list_entry(bp->address_list.next,
				  struct sctp_sockaddr_entry, list);
5682
		if (sctp_is_any(sk, &addr->a)) {
5683 5684
			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
						space_left, &bytes_copied);
5685 5686
			if (cnt < 0) {
				err = cnt;
5687
				goto out;
5688
			}
5689
			goto copy_getaddrs;
5690 5691 5692
		}
	}

5693
	buf = addrs;
5694 5695 5696 5697 5698
	/* Protection on the bound address list is not needed since
	 * in the socket option context we hold a socket lock and
	 * thus the bound address list can't change.
	 */
	list_for_each_entry(addr, &bp->address_list, list) {
5699
		memcpy(&temp, &addr->a, sizeof(temp));
5700 5701
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5702 5703
		if (space_left < addrlen) {
			err =  -ENOMEM; /*fixme: right error?*/
5704
			goto out;
5705
		}
5706 5707
		memcpy(buf, &temp, addrlen);
		buf += addrlen;
5708
		bytes_copied += addrlen;
5709
		cnt++;
5710 5711 5712 5713
		space_left -= addrlen;
	}

copy_getaddrs:
5714 5715
	if (copy_to_user(to, addrs, bytes_copied)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5716
		goto out;
5717
	}
5718 5719
	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5720
		goto out;
5721
	}
5722 5723 5724
	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
	 * but we can't change it anymore.
	 */
5725
	if (put_user(bytes_copied, optlen))
5726
		err = -EFAULT;
S
Sebastian Siewior 已提交
5727
out:
5728
	kfree(addrs);
5729 5730 5731
	return err;
}

L
Linus Torvalds 已提交
5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 *
 * Requests that the local SCTP stack use the enclosed peer address as
 * the association primary.  The enclosed address must be one of the
 * association peer's addresses.
 */
static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
					char __user *optval, int __user *optlen)
{
	struct sctp_prim prim;
	struct sctp_association *asoc;
	struct sctp_sock *sp = sctp_sk(sk);

5745
	if (len < sizeof(struct sctp_prim))
L
Linus Torvalds 已提交
5746 5747
		return -EINVAL;

5748 5749 5750
	len = sizeof(struct sctp_prim);

	if (copy_from_user(&prim, optval, len))
L
Linus Torvalds 已提交
5751 5752 5753 5754 5755 5756 5757 5758
		return -EFAULT;

	asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
	if (!asoc)
		return -EINVAL;

	if (!asoc->peer.primary_path)
		return -ENOTCONN;
5759

5760 5761
	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
		asoc->peer.primary_path->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
5762

5763
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
L
Linus Torvalds 已提交
5764 5765
			(union sctp_addr *)&prim.ssp_addr);

5766 5767 5768
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &prim, len))
L
Linus Torvalds 已提交
5769 5770 5771 5772 5773 5774
		return -EFAULT;

	return 0;
}

/*
5775
 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
L
Linus Torvalds 已提交
5776
 *
5777
 * Requests that the local endpoint set the specified Adaptation Layer
L
Linus Torvalds 已提交
5778 5779
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
5780
static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
L
Linus Torvalds 已提交
5781 5782
				  char __user *optval, int __user *optlen)
{
5783
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
5784

5785
	if (len < sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
5786 5787
		return -EINVAL;

5788 5789
	len = sizeof(struct sctp_setadaptation);

5790
	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5791 5792 5793

	if (put_user(len, optlen))
		return -EFAULT;
5794
	if (copy_to_user(optval, &adaptation, len))
L
Linus Torvalds 已提交
5795
		return -EFAULT;
5796

L
Linus Torvalds 已提交
5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823
	return 0;
}

/*
 *
 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
 *
 *   Applications that wish to use the sendto() system call may wish to
 *   specify a default set of parameters that would normally be supplied
 *   through the inclusion of ancillary data.  This socket option allows
 *   such an application to set the default sctp_sndrcvinfo structure.


 *   The application that wishes to use this socket option simply passes
 *   in to this call the sctp_sndrcvinfo structure defined in Section
 *   5.2.2) The input parameters accepted by this call include
 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
 *   to this call if the caller is using the UDP model.
 *
 *   For getsockopt, it get the default sctp_sndrcvinfo structure.
 */
static int sctp_getsockopt_default_send_param(struct sock *sk,
					int len, char __user *optval,
					int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
5824 5825
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
5826

5827
	if (len < sizeof(info))
L
Linus Torvalds 已提交
5828
		return -EINVAL;
5829

5830
	len = sizeof(info);
5831 5832

	if (copy_from_user(&info, optval, len))
L
Linus Torvalds 已提交
5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851
		return -EFAULT;

	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		info.sinfo_stream = asoc->default_stream;
		info.sinfo_flags = asoc->default_flags;
		info.sinfo_ppid = asoc->default_ppid;
		info.sinfo_context = asoc->default_context;
		info.sinfo_timetolive = asoc->default_timetolive;
	} else {
		info.sinfo_stream = sp->default_stream;
		info.sinfo_flags = sp->default_flags;
		info.sinfo_ppid = sp->default_ppid;
		info.sinfo_context = sp->default_context;
		info.sinfo_timetolive = sp->default_timetolive;
	}

5852 5853 5854
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
L
Linus Torvalds 已提交
5855 5856 5857 5858 5859
		return -EFAULT;

	return 0;
}

5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901
/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
 * (SCTP_DEFAULT_SNDINFO)
 */
static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_sndinfo info;

	if (len < sizeof(info))
		return -EINVAL;

	len = sizeof(info);

	if (copy_from_user(&info, optval, len))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		info.snd_sid = asoc->default_stream;
		info.snd_flags = asoc->default_flags;
		info.snd_ppid = asoc->default_ppid;
		info.snd_context = asoc->default_context;
	} else {
		info.snd_sid = sp->default_stream;
		info.snd_flags = sp->default_flags;
		info.snd_ppid = sp->default_ppid;
		info.snd_context = sp->default_context;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946
/*
 *
 * 7.1.5 SCTP_NODELAY
 *
 * Turn on/off any Nagle-like algorithm.  This means that packets are
 * generally sent as soon as possible and no unnecessary delays are
 * introduced, at the cost of more packets in the network.  Expects an
 * integer boolean flag.
 */

static int sctp_getsockopt_nodelay(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = (sctp_sk(sk)->nodelay == 1);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

/*
 *
 * 7.1.1 SCTP_RTOINFO
 *
 * The protocol parameters used to initialize and bound retransmission
 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
 * and modify these parameters.
 * All parameters are time values, in milliseconds.  A value of 0, when
 * modifying the parameters, indicates that the current value should not
 * be changed.
 *
 */
static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
				char __user *optval,
				int __user *optlen) {
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;

5947
	if (len < sizeof (struct sctp_rtoinfo))
L
Linus Torvalds 已提交
5948 5949
		return -EINVAL;

5950 5951 5952
	len = sizeof(struct sctp_rtoinfo);

	if (copy_from_user(&rtoinfo, optval, len))
L
Linus Torvalds 已提交
5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986
		return -EFAULT;

	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);

	if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Values corresponding to the specific association. */
	if (asoc) {
		rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
		rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
		rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
	} else {
		/* Values corresponding to the endpoint. */
		struct sctp_sock *sp = sctp_sk(sk);

		rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
		rtoinfo.srto_max = sp->rtoinfo.srto_max;
		rtoinfo.srto_min = sp->rtoinfo.srto_min;
	}

	if (put_user(len, optlen))
		return -EFAULT;

	if (copy_to_user(optval, &rtoinfo, len))
		return -EFAULT;

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
5987
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003
 * of the association.
 * Returns an error if the new association retransmission value is
 * greater than the sum of the retransmission value  of the peer.
 * See [SCTP] for more information.
 *
 */
static int sctp_getsockopt_associnfo(struct sock *sk, int len,
				     char __user *optval,
				     int __user *optlen)
{

	struct sctp_assocparams assocparams;
	struct sctp_association *asoc;
	struct list_head *pos;
	int cnt = 0;

6004
	if (len < sizeof (struct sctp_assocparams))
L
Linus Torvalds 已提交
6005 6006
		return -EINVAL;

6007 6008 6009
	len = sizeof(struct sctp_assocparams);

	if (copy_from_user(&assocparams, optval, len))
L
Linus Torvalds 已提交
6010 6011 6012 6013 6014 6015 6016 6017
		return -EFAULT;

	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);

	if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Values correspoinding to the specific association */
6018
	if (asoc) {
L
Linus Torvalds 已提交
6019 6020 6021
		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6022
		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
L
Linus Torvalds 已提交
6023 6024

		list_for_each(pos, &asoc->peer.transport_addr_list) {
6025
			cnt++;
L
Linus Torvalds 已提交
6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080
		}

		assocparams.sasoc_number_peer_destinations = cnt;
	} else {
		/* Values corresponding to the endpoint */
		struct sctp_sock *sp = sctp_sk(sk);

		assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
		assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
		assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
		assocparams.sasoc_cookie_life =
					sp->assocparams.sasoc_cookie_life;
		assocparams.sasoc_number_peer_destinations =
					sp->assocparams.
					sasoc_number_peer_destinations;
	}

	if (put_user(len, optlen))
		return -EFAULT;

	if (copy_to_user(optval, &assocparams, len))
		return -EFAULT;

	return 0;
}

/*
 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
 *
 * This socket option is a boolean flag which turns on or off mapped V4
 * addresses.  If this option is turned on and the socket is type
 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
 * If this option is turned off, then no mapping will be done of V4
 * addresses and a user will receive both PF_INET6 and PF_INET type
 * addresses on the socket.
 */
static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = sp->v4mapped;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091
/*
 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
 * (chapter and verse is quoted at sctp_setsockopt_context())
 */
static int sctp_getsockopt_context(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;

6092
	if (len < sizeof(struct sctp_assoc_value))
6093 6094
		return -EINVAL;

6095 6096
	len = sizeof(struct sctp_assoc_value);

6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		params.assoc_value = asoc->default_rcv_context;
	} else {
		params.assoc_value = sp->default_rcv_context;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
6119
/*
6120 6121 6122
 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
 * This option will get or set the maximum size to put in any outgoing
 * SCTP DATA chunk.  If a message is larger than this size it will be
L
Linus Torvalds 已提交
6123 6124 6125
 * fragmented by SCTP into the specified size.  Note that the underlying
 * SCTP implementation may fragment into smaller sized chunks when the
 * PMTU of the underlying association is smaller than the value set by
6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144
 * the user.  The default value for this option is '0' which indicates
 * the user is NOT limiting fragmentation and only the PMTU will effect
 * SCTP's choice of DATA chunk size.  Note also that values set larger
 * than the maximum size of an IP datagram will effectively let SCTP
 * control fragmentation (i.e. the same as setting this option to 0).
 *
 * The following structure is used to access and modify this parameter:
 *
 * struct sctp_assoc_value {
 *   sctp_assoc_t assoc_id;
 *   uint32_t assoc_value;
 * };
 *
 * assoc_id:  This parameter is ignored for one-to-one style sockets.
 *    For one-to-many style sockets this parameter indicates which
 *    association the user is performing an action upon.  Note that if
 *    this field's value is zero then the endpoints default value is
 *    changed (effecting future associations only).
 * assoc_value:  This parameter specifies the maximum size in bytes.
L
Linus Torvalds 已提交
6145 6146 6147 6148
 */
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
				  char __user *optval, int __user *optlen)
{
6149 6150
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
L
Linus Torvalds 已提交
6151

6152
	if (len == sizeof(int)) {
6153
		pr_warn_ratelimited(DEPRECATED
6154
				    "%s (pid %d) "
6155
				    "Use of int in maxseg socket option.\n"
6156 6157
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6158 6159 6160
		params.assoc_id = 0;
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6161
		if (copy_from_user(&params, optval, len))
6162 6163
			return -EFAULT;
	} else
L
Linus Torvalds 已提交
6164 6165
		return -EINVAL;

6166 6167 6168 6169 6170 6171 6172 6173
	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc && params.assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
		params.assoc_value = asoc->frag_point;
	else
		params.assoc_value = sctp_sk(sk)->user_frag;
L
Linus Torvalds 已提交
6174 6175 6176

	if (put_user(len, optlen))
		return -EFAULT;
6177 6178 6179 6180 6181 6182 6183
	if (len == sizeof(int)) {
		if (copy_to_user(optval, &params.assoc_value, len))
			return -EFAULT;
	} else {
		if (copy_to_user(optval, &params, len))
			return -EFAULT;
	}
L
Linus Torvalds 已提交
6184 6185 6186 6187

	return 0;
}

6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210
/*
 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
 */
static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
					       char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);

	val = sctp_sk(sk)->frag_interleave;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6211 6212 6213 6214 6215 6216 6217 6218
/*
 * 7.1.25.  Set or Get the sctp partial delivery point
 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
 */
static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
						  char __user *optval,
						  int __user *optlen)
{
6219
	u32 val;
6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231

	if (len < sizeof(u32))
		return -EINVAL;

	len = sizeof(u32);

	val = sctp_sk(sk)->pd_point;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6232
	return 0;
6233 6234
}

6235 6236 6237 6238 6239 6240 6241 6242
/*
 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
 */
static int sctp_getsockopt_maxburst(struct sock *sk, int len,
				    char __user *optval,
				    int __user *optlen)
{
6243 6244 6245
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
6246

6247
	if (len == sizeof(int)) {
6248
		pr_warn_ratelimited(DEPRECATED
6249
				    "%s (pid %d) "
6250
				    "Use of int in max_burst socket option.\n"
6251 6252
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6253
		params.assoc_id = 0;
6254 6255
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6256 6257 6258 6259
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
		return -EINVAL;
6260

6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279
	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		params.assoc_value = asoc->max_burst;
	} else
		params.assoc_value = sp->max_burst;

	if (len == sizeof(int)) {
		if (copy_to_user(optval, &params.assoc_value, len))
			return -EFAULT;
	} else {
		if (copy_to_user(optval, &params, len))
			return -EFAULT;
	}

	return 0;
6280 6281 6282

}

6283 6284 6285
static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6286
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6287
	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6288
	struct sctp_hmac_algo_param *hmacs;
6289 6290
	__u16 data_len = 0;
	u32 num_idents;
6291
	int i;
6292

6293
	if (!ep->auth_enable)
6294
		return -EACCES;
6295

6296
	hmacs = ep->auth_hmacs_list;
6297 6298
	data_len = ntohs(hmacs->param_hdr.length) -
		   sizeof(struct sctp_paramhdr);
6299

6300
	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6301
		return -EINVAL;
6302 6303 6304 6305

	len = sizeof(struct sctp_hmacalgo) + data_len;
	num_idents = data_len / sizeof(u16);

6306 6307
	if (put_user(len, optlen))
		return -EFAULT;
6308 6309
	if (put_user(num_idents, &p->shmac_num_idents))
		return -EFAULT;
6310 6311 6312 6313 6314 6315
	for (i = 0; i < num_idents; i++) {
		__u16 hmacid = ntohs(hmacs->hmac_ids[i]);

		if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
			return -EFAULT;
	}
6316 6317 6318 6319 6320 6321
	return 0;
}

static int sctp_getsockopt_active_key(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6322
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6323 6324 6325
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

6326
	if (!ep->auth_enable)
6327 6328
		return -EACCES;

6329 6330
	if (len < sizeof(struct sctp_authkeyid))
		return -EINVAL;
6331 6332 6333

	len = sizeof(struct sctp_authkeyid);
	if (copy_from_user(&val, optval, len))
6334 6335 6336 6337 6338 6339 6340 6341 6342
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
		val.scact_keynumber = asoc->active_key_id;
	else
6343
		val.scact_keynumber = ep->active_key_id;
6344

6345 6346 6347 6348 6349
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6350 6351 6352 6353 6354 6355
	return 0;
}

static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6356
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6357
	struct sctp_authchunks __user *p = (void __user *)optval;
6358 6359 6360
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6361
	u32    num_chunks = 0;
6362 6363
	char __user *to;

6364
	if (!ep->auth_enable)
6365 6366 6367
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6368 6369
		return -EINVAL;

6370
	if (copy_from_user(&val, optval, sizeof(val)))
6371 6372
		return -EFAULT;

A
Al Viro 已提交
6373
	to = p->gauth_chunks;
6374 6375 6376 6377 6378
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc)
		return -EINVAL;

	ch = asoc->peer.peer_chunks;
6379 6380
	if (!ch)
		goto num;
6381 6382

	/* See if the user provided enough room for all the data */
6383
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6384
	if (len < num_chunks)
6385 6386
		return -EINVAL;

6387
	if (copy_to_user(to, ch->chunks, num_chunks))
6388
		return -EFAULT;
6389 6390
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6391 6392
	if (put_user(len, optlen))
		return -EFAULT;
6393 6394
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6395 6396 6397 6398 6399 6400
	return 0;
}

static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6401
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6402
	struct sctp_authchunks __user *p = (void __user *)optval;
6403 6404 6405
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6406
	u32    num_chunks = 0;
6407 6408
	char __user *to;

6409
	if (!ep->auth_enable)
6410 6411 6412
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6413 6414
		return -EINVAL;

6415
	if (copy_from_user(&val, optval, sizeof(val)))
6416 6417
		return -EFAULT;

A
Al Viro 已提交
6418
	to = p->gauth_chunks;
6419 6420 6421 6422 6423
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
6424
		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6425
	else
6426
		ch = ep->auth_chunk_list;
6427

6428 6429 6430
	if (!ch)
		goto num;

6431
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6432
	if (len < sizeof(struct sctp_authchunks) + num_chunks)
6433 6434
		return -EINVAL;

6435 6436 6437 6438
	if (copy_to_user(to, ch->chunks, num_chunks))
		return -EFAULT;
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6439 6440
	if (put_user(len, optlen))
		return -EFAULT;
6441 6442
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6443 6444 6445 6446

	return 0;
}

6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478
/*
 * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
 * This option gets the current number of associations that are attached
 * to a one-to-many style socket.  The option value is an uint32_t.
 */
static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	u32 val = 0;

	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;

	if (len < sizeof(u32))
		return -EINVAL;

	len = sizeof(u32);

	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		val++;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500
/*
 * 8.1.23 SCTP_AUTO_ASCONF
 * See the corresponding setsockopt entry as description
 */
static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530
/*
 * 8.2.6. Get the Current Identifiers of Associations
 *        (SCTP_GET_ASSOC_ID_LIST)
 *
 * This option gets the current list of SCTP association identifiers of
 * the SCTP associations handled by a one-to-many style socket.
 */
static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_assoc_ids *ids;
	u32 num = 0;

	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;

	if (len < sizeof(struct sctp_assoc_ids))
		return -EINVAL;

	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		num++;
	}

	if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
		return -EINVAL;

	len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;

6531
	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549
	if (unlikely(!ids))
		return -ENOMEM;

	ids->gaids_number_of_ids = num;
	num = 0;
	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		ids->gaids_assoc_id[num++] = asoc->assoc_id;
	}

	if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
		kfree(ids);
		return -EFAULT;
	}

	kfree(ids);
	return 0;
}

6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594
/*
 * SCTP_PEER_ADDR_THLDS
 *
 * This option allows us to fetch the partially failed threshold for one or all
 * transports in an association.  See Section 6.1 of:
 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
 */
static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
					    char __user *optval,
					    int len,
					    int __user *optlen)
{
	struct sctp_paddrthlds val;
	struct sctp_transport *trans;
	struct sctp_association *asoc;

	if (len < sizeof(struct sctp_paddrthlds))
		return -EINVAL;
	len = sizeof(struct sctp_paddrthlds);
	if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
		return -EFAULT;

	if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
		asoc = sctp_id2assoc(sk, val.spt_assoc_id);
		if (!asoc)
			return -ENOENT;

		val.spt_pathpfthld = asoc->pf_retrans;
		val.spt_pathmaxrxt = asoc->pathmaxrxt;
	} else {
		trans = sctp_addr_id2transport(sk, &val.spt_address,
					       val.spt_assoc_id);
		if (!trans)
			return -ENOENT;

		val.spt_pathmaxrxt = trans->pathmaxrxt;
		val.spt_pathpfthld = trans->pf_retrans;
	}

	if (put_user(len, optlen) || copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611
/*
 * SCTP_GET_ASSOC_STATS
 *
 * This option retrieves local per endpoint statistics. It is modeled
 * after OpenSolaris' implementation
 */
static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
				       char __user *optval,
				       int __user *optlen)
{
	struct sctp_assoc_stats sas;
	struct sctp_association *asoc = NULL;

	/* User must provide at least the assoc id */
	if (len < sizeof(sctp_assoc_t))
		return -EINVAL;

6612 6613 6614
	/* Allow the struct to grow and fill in as much as possible */
	len = min_t(size_t, len, sizeof(sas));

6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650
	if (copy_from_user(&sas, optval, len))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
	if (!asoc)
		return -EINVAL;

	sas.sas_rtxchunks = asoc->stats.rtxchunks;
	sas.sas_gapcnt = asoc->stats.gapcnt;
	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
	sas.sas_osacks = asoc->stats.osacks;
	sas.sas_isacks = asoc->stats.isacks;
	sas.sas_octrlchunks = asoc->stats.octrlchunks;
	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
	sas.sas_oodchunks = asoc->stats.oodchunks;
	sas.sas_iodchunks = asoc->stats.iodchunks;
	sas.sas_ouodchunks = asoc->stats.ouodchunks;
	sas.sas_iuodchunks = asoc->stats.iuodchunks;
	sas.sas_idupchunks = asoc->stats.idupchunks;
	sas.sas_opackets = asoc->stats.opackets;
	sas.sas_ipackets = asoc->stats.ipackets;

	/* New high max rto observed, will return 0 if not a single
	 * RTO update took place. obs_rto_ipaddr will be bogus
	 * in such a case
	 */
	sas.sas_maxrto = asoc->stats.max_obs_rto;
	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
		sizeof(struct sockaddr_storage));

	/* Mark beginning of a new observation period */
	asoc->stats.max_obs_rto = asoc->rto_min;

	if (put_user(len, optlen))
		return -EFAULT;

6651
	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6652 6653 6654 6655 6656 6657 6658

	if (copy_to_user(optval, &sas, len))
		return -EFAULT;

	return 0;
}

6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678
static int sctp_getsockopt_recvrcvinfo(struct sock *sk,	int len,
				       char __user *optval,
				       int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->recvrcvinfo)
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698
static int sctp_getsockopt_recvnxtinfo(struct sock *sk,	int len,
				       char __user *optval,
				       int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->recvnxtinfo)
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739
static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
					char __user *optval,
					int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->prsctp_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->prsctp_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782
static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_default_prinfo info;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(info)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(info);
	if (copy_from_user(&info, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
	if (asoc) {
		info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
		info.pr_value = asoc->default_timetolive;
	} else if (!info.pr_assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
		info.pr_value = sp->default_timetolive;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &info, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840
static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_prstatus params;
	struct sctp_association *asoc;
	int policy;
	int retval = -EINVAL;

	if (len < sizeof(params))
		goto out;

	len = sizeof(params);
	if (copy_from_user(&params, optval, len)) {
		retval = -EFAULT;
		goto out;
	}

	policy = params.sprstat_policy;
	if (policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
	if (!asoc)
		goto out;

	if (policy == SCTP_PR_SCTP_NONE) {
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
			params.sprstat_abandoned_unsent +=
				asoc->abandoned_unsent[policy];
			params.sprstat_abandoned_sent +=
				asoc->abandoned_sent[policy];
		}
	} else {
		params.sprstat_abandoned_unsent =
			asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
		params.sprstat_abandoned_sent =
			asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
	}

	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

	retval = 0;

out:
	return retval;
}

6841 6842 6843 6844
static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
6845
	struct sctp_stream_out_ext *streamoute;
6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864
	struct sctp_association *asoc;
	struct sctp_prstatus params;
	int retval = -EINVAL;
	int policy;

	if (len < sizeof(params))
		goto out;

	len = sizeof(params);
	if (copy_from_user(&params, optval, len)) {
		retval = -EFAULT;
		goto out;
	}

	policy = params.sprstat_policy;
	if (policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6865
	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6866 6867
		goto out;

6868 6869 6870 6871 6872 6873 6874 6875 6876
	streamoute = asoc->stream.out[params.sprstat_sid].ext;
	if (!streamoute) {
		/* Not allocated yet, means all stats are 0 */
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		retval = 0;
		goto out;
	}

6877 6878 6879 6880 6881
	if (policy == SCTP_PR_SCTP_NONE) {
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
			params.sprstat_abandoned_unsent +=
6882
				streamoute->abandoned_unsent[policy];
6883
			params.sprstat_abandoned_sent +=
6884
				streamoute->abandoned_sent[policy];
6885 6886 6887
		}
	} else {
		params.sprstat_abandoned_unsent =
6888
			streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6889
		params.sprstat_abandoned_sent =
6890
			streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903
	}

	if (put_user(len, optlen) || copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

	retval = 0;

out:
	return retval;
}

6904 6905 6906 6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944
static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
					      char __user *optval,
					      int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->reconf_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->reconf_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985
static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->strreset_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->strreset_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022
static int sctp_getsockopt_scheduler(struct sock *sk, int len,
				     char __user *optval,
				     int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	params.assoc_value = sctp_sched_get_sched(asoc);

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062 7063 7064
static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_stream_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	retval = sctp_sched_get_value(asoc, params.stream_id,
				      &params.stream_value);
	if (retval)
		goto out;

	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
	return retval;
}

7065 7066 7067 7068 7069 7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105
static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
						  char __user *optval,
						  int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->intl_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->strm_interleave;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

7106 7107
static int sctp_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
7108 7109 7110 7111
{
	int retval = 0;
	int len;

7112
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129

	/* I can hardly begin to describe how wrong this is.  This is
	 * so broken as to be worse than useless.  The API draft
	 * REALLY is NOT helpful here...  I am not convinced that the
	 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
	 * are at all well-founded.
	 */
	if (level != SOL_SCTP) {
		struct sctp_af *af = sctp_sk(sk)->pf->af;

		retval = af->getsockopt(sk, level, optname, optval, optlen);
		return retval;
	}

	if (get_user(len, optlen))
		return -EFAULT;

J
Jiri Slaby 已提交
7130 7131 7132
	if (len < 0)
		return -EINVAL;

7133
	lock_sock(sk);
L
Linus Torvalds 已提交
7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151

	switch (optname) {
	case SCTP_STATUS:
		retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
		break;
	case SCTP_DISABLE_FRAGMENTS:
		retval = sctp_getsockopt_disable_fragments(sk, len, optval,
							   optlen);
		break;
	case SCTP_EVENTS:
		retval = sctp_getsockopt_events(sk, len, optval, optlen);
		break;
	case SCTP_AUTOCLOSE:
		retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
		break;
	case SCTP_SOCKOPT_PEELOFF:
		retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
		break;
7152 7153 7154
	case SCTP_SOCKOPT_PEELOFF_FLAGS:
		retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7155 7156 7157 7158
	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
							  optlen);
		break;
7159
	case SCTP_DELAYED_SACK:
7160
		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7161 7162
							  optlen);
		break;
L
Linus Torvalds 已提交
7163 7164 7165 7166 7167 7168 7169 7170 7171 7172 7173
	case SCTP_INITMSG:
		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
		break;
	case SCTP_GET_PEER_ADDRS:
		retval = sctp_getsockopt_peer_addrs(sk, len, optval,
						    optlen);
		break;
	case SCTP_GET_LOCAL_ADDRS:
		retval = sctp_getsockopt_local_addrs(sk, len, optval,
						     optlen);
		break;
7174 7175 7176
	case SCTP_SOCKOPT_CONNECTX3:
		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7177 7178 7179 7180
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_getsockopt_default_send_param(sk, len,
							    optval, optlen);
		break;
7181 7182 7183 7184
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_getsockopt_default_sndinfo(sk, len,
							 optval, optlen);
		break;
L
Linus Torvalds 已提交
7185 7186 7187 7188 7189 7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206
	case SCTP_PRIMARY_ADDR:
		retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
		break;
	case SCTP_NODELAY:
		retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
		break;
	case SCTP_RTOINFO:
		retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
		break;
	case SCTP_ASSOCINFO:
		retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
		break;
	case SCTP_I_WANT_MAPPED_V4_ADDR:
		retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
		break;
	case SCTP_MAXSEG:
		retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
		break;
	case SCTP_GET_PEER_ADDR_INFO:
		retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
							optlen);
		break;
7207 7208
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
L
Linus Torvalds 已提交
7209 7210
							optlen);
		break;
7211 7212 7213
	case SCTP_CONTEXT:
		retval = sctp_getsockopt_context(sk, len, optval, optlen);
		break;
7214 7215 7216 7217
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
							     optlen);
		break;
7218 7219 7220 7221
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
								optlen);
		break;
7222 7223 7224
	case SCTP_MAX_BURST:
		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
		break;
7225 7226 7227 7228 7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240 7241 7242 7243
	case SCTP_AUTH_KEY:
	case SCTP_AUTH_CHUNK:
	case SCTP_AUTH_DELETE_KEY:
		retval = -EOPNOTSUPP;
		break;
	case SCTP_HMAC_IDENT:
		retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
		break;
	case SCTP_AUTH_ACTIVE_KEY:
		retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
		break;
	case SCTP_PEER_AUTH_CHUNKS:
		retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
							optlen);
		break;
	case SCTP_LOCAL_AUTH_CHUNKS:
		retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
							optlen);
		break;
7244 7245 7246
	case SCTP_GET_ASSOC_NUMBER:
		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
		break;
7247 7248 7249
	case SCTP_GET_ASSOC_ID_LIST:
		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
		break;
7250 7251 7252
	case SCTP_AUTO_ASCONF:
		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
		break;
7253 7254 7255
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
		break;
7256 7257 7258
	case SCTP_GET_ASSOC_STATS:
		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
		break;
7259 7260 7261
	case SCTP_RECVRCVINFO:
		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
		break;
7262 7263 7264
	case SCTP_RECVNXTINFO:
		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
		break;
7265 7266 7267
	case SCTP_PR_SUPPORTED:
		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
		break;
7268 7269 7270 7271
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
							optlen);
		break;
7272 7273 7274 7275
	case SCTP_PR_ASSOC_STATUS:
		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
							optlen);
		break;
7276 7277 7278 7279
	case SCTP_PR_STREAM_STATUS:
		retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
							 optlen);
		break;
7280 7281 7282 7283
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
							    optlen);
		break;
7284 7285 7286 7287
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
							 optlen);
		break;
7288 7289 7290 7291
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_getsockopt_scheduler(sk, len, optval,
						   optlen);
		break;
7292 7293 7294 7295
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_getsockopt_scheduler_value(sk, len, optval,
							 optlen);
		break;
7296 7297 7298 7299
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
7300 7301 7302
	default:
		retval = -ENOPROTOOPT;
		break;
7303
	}
L
Linus Torvalds 已提交
7304

7305
	release_sock(sk);
L
Linus Torvalds 已提交
7306 7307 7308
	return retval;
}

7309
static int sctp_hash(struct sock *sk)
L
Linus Torvalds 已提交
7310 7311
{
	/* STUB */
7312
	return 0;
L
Linus Torvalds 已提交
7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326 7327 7328 7329 7330 7331 7332
}

static void sctp_unhash(struct sock *sk)
{
	/* STUB */
}

/* Check if port is acceptable.  Possibly find first available port.
 *
 * The port hash table (contained in the 'global' SCTP protocol storage
 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
 * list (the list number is the port number hashed out, so as you
 * would expect from a hash function, all the ports in a given list have
 * such a number that hashes out to the same list number; you were
 * expecting that, right?); so each list has a set of ports, with a
 * link to the socket (struct sock) that uses it, the port number and
 * a fastreuse flag (FIXME: NPI ipg).
 */
static struct sctp_bind_bucket *sctp_bucket_create(
7333
	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
L
Linus Torvalds 已提交
7334 7335 7336 7337

static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
{
	struct sctp_bind_hashbucket *head; /* hash list */
7338
	struct sctp_bind_bucket *pp;
L
Linus Torvalds 已提交
7339 7340 7341
	unsigned short snum;
	int ret;

A
Al Viro 已提交
7342
	snum = ntohs(addr->v4.sin_port);
L
Linus Torvalds 已提交
7343

7344 7345
	pr_debug("%s: begins, snum:%d\n", __func__, snum);

7346
	local_bh_disable();
L
Linus Torvalds 已提交
7347 7348

	if (snum == 0) {
S
Stephen Hemminger 已提交
7349
		/* Search for an available port. */
7350 7351
		int low, high, remaining, index;
		unsigned int rover;
7352
		struct net *net = sock_net(sk);
7353

7354
		inet_get_local_port_range(net, &low, &high);
7355
		remaining = (high - low) + 1;
7356
		rover = prandom_u32() % remaining + low;
L
Linus Torvalds 已提交
7357 7358 7359 7360 7361

		do {
			rover++;
			if ((rover < low) || (rover > high))
				rover = low;
7362
			if (inet_is_local_reserved_port(net, rover))
7363
				continue;
7364
			index = sctp_phashfn(sock_net(sk), rover);
L
Linus Torvalds 已提交
7365
			head = &sctp_port_hashtable[index];
7366
			spin_lock(&head->lock);
7367
			sctp_for_each_hentry(pp, &head->chain)
7368 7369
				if ((pp->port == rover) &&
				    net_eq(sock_net(sk), pp->net))
L
Linus Torvalds 已提交
7370 7371 7372
					goto next;
			break;
		next:
7373
			spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7374 7375 7376 7377 7378 7379 7380 7381 7382 7383 7384 7385 7386 7387 7388 7389 7390 7391 7392
		} while (--remaining > 0);

		/* Exhausted local port range during search? */
		ret = 1;
		if (remaining <= 0)
			goto fail;

		/* OK, here is the one we will use.  HEAD (the port
		 * hash table list entry) is non-NULL and we hold it's
		 * mutex.
		 */
		snum = rover;
	} else {
		/* We are given an specific port number; we verify
		 * that it is not being used. If it is used, we will
		 * exahust the search in the hash list corresponding
		 * to the port number (snum) - we detect that with the
		 * port iterator, pp being NULL.
		 */
7393
		head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7394
		spin_lock(&head->lock);
7395
		sctp_for_each_hentry(pp, &head->chain) {
7396
			if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
L
Linus Torvalds 已提交
7397 7398 7399 7400 7401 7402 7403 7404 7405 7406 7407 7408 7409 7410 7411
				goto pp_found;
		}
	}
	pp = NULL;
	goto pp_not_found;
pp_found:
	if (!hlist_empty(&pp->owner)) {
		/* We had a port hash table hit - there is an
		 * available port (pp != NULL) and it is being
		 * used by other socket (pp->owner not empty); that other
		 * socket is going to be sk2.
		 */
		int reuse = sk->sk_reuse;
		struct sock *sk2;

7412 7413
		pr_debug("%s: found a possible match\n", __func__);

7414 7415
		if (pp->fastreuse && sk->sk_reuse &&
			sk->sk_state != SCTP_SS_LISTENING)
L
Linus Torvalds 已提交
7416 7417 7418 7419 7420 7421 7422 7423 7424 7425 7426 7427
			goto success;

		/* Run through the list of sockets bound to the port
		 * (pp->port) [via the pointers bind_next and
		 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
		 * we get the endpoint they describe and run through
		 * the endpoint's list of IP (v4 or v6) addresses,
		 * comparing each of the addresses with the address of
		 * the socket sk. If we find a match, then that means
		 * that this port/socket (sk) combination are already
		 * in an endpoint.
		 */
7428
		sk_for_each_bound(sk2, &pp->owner) {
L
Linus Torvalds 已提交
7429 7430 7431
			struct sctp_endpoint *ep2;
			ep2 = sctp_sk(sk2)->ep;

7432 7433 7434
			if (sk == sk2 ||
			    (reuse && sk2->sk_reuse &&
			     sk2->sk_state != SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
7435 7436
				continue;

7437 7438
			if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
						 sctp_sk(sk2), sctp_sk(sk))) {
L
Linus Torvalds 已提交
7439 7440 7441 7442
				ret = (long)sk2;
				goto fail_unlock;
			}
		}
7443 7444

		pr_debug("%s: found a match\n", __func__);
L
Linus Torvalds 已提交
7445 7446 7447 7448
	}
pp_not_found:
	/* If there was a hash table miss, create a new port.  */
	ret = 1;
7449
	if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
L
Linus Torvalds 已提交
7450 7451 7452 7453 7454 7455
		goto fail_unlock;

	/* In either case (hit or miss), make sure fastreuse is 1 only
	 * if sk->sk_reuse is too (that is, if the caller requested
	 * SO_REUSEADDR on this socket -sk-).
	 */
7456 7457 7458 7459 7460 7461 7462
	if (hlist_empty(&pp->owner)) {
		if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
			pp->fastreuse = 1;
		else
			pp->fastreuse = 0;
	} else if (pp->fastreuse &&
		(!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
7463 7464 7465 7466 7467 7468 7469 7470
		pp->fastreuse = 0;

	/* We are set, so fill up all the data in the hash table
	 * entry, tie the socket list information with the rest of the
	 * sockets FIXME: Blurry, NPI (ipg).
	 */
success:
	if (!sctp_sk(sk)->bind_hash) {
E
Eric Dumazet 已提交
7471
		inet_sk(sk)->inet_num = snum;
L
Linus Torvalds 已提交
7472 7473 7474 7475 7476 7477
		sk_add_bind_node(sk, &pp->owner);
		sctp_sk(sk)->bind_hash = pp;
	}
	ret = 0;

fail_unlock:
7478
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7479 7480

fail:
7481
	local_bh_enable();
L
Linus Torvalds 已提交
7482 7483 7484 7485 7486 7487 7488 7489 7490 7491 7492 7493 7494 7495 7496 7497
	return ret;
}

/* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
 * port is requested.
 */
static int sctp_get_port(struct sock *sk, unsigned short snum)
{
	union sctp_addr addr;
	struct sctp_af *af = sctp_sk(sk)->pf->af;

	/* Set up a dummy address struct from the sk. */
	af->from_sk(&addr, sk);
	addr.v4.sin_port = htons(snum);

	/* Note: sk->sk_num gets filled in if ephemeral port request. */
7498
	return !!sctp_get_port_local(sk, &addr);
L
Linus Torvalds 已提交
7499 7500 7501
}

/*
7502
 *  Move a socket to LISTENING state.
L
Linus Torvalds 已提交
7503
 */
7504
static int sctp_listen_start(struct sock *sk, int backlog)
L
Linus Torvalds 已提交
7505 7506 7507
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
H
Herbert Xu 已提交
7508
	struct crypto_shash *tfm = NULL;
7509
	char alg[32];
L
Linus Torvalds 已提交
7510

7511
	/* Allocate HMAC for generating cookie. */
7512 7513
	if (!sp->hmac && sp->sctp_hmac_alg) {
		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
H
Herbert Xu 已提交
7514
		tfm = crypto_alloc_shash(alg, 0, 0);
7515
		if (IS_ERR(tfm)) {
7516
			net_info_ratelimited("failed to load transform for %s: %ld\n",
7517
					     sp->sctp_hmac_alg, PTR_ERR(tfm));
7518 7519 7520
			return -ENOSYS;
		}
		sctp_sk(sk)->hmac = tfm;
L
Linus Torvalds 已提交
7521 7522 7523 7524 7525 7526 7527 7528 7529 7530 7531
	}

	/*
	 * If a bind() or sctp_bindx() is not called prior to a listen()
	 * call that allows new associations to be accepted, the system
	 * picks an ephemeral port and will choose an address set equivalent
	 * to binding with a wildcard address.
	 *
	 * This is not currently spelled out in the SCTP sockets
	 * extensions draft, but follows the practice as seen in TCP
	 * sockets.
7532
	 *
L
Linus Torvalds 已提交
7533
	 */
7534
	inet_sk_set_state(sk, SCTP_SS_LISTENING);
L
Linus Torvalds 已提交
7535 7536 7537
	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
7538
	} else {
E
Eric Dumazet 已提交
7539
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7540
			inet_sk_set_state(sk, SCTP_SS_CLOSED);
7541 7542 7543
			return -EADDRINUSE;
		}
	}
7544

L
Linus Torvalds 已提交
7545 7546 7547 7548 7549 7550
	sk->sk_max_ack_backlog = backlog;
	sctp_hash_endpoint(ep);
	return 0;
}

/*
7551 7552 7553 7554 7555 7556 7557 7558 7559 7560 7561
 * 4.1.3 / 5.1.3 listen()
 *
 *   By default, new associations are not accepted for UDP style sockets.
 *   An application uses listen() to mark a socket as being able to
 *   accept new associations.
 *
 *   On TCP style sockets, applications use listen() to ready the SCTP
 *   endpoint for accepting inbound associations.
 *
 *   On both types of endpoints a backlog of '0' disables listening.
 *
L
Linus Torvalds 已提交
7562 7563 7564 7565 7566
 *  Move a socket to LISTENING state.
 */
int sctp_inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
7567
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
L
Linus Torvalds 已提交
7568 7569 7570
	int err = -EINVAL;

	if (unlikely(backlog < 0))
7571
		return err;
L
Linus Torvalds 已提交
7572

7573
	lock_sock(sk);
L
Linus Torvalds 已提交
7574

7575 7576 7577 7578
	/* Peeled-off sockets are not allowed to listen().  */
	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
		goto out;

L
Linus Torvalds 已提交
7579 7580 7581
	if (sock->state != SS_UNCONNECTED)
		goto out;

7582 7583 7584
	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
		goto out;

7585 7586 7587
	/* If backlog is zero, disable listening. */
	if (!backlog) {
		if (sctp_sstate(sk, CLOSED))
L
Linus Torvalds 已提交
7588 7589
			goto out;

7590 7591 7592 7593 7594 7595
		err = 0;
		sctp_unhash_endpoint(ep);
		sk->sk_state = SCTP_SS_CLOSED;
		if (sk->sk_reuse)
			sctp_sk(sk)->bind_hash->fastreuse = 1;
		goto out;
7596 7597
	}

7598 7599 7600 7601 7602 7603 7604 7605
	/* If we are already listening, just update the backlog */
	if (sctp_sstate(sk, LISTENING))
		sk->sk_max_ack_backlog = backlog;
	else {
		err = sctp_listen_start(sk, backlog);
		if (err)
			goto out;
	}
L
Linus Torvalds 已提交
7606

7607
	err = 0;
L
Linus Torvalds 已提交
7608
out:
7609
	release_sock(sk);
L
Linus Torvalds 已提交
7610 7611 7612 7613 7614 7615 7616 7617
	return err;
}

/*
 * This function is done by modeling the current datagram_poll() and the
 * tcp_poll().  Note that, based on these implementations, we don't
 * lock the socket in this function, even though it seems that,
 * ideally, locking or some other mechanisms can be used to ensure
7618
 * the integrity of the counters (sndbuf and wmem_alloc) used
L
Linus Torvalds 已提交
7619 7620 7621 7622 7623 7624 7625 7626 7627 7628 7629 7630 7631
 * in this place.  We assume that we don't need locks either until proven
 * otherwise.
 *
 * Another thing to note is that we include the Async I/O support
 * here, again, by modeling the current TCP/UDP code.  We don't have
 * a good way to test with it yet.
 */
unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
{
	struct sock *sk = sock->sk;
	struct sctp_sock *sp = sctp_sk(sk);
	unsigned int mask;

E
Eric Dumazet 已提交
7632
	poll_wait(file, sk_sleep(sk), wait);
L
Linus Torvalds 已提交
7633

7634 7635
	sock_rps_record_flow(sk);

L
Linus Torvalds 已提交
7636 7637 7638 7639 7640
	/* A TCP-style listening socket becomes readable when the accept queue
	 * is not empty.
	 */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
		return (!list_empty(&sp->ep->asocs)) ?
7641
			(POLLIN | POLLRDNORM) : 0;
L
Linus Torvalds 已提交
7642 7643 7644 7645 7646

	mask = 0;

	/* Is there any exceptional events?  */
	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7647
		mask |= POLLERR |
7648
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
7649
	if (sk->sk_shutdown & RCV_SHUTDOWN)
E
Eric Dumazet 已提交
7650
		mask |= POLLRDHUP | POLLIN | POLLRDNORM;
L
Linus Torvalds 已提交
7651 7652 7653 7654
	if (sk->sk_shutdown == SHUTDOWN_MASK)
		mask |= POLLHUP;

	/* Is it readable?  Reconsider this code with TCP-style support.  */
E
Eric Dumazet 已提交
7655
	if (!skb_queue_empty(&sk->sk_receive_queue))
L
Linus Torvalds 已提交
7656 7657 7658 7659 7660 7661 7662 7663 7664 7665
		mask |= POLLIN | POLLRDNORM;

	/* The association is either gone or not ready.  */
	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
		return mask;

	/* Is it writable?  */
	if (sctp_writeable(sk)) {
		mask |= POLLOUT | POLLWRNORM;
	} else {
7666
		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
L
Linus Torvalds 已提交
7667 7668 7669 7670 7671 7672 7673 7674 7675 7676 7677 7678 7679 7680 7681 7682 7683 7684 7685
		/*
		 * Since the socket is not locked, the buffer
		 * might be made available after the writeable check and
		 * before the bit is set.  This could cause a lost I/O
		 * signal.  tcp_poll() has a race breaker for this race
		 * condition.  Based on their implementation, we put
		 * in the following code to cover it as well.
		 */
		if (sctp_writeable(sk))
			mask |= POLLOUT | POLLWRNORM;
	}
	return mask;
}

/********************************************************************
 * 2nd Level Abstractions
 ********************************************************************/

static struct sctp_bind_bucket *sctp_bucket_create(
7686
	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
L
Linus Torvalds 已提交
7687 7688 7689
{
	struct sctp_bind_bucket *pp;

7690
	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
L
Linus Torvalds 已提交
7691
	if (pp) {
7692
		SCTP_DBG_OBJCNT_INC(bind_bucket);
L
Linus Torvalds 已提交
7693 7694 7695
		pp->port = snum;
		pp->fastreuse = 0;
		INIT_HLIST_HEAD(&pp->owner);
7696
		pp->net = net;
7697
		hlist_add_head(&pp->node, &head->chain);
L
Linus Torvalds 已提交
7698 7699 7700 7701 7702 7703 7704
	}
	return pp;
}

/* Caller must hold hashbucket lock for this tb with local BH disabled */
static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
{
7705
	if (pp && hlist_empty(&pp->owner)) {
7706
		__hlist_del(&pp->node);
L
Linus Torvalds 已提交
7707 7708 7709 7710 7711 7712 7713 7714 7715
		kmem_cache_free(sctp_bucket_cachep, pp);
		SCTP_DBG_OBJCNT_DEC(bind_bucket);
	}
}

/* Release this socket's reference to a local port.  */
static inline void __sctp_put_port(struct sock *sk)
{
	struct sctp_bind_hashbucket *head =
7716 7717
		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
						  inet_sk(sk)->inet_num)];
L
Linus Torvalds 已提交
7718 7719
	struct sctp_bind_bucket *pp;

7720
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
7721 7722 7723
	pp = sctp_sk(sk)->bind_hash;
	__sk_del_bind_node(sk);
	sctp_sk(sk)->bind_hash = NULL;
E
Eric Dumazet 已提交
7724
	inet_sk(sk)->inet_num = 0;
L
Linus Torvalds 已提交
7725
	sctp_bucket_destroy(pp);
7726
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7727 7728 7729 7730
}

void sctp_put_port(struct sock *sk)
{
7731
	local_bh_disable();
L
Linus Torvalds 已提交
7732
	__sctp_put_port(sk);
7733
	local_bh_enable();
L
Linus Torvalds 已提交
7734 7735 7736 7737 7738 7739 7740 7741 7742 7743 7744 7745
}

/*
 * The system picks an ephemeral port and choose an address set equivalent
 * to binding with a wildcard address.
 * One of those addresses will be the primary address for the association.
 * This automatically enables the multihoming capability of SCTP.
 */
static int sctp_autobind(struct sock *sk)
{
	union sctp_addr autoaddr;
	struct sctp_af *af;
A
Al Viro 已提交
7746
	__be16 port;
L
Linus Torvalds 已提交
7747 7748 7749 7750

	/* Initialize a local sockaddr structure to INADDR_ANY. */
	af = sctp_sk(sk)->pf->af;

E
Eric Dumazet 已提交
7751
	port = htons(inet_sk(sk)->inet_num);
L
Linus Torvalds 已提交
7752 7753 7754 7755 7756 7757 7758 7759 7760 7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772 7773 7774 7775 7776 7777 7778 7779 7780 7781 7782 7783 7784 7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795
	af->inaddr_any(&autoaddr, port);

	return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
}

/* Parse out IPPROTO_SCTP CMSG headers.  Perform only minimal validation.
 *
 * From RFC 2292
 * 4.2 The cmsghdr Structure *
 *
 * When ancillary data is sent or received, any number of ancillary data
 * objects can be specified by the msg_control and msg_controllen members of
 * the msghdr structure, because each object is preceded by
 * a cmsghdr structure defining the object's length (the cmsg_len member).
 * Historically Berkeley-derived implementations have passed only one object
 * at a time, but this API allows multiple objects to be
 * passed in a single call to sendmsg() or recvmsg(). The following example
 * shows two ancillary data objects in a control buffer.
 *
 *   |<--------------------------- msg_controllen -------------------------->|
 *   |                                                                       |
 *
 *   |<----- ancillary data object ----->|<----- ancillary data object ----->|
 *
 *   |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
 *   |                                   |                                   |
 *
 *   |<---------- cmsg_len ---------->|  |<--------- cmsg_len ----------->|  |
 *
 *   |<--------- CMSG_LEN() --------->|  |<-------- CMSG_LEN() ---------->|  |
 *   |                                |  |                                |  |
 *
 *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
 *   |cmsg_|cmsg_|cmsg_|XX|           |XX|cmsg_|cmsg_|cmsg_|XX|           |XX|
 *
 *   |len  |level|type |XX|cmsg_data[]|XX|len  |level|type |XX|cmsg_data[]|XX|
 *
 *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
 *    ^
 *    |
 *
 * msg_control
 * points here
 */
X
Xin Long 已提交
7796
static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
L
Linus Torvalds 已提交
7797
{
7798
	struct msghdr *my_msg = (struct msghdr *)msg;
X
Xin Long 已提交
7799
	struct cmsghdr *cmsg;
L
Linus Torvalds 已提交
7800

7801
	for_each_cmsghdr(cmsg, my_msg) {
7802
		if (!CMSG_OK(my_msg, cmsg))
L
Linus Torvalds 已提交
7803 7804 7805 7806 7807 7808 7809 7810 7811 7812
			return -EINVAL;

		/* Should we parse this header or ignore?  */
		if (cmsg->cmsg_level != IPPROTO_SCTP)
			continue;

		/* Strictly check lengths following example in SCM code.  */
		switch (cmsg->cmsg_type) {
		case SCTP_INIT:
			/* SCTP Socket API Extension
7813
			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
L
Linus Torvalds 已提交
7814 7815 7816 7817 7818 7819 7820 7821 7822 7823 7824
			 *
			 * This cmsghdr structure provides information for
			 * initializing new SCTP associations with sendmsg().
			 * The SCTP_INITMSG socket option uses this same data
			 * structure.  This structure is not used for
			 * recvmsg().
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ----------------------
			 * IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
			 */
7825
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
L
Linus Torvalds 已提交
7826
				return -EINVAL;
7827 7828

			cmsgs->init = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7829 7830 7831 7832
			break;

		case SCTP_SNDRCV:
			/* SCTP Socket API Extension
7833
			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
L
Linus Torvalds 已提交
7834 7835 7836 7837 7838 7839 7840 7841 7842
			 *
			 * This cmsghdr structure specifies SCTP options for
			 * sendmsg() and describes SCTP header information
			 * about a received message through recvmsg().
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ----------------------
			 * IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
			 */
7843
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
L
Linus Torvalds 已提交
7844 7845
				return -EINVAL;

7846
			cmsgs->srinfo = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7847

7848
			if (cmsgs->srinfo->sinfo_flags &
7849
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
X
Xin Long 已提交
7850
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7851
			      SCTP_ABORT | SCTP_EOF))
L
Linus Torvalds 已提交
7852 7853 7854
				return -EINVAL;
			break;

7855 7856 7857 7858 7859 7860 7861 7862 7863 7864 7865 7866 7867 7868 7869 7870 7871 7872 7873
		case SCTP_SNDINFO:
			/* SCTP Socket API Extension
			 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
			 *
			 * This cmsghdr structure specifies SCTP options for
			 * sendmsg(). This structure and SCTP_RCVINFO replaces
			 * SCTP_SNDRCV which has been deprecated.
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ---------------------
			 * IPPROTO_SCTP  SCTP_SNDINFO    struct sctp_sndinfo
			 */
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
				return -EINVAL;

			cmsgs->sinfo = CMSG_DATA(cmsg);

			if (cmsgs->sinfo->snd_flags &
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
X
Xin Long 已提交
7874
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7875 7876 7877
			      SCTP_ABORT | SCTP_EOF))
				return -EINVAL;
			break;
L
Linus Torvalds 已提交
7878 7879
		default:
			return -EINVAL;
7880
		}
L
Linus Torvalds 已提交
7881
	}
7882

L
Linus Torvalds 已提交
7883 7884 7885 7886 7887 7888 7889 7890
	return 0;
}

/*
 * Wait for a packet..
 * Note: This function is the same function as in core/datagram.c
 * with a few modifications to make lksctp work.
 */
7891
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
L
Linus Torvalds 已提交
7892 7893 7894 7895
{
	int error;
	DEFINE_WAIT(wait);

E
Eric Dumazet 已提交
7896
	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7897 7898 7899 7900 7901 7902 7903 7904 7905 7906 7907 7908 7909 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 7921 7922 7923 7924 7925 7926 7927

	/* Socket errors? */
	error = sock_error(sk);
	if (error)
		goto out;

	if (!skb_queue_empty(&sk->sk_receive_queue))
		goto ready;

	/* Socket shut down?  */
	if (sk->sk_shutdown & RCV_SHUTDOWN)
		goto out;

	/* Sequenced packets can come disconnected.  If so we report the
	 * problem.
	 */
	error = -ENOTCONN;

	/* Is there a good reason to think that we may receive some data?  */
	if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
		goto out;

	/* Handle signals.  */
	if (signal_pending(current))
		goto interrupted;

	/* Let another process have a go.  Since we are going to sleep
	 * anyway.  Note: This may cause odd behaviors if the message
	 * does not fit in the user's buffer, but this seems to be the
	 * only way to honor MSG_DONTWAIT realistically.
	 */
7928
	release_sock(sk);
L
Linus Torvalds 已提交
7929
	*timeo_p = schedule_timeout(*timeo_p);
7930
	lock_sock(sk);
L
Linus Torvalds 已提交
7931 7932

ready:
E
Eric Dumazet 已提交
7933
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7934 7935 7936 7937 7938 7939
	return 0;

interrupted:
	error = sock_intr_errno(*timeo_p);

out:
E
Eric Dumazet 已提交
7940
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7941 7942 7943 7944 7945 7946 7947 7948
	*err = error;
	return error;
}

/* Receive a datagram.
 * Note: This is pretty much the same routine as in core/datagram.c
 * with a few changes to make lksctp work.
 */
7949 7950
struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
				       int noblock, int *err)
L
Linus Torvalds 已提交
7951 7952 7953 7954 7955 7956 7957
{
	int error;
	struct sk_buff *skb;
	long timeo;

	timeo = sock_rcvtimeo(sk, noblock);

7958 7959
	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
		 MAX_SCHEDULE_TIMEOUT);
L
Linus Torvalds 已提交
7960 7961 7962 7963 7964 7965 7966

	do {
		/* Again only user level code calls this function,
		 * so nothing interrupt level
		 * will suddenly eat the receive_queue.
		 *
		 *  Look at current nfs client by the way...
7967
		 *  However, this function was correct in any case. 8)
L
Linus Torvalds 已提交
7968 7969 7970 7971
		 */
		if (flags & MSG_PEEK) {
			skb = skb_peek(&sk->sk_receive_queue);
			if (skb)
7972
				refcount_inc(&skb->users);
L
Linus Torvalds 已提交
7973
		} else {
7974
			skb = __skb_dequeue(&sk->sk_receive_queue);
L
Linus Torvalds 已提交
7975 7976 7977 7978 7979
		}

		if (skb)
			return skb;

7980 7981 7982 7983 7984
		/* Caller is allowed not to check sk->sk_err before calling. */
		error = sock_error(sk);
		if (error)
			goto no_packet;

L
Linus Torvalds 已提交
7985 7986 7987
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;

7988 7989 7990 7991 7992 7993
		if (sk_can_busy_loop(sk)) {
			sk_busy_loop(sk, noblock);

			if (!skb_queue_empty(&sk->sk_receive_queue))
				continue;
		}
7994

L
Linus Torvalds 已提交
7995 7996 7997 7998 7999 8000 8001 8002 8003 8004 8005 8006 8007 8008 8009 8010 8011 8012
		/* User doesn't want to wait.  */
		error = -EAGAIN;
		if (!timeo)
			goto no_packet;
	} while (sctp_wait_for_packet(sk, err, &timeo) == 0);

	return NULL;

no_packet:
	*err = error;
	return NULL;
}

/* If sndbuf has changed, wake up per association sndbuf waiters.  */
static void __sctp_write_space(struct sctp_association *asoc)
{
	struct sock *sk = asoc->base.sk;

8013 8014 8015 8016 8017
	if (sctp_wspace(asoc) <= 0)
		return;

	if (waitqueue_active(&asoc->wait))
		wake_up_interruptible(&asoc->wait);
L
Linus Torvalds 已提交
8018

8019 8020
	if (sctp_writeable(sk)) {
		struct socket_wq *wq;
8021

8022 8023 8024 8025 8026
		rcu_read_lock();
		wq = rcu_dereference(sk->sk_wq);
		if (wq) {
			if (waitqueue_active(&wq->wait))
				wake_up_interruptible(&wq->wait);
L
Linus Torvalds 已提交
8027 8028 8029 8030 8031

			/* Note that we try to include the Async I/O support
			 * here by modeling from the current TCP/UDP code.
			 * We have not tested with it yet.
			 */
8032
			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8033
				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
8034
		}
8035
		rcu_read_unlock();
L
Linus Torvalds 已提交
8036 8037 8038
	}
}

8039 8040 8041 8042 8043 8044 8045 8046 8047 8048 8049
static void sctp_wake_up_waiters(struct sock *sk,
				 struct sctp_association *asoc)
{
	struct sctp_association *tmp = asoc;

	/* We do accounting for the sndbuf space per association,
	 * so we only need to wake our own association.
	 */
	if (asoc->ep->sndbuf_policy)
		return __sctp_write_space(asoc);

8050 8051 8052 8053 8054 8055
	/* If association goes down and is just flushing its
	 * outq, then just normally notify others.
	 */
	if (asoc->base.dead)
		return sctp_write_space(sk);

8056 8057 8058 8059 8060 8061 8062 8063 8064 8065 8066 8067 8068 8069 8070 8071 8072 8073 8074 8075 8076 8077 8078
	/* Accounting for the sndbuf space is per socket, so we
	 * need to wake up others, try to be fair and in case of
	 * other associations, let them have a go first instead
	 * of just doing a sctp_write_space() call.
	 *
	 * Note that we reach sctp_wake_up_waiters() only when
	 * associations free up queued chunks, thus we are under
	 * lock and the list of associations on a socket is
	 * guaranteed not to change.
	 */
	for (tmp = list_next_entry(tmp, asocs); 1;
	     tmp = list_next_entry(tmp, asocs)) {
		/* Manually skip the head element. */
		if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
			continue;
		/* Wake up association. */
		__sctp_write_space(tmp);
		/* We've reached the end. */
		if (tmp == asoc)
			break;
	}
}

L
Linus Torvalds 已提交
8079 8080 8081 8082 8083 8084
/* Do accounting for the sndbuf space.
 * Decrement the used sndbuf space of the corresponding association by the
 * data size which was just transmitted(freed).
 */
static void sctp_wfree(struct sk_buff *skb)
{
8085 8086 8087
	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
	struct sctp_association *asoc = chunk->asoc;
	struct sock *sk = asoc->base.sk;
L
Linus Torvalds 已提交
8088

8089 8090 8091 8092
	asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

8093
	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
8094

8095
	/*
8096
	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
8097 8098
	 */
	sk->sk_wmem_queued   -= skb->truesize;
8099
	sk_mem_uncharge(sk, skb->truesize);
8100

8101
	sock_wfree(skb);
8102
	sctp_wake_up_waiters(sk, asoc);
L
Linus Torvalds 已提交
8103 8104 8105 8106

	sctp_association_put(asoc);
}

8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117
/* Do accounting for the receive space on the socket.
 * Accounting for the association is done in ulpevent.c
 * We set this as a destructor for the cloned data skbs so that
 * accounting is done at the correct time.
 */
void sctp_sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
	struct sctp_ulpevent *event = sctp_skb2event(skb);

	atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8118 8119

	/*
8120
	 * Mimic the behavior of sock_rfree
8121
	 */
8122
	sk_mem_uncharge(sk, event->rmem_len);
8123 8124 8125
}


L
Linus Torvalds 已提交
8126 8127
/* Helper function to wait for space in the sndbuf.  */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8128
				size_t msg_len)
L
Linus Torvalds 已提交
8129 8130 8131 8132
{
	struct sock *sk = asoc->base.sk;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);
8133
	int err = 0;
L
Linus Torvalds 已提交
8134

8135 8136
	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
		 *timeo_p, msg_len);
L
Linus Torvalds 已提交
8137 8138 8139 8140 8141 8142 8143 8144

	/* Increment the association's refcnt.  */
	sctp_association_hold(asoc);

	/* Wait on the association specific sndbuf space. */
	for (;;) {
		prepare_to_wait_exclusive(&asoc->wait, &wait,
					  TASK_INTERRUPTIBLE);
8145 8146
		if (asoc->base.dead)
			goto do_dead;
L
Linus Torvalds 已提交
8147 8148
		if (!*timeo_p)
			goto do_nonblock;
8149
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
L
Linus Torvalds 已提交
8150 8151 8152 8153 8154 8155 8156 8157 8158
			goto do_error;
		if (signal_pending(current))
			goto do_interrupted;
		if (msg_len <= sctp_wspace(asoc))
			break;

		/* Let another process have a go.  Since we are going
		 * to sleep anyway.
		 */
8159
		release_sock(sk);
L
Linus Torvalds 已提交
8160
		current_timeo = schedule_timeout(current_timeo);
8161
		lock_sock(sk);
8162 8163
		if (sk != asoc->base.sk)
			goto do_error;
L
Linus Torvalds 已提交
8164 8165 8166 8167 8168 8169 8170 8171 8172 8173 8174 8175

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

8176 8177 8178 8179
do_dead:
	err = -ESRCH;
	goto out;

L
Linus Torvalds 已提交
8180 8181 8182 8183 8184 8185 8186 8187 8188 8189 8190 8191 8192
do_error:
	err = -EPIPE;
	goto out;

do_interrupted:
	err = sock_intr_errno(*timeo_p);
	goto out;

do_nonblock:
	err = -EAGAIN;
	goto out;
}

8193
void sctp_data_ready(struct sock *sk)
8194
{
8195 8196 8197 8198
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
H
Herbert Xu 已提交
8199
	if (skwq_has_sleeper(wq))
8200
		wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
8201 8202
						POLLRDNORM | POLLRDBAND);
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8203
	rcu_read_unlock();
8204 8205
}

L
Linus Torvalds 已提交
8206 8207 8208 8209 8210 8211
/* If socket sndbuf has changed, wake up all per association waiters.  */
void sctp_write_space(struct sock *sk)
{
	struct sctp_association *asoc;

	/* Wake up the tasks in each wait queue.  */
8212
	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
L
Linus Torvalds 已提交
8213 8214 8215 8216 8217 8218
		__sctp_write_space(asoc);
	}
}

/* Is there any sndbuf space available on the socket?
 *
8219
 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
L
Linus Torvalds 已提交
8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 8230 8231
 * associations on the same socket.  For a UDP-style socket with
 * multiple associations, it is possible for it to be "unwriteable"
 * prematurely.  I assume that this is acceptable because
 * a premature "unwriteable" is better than an accidental "writeable" which
 * would cause an unwanted block under certain circumstances.  For the 1-1
 * UDP-style sockets or TCP-style sockets, this code should work.
 *  - Daisy
 */
static int sctp_writeable(struct sock *sk)
{
	int amt = 0;

8232
	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
L
Linus Torvalds 已提交
8233 8234 8235 8236 8237 8238 8239 8240 8241 8242 8243 8244 8245 8246 8247
	if (amt < 0)
		amt = 0;
	return amt;
}

/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
 * returns immediately with EINPROGRESS.
 */
static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
{
	struct sock *sk = asoc->base.sk;
	int err = 0;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);

8248
	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
L
Linus Torvalds 已提交
8249 8250 8251 8252 8253 8254 8255 8256 8257 8258 8259 8260 8261 8262 8263 8264 8265 8266 8267 8268 8269 8270 8271

	/* Increment the association's refcnt.  */
	sctp_association_hold(asoc);

	for (;;) {
		prepare_to_wait_exclusive(&asoc->wait, &wait,
					  TASK_INTERRUPTIBLE);
		if (!*timeo_p)
			goto do_nonblock;
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
		    asoc->base.dead)
			goto do_error;
		if (signal_pending(current))
			goto do_interrupted;

		if (sctp_state(asoc, ESTABLISHED))
			break;

		/* Let another process have a go.  Since we are going
		 * to sleep anyway.
		 */
8272
		release_sock(sk);
L
Linus Torvalds 已提交
8273
		current_timeo = schedule_timeout(current_timeo);
8274
		lock_sock(sk);
L
Linus Torvalds 已提交
8275 8276 8277 8278 8279 8280 8281 8282 8283 8284 8285 8286 8287

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

do_error:
8288
	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
L
Linus Torvalds 已提交
8289 8290 8291 8292 8293 8294 8295 8296 8297 8298 8299 8300 8301 8302 8303 8304 8305 8306 8307 8308 8309 8310 8311 8312
		err = -ETIMEDOUT;
	else
		err = -ECONNREFUSED;
	goto out;

do_interrupted:
	err = sock_intr_errno(*timeo_p);
	goto out;

do_nonblock:
	err = -EINPROGRESS;
	goto out;
}

static int sctp_wait_for_accept(struct sock *sk, long timeo)
{
	struct sctp_endpoint *ep;
	int err = 0;
	DEFINE_WAIT(wait);

	ep = sctp_sk(sk)->ep;


	for (;;) {
E
Eric Dumazet 已提交
8313
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
L
Linus Torvalds 已提交
8314 8315 8316
					  TASK_INTERRUPTIBLE);

		if (list_empty(&ep->asocs)) {
8317
			release_sock(sk);
L
Linus Torvalds 已提交
8318
			timeo = schedule_timeout(timeo);
8319
			lock_sock(sk);
L
Linus Torvalds 已提交
8320 8321 8322 8323 8324 8325 8326 8327 8328 8329 8330 8331 8332 8333 8334 8335 8336 8337 8338
		}

		err = -EINVAL;
		if (!sctp_sstate(sk, LISTENING))
			break;

		err = 0;
		if (!list_empty(&ep->asocs))
			break;

		err = sock_intr_errno(timeo);
		if (signal_pending(current))
			break;

		err = -EAGAIN;
		if (!timeo)
			break;
	}

E
Eric Dumazet 已提交
8339
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8340 8341 8342 8343

	return err;
}

8344
static void sctp_wait_for_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
8345 8346 8347 8348
{
	DEFINE_WAIT(wait);

	do {
E
Eric Dumazet 已提交
8349
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
8350 8351
		if (list_empty(&sctp_sk(sk)->ep->asocs))
			break;
8352
		release_sock(sk);
L
Linus Torvalds 已提交
8353
		timeout = schedule_timeout(timeout);
8354
		lock_sock(sk);
L
Linus Torvalds 已提交
8355 8356
	} while (!signal_pending(current) && timeout);

E
Eric Dumazet 已提交
8357
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8358 8359
}

8360 8361 8362 8363 8364 8365 8366 8367
static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
{
	struct sk_buff *frag;

	if (!skb->data_len)
		goto done;

	/* Don't forget the fragments. */
8368
	skb_walk_frags(skb, frag)
8369 8370 8371 8372 8373 8374
		sctp_skb_set_owner_r_frag(frag, sk);

done:
	sctp_skb_set_owner_r(skb, sk);
}

8375 8376 8377 8378
void sctp_copy_sock(struct sock *newsk, struct sock *sk,
		    struct sctp_association *asoc)
{
	struct inet_sock *inet = inet_sk(sk);
J
Julia Lawall 已提交
8379
	struct inet_sock *newinet;
8380 8381 8382 8383

	newsk->sk_type = sk->sk_type;
	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
	newsk->sk_flags = sk->sk_flags;
8384
	newsk->sk_tsflags = sk->sk_tsflags;
8385 8386
	newsk->sk_no_check_tx = sk->sk_no_check_tx;
	newsk->sk_no_check_rx = sk->sk_no_check_rx;
8387 8388 8389
	newsk->sk_reuse = sk->sk_reuse;

	newsk->sk_shutdown = sk->sk_shutdown;
8390
	newsk->sk_destruct = sctp_destruct_sock;
8391 8392 8393 8394 8395 8396 8397 8398
	newsk->sk_family = sk->sk_family;
	newsk->sk_protocol = IPPROTO_SCTP;
	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
	newsk->sk_sndbuf = sk->sk_sndbuf;
	newsk->sk_rcvbuf = sk->sk_rcvbuf;
	newsk->sk_lingertime = sk->sk_lingertime;
	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
	newsk->sk_sndtimeo = sk->sk_sndtimeo;
8399
	newsk->sk_rxhash = sk->sk_rxhash;
8400 8401 8402 8403 8404 8405

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
E
Eric Dumazet 已提交
8406 8407 8408 8409
	newinet->inet_sport = inet->inet_sport;
	newinet->inet_saddr = inet->inet_saddr;
	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
	newinet->inet_dport = htons(asoc->peer.port);
8410
	newinet->pmtudisc = inet->pmtudisc;
E
Eric Dumazet 已提交
8411
	newinet->inet_id = asoc->next_tsn ^ jiffies;
8412 8413 8414 8415 8416 8417

	newinet->uc_ttl = inet->uc_ttl;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;
8418 8419 8420

	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
		net_enable_timestamp();
8421 8422

	security_sk_clone(sk, newsk);
8423 8424
}

8425 8426 8427 8428 8429 8430 8431 8432 8433 8434 8435 8436 8437
static inline void sctp_copy_descendant(struct sock *sk_to,
					const struct sock *sk_from)
{
	int ancestor_size = sizeof(struct inet_sock) +
			    sizeof(struct sctp_sock) -
			    offsetof(struct sctp_sock, auto_asconf_list);

	if (sk_from->sk_family == PF_INET6)
		ancestor_size += sizeof(struct ipv6_pinfo);

	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
}

L
Linus Torvalds 已提交
8438 8439 8440 8441 8442
/* Populate the fields of the newsk from the oldsk and migrate the assoc
 * and its messages to the newsk.
 */
static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
			      struct sctp_association *assoc,
8443
			      enum sctp_socket_type type)
L
Linus Torvalds 已提交
8444 8445 8446 8447 8448 8449 8450
{
	struct sctp_sock *oldsp = sctp_sk(oldsk);
	struct sctp_sock *newsp = sctp_sk(newsk);
	struct sctp_bind_bucket *pp; /* hash list port iterator */
	struct sctp_endpoint *newep = newsp->ep;
	struct sk_buff *skb, *tmp;
	struct sctp_ulpevent *event;
8451
	struct sctp_bind_hashbucket *head;
L
Linus Torvalds 已提交
8452 8453 8454 8455 8456 8457 8458

	/* Migrate socket buffer sizes and all the socket level options to the
	 * new socket.
	 */
	newsk->sk_sndbuf = oldsk->sk_sndbuf;
	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
	/* Brute force copy old sctp opt. */
8459
	sctp_copy_descendant(newsk, oldsk);
L
Linus Torvalds 已提交
8460 8461 8462 8463 8464 8465 8466 8467

	/* Restore the ep value that was overwritten with the above structure
	 * copy.
	 */
	newsp->ep = newep;
	newsp->hmac = NULL;

	/* Hook this new socket in to the bind_hash list. */
8468 8469
	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
						 inet_sk(oldsk)->inet_num)];
8470
	spin_lock_bh(&head->lock);
L
Linus Torvalds 已提交
8471 8472 8473
	pp = sctp_sk(oldsk)->bind_hash;
	sk_add_bind_node(newsk, &pp->owner);
	sctp_sk(newsk)->bind_hash = pp;
E
Eric Dumazet 已提交
8474
	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8475
	spin_unlock_bh(&head->lock);
L
Linus Torvalds 已提交
8476

8477 8478 8479
	/* Copy the bind_addr list from the original endpoint to the new
	 * endpoint so that we can handle restarts properly
	 */
8480 8481
	sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
				&oldsp->ep->base.bind_addr, GFP_KERNEL);
8482

L
Linus Torvalds 已提交
8483 8484 8485 8486 8487 8488
	/* Move any messages in the old socket's receive queue that are for the
	 * peeled off association to the new socket's receive queue.
	 */
	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
		event = sctp_skb2event(skb);
		if (event->asoc == assoc) {
D
David S. Miller 已提交
8489
			__skb_unlink(skb, &oldsk->sk_receive_queue);
L
Linus Torvalds 已提交
8490
			__skb_queue_tail(&newsk->sk_receive_queue, skb);
8491
			sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8492 8493 8494 8495 8496 8497 8498 8499 8500 8501
		}
	}

	/* Clean up any messages pending delivery due to partial
	 * delivery.   Three cases:
	 * 1) No partial deliver;  no work.
	 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
	 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
	 */
	skb_queue_head_init(&newsp->pd_lobby);
8502
	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
L
Linus Torvalds 已提交
8503

8504
	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
L
Linus Torvalds 已提交
8505 8506 8507 8508 8509 8510 8511 8512 8513 8514 8515 8516 8517 8518
		struct sk_buff_head *queue;

		/* Decide which queue to move pd_lobby skbs to. */
		if (assoc->ulpq.pd_mode) {
			queue = &newsp->pd_lobby;
		} else
			queue = &newsk->sk_receive_queue;

		/* Walk through the pd_lobby, looking for skbs that
		 * need moved to the new socket.
		 */
		sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
			event = sctp_skb2event(skb);
			if (event->asoc == assoc) {
D
David S. Miller 已提交
8519
				__skb_unlink(skb, &oldsp->pd_lobby);
L
Linus Torvalds 已提交
8520
				__skb_queue_tail(queue, skb);
8521
				sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8522 8523 8524 8525 8526 8527 8528
			}
		}

		/* Clear up any skbs waiting for the partial
		 * delivery to finish.
		 */
		if (assoc->ulpq.pd_mode)
8529
			sctp_clear_pd(oldsk, NULL);
L
Linus Torvalds 已提交
8530 8531 8532

	}

8533
	sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8534

L
Linus Torvalds 已提交
8535 8536 8537 8538 8539 8540
	/* Set the type of socket to indicate that it is peeled off from the
	 * original UDP-style socket or created with the accept() call on a
	 * TCP-style socket..
	 */
	newsp->type = type;

8541 8542 8543 8544 8545
	/* Mark the new socket "in-use" by the user so that any packets
	 * that may arrive on the association after we've moved it are
	 * queued to the backlog.  This prevents a potential race between
	 * backlog processing on the old socket and new-packet processing
	 * on the new socket.
8546 8547 8548
	 *
	 * The caller has just allocated newsk so we can guarantee that other
	 * paths won't try to lock it and then oldsk.
8549
	 */
8550
	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8551
	sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
L
Linus Torvalds 已提交
8552
	sctp_assoc_migrate(assoc, newsk);
8553
	sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
L
Linus Torvalds 已提交
8554 8555 8556 8557

	/* If the association on the newsk is already closed before accept()
	 * is called, set RCV_SHUTDOWN flag.
	 */
8558
	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8559
		inet_sk_set_state(newsk, SCTP_SS_CLOSED);
L
Linus Torvalds 已提交
8560
		newsk->sk_shutdown |= RCV_SHUTDOWN;
8561
	} else {
8562
		inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8563
	}
L
Linus Torvalds 已提交
8564

8565
	release_sock(newsk);
L
Linus Torvalds 已提交
8566 8567
}

8568

L
Linus Torvalds 已提交
8569 8570 8571 8572 8573 8574 8575 8576 8577 8578 8579 8580 8581 8582 8583 8584 8585 8586 8587 8588 8589 8590
/* This proto struct describes the ULP interface for SCTP.  */
struct proto sctp_prot = {
	.name        =	"SCTP",
	.owner       =	THIS_MODULE,
	.close       =	sctp_close,
	.connect     =	sctp_connect,
	.disconnect  =	sctp_disconnect,
	.accept      =	sctp_accept,
	.ioctl       =	sctp_ioctl,
	.init        =	sctp_init_sock,
	.destroy     =	sctp_destroy_sock,
	.shutdown    =	sctp_shutdown,
	.setsockopt  =	sctp_setsockopt,
	.getsockopt  =	sctp_getsockopt,
	.sendmsg     =	sctp_sendmsg,
	.recvmsg     =	sctp_recvmsg,
	.bind        =	sctp_bind,
	.backlog_rcv =	sctp_backlog_rcv,
	.hash        =	sctp_hash,
	.unhash      =	sctp_unhash,
	.get_port    =	sctp_get_port,
	.obj_size    =  sizeof(struct sctp_sock),
8591 8592 8593 8594 8595 8596
	.sysctl_mem  =  sysctl_sctp_mem,
	.sysctl_rmem =  sysctl_sctp_rmem,
	.sysctl_wmem =  sysctl_sctp_wmem,
	.memory_pressure = &sctp_memory_pressure,
	.enter_memory_pressure = sctp_enter_memory_pressure,
	.memory_allocated = &sctp_memory_allocated,
8597
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8598 8599
};

E
Eric Dumazet 已提交
8600
#if IS_ENABLED(CONFIG_IPV6)
8601

8602 8603 8604 8605 8606 8607 8608
#include <net/transp_v6.h>
static void sctp_v6_destroy_sock(struct sock *sk)
{
	sctp_destroy_sock(sk);
	inet6_destroy_sock(sk);
}

L
Linus Torvalds 已提交
8609 8610 8611 8612 8613 8614 8615 8616 8617
struct proto sctpv6_prot = {
	.name		= "SCTPv6",
	.owner		= THIS_MODULE,
	.close		= sctp_close,
	.connect	= sctp_connect,
	.disconnect	= sctp_disconnect,
	.accept		= sctp_accept,
	.ioctl		= sctp_ioctl,
	.init		= sctp_init_sock,
8618
	.destroy	= sctp_v6_destroy_sock,
L
Linus Torvalds 已提交
8619 8620 8621 8622 8623 8624 8625 8626 8627 8628 8629
	.shutdown	= sctp_shutdown,
	.setsockopt	= sctp_setsockopt,
	.getsockopt	= sctp_getsockopt,
	.sendmsg	= sctp_sendmsg,
	.recvmsg	= sctp_recvmsg,
	.bind		= sctp_bind,
	.backlog_rcv	= sctp_backlog_rcv,
	.hash		= sctp_hash,
	.unhash		= sctp_unhash,
	.get_port	= sctp_get_port,
	.obj_size	= sizeof(struct sctp6_sock),
8630 8631 8632 8633 8634 8635
	.sysctl_mem	= sysctl_sctp_mem,
	.sysctl_rmem	= sysctl_sctp_rmem,
	.sysctl_wmem	= sysctl_sctp_wmem,
	.memory_pressure = &sctp_memory_pressure,
	.enter_memory_pressure = sctp_enter_memory_pressure,
	.memory_allocated = &sctp_memory_allocated,
8636
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8637
};
E
Eric Dumazet 已提交
8638
#endif /* IS_ENABLED(CONFIG_IPV6) */