socket.c 230.8 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
Linus Torvalds 已提交
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
Linus Torvalds 已提交
759 760 761
	struct sctp_sock	*sp;
	struct sctp_endpoint	*ep;
	struct sctp_association	*asoc;
762
	struct sctp_transport	*transport;
L
Linus Torvalds 已提交
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
 *
 * 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.
 */
998
static int sctp_setsockopt_bindx(struct sock *sk,
999 1000
				 struct sockaddr __user *addrs,
				 int addrs_size, int op)
L
Linus Torvalds 已提交
1001 1002 1003 1004 1005 1006 1007 1008 1009
{
	struct sockaddr *kaddrs;
	int err;
	int addrcnt = 0;
	int walk_size = 0;
	struct sockaddr *sa_addr;
	void *addr_buf;
	struct sctp_af *af;

1010 1011
	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
1012 1013 1014 1015

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

1016 1017 1018
	kaddrs = vmemdup_user(addrs, addrs_size);
	if (unlikely(IS_ERR(kaddrs)))
		return PTR_ERR(kaddrs);
L
Linus Torvalds 已提交
1019

1020
	/* Walk through the addrs buffer and count the number of addresses. */
L
Linus Torvalds 已提交
1021 1022
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
1023
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
1024
			kvfree(kaddrs);
1025 1026 1027
			return -EINVAL;
		}

J
Joe Perches 已提交
1028
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
1029 1030 1031 1032
		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.
1033
		 */
L
Linus Torvalds 已提交
1034
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1035
			kvfree(kaddrs);
L
Linus Torvalds 已提交
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
			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;
1062
	}
L
Linus Torvalds 已提交
1063 1064

out:
1065
	kvfree(kaddrs);
L
Linus Torvalds 已提交
1066 1067 1068 1069

	return err;
}

F
Frank Filz 已提交
1070 1071 1072 1073 1074
/* __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.
 */
1075
static int __sctp_connect(struct sock *sk,
F
Frank Filz 已提交
1076
			  struct sockaddr *kaddrs,
1077 1078
			  int addrs_size,
			  sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1079
{
1080
	struct net *net = sock_net(sk);
F
Frank Filz 已提交
1081 1082 1083 1084 1085 1086
	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
1087
	enum sctp_scope scope;
F
Frank Filz 已提交
1088 1089 1090 1091
	long timeo;
	int err = 0;
	int addrcnt = 0;
	int walk_size = 0;
1092
	union sctp_addr *sa_addr = NULL;
F
Frank Filz 已提交
1093
	void *addr_buf;
1094
	unsigned short port;
1095
	unsigned int f_flags = 0;
F
Frank Filz 已提交
1096 1097 1098 1099 1100 1101 1102 1103 1104

	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.
	 */
1105
	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
F
Frank Filz 已提交
1106 1107 1108 1109 1110 1111 1112 1113
	    (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) {
1114 1115
		struct sctp_af *af;

1116 1117 1118 1119 1120
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

J
Joe Perches 已提交
1121
		sa_addr = addr_buf;
1122
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
F
Frank Filz 已提交
1123 1124 1125 1126 1127 1128 1129 1130 1131

		/* 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;
		}

1132 1133
		port = ntohs(sa_addr->v4.sin_port);

1134 1135 1136 1137
		/* 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
1138 1139 1140
		if (err)
			goto out_free;

1141 1142 1143
		/* Make sure the destination port is correctly set
		 * in all addresses.
		 */
1144 1145
		if (asoc && asoc->peer.port && asoc->peer.port != port) {
			err = -EINVAL;
1146
			goto out_free;
1147
		}
F
Frank Filz 已提交
1148 1149 1150 1151

		/* Check if there already is a matching association on the
		 * endpoint (other than the one created here).
		 */
1152
		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
F
Frank Filz 已提交
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
		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.
		 */
1165
		if (sctp_endpoint_is_peeled_off(ep, &to)) {
F
Frank Filz 已提交
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
			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;
				}
1181 1182
			} else {
				/*
1183 1184 1185 1186
				 * 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
1187 1188
				 * be permitted to open new associations.
				 */
1189 1190 1191 1192
				if (ep->base.bind_addr.port <
				    inet_prot_sock(net) &&
				    !ns_capable(net->user_ns,
				    CAP_NET_BIND_SERVICE)) {
1193 1194 1195
					err = -EACCES;
					goto out_free;
				}
F
Frank Filz 已提交
1196 1197
			}

1198
			scope = sctp_scope(&to);
F
Frank Filz 已提交
1199 1200 1201 1202 1203
			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
			if (!asoc) {
				err = -ENOMEM;
				goto out_free;
			}
1204 1205 1206 1207 1208 1209 1210

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

F
Frank Filz 已提交
1211 1212 1213
		}

		/* Prime the peer's transport structures.  */
1214
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
F
Frank Filz 已提交
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}

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

1226 1227 1228 1229 1230 1231 1232 1233 1234
	/* 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;
	}

1235
	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
F
Frank Filz 已提交
1236 1237 1238 1239 1240
	if (err < 0) {
		goto out_free;
	}

	/* Initialize sk's dport and daddr for getpeername() */
E
Eric Dumazet 已提交
1241
	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1242
	sp->pf->to_sk_daddr(sa_addr, sk);
1243
	sk->sk_err = 0;
F
Frank Filz 已提交
1244

1245 1246 1247 1248 1249 1250 1251 1252
	/* 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);

1253
	if (assoc_id)
1254
		*assoc_id = asoc->assoc_id;
1255 1256 1257 1258
	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
1259 1260 1261 1262 1263

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

out_free:
1264 1265
	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
1266

1267 1268 1269 1270 1271
	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
1272
		sctp_association_free(asoc);
1273
	}
F
Frank Filz 已提交
1274 1275 1276 1277 1278 1279
	return err;
}

/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
 *
 * API 8.9
1280 1281
 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
 * 			sctp_assoc_t *asoc);
F
Frank Filz 已提交
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
 *
 * 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.
 *
1297 1298 1299 1300
 * 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
1301 1302 1303 1304 1305 1306 1307 1308
 *
 * 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
1309
 * the association is implementation dependent.  This function only
F
Frank Filz 已提交
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
 * 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.
 *
 * 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
 *
1330
 * Returns >=0 if ok, <0 errno code on error.
F
Frank Filz 已提交
1331
 */
1332
static int __sctp_setsockopt_connectx(struct sock *sk,
F
Frank Filz 已提交
1333
				      struct sockaddr __user *addrs,
1334 1335
				      int addrs_size,
				      sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1336 1337
{
	struct sockaddr *kaddrs;
1338
	int err = 0;
F
Frank Filz 已提交
1339

1340 1341
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
		 __func__, sk, addrs, addrs_size);
F
Frank Filz 已提交
1342 1343 1344 1345

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

1346 1347 1348
	kaddrs = vmemdup_user(addrs, addrs_size);
	if (unlikely(IS_ERR(kaddrs)))
		return PTR_ERR(kaddrs);
F
Frank Filz 已提交
1349

1350 1351
	err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
	kvfree(kaddrs);
1352

F
Frank Filz 已提交
1353 1354 1355
	return err;
}

1356 1357 1358 1359
/*
 * This is an older interface.  It's kept for backward compatibility
 * to the option that doesn't provide association id.
 */
1360
static int sctp_setsockopt_connectx_old(struct sock *sk,
1361 1362
					struct sockaddr __user *addrs,
					int addrs_size)
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372
{
	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.
 */
1373
static int sctp_setsockopt_connectx(struct sock *sk,
1374 1375
				    struct sockaddr __user *addrs,
				    int addrs_size)
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
{
	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;
}

1388
/*
1389 1390
 * New (hopefully final) interface for the API.
 * We use the sctp_getaddrs_old structure so that use-space library
1391
 * can avoid any unnecessary allocations. The only different part
1392
 * is that we store the actual length of the address buffer into the
1393
 * addrs_num structure member. That way we can re-use the existing
1394
 * code.
1395
 */
1396 1397 1398 1399 1400 1401 1402 1403
#ifdef CONFIG_COMPAT
struct compat_sctp_getaddrs_old {
	sctp_assoc_t	assoc_id;
	s32		addr_num;
	compat_uptr_t	addrs;		/* struct sockaddr * */
};
#endif

1404
static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1405 1406
				     char __user *optval,
				     int __user *optlen)
1407
{
1408
	struct sctp_getaddrs_old param;
1409 1410 1411
	sctp_assoc_t assoc_id = 0;
	int err = 0;

1412
#ifdef CONFIG_COMPAT
1413
	if (in_compat_syscall()) {
1414
		struct compat_sctp_getaddrs_old param32;
1415

1416 1417 1418 1419
		if (len < sizeof(param32))
			return -EINVAL;
		if (copy_from_user(&param32, optval, sizeof(param32)))
			return -EFAULT;
1420

1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
		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;
	}
1432

1433 1434 1435
	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
					 param.addrs, param.addr_num,
					 &assoc_id);
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
	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
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
/* 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.
 */
1496
static void sctp_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
1497
{
1498
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1499 1500 1501
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;
	struct list_head *pos, *temp;
1502
	unsigned int data_was_unread;
L
Linus Torvalds 已提交
1503

1504
	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
L
Linus Torvalds 已提交
1505

1506
	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
1507
	sk->sk_shutdown = SHUTDOWN_MASK;
1508
	inet_sk_set_state(sk, SCTP_SS_CLOSING);
L
Linus Torvalds 已提交
1509 1510 1511

	ep = sctp_sk(sk)->ep;

1512 1513 1514 1515
	/* 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);

1516
	/* Walk all associations on an endpoint.  */
L
Linus Torvalds 已提交
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
	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);
1528 1529 1530
				continue;
			}
		}
L
Linus Torvalds 已提交
1531

1532 1533
		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
		    !skb_queue_empty(&asoc->ulpq.reasm) ||
1534
		    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1535
		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1536 1537 1538
			struct sctp_chunk *chunk;

			chunk = sctp_make_abort_user(asoc, NULL, 0);
1539
			sctp_primitive_ABORT(net, asoc, chunk);
1540
		} else
1541
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1542 1543 1544 1545 1546 1547 1548
	}

	/* 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.  */
1549
	release_sock(sk);
L
Linus Torvalds 已提交
1550 1551 1552

	/* Supposedly, no process has access to the socket, but
	 * the net layers still may.
1553 1554
	 * 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
1555
	 */
1556
	spin_lock_bh(&net->sctp.addr_wq_lock);
1557
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1558 1559 1560 1561 1562 1563 1564

	/* 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);

1565
	bh_unlock_sock(sk);
1566
	spin_unlock_bh(&net->sctp.addr_wq_lock);
L
Linus Torvalds 已提交
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605

	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
1606 1607
static int sctp_msghdr_parse(const struct msghdr *msg,
			     struct sctp_cmsgs *cmsgs);
L
Linus Torvalds 已提交
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 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
			      struct sctp_sndrcvinfo *srinfo,
			      const struct msghdr *msg, size_t msg_len)
{
	__u16 sflags;
	int err;

	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
		return -EPIPE;

	if (msg_len > sk->sk_sndbuf)
		return -EMSGSIZE;

	memset(cmsgs, 0, sizeof(*cmsgs));
	err = sctp_msghdr_parse(msg, cmsgs);
	if (err) {
		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
		return err;
	}

	memset(srinfo, 0, sizeof(*srinfo));
	if (cmsgs->srinfo) {
		srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
		srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
		srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
		srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
		srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
		srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
	}

	if (cmsgs->sinfo) {
		srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
		srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
		srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
		srinfo->sinfo_context = cmsgs->sinfo->snd_context;
		srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
	}

	sflags = srinfo->sinfo_flags;
	if (!sflags && msg_len)
		return 0;

	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
		return -EINVAL;

	if (((sflags & SCTP_EOF) && msg_len > 0) ||
	    (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
		return -EINVAL;

	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
		return -EINVAL;

	return 0;
}

1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
				 struct sctp_cmsgs *cmsgs,
				 union sctp_addr *daddr,
				 struct sctp_transport **tp)
{
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	struct net *net = sock_net(sk);
	struct sctp_association *asoc;
	enum sctp_scope scope;
	int err = -EINVAL;

	*tp = NULL;

	if (sflags & (SCTP_EOF | SCTP_ABORT))
		return -EINVAL;

	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
				    sctp_sstate(sk, CLOSING)))
		return -EADDRNOTAVAIL;

	if (sctp_endpoint_is_peeled_off(ep, daddr))
		return -EADDRNOTAVAIL;

	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
	} else {
		if (ep->base.bind_addr.port < inet_prot_sock(net) &&
		    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
			return -EACCES;
	}

	scope = sctp_scope(daddr);

	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
	if (!asoc)
		return -ENOMEM;

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

	if (cmsgs->init) {
		struct sctp_initmsg *init = cmsgs->init;

		if (init->sinit_num_ostreams) {
			__u16 outcnt = init->sinit_num_ostreams;

			asoc->c.sinit_num_ostreams = outcnt;
			/* outcnt has been changed, need to re-init stream */
			err = sctp_stream_init(&asoc->stream, outcnt, 0,
					       GFP_KERNEL);
			if (err)
				goto free;
		}

		if (init->sinit_max_instreams)
			asoc->c.sinit_max_instreams = init->sinit_max_instreams;

		if (init->sinit_max_attempts)
			asoc->max_init_attempts = init->sinit_max_attempts;

		if (init->sinit_max_init_timeo)
			asoc->max_init_timeo =
				msecs_to_jiffies(init->sinit_max_init_timeo);
	}

	*tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
	if (!*tp) {
		err = -ENOMEM;
		goto free;
	}

	return 0;

free:
	sctp_association_free(asoc);
	return err;
}

1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
				     __u16 sflags, struct msghdr *msg,
				     size_t msg_len)
{
	struct sock *sk = asoc->base.sk;
	struct net *net = sock_net(sk);

	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
		return -EPIPE;

	if (sflags & SCTP_EOF) {
		pr_debug("%s: shutting down association:%p\n", __func__, asoc);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);

		return 0;
	}

	if (sflags & SCTP_ABORT) {
		struct sctp_chunk *chunk;

		chunk = sctp_make_abort_user(asoc, msg, msg_len);
		if (!chunk)
			return -ENOMEM;

		pr_debug("%s: aborting association:%p\n", __func__, asoc);
		sctp_primitive_ABORT(net, asoc, chunk);

		return 0;
	}

	return 1;
}

1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 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 1868 1869 1870 1871
static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
				struct msghdr *msg, size_t msg_len,
				struct sctp_transport *transport,
				struct sctp_sndrcvinfo *sinfo)
{
	struct sock *sk = asoc->base.sk;
	struct net *net = sock_net(sk);
	struct sctp_datamsg *datamsg;
	bool wait_connect = false;
	struct sctp_chunk *chunk;
	long timeo;
	int err;

	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
		err = -EINVAL;
		goto err;
	}

	if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
		err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
		if (err)
			goto err;
	}

	if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
		err = -EMSGSIZE;
		goto err;
	}

	if (sctp_state(asoc, CLOSED)) {
		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
		if (err)
			goto err;

		if (sctp_sk(sk)->strm_interleave) {
			timeo = sock_sndtimeo(sk, 0);
			err = sctp_wait_for_connect(asoc, &timeo);
			if (err)
				goto err;
		} else {
			wait_connect = true;
		}

		pr_debug("%s: we associated primitively\n", __func__);
	}

	if (asoc->pmtu_pending)
		sctp_assoc_pending_pmtu(asoc);

	if (sctp_wspace(asoc) < msg_len)
		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));

	if (!sctp_wspace(asoc)) {
		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
		if (err)
			goto err;
	}

	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
	if (IS_ERR(datamsg)) {
		err = PTR_ERR(datamsg);
		goto err;
	}

	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);

	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
		sctp_chunk_hold(chunk);
		sctp_set_owner_w(chunk);
		chunk->transport = transport;
	}

	err = sctp_primitive_SEND(net, asoc, datamsg);
	if (err) {
		sctp_datamsg_free(datamsg);
		goto err;
	}

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

	sctp_datamsg_put(datamsg);

	if (unlikely(wait_connect)) {
		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
		sctp_wait_for_connect(asoc, &timeo);
	}

	err = msg_len;

err:
	return err;
}

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static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
					       const struct msghdr *msg,
					       struct sctp_cmsgs *cmsgs)
{
	union sctp_addr *daddr = NULL;
	int err;

	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
		int len = msg->msg_namelen;

		if (len > sizeof(*daddr))
			len = sizeof(*daddr);

		daddr = (union sctp_addr *)msg->msg_name;

		err = sctp_verify_addr(sk, daddr, len);
		if (err)
			return ERR_PTR(err);
	}

	return daddr;
}

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static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
				      struct sctp_sndrcvinfo *sinfo,
				      struct sctp_cmsgs *cmsgs)
{
	if (!cmsgs->srinfo && !cmsgs->sinfo) {
		sinfo->sinfo_stream = asoc->default_stream;
		sinfo->sinfo_ppid = asoc->default_ppid;
		sinfo->sinfo_context = asoc->default_context;
		sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
	}

	if (!cmsgs->srinfo)
		sinfo->sinfo_timetolive = asoc->default_timetolive;
}

1910
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
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{
1912
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1913
	struct sctp_association *new_asoc = NULL, *asoc = NULL;
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	struct sctp_transport *transport, *chunk_tp;
1915
	struct sctp_sndrcvinfo _sinfo, *sinfo;
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	sctp_assoc_t associd = 0;
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	struct sctp_cmsgs cmsgs = { NULL };
1918
	__u16 sinfo_flags = 0;
1919
	union sctp_addr *daddr;
1920
	int err;
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1922 1923 1924
	/* Parse and get snd_info */
	err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
	if (err)
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		goto out_nounlock;

1927 1928
	sinfo  = &_sinfo;
	sinfo_flags = sinfo->sinfo_flags;
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1930 1931 1932 1933 1934
	/* Get daddr from msg */
	daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
	if (IS_ERR(daddr)) {
		err = PTR_ERR(daddr);
		goto out_nounlock;
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	}

1937
	lock_sock(sk);
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1938 1939

	/* If a msg_name has been specified, assume this is to be used.  */
1940
	if (daddr) {
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		/* Look for a matching association on the endpoint. */
1942
		asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
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	} else {
		asoc = sctp_id2assoc(sk, associd);
		if (!asoc) {
			err = -EPIPE;
			goto out_unlock;
		}
	}

	if (asoc) {
1952 1953 1954
		err = sctp_sendmsg_check_sflags(asoc, sinfo_flags, msg,
						msg_len);
		if (err <= 0)
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			goto out_unlock;
	}

	/* Do we need to create the association?  */
	if (!asoc) {
1960
		err = sctp_sendmsg_new_asoc(sk, sinfo_flags, &cmsgs, daddr,
1961 1962
					    &transport);
		if (err)
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			goto out_unlock;

1965 1966
		asoc = transport->asoc;
		new_asoc = asoc;
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	}

1969 1970
	/* Update snd_info with the asoc */
	sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
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	/* If an address is passed with the sendto/sendmsg call, it is used
	 * to override the primary destination address in the TCP model, or
1974
	 * when SCTP_ADDR_OVER flag is set in the UDP model.
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	 */
1976
	if ((sctp_style(sk, TCP) && daddr) ||
1977
	    (sinfo_flags & SCTP_ADDR_OVER)) {
1978
		chunk_tp = sctp_assoc_lookup_paddr(asoc, daddr);
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		if (!chunk_tp) {
			err = -EINVAL;
			goto out_free;
		}
	} else
		chunk_tp = NULL;

1986 1987
	/* Send msg to the asoc */
	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, chunk_tp, sinfo);
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out_free:
1990
	if (err < 0 && err != -ESRCH && new_asoc)
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		sctp_association_free(asoc);
out_unlock:
1993
	release_sock(sk);
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out_nounlock:
1995
	return sctp_error(sk, msg->msg_flags, err);
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}

/* 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);

2018
	skb_walk_frags(skb, list) {
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		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.
 */
2047 2048
static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
			int noblock, int flags, int *addr_len)
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{
	struct sctp_ulpevent *event = NULL;
	struct sctp_sock *sp = sctp_sk(sk);
2052
	struct sk_buff *skb, *head_skb;
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	int copied;
	int err = 0;
	int skb_len;

2057 2058 2059
	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);
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2061
	lock_sock(sk);
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2063
	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2064
	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
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		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;

2082
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
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	event = sctp_skb2event(skb);

	if (err)
		goto out_free;

2089 2090 2091 2092 2093
	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);
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	if (sctp_ulpevent_is_notification(event)) {
		msg->msg_flags |= MSG_NOTIFICATION;
		sp->pf->event_msgname(event, msg->msg_name, addr_len);
	} else {
2098
		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
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	}

2101 2102 2103
	/* Check if we allow SCTP_NXTINFO. */
	if (sp->recvnxtinfo)
		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2104 2105 2106
	/* Check if we allow SCTP_RCVINFO. */
	if (sp->recvrcvinfo)
		sctp_ulpevent_read_rcvinfo(event, msg);
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2107 2108 2109
	/* Check if we allow SCTP_SNDRCVINFO. */
	if (sp->subscribe.sctp_data_io_event)
		sctp_ulpevent_read_sndrcvinfo(event, msg);
2110

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	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);

2124 2125 2126 2127 2128 2129
		/* 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);
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		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:
2151
	release_sock(sk);
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	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,
2163 2164
					     char __user *optval,
					     unsigned int optlen)
L
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2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
{
	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,
2180
				  unsigned int optlen)
L
Linus Torvalds 已提交
2181
{
2182 2183 2184
	struct sctp_association *asoc;
	struct sctp_ulpevent *event;

2185
	if (optlen > sizeof(struct sctp_event_subscribe))
L
Linus Torvalds 已提交
2186 2187 2188
		return -EINVAL;
	if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
		return -EFAULT;
2189

2190
	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2191 2192 2193 2194 2195 2196 2197 2198 2199
	 * 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,
2200
					GFP_USER | __GFP_NOWARN);
2201 2202 2203
			if (!event)
				return -ENOMEM;

2204
			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2205 2206 2207
		}
	}

L
Linus Torvalds 已提交
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222
	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,
2223
				     unsigned int optlen)
L
Linus Torvalds 已提交
2224 2225
{
	struct sctp_sock *sp = sctp_sk(sk);
2226
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235

	/* 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;

2236 2237 2238
	if (sp->autoclose > net->sctp.max_autoclose)
		sp->autoclose = net->sctp.max_autoclose;

L
Linus Torvalds 已提交
2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251
	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 {
2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263
 *     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
2264 2265
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2266 2267 2268
 *                     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
2269 2270
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
 *                     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.
 *
2309 2310 2311 2312
 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
 *                     heartbeat delayis to be set to the value of 0
 *                     milliseconds.
 *
2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337
 *                     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
2338
 */
A
Adrian Bunk 已提交
2339 2340 2341 2342 2343 2344 2345
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)
2346 2347 2348 2349
{
	int error;

	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2350 2351 2352
		struct net *net = sock_net(trans->asoc->base.sk);

		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2353 2354 2355 2356
		if (error)
			return error;
	}

2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380
	/* 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;
			}
2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
		}
	}

	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;
		}
	}

2397 2398 2399 2400 2401 2402
	/* 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) {
2403 2404
		if (trans) {
			trans->pathmtu = params->spp_pathmtu;
2405
			sctp_assoc_sync_pmtu(asoc);
2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419
		} 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) {
2420
				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2421
				sctp_assoc_sync_pmtu(asoc);
2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
			}
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
		}
	}

2432 2433 2434 2435 2436
	/* 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) {
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463
		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;
		}
	}

2464 2465
	/* Note that a value of zero indicates the current setting should be
	   left unchanged.
2466
	 */
2467
	if (params->spp_pathmaxrxt) {
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
		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
2480
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2481 2482
					    char __user *optval,
					    unsigned int optlen)
L
Linus Torvalds 已提交
2483
{
2484 2485 2486 2487
	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
2488
	int error;
2489
	int hb_change, pmtud_change, sackdelay_change;
L
Linus Torvalds 已提交
2490 2491

	if (optlen != sizeof(struct sctp_paddrparams))
2492
		return -EINVAL;
2493

L
Linus Torvalds 已提交
2494 2495 2496
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

2497 2498 2499 2500 2501 2502 2503 2504 2505
	/* 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 ||
2506 2507
	    (params.spp_pathmtu &&
	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2508
		return -EINVAL;
L
Linus Torvalds 已提交
2509

2510 2511 2512
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
	 */
2513
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2514 2515 2516
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans)
L
Linus Torvalds 已提交
2517 2518 2519
			return -EINVAL;
	}

2520 2521 2522 2523 2524 2525
	/* 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
2526 2527
		return -EINVAL;

2528 2529
	/* Heartbeat demand can only be sent on a transport or
	 * association, but not a socket.
L
Linus Torvalds 已提交
2530
	 */
2531 2532 2533 2534 2535 2536 2537
	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
2538

2539 2540 2541 2542 2543
	if (error)
		return error;

	/* If changes are for association, also apply parameters to each
	 * transport.
L
Linus Torvalds 已提交
2544
	 */
2545
	if (!trans && asoc) {
2546 2547
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2548 2549 2550 2551 2552
			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
						    hb_change, pmtud_change,
						    sackdelay_change);
		}
	}
L
Linus Torvalds 已提交
2553 2554 2555 2556

	return 0;
}

2557 2558 2559 2560 2561 2562 2563 2564 2565 2566
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;
}

2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
/*
 * 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.
2601 2602
 */

2603
static int sctp_setsockopt_delayed_ack(struct sock *sk,
2604
				       char __user *optval, unsigned int optlen)
2605
{
2606
	struct sctp_sack_info    params;
2607 2608 2609 2610
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

2611 2612 2613
	if (optlen == sizeof(struct sctp_sack_info)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
2614

2615 2616 2617
		if (params.sack_delay == 0 && params.sack_freq == 0)
			return 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2618
		pr_warn_ratelimited(DEPRECATED
2619
				    "%s (pid %d) "
2620
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2621 2622
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
2623 2624 2625 2626 2627 2628 2629 2630
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;

		if (params.sack_delay == 0)
			params.sack_freq = 1;
		else
			params.sack_freq = 0;
	} else
2631
		return -EINVAL;
2632 2633

	/* Validate value parameter. */
2634
	if (params.sack_delay > 500)
2635 2636
		return -EINVAL;

2637
	/* Get association, if sack_assoc_id != 0 and the socket is a one
2638 2639
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
2640
	 */
2641 2642
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2643 2644
		return -EINVAL;

2645
	if (params.sack_delay) {
2646 2647
		if (asoc) {
			asoc->sackdelay =
2648
				msecs_to_jiffies(params.sack_delay);
2649
			asoc->param_flags =
2650
				sctp_spp_sackdelay_enable(asoc->param_flags);
2651
		} else {
2652
			sp->sackdelay = params.sack_delay;
2653
			sp->param_flags =
2654
				sctp_spp_sackdelay_enable(sp->param_flags);
2655
		}
2656 2657 2658
	}

	if (params.sack_freq == 1) {
2659
		if (asoc) {
2660
			asoc->param_flags =
2661
				sctp_spp_sackdelay_disable(asoc->param_flags);
2662
		} else {
2663
			sp->param_flags =
2664
				sctp_spp_sackdelay_disable(sp->param_flags);
2665
		}
2666 2667 2668 2669
	} else if (params.sack_freq > 1) {
		if (asoc) {
			asoc->sackfreq = params.sack_freq;
			asoc->param_flags =
2670
				sctp_spp_sackdelay_enable(asoc->param_flags);
2671 2672 2673
		} else {
			sp->sackfreq = params.sack_freq;
			sp->param_flags =
2674
				sctp_spp_sackdelay_enable(sp->param_flags);
2675
		}
2676 2677 2678 2679
	}

	/* If change is for association, also apply to each transport. */
	if (asoc) {
2680 2681
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2682
			if (params.sack_delay) {
2683
				trans->sackdelay =
2684
					msecs_to_jiffies(params.sack_delay);
2685
				trans->param_flags =
2686
					sctp_spp_sackdelay_enable(trans->param_flags);
2687
			}
2688
			if (params.sack_freq == 1) {
2689
				trans->param_flags =
2690
					sctp_spp_sackdelay_disable(trans->param_flags);
2691 2692 2693
			} else if (params.sack_freq > 1) {
				trans->sackfreq = params.sack_freq;
				trans->param_flags =
2694
					sctp_spp_sackdelay_enable(trans->param_flags);
2695 2696 2697
			}
		}
	}
2698

2699 2700 2701
	return 0;
}

L
Linus Torvalds 已提交
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712
/* 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.
 */
2713
static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
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{
	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)
2724
		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
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	if (sinit.sinit_max_instreams)
2726
		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
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	if (sinit.sinit_max_attempts)
2728
		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
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	if (sinit.sinit_max_init_timeo)
2730
		sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
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	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,
2750 2751
					      char __user *optval,
					      unsigned int optlen)
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{
	struct sctp_sock *sp = sctp_sk(sk);
2754 2755
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
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2756

2757
	if (optlen != sizeof(info))
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		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
2761 2762 2763 2764
	if (info.sinfo_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;
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	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;
}

2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823
/* 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;
}

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/* 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,
2831
					unsigned int optlen)
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{
	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,
2860
				   unsigned int optlen)
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{
	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.
 *
 */
2885 2886
static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
{
L
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	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;
2889 2890
	unsigned long rto_min, rto_max;
	struct sctp_sock *sp = sctp_sk(sk);
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2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903

	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;

2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919
	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;

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	if (asoc) {
		if (rtoinfo.srto_initial != 0)
2922
			asoc->rto_initial =
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2923
				msecs_to_jiffies(rtoinfo.srto_initial);
2924 2925
		asoc->rto_max = rto_max;
		asoc->rto_min = rto_min;
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2926 2927 2928 2929 2930 2931
	} 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;
2932 2933
		sp->rtoinfo.srto_max = rto_max;
		sp->rtoinfo.srto_min = rto_min;
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2934 2935 2936 2937 2938 2939 2940 2941 2942
	}

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
2943
 * This option is used to tune the maximum retransmission attempts
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2944 2945 2946 2947 2948 2949
 * 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.
 *
 */
2950
static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
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2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967
{

	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) {
2968 2969 2970 2971 2972
		if (assocparams.sasoc_asocmaxrxt != 0) {
			__u32 path_sum = 0;
			int   paths = 0;
			struct sctp_transport *peer_addr;

2973 2974
			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
					transports) {
2975 2976 2977 2978
				path_sum += peer_addr->pathmaxrxt;
				paths++;
			}

2979
			/* Only validate asocmaxrxt if we have more than
2980 2981 2982 2983 2984 2985 2986 2987
			 * 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;

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			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2989 2990
		}

2991 2992
		if (assocparams.sasoc_cookie_life != 0)
			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
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	} 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.
 */
3017
static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
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3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034
{
	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;
}

/*
3035 3036 3037
 * 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
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3038 3039 3040
 * 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
3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
 * 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.
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3060
 */
3061
static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
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3062
{
3063
	struct sctp_sock *sp = sctp_sk(sk);
3064
	struct sctp_assoc_value params;
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3065 3066 3067
	struct sctp_association *asoc;
	int val;

3068
	if (optlen == sizeof(int)) {
3069
		pr_warn_ratelimited(DEPRECATED
3070
				    "%s (pid %d) "
3071
				    "Use of int in maxseg socket option.\n"
3072 3073
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3074 3075 3076 3077 3078 3079 3080
		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;
3081
	} else {
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3082
		return -EINVAL;
3083
	}
3084

3085 3086
	if (val) {
		int min_len, max_len;
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3087

3088 3089 3090 3091 3092
		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);
3093

3094 3095 3096 3097 3098
		if (val < min_len || val > max_len)
			return -EINVAL;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
3099 3100
	if (asoc) {
		if (val == 0) {
3101
			val = asoc->pathmtu - sp->pf->af->net_header_len;
3102
			val -= sizeof(struct sctphdr) +
3103
			       sctp_datachk_len(&asoc->stream);
3104
		}
3105 3106
		asoc->user_frag = val;
		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3107
	} else {
3108 3109
		if (params.assoc_id && sctp_style(sk, UDP))
			return -EINVAL;
3110
		sp->user_frag = val;
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3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125
	}

	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,
3126
					     unsigned int optlen)
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3127
{
3128
	struct net *net = sock_net(sk);
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3129 3130 3131 3132
	struct sctp_sock	*sp;
	struct sctp_association	*asoc = NULL;
	struct sctp_setpeerprim	prim;
	struct sctp_chunk	*chunk;
3133
	struct sctp_af		*af;
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3134 3135 3136 3137
	int 			err;

	sp = sctp_sk(sk);

3138
	if (!net->sctp.addip_enable)
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		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);
3148
	if (!asoc)
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3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159
		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;

3160 3161 3162 3163 3164 3165 3166
	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;

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	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);

3178
	pr_debug("%s: we set peer primary addr primitively\n", __func__);
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3179 3180 3181 3182

	return err;
}

3183
static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3184
					    unsigned int optlen)
L
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3185
{
3186
	struct sctp_setadaptation adaptation;
L
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3187

3188
	if (optlen != sizeof(struct sctp_setadaptation))
L
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3189
		return -EINVAL;
3190
	if (copy_from_user(&adaptation, optval, optlen))
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3191 3192
		return -EFAULT;

3193
	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
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3194 3195 3196 3197

	return 0;
}

3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
/*
 * 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,
3213
				   unsigned int optlen)
3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237
{
	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;
}

3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263
/*
 * 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,
3264
					       unsigned int optlen)
3265 3266 3267 3268 3269 3270 3271 3272
{
	int val;

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

3273 3274 3275 3276
	sctp_sk(sk)->frag_interleave = !!val;

	if (!sctp_sk(sk)->frag_interleave)
		sctp_sk(sk)->strm_interleave = 0;
3277 3278 3279 3280

	return 0;
}

3281
/*
3282
 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3283
 *       (SCTP_PARTIAL_DELIVERY_POINT)
3284
 *
3285 3286 3287
 * 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
3288
 * lower value will cause partial deliveries to happen more often.  The
3289
 * calls argument is an integer that sets or gets the partial delivery
3290 3291 3292 3293 3294 3295 3296
 * 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.
3297 3298 3299
 */
static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
						  char __user *optval,
3300
						  unsigned int optlen)
3301 3302 3303 3304 3305 3306 3307 3308
{
	u32 val;

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

3309 3310 3311 3312 3313 3314
	/* 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;

3315 3316 3317 3318 3319
	sctp_sk(sk)->pd_point = val;

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

3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332
/*
 * 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,
3333
				    unsigned int optlen)
3334
{
3335 3336 3337
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
3338
	int val;
3339
	int assoc_id = 0;
3340

3341
	if (optlen == sizeof(int)) {
3342
		pr_warn_ratelimited(DEPRECATED
3343
				    "%s (pid %d) "
3344
				    "Use of int in max_burst socket option deprecated.\n"
3345 3346
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3347 3348 3349 3350 3351 3352 3353 3354
		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
3355 3356
		return -EINVAL;

3357 3358 3359 3360 3361 3362 3363 3364 3365
	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;
3366 3367 3368 3369

	return 0;
}

3370 3371 3372 3373 3374 3375 3376 3377
/*
 * 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,
3378 3379
				      char __user *optval,
				      unsigned int optlen)
3380
{
3381
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3382 3383
	struct sctp_authchunk val;

3384
	if (!ep->auth_enable)
3385 3386
		return -EACCES;

3387 3388 3389 3390 3391 3392
	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
3393 3394 3395 3396 3397
	case SCTP_CID_INIT:
	case SCTP_CID_INIT_ACK:
	case SCTP_CID_SHUTDOWN_COMPLETE:
	case SCTP_CID_AUTH:
		return -EINVAL;
3398 3399 3400
	}

	/* add this chunk id to the endpoint */
3401
	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3402 3403 3404 3405 3406 3407 3408 3409 3410
}

/*
 * 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,
3411 3412
				      char __user *optval,
				      unsigned int optlen)
3413
{
3414
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3415
	struct sctp_hmacalgo *hmacs;
3416
	u32 idents;
3417 3418
	int err;

3419
	if (!ep->auth_enable)
3420 3421
		return -EACCES;

3422 3423
	if (optlen < sizeof(struct sctp_hmacalgo))
		return -EINVAL;
3424 3425
	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
					     SCTP_AUTH_NUM_HMACS * sizeof(u16));
3426

3427
	hmacs = memdup_user(optval, optlen);
3428 3429
	if (IS_ERR(hmacs))
		return PTR_ERR(hmacs);
3430

3431 3432 3433
	idents = hmacs->shmac_num_idents;
	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3434 3435 3436 3437
		err = -EINVAL;
		goto out;
	}

3438
	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451
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,
3452
				    unsigned int optlen)
3453
{
3454
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3455 3456 3457 3458
	struct sctp_authkey *authkey;
	struct sctp_association *asoc;
	int ret;

3459
	if (!ep->auth_enable)
3460 3461
		return -EACCES;

3462 3463
	if (optlen <= sizeof(struct sctp_authkey))
		return -EINVAL;
3464 3465 3466 3467 3468
	/* 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));
3469

3470
	authkey = memdup_user(optval, optlen);
3471 3472
	if (IS_ERR(authkey))
		return PTR_ERR(authkey);
3473

3474
	if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3475 3476 3477 3478
		ret = -EINVAL;
		goto out;
	}

3479 3480 3481 3482 3483 3484
	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
	if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
		ret = -EINVAL;
		goto out;
	}

3485
	ret = sctp_auth_set_key(ep, asoc, authkey);
3486
out:
3487
	kzfree(authkey);
3488 3489 3490 3491 3492 3493 3494 3495 3496 3497
	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,
3498 3499
				      char __user *optval,
				      unsigned int optlen)
3500
{
3501
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3502 3503 3504
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3505
	if (!ep->auth_enable)
3506 3507
		return -EACCES;

3508 3509 3510 3511 3512 3513 3514 3515 3516
	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;

3517
	return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3518 3519 3520 3521 3522 3523 3524 3525
}

/*
 * 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,
3526 3527
				   char __user *optval,
				   unsigned int optlen)
3528
{
3529
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3530 3531 3532
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

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

3536 3537 3538 3539 3540 3541 3542 3543 3544
	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;

3545
	return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3546 3547 3548

}

3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577
/*
 * 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;

3578
	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3579 3580 3581 3582 3583
	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,
3584
		    &sock_net(sk)->sctp.auto_asconf_splist);
3585 3586
		sp->do_auto_asconf = 1;
	}
3587
	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3588 3589 3590
	return 0;
}

3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640
/*
 * 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;
}

3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656
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;
}

3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672
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;
}

3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
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;
}

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
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;
}

3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779
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;
}

3780 3781 3782 3783 3784 3785 3786 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
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;
}

3816 3817 3818 3819 3820 3821 3822 3823
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;

3824
	if (optlen < sizeof(*params))
3825
		return -EINVAL;
3826 3827 3828
	/* 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));
3829 3830 3831 3832 3833

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

3834 3835 3836 3837
	if (params->srs_number_streams * sizeof(__u16) >
	    optlen - sizeof(*params))
		goto out;

3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848
	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_streams(asoc, params);

out:
	kfree(params);
	return retval;
}

3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874
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;
}

3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900
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;
}

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 3930
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;
}

3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958
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;
}

3959 3960 3961 3962 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 3989 3990 3991 3992
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
3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011
/* 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.
 */
4012 4013
static int sctp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
4014 4015 4016
{
	int retval = 0;

4017
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030

	/* 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;
	}

4031
	lock_sock(sk);
L
Linus Torvalds 已提交
4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045

	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;

4046 4047 4048 4049 4050 4051 4052
	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
4053 4054
	case SCTP_SOCKOPT_CONNECTX:
		/* 'optlen' is the size of the addresses buffer. */
4055 4056 4057
		retval = sctp_setsockopt_connectx(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
F
Frank Filz 已提交
4058 4059
		break;

L
Linus Torvalds 已提交
4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075
	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;

4076
	case SCTP_DELAYED_SACK:
4077
		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4078
		break;
4079 4080 4081
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
		break;
4082

L
Linus Torvalds 已提交
4083 4084 4085 4086 4087 4088 4089
	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;
4090 4091 4092
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113
	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;
4114 4115
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
L
Linus Torvalds 已提交
4116
		break;
4117 4118 4119
	case SCTP_CONTEXT:
		retval = sctp_setsockopt_context(sk, optval, optlen);
		break;
4120 4121 4122
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
		break;
4123 4124 4125
	case SCTP_MAX_BURST:
		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
		break;
4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140
	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;
4141 4142 4143
	case SCTP_AUTO_ASCONF:
		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
		break;
4144 4145 4146
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
		break;
4147 4148 4149
	case SCTP_RECVRCVINFO:
		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
		break;
4150 4151 4152
	case SCTP_RECVNXTINFO:
		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
		break;
4153 4154 4155
	case SCTP_PR_SUPPORTED:
		retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
		break;
4156 4157 4158
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
		break;
4159 4160 4161
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
		break;
4162 4163 4164
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
		break;
4165 4166 4167
	case SCTP_RESET_STREAMS:
		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
		break;
4168 4169 4170
	case SCTP_RESET_ASSOC:
		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
		break;
4171 4172 4173
	case SCTP_ADD_STREAMS:
		retval = sctp_setsockopt_add_streams(sk, optval, optlen);
		break;
4174 4175 4176
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_setsockopt_scheduler(sk, optval, optlen);
		break;
4177 4178 4179
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
		break;
4180 4181 4182 4183
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_setsockopt_interleaving_supported(sk, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
4184 4185 4186
	default:
		retval = -ENOPROTOOPT;
		break;
4187
	}
L
Linus Torvalds 已提交
4188

4189
	release_sock(sk);
L
Linus Torvalds 已提交
4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210

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.
 */
4211 4212
static int sctp_connect(struct sock *sk, struct sockaddr *addr,
			int addr_len)
L
Linus Torvalds 已提交
4213 4214
{
	int err = 0;
F
Frank Filz 已提交
4215
	struct sctp_af *af;
L
Linus Torvalds 已提交
4216

4217
	lock_sock(sk);
L
Linus Torvalds 已提交
4218

4219 4220
	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
4221

F
Frank Filz 已提交
4222 4223 4224 4225 4226 4227 4228 4229
	/* 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.
		 */
4230
		err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
L
Linus Torvalds 已提交
4231 4232
	}

4233
	release_sock(sk);
L
Linus Torvalds 已提交
4234 4235 4236 4237
	return err;
}

/* FIXME: Write comments. */
4238
static int sctp_disconnect(struct sock *sk, int flags)
L
Linus Torvalds 已提交
4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249
{
	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.
 */
4250
static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
L
Linus Torvalds 已提交
4251 4252 4253 4254 4255 4256 4257 4258
{
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sock *newsk = NULL;
	struct sctp_association *asoc;
	long timeo;
	int error = 0;

4259
	lock_sock(sk);
L
Linus Torvalds 已提交
4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273

	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;
	}

4274
	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
L
Linus Torvalds 已提交
4275 4276 4277 4278 4279 4280 4281 4282 4283 4284

	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);

4285
	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
L
Linus Torvalds 已提交
4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296
	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:
4297
	release_sock(sk);
4298
	*err = error;
L
Linus Torvalds 已提交
4299 4300 4301 4302
	return newsk;
}

/* The SCTP ioctl handler. */
4303
static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
L
Linus Torvalds 已提交
4304
{
4305 4306
	int rc = -ENOTCONN;

4307
	lock_sock(sk);
4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330

	/*
	 * 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;
4331
	}
4332 4333 4334 4335 4336
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
4337
	release_sock(sk);
4338
	return rc;
L
Linus Torvalds 已提交
4339 4340 4341 4342 4343 4344
}

/* 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.
 */
4345
static int sctp_init_sock(struct sock *sk)
L
Linus Torvalds 已提交
4346
{
4347
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4348 4349
	struct sctp_sock *sp;

4350
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365

	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
4366 4367
	sk->sk_gso_type = SKB_GSO_SCTP;

L
Linus Torvalds 已提交
4368 4369 4370 4371 4372 4373 4374 4375 4376
	/* 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;

4377
	sp->default_rcv_context = 0;
4378
	sp->max_burst = net->sctp.max_burst;
4379

4380 4381
	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;

L
Linus Torvalds 已提交
4382 4383 4384 4385 4386 4387
	/* 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;
4388 4389
	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
4390 4391 4392 4393

	/* Initialize default RTO related parameters.  These parameters can
	 * be modified for with the SCTP_RTOINFO socket option.
	 */
4394 4395 4396
	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
4397 4398 4399 4400

	/* Initialize default association related parameters. These parameters
	 * can be modified with the SCTP_ASSOCINFO socket option.
	 */
4401
	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
L
Linus Torvalds 已提交
4402 4403 4404
	sp->assocparams.sasoc_number_peer_destinations = 0;
	sp->assocparams.sasoc_peer_rwnd = 0;
	sp->assocparams.sasoc_local_rwnd = 0;
4405
	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
L
Linus Torvalds 已提交
4406 4407

	/* Initialize default event subscriptions. By default, all the
4408
	 * options are off.
L
Linus Torvalds 已提交
4409 4410 4411 4412 4413 4414
	 */
	memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));

	/* Default Peer Address Parameters.  These defaults can
	 * be modified via SCTP_PEER_ADDR_PARAMS
	 */
4415 4416
	sp->hbinterval  = net->sctp.hb_interval;
	sp->pathmaxrxt  = net->sctp.max_retrans_path;
4417
	sp->pathmtu     = 0; /* allow default discovery */
4418
	sp->sackdelay   = net->sctp.sack_timeout;
4419
	sp->sackfreq	= 2;
4420
	sp->param_flags = SPP_HB_ENABLE |
4421 4422
			  SPP_PMTUD_ENABLE |
			  SPP_SACKDELAY_ENABLE;
L
Linus Torvalds 已提交
4423 4424 4425 4426 4427 4428

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

4429 4430
	/* Enable Nagle algorithm by default.  */
	sp->nodelay           = 0;
L
Linus Torvalds 已提交
4431

4432
	sp->recvrcvinfo = 0;
4433
	sp->recvnxtinfo = 0;
4434

L
Linus Torvalds 已提交
4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447
	/* 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;

4448
	sp->adaptation_ind = 0;
L
Linus Torvalds 已提交
4449 4450 4451 4452

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

	/* Control variables for partial data delivery. */
4453
	atomic_set(&sp->pd_mode, 0);
L
Linus Torvalds 已提交
4454
	skb_queue_head_init(&sp->pd_lobby);
4455
	sp->frag_interleave = 0;
L
Linus Torvalds 已提交
4456 4457 4458 4459 4460

	/* 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.
	 */
4461 4462
	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
	if (!sp->ep)
L
Linus Torvalds 已提交
4463 4464 4465 4466
		return -ENOMEM;

	sp->hmac = NULL;

4467 4468
	sk->sk_destruct = sctp_destruct_sock;

L
Linus Torvalds 已提交
4469
	SCTP_DBG_OBJCNT_INC(sock);
4470 4471

	local_bh_disable();
4472
	sk_sockets_allocated_inc(sk);
4473
	sock_prot_inuse_add(net, sk->sk_prot, 1);
4474 4475 4476 4477

	/* Nothing can fail after this block, otherwise
	 * sctp_destroy_sock() will be called without addr_wq_lock held
	 */
4478
	if (net->sctp.default_auto_asconf) {
4479
		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4480
		list_add_tail(&sp->auto_asconf_list,
4481
		    &net->sctp.auto_asconf_splist);
4482
		sp->do_auto_asconf = 1;
4483 4484
		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
	} else {
4485
		sp->do_auto_asconf = 0;
4486 4487
	}

4488 4489
	local_bh_enable();

L
Linus Torvalds 已提交
4490 4491 4492
	return 0;
}

4493 4494 4495
/* 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
 */
4496
static void sctp_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
4497
{
4498
	struct sctp_sock *sp;
L
Linus Torvalds 已提交
4499

4500
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4501 4502

	/* Release our hold on the endpoint. */
4503
	sp = sctp_sk(sk);
4504 4505 4506 4507 4508 4509
	/* 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;

4510 4511 4512 4513 4514
	if (sp->do_auto_asconf) {
		sp->do_auto_asconf = 0;
		list_del(&sp->auto_asconf_list);
	}
	sctp_endpoint_free(sp->ep);
4515
	local_bh_disable();
4516
	sk_sockets_allocated_dec(sk);
4517
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4518
	local_bh_enable();
L
Linus Torvalds 已提交
4519 4520
}

4521 4522 4523 4524 4525 4526
/* 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
4527
	crypto_free_shash(sp->hmac);
4528 4529 4530 4531

	inet_sock_destruct(sk);
}

L
Linus Torvalds 已提交
4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547
/* 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.
 */
4548
static void sctp_shutdown(struct sock *sk, int how)
L
Linus Torvalds 已提交
4549
{
4550
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4551 4552 4553 4554 4555
	struct sctp_endpoint *ep;

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

4556 4557 4558 4559
	ep = sctp_sk(sk)->ep;
	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
		struct sctp_association *asoc;

4560
		inet_sk_set_state(sk, SCTP_SS_CLOSING);
4561 4562 4563
		asoc = list_entry(ep->asocs.next,
				  struct sctp_association, asocs);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
4564 4565 4566
	}
}

4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584
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;
4585
		info->sctpi_s_type = sp->type;
4586 4587 4588 4589 4590 4591 4592 4593 4594

		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);
4595 4596
	info->sctpi_instrms = asoc->stream.incnt;
	info->sctpi_outstrms = asoc->stream.outcnt;
4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635
	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;
4636
	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652
	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);

4653
/* use callback to avoid exporting the core structure */
4654
void sctp_transport_walk_start(struct rhashtable_iter *iter)
4655
{
4656
	rhltable_walk_enter(&sctp_transport_hashtable, iter);
4657

4658
	rhashtable_walk_start(iter);
4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709
}

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++) {
4710
		read_lock_bh(&head->lock);
4711 4712 4713 4714 4715
		sctp_for_each_hentry(epb, &head->chain) {
			err = cb(sctp_ep(epb), p);
			if (err)
				break;
		}
4716
		read_unlock_bh(&head->lock);
4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728
	}

	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;
4729
	int err;
4730 4731 4732

	rcu_read_lock();
	transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4733
	rcu_read_unlock();
4734
	if (!transport)
4735
		return -ENOENT;
4736 4737

	err = cb(transport, p);
4738
	sctp_transport_put(transport);
4739

4740 4741 4742 4743 4744
	return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);

int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4745 4746
			    int (*cb_done)(struct sctp_transport *, void *),
			    struct net *net, int *pos, void *p) {
4747
	struct rhashtable_iter hti;
4748 4749
	struct sctp_transport *tsp;
	int ret;
4750

4751
again:
4752
	ret = 0;
4753
	sctp_transport_walk_start(&hti);
4754

4755 4756 4757
	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))
4758
			continue;
4759 4760
		ret = cb(tsp, p);
		if (ret)
4761
			break;
4762 4763
		(*pos)++;
		sctp_transport_put(tsp);
4764 4765
	}
	sctp_transport_walk_stop(&hti);
4766

4767 4768 4769 4770 4771 4772 4773 4774 4775 4776
	if (ret) {
		if (cb_done && !cb_done(tsp, p)) {
			(*pos)++;
			sctp_transport_put(tsp);
			goto again;
		}
		sctp_transport_put(tsp);
	}

	return ret;
4777 4778 4779
}
EXPORT_SYMBOL_GPL(sctp_for_each_transport);

L
Linus Torvalds 已提交
4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796
/* 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;

4797
	if (len < sizeof(status)) {
L
Linus Torvalds 已提交
4798 4799 4800 4801
		retval = -EINVAL;
		goto out;
	}

4802 4803
	len = sizeof(status);
	if (copy_from_user(&status, optval, len)) {
L
Linus Torvalds 已提交
4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817
		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);
4818
	status.sstat_state = sctp_assoc_to_state(asoc);
L
Linus Torvalds 已提交
4819 4820 4821 4822
	status.sstat_rwnd =  asoc->peer.rwnd;
	status.sstat_unackdata = asoc->unack_data;

	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4823 4824
	status.sstat_instrms = asoc->stream.incnt;
	status.sstat_outstrms = asoc->stream.outcnt;
L
Linus Torvalds 已提交
4825 4826
	status.sstat_fragmentation_point = asoc->frag_point;
	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4827 4828
	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
			transport->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
4829
	/* Map ipv4 address into v4-mapped-on-v6 address.  */
4830
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
4831
		(union sctp_addr *)&status.sstat_primary.spinfo_address);
F
Frank Filz 已提交
4832
	status.sstat_primary.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4833 4834 4835
	status.sstat_primary.spinfo_cwnd = transport->cwnd;
	status.sstat_primary.spinfo_srtt = transport->srtt;
	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4836
	status.sstat_primary.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4837

F
Frank Filz 已提交
4838 4839 4840
	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
		status.sstat_primary.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4841 4842 4843 4844 4845
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

4846 4847 4848
	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
4849 4850 4851 4852 4853 4854 4855

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

out:
E
Eric Dumazet 已提交
4856
	return retval;
L
Linus Torvalds 已提交
4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874
}


/* 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;

4875
	if (len < sizeof(pinfo)) {
L
Linus Torvalds 已提交
4876 4877 4878 4879
		retval = -EINVAL;
		goto out;
	}

4880 4881
	len = sizeof(pinfo);
	if (copy_from_user(&pinfo, optval, len)) {
L
Linus Torvalds 已提交
4882 4883 4884 4885 4886 4887 4888 4889 4890 4891
		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
4892
	pinfo.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4893 4894 4895
	pinfo.spinfo_cwnd = transport->cwnd;
	pinfo.spinfo_srtt = transport->srtt;
	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4896
	pinfo.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4897

F
Frank Filz 已提交
4898 4899 4900
	if (pinfo.spinfo_state == SCTP_UNKNOWN)
		pinfo.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911
	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
4912
	return retval;
L
Linus Torvalds 已提交
4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946
}

/* 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
4947
	if (len == 0)
L
Linus Torvalds 已提交
4948
		return -EINVAL;
4949 4950
	if (len > sizeof(struct sctp_event_subscribe))
		len = sizeof(struct sctp_event_subscribe);
4951 4952
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973
	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;
4974
	if (len < sizeof(int))
L
Linus Torvalds 已提交
4975
		return -EINVAL;
4976 4977 4978
	len = sizeof(int);
	if (put_user(len, optlen))
		return -EFAULT;
4979
	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
L
Linus Torvalds 已提交
4980 4981 4982 4983 4984
		return -EFAULT;
	return 0;
}

/* Helper routine to branch off an association to a new socket.  */
B
Benjamin Poirier 已提交
4985
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
L
Linus Torvalds 已提交
4986
{
B
Benjamin Poirier 已提交
4987
	struct sctp_association *asoc = sctp_id2assoc(sk, id);
4988
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
4989 4990 4991
	struct socket *sock;
	int err = 0;

4992 4993 4994 4995
	/* 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
4996 4997 4998
	if (!asoc)
		return -EINVAL;

L
Linus Torvalds 已提交
4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009
	/* 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;

5010
	sctp_copy_sock(sock->sk, sk, asoc);
5011 5012 5013 5014

	/* Make peeled-off sockets more like 1-1 accepted sockets.
	 * Set the daddr and initialize id to something more random
	 */
5015
	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5016 5017 5018 5019 5020

	/* 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);
5021

L
Linus Torvalds 已提交
5022 5023 5024 5025
	*sockp = sock;

	return err;
}
B
Benjamin Poirier 已提交
5026
EXPORT_SYMBOL(sctp_do_peeloff);
L
Linus Torvalds 已提交
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 5060 5061 5062 5063
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
5064 5065 5066
static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	sctp_peeloff_arg_t peeloff;
5067
	struct file *newfile = NULL;
L
Linus Torvalds 已提交
5068 5069
	int retval = 0;

5070
	if (len < sizeof(sctp_peeloff_arg_t))
L
Linus Torvalds 已提交
5071
		return -EINVAL;
5072
	len = sizeof(sctp_peeloff_arg_t);
L
Linus Torvalds 已提交
5073 5074 5075
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

5076
	retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
L
Linus Torvalds 已提交
5077 5078 5079
	if (retval < 0)
		goto out;

5080 5081 5082 5083 5084
	/* 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
5085 5086
	}

5087 5088
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
5089
		put_unused_fd(retval);
5090
		return -EFAULT;
5091
	}
5092 5093 5094 5095
	fd_install(retval, newfile);
out:
	return retval;
}
5096

5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113
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
5114 5115

	/* Return the fd mapped to the new socket.  */
5116 5117 5118 5119 5120
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
	}
5121

5122 5123 5124
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
		put_unused_fd(retval);
5125
		return -EFAULT;
5126 5127
	}
	fd_install(retval, newfile);
L
Linus Torvalds 已提交
5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141
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 {
5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153
 *     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
5154 5155
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
5156 5157 5158
 *                     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
5159 5160
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223
 *                     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
5224 5225
 */
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5226
					    char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
5227
{
5228 5229 5230 5231
	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
5232

5233
	if (len < sizeof(struct sctp_paddrparams))
L
Linus Torvalds 已提交
5234
		return -EINVAL;
5235
	len = sizeof(struct sctp_paddrparams);
L
Linus Torvalds 已提交
5236 5237 5238
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

5239 5240
	/* 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
5241
	 */
5242
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5243 5244 5245
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans) {
5246
			pr_debug("%s: failed no transport\n", __func__);
5247 5248
			return -EINVAL;
		}
L
Linus Torvalds 已提交
5249 5250
	}

5251 5252 5253 5254 5255 5256
	/* 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)) {
5257
		pr_debug("%s: failed no association\n", __func__);
L
Linus Torvalds 已提交
5258
		return -EINVAL;
5259
	}
L
Linus Torvalds 已提交
5260

5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284
	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
5285

5286 5287 5288
		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = sp->param_flags;
	}
L
Linus Torvalds 已提交
5289 5290 5291 5292 5293 5294 5295 5296 5297 5298

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

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

	return 0;
}

5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317
/*
 * 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;
 * };
5318
 *
5319 5320 5321 5322
 * 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).
5323
 *
5324 5325 5326 5327
 * 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.
5328
 *
5329 5330 5331 5332
 * 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.
5333
 */
5334
static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5335 5336 5337
					    char __user *optval,
					    int __user *optlen)
{
5338
	struct sctp_sack_info    params;
5339 5340 5341
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

5342 5343
	if (len >= sizeof(struct sctp_sack_info)) {
		len = sizeof(struct sctp_sack_info);
5344

5345 5346 5347
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else if (len == sizeof(struct sctp_assoc_value)) {
5348
		pr_warn_ratelimited(DEPRECATED
5349
				    "%s (pid %d) "
5350
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5351 5352
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
5353 5354 5355
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
5356
		return -EINVAL;
5357

5358
	/* Get association, if sack_assoc_id != 0 and the socket is a one
5359 5360
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
5361
	 */
5362 5363
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5364 5365 5366 5367
		return -EINVAL;

	if (asoc) {
		/* Fetch association values. */
5368 5369
		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay = jiffies_to_msecs(
5370
				asoc->sackdelay);
5371 5372 5373 5374 5375 5376
			params.sack_freq = asoc->sackfreq;

		} else {
			params.sack_delay = 0;
			params.sack_freq = 1;
		}
5377 5378
	} else {
		/* Fetch socket values. */
5379 5380 5381 5382 5383 5384 5385
		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;
		}
5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396
	}

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

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

	return 0;
}

L
Linus Torvalds 已提交
5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409
/* 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)
{
5410
	if (len < sizeof(struct sctp_initmsg))
L
Linus Torvalds 已提交
5411
		return -EINVAL;
5412 5413 5414
	len = sizeof(struct sctp_initmsg);
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5415 5416 5417 5418 5419
	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
		return -EFAULT;
	return 0;
}

5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445

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;

5446 5447
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5448

5449 5450
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
				transports) {
5451
		memcpy(&temp, &from->ipaddr, sizeof(temp));
5452 5453
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5454
		if (space_left < addrlen)
5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466
			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
5467 5468 5469 5470 5471
		return -EFAULT;

	return 0;
}

5472 5473
static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
			    size_t space_left, int *bytes_copied)
5474 5475 5476 5477 5478
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr temp;
	int cnt = 0;
	int addrlen;
5479
	struct net *net = sock_net(sk);
5480

5481
	rcu_read_lock();
5482
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5483 5484 5485
		if (!addr->valid)
			continue;

5486
		if ((PF_INET == sk->sk_family) &&
5487
		    (AF_INET6 == addr->a.sa.sa_family))
5488
			continue;
5489 5490 5491 5492
		if ((PF_INET6 == sk->sk_family) &&
		    inet_v6_ipv6only(sk) &&
		    (AF_INET == addr->a.sa.sa_family))
			continue;
5493
		memcpy(&temp, &addr->a, sizeof(temp));
5494 5495 5496
		if (!temp.v4.sin_port)
			temp.v4.sin_port = htons(port);

5497 5498 5499
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sctp_sk(sk), &temp);

5500 5501 5502 5503
		if (space_left < addrlen) {
			cnt =  -ENOMEM;
			break;
		}
5504
		memcpy(to, &temp, addrlen);
5505

5506
		to += addrlen;
5507
		cnt++;
5508
		space_left -= addrlen;
5509
		*bytes_copied += addrlen;
5510
	}
5511
	rcu_read_unlock();
5512 5513 5514 5515

	return cnt;
}

L
Linus Torvalds 已提交
5516

5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530
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;
5531 5532
	int bytes_copied = 0;
	void *addrs;
5533
	void *buf;
5534

5535
	if (len < sizeof(struct sctp_getaddrs))
5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555
		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;
	}

5556 5557
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5558

5559
	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5560 5561
	if (!addrs)
		return -ENOMEM;
5562 5563 5564 5565 5566 5567 5568

	/* 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);
5569
		if (sctp_is_any(sk, &addr->a)) {
5570 5571
			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
						space_left, &bytes_copied);
5572 5573
			if (cnt < 0) {
				err = cnt;
5574
				goto out;
5575
			}
5576
			goto copy_getaddrs;
5577 5578 5579
		}
	}

5580
	buf = addrs;
5581 5582 5583 5584 5585
	/* 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) {
5586
		memcpy(&temp, &addr->a, sizeof(temp));
5587 5588
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5589 5590
		if (space_left < addrlen) {
			err =  -ENOMEM; /*fixme: right error?*/
5591
			goto out;
5592
		}
5593 5594
		memcpy(buf, &temp, addrlen);
		buf += addrlen;
5595
		bytes_copied += addrlen;
5596
		cnt++;
5597 5598 5599 5600
		space_left -= addrlen;
	}

copy_getaddrs:
5601 5602
	if (copy_to_user(to, addrs, bytes_copied)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5603
		goto out;
5604
	}
5605 5606
	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5607
		goto out;
5608
	}
5609 5610 5611
	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
	 * but we can't change it anymore.
	 */
5612
	if (put_user(bytes_copied, optlen))
5613
		err = -EFAULT;
S
Sebastian Siewior 已提交
5614
out:
5615
	kfree(addrs);
5616 5617 5618
	return err;
}

L
Linus Torvalds 已提交
5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631
/* 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);

5632
	if (len < sizeof(struct sctp_prim))
L
Linus Torvalds 已提交
5633 5634
		return -EINVAL;

5635 5636 5637
	len = sizeof(struct sctp_prim);

	if (copy_from_user(&prim, optval, len))
L
Linus Torvalds 已提交
5638 5639 5640 5641 5642 5643 5644 5645
		return -EFAULT;

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

	if (!asoc->peer.primary_path)
		return -ENOTCONN;
5646

5647 5648
	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
		asoc->peer.primary_path->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
5649

5650
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
L
Linus Torvalds 已提交
5651 5652
			(union sctp_addr *)&prim.ssp_addr);

5653 5654 5655
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &prim, len))
L
Linus Torvalds 已提交
5656 5657 5658 5659 5660 5661
		return -EFAULT;

	return 0;
}

/*
5662
 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
L
Linus Torvalds 已提交
5663
 *
5664
 * Requests that the local endpoint set the specified Adaptation Layer
L
Linus Torvalds 已提交
5665 5666
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
5667
static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
L
Linus Torvalds 已提交
5668 5669
				  char __user *optval, int __user *optlen)
{
5670
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
5671

5672
	if (len < sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
5673 5674
		return -EINVAL;

5675 5676
	len = sizeof(struct sctp_setadaptation);

5677
	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5678 5679 5680

	if (put_user(len, optlen))
		return -EFAULT;
5681
	if (copy_to_user(optval, &adaptation, len))
L
Linus Torvalds 已提交
5682
		return -EFAULT;
5683

L
Linus Torvalds 已提交
5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710
	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);
5711 5712
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
5713

5714
	if (len < sizeof(info))
L
Linus Torvalds 已提交
5715
		return -EINVAL;
5716

5717
	len = sizeof(info);
5718 5719

	if (copy_from_user(&info, optval, len))
L
Linus Torvalds 已提交
5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738
		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;
	}

5739 5740 5741
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
L
Linus Torvalds 已提交
5742 5743 5744 5745 5746
		return -EFAULT;

	return 0;
}

5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788
/* 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
5789 5790 5791 5792 5793 5794 5795 5796 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 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833
/*
 *
 * 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;

5834
	if (len < sizeof (struct sctp_rtoinfo))
L
Linus Torvalds 已提交
5835 5836
		return -EINVAL;

5837 5838 5839
	len = sizeof(struct sctp_rtoinfo);

	if (copy_from_user(&rtoinfo, optval, len))
L
Linus Torvalds 已提交
5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873
		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
 *
5874
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890
 * 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;

5891
	if (len < sizeof (struct sctp_assocparams))
L
Linus Torvalds 已提交
5892 5893
		return -EINVAL;

5894 5895 5896
	len = sizeof(struct sctp_assocparams);

	if (copy_from_user(&assocparams, optval, len))
L
Linus Torvalds 已提交
5897 5898 5899 5900 5901 5902 5903 5904
		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 */
5905
	if (asoc) {
L
Linus Torvalds 已提交
5906 5907 5908
		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5909
		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
L
Linus Torvalds 已提交
5910 5911

		list_for_each(pos, &asoc->peer.transport_addr_list) {
5912
			cnt++;
L
Linus Torvalds 已提交
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 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967
		}

		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;
}

5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978
/*
 * 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;

5979
	if (len < sizeof(struct sctp_assoc_value))
5980 5981
		return -EINVAL;

5982 5983
	len = sizeof(struct sctp_assoc_value);

5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005
	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
6006
/*
6007 6008 6009
 * 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
6010 6011 6012
 * 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
6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031
 * 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
6032 6033 6034 6035
 */
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
				  char __user *optval, int __user *optlen)
{
6036 6037
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
L
Linus Torvalds 已提交
6038

6039
	if (len == sizeof(int)) {
6040
		pr_warn_ratelimited(DEPRECATED
6041
				    "%s (pid %d) "
6042
				    "Use of int in maxseg socket option.\n"
6043 6044
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6045 6046 6047
		params.assoc_id = 0;
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6048
		if (copy_from_user(&params, optval, len))
6049 6050
			return -EFAULT;
	} else
L
Linus Torvalds 已提交
6051 6052
		return -EINVAL;

6053 6054 6055 6056 6057 6058 6059 6060
	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
6061 6062 6063

	if (put_user(len, optlen))
		return -EFAULT;
6064 6065 6066 6067 6068 6069 6070
	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
6071 6072 6073 6074

	return 0;
}

6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097
/*
 * 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;
}

6098 6099 6100 6101 6102 6103 6104 6105
/*
 * 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)
{
6106
	u32 val;
6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118

	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;

6119
	return 0;
6120 6121
}

6122 6123 6124 6125 6126 6127 6128 6129
/*
 * 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)
{
6130 6131 6132
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
6133

6134
	if (len == sizeof(int)) {
6135
		pr_warn_ratelimited(DEPRECATED
6136
				    "%s (pid %d) "
6137
				    "Use of int in max_burst socket option.\n"
6138 6139
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6140
		params.assoc_id = 0;
6141 6142
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6143 6144 6145 6146
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
		return -EINVAL;
6147

6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166
	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;
6167 6168 6169

}

6170 6171 6172
static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6173
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6174
	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6175
	struct sctp_hmac_algo_param *hmacs;
6176 6177
	__u16 data_len = 0;
	u32 num_idents;
6178
	int i;
6179

6180
	if (!ep->auth_enable)
6181
		return -EACCES;
6182

6183
	hmacs = ep->auth_hmacs_list;
6184 6185
	data_len = ntohs(hmacs->param_hdr.length) -
		   sizeof(struct sctp_paramhdr);
6186

6187
	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6188
		return -EINVAL;
6189 6190 6191 6192

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

6193 6194
	if (put_user(len, optlen))
		return -EFAULT;
6195 6196
	if (put_user(num_idents, &p->shmac_num_idents))
		return -EFAULT;
6197 6198 6199 6200 6201 6202
	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;
	}
6203 6204 6205 6206 6207 6208
	return 0;
}

static int sctp_getsockopt_active_key(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6209
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6210 6211 6212
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

6213
	if (!ep->auth_enable)
6214 6215
		return -EACCES;

6216 6217
	if (len < sizeof(struct sctp_authkeyid))
		return -EINVAL;
6218 6219 6220

	len = sizeof(struct sctp_authkeyid);
	if (copy_from_user(&val, optval, len))
6221 6222 6223 6224 6225 6226 6227 6228 6229
		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
6230
		val.scact_keynumber = ep->active_key_id;
6231

6232 6233 6234 6235 6236
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6237 6238 6239 6240 6241 6242
	return 0;
}

static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6243
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6244
	struct sctp_authchunks __user *p = (void __user *)optval;
6245 6246 6247
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6248
	u32    num_chunks = 0;
6249 6250
	char __user *to;

6251
	if (!ep->auth_enable)
6252 6253 6254
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6255 6256
		return -EINVAL;

6257
	if (copy_from_user(&val, optval, sizeof(val)))
6258 6259
		return -EFAULT;

A
Al Viro 已提交
6260
	to = p->gauth_chunks;
6261 6262 6263 6264 6265
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc)
		return -EINVAL;

	ch = asoc->peer.peer_chunks;
6266 6267
	if (!ch)
		goto num;
6268 6269

	/* See if the user provided enough room for all the data */
6270
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6271
	if (len < num_chunks)
6272 6273
		return -EINVAL;

6274
	if (copy_to_user(to, ch->chunks, num_chunks))
6275
		return -EFAULT;
6276 6277
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6278 6279
	if (put_user(len, optlen))
		return -EFAULT;
6280 6281
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6282 6283 6284 6285 6286 6287
	return 0;
}

static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6288
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6289
	struct sctp_authchunks __user *p = (void __user *)optval;
6290 6291 6292
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6293
	u32    num_chunks = 0;
6294 6295
	char __user *to;

6296
	if (!ep->auth_enable)
6297 6298 6299
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6300 6301
		return -EINVAL;

6302
	if (copy_from_user(&val, optval, sizeof(val)))
6303 6304
		return -EFAULT;

A
Al Viro 已提交
6305
	to = p->gauth_chunks;
6306 6307 6308 6309 6310
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
6311
		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6312
	else
6313
		ch = ep->auth_chunk_list;
6314

6315 6316 6317
	if (!ch)
		goto num;

6318
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6319
	if (len < sizeof(struct sctp_authchunks) + num_chunks)
6320 6321
		return -EINVAL;

6322 6323 6324 6325
	if (copy_to_user(to, ch->chunks, num_chunks))
		return -EFAULT;
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6326 6327
	if (put_user(len, optlen))
		return -EFAULT;
6328 6329
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6330 6331 6332 6333

	return 0;
}

6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365
/*
 * 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;
}

6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387
/*
 * 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;
}

6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417
/*
 * 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;

6418
	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436
	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;
}

6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 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 6479 6480 6481
/*
 * 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;
}

6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498
/*
 * 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;

6499 6500 6501
	/* Allow the struct to grow and fill in as much as possible */
	len = min_t(size_t, len, sizeof(sas));

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 6531 6532 6533 6534 6535 6536 6537
	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;

6538
	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6539 6540 6541 6542 6543 6544 6545

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

	return 0;
}

6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565
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;
}

6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585
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;
}

6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626
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;
}

6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669
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;
}

6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 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
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;
}

6728 6729 6730 6731
static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
6732
	struct sctp_stream_out_ext *streamoute;
6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751
	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);
6752
	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6753 6754
		goto out;

6755 6756 6757 6758 6759 6760 6761 6762 6763
	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;
	}

6764 6765 6766 6767 6768
	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 +=
6769
				streamoute->abandoned_unsent[policy];
6770
			params.sprstat_abandoned_sent +=
6771
				streamoute->abandoned_sent[policy];
6772 6773 6774
		}
	} else {
		params.sprstat_abandoned_unsent =
6775
			streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6776
		params.sprstat_abandoned_sent =
6777
			streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790
	}

	if (put_user(len, optlen) || copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

	retval = 0;

out:
	return retval;
}

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
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;
}

6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872
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;
}

6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909
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;
}

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 6945 6946 6947 6948 6949 6950 6951
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;
}

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 6986 6987 6988 6989 6990 6991 6992
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;
}

6993 6994
static int sctp_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
6995 6996 6997 6998
{
	int retval = 0;
	int len;

6999
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
7000 7001 7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016

	/* 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
7017 7018 7019
	if (len < 0)
		return -EINVAL;

7020
	lock_sock(sk);
L
Linus Torvalds 已提交
7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038

	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;
7039 7040 7041
	case SCTP_SOCKOPT_PEELOFF_FLAGS:
		retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7042 7043 7044 7045
	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
							  optlen);
		break;
7046
	case SCTP_DELAYED_SACK:
7047
		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7048 7049
							  optlen);
		break;
L
Linus Torvalds 已提交
7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060
	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;
7061 7062 7063
	case SCTP_SOCKOPT_CONNECTX3:
		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7064 7065 7066 7067
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_getsockopt_default_send_param(sk, len,
							    optval, optlen);
		break;
7068 7069 7070 7071
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_getsockopt_default_sndinfo(sk, len,
							 optval, optlen);
		break;
L
Linus Torvalds 已提交
7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093
	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;
7094 7095
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
L
Linus Torvalds 已提交
7096 7097
							optlen);
		break;
7098 7099 7100
	case SCTP_CONTEXT:
		retval = sctp_getsockopt_context(sk, len, optval, optlen);
		break;
7101 7102 7103 7104
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
							     optlen);
		break;
7105 7106 7107 7108
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
								optlen);
		break;
7109 7110 7111
	case SCTP_MAX_BURST:
		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
		break;
7112 7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129 7130
	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;
7131 7132 7133
	case SCTP_GET_ASSOC_NUMBER:
		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
		break;
7134 7135 7136
	case SCTP_GET_ASSOC_ID_LIST:
		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
		break;
7137 7138 7139
	case SCTP_AUTO_ASCONF:
		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
		break;
7140 7141 7142
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
		break;
7143 7144 7145
	case SCTP_GET_ASSOC_STATS:
		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
		break;
7146 7147 7148
	case SCTP_RECVRCVINFO:
		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
		break;
7149 7150 7151
	case SCTP_RECVNXTINFO:
		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
		break;
7152 7153 7154
	case SCTP_PR_SUPPORTED:
		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
		break;
7155 7156 7157 7158
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
							optlen);
		break;
7159 7160 7161 7162
	case SCTP_PR_ASSOC_STATUS:
		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
							optlen);
		break;
7163 7164 7165 7166
	case SCTP_PR_STREAM_STATUS:
		retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
							 optlen);
		break;
7167 7168 7169 7170
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
							    optlen);
		break;
7171 7172 7173 7174
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
							 optlen);
		break;
7175 7176 7177 7178
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_getsockopt_scheduler(sk, len, optval,
						   optlen);
		break;
7179 7180 7181 7182
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_getsockopt_scheduler_value(sk, len, optval,
							 optlen);
		break;
7183 7184 7185 7186
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
7187 7188 7189
	default:
		retval = -ENOPROTOOPT;
		break;
7190
	}
L
Linus Torvalds 已提交
7191

7192
	release_sock(sk);
L
Linus Torvalds 已提交
7193 7194 7195
	return retval;
}

7196
static int sctp_hash(struct sock *sk)
L
Linus Torvalds 已提交
7197 7198
{
	/* STUB */
7199
	return 0;
L
Linus Torvalds 已提交
7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219
}

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(
7220
	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
L
Linus Torvalds 已提交
7221 7222 7223 7224

static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
{
	struct sctp_bind_hashbucket *head; /* hash list */
7225
	struct sctp_bind_bucket *pp;
L
Linus Torvalds 已提交
7226 7227 7228
	unsigned short snum;
	int ret;

A
Al Viro 已提交
7229
	snum = ntohs(addr->v4.sin_port);
L
Linus Torvalds 已提交
7230

7231 7232
	pr_debug("%s: begins, snum:%d\n", __func__, snum);

7233
	local_bh_disable();
L
Linus Torvalds 已提交
7234 7235

	if (snum == 0) {
S
Stephen Hemminger 已提交
7236
		/* Search for an available port. */
7237 7238
		int low, high, remaining, index;
		unsigned int rover;
7239
		struct net *net = sock_net(sk);
7240

7241
		inet_get_local_port_range(net, &low, &high);
7242
		remaining = (high - low) + 1;
7243
		rover = prandom_u32() % remaining + low;
L
Linus Torvalds 已提交
7244 7245 7246 7247 7248

		do {
			rover++;
			if ((rover < low) || (rover > high))
				rover = low;
7249
			if (inet_is_local_reserved_port(net, rover))
7250
				continue;
7251
			index = sctp_phashfn(sock_net(sk), rover);
L
Linus Torvalds 已提交
7252
			head = &sctp_port_hashtable[index];
7253
			spin_lock(&head->lock);
7254
			sctp_for_each_hentry(pp, &head->chain)
7255 7256
				if ((pp->port == rover) &&
				    net_eq(sock_net(sk), pp->net))
L
Linus Torvalds 已提交
7257 7258 7259
					goto next;
			break;
		next:
7260
			spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7261 7262 7263 7264 7265 7266 7267 7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279
		} 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.
		 */
7280
		head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7281
		spin_lock(&head->lock);
7282
		sctp_for_each_hentry(pp, &head->chain) {
7283
			if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
L
Linus Torvalds 已提交
7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298
				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;

7299 7300
		pr_debug("%s: found a possible match\n", __func__);

7301 7302
		if (pp->fastreuse && sk->sk_reuse &&
			sk->sk_state != SCTP_SS_LISTENING)
L
Linus Torvalds 已提交
7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314
			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.
		 */
7315
		sk_for_each_bound(sk2, &pp->owner) {
L
Linus Torvalds 已提交
7316 7317 7318
			struct sctp_endpoint *ep2;
			ep2 = sctp_sk(sk2)->ep;

7319 7320 7321
			if (sk == sk2 ||
			    (reuse && sk2->sk_reuse &&
			     sk2->sk_state != SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
7322 7323
				continue;

7324 7325
			if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
						 sctp_sk(sk2), sctp_sk(sk))) {
L
Linus Torvalds 已提交
7326 7327 7328 7329
				ret = (long)sk2;
				goto fail_unlock;
			}
		}
7330 7331

		pr_debug("%s: found a match\n", __func__);
L
Linus Torvalds 已提交
7332 7333 7334 7335
	}
pp_not_found:
	/* If there was a hash table miss, create a new port.  */
	ret = 1;
7336
	if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
L
Linus Torvalds 已提交
7337 7338 7339 7340 7341 7342
		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-).
	 */
7343 7344 7345 7346 7347 7348 7349
	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
7350 7351 7352 7353 7354 7355 7356 7357
		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
7358
		inet_sk(sk)->inet_num = snum;
L
Linus Torvalds 已提交
7359 7360 7361 7362 7363 7364
		sk_add_bind_node(sk, &pp->owner);
		sctp_sk(sk)->bind_hash = pp;
	}
	ret = 0;

fail_unlock:
7365
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7366 7367

fail:
7368
	local_bh_enable();
L
Linus Torvalds 已提交
7369 7370 7371 7372 7373 7374 7375 7376 7377 7378 7379 7380 7381 7382 7383 7384
	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. */
7385
	return !!sctp_get_port_local(sk, &addr);
L
Linus Torvalds 已提交
7386 7387 7388
}

/*
7389
 *  Move a socket to LISTENING state.
L
Linus Torvalds 已提交
7390
 */
7391
static int sctp_listen_start(struct sock *sk, int backlog)
L
Linus Torvalds 已提交
7392 7393 7394
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
H
Herbert Xu 已提交
7395
	struct crypto_shash *tfm = NULL;
7396
	char alg[32];
L
Linus Torvalds 已提交
7397

7398
	/* Allocate HMAC for generating cookie. */
7399 7400
	if (!sp->hmac && sp->sctp_hmac_alg) {
		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
H
Herbert Xu 已提交
7401
		tfm = crypto_alloc_shash(alg, 0, 0);
7402
		if (IS_ERR(tfm)) {
7403
			net_info_ratelimited("failed to load transform for %s: %ld\n",
7404
					     sp->sctp_hmac_alg, PTR_ERR(tfm));
7405 7406 7407
			return -ENOSYS;
		}
		sctp_sk(sk)->hmac = tfm;
L
Linus Torvalds 已提交
7408 7409 7410 7411 7412 7413 7414 7415 7416 7417 7418
	}

	/*
	 * 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.
7419
	 *
L
Linus Torvalds 已提交
7420
	 */
7421
	inet_sk_set_state(sk, SCTP_SS_LISTENING);
L
Linus Torvalds 已提交
7422 7423 7424
	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
7425
	} else {
E
Eric Dumazet 已提交
7426
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7427
			inet_sk_set_state(sk, SCTP_SS_CLOSED);
7428 7429 7430
			return -EADDRINUSE;
		}
	}
7431

L
Linus Torvalds 已提交
7432 7433 7434 7435 7436 7437
	sk->sk_max_ack_backlog = backlog;
	sctp_hash_endpoint(ep);
	return 0;
}

/*
7438 7439 7440 7441 7442 7443 7444 7445 7446 7447 7448
 * 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
7449 7450 7451 7452 7453
 *  Move a socket to LISTENING state.
 */
int sctp_inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
7454
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
L
Linus Torvalds 已提交
7455 7456 7457
	int err = -EINVAL;

	if (unlikely(backlog < 0))
7458
		return err;
L
Linus Torvalds 已提交
7459

7460
	lock_sock(sk);
L
Linus Torvalds 已提交
7461

7462 7463 7464 7465
	/* Peeled-off sockets are not allowed to listen().  */
	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
		goto out;

L
Linus Torvalds 已提交
7466 7467 7468
	if (sock->state != SS_UNCONNECTED)
		goto out;

7469 7470 7471
	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
		goto out;

7472 7473 7474
	/* If backlog is zero, disable listening. */
	if (!backlog) {
		if (sctp_sstate(sk, CLOSED))
L
Linus Torvalds 已提交
7475 7476
			goto out;

7477 7478 7479 7480 7481 7482
		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;
7483 7484
	}

7485 7486 7487 7488 7489 7490 7491 7492
	/* 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
7493

7494
	err = 0;
L
Linus Torvalds 已提交
7495
out:
7496
	release_sock(sk);
L
Linus Torvalds 已提交
7497 7498 7499 7500 7501 7502 7503 7504
	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
7505
 * the integrity of the counters (sndbuf and wmem_alloc) used
L
Linus Torvalds 已提交
7506 7507 7508 7509 7510 7511 7512
 * 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.
 */
A
Al Viro 已提交
7513
__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
L
Linus Torvalds 已提交
7514 7515 7516
{
	struct sock *sk = sock->sk;
	struct sctp_sock *sp = sctp_sk(sk);
A
Al Viro 已提交
7517
	__poll_t mask;
L
Linus Torvalds 已提交
7518

E
Eric Dumazet 已提交
7519
	poll_wait(file, sk_sleep(sk), wait);
L
Linus Torvalds 已提交
7520

7521 7522
	sock_rps_record_flow(sk);

L
Linus Torvalds 已提交
7523 7524 7525 7526 7527
	/* 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)) ?
7528
			(EPOLLIN | EPOLLRDNORM) : 0;
L
Linus Torvalds 已提交
7529 7530 7531 7532 7533

	mask = 0;

	/* Is there any exceptional events?  */
	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7534 7535
		mask |= EPOLLERR |
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
7536
	if (sk->sk_shutdown & RCV_SHUTDOWN)
7537
		mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
L
Linus Torvalds 已提交
7538
	if (sk->sk_shutdown == SHUTDOWN_MASK)
7539
		mask |= EPOLLHUP;
L
Linus Torvalds 已提交
7540 7541

	/* Is it readable?  Reconsider this code with TCP-style support.  */
E
Eric Dumazet 已提交
7542
	if (!skb_queue_empty(&sk->sk_receive_queue))
7543
		mask |= EPOLLIN | EPOLLRDNORM;
L
Linus Torvalds 已提交
7544 7545 7546 7547 7548 7549 7550

	/* 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)) {
7551
		mask |= EPOLLOUT | EPOLLWRNORM;
L
Linus Torvalds 已提交
7552
	} else {
7553
		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
L
Linus Torvalds 已提交
7554 7555 7556 7557 7558 7559 7560 7561 7562
		/*
		 * 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))
7563
			mask |= EPOLLOUT | EPOLLWRNORM;
L
Linus Torvalds 已提交
7564 7565 7566 7567 7568 7569 7570 7571 7572
	}
	return mask;
}

/********************************************************************
 * 2nd Level Abstractions
 ********************************************************************/

static struct sctp_bind_bucket *sctp_bucket_create(
7573
	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
L
Linus Torvalds 已提交
7574 7575 7576
{
	struct sctp_bind_bucket *pp;

7577
	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
L
Linus Torvalds 已提交
7578
	if (pp) {
7579
		SCTP_DBG_OBJCNT_INC(bind_bucket);
L
Linus Torvalds 已提交
7580 7581 7582
		pp->port = snum;
		pp->fastreuse = 0;
		INIT_HLIST_HEAD(&pp->owner);
7583
		pp->net = net;
7584
		hlist_add_head(&pp->node, &head->chain);
L
Linus Torvalds 已提交
7585 7586 7587 7588 7589 7590 7591
	}
	return pp;
}

/* Caller must hold hashbucket lock for this tb with local BH disabled */
static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
{
7592
	if (pp && hlist_empty(&pp->owner)) {
7593
		__hlist_del(&pp->node);
L
Linus Torvalds 已提交
7594 7595 7596 7597 7598 7599 7600 7601 7602
		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 =
7603 7604
		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
						  inet_sk(sk)->inet_num)];
L
Linus Torvalds 已提交
7605 7606
	struct sctp_bind_bucket *pp;

7607
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
7608 7609 7610
	pp = sctp_sk(sk)->bind_hash;
	__sk_del_bind_node(sk);
	sctp_sk(sk)->bind_hash = NULL;
E
Eric Dumazet 已提交
7611
	inet_sk(sk)->inet_num = 0;
L
Linus Torvalds 已提交
7612
	sctp_bucket_destroy(pp);
7613
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7614 7615 7616 7617
}

void sctp_put_port(struct sock *sk)
{
7618
	local_bh_disable();
L
Linus Torvalds 已提交
7619
	__sctp_put_port(sk);
7620
	local_bh_enable();
L
Linus Torvalds 已提交
7621 7622 7623 7624 7625 7626 7627 7628 7629 7630 7631 7632
}

/*
 * 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
7633
	__be16 port;
L
Linus Torvalds 已提交
7634 7635 7636 7637

	/* Initialize a local sockaddr structure to INADDR_ANY. */
	af = sctp_sk(sk)->pf->af;

E
Eric Dumazet 已提交
7638
	port = htons(inet_sk(sk)->inet_num);
L
Linus Torvalds 已提交
7639 7640 7641 7642 7643 7644 7645 7646 7647 7648 7649 7650 7651 7652 7653 7654 7655 7656 7657 7658 7659 7660 7661 7662 7663 7664 7665 7666 7667 7668 7669 7670 7671 7672 7673 7674 7675 7676 7677 7678 7679 7680 7681 7682
	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
7683
static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
L
Linus Torvalds 已提交
7684
{
7685
	struct msghdr *my_msg = (struct msghdr *)msg;
X
Xin Long 已提交
7686
	struct cmsghdr *cmsg;
L
Linus Torvalds 已提交
7687

7688
	for_each_cmsghdr(cmsg, my_msg) {
7689
		if (!CMSG_OK(my_msg, cmsg))
L
Linus Torvalds 已提交
7690 7691 7692 7693 7694 7695 7696 7697 7698 7699
			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
7700
			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
L
Linus Torvalds 已提交
7701 7702 7703 7704 7705 7706 7707 7708 7709 7710 7711
			 *
			 * 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
			 */
7712
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
L
Linus Torvalds 已提交
7713
				return -EINVAL;
7714 7715

			cmsgs->init = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7716 7717 7718 7719
			break;

		case SCTP_SNDRCV:
			/* SCTP Socket API Extension
7720
			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
L
Linus Torvalds 已提交
7721 7722 7723 7724 7725 7726 7727 7728 7729
			 *
			 * 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
			 */
7730
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
L
Linus Torvalds 已提交
7731 7732
				return -EINVAL;

7733
			cmsgs->srinfo = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7734

7735
			if (cmsgs->srinfo->sinfo_flags &
7736
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
X
Xin Long 已提交
7737
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7738
			      SCTP_ABORT | SCTP_EOF))
L
Linus Torvalds 已提交
7739 7740 7741
				return -EINVAL;
			break;

7742 7743 7744 7745 7746 7747 7748 7749 7750 7751 7752 7753 7754 7755 7756 7757 7758 7759 7760
		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
7761
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7762 7763 7764
			      SCTP_ABORT | SCTP_EOF))
				return -EINVAL;
			break;
L
Linus Torvalds 已提交
7765 7766
		default:
			return -EINVAL;
7767
		}
L
Linus Torvalds 已提交
7768
	}
7769

L
Linus Torvalds 已提交
7770 7771 7772 7773 7774 7775 7776 7777
	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.
 */
7778
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
L
Linus Torvalds 已提交
7779 7780 7781 7782
{
	int error;
	DEFINE_WAIT(wait);

E
Eric Dumazet 已提交
7783
	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7784 7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795 7796 7797 7798 7799 7800 7801 7802 7803 7804 7805 7806 7807 7808 7809 7810 7811 7812 7813 7814

	/* 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.
	 */
7815
	release_sock(sk);
L
Linus Torvalds 已提交
7816
	*timeo_p = schedule_timeout(*timeo_p);
7817
	lock_sock(sk);
L
Linus Torvalds 已提交
7818 7819

ready:
E
Eric Dumazet 已提交
7820
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7821 7822 7823 7824 7825 7826
	return 0;

interrupted:
	error = sock_intr_errno(*timeo_p);

out:
E
Eric Dumazet 已提交
7827
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7828 7829 7830 7831 7832 7833 7834 7835
	*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.
 */
7836 7837
struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
				       int noblock, int *err)
L
Linus Torvalds 已提交
7838 7839 7840 7841 7842 7843 7844
{
	int error;
	struct sk_buff *skb;
	long timeo;

	timeo = sock_rcvtimeo(sk, noblock);

7845 7846
	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
		 MAX_SCHEDULE_TIMEOUT);
L
Linus Torvalds 已提交
7847 7848 7849 7850 7851 7852 7853

	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...
7854
		 *  However, this function was correct in any case. 8)
L
Linus Torvalds 已提交
7855 7856 7857 7858
		 */
		if (flags & MSG_PEEK) {
			skb = skb_peek(&sk->sk_receive_queue);
			if (skb)
7859
				refcount_inc(&skb->users);
L
Linus Torvalds 已提交
7860
		} else {
7861
			skb = __skb_dequeue(&sk->sk_receive_queue);
L
Linus Torvalds 已提交
7862 7863 7864 7865 7866
		}

		if (skb)
			return skb;

7867 7868 7869 7870 7871
		/* 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
7872 7873 7874
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;

7875 7876 7877 7878 7879 7880
		if (sk_can_busy_loop(sk)) {
			sk_busy_loop(sk, noblock);

			if (!skb_queue_empty(&sk->sk_receive_queue))
				continue;
		}
7881

L
Linus Torvalds 已提交
7882 7883 7884 7885 7886 7887 7888 7889 7890 7891 7892 7893 7894 7895 7896 7897 7898 7899
		/* 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;

7900 7901 7902 7903 7904
	if (sctp_wspace(asoc) <= 0)
		return;

	if (waitqueue_active(&asoc->wait))
		wake_up_interruptible(&asoc->wait);
L
Linus Torvalds 已提交
7905

7906 7907
	if (sctp_writeable(sk)) {
		struct socket_wq *wq;
7908

7909 7910 7911 7912 7913
		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
7914 7915 7916 7917 7918

			/* 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.
			 */
7919
			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7920
				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
7921
		}
7922
		rcu_read_unlock();
L
Linus Torvalds 已提交
7923 7924 7925
	}
}

7926 7927 7928 7929 7930 7931 7932 7933 7934 7935 7936
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);

7937 7938 7939 7940 7941 7942
	/* If association goes down and is just flushing its
	 * outq, then just normally notify others.
	 */
	if (asoc->base.dead)
		return sctp_write_space(sk);

7943 7944 7945 7946 7947 7948 7949 7950 7951 7952 7953 7954 7955 7956 7957 7958 7959 7960 7961 7962 7963 7964 7965
	/* 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
7966 7967 7968 7969 7970 7971
/* 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)
{
7972 7973 7974
	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
7975

7976 7977 7978 7979
	asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

7980
	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
7981

7982
	/*
7983
	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7984 7985
	 */
	sk->sk_wmem_queued   -= skb->truesize;
7986
	sk_mem_uncharge(sk, skb->truesize);
7987

7988
	sock_wfree(skb);
7989
	sctp_wake_up_waiters(sk, asoc);
L
Linus Torvalds 已提交
7990 7991 7992 7993

	sctp_association_put(asoc);
}

7994 7995 7996 7997 7998 7999 8000 8001 8002 8003 8004
/* 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);
8005 8006

	/*
8007
	 * Mimic the behavior of sock_rfree
8008
	 */
8009
	sk_mem_uncharge(sk, event->rmem_len);
8010 8011 8012
}


L
Linus Torvalds 已提交
8013 8014
/* Helper function to wait for space in the sndbuf.  */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8015
				size_t msg_len)
L
Linus Torvalds 已提交
8016 8017 8018 8019
{
	struct sock *sk = asoc->base.sk;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);
8020
	int err = 0;
L
Linus Torvalds 已提交
8021

8022 8023
	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
		 *timeo_p, msg_len);
L
Linus Torvalds 已提交
8024 8025 8026 8027 8028 8029 8030 8031

	/* 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);
8032 8033
		if (asoc->base.dead)
			goto do_dead;
L
Linus Torvalds 已提交
8034 8035
		if (!*timeo_p)
			goto do_nonblock;
8036
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
L
Linus Torvalds 已提交
8037 8038 8039 8040 8041 8042 8043 8044 8045
			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.
		 */
8046
		release_sock(sk);
L
Linus Torvalds 已提交
8047
		current_timeo = schedule_timeout(current_timeo);
8048
		lock_sock(sk);
8049 8050
		if (sk != asoc->base.sk)
			goto do_error;
L
Linus Torvalds 已提交
8051 8052 8053 8054 8055 8056 8057 8058 8059 8060 8061 8062

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

8063 8064 8065 8066
do_dead:
	err = -ESRCH;
	goto out;

L
Linus Torvalds 已提交
8067 8068 8069 8070 8071 8072 8073 8074 8075 8076 8077 8078 8079
do_error:
	err = -EPIPE;
	goto out;

do_interrupted:
	err = sock_intr_errno(*timeo_p);
	goto out;

do_nonblock:
	err = -EAGAIN;
	goto out;
}

8080
void sctp_data_ready(struct sock *sk)
8081
{
8082 8083 8084 8085
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
H
Herbert Xu 已提交
8086
	if (skwq_has_sleeper(wq))
8087 8088
		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
						EPOLLRDNORM | EPOLLRDBAND);
8089
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8090
	rcu_read_unlock();
8091 8092
}

L
Linus Torvalds 已提交
8093 8094 8095 8096 8097 8098
/* 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.  */
8099
	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
L
Linus Torvalds 已提交
8100 8101 8102 8103 8104 8105
		__sctp_write_space(asoc);
	}
}

/* Is there any sndbuf space available on the socket?
 *
8106
 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
L
Linus Torvalds 已提交
8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117 8118
 * 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;

8119
	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
L
Linus Torvalds 已提交
8120 8121 8122 8123 8124 8125 8126 8127 8128 8129 8130 8131 8132 8133 8134
	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);

8135
	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
L
Linus Torvalds 已提交
8136 8137 8138 8139 8140 8141 8142 8143 8144 8145 8146 8147 8148 8149 8150 8151 8152 8153 8154 8155 8156 8157 8158

	/* 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.
		 */
8159
		release_sock(sk);
L
Linus Torvalds 已提交
8160
		current_timeo = schedule_timeout(current_timeo);
8161
		lock_sock(sk);
L
Linus Torvalds 已提交
8162 8163 8164 8165 8166 8167 8168 8169 8170 8171 8172 8173 8174

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

do_error:
8175
	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
L
Linus Torvalds 已提交
8176 8177 8178 8179 8180 8181 8182 8183 8184 8185 8186 8187 8188 8189 8190 8191 8192 8193 8194 8195 8196 8197 8198 8199
		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
8200
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
L
Linus Torvalds 已提交
8201 8202 8203
					  TASK_INTERRUPTIBLE);

		if (list_empty(&ep->asocs)) {
8204
			release_sock(sk);
L
Linus Torvalds 已提交
8205
			timeo = schedule_timeout(timeo);
8206
			lock_sock(sk);
L
Linus Torvalds 已提交
8207 8208 8209 8210 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225
		}

		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
8226
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8227 8228 8229 8230

	return err;
}

8231
static void sctp_wait_for_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
8232 8233 8234 8235
{
	DEFINE_WAIT(wait);

	do {
E
Eric Dumazet 已提交
8236
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
8237 8238
		if (list_empty(&sctp_sk(sk)->ep->asocs))
			break;
8239
		release_sock(sk);
L
Linus Torvalds 已提交
8240
		timeout = schedule_timeout(timeout);
8241
		lock_sock(sk);
L
Linus Torvalds 已提交
8242 8243
	} while (!signal_pending(current) && timeout);

E
Eric Dumazet 已提交
8244
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8245 8246
}

8247 8248 8249 8250 8251 8252 8253 8254
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. */
8255
	skb_walk_frags(skb, frag)
8256 8257 8258 8259 8260 8261
		sctp_skb_set_owner_r_frag(frag, sk);

done:
	sctp_skb_set_owner_r(skb, sk);
}

8262 8263 8264 8265
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
8266
	struct inet_sock *newinet;
8267 8268 8269 8270

	newsk->sk_type = sk->sk_type;
	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
	newsk->sk_flags = sk->sk_flags;
8271
	newsk->sk_tsflags = sk->sk_tsflags;
8272 8273
	newsk->sk_no_check_tx = sk->sk_no_check_tx;
	newsk->sk_no_check_rx = sk->sk_no_check_rx;
8274 8275 8276
	newsk->sk_reuse = sk->sk_reuse;

	newsk->sk_shutdown = sk->sk_shutdown;
8277
	newsk->sk_destruct = sctp_destruct_sock;
8278 8279 8280 8281 8282 8283 8284 8285
	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;
8286
	newsk->sk_rxhash = sk->sk_rxhash;
8287 8288 8289 8290 8291 8292

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
E
Eric Dumazet 已提交
8293 8294 8295 8296
	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);
8297
	newinet->pmtudisc = inet->pmtudisc;
E
Eric Dumazet 已提交
8298
	newinet->inet_id = asoc->next_tsn ^ jiffies;
8299 8300 8301 8302 8303 8304

	newinet->uc_ttl = inet->uc_ttl;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;
8305 8306 8307

	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
		net_enable_timestamp();
8308 8309

	security_sk_clone(sk, newsk);
8310 8311
}

8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324
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
8325 8326 8327 8328 8329
/* 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,
8330
			      enum sctp_socket_type type)
L
Linus Torvalds 已提交
8331 8332 8333 8334 8335 8336 8337
{
	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;
8338
	struct sctp_bind_hashbucket *head;
L
Linus Torvalds 已提交
8339 8340 8341 8342 8343 8344 8345

	/* 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. */
8346
	sctp_copy_descendant(newsk, oldsk);
L
Linus Torvalds 已提交
8347 8348 8349 8350 8351 8352 8353 8354

	/* 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. */
8355 8356
	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
						 inet_sk(oldsk)->inet_num)];
8357
	spin_lock_bh(&head->lock);
L
Linus Torvalds 已提交
8358 8359 8360
	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
8361
	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8362
	spin_unlock_bh(&head->lock);
L
Linus Torvalds 已提交
8363

8364 8365 8366
	/* Copy the bind_addr list from the original endpoint to the new
	 * endpoint so that we can handle restarts properly
	 */
8367 8368
	sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
				&oldsp->ep->base.bind_addr, GFP_KERNEL);
8369

L
Linus Torvalds 已提交
8370 8371 8372 8373 8374 8375
	/* 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
8376
			__skb_unlink(skb, &oldsk->sk_receive_queue);
L
Linus Torvalds 已提交
8377
			__skb_queue_tail(&newsk->sk_receive_queue, skb);
8378
			sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8379 8380 8381 8382 8383 8384 8385 8386 8387 8388
		}
	}

	/* 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);
8389
	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
L
Linus Torvalds 已提交
8390

8391
	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
L
Linus Torvalds 已提交
8392 8393 8394 8395 8396 8397 8398 8399 8400 8401 8402 8403 8404 8405
		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
8406
				__skb_unlink(skb, &oldsp->pd_lobby);
L
Linus Torvalds 已提交
8407
				__skb_queue_tail(queue, skb);
8408
				sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8409 8410 8411 8412 8413 8414 8415
			}
		}

		/* Clear up any skbs waiting for the partial
		 * delivery to finish.
		 */
		if (assoc->ulpq.pd_mode)
8416
			sctp_clear_pd(oldsk, NULL);
L
Linus Torvalds 已提交
8417 8418 8419

	}

8420
	sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8421

L
Linus Torvalds 已提交
8422 8423 8424 8425 8426 8427
	/* 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;

8428 8429 8430 8431 8432
	/* 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.
8433 8434 8435
	 *
	 * The caller has just allocated newsk so we can guarantee that other
	 * paths won't try to lock it and then oldsk.
8436
	 */
8437
	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8438
	sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
L
Linus Torvalds 已提交
8439
	sctp_assoc_migrate(assoc, newsk);
8440
	sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
L
Linus Torvalds 已提交
8441 8442 8443 8444

	/* If the association on the newsk is already closed before accept()
	 * is called, set RCV_SHUTDOWN flag.
	 */
8445
	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8446
		inet_sk_set_state(newsk, SCTP_SS_CLOSED);
L
Linus Torvalds 已提交
8447
		newsk->sk_shutdown |= RCV_SHUTDOWN;
8448
	} else {
8449
		inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8450
	}
L
Linus Torvalds 已提交
8451

8452
	release_sock(newsk);
L
Linus Torvalds 已提交
8453 8454
}

8455

L
Linus Torvalds 已提交
8456 8457 8458 8459 8460 8461 8462 8463 8464 8465 8466 8467 8468 8469 8470 8471 8472 8473 8474 8475 8476 8477
/* 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),
8478 8479 8480 8481
	.useroffset  =  offsetof(struct sctp_sock, subscribe),
	.usersize    =  offsetof(struct sctp_sock, initmsg) -
				offsetof(struct sctp_sock, subscribe) +
				sizeof_field(struct sctp_sock, initmsg),
8482 8483 8484 8485 8486 8487
	.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,
8488
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8489 8490
};

E
Eric Dumazet 已提交
8491
#if IS_ENABLED(CONFIG_IPV6)
8492

8493 8494 8495 8496 8497 8498 8499
#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
8500 8501 8502 8503 8504 8505 8506 8507 8508
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,
8509
	.destroy	= sctp_v6_destroy_sock,
L
Linus Torvalds 已提交
8510 8511 8512 8513 8514 8515 8516 8517 8518 8519 8520
	.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),
8521 8522 8523 8524
	.useroffset	= offsetof(struct sctp6_sock, sctp.subscribe),
	.usersize	= offsetof(struct sctp6_sock, sctp.initmsg) -
				offsetof(struct sctp6_sock, sctp.subscribe) +
				sizeof_field(struct sctp6_sock, sctp.initmsg),
8525 8526 8527 8528 8529 8530
	.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,
8531
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8532
};
E
Eric Dumazet 已提交
8533
#endif /* IS_ENABLED(CONFIG_IPV6) */