socket.c 224.4 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>

/* Forward declarations for internal helper functions. */
static int sctp_writeable(struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
				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);
static void sctp_sock_migrate(struct sock *, struct sock *,
			      struct sctp_association *, sctp_socket_type_t);

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static int 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);

	atomic_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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}

/* 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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	/* V4 mapped address are really of AF_INET family */
	if (addr->sa.sa_family == AF_INET6 &&
	    ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
		if (!opt->pf->af_supported(AF_INET, opt))
			return NULL;
	} else {
		/* Does this PF support this AF? */
		if (!opt->pf->af_supported(addr->sa.sa_family, 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.
 *
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 * If any of the addresses is already in the bind address list of the
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 * 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.
 */
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static int sctp_send_asconf_add_ip(struct sock		*sk,
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				   struct sockaddr	*addrs,
				   int 			addrcnt)
{
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	struct net *net = sock_net(sk);
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	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;
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	union sctp_addr			saveaddr;
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	void				*addr_buf;
	struct sctp_af			*af;
	struct list_head		*p;
	int 				i;
	int 				retval = 0;

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	if (!net->sctp.addip_enable)
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		return retval;

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

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	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
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	list_for_each_entry(asoc, &ep->asocs, asocs) {
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		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
543 544
		 * 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
545 546 547 548
		 * other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
549
			addr = addr_buf;
L
Linus Torvalds 已提交
550 551 552 553 554 555 556 557 558 559 560 561 562 563
			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;

564 565
		/* Use the first valid address in bind addr list of
		 * association as Address Parameter of ASCONF CHUNK.
L
Linus Torvalds 已提交
566 567 568 569
		 */
		bp = &asoc->base.bind_addr;
		p = bp->address_list.next;
		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
570
		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
L
Linus Torvalds 已提交
571 572 573 574 575 576
						   addrcnt, SCTP_PARAM_ADD_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

577 578
		/* Add the new addresses to the bind address list with
		 * use_as_src set to 0.
L
Linus Torvalds 已提交
579
		 */
580 581
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
582
			addr = addr_buf;
583 584
			af = sctp_get_af_specific(addr->v4.sin_family);
			memcpy(&saveaddr, addr, af->sockaddr_len);
585
			retval = sctp_add_bind_addr(bp, &saveaddr,
586
						    sizeof(saveaddr),
587
						    SCTP_ADDR_NEW, GFP_ATOMIC);
588 589
			addr_buf += af->sockaddr_len;
		}
590 591 592 593 594 595
		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 */
596
				sctp_transport_dst_release(trans);
597 598 599 600
				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;
601
				sctp_max_rto(asoc, trans);
602 603 604 605 606 607
				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
608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
	}

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.
 */
629
static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
L
Linus Torvalds 已提交
630 631 632 633 634 635 636
{
	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;
637
	union sctp_addr *sa_addr;
L
Linus Torvalds 已提交
638 639
	struct sctp_af *af;

640 641
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
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	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
655
		sa_addr = addr_buf;
656
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
L
Linus Torvalds 已提交
657 658 659 660
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_rem;
		}
661 662 663 664 665 666

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

667 668
		if (sa_addr->v4.sin_port &&
		    sa_addr->v4.sin_port != htons(bp->port)) {
L
Linus Torvalds 已提交
669 670 671 672
			retval = -EINVAL;
			goto err_bindx_rem;
		}

673 674 675
		if (!sa_addr->v4.sin_port)
			sa_addr->v4.sin_port = htons(bp->port);

L
Linus Torvalds 已提交
676 677 678 679 680 681 682
		/* 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
		 */
683
		retval = sctp_del_bind_addr(bp, sa_addr);
L
Linus Torvalds 已提交
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701

		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.
 *
702
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
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 * 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)
{
712
	struct net *net = sock_net(sk);
L
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	struct sctp_sock	*sp;
	struct sctp_endpoint	*ep;
	struct sctp_association	*asoc;
716
	struct sctp_transport	*transport;
L
Linus Torvalds 已提交
717 718 719 720 721
	struct sctp_bind_addr	*bp;
	struct sctp_chunk	*chunk;
	union sctp_addr		*laddr;
	void			*addr_buf;
	struct sctp_af		*af;
722
	struct sctp_sockaddr_entry *saddr;
L
Linus Torvalds 已提交
723 724
	int 			i;
	int 			retval = 0;
725
	int			stored = 0;
L
Linus Torvalds 已提交
726

727
	chunk = NULL;
728
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
729 730 731 732 733
		return retval;

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

734 735
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
736

737
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
738 739 740 741 742 743 744 745 746 747 748

		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
749
		 * not present in the bind address list of the association.
L
Linus Torvalds 已提交
750 751 752 753 754
		 * 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
755
			laddr = addr_buf;
L
Linus Torvalds 已提交
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
			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);
778 779 780 781 782
		if ((laddr == NULL) && (addrcnt == 1)) {
			if (asoc->asconf_addr_del_pending)
				continue;
			asoc->asconf_addr_del_pending =
			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
783 784 785 786
			if (asoc->asconf_addr_del_pending == NULL) {
				retval = -ENOMEM;
				goto out;
			}
787 788 789 790 791 792 793 794 795 796 797 798 799
			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
800
				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
801
			}
802 803 804 805 806

			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);

807 808 809 810
			asoc->src_out_of_asoc_ok = 1;
			stored = 1;
			goto skip_mkasconf;
		}
L
Linus Torvalds 已提交
811

812 813 814
		if (laddr == NULL)
			return -EINVAL;

815 816 817 818
		/* 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
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		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
						   SCTP_PARAM_DEL_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

826
skip_mkasconf:
827 828 829 830 831
		/* 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
832
			laddr = addr_buf;
833
			af = sctp_get_af_specific(laddr->v4.sin_family);
834
			list_for_each_entry(saddr, &bp->address_list, list) {
835
				if (sctp_cmp_addr_exact(&saddr->a, laddr))
836
					saddr->state = SCTP_ADDR_DEL;
837 838 839
			}
			addr_buf += af->sockaddr_len;
		}
L
Linus Torvalds 已提交
840

841 842 843
		/* 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
844
		 */
845 846
		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
					transports) {
847
			sctp_transport_dst_release(transport);
848 849 850 851
			sctp_transport_route(transport, NULL,
					     sctp_sk(asoc->base.sk));
		}

852 853 854
		if (stored)
			/* We don't need to transmit ASCONF */
			continue;
855
		retval = sctp_send_asconf(asoc, chunk);
L
Linus Torvalds 已提交
856 857 858 859 860
	}
out:
	return retval;
}

861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882
/* 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
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
/* 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
899
 * must be used to distinguish the address length (note that this
L
Linus Torvalds 已提交
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
 * 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
938 939
 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 * from userspace.
L
Linus Torvalds 已提交
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958
 *
 * We don't use copy_from_user() for optimization: we first do the
 * sanity checks (buffer size -fast- and access check-healthy
 * pointer); if all of those succeed, then we can alloc the memory
 * (expensive operation) needed to copy the data to kernel. Then we do
 * the copying without checking the user space area
 * (__copy_from_user()).
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 * op        Operation to perform (add or remove, see the flags of
 *           sctp_bindx)
 *
 * Returns 0 if ok, <0 errno code on error.
 */
959
static int sctp_setsockopt_bindx(struct sock *sk,
960 961
				 struct sockaddr __user *addrs,
				 int addrs_size, int op)
L
Linus Torvalds 已提交
962 963 964 965 966 967 968 969 970
{
	struct sockaddr *kaddrs;
	int err;
	int addrcnt = 0;
	int walk_size = 0;
	struct sockaddr *sa_addr;
	void *addr_buf;
	struct sctp_af *af;

971 972
	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
973 974 975 976 977 978 979 980 981

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

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

	/* Alloc space for the address array in kernel memory.  */
982
	kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
L
Linus Torvalds 已提交
983 984 985 986 987 988 989 990
	if (unlikely(!kaddrs))
		return -ENOMEM;

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

991
	/* Walk through the addrs buffer and count the number of addresses. */
L
Linus Torvalds 已提交
992 993
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
994 995 996 997 998
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			kfree(kaddrs);
			return -EINVAL;
		}

J
Joe Perches 已提交
999
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
1000 1001 1002 1003
		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.
1004
		 */
L
Linus Torvalds 已提交
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
			kfree(kaddrs);
			return -EINVAL;
		}
		addrcnt++;
		addr_buf += af->sockaddr_len;
		walk_size += af->sockaddr_len;
	}

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

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

	default:
		err = -EINVAL;
		break;
1033
	}
L
Linus Torvalds 已提交
1034 1035 1036 1037 1038 1039 1040

out:
	kfree(kaddrs);

	return err;
}

F
Frank Filz 已提交
1041 1042 1043 1044 1045
/* __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.
 */
1046
static int __sctp_connect(struct sock *sk,
F
Frank Filz 已提交
1047
			  struct sockaddr *kaddrs,
1048 1049
			  int addrs_size,
			  sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1050
{
1051
	struct net *net = sock_net(sk);
F
Frank Filz 已提交
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
	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;
	sctp_scope_t scope;
	long timeo;
	int err = 0;
	int addrcnt = 0;
	int walk_size = 0;
1063
	union sctp_addr *sa_addr = NULL;
F
Frank Filz 已提交
1064
	void *addr_buf;
1065
	unsigned short port;
1066
	unsigned int f_flags = 0;
F
Frank Filz 已提交
1067 1068 1069 1070 1071 1072 1073 1074 1075

	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.
	 */
1076
	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
F
Frank Filz 已提交
1077 1078 1079 1080 1081 1082 1083 1084
	    (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) {
1085 1086
		struct sctp_af *af;

1087 1088 1089 1090 1091
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

J
Joe Perches 已提交
1092
		sa_addr = addr_buf;
1093
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
F
Frank Filz 已提交
1094 1095 1096 1097 1098 1099 1100 1101 1102

		/* 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;
		}

1103 1104
		port = ntohs(sa_addr->v4.sin_port);

1105 1106 1107 1108
		/* 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
1109 1110 1111
		if (err)
			goto out_free;

1112 1113 1114
		/* Make sure the destination port is correctly set
		 * in all addresses.
		 */
1115 1116
		if (asoc && asoc->peer.port && asoc->peer.port != port) {
			err = -EINVAL;
1117
			goto out_free;
1118
		}
F
Frank Filz 已提交
1119 1120 1121 1122

		/* Check if there already is a matching association on the
		 * endpoint (other than the one created here).
		 */
1123
		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
F
Frank Filz 已提交
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
		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.
		 */
1136
		if (sctp_endpoint_is_peeled_off(ep, &to)) {
F
Frank Filz 已提交
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
			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;
				}
1152 1153
			} else {
				/*
1154 1155 1156 1157
				 * 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
1158 1159
				 * be permitted to open new associations.
				 */
1160 1161 1162 1163
				if (ep->base.bind_addr.port <
				    inet_prot_sock(net) &&
				    !ns_capable(net->user_ns,
				    CAP_NET_BIND_SERVICE)) {
1164 1165 1166
					err = -EACCES;
					goto out_free;
				}
F
Frank Filz 已提交
1167 1168
			}

1169
			scope = sctp_scope(&to);
F
Frank Filz 已提交
1170 1171 1172 1173 1174
			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
			if (!asoc) {
				err = -ENOMEM;
				goto out_free;
			}
1175 1176 1177 1178 1179 1180 1181

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

F
Frank Filz 已提交
1182 1183 1184
		}

		/* Prime the peer's transport structures.  */
1185
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
F
Frank Filz 已提交
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}

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

1197 1198 1199 1200 1201 1202 1203 1204 1205
	/* 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;
	}

1206
	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
F
Frank Filz 已提交
1207 1208 1209 1210 1211
	if (err < 0) {
		goto out_free;
	}

	/* Initialize sk's dport and daddr for getpeername() */
E
Eric Dumazet 已提交
1212
	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1213
	sp->pf->to_sk_daddr(sa_addr, sk);
1214
	sk->sk_err = 0;
F
Frank Filz 已提交
1215

1216 1217 1218 1219 1220 1221 1222 1223
	/* 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);

1224
	if (assoc_id)
1225
		*assoc_id = asoc->assoc_id;
1226 1227 1228 1229
	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
1230 1231 1232 1233 1234

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

out_free:
1235 1236
	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
1237

1238 1239 1240 1241 1242
	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
1243
		sctp_association_free(asoc);
1244
	}
F
Frank Filz 已提交
1245 1246 1247 1248 1249 1250
	return err;
}

/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
 *
 * API 8.9
1251 1252
 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
 * 			sctp_assoc_t *asoc);
F
Frank Filz 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
 *
 * 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.
 *
1268 1269 1270 1271
 * 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
1272 1273 1274 1275 1276 1277 1278 1279
 *
 * 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
1280
 * the association is implementation dependent.  This function only
F
Frank Filz 已提交
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
 * specifies that the stack will try to make use of all the addresses in
 * the list when needed.
 *
 * Note that the list of addresses passed in is only used for setting up
 * the association.  It does not necessarily equal the set of addresses
 * the peer uses for the resulting association.  If the caller wants to
 * find out the set of peer addresses, it must use sctp_getpaddrs() to
 * retrieve them after the association has been set up.
 *
 * Basically do nothing but copying the addresses from user to kernel
 * land and invoking either sctp_connectx(). This is used for tunneling
 * the sctp_connectx() request through sctp_setsockopt() from userspace.
 *
 * We don't use copy_from_user() for optimization: we first do the
 * sanity checks (buffer size -fast- and access check-healthy
 * pointer); if all of those succeed, then we can alloc the memory
 * (expensive operation) needed to copy the data to kernel. Then we do
 * the copying without checking the user space area
 * (__copy_from_user()).
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 *
1308
 * Returns >=0 if ok, <0 errno code on error.
F
Frank Filz 已提交
1309
 */
1310
static int __sctp_setsockopt_connectx(struct sock *sk,
F
Frank Filz 已提交
1311
				      struct sockaddr __user *addrs,
1312 1313
				      int addrs_size,
				      sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1314 1315
{
	struct sockaddr *kaddrs;
1316 1317
	gfp_t gfp = GFP_KERNEL;
	int err = 0;
F
Frank Filz 已提交
1318

1319 1320
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
		 __func__, sk, addrs, addrs_size);
F
Frank Filz 已提交
1321 1322 1323 1324 1325 1326 1327 1328 1329

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

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

	/* Alloc space for the address array in kernel memory.  */
1330 1331 1332
	if (sk->sk_socket->file)
		gfp = GFP_USER | __GFP_NOWARN;
	kaddrs = kmalloc(addrs_size, gfp);
F
Frank Filz 已提交
1333 1334 1335 1336 1337 1338
	if (unlikely(!kaddrs))
		return -ENOMEM;

	if (__copy_from_user(kaddrs, addrs, addrs_size)) {
		err = -EFAULT;
	} else {
1339
		err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
F
Frank Filz 已提交
1340 1341 1342
	}

	kfree(kaddrs);
1343

F
Frank Filz 已提交
1344 1345 1346
	return err;
}

1347 1348 1349 1350
/*
 * This is an older interface.  It's kept for backward compatibility
 * to the option that doesn't provide association id.
 */
1351
static int sctp_setsockopt_connectx_old(struct sock *sk,
1352 1353
					struct sockaddr __user *addrs,
					int addrs_size)
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
{
	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.
 */
1364
static int sctp_setsockopt_connectx(struct sock *sk,
1365 1366
				    struct sockaddr __user *addrs,
				    int addrs_size)
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
{
	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;
}

1379
/*
1380 1381
 * New (hopefully final) interface for the API.
 * We use the sctp_getaddrs_old structure so that use-space library
1382
 * can avoid any unnecessary allocations. The only different part
1383
 * is that we store the actual length of the address buffer into the
1384
 * addrs_num structure member. That way we can re-use the existing
1385
 * code.
1386
 */
1387 1388 1389 1390 1391 1392 1393 1394
#ifdef CONFIG_COMPAT
struct compat_sctp_getaddrs_old {
	sctp_assoc_t	assoc_id;
	s32		addr_num;
	compat_uptr_t	addrs;		/* struct sockaddr * */
};
#endif

1395
static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1396 1397
				     char __user *optval,
				     int __user *optlen)
1398
{
1399
	struct sctp_getaddrs_old param;
1400 1401 1402
	sctp_assoc_t assoc_id = 0;
	int err = 0;

1403
#ifdef CONFIG_COMPAT
1404
	if (in_compat_syscall()) {
1405
		struct compat_sctp_getaddrs_old param32;
1406

1407 1408 1409 1410
		if (len < sizeof(param32))
			return -EINVAL;
		if (copy_from_user(&param32, optval, sizeof(param32)))
			return -EFAULT;
1411

1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
		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;
	}
1423

1424 1425 1426
	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
					 param.addrs, param.addr_num,
					 &assoc_id);
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	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
1437 1438 1439 1440 1441 1442 1443 1444 1445 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
/* 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.
 */
1487
static void sctp_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
1488
{
1489
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1490 1491 1492
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;
	struct list_head *pos, *temp;
1493
	unsigned int data_was_unread;
L
Linus Torvalds 已提交
1494

1495
	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
L
Linus Torvalds 已提交
1496

1497
	lock_sock(sk);
L
Linus Torvalds 已提交
1498
	sk->sk_shutdown = SHUTDOWN_MASK;
1499
	sk->sk_state = SCTP_SS_CLOSING;
L
Linus Torvalds 已提交
1500 1501 1502

	ep = sctp_sk(sk)->ep;

1503 1504 1505 1506
	/* 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);

1507
	/* Walk all associations on an endpoint.  */
L
Linus Torvalds 已提交
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
	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);
1519 1520 1521
				continue;
			}
		}
L
Linus Torvalds 已提交
1522

1523 1524 1525
		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
		    !skb_queue_empty(&asoc->ulpq.reasm) ||
		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1526 1527 1528
			struct sctp_chunk *chunk;

			chunk = sctp_make_abort_user(asoc, NULL, 0);
1529
			sctp_primitive_ABORT(net, asoc, chunk);
1530
		} else
1531
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1532 1533 1534 1535 1536 1537 1538
	}

	/* 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.  */
1539
	release_sock(sk);
L
Linus Torvalds 已提交
1540 1541 1542

	/* Supposedly, no process has access to the socket, but
	 * the net layers still may.
1543 1544
	 * 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
1545
	 */
1546
	spin_lock_bh(&net->sctp.addr_wq_lock);
1547
	bh_lock_sock(sk);
L
Linus Torvalds 已提交
1548 1549 1550 1551 1552 1553 1554

	/* 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);

1555
	bh_unlock_sock(sk);
1556
	spin_unlock_bh(&net->sctp.addr_wq_lock);
L
Linus Torvalds 已提交
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 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

	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(). */

1596
static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
L
Linus Torvalds 已提交
1597

1598
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
L
Linus Torvalds 已提交
1599
{
1600
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1601 1602
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
1603
	struct sctp_association *new_asoc = NULL, *asoc = NULL;
L
Linus Torvalds 已提交
1604 1605
	struct sctp_transport *transport, *chunk_tp;
	struct sctp_chunk *chunk;
1606
	union sctp_addr to;
L
Linus Torvalds 已提交
1607
	struct sockaddr *msg_name = NULL;
1608
	struct sctp_sndrcvinfo default_sinfo;
L
Linus Torvalds 已提交
1609 1610 1611 1612 1613
	struct sctp_sndrcvinfo *sinfo;
	struct sctp_initmsg *sinit;
	sctp_assoc_t associd = 0;
	sctp_cmsgs_t cmsgs = { NULL };
	sctp_scope_t scope;
1614
	bool fill_sinfo_ttl = false, wait_connect = false;
L
Linus Torvalds 已提交
1615 1616
	struct sctp_datamsg *datamsg;
	int msg_flags = msg->msg_flags;
1617 1618 1619
	__u16 sinfo_flags = 0;
	long timeo;
	int err;
L
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1620 1621 1622 1623 1624

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

1625 1626
	pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
		 msg, msg_len, ep);
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Linus Torvalds 已提交
1627 1628 1629 1630 1631 1632 1633 1634 1635 1636

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

	/* Parse out the SCTP CMSGs.  */
	err = sctp_msghdr_parse(msg, &cmsgs);
	if (err) {
1637
		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
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Linus Torvalds 已提交
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660
		goto out_nounlock;
	}

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

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

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

	sinit = cmsgs.init;
1661 1662 1663 1664 1665 1666 1667
	if (cmsgs.sinfo != NULL) {
		memset(&default_sinfo, 0, sizeof(default_sinfo));
		default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
		default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
		default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
		default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
		default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
L
Linus Torvalds 已提交
1668

1669 1670 1671 1672 1673 1674
		sinfo = &default_sinfo;
		fill_sinfo_ttl = true;
	} else {
		sinfo = cmsgs.srinfo;
	}
	/* Did the user specify SNDINFO/SNDRCVINFO? */
L
Linus Torvalds 已提交
1675 1676 1677 1678 1679
	if (sinfo) {
		sinfo_flags = sinfo->sinfo_flags;
		associd = sinfo->sinfo_assoc_id;
	}

1680 1681
	pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
		 msg_len, sinfo_flags);
L
Linus Torvalds 已提交
1682

1683 1684
	/* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
	if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
L
Linus Torvalds 已提交
1685 1686 1687 1688
		err = -EINVAL;
		goto out_nounlock;
	}

1689 1690 1691
	/* If SCTP_EOF is set, no data can be sent. Disallow sending zero
	 * length messages when SCTP_EOF|SCTP_ABORT is not set.
	 * If SCTP_ABORT is set, the message length could be non zero with
L
Linus Torvalds 已提交
1692
	 * the msg_iov set to the user abort reason.
1693
	 */
1694 1695
	if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
	    (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
L
Linus Torvalds 已提交
1696 1697 1698 1699
		err = -EINVAL;
		goto out_nounlock;
	}

1700
	/* If SCTP_ADDR_OVER is set, there must be an address
L
Linus Torvalds 已提交
1701 1702
	 * specified in msg_name.
	 */
1703
	if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708 1709
		err = -EINVAL;
		goto out_nounlock;
	}

	transport = NULL;

1710
	pr_debug("%s: about to look up association\n", __func__);
L
Linus Torvalds 已提交
1711

1712
	lock_sock(sk);
L
Linus Torvalds 已提交
1713 1714 1715 1716

	/* If a msg_name has been specified, assume this is to be used.  */
	if (msg_name) {
		/* Look for a matching association on the endpoint. */
1717
		asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730

		/* If we could not find a matching association on the
		 * endpoint, make sure that it is not a TCP-style
		 * socket that already has an association or there is
		 * no peeled-off association on another socket.
		 */
		if (!asoc &&
		    ((sctp_style(sk, TCP) &&
		      (sctp_sstate(sk, ESTABLISHED) ||
		       sctp_sstate(sk, CLOSING))) ||
		     sctp_endpoint_is_peeled_off(ep, &to))) {
			err = -EADDRNOTAVAIL;
			goto out_unlock;
L
Linus Torvalds 已提交
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
		}
	} else {
		asoc = sctp_id2assoc(sk, associd);
		if (!asoc) {
			err = -EPIPE;
			goto out_unlock;
		}
	}

	if (asoc) {
1741
		pr_debug("%s: just looked up association:%p\n", __func__, asoc);
L
Linus Torvalds 已提交
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752

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

1753
		if (sinfo_flags & SCTP_EOF) {
1754 1755 1756
			pr_debug("%s: shutting down association:%p\n",
				 __func__, asoc);

1757
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1758 1759 1760
			err = 0;
			goto out_unlock;
		}
1761
		if (sinfo_flags & SCTP_ABORT) {
1762 1763 1764 1765 1766 1767 1768

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

1769 1770 1771
			pr_debug("%s: aborting association:%p\n",
				 __func__, asoc);

1772
			sctp_primitive_ABORT(net, asoc, chunk);
L
Linus Torvalds 已提交
1773 1774 1775 1776 1777 1778 1779
			err = 0;
			goto out_unlock;
		}
	}

	/* Do we need to create the association?  */
	if (!asoc) {
1780
		pr_debug("%s: there is no association yet\n", __func__);
L
Linus Torvalds 已提交
1781

1782
		if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
L
Linus Torvalds 已提交
1783 1784 1785 1786 1787 1788 1789 1790
			err = -EINVAL;
			goto out_unlock;
		}

		/* Check for invalid stream against the stream counts,
		 * either the default or the user specified stream counts.
		 */
		if (sinfo) {
1791
			if (!sinit || !sinit->sinit_num_ostreams) {
L
Linus Torvalds 已提交
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
				/* Check against the defaults. */
				if (sinfo->sinfo_stream >=
				    sp->initmsg.sinit_num_ostreams) {
					err = -EINVAL;
					goto out_unlock;
				}
			} else {
				/* Check against the requested.  */
				if (sinfo->sinfo_stream >=
				    sinit->sinit_num_ostreams) {
					err = -EINVAL;
					goto out_unlock;
				}
			}
		}

		/*
		 * API 3.1.2 bind() - UDP Style Syntax
		 * If a bind() or sctp_bindx() is not called prior to a
		 * sendmsg() call that initiates a new association, the
		 * system picks an ephemeral port and will choose an address
		 * set equivalent to binding with a wildcard address.
		 */
		if (!ep->base.bind_addr.port) {
			if (sctp_autobind(sk)) {
				err = -EAGAIN;
				goto out_unlock;
			}
1820 1821 1822 1823 1824 1825 1826 1827
		} else {
			/*
			 * If an unprivileged user inherits a one-to-many
			 * style socket with open associations on a privileged
			 * port, it MAY be permitted to accept new associations,
			 * but it SHOULD NOT be permitted to open new
			 * associations.
			 */
1828
			if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1829
			    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1830 1831 1832
				err = -EACCES;
				goto out_unlock;
			}
L
Linus Torvalds 已提交
1833 1834 1835 1836 1837 1838 1839 1840 1841
		}

		scope = sctp_scope(&to);
		new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
		if (!new_asoc) {
			err = -ENOMEM;
			goto out_unlock;
		}
		asoc = new_asoc;
1842 1843 1844 1845 1846
		err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
		if (err < 0) {
			err = -ENOMEM;
			goto out_free;
		}
L
Linus Torvalds 已提交
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864

		/* If the SCTP_INIT ancillary data is specified, set all
		 * the association init values accordingly.
		 */
		if (sinit) {
			if (sinit->sinit_num_ostreams) {
				asoc->c.sinit_num_ostreams =
					sinit->sinit_num_ostreams;
			}
			if (sinit->sinit_max_instreams) {
				asoc->c.sinit_max_instreams =
					sinit->sinit_max_instreams;
			}
			if (sinit->sinit_max_attempts) {
				asoc->max_init_attempts
					= sinit->sinit_max_attempts;
			}
			if (sinit->sinit_max_init_timeo) {
1865
				asoc->max_init_timeo =
L
Linus Torvalds 已提交
1866 1867 1868 1869 1870
				 msecs_to_jiffies(sinit->sinit_max_init_timeo);
			}
		}

		/* Prime the peer's transport structures.  */
1871
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
L
Linus Torvalds 已提交
1872 1873 1874 1875 1876 1877 1878
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}
	}

	/* ASSERT: we have a valid association at this point.  */
1879
	pr_debug("%s: we have a valid association\n", __func__);
L
Linus Torvalds 已提交
1880 1881

	if (!sinfo) {
1882 1883
		/* If the user didn't specify SNDINFO/SNDRCVINFO, make up
		 * one with some defaults.
L
Linus Torvalds 已提交
1884
		 */
1885
		memset(&default_sinfo, 0, sizeof(default_sinfo));
L
Linus Torvalds 已提交
1886 1887 1888 1889 1890 1891
		default_sinfo.sinfo_stream = asoc->default_stream;
		default_sinfo.sinfo_flags = asoc->default_flags;
		default_sinfo.sinfo_ppid = asoc->default_ppid;
		default_sinfo.sinfo_context = asoc->default_context;
		default_sinfo.sinfo_timetolive = asoc->default_timetolive;
		default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1892

L
Linus Torvalds 已提交
1893
		sinfo = &default_sinfo;
1894 1895 1896 1897 1898
	} else if (fill_sinfo_ttl) {
		/* In case SNDINFO was specified, we still need to fill
		 * it with a default ttl from the assoc here.
		 */
		sinfo->sinfo_timetolive = asoc->default_timetolive;
L
Linus Torvalds 已提交
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
	}

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

1909
	if (asoc->pmtu_pending)
1910
		sctp_assoc_pending_pmtu(sk, asoc);
1911

L
Linus Torvalds 已提交
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
	/* If fragmentation is disabled and the message length exceeds the
	 * association fragmentation point, return EMSGSIZE.  The I-D
	 * does not specify what this error is, but this looks like
	 * a great fit.
	 */
	if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
		err = -EMSGSIZE;
		goto out_free;
	}

1922 1923 1924 1925
	/* Check for invalid stream. */
	if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
		err = -EINVAL;
		goto out_free;
L
Linus Torvalds 已提交
1926 1927
	}

X
Xin Long 已提交
1928 1929 1930
	if (sctp_wspace(asoc) < msg_len)
		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));

L
Linus Torvalds 已提交
1931 1932 1933 1934 1935 1936 1937 1938 1939
	timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
	if (!sctp_wspace(asoc)) {
		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
		if (err)
			goto out_free;
	}

	/* If an address is passed with the sendto/sendmsg call, it is used
	 * to override the primary destination address in the TCP model, or
1940
	 * when SCTP_ADDR_OVER flag is set in the UDP model.
L
Linus Torvalds 已提交
1941 1942
	 */
	if ((sctp_style(sk, TCP) && msg_name) ||
1943
	    (sinfo_flags & SCTP_ADDR_OVER)) {
1944
		chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
L
Linus Torvalds 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953
		if (!chunk_tp) {
			err = -EINVAL;
			goto out_free;
		}
	} else
		chunk_tp = NULL;

	/* Auto-connect, if we aren't connected already. */
	if (sctp_state(asoc, CLOSED)) {
1954
		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
L
Linus Torvalds 已提交
1955 1956
		if (err < 0)
			goto out_free;
1957

1958
		wait_connect = true;
1959
		pr_debug("%s: we associated primitively\n", __func__);
L
Linus Torvalds 已提交
1960 1961 1962
	}

	/* Break the message into multiple chunks of maximum size. */
A
Al Viro 已提交
1963
	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1964 1965
	if (IS_ERR(datamsg)) {
		err = PTR_ERR(datamsg);
L
Linus Torvalds 已提交
1966 1967
		goto out_free;
	}
X
Xin Long 已提交
1968
	datamsg->force_delay = !!(msg->msg_flags & MSG_MORE);
L
Linus Torvalds 已提交
1969 1970

	/* Now send the (possibly) fragmented message. */
1971
	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1972 1973
		sctp_chunk_hold(chunk);

L
Linus Torvalds 已提交
1974 1975 1976 1977 1978 1979
		/* Do accounting for the write space.  */
		sctp_set_owner_w(chunk);

		chunk->transport = chunk_tp;
	}

1980 1981 1982 1983 1984
	/* Send it to the lower layers.  Note:  all chunks
	 * must either fail or succeed.   The lower layer
	 * works that way today.  Keep it that way or this
	 * breaks.
	 */
1985
	err = sctp_primitive_SEND(net, asoc, datamsg);
1986
	/* Did the lower layer accept the chunk? */
1987 1988
	if (err) {
		sctp_datamsg_free(datamsg);
1989
		goto out_free;
1990
	}
1991

1992
	pr_debug("%s: we sent primitively\n", __func__);
1993

1994
	sctp_datamsg_put(datamsg);
1995
	err = msg_len;
L
Linus Torvalds 已提交
1996

1997 1998 1999 2000 2001
	if (unlikely(wait_connect)) {
		timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
		sctp_wait_for_connect(asoc, &timeo);
	}

L
Linus Torvalds 已提交
2002 2003 2004 2005 2006 2007
	/* If we are already past ASSOCIATE, the lower
	 * layers are responsible for association cleanup.
	 */
	goto out_unlock;

out_free:
2008
	if (new_asoc)
L
Linus Torvalds 已提交
2009 2010
		sctp_association_free(asoc);
out_unlock:
2011
	release_sock(sk);
L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050

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

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

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

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

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

2051
	skb_walk_frags(skb, list) {
L
Linus Torvalds 已提交
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079
		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.
 */
2080 2081
static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
			int noblock, int flags, int *addr_len)
L
Linus Torvalds 已提交
2082 2083 2084
{
	struct sctp_ulpevent *event = NULL;
	struct sctp_sock *sp = sctp_sk(sk);
2085
	struct sk_buff *skb, *head_skb;
L
Linus Torvalds 已提交
2086 2087 2088 2089
	int copied;
	int err = 0;
	int skb_len;

2090 2091 2092
	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
		 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
		 addr_len);
L
Linus Torvalds 已提交
2093

2094
	lock_sock(sk);
L
Linus Torvalds 已提交
2095

2096
	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2097
	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
L
Linus Torvalds 已提交
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
		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;

2115
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
Linus Torvalds 已提交
2116 2117 2118 2119 2120 2121

	event = sctp_skb2event(skb);

	if (err)
		goto out_free;

2122 2123 2124 2125 2126
	if (event->chunk && event->chunk->head_skb)
		head_skb = event->chunk->head_skb;
	else
		head_skb = skb;
	sock_recv_ts_and_drops(msg, sk, head_skb);
L
Linus Torvalds 已提交
2127 2128 2129 2130
	if (sctp_ulpevent_is_notification(event)) {
		msg->msg_flags |= MSG_NOTIFICATION;
		sp->pf->event_msgname(event, msg->msg_name, addr_len);
	} else {
2131
		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
L
Linus Torvalds 已提交
2132 2133
	}

2134 2135 2136
	/* Check if we allow SCTP_NXTINFO. */
	if (sp->recvnxtinfo)
		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2137 2138 2139
	/* Check if we allow SCTP_RCVINFO. */
	if (sp->recvrcvinfo)
		sctp_ulpevent_read_rcvinfo(event, msg);
L
Linus Torvalds 已提交
2140 2141 2142
	/* Check if we allow SCTP_SNDRCVINFO. */
	if (sp->subscribe.sctp_data_io_event)
		sctp_ulpevent_read_sndrcvinfo(event, msg);
2143

L
Linus Torvalds 已提交
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
	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);

2157 2158 2159 2160 2161 2162
		/* When only partial message is copied to the user, increase
		 * rwnd by that amount. If all the data in the skb is read,
		 * rwnd is updated when the event is freed.
		 */
		if (!sctp_ulpevent_is_notification(event))
			sctp_assoc_rwnd_increase(event->asoc, copied);
L
Linus Torvalds 已提交
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183
		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:
2184
	release_sock(sk);
L
Linus Torvalds 已提交
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
	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,
2196 2197
					     char __user *optval,
					     unsigned int optlen)
L
Linus Torvalds 已提交
2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212
{
	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,
2213
				  unsigned int optlen)
L
Linus Torvalds 已提交
2214
{
2215 2216 2217
	struct sctp_association *asoc;
	struct sctp_ulpevent *event;

2218
	if (optlen > sizeof(struct sctp_event_subscribe))
L
Linus Torvalds 已提交
2219 2220 2221
		return -EINVAL;
	if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
		return -EFAULT;
2222

2223
	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	 * 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,
					GFP_ATOMIC);
			if (!event)
				return -ENOMEM;

			sctp_ulpq_tail_event(&asoc->ulpq, event);
		}
	}

L
Linus Torvalds 已提交
2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
	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,
2256
				     unsigned int optlen)
L
Linus Torvalds 已提交
2257 2258
{
	struct sctp_sock *sp = sctp_sk(sk);
2259
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2260 2261 2262 2263 2264 2265 2266 2267 2268

	/* 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;

2269 2270 2271
	if (sp->autoclose > net->sctp.max_autoclose)
		sp->autoclose = net->sctp.max_autoclose;

L
Linus Torvalds 已提交
2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284
	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 {
2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
 *     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
2297 2298
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2299 2300 2301
 *                     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
2302 2303
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
2304 2305 2306 2307 2308 2309 2310 2311 2312 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 2338 2339 2340 2341
 *                     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.
 *
2342 2343 2344 2345
 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
 *                     heartbeat delayis to be set to the value of 0
 *                     milliseconds.
 *
2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370
 *                     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
2371
 */
A
Adrian Bunk 已提交
2372 2373 2374 2375 2376 2377 2378
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)
2379 2380 2381 2382
{
	int error;

	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2383 2384 2385
		struct net *net = sock_net(trans->asoc->base.sk);

		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2386 2387 2388 2389
		if (error)
			return error;
	}

2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
	/* 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;
			}
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
		}
	}

	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;
		}
	}

2430 2431 2432 2433 2434 2435
	/* 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) {
2436 2437
		if (trans) {
			trans->pathmtu = params->spp_pathmtu;
2438
			sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
		} 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) {
2453
				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2454
				sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
			}
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
		}
	}

2465 2466 2467 2468 2469
	/* 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) {
2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
		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;
		}
	}

2497 2498
	/* Note that a value of zero indicates the current setting should be
	   left unchanged.
2499
	 */
2500
	if (params->spp_pathmaxrxt) {
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512
		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
2513
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2514 2515
					    char __user *optval,
					    unsigned int optlen)
L
Linus Torvalds 已提交
2516
{
2517 2518 2519 2520
	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
2521
	int error;
2522
	int hb_change, pmtud_change, sackdelay_change;
L
Linus Torvalds 已提交
2523 2524

	if (optlen != sizeof(struct sctp_paddrparams))
2525
		return -EINVAL;
2526

L
Linus Torvalds 已提交
2527 2528 2529
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

2530 2531 2532 2533 2534 2535 2536 2537 2538
	/* 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 ||
2539 2540
	    (params.spp_pathmtu &&
	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2541
		return -EINVAL;
L
Linus Torvalds 已提交
2542

2543 2544 2545
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
	 */
2546
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2547 2548 2549
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans)
L
Linus Torvalds 已提交
2550 2551 2552
			return -EINVAL;
	}

2553 2554 2555 2556 2557 2558
	/* 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
2559 2560
		return -EINVAL;

2561 2562
	/* Heartbeat demand can only be sent on a transport or
	 * association, but not a socket.
L
Linus Torvalds 已提交
2563
	 */
2564 2565 2566 2567 2568 2569 2570
	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
2571

2572 2573 2574 2575 2576
	if (error)
		return error;

	/* If changes are for association, also apply parameters to each
	 * transport.
L
Linus Torvalds 已提交
2577
	 */
2578
	if (!trans && asoc) {
2579 2580
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2581 2582 2583 2584 2585
			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
						    hb_change, pmtud_change,
						    sackdelay_change);
		}
	}
L
Linus Torvalds 已提交
2586 2587 2588 2589

	return 0;
}

2590 2591 2592 2593 2594 2595 2596 2597 2598 2599
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;
}

2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633
/*
 * 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.
2634 2635
 */

2636
static int sctp_setsockopt_delayed_ack(struct sock *sk,
2637
				       char __user *optval, unsigned int optlen)
2638
{
2639
	struct sctp_sack_info    params;
2640 2641 2642 2643
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

2644 2645 2646
	if (optlen == sizeof(struct sctp_sack_info)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
2647

2648 2649 2650
		if (params.sack_delay == 0 && params.sack_freq == 0)
			return 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2651
		pr_warn_ratelimited(DEPRECATED
2652
				    "%s (pid %d) "
2653
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2654 2655
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
2656 2657 2658 2659 2660 2661 2662 2663
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;

		if (params.sack_delay == 0)
			params.sack_freq = 1;
		else
			params.sack_freq = 0;
	} else
2664
		return -EINVAL;
2665 2666

	/* Validate value parameter. */
2667
	if (params.sack_delay > 500)
2668 2669
		return -EINVAL;

2670
	/* Get association, if sack_assoc_id != 0 and the socket is a one
2671 2672
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
2673
	 */
2674 2675
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2676 2677
		return -EINVAL;

2678
	if (params.sack_delay) {
2679 2680
		if (asoc) {
			asoc->sackdelay =
2681
				msecs_to_jiffies(params.sack_delay);
2682
			asoc->param_flags =
2683
				sctp_spp_sackdelay_enable(asoc->param_flags);
2684
		} else {
2685
			sp->sackdelay = params.sack_delay;
2686
			sp->param_flags =
2687
				sctp_spp_sackdelay_enable(sp->param_flags);
2688
		}
2689 2690 2691
	}

	if (params.sack_freq == 1) {
2692
		if (asoc) {
2693
			asoc->param_flags =
2694
				sctp_spp_sackdelay_disable(asoc->param_flags);
2695
		} else {
2696
			sp->param_flags =
2697
				sctp_spp_sackdelay_disable(sp->param_flags);
2698
		}
2699 2700 2701 2702
	} else if (params.sack_freq > 1) {
		if (asoc) {
			asoc->sackfreq = params.sack_freq;
			asoc->param_flags =
2703
				sctp_spp_sackdelay_enable(asoc->param_flags);
2704 2705 2706
		} else {
			sp->sackfreq = params.sack_freq;
			sp->param_flags =
2707
				sctp_spp_sackdelay_enable(sp->param_flags);
2708
		}
2709 2710 2711 2712
	}

	/* If change is for association, also apply to each transport. */
	if (asoc) {
2713 2714
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2715
			if (params.sack_delay) {
2716
				trans->sackdelay =
2717
					msecs_to_jiffies(params.sack_delay);
2718
				trans->param_flags =
2719
					sctp_spp_sackdelay_enable(trans->param_flags);
2720
			}
2721
			if (params.sack_freq == 1) {
2722
				trans->param_flags =
2723
					sctp_spp_sackdelay_disable(trans->param_flags);
2724 2725 2726
			} else if (params.sack_freq > 1) {
				trans->sackfreq = params.sack_freq;
				trans->param_flags =
2727
					sctp_spp_sackdelay_enable(trans->param_flags);
2728 2729 2730
			}
		}
	}
2731

2732 2733 2734
	return 0;
}

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/* 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.
 */
2746
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)
2757
		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
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	if (sinit.sinit_max_instreams)
2759
		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
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	if (sinit.sinit_max_attempts)
2761
		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
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	if (sinit.sinit_max_init_timeo)
2763
		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,
2783 2784
					      char __user *optval,
					      unsigned int optlen)
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{
	struct sctp_sock *sp = sctp_sk(sk);
2787 2788
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
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2789

2790
	if (optlen != sizeof(info))
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		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
2794 2795 2796 2797
	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;
}

2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
/* 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,
2864
					unsigned int optlen)
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2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892
{
	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,
2893
				   unsigned int optlen)
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2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917
{
	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.
 *
 */
2918 2919
static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
{
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2920 2921
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;
2922 2923
	unsigned long rto_min, rto_max;
	struct sctp_sock *sp = sctp_sk(sk);
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2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936

	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;

2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952
	rto_max = rtoinfo.srto_max;
	rto_min = rtoinfo.srto_min;

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

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

	if (rto_min > rto_max)
		return -EINVAL;

L
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2953 2954
	if (asoc) {
		if (rtoinfo.srto_initial != 0)
2955
			asoc->rto_initial =
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2956
				msecs_to_jiffies(rtoinfo.srto_initial);
2957 2958
		asoc->rto_max = rto_max;
		asoc->rto_min = rto_min;
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2959 2960 2961 2962 2963 2964
	} 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;
2965 2966
		sp->rtoinfo.srto_max = rto_max;
		sp->rtoinfo.srto_min = rto_min;
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2967 2968 2969 2970 2971 2972 2973 2974 2975
	}

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
2976
 * This option is used to tune the maximum retransmission attempts
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2977 2978 2979 2980 2981 2982
 * 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.
 *
 */
2983
static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
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2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000
{

	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) {
3001 3002 3003 3004 3005
		if (assocparams.sasoc_asocmaxrxt != 0) {
			__u32 path_sum = 0;
			int   paths = 0;
			struct sctp_transport *peer_addr;

3006 3007
			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
					transports) {
3008 3009 3010 3011
				path_sum += peer_addr->pathmaxrxt;
				paths++;
			}

3012
			/* Only validate asocmaxrxt if we have more than
3013 3014 3015 3016 3017 3018 3019 3020
			 * 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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3021
			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3022 3023
		}

3024 3025
		if (assocparams.sasoc_cookie_life != 0)
			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
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3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
	} 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.
 */
3050
static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
L
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3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067
{
	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;
}

/*
3068 3069 3070
 * 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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3071 3072 3073
 * 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
3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
 * 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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3093
 */
3094
static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
L
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3095
{
3096
	struct sctp_assoc_value params;
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3097 3098 3099 3100
	struct sctp_association *asoc;
	struct sctp_sock *sp = sctp_sk(sk);
	int val;

3101
	if (optlen == sizeof(int)) {
3102
		pr_warn_ratelimited(DEPRECATED
3103
				    "%s (pid %d) "
3104
				    "Use of int in maxseg socket option.\n"
3105 3106
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3107 3108 3109 3110 3111 3112 3113 3114
		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;
	} else
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3115
		return -EINVAL;
3116

3117
	if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
L
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3118 3119
		return -EINVAL;

3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130
	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc && params.assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc) {
		if (val == 0) {
			val = asoc->pathmtu;
			val -= sp->pf->af->net_header_len;
			val -= sizeof(struct sctphdr) +
					sizeof(struct sctp_data_chunk);
		}
3131 3132
		asoc->user_frag = val;
		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3133 3134
	} else {
		sp->user_frag = val;
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	}

	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,
3150
					     unsigned int optlen)
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3151
{
3152
	struct net *net = sock_net(sk);
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3153 3154 3155 3156
	struct sctp_sock	*sp;
	struct sctp_association	*asoc = NULL;
	struct sctp_setpeerprim	prim;
	struct sctp_chunk	*chunk;
3157
	struct sctp_af		*af;
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3158 3159 3160 3161
	int 			err;

	sp = sctp_sk(sk);

3162
	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);
3172
	if (!asoc)
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		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;

3184 3185 3186 3187 3188 3189 3190
	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);

3202
	pr_debug("%s: we set peer primary addr primitively\n", __func__);
L
Linus Torvalds 已提交
3203 3204 3205 3206

	return err;
}

3207
static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3208
					    unsigned int optlen)
L
Linus Torvalds 已提交
3209
{
3210
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
3211

3212
	if (optlen != sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
3213
		return -EINVAL;
3214
	if (copy_from_user(&adaptation, optval, optlen))
L
Linus Torvalds 已提交
3215 3216
		return -EFAULT;

3217
	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
L
Linus Torvalds 已提交
3218 3219 3220 3221

	return 0;
}

3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236
/*
 * 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,
3237
				   unsigned int optlen)
3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
{
	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;
}

3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287
/*
 * 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,
3288
					       unsigned int optlen)
3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301
{
	int val;

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

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

	return 0;
}

3302
/*
3303
 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3304
 *       (SCTP_PARTIAL_DELIVERY_POINT)
3305
 *
3306 3307 3308
 * 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
3309
 * lower value will cause partial deliveries to happen more often.  The
3310
 * calls argument is an integer that sets or gets the partial delivery
3311 3312 3313 3314 3315 3316 3317
 * 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.
3318 3319 3320
 */
static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
						  char __user *optval,
3321
						  unsigned int optlen)
3322 3323 3324 3325 3326 3327 3328 3329
{
	u32 val;

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

3330 3331 3332 3333 3334 3335
	/* 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;

3336 3337 3338 3339 3340
	sctp_sk(sk)->pd_point = val;

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

3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
/*
 * 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,
3354
				    unsigned int optlen)
3355
{
3356 3357 3358
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
3359
	int val;
3360
	int assoc_id = 0;
3361

3362
	if (optlen == sizeof(int)) {
3363
		pr_warn_ratelimited(DEPRECATED
3364
				    "%s (pid %d) "
3365
				    "Use of int in max_burst socket option deprecated.\n"
3366 3367
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3368 3369 3370 3371 3372 3373 3374 3375
		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
3376 3377
		return -EINVAL;

3378 3379 3380 3381 3382 3383 3384 3385 3386
	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;
3387 3388 3389 3390

	return 0;
}

3391 3392 3393 3394 3395 3396 3397 3398
/*
 * 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,
3399 3400
				      char __user *optval,
				      unsigned int optlen)
3401
{
3402
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3403 3404
	struct sctp_authchunk val;

3405
	if (!ep->auth_enable)
3406 3407
		return -EACCES;

3408 3409 3410 3411 3412 3413
	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
3414 3415 3416 3417 3418
	case SCTP_CID_INIT:
	case SCTP_CID_INIT_ACK:
	case SCTP_CID_SHUTDOWN_COMPLETE:
	case SCTP_CID_AUTH:
		return -EINVAL;
3419 3420 3421
	}

	/* add this chunk id to the endpoint */
3422
	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3423 3424 3425 3426 3427 3428 3429 3430 3431
}

/*
 * 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,
3432 3433
				      char __user *optval,
				      unsigned int optlen)
3434
{
3435
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3436
	struct sctp_hmacalgo *hmacs;
3437
	u32 idents;
3438 3439
	int err;

3440
	if (!ep->auth_enable)
3441 3442
		return -EACCES;

3443 3444 3445
	if (optlen < sizeof(struct sctp_hmacalgo))
		return -EINVAL;

3446
	hmacs = memdup_user(optval, optlen);
3447 3448
	if (IS_ERR(hmacs))
		return PTR_ERR(hmacs);
3449

3450 3451 3452
	idents = hmacs->shmac_num_idents;
	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3453 3454 3455 3456
		err = -EINVAL;
		goto out;
	}

3457
	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470
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,
3471
				    unsigned int optlen)
3472
{
3473
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3474 3475 3476 3477
	struct sctp_authkey *authkey;
	struct sctp_association *asoc;
	int ret;

3478
	if (!ep->auth_enable)
3479 3480
		return -EACCES;

3481 3482 3483
	if (optlen <= sizeof(struct sctp_authkey))
		return -EINVAL;

3484
	authkey = memdup_user(optval, optlen);
3485 3486
	if (IS_ERR(authkey))
		return PTR_ERR(authkey);
3487

3488
	if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3489 3490 3491 3492
		ret = -EINVAL;
		goto out;
	}

3493 3494 3495 3496 3497 3498
	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
	if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
		ret = -EINVAL;
		goto out;
	}

3499
	ret = sctp_auth_set_key(ep, asoc, authkey);
3500
out:
3501
	kzfree(authkey);
3502 3503 3504 3505 3506 3507 3508 3509 3510 3511
	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,
3512 3513
				      char __user *optval,
				      unsigned int optlen)
3514
{
3515
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3516 3517 3518
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3519
	if (!ep->auth_enable)
3520 3521
		return -EACCES;

3522 3523 3524 3525 3526 3527 3528 3529 3530
	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;

3531
	return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3532 3533 3534 3535 3536 3537 3538 3539
}

/*
 * 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,
3540 3541
				   char __user *optval,
				   unsigned int optlen)
3542
{
3543
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3544 3545 3546
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3547
	if (!ep->auth_enable)
3548 3549
		return -EACCES;

3550 3551 3552 3553 3554 3555 3556 3557 3558
	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;

3559
	return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3560 3561 3562

}

3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591
/*
 * 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;

3592
	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3593 3594 3595 3596 3597
	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,
3598
		    &sock_net(sk)->sctp.auto_asconf_splist);
3599 3600
		sp->do_auto_asconf = 1;
	}
3601
	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3602 3603 3604
	return 0;
}

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

3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670
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;
}

3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686
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;
}

3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719
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;
}

3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760
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;
}

3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793
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;
}

3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
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;
}

3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855
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;

	if (optlen < sizeof(struct sctp_reset_streams))
		return -EINVAL;

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

	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_streams(asoc, params);

out:
	kfree(params);
	return retval;
}

3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881
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;
}

3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907
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;
}

L
Linus Torvalds 已提交
3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926
/* 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.
 */
3927 3928
static int sctp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3929 3930 3931
{
	int retval = 0;

3932
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945

	/* 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;
	}

3946
	lock_sock(sk);
L
Linus Torvalds 已提交
3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960

	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;

3961 3962 3963 3964 3965 3966 3967
	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
3968 3969
	case SCTP_SOCKOPT_CONNECTX:
		/* 'optlen' is the size of the addresses buffer. */
3970 3971 3972
		retval = sctp_setsockopt_connectx(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
F
Frank Filz 已提交
3973 3974
		break;

L
Linus Torvalds 已提交
3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990
	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;

3991
	case SCTP_DELAYED_SACK:
3992
		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3993
		break;
3994 3995 3996
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
		break;
3997

L
Linus Torvalds 已提交
3998 3999 4000 4001 4002 4003 4004
	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;
4005 4006 4007
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028
	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;
4029 4030
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
L
Linus Torvalds 已提交
4031
		break;
4032 4033 4034
	case SCTP_CONTEXT:
		retval = sctp_setsockopt_context(sk, optval, optlen);
		break;
4035 4036 4037
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
		break;
4038 4039 4040
	case SCTP_MAX_BURST:
		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
		break;
4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055
	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;
4056 4057 4058
	case SCTP_AUTO_ASCONF:
		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
		break;
4059 4060 4061
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
		break;
4062 4063 4064
	case SCTP_RECVRCVINFO:
		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
		break;
4065 4066 4067
	case SCTP_RECVNXTINFO:
		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
		break;
4068 4069 4070
	case SCTP_PR_SUPPORTED:
		retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
		break;
4071 4072 4073
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
		break;
4074 4075 4076
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
		break;
4077 4078 4079
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
		break;
4080 4081 4082
	case SCTP_RESET_STREAMS:
		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
		break;
4083 4084 4085
	case SCTP_RESET_ASSOC:
		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
		break;
4086 4087 4088
	case SCTP_ADD_STREAMS:
		retval = sctp_setsockopt_add_streams(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
4089 4090 4091
	default:
		retval = -ENOPROTOOPT;
		break;
4092
	}
L
Linus Torvalds 已提交
4093

4094
	release_sock(sk);
L
Linus Torvalds 已提交
4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115

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.
 */
4116 4117
static int sctp_connect(struct sock *sk, struct sockaddr *addr,
			int addr_len)
L
Linus Torvalds 已提交
4118 4119
{
	int err = 0;
F
Frank Filz 已提交
4120
	struct sctp_af *af;
L
Linus Torvalds 已提交
4121

4122
	lock_sock(sk);
L
Linus Torvalds 已提交
4123

4124 4125
	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
4126

F
Frank Filz 已提交
4127 4128 4129 4130 4131 4132 4133 4134
	/* 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.
		 */
4135
		err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
L
Linus Torvalds 已提交
4136 4137
	}

4138
	release_sock(sk);
L
Linus Torvalds 已提交
4139 4140 4141 4142
	return err;
}

/* FIXME: Write comments. */
4143
static int sctp_disconnect(struct sock *sk, int flags)
L
Linus Torvalds 已提交
4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154
{
	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.
 */
4155
static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
L
Linus Torvalds 已提交
4156 4157 4158 4159 4160 4161 4162 4163
{
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sock *newsk = NULL;
	struct sctp_association *asoc;
	long timeo;
	int error = 0;

4164
	lock_sock(sk);
L
Linus Torvalds 已提交
4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178

	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;
	}

4179
	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
L
Linus Torvalds 已提交
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189

	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);

4190
	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
L
Linus Torvalds 已提交
4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201
	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:
4202
	release_sock(sk);
4203
	*err = error;
L
Linus Torvalds 已提交
4204 4205 4206 4207
	return newsk;
}

/* The SCTP ioctl handler. */
4208
static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
L
Linus Torvalds 已提交
4209
{
4210 4211
	int rc = -ENOTCONN;

4212
	lock_sock(sk);
4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235

	/*
	 * 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;
4236
	}
4237 4238 4239 4240 4241
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
4242
	release_sock(sk);
4243
	return rc;
L
Linus Torvalds 已提交
4244 4245 4246 4247 4248 4249
}

/* 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.
 */
4250
static int sctp_init_sock(struct sock *sk)
L
Linus Torvalds 已提交
4251
{
4252
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4253 4254
	struct sctp_sock *sp;

4255
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270

	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
4271 4272
	sk->sk_gso_type = SKB_GSO_SCTP;

L
Linus Torvalds 已提交
4273 4274 4275 4276 4277 4278 4279 4280 4281
	/* 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;

4282
	sp->default_rcv_context = 0;
4283
	sp->max_burst = net->sctp.max_burst;
4284

4285 4286
	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;

L
Linus Torvalds 已提交
4287 4288 4289 4290 4291 4292
	/* 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;
4293 4294
	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
4295 4296 4297 4298

	/* Initialize default RTO related parameters.  These parameters can
	 * be modified for with the SCTP_RTOINFO socket option.
	 */
4299 4300 4301
	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
4302 4303 4304 4305

	/* Initialize default association related parameters. These parameters
	 * can be modified with the SCTP_ASSOCINFO socket option.
	 */
4306
	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
L
Linus Torvalds 已提交
4307 4308 4309
	sp->assocparams.sasoc_number_peer_destinations = 0;
	sp->assocparams.sasoc_peer_rwnd = 0;
	sp->assocparams.sasoc_local_rwnd = 0;
4310
	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
L
Linus Torvalds 已提交
4311 4312

	/* Initialize default event subscriptions. By default, all the
4313
	 * options are off.
L
Linus Torvalds 已提交
4314 4315 4316 4317 4318 4319
	 */
	memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));

	/* Default Peer Address Parameters.  These defaults can
	 * be modified via SCTP_PEER_ADDR_PARAMS
	 */
4320 4321
	sp->hbinterval  = net->sctp.hb_interval;
	sp->pathmaxrxt  = net->sctp.max_retrans_path;
4322
	sp->pathmtu     = 0; /* allow default discovery */
4323
	sp->sackdelay   = net->sctp.sack_timeout;
4324
	sp->sackfreq	= 2;
4325
	sp->param_flags = SPP_HB_ENABLE |
4326 4327
			  SPP_PMTUD_ENABLE |
			  SPP_SACKDELAY_ENABLE;
L
Linus Torvalds 已提交
4328 4329 4330 4331 4332 4333

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

4334 4335
	/* Enable Nagle algorithm by default.  */
	sp->nodelay           = 0;
L
Linus Torvalds 已提交
4336

4337
	sp->recvrcvinfo = 0;
4338
	sp->recvnxtinfo = 0;
4339

L
Linus Torvalds 已提交
4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352
	/* 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;

4353
	sp->adaptation_ind = 0;
L
Linus Torvalds 已提交
4354 4355 4356 4357

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

	/* Control variables for partial data delivery. */
4358
	atomic_set(&sp->pd_mode, 0);
L
Linus Torvalds 已提交
4359
	skb_queue_head_init(&sp->pd_lobby);
4360
	sp->frag_interleave = 0;
L
Linus Torvalds 已提交
4361 4362 4363 4364 4365

	/* 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.
	 */
4366 4367
	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
	if (!sp->ep)
L
Linus Torvalds 已提交
4368 4369 4370 4371
		return -ENOMEM;

	sp->hmac = NULL;

4372 4373
	sk->sk_destruct = sctp_destruct_sock;

L
Linus Torvalds 已提交
4374
	SCTP_DBG_OBJCNT_INC(sock);
4375 4376

	local_bh_disable();
4377
	percpu_counter_inc(&sctp_sockets_allocated);
4378
	sock_prot_inuse_add(net, sk->sk_prot, 1);
4379 4380 4381 4382

	/* Nothing can fail after this block, otherwise
	 * sctp_destroy_sock() will be called without addr_wq_lock held
	 */
4383
	if (net->sctp.default_auto_asconf) {
4384
		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4385
		list_add_tail(&sp->auto_asconf_list,
4386
		    &net->sctp.auto_asconf_splist);
4387
		sp->do_auto_asconf = 1;
4388 4389
		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
	} else {
4390
		sp->do_auto_asconf = 0;
4391 4392
	}

4393 4394
	local_bh_enable();

L
Linus Torvalds 已提交
4395 4396 4397
	return 0;
}

4398 4399 4400
/* 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
 */
4401
static void sctp_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
4402
{
4403
	struct sctp_sock *sp;
L
Linus Torvalds 已提交
4404

4405
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4406 4407

	/* Release our hold on the endpoint. */
4408
	sp = sctp_sk(sk);
4409 4410 4411 4412 4413 4414
	/* 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;

4415 4416 4417 4418 4419
	if (sp->do_auto_asconf) {
		sp->do_auto_asconf = 0;
		list_del(&sp->auto_asconf_list);
	}
	sctp_endpoint_free(sp->ep);
4420
	local_bh_disable();
4421
	percpu_counter_dec(&sctp_sockets_allocated);
4422
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4423
	local_bh_enable();
L
Linus Torvalds 已提交
4424 4425
}

4426 4427 4428 4429 4430 4431
/* 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
4432
	crypto_free_shash(sp->hmac);
4433 4434 4435 4436

	inet_sock_destruct(sk);
}

L
Linus Torvalds 已提交
4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452
/* 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.
 */
4453
static void sctp_shutdown(struct sock *sk, int how)
L
Linus Torvalds 已提交
4454
{
4455
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4456 4457 4458 4459 4460
	struct sctp_endpoint *ep;

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

4461 4462 4463 4464
	ep = sctp_sk(sk)->ep;
	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
		struct sctp_association *asoc;

4465
		sk->sk_state = SCTP_SS_CLOSING;
4466 4467 4468
		asoc = list_entry(ep->asocs.next,
				  struct sctp_association, asocs);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
4469 4470 4471
	}
}

4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489
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;
4490
		info->sctpi_s_type = sp->type;
4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558

		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);
	info->sctpi_instrms = asoc->c.sinit_max_instreams;
	info->sctpi_outstrms = asoc->c.sinit_num_ostreams;
	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;
	memcpy(&info->sctpi_p_address, &prim->ipaddr,
	       sizeof(struct sockaddr_storage));
	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);

4559 4560 4561 4562 4563
/* use callback to avoid exporting the core structure */
int sctp_transport_walk_start(struct rhashtable_iter *iter)
{
	int err;

4564
	rhltable_walk_enter(&sctp_transport_hashtable, iter);
4565 4566

	err = rhashtable_walk_start(iter);
4567
	if (err && err != -EAGAIN) {
4568
		rhashtable_walk_stop(iter);
4569 4570 4571
		rhashtable_walk_exit(iter);
		return err;
	}
4572

4573
	return 0;
4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 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 4636 4637 4638 4639 4640 4641 4642 4643
}

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++) {
		read_lock(&head->lock);
		sctp_for_each_hentry(epb, &head->chain) {
			err = cb(sctp_ep(epb), p);
			if (err)
				break;
		}
		read_unlock(&head->lock);
	}

	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;
4644
	int err;
4645 4646 4647

	rcu_read_lock();
	transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4648
	rcu_read_unlock();
4649
	if (!transport)
4650
		return -ENOENT;
4651 4652

	err = cb(transport, p);
4653
	sctp_transport_put(transport);
4654

4655 4656 4657 4658 4659 4660 4661 4662
	return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);

int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
			    struct net *net, int pos, void *p) {
	struct rhashtable_iter hti;
	void *obj;
4663
	int err;
4664

4665 4666 4667
	err = sctp_transport_walk_start(&hti);
	if (err)
		return err;
4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681

	sctp_transport_get_idx(net, &hti, pos);
	obj = sctp_transport_get_next(net, &hti);
	for (; obj && !IS_ERR(obj); obj = sctp_transport_get_next(net, &hti)) {
		struct sctp_transport *transport = obj;

		if (!sctp_transport_hold(transport))
			continue;
		err = cb(transport, p);
		sctp_transport_put(transport);
		if (err)
			break;
	}
	sctp_transport_walk_stop(&hti);
4682

4683 4684 4685 4686
	return err;
}
EXPORT_SYMBOL_GPL(sctp_for_each_transport);

L
Linus Torvalds 已提交
4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
/* 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;

4704
	if (len < sizeof(status)) {
L
Linus Torvalds 已提交
4705 4706 4707 4708
		retval = -EINVAL;
		goto out;
	}

4709 4710
	len = sizeof(status);
	if (copy_from_user(&status, optval, len)) {
L
Linus Torvalds 已提交
4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
		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);
4725
	status.sstat_state = sctp_assoc_to_state(asoc);
L
Linus Torvalds 已提交
4726 4727 4728 4729 4730 4731 4732 4733
	status.sstat_rwnd =  asoc->peer.rwnd;
	status.sstat_unackdata = asoc->unack_data;

	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
	status.sstat_instrms = asoc->c.sinit_max_instreams;
	status.sstat_outstrms = asoc->c.sinit_num_ostreams;
	status.sstat_fragmentation_point = asoc->frag_point;
	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4734 4735
	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
			transport->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
4736
	/* Map ipv4 address into v4-mapped-on-v6 address.  */
4737
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
4738
		(union sctp_addr *)&status.sstat_primary.spinfo_address);
F
Frank Filz 已提交
4739
	status.sstat_primary.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4740 4741 4742
	status.sstat_primary.spinfo_cwnd = transport->cwnd;
	status.sstat_primary.spinfo_srtt = transport->srtt;
	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4743
	status.sstat_primary.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4744

F
Frank Filz 已提交
4745 4746 4747
	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
		status.sstat_primary.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4748 4749 4750 4751 4752
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

4753 4754 4755
	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
4756 4757 4758 4759 4760 4761 4762

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

out:
E
Eric Dumazet 已提交
4763
	return retval;
L
Linus Torvalds 已提交
4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781
}


/* 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;

4782
	if (len < sizeof(pinfo)) {
L
Linus Torvalds 已提交
4783 4784 4785 4786
		retval = -EINVAL;
		goto out;
	}

4787 4788
	len = sizeof(pinfo);
	if (copy_from_user(&pinfo, optval, len)) {
L
Linus Torvalds 已提交
4789 4790 4791 4792 4793 4794 4795 4796 4797 4798
		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
4799
	pinfo.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4800 4801 4802
	pinfo.spinfo_cwnd = transport->cwnd;
	pinfo.spinfo_srtt = transport->srtt;
	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4803
	pinfo.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4804

F
Frank Filz 已提交
4805 4806 4807
	if (pinfo.spinfo_state == SCTP_UNKNOWN)
		pinfo.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818
	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
4819
	return retval;
L
Linus Torvalds 已提交
4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853
}

/* 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
4854
	if (len == 0)
L
Linus Torvalds 已提交
4855
		return -EINVAL;
4856 4857
	if (len > sizeof(struct sctp_event_subscribe))
		len = sizeof(struct sctp_event_subscribe);
4858 4859
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880
	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;
4881
	if (len < sizeof(int))
L
Linus Torvalds 已提交
4882
		return -EINVAL;
4883 4884 4885 4886
	len = sizeof(int);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
L
Linus Torvalds 已提交
4887 4888 4889 4890 4891
		return -EFAULT;
	return 0;
}

/* Helper routine to branch off an association to a new socket.  */
B
Benjamin Poirier 已提交
4892
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
L
Linus Torvalds 已提交
4893
{
B
Benjamin Poirier 已提交
4894
	struct sctp_association *asoc = sctp_id2assoc(sk, id);
4895
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
4896 4897 4898
	struct socket *sock;
	int err = 0;

B
Benjamin Poirier 已提交
4899 4900 4901
	if (!asoc)
		return -EINVAL;

4902 4903 4904 4905 4906 4907
	/* If there is a thread waiting on more sndbuf space for
	 * sending on this asoc, it cannot be peeled.
	 */
	if (waitqueue_active(&asoc->wait))
		return -EBUSY;

L
Linus Torvalds 已提交
4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918
	/* 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;

4919
	sctp_copy_sock(sock->sk, sk, asoc);
4920 4921 4922 4923

	/* Make peeled-off sockets more like 1-1 accepted sockets.
	 * Set the daddr and initialize id to something more random
	 */
4924
	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4925 4926 4927 4928 4929

	/* 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);
4930

L
Linus Torvalds 已提交
4931 4932 4933 4934
	*sockp = sock;

	return err;
}
B
Benjamin Poirier 已提交
4935
EXPORT_SYMBOL(sctp_do_peeloff);
L
Linus Torvalds 已提交
4936 4937 4938 4939 4940

static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	sctp_peeloff_arg_t peeloff;
	struct socket *newsock;
4941
	struct file *newfile;
L
Linus Torvalds 已提交
4942 4943
	int retval = 0;

4944
	if (len < sizeof(sctp_peeloff_arg_t))
L
Linus Torvalds 已提交
4945
		return -EINVAL;
4946
	len = sizeof(sctp_peeloff_arg_t);
L
Linus Torvalds 已提交
4947 4948 4949
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

B
Benjamin Poirier 已提交
4950
	retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
L
Linus Torvalds 已提交
4951 4952 4953 4954
	if (retval < 0)
		goto out;

	/* Map the socket to an unused fd that can be returned to the user.  */
4955
	retval = get_unused_fd_flags(0);
L
Linus Torvalds 已提交
4956 4957 4958 4959 4960
	if (retval < 0) {
		sock_release(newsock);
		goto out;
	}

4961
	newfile = sock_alloc_file(newsock, 0, NULL);
4962
	if (IS_ERR(newfile)) {
4963 4964 4965 4966 4967
		put_unused_fd(retval);
		sock_release(newsock);
		return PTR_ERR(newfile);
	}

4968 4969
	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
		 retval);
L
Linus Torvalds 已提交
4970 4971

	/* Return the fd mapped to the new socket.  */
4972 4973 4974 4975 4976
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
	}
L
Linus Torvalds 已提交
4977
	peeloff.sd = retval;
4978 4979 4980
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
		put_unused_fd(retval);
4981
		return -EFAULT;
4982 4983
	}
	fd_install(retval, newfile);
L
Linus Torvalds 已提交
4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997
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 {
4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009
 *     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
5010 5011
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
5012 5013 5014
 *                     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
5015 5016
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079
 *                     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
5080 5081
 */
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5082
					    char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
5083
{
5084 5085 5086 5087
	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
5088

5089
	if (len < sizeof(struct sctp_paddrparams))
L
Linus Torvalds 已提交
5090
		return -EINVAL;
5091
	len = sizeof(struct sctp_paddrparams);
L
Linus Torvalds 已提交
5092 5093 5094
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

5095 5096
	/* 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
5097
	 */
5098
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5099 5100 5101
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans) {
5102
			pr_debug("%s: failed no transport\n", __func__);
5103 5104
			return -EINVAL;
		}
L
Linus Torvalds 已提交
5105 5106
	}

5107 5108 5109 5110 5111 5112
	/* 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)) {
5113
		pr_debug("%s: failed no association\n", __func__);
L
Linus Torvalds 已提交
5114
		return -EINVAL;
5115
	}
L
Linus Torvalds 已提交
5116

5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140
	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
5141

5142 5143 5144
		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = sp->param_flags;
	}
L
Linus Torvalds 已提交
5145 5146 5147 5148 5149 5150 5151 5152 5153 5154

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

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

	return 0;
}

5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173
/*
 * 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;
 * };
5174
 *
5175 5176 5177 5178
 * 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).
5179
 *
5180 5181 5182 5183
 * 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.
5184
 *
5185 5186 5187 5188
 * 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.
5189
 */
5190
static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5191 5192 5193
					    char __user *optval,
					    int __user *optlen)
{
5194
	struct sctp_sack_info    params;
5195 5196 5197
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

5198 5199
	if (len >= sizeof(struct sctp_sack_info)) {
		len = sizeof(struct sctp_sack_info);
5200

5201 5202 5203
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else if (len == sizeof(struct sctp_assoc_value)) {
5204
		pr_warn_ratelimited(DEPRECATED
5205
				    "%s (pid %d) "
5206
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5207 5208
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
5209 5210 5211
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
5212
		return -EINVAL;
5213

5214
	/* Get association, if sack_assoc_id != 0 and the socket is a one
5215 5216
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
5217
	 */
5218 5219
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5220 5221 5222 5223
		return -EINVAL;

	if (asoc) {
		/* Fetch association values. */
5224 5225
		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay = jiffies_to_msecs(
5226
				asoc->sackdelay);
5227 5228 5229 5230 5231 5232
			params.sack_freq = asoc->sackfreq;

		} else {
			params.sack_delay = 0;
			params.sack_freq = 1;
		}
5233 5234
	} else {
		/* Fetch socket values. */
5235 5236 5237 5238 5239 5240 5241
		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;
		}
5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252
	}

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

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

	return 0;
}

L
Linus Torvalds 已提交
5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265
/* 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)
{
5266
	if (len < sizeof(struct sctp_initmsg))
L
Linus Torvalds 已提交
5267
		return -EINVAL;
5268 5269 5270
	len = sizeof(struct sctp_initmsg);
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5271 5272 5273 5274 5275
	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
		return -EFAULT;
	return 0;
}

5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301

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;

5302 5303
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5304

5305 5306
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
				transports) {
5307
		memcpy(&temp, &from->ipaddr, sizeof(temp));
5308 5309
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5310
		if (space_left < addrlen)
5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322
			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
5323 5324 5325 5326 5327
		return -EFAULT;

	return 0;
}

5328 5329
static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
			    size_t space_left, int *bytes_copied)
5330 5331 5332 5333 5334
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr temp;
	int cnt = 0;
	int addrlen;
5335
	struct net *net = sock_net(sk);
5336

5337
	rcu_read_lock();
5338
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5339 5340 5341
		if (!addr->valid)
			continue;

5342
		if ((PF_INET == sk->sk_family) &&
5343
		    (AF_INET6 == addr->a.sa.sa_family))
5344
			continue;
5345 5346 5347 5348
		if ((PF_INET6 == sk->sk_family) &&
		    inet_v6_ipv6only(sk) &&
		    (AF_INET == addr->a.sa.sa_family))
			continue;
5349
		memcpy(&temp, &addr->a, sizeof(temp));
5350 5351 5352
		if (!temp.v4.sin_port)
			temp.v4.sin_port = htons(port);

5353 5354 5355
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sctp_sk(sk), &temp);

5356 5357 5358 5359
		if (space_left < addrlen) {
			cnt =  -ENOMEM;
			break;
		}
5360
		memcpy(to, &temp, addrlen);
5361

5362
		to += addrlen;
5363
		cnt++;
5364
		space_left -= addrlen;
5365
		*bytes_copied += addrlen;
5366
	}
5367
	rcu_read_unlock();
5368 5369 5370 5371

	return cnt;
}

L
Linus Torvalds 已提交
5372

5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386
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;
5387 5388
	int bytes_copied = 0;
	void *addrs;
5389
	void *buf;
5390

5391
	if (len < sizeof(struct sctp_getaddrs))
5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411
		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;
	}

5412 5413
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5414

5415
	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5416 5417
	if (!addrs)
		return -ENOMEM;
5418 5419 5420 5421 5422 5423 5424

	/* 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);
5425
		if (sctp_is_any(sk, &addr->a)) {
5426 5427
			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
						space_left, &bytes_copied);
5428 5429
			if (cnt < 0) {
				err = cnt;
5430
				goto out;
5431
			}
5432
			goto copy_getaddrs;
5433 5434 5435
		}
	}

5436
	buf = addrs;
5437 5438 5439 5440 5441
	/* 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) {
5442
		memcpy(&temp, &addr->a, sizeof(temp));
5443 5444
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5445 5446
		if (space_left < addrlen) {
			err =  -ENOMEM; /*fixme: right error?*/
5447
			goto out;
5448
		}
5449 5450
		memcpy(buf, &temp, addrlen);
		buf += addrlen;
5451
		bytes_copied += addrlen;
5452
		cnt++;
5453 5454 5455 5456
		space_left -= addrlen;
	}

copy_getaddrs:
5457 5458
	if (copy_to_user(to, addrs, bytes_copied)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5459
		goto out;
5460
	}
5461 5462
	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5463
		goto out;
5464
	}
5465
	if (put_user(bytes_copied, optlen))
5466
		err = -EFAULT;
S
Sebastian Siewior 已提交
5467
out:
5468
	kfree(addrs);
5469 5470 5471
	return err;
}

L
Linus Torvalds 已提交
5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484
/* 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);

5485
	if (len < sizeof(struct sctp_prim))
L
Linus Torvalds 已提交
5486 5487
		return -EINVAL;

5488 5489 5490
	len = sizeof(struct sctp_prim);

	if (copy_from_user(&prim, optval, len))
L
Linus Torvalds 已提交
5491 5492 5493 5494 5495 5496 5497 5498
		return -EFAULT;

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

	if (!asoc->peer.primary_path)
		return -ENOTCONN;
5499

5500 5501
	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
		asoc->peer.primary_path->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
5502

5503
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
L
Linus Torvalds 已提交
5504 5505
			(union sctp_addr *)&prim.ssp_addr);

5506 5507 5508
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &prim, len))
L
Linus Torvalds 已提交
5509 5510 5511 5512 5513 5514
		return -EFAULT;

	return 0;
}

/*
5515
 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
L
Linus Torvalds 已提交
5516
 *
5517
 * Requests that the local endpoint set the specified Adaptation Layer
L
Linus Torvalds 已提交
5518 5519
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
5520
static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
L
Linus Torvalds 已提交
5521 5522
				  char __user *optval, int __user *optlen)
{
5523
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
5524

5525
	if (len < sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
5526 5527
		return -EINVAL;

5528 5529
	len = sizeof(struct sctp_setadaptation);

5530
	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5531 5532 5533

	if (put_user(len, optlen))
		return -EFAULT;
5534
	if (copy_to_user(optval, &adaptation, len))
L
Linus Torvalds 已提交
5535
		return -EFAULT;
5536

L
Linus Torvalds 已提交
5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563
	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);
5564 5565
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
5566

5567
	if (len < sizeof(info))
L
Linus Torvalds 已提交
5568
		return -EINVAL;
5569

5570
	len = sizeof(info);
5571 5572

	if (copy_from_user(&info, optval, len))
L
Linus Torvalds 已提交
5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591
		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;
	}

5592 5593 5594
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
L
Linus Torvalds 已提交
5595 5596 5597 5598 5599
		return -EFAULT;

	return 0;
}

5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641
/* 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
5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686
/*
 *
 * 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;

5687
	if (len < sizeof (struct sctp_rtoinfo))
L
Linus Torvalds 已提交
5688 5689
		return -EINVAL;

5690 5691 5692
	len = sizeof(struct sctp_rtoinfo);

	if (copy_from_user(&rtoinfo, optval, len))
L
Linus Torvalds 已提交
5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726
		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
 *
5727
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743
 * 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;

5744
	if (len < sizeof (struct sctp_assocparams))
L
Linus Torvalds 已提交
5745 5746
		return -EINVAL;

5747 5748 5749
	len = sizeof(struct sctp_assocparams);

	if (copy_from_user(&assocparams, optval, len))
L
Linus Torvalds 已提交
5750 5751 5752 5753 5754 5755 5756 5757
		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 */
5758
	if (asoc) {
L
Linus Torvalds 已提交
5759 5760 5761
		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5762
		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
L
Linus Torvalds 已提交
5763 5764

		list_for_each(pos, &asoc->peer.transport_addr_list) {
5765
			cnt++;
L
Linus Torvalds 已提交
5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 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
		}

		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;
}

5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831
/*
 * 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;

5832
	if (len < sizeof(struct sctp_assoc_value))
5833 5834
		return -EINVAL;

5835 5836
	len = sizeof(struct sctp_assoc_value);

5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858
	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
5859
/*
5860 5861 5862
 * 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
5863 5864 5865
 * 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
5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884
 * 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
5885 5886 5887 5888
 */
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
				  char __user *optval, int __user *optlen)
{
5889 5890
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
L
Linus Torvalds 已提交
5891

5892
	if (len == sizeof(int)) {
5893
		pr_warn_ratelimited(DEPRECATED
5894
				    "%s (pid %d) "
5895
				    "Use of int in maxseg socket option.\n"
5896 5897
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
5898 5899 5900 5901 5902 5903
		params.assoc_id = 0;
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
		if (copy_from_user(&params, optval, sizeof(params)))
			return -EFAULT;
	} else
L
Linus Torvalds 已提交
5904 5905
		return -EINVAL;

5906 5907 5908 5909 5910 5911 5912 5913
	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
5914 5915 5916

	if (put_user(len, optlen))
		return -EFAULT;
5917 5918 5919 5920 5921 5922 5923
	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
5924 5925 5926 5927

	return 0;
}

5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950
/*
 * 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;
}

5951 5952 5953 5954 5955 5956 5957 5958
/*
 * 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)
{
5959
	u32 val;
5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971

	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;

5972
	return 0;
5973 5974
}

5975 5976 5977 5978 5979 5980 5981 5982
/*
 * 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)
{
5983 5984 5985
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
5986

5987
	if (len == sizeof(int)) {
5988
		pr_warn_ratelimited(DEPRECATED
5989
				    "%s (pid %d) "
5990
				    "Use of int in max_burst socket option.\n"
5991 5992
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
5993
		params.assoc_id = 0;
5994 5995
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
5996 5997 5998 5999
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
		return -EINVAL;
6000

6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019
	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;
6020 6021 6022

}

6023 6024 6025
static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6026
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6027
	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6028
	struct sctp_hmac_algo_param *hmacs;
6029 6030
	__u16 data_len = 0;
	u32 num_idents;
6031
	int i;
6032

6033
	if (!ep->auth_enable)
6034
		return -EACCES;
6035

6036
	hmacs = ep->auth_hmacs_list;
6037
	data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
6038

6039
	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6040
		return -EINVAL;
6041 6042 6043 6044

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

6045 6046
	if (put_user(len, optlen))
		return -EFAULT;
6047 6048
	if (put_user(num_idents, &p->shmac_num_idents))
		return -EFAULT;
6049 6050 6051 6052 6053 6054
	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;
	}
6055 6056 6057 6058 6059 6060
	return 0;
}

static int sctp_getsockopt_active_key(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6061
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6062 6063 6064
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

6065
	if (!ep->auth_enable)
6066 6067
		return -EACCES;

6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079
	if (len < sizeof(struct sctp_authkeyid))
		return -EINVAL;
	if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
		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
6080
		val.scact_keynumber = ep->active_key_id;
6081

6082 6083 6084 6085 6086 6087
	len = sizeof(struct sctp_authkeyid);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6088 6089 6090 6091 6092 6093
	return 0;
}

static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6094
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6095
	struct sctp_authchunks __user *p = (void __user *)optval;
6096 6097 6098
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6099
	u32    num_chunks = 0;
6100 6101
	char __user *to;

6102
	if (!ep->auth_enable)
6103 6104 6105
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6106 6107
		return -EINVAL;

6108
	if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6109 6110
		return -EFAULT;

A
Al Viro 已提交
6111
	to = p->gauth_chunks;
6112 6113 6114 6115 6116
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc)
		return -EINVAL;

	ch = asoc->peer.peer_chunks;
6117 6118
	if (!ch)
		goto num;
6119 6120

	/* See if the user provided enough room for all the data */
6121 6122
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
	if (len < num_chunks)
6123 6124
		return -EINVAL;

6125
	if (copy_to_user(to, ch->chunks, num_chunks))
6126
		return -EFAULT;
6127 6128
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6129 6130
	if (put_user(len, optlen))
		return -EFAULT;
6131 6132
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6133 6134 6135 6136 6137 6138
	return 0;
}

static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6139
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6140
	struct sctp_authchunks __user *p = (void __user *)optval;
6141 6142 6143
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6144
	u32    num_chunks = 0;
6145 6146
	char __user *to;

6147
	if (!ep->auth_enable)
6148 6149 6150
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6151 6152
		return -EINVAL;

6153
	if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6154 6155
		return -EFAULT;

A
Al Viro 已提交
6156
	to = p->gauth_chunks;
6157 6158 6159 6160 6161
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
6162
		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6163
	else
6164
		ch = ep->auth_chunk_list;
6165

6166 6167 6168
	if (!ch)
		goto num;

6169
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
6170
	if (len < sizeof(struct sctp_authchunks) + num_chunks)
6171 6172
		return -EINVAL;

6173 6174 6175 6176
	if (copy_to_user(to, ch->chunks, num_chunks))
		return -EFAULT;
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6177 6178
	if (put_user(len, optlen))
		return -EFAULT;
6179 6180
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6181 6182 6183 6184

	return 0;
}

6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216
/*
 * 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;
}

6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238
/*
 * 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;
}

6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268
/*
 * 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;

6269
	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287
	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;
}

6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332
/*
 * 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;
}

6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349
/*
 * 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;

6350 6351 6352
	/* Allow the struct to grow and fill in as much as possible */
	len = min_t(size_t, len, sizeof(sas));

6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388
	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;

6389
	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6390 6391 6392 6393 6394 6395 6396

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

	return 0;
}

6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416
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;
}

6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436
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;
}

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
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;
}

6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520
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;
}

6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578
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;
}

6579 6580 6581 6582 6583 6584 6585 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
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;
}

6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660
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;
}

6661 6662
static int sctp_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
6663 6664 6665 6666
{
	int retval = 0;
	int len;

6667
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684

	/* 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
6685 6686 6687
	if (len < 0)
		return -EINVAL;

6688
	lock_sock(sk);
L
Linus Torvalds 已提交
6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710

	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;
	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
							  optlen);
		break;
6711
	case SCTP_DELAYED_SACK:
6712
		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6713 6714
							  optlen);
		break;
L
Linus Torvalds 已提交
6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725
	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;
6726 6727 6728
	case SCTP_SOCKOPT_CONNECTX3:
		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
6729 6730 6731 6732
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_getsockopt_default_send_param(sk, len,
							    optval, optlen);
		break;
6733 6734 6735 6736
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_getsockopt_default_sndinfo(sk, len,
							 optval, optlen);
		break;
L
Linus Torvalds 已提交
6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758
	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;
6759 6760
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
L
Linus Torvalds 已提交
6761 6762
							optlen);
		break;
6763 6764 6765
	case SCTP_CONTEXT:
		retval = sctp_getsockopt_context(sk, len, optval, optlen);
		break;
6766 6767 6768 6769
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
							     optlen);
		break;
6770 6771 6772 6773
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
								optlen);
		break;
6774 6775 6776
	case SCTP_MAX_BURST:
		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
		break;
6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795
	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;
6796 6797 6798
	case SCTP_GET_ASSOC_NUMBER:
		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
		break;
6799 6800 6801
	case SCTP_GET_ASSOC_ID_LIST:
		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
		break;
6802 6803 6804
	case SCTP_AUTO_ASCONF:
		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
		break;
6805 6806 6807
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
		break;
6808 6809 6810
	case SCTP_GET_ASSOC_STATS:
		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
		break;
6811 6812 6813
	case SCTP_RECVRCVINFO:
		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
		break;
6814 6815 6816
	case SCTP_RECVNXTINFO:
		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
		break;
6817 6818 6819
	case SCTP_PR_SUPPORTED:
		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
		break;
6820 6821 6822 6823
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
							optlen);
		break;
6824 6825 6826 6827
	case SCTP_PR_ASSOC_STATUS:
		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
							optlen);
		break;
6828 6829 6830 6831
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
							    optlen);
		break;
6832 6833 6834 6835
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
							 optlen);
		break;
L
Linus Torvalds 已提交
6836 6837 6838
	default:
		retval = -ENOPROTOOPT;
		break;
6839
	}
L
Linus Torvalds 已提交
6840

6841
	release_sock(sk);
L
Linus Torvalds 已提交
6842 6843 6844
	return retval;
}

6845
static int sctp_hash(struct sock *sk)
L
Linus Torvalds 已提交
6846 6847
{
	/* STUB */
6848
	return 0;
L
Linus Torvalds 已提交
6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868
}

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(
6869
	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
L
Linus Torvalds 已提交
6870 6871 6872 6873

static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
{
	struct sctp_bind_hashbucket *head; /* hash list */
6874
	struct sctp_bind_bucket *pp;
L
Linus Torvalds 已提交
6875 6876 6877
	unsigned short snum;
	int ret;

A
Al Viro 已提交
6878
	snum = ntohs(addr->v4.sin_port);
L
Linus Torvalds 已提交
6879

6880 6881
	pr_debug("%s: begins, snum:%d\n", __func__, snum);

6882
	local_bh_disable();
L
Linus Torvalds 已提交
6883 6884

	if (snum == 0) {
S
Stephen Hemminger 已提交
6885
		/* Search for an available port. */
6886 6887
		int low, high, remaining, index;
		unsigned int rover;
6888
		struct net *net = sock_net(sk);
6889

6890
		inet_get_local_port_range(net, &low, &high);
6891
		remaining = (high - low) + 1;
6892
		rover = prandom_u32() % remaining + low;
L
Linus Torvalds 已提交
6893 6894 6895 6896 6897

		do {
			rover++;
			if ((rover < low) || (rover > high))
				rover = low;
6898
			if (inet_is_local_reserved_port(net, rover))
6899
				continue;
6900
			index = sctp_phashfn(sock_net(sk), rover);
L
Linus Torvalds 已提交
6901
			head = &sctp_port_hashtable[index];
6902
			spin_lock(&head->lock);
6903
			sctp_for_each_hentry(pp, &head->chain)
6904 6905
				if ((pp->port == rover) &&
				    net_eq(sock_net(sk), pp->net))
L
Linus Torvalds 已提交
6906 6907 6908
					goto next;
			break;
		next:
6909
			spin_unlock(&head->lock);
L
Linus Torvalds 已提交
6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928
		} 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.
		 */
6929
		head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6930
		spin_lock(&head->lock);
6931
		sctp_for_each_hentry(pp, &head->chain) {
6932
			if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
L
Linus Torvalds 已提交
6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945 6946 6947
				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;

6948 6949
		pr_debug("%s: found a possible match\n", __func__);

6950 6951
		if (pp->fastreuse && sk->sk_reuse &&
			sk->sk_state != SCTP_SS_LISTENING)
L
Linus Torvalds 已提交
6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963
			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.
		 */
6964
		sk_for_each_bound(sk2, &pp->owner) {
L
Linus Torvalds 已提交
6965 6966 6967
			struct sctp_endpoint *ep2;
			ep2 = sctp_sk(sk2)->ep;

6968 6969 6970
			if (sk == sk2 ||
			    (reuse && sk2->sk_reuse &&
			     sk2->sk_state != SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
6971 6972
				continue;

6973 6974
			if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
						 sctp_sk(sk2), sctp_sk(sk))) {
L
Linus Torvalds 已提交
6975 6976 6977 6978
				ret = (long)sk2;
				goto fail_unlock;
			}
		}
6979 6980

		pr_debug("%s: found a match\n", __func__);
L
Linus Torvalds 已提交
6981 6982 6983 6984
	}
pp_not_found:
	/* If there was a hash table miss, create a new port.  */
	ret = 1;
6985
	if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
L
Linus Torvalds 已提交
6986 6987 6988 6989 6990 6991
		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-).
	 */
6992 6993 6994 6995 6996 6997 6998
	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
6999 7000 7001 7002 7003 7004 7005 7006
		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
7007
		inet_sk(sk)->inet_num = snum;
L
Linus Torvalds 已提交
7008 7009 7010 7011 7012 7013
		sk_add_bind_node(sk, &pp->owner);
		sctp_sk(sk)->bind_hash = pp;
	}
	ret = 0;

fail_unlock:
7014
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7015 7016

fail:
7017
	local_bh_enable();
L
Linus Torvalds 已提交
7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033
	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. */
7034
	return !!sctp_get_port_local(sk, &addr);
L
Linus Torvalds 已提交
7035 7036 7037
}

/*
7038
 *  Move a socket to LISTENING state.
L
Linus Torvalds 已提交
7039
 */
7040
static int sctp_listen_start(struct sock *sk, int backlog)
L
Linus Torvalds 已提交
7041 7042 7043
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
H
Herbert Xu 已提交
7044
	struct crypto_shash *tfm = NULL;
7045
	char alg[32];
L
Linus Torvalds 已提交
7046

7047
	/* Allocate HMAC for generating cookie. */
7048 7049
	if (!sp->hmac && sp->sctp_hmac_alg) {
		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
H
Herbert Xu 已提交
7050
		tfm = crypto_alloc_shash(alg, 0, 0);
7051
		if (IS_ERR(tfm)) {
7052
			net_info_ratelimited("failed to load transform for %s: %ld\n",
7053
					     sp->sctp_hmac_alg, PTR_ERR(tfm));
7054 7055 7056
			return -ENOSYS;
		}
		sctp_sk(sk)->hmac = tfm;
L
Linus Torvalds 已提交
7057 7058 7059 7060 7061 7062 7063 7064 7065 7066 7067
	}

	/*
	 * 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.
7068
	 *
L
Linus Torvalds 已提交
7069
	 */
7070
	sk->sk_state = SCTP_SS_LISTENING;
L
Linus Torvalds 已提交
7071 7072 7073
	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
7074
	} else {
E
Eric Dumazet 已提交
7075
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7076 7077 7078 7079
			sk->sk_state = SCTP_SS_CLOSED;
			return -EADDRINUSE;
		}
	}
7080

L
Linus Torvalds 已提交
7081 7082 7083 7084 7085 7086
	sk->sk_max_ack_backlog = backlog;
	sctp_hash_endpoint(ep);
	return 0;
}

/*
7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097
 * 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
7098 7099 7100 7101 7102
 *  Move a socket to LISTENING state.
 */
int sctp_inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
7103
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
L
Linus Torvalds 已提交
7104 7105 7106
	int err = -EINVAL;

	if (unlikely(backlog < 0))
7107
		return err;
L
Linus Torvalds 已提交
7108

7109
	lock_sock(sk);
L
Linus Torvalds 已提交
7110

7111 7112 7113 7114
	/* Peeled-off sockets are not allowed to listen().  */
	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
		goto out;

L
Linus Torvalds 已提交
7115 7116 7117
	if (sock->state != SS_UNCONNECTED)
		goto out;

7118 7119 7120
	/* If backlog is zero, disable listening. */
	if (!backlog) {
		if (sctp_sstate(sk, CLOSED))
L
Linus Torvalds 已提交
7121 7122
			goto out;

7123 7124 7125 7126 7127 7128
		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;
7129 7130
	}

7131 7132 7133 7134 7135 7136 7137 7138
	/* 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
7139

7140
	err = 0;
L
Linus Torvalds 已提交
7141
out:
7142
	release_sock(sk);
L
Linus Torvalds 已提交
7143 7144 7145 7146 7147 7148 7149 7150
	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
7151
 * the integrity of the counters (sndbuf and wmem_alloc) used
L
Linus Torvalds 已提交
7152 7153 7154 7155 7156 7157 7158 7159 7160 7161 7162 7163 7164
 * in this place.  We assume that we don't need locks either until proven
 * otherwise.
 *
 * Another thing to note is that we include the Async I/O support
 * here, again, by modeling the current TCP/UDP code.  We don't have
 * a good way to test with it yet.
 */
unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
{
	struct sock *sk = sock->sk;
	struct sctp_sock *sp = sctp_sk(sk);
	unsigned int mask;

E
Eric Dumazet 已提交
7165
	poll_wait(file, sk_sleep(sk), wait);
L
Linus Torvalds 已提交
7166

7167 7168
	sock_rps_record_flow(sk);

L
Linus Torvalds 已提交
7169 7170 7171 7172 7173
	/* 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)) ?
7174
			(POLLIN | POLLRDNORM) : 0;
L
Linus Torvalds 已提交
7175 7176 7177 7178 7179

	mask = 0;

	/* Is there any exceptional events?  */
	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7180
		mask |= POLLERR |
7181
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
7182
	if (sk->sk_shutdown & RCV_SHUTDOWN)
E
Eric Dumazet 已提交
7183
		mask |= POLLRDHUP | POLLIN | POLLRDNORM;
L
Linus Torvalds 已提交
7184 7185 7186 7187
	if (sk->sk_shutdown == SHUTDOWN_MASK)
		mask |= POLLHUP;

	/* Is it readable?  Reconsider this code with TCP-style support.  */
E
Eric Dumazet 已提交
7188
	if (!skb_queue_empty(&sk->sk_receive_queue))
L
Linus Torvalds 已提交
7189 7190 7191 7192 7193 7194 7195 7196 7197 7198
		mask |= POLLIN | POLLRDNORM;

	/* The association is either gone or not ready.  */
	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
		return mask;

	/* Is it writable?  */
	if (sctp_writeable(sk)) {
		mask |= POLLOUT | POLLWRNORM;
	} else {
7199
		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
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
		/*
		 * Since the socket is not locked, the buffer
		 * might be made available after the writeable check and
		 * before the bit is set.  This could cause a lost I/O
		 * signal.  tcp_poll() has a race breaker for this race
		 * condition.  Based on their implementation, we put
		 * in the following code to cover it as well.
		 */
		if (sctp_writeable(sk))
			mask |= POLLOUT | POLLWRNORM;
	}
	return mask;
}

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

static struct sctp_bind_bucket *sctp_bucket_create(
7219
	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
L
Linus Torvalds 已提交
7220 7221 7222
{
	struct sctp_bind_bucket *pp;

7223
	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
L
Linus Torvalds 已提交
7224
	if (pp) {
7225
		SCTP_DBG_OBJCNT_INC(bind_bucket);
L
Linus Torvalds 已提交
7226 7227 7228
		pp->port = snum;
		pp->fastreuse = 0;
		INIT_HLIST_HEAD(&pp->owner);
7229
		pp->net = net;
7230
		hlist_add_head(&pp->node, &head->chain);
L
Linus Torvalds 已提交
7231 7232 7233 7234 7235 7236 7237
	}
	return pp;
}

/* Caller must hold hashbucket lock for this tb with local BH disabled */
static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
{
7238
	if (pp && hlist_empty(&pp->owner)) {
7239
		__hlist_del(&pp->node);
L
Linus Torvalds 已提交
7240 7241 7242 7243 7244 7245 7246 7247 7248
		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 =
7249 7250
		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
						  inet_sk(sk)->inet_num)];
L
Linus Torvalds 已提交
7251 7252
	struct sctp_bind_bucket *pp;

7253
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
7254 7255 7256
	pp = sctp_sk(sk)->bind_hash;
	__sk_del_bind_node(sk);
	sctp_sk(sk)->bind_hash = NULL;
E
Eric Dumazet 已提交
7257
	inet_sk(sk)->inet_num = 0;
L
Linus Torvalds 已提交
7258
	sctp_bucket_destroy(pp);
7259
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7260 7261 7262 7263
}

void sctp_put_port(struct sock *sk)
{
7264
	local_bh_disable();
L
Linus Torvalds 已提交
7265
	__sctp_put_port(sk);
7266
	local_bh_enable();
L
Linus Torvalds 已提交
7267 7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278
}

/*
 * 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
7279
	__be16 port;
L
Linus Torvalds 已提交
7280 7281 7282 7283

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

E
Eric Dumazet 已提交
7284
	port = htons(inet_sk(sk)->inet_num);
L
Linus Torvalds 已提交
7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299 7300 7301 7302 7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326 7327 7328
	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
 */
7329
static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
L
Linus Torvalds 已提交
7330 7331
{
	struct cmsghdr *cmsg;
7332
	struct msghdr *my_msg = (struct msghdr *)msg;
L
Linus Torvalds 已提交
7333

7334
	for_each_cmsghdr(cmsg, my_msg) {
7335
		if (!CMSG_OK(my_msg, cmsg))
L
Linus Torvalds 已提交
7336 7337 7338 7339 7340 7341 7342 7343 7344 7345
			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
7346
			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
L
Linus Torvalds 已提交
7347 7348 7349 7350 7351 7352 7353 7354 7355 7356 7357
			 *
			 * 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
			 */
7358
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
L
Linus Torvalds 已提交
7359
				return -EINVAL;
7360 7361

			cmsgs->init = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7362 7363 7364 7365
			break;

		case SCTP_SNDRCV:
			/* SCTP Socket API Extension
7366
			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
L
Linus Torvalds 已提交
7367 7368 7369 7370 7371 7372 7373 7374 7375
			 *
			 * 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
			 */
7376
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
L
Linus Torvalds 已提交
7377 7378
				return -EINVAL;

7379
			cmsgs->srinfo = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7380

7381
			if (cmsgs->srinfo->sinfo_flags &
7382
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
X
Xin Long 已提交
7383
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7384
			      SCTP_ABORT | SCTP_EOF))
L
Linus Torvalds 已提交
7385 7386 7387
				return -EINVAL;
			break;

7388 7389 7390 7391 7392 7393 7394 7395 7396 7397 7398 7399 7400 7401 7402 7403 7404 7405 7406
		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
7407
			      SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7408 7409 7410
			      SCTP_ABORT | SCTP_EOF))
				return -EINVAL;
			break;
L
Linus Torvalds 已提交
7411 7412
		default:
			return -EINVAL;
7413
		}
L
Linus Torvalds 已提交
7414
	}
7415

L
Linus Torvalds 已提交
7416 7417 7418 7419 7420 7421 7422 7423
	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.
 */
7424
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
L
Linus Torvalds 已提交
7425 7426 7427 7428
{
	int error;
	DEFINE_WAIT(wait);

E
Eric Dumazet 已提交
7429
	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7430 7431 7432 7433 7434 7435 7436 7437 7438 7439 7440 7441 7442 7443 7444 7445 7446 7447 7448 7449 7450 7451 7452 7453 7454 7455 7456 7457 7458 7459 7460

	/* 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.
	 */
7461
	release_sock(sk);
L
Linus Torvalds 已提交
7462
	*timeo_p = schedule_timeout(*timeo_p);
7463
	lock_sock(sk);
L
Linus Torvalds 已提交
7464 7465

ready:
E
Eric Dumazet 已提交
7466
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7467 7468 7469 7470 7471 7472
	return 0;

interrupted:
	error = sock_intr_errno(*timeo_p);

out:
E
Eric Dumazet 已提交
7473
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7474 7475 7476 7477 7478 7479 7480 7481
	*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.
 */
7482 7483
struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
				       int noblock, int *err)
L
Linus Torvalds 已提交
7484 7485 7486 7487 7488 7489 7490
{
	int error;
	struct sk_buff *skb;
	long timeo;

	timeo = sock_rcvtimeo(sk, noblock);

7491 7492
	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
		 MAX_SCHEDULE_TIMEOUT);
L
Linus Torvalds 已提交
7493 7494 7495 7496 7497 7498 7499

	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...
7500
		 *  However, this function was correct in any case. 8)
L
Linus Torvalds 已提交
7501 7502 7503 7504 7505 7506
		 */
		if (flags & MSG_PEEK) {
			skb = skb_peek(&sk->sk_receive_queue);
			if (skb)
				atomic_inc(&skb->users);
		} else {
7507
			skb = __skb_dequeue(&sk->sk_receive_queue);
L
Linus Torvalds 已提交
7508 7509 7510 7511 7512
		}

		if (skb)
			return skb;

7513 7514 7515 7516 7517
		/* 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
7518 7519 7520
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;

7521 7522 7523 7524 7525 7526
		if (sk_can_busy_loop(sk)) {
			sk_busy_loop(sk, noblock);

			if (!skb_queue_empty(&sk->sk_receive_queue))
				continue;
		}
7527

L
Linus Torvalds 已提交
7528 7529 7530 7531 7532 7533 7534 7535 7536 7537 7538 7539 7540 7541 7542 7543 7544 7545
		/* 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;

7546 7547 7548 7549 7550
	if (sctp_wspace(asoc) <= 0)
		return;

	if (waitqueue_active(&asoc->wait))
		wake_up_interruptible(&asoc->wait);
L
Linus Torvalds 已提交
7551

7552 7553
	if (sctp_writeable(sk)) {
		struct socket_wq *wq;
7554

7555 7556 7557 7558 7559
		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
7560 7561 7562 7563 7564

			/* 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.
			 */
7565
			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7566
				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
7567
		}
7568
		rcu_read_unlock();
L
Linus Torvalds 已提交
7569 7570 7571
	}
}

7572 7573 7574 7575 7576 7577 7578 7579 7580 7581 7582
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);

7583 7584 7585 7586 7587 7588
	/* If association goes down and is just flushing its
	 * outq, then just normally notify others.
	 */
	if (asoc->base.dead)
		return sctp_write_space(sk);

7589 7590 7591 7592 7593 7594 7595 7596 7597 7598 7599 7600 7601 7602 7603 7604 7605 7606 7607 7608 7609 7610 7611
	/* 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
7612 7613 7614 7615 7616 7617
/* 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)
{
7618 7619 7620
	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
7621

7622 7623 7624 7625 7626 7627
	asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

	atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);

7628
	/*
7629
	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7630 7631
	 */
	sk->sk_wmem_queued   -= skb->truesize;
7632
	sk_mem_uncharge(sk, skb->truesize);
7633

7634
	sock_wfree(skb);
7635
	sctp_wake_up_waiters(sk, asoc);
L
Linus Torvalds 已提交
7636 7637 7638 7639

	sctp_association_put(asoc);
}

7640 7641 7642 7643 7644 7645 7646 7647 7648 7649 7650
/* 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);
7651 7652

	/*
7653
	 * Mimic the behavior of sock_rfree
7654
	 */
7655
	sk_mem_uncharge(sk, event->rmem_len);
7656 7657 7658
}


L
Linus Torvalds 已提交
7659 7660 7661 7662 7663 7664 7665 7666 7667
/* Helper function to wait for space in the sndbuf.  */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
				size_t msg_len)
{
	struct sock *sk = asoc->base.sk;
	int err = 0;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);

7668 7669
	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
		 *timeo_p, msg_len);
L
Linus Torvalds 已提交
7670 7671 7672 7673 7674 7675 7676 7677 7678 7679 7680 7681 7682 7683 7684 7685 7686 7687 7688 7689 7690

	/* 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);
		if (!*timeo_p)
			goto do_nonblock;
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
		    asoc->base.dead)
			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.
		 */
7691
		release_sock(sk);
L
Linus Torvalds 已提交
7692
		current_timeo = schedule_timeout(current_timeo);
7693
		lock_sock(sk);
L
Linus Torvalds 已提交
7694 7695 7696 7697 7698 7699 7700 7701 7702 7703 7704 7705 7706 7707 7708 7709 7710 7711 7712 7713 7714 7715 7716 7717 7718

		*timeo_p = current_timeo;
	}

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

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

	return err;

do_error:
	err = -EPIPE;
	goto out;

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

do_nonblock:
	err = -EAGAIN;
	goto out;
}

7719
void sctp_data_ready(struct sock *sk)
7720
{
7721 7722 7723 7724
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
H
Herbert Xu 已提交
7725
	if (skwq_has_sleeper(wq))
7726
		wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7727 7728
						POLLRDNORM | POLLRDBAND);
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7729
	rcu_read_unlock();
7730 7731
}

L
Linus Torvalds 已提交
7732 7733 7734 7735 7736 7737
/* 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.  */
7738
	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
L
Linus Torvalds 已提交
7739 7740 7741 7742 7743 7744
		__sctp_write_space(asoc);
	}
}

/* Is there any sndbuf space available on the socket?
 *
7745
 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
L
Linus Torvalds 已提交
7746 7747 7748 7749 7750 7751 7752 7753 7754 7755 7756 7757
 * 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;

7758
	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
L
Linus Torvalds 已提交
7759 7760 7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772 7773
	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);

7774
	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
L
Linus Torvalds 已提交
7775 7776 7777 7778 7779 7780 7781 7782 7783 7784 7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795 7796 7797

	/* 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.
		 */
7798
		release_sock(sk);
L
Linus Torvalds 已提交
7799
		current_timeo = schedule_timeout(current_timeo);
7800
		lock_sock(sk);
L
Linus Torvalds 已提交
7801 7802 7803 7804 7805 7806 7807 7808 7809 7810 7811 7812 7813

		*timeo_p = current_timeo;
	}

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

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

	return err;

do_error:
7814
	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
L
Linus Torvalds 已提交
7815 7816 7817 7818 7819 7820 7821 7822 7823 7824 7825 7826 7827 7828 7829 7830 7831 7832 7833 7834 7835 7836 7837 7838
		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
7839
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
L
Linus Torvalds 已提交
7840 7841 7842
					  TASK_INTERRUPTIBLE);

		if (list_empty(&ep->asocs)) {
7843
			release_sock(sk);
L
Linus Torvalds 已提交
7844
			timeo = schedule_timeout(timeo);
7845
			lock_sock(sk);
L
Linus Torvalds 已提交
7846 7847 7848 7849 7850 7851 7852 7853 7854 7855 7856 7857 7858 7859 7860 7861 7862 7863 7864
		}

		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
7865
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7866 7867 7868 7869

	return err;
}

7870
static void sctp_wait_for_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
7871 7872 7873 7874
{
	DEFINE_WAIT(wait);

	do {
E
Eric Dumazet 已提交
7875
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7876 7877
		if (list_empty(&sctp_sk(sk)->ep->asocs))
			break;
7878
		release_sock(sk);
L
Linus Torvalds 已提交
7879
		timeout = schedule_timeout(timeout);
7880
		lock_sock(sk);
L
Linus Torvalds 已提交
7881 7882
	} while (!signal_pending(current) && timeout);

E
Eric Dumazet 已提交
7883
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7884 7885
}

7886 7887 7888 7889 7890 7891 7892 7893
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. */
7894
	skb_walk_frags(skb, frag)
7895 7896 7897 7898 7899 7900
		sctp_skb_set_owner_r_frag(frag, sk);

done:
	sctp_skb_set_owner_r(skb, sk);
}

7901 7902 7903 7904
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
7905
	struct inet_sock *newinet;
7906 7907 7908 7909

	newsk->sk_type = sk->sk_type;
	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
	newsk->sk_flags = sk->sk_flags;
7910
	newsk->sk_tsflags = sk->sk_tsflags;
7911 7912
	newsk->sk_no_check_tx = sk->sk_no_check_tx;
	newsk->sk_no_check_rx = sk->sk_no_check_rx;
7913 7914 7915
	newsk->sk_reuse = sk->sk_reuse;

	newsk->sk_shutdown = sk->sk_shutdown;
7916
	newsk->sk_destruct = sctp_destruct_sock;
7917 7918 7919 7920 7921 7922 7923 7924
	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;
7925
	newsk->sk_rxhash = sk->sk_rxhash;
7926 7927 7928 7929 7930 7931

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
E
Eric Dumazet 已提交
7932 7933 7934 7935
	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);
7936
	newinet->pmtudisc = inet->pmtudisc;
E
Eric Dumazet 已提交
7937
	newinet->inet_id = asoc->next_tsn ^ jiffies;
7938 7939 7940 7941 7942 7943

	newinet->uc_ttl = inet->uc_ttl;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;
7944 7945 7946

	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
		net_enable_timestamp();
7947 7948

	security_sk_clone(sk, newsk);
7949 7950
}

7951 7952 7953 7954 7955 7956 7957 7958 7959 7960 7961 7962 7963
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
7964 7965 7966 7967 7968 7969 7970 7971 7972 7973 7974 7975 7976
/* 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,
			      sctp_socket_type_t type)
{
	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;
7977
	struct sctp_bind_hashbucket *head;
L
Linus Torvalds 已提交
7978 7979 7980 7981 7982 7983 7984

	/* 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. */
7985
	sctp_copy_descendant(newsk, oldsk);
L
Linus Torvalds 已提交
7986 7987 7988 7989 7990 7991 7992 7993

	/* 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. */
7994 7995
	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
						 inet_sk(oldsk)->inet_num)];
7996
	spin_lock_bh(&head->lock);
L
Linus Torvalds 已提交
7997 7998 7999
	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
8000
	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8001
	spin_unlock_bh(&head->lock);
L
Linus Torvalds 已提交
8002

8003 8004 8005
	/* Copy the bind_addr list from the original endpoint to the new
	 * endpoint so that we can handle restarts properly
	 */
8006 8007
	sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
				&oldsp->ep->base.bind_addr, GFP_KERNEL);
8008

L
Linus Torvalds 已提交
8009 8010 8011 8012 8013 8014
	/* 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
8015
			__skb_unlink(skb, &oldsk->sk_receive_queue);
L
Linus Torvalds 已提交
8016
			__skb_queue_tail(&newsk->sk_receive_queue, skb);
8017
			sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8018 8019 8020 8021 8022 8023 8024 8025 8026 8027
		}
	}

	/* 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);
8028
	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
L
Linus Torvalds 已提交
8029

8030
	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
L
Linus Torvalds 已提交
8031 8032 8033 8034 8035 8036 8037 8038 8039 8040 8041 8042 8043 8044
		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
8045
				__skb_unlink(skb, &oldsp->pd_lobby);
L
Linus Torvalds 已提交
8046
				__skb_queue_tail(queue, skb);
8047
				sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8048 8049 8050 8051 8052 8053 8054
			}
		}

		/* Clear up any skbs waiting for the partial
		 * delivery to finish.
		 */
		if (assoc->ulpq.pd_mode)
8055
			sctp_clear_pd(oldsk, NULL);
L
Linus Torvalds 已提交
8056 8057 8058

	}

8059
	sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
8060 8061
		sctp_skb_set_owner_r_frag(skb, newsk);

8062
	sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
8063 8064
		sctp_skb_set_owner_r_frag(skb, newsk);

L
Linus Torvalds 已提交
8065 8066 8067 8068 8069 8070
	/* 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;

8071 8072 8073 8074 8075
	/* 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.
8076 8077 8078
	 *
	 * The caller has just allocated newsk so we can guarantee that other
	 * paths won't try to lock it and then oldsk.
8079
	 */
8080
	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
8081 8082 8083 8084 8085
	sctp_assoc_migrate(assoc, newsk);

	/* If the association on the newsk is already closed before accept()
	 * is called, set RCV_SHUTDOWN flag.
	 */
8086
	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8087
		newsk->sk_state = SCTP_SS_CLOSED;
L
Linus Torvalds 已提交
8088
		newsk->sk_shutdown |= RCV_SHUTDOWN;
8089 8090 8091
	} else {
		newsk->sk_state = SCTP_SS_ESTABLISHED;
	}
L
Linus Torvalds 已提交
8092

8093
	release_sock(newsk);
L
Linus Torvalds 已提交
8094 8095
}

8096

L
Linus Torvalds 已提交
8097 8098 8099 8100 8101 8102 8103 8104 8105 8106 8107 8108 8109 8110 8111 8112 8113 8114 8115 8116 8117 8118
/* 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),
8119 8120 8121 8122 8123 8124
	.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,
8125
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8126 8127
};

E
Eric Dumazet 已提交
8128
#if IS_ENABLED(CONFIG_IPV6)
8129

8130 8131 8132 8133 8134 8135 8136
#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
8137 8138 8139 8140 8141 8142 8143 8144 8145
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,
8146
	.destroy	= sctp_v6_destroy_sock,
L
Linus Torvalds 已提交
8147 8148 8149 8150 8151 8152 8153 8154 8155 8156 8157
	.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),
8158 8159 8160 8161 8162 8163
	.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,
8164
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8165
};
E
Eric Dumazet 已提交
8166
#endif /* IS_ENABLED(CONFIG_IPV6) */