socket.c 207.7 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 <linux/types.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/time.h>
#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>
#include <linux/crypto.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.
		 */
		if (!sctp_sstate(sk, ESTABLISHED))
			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;
	struct sctp_transport *transport;
	union sctp_addr *laddr = (union sctp_addr *)addr;

	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 < PROT_SOCK &&
	    !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, 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
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		 * in the bind address list of the association. If so,
		 * do not send the asconf chunk to its peer, but continue with
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		 * other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
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			addr = addr_buf;
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			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;

558 559
		/* Use the first valid address in bind addr list of
		 * association as Address Parameter of ASCONF CHUNK.
L
Linus Torvalds 已提交
560 561 562 563
		 */
		bp = &asoc->base.bind_addr;
		p = bp->address_list.next;
		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
564
		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
L
Linus Torvalds 已提交
565 566 567 568 569 570
						   addrcnt, SCTP_PARAM_ADD_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

571 572
		/* Add the new addresses to the bind address list with
		 * use_as_src set to 0.
L
Linus Torvalds 已提交
573
		 */
574 575
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
576
			addr = addr_buf;
577 578
			af = sctp_get_af_specific(addr->v4.sin_family);
			memcpy(&saveaddr, addr, af->sockaddr_len);
579 580
			retval = sctp_add_bind_addr(bp, &saveaddr,
						    SCTP_ADDR_NEW, GFP_ATOMIC);
581 582
			addr_buf += af->sockaddr_len;
		}
583 584 585 586 587 588 589 590 591 592 593
		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 */
				dst_release(trans->dst);
				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;
594
				sctp_max_rto(asoc, trans);
595 596 597 598 599 600
				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
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
	}

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.
 */
622
static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
L
Linus Torvalds 已提交
623 624 625 626 627 628 629
{
	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;
630
	union sctp_addr *sa_addr;
L
Linus Torvalds 已提交
631 632
	struct sctp_af *af;

633 634
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
635 636 637 638 639 640 641 642 643 644 645 646 647

	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
648
		sa_addr = addr_buf;
649
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
L
Linus Torvalds 已提交
650 651 652 653
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_rem;
		}
654 655 656 657 658 659

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

660 661
		if (sa_addr->v4.sin_port &&
		    sa_addr->v4.sin_port != htons(bp->port)) {
L
Linus Torvalds 已提交
662 663 664 665
			retval = -EINVAL;
			goto err_bindx_rem;
		}

666 667 668
		if (!sa_addr->v4.sin_port)
			sa_addr->v4.sin_port = htons(bp->port);

L
Linus Torvalds 已提交
669 670 671 672 673 674 675
		/* 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
		 */
676
		retval = sctp_del_bind_addr(bp, sa_addr);
L
Linus Torvalds 已提交
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694

		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.
 *
695
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
696 697 698 699 700 701 702 703 704
 * 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)
{
705
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
706 707 708
	struct sctp_sock	*sp;
	struct sctp_endpoint	*ep;
	struct sctp_association	*asoc;
709
	struct sctp_transport	*transport;
L
Linus Torvalds 已提交
710 711 712 713 714
	struct sctp_bind_addr	*bp;
	struct sctp_chunk	*chunk;
	union sctp_addr		*laddr;
	void			*addr_buf;
	struct sctp_af		*af;
715
	struct sctp_sockaddr_entry *saddr;
L
Linus Torvalds 已提交
716 717
	int 			i;
	int 			retval = 0;
718
	int			stored = 0;
L
Linus Torvalds 已提交
719

720
	chunk = NULL;
721
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
722 723 724 725 726
		return retval;

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

727 728
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
729

730
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
731 732 733 734 735 736 737 738 739 740 741

		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
742
		 * not present in the bind address list of the association.
L
Linus Torvalds 已提交
743 744 745 746 747
		 * 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
748
			laddr = addr_buf;
L
Linus Torvalds 已提交
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
			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);
771 772 773 774 775
		if ((laddr == NULL) && (addrcnt == 1)) {
			if (asoc->asconf_addr_del_pending)
				continue;
			asoc->asconf_addr_del_pending =
			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
776 777 778 779
			if (asoc->asconf_addr_del_pending == NULL) {
				retval = -ENOMEM;
				goto out;
			}
780 781 782 783 784 785 786 787 788 789 790 791 792
			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
793
				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
794
			}
795 796 797 798 799

			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);

800 801 802 803
			asoc->src_out_of_asoc_ok = 1;
			stored = 1;
			goto skip_mkasconf;
		}
L
Linus Torvalds 已提交
804

805 806 807
		if (laddr == NULL)
			return -EINVAL;

808 809 810 811
		/* 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
812 813 814 815 816 817 818
		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
						   SCTP_PARAM_DEL_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

819
skip_mkasconf:
820 821 822 823 824
		/* 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
825
			laddr = addr_buf;
826
			af = sctp_get_af_specific(laddr->v4.sin_family);
827
			list_for_each_entry(saddr, &bp->address_list, list) {
828
				if (sctp_cmp_addr_exact(&saddr->a, laddr))
829
					saddr->state = SCTP_ADDR_DEL;
830 831 832
			}
			addr_buf += af->sockaddr_len;
		}
L
Linus Torvalds 已提交
833

834 835 836
		/* 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
837
		 */
838 839
		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
					transports) {
840 841 842 843 844
			dst_release(transport->dst);
			sctp_transport_route(transport, NULL,
					     sctp_sk(asoc->base.sk));
		}

845 846 847
		if (stored)
			/* We don't need to transmit ASCONF */
			continue;
848
		retval = sctp_send_asconf(asoc, chunk);
L
Linus Torvalds 已提交
849 850 851 852 853
	}
out:
	return retval;
}

854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
/* 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
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
/* 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
892
 * must be used to distinguish the address length (note that this
L
Linus Torvalds 已提交
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
 * 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
931 932
 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 * from userspace.
L
Linus Torvalds 已提交
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
 *
 * 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.
 */
952
static int sctp_setsockopt_bindx(struct sock *sk,
953 954
				 struct sockaddr __user *addrs,
				 int addrs_size, int op)
L
Linus Torvalds 已提交
955 956 957 958 959 960 961 962 963
{
	struct sockaddr *kaddrs;
	int err;
	int addrcnt = 0;
	int walk_size = 0;
	struct sockaddr *sa_addr;
	void *addr_buf;
	struct sctp_af *af;

964 965
	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
966 967 968 969 970 971 972 973 974

	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.  */
975
	kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
L
Linus Torvalds 已提交
976 977 978 979 980 981 982 983
	if (unlikely(!kaddrs))
		return -ENOMEM;

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

984
	/* Walk through the addrs buffer and count the number of addresses. */
L
Linus Torvalds 已提交
985 986
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
987 988 989 990 991
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			kfree(kaddrs);
			return -EINVAL;
		}

J
Joe Perches 已提交
992
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
993 994 995 996
		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.
997
		 */
L
Linus Torvalds 已提交
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
		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;
1026
	}
L
Linus Torvalds 已提交
1027 1028 1029 1030 1031 1032 1033

out:
	kfree(kaddrs);

	return err;
}

F
Frank Filz 已提交
1034 1035 1036 1037 1038
/* __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.
 */
1039
static int __sctp_connect(struct sock *sk,
F
Frank Filz 已提交
1040
			  struct sockaddr *kaddrs,
1041 1042
			  int addrs_size,
			  sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1043
{
1044
	struct net *net = sock_net(sk);
F
Frank Filz 已提交
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
	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;
1056
	union sctp_addr *sa_addr = NULL;
F
Frank Filz 已提交
1057
	void *addr_buf;
1058
	unsigned short port;
1059
	unsigned int f_flags = 0;
F
Frank Filz 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077

	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.
	 */
	if (sctp_sstate(sk, ESTABLISHED) ||
	    (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) {
1078 1079
		struct sctp_af *af;

1080 1081 1082 1083 1084
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

J
Joe Perches 已提交
1085
		sa_addr = addr_buf;
1086
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
F
Frank Filz 已提交
1087 1088 1089 1090 1091 1092 1093 1094 1095

		/* 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;
		}

1096 1097
		port = ntohs(sa_addr->v4.sin_port);

1098 1099 1100 1101
		/* 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
1102 1103 1104
		if (err)
			goto out_free;

1105 1106 1107
		/* Make sure the destination port is correctly set
		 * in all addresses.
		 */
1108 1109
		if (asoc && asoc->peer.port && asoc->peer.port != port) {
			err = -EINVAL;
1110
			goto out_free;
1111
		}
F
Frank Filz 已提交
1112 1113 1114 1115

		/* Check if there already is a matching association on the
		 * endpoint (other than the one created here).
		 */
1116
		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
F
Frank Filz 已提交
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
		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.
		 */
1129
		if (sctp_endpoint_is_peeled_off(ep, &to)) {
F
Frank Filz 已提交
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
			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;
				}
1145 1146
			} else {
				/*
1147 1148 1149 1150
				 * 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
1151 1152 1153
				 * be permitted to open new associations.
				 */
				if (ep->base.bind_addr.port < PROT_SOCK &&
1154
				    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1155 1156 1157
					err = -EACCES;
					goto out_free;
				}
F
Frank Filz 已提交
1158 1159
			}

1160
			scope = sctp_scope(&to);
F
Frank Filz 已提交
1161 1162 1163 1164 1165
			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
			if (!asoc) {
				err = -ENOMEM;
				goto out_free;
			}
1166 1167 1168 1169 1170 1171 1172

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

F
Frank Filz 已提交
1173 1174 1175
		}

		/* Prime the peer's transport structures.  */
1176
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
F
Frank Filz 已提交
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}

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

1188 1189 1190 1191 1192 1193 1194 1195 1196
	/* 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;
	}

1197
	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
F
Frank Filz 已提交
1198 1199 1200 1201 1202
	if (err < 0) {
		goto out_free;
	}

	/* Initialize sk's dport and daddr for getpeername() */
E
Eric Dumazet 已提交
1203
	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1204
	sp->pf->to_sk_daddr(sa_addr, sk);
1205
	sk->sk_err = 0;
F
Frank Filz 已提交
1206

1207 1208 1209 1210 1211 1212 1213 1214
	/* 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);

F
Frank Filz 已提交
1215
	err = sctp_wait_for_connect(asoc, &timeo);
1216
	if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1217
		*assoc_id = asoc->assoc_id;
F
Frank Filz 已提交
1218 1219 1220 1221 1222

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

out_free:
1223 1224
	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
1225

1226 1227 1228 1229 1230 1231
	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
		 */
		sctp_unhash_established(asoc);
F
Frank Filz 已提交
1232
		sctp_association_free(asoc);
1233
	}
F
Frank Filz 已提交
1234 1235 1236 1237 1238 1239
	return err;
}

/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
 *
 * API 8.9
1240 1241
 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
 * 			sctp_assoc_t *asoc);
F
Frank Filz 已提交
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
 *
 * 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.
 *
1257 1258 1259 1260
 * 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
1261 1262 1263 1264 1265 1266 1267 1268
 *
 * 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
1269
 * the association is implementation dependent.  This function only
F
Frank Filz 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
 * 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
 *
1297
 * Returns >=0 if ok, <0 errno code on error.
F
Frank Filz 已提交
1298
 */
1299
static int __sctp_setsockopt_connectx(struct sock *sk,
F
Frank Filz 已提交
1300
				      struct sockaddr __user *addrs,
1301 1302
				      int addrs_size,
				      sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1303 1304 1305 1306
{
	int err = 0;
	struct sockaddr *kaddrs;

1307 1308
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
		 __func__, sk, addrs, addrs_size);
F
Frank Filz 已提交
1309 1310 1311 1312 1313 1314 1315 1316 1317

	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.  */
1318
	kaddrs = kmalloc(addrs_size, GFP_KERNEL);
F
Frank Filz 已提交
1319 1320 1321 1322 1323 1324
	if (unlikely(!kaddrs))
		return -ENOMEM;

	if (__copy_from_user(kaddrs, addrs, addrs_size)) {
		err = -EFAULT;
	} else {
1325
		err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
F
Frank Filz 已提交
1326 1327 1328
	}

	kfree(kaddrs);
1329

F
Frank Filz 已提交
1330 1331 1332
	return err;
}

1333 1334 1335 1336
/*
 * This is an older interface.  It's kept for backward compatibility
 * to the option that doesn't provide association id.
 */
1337
static int sctp_setsockopt_connectx_old(struct sock *sk,
1338 1339
					struct sockaddr __user *addrs,
					int addrs_size)
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
{
	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.
 */
1350
static int sctp_setsockopt_connectx(struct sock *sk,
1351 1352
				    struct sockaddr __user *addrs,
				    int addrs_size)
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
{
	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;
}

1365
/*
1366 1367
 * New (hopefully final) interface for the API.
 * We use the sctp_getaddrs_old structure so that use-space library
1368
 * can avoid any unnecessary allocations. The only different part
1369
 * is that we store the actual length of the address buffer into the
1370
 * addrs_num structure member. That way we can re-use the existing
1371
 * code.
1372
 */
1373 1374 1375 1376 1377 1378 1379 1380
#ifdef CONFIG_COMPAT
struct compat_sctp_getaddrs_old {
	sctp_assoc_t	assoc_id;
	s32		addr_num;
	compat_uptr_t	addrs;		/* struct sockaddr * */
};
#endif

1381
static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1382 1383
				     char __user *optval,
				     int __user *optlen)
1384
{
1385
	struct sctp_getaddrs_old param;
1386 1387 1388
	sctp_assoc_t assoc_id = 0;
	int err = 0;

1389 1390 1391
#ifdef CONFIG_COMPAT
	if (is_compat_task()) {
		struct compat_sctp_getaddrs_old param32;
1392

1393 1394 1395 1396
		if (len < sizeof(param32))
			return -EINVAL;
		if (copy_from_user(&param32, optval, sizeof(param32)))
			return -EFAULT;
1397

1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
		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;
	}
1409

1410 1411 1412
	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
					 param.addrs, param.addr_num,
					 &assoc_id);
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
	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
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 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
/* 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.
 */
1473
static void sctp_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
1474
{
1475
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1476 1477 1478
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;
	struct list_head *pos, *temp;
1479
	unsigned int data_was_unread;
L
Linus Torvalds 已提交
1480

1481
	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
L
Linus Torvalds 已提交
1482

1483
	lock_sock(sk);
L
Linus Torvalds 已提交
1484
	sk->sk_shutdown = SHUTDOWN_MASK;
1485
	sk->sk_state = SCTP_SS_CLOSING;
L
Linus Torvalds 已提交
1486 1487 1488

	ep = sctp_sk(sk)->ep;

1489 1490 1491 1492
	/* 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);

1493
	/* Walk all associations on an endpoint.  */
L
Linus Torvalds 已提交
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	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_unhash_established(asoc);
				sctp_association_free(asoc);
1506 1507 1508
				continue;
			}
		}
L
Linus Torvalds 已提交
1509

1510 1511 1512
		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
		    !skb_queue_empty(&asoc->ulpq.reasm) ||
		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1513 1514 1515 1516
			struct sctp_chunk *chunk;

			chunk = sctp_make_abort_user(asoc, NULL, 0);
			if (chunk)
1517
				sctp_primitive_ABORT(net, asoc, chunk);
1518
		} else
1519
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1520 1521 1522 1523 1524 1525 1526
	}

	/* 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.  */
1527
	release_sock(sk);
L
Linus Torvalds 已提交
1528 1529 1530

	/* Supposedly, no process has access to the socket, but
	 * the net layers still may.
1531 1532
	 * 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
1533
	 */
1534
	spin_lock_bh(&net->sctp.addr_wq_lock);
1535
	bh_lock_sock(sk);
L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542

	/* 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);

1543
	bh_unlock_sock(sk);
1544
	spin_unlock_bh(&net->sctp.addr_wq_lock);
L
Linus Torvalds 已提交
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 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

	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(). */

1584
static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
L
Linus Torvalds 已提交
1585

1586
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
L
Linus Torvalds 已提交
1587
{
1588
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1589 1590
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
1591
	struct sctp_association *new_asoc = NULL, *asoc = NULL;
L
Linus Torvalds 已提交
1592 1593
	struct sctp_transport *transport, *chunk_tp;
	struct sctp_chunk *chunk;
1594
	union sctp_addr to;
L
Linus Torvalds 已提交
1595
	struct sockaddr *msg_name = NULL;
1596
	struct sctp_sndrcvinfo default_sinfo;
L
Linus Torvalds 已提交
1597 1598 1599 1600 1601
	struct sctp_sndrcvinfo *sinfo;
	struct sctp_initmsg *sinit;
	sctp_assoc_t associd = 0;
	sctp_cmsgs_t cmsgs = { NULL };
	sctp_scope_t scope;
1602
	bool fill_sinfo_ttl = false, wait_connect = false;
L
Linus Torvalds 已提交
1603 1604
	struct sctp_datamsg *datamsg;
	int msg_flags = msg->msg_flags;
1605 1606 1607
	__u16 sinfo_flags = 0;
	long timeo;
	int err;
L
Linus Torvalds 已提交
1608 1609 1610 1611 1612

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

1613 1614
	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
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624

	/* 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) {
1625
		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
L
Linus Torvalds 已提交
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
		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;
1649 1650 1651 1652 1653 1654 1655
	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
1656

1657 1658 1659 1660 1661 1662
		sinfo = &default_sinfo;
		fill_sinfo_ttl = true;
	} else {
		sinfo = cmsgs.srinfo;
	}
	/* Did the user specify SNDINFO/SNDRCVINFO? */
L
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1663 1664 1665 1666 1667
	if (sinfo) {
		sinfo_flags = sinfo->sinfo_flags;
		associd = sinfo->sinfo_assoc_id;
	}

1668 1669
	pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
		 msg_len, sinfo_flags);
L
Linus Torvalds 已提交
1670

1671 1672
	/* 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
1673 1674 1675 1676
		err = -EINVAL;
		goto out_nounlock;
	}

1677 1678 1679
	/* 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
1680
	 * the msg_iov set to the user abort reason.
1681
	 */
1682 1683
	if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
	    (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
L
Linus Torvalds 已提交
1684 1685 1686 1687
		err = -EINVAL;
		goto out_nounlock;
	}

1688
	/* If SCTP_ADDR_OVER is set, there must be an address
L
Linus Torvalds 已提交
1689 1690
	 * specified in msg_name.
	 */
1691
	if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
L
Linus Torvalds 已提交
1692 1693 1694 1695 1696 1697
		err = -EINVAL;
		goto out_nounlock;
	}

	transport = NULL;

1698
	pr_debug("%s: about to look up association\n", __func__);
L
Linus Torvalds 已提交
1699

1700
	lock_sock(sk);
L
Linus Torvalds 已提交
1701 1702 1703 1704

	/* If a msg_name has been specified, assume this is to be used.  */
	if (msg_name) {
		/* Look for a matching association on the endpoint. */
1705
		asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
L
Linus Torvalds 已提交
1706 1707 1708 1709 1710 1711 1712 1713
		if (!asoc) {
			/* 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 ((sctp_style(sk, TCP) &&
			     sctp_sstate(sk, ESTABLISHED)) ||
1714
			    sctp_endpoint_is_peeled_off(ep, &to)) {
L
Linus Torvalds 已提交
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
				err = -EADDRNOTAVAIL;
				goto out_unlock;
			}
		}
	} else {
		asoc = sctp_id2assoc(sk, associd);
		if (!asoc) {
			err = -EPIPE;
			goto out_unlock;
		}
	}

	if (asoc) {
1728
		pr_debug("%s: just looked up association:%p\n", __func__, asoc);
L
Linus Torvalds 已提交
1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739

		/* 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;
		}

1740
		if (sinfo_flags & SCTP_EOF) {
1741 1742 1743
			pr_debug("%s: shutting down association:%p\n",
				 __func__, asoc);

1744
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1745 1746 1747
			err = 0;
			goto out_unlock;
		}
1748
		if (sinfo_flags & SCTP_ABORT) {
1749 1750 1751 1752 1753 1754 1755

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

1756 1757 1758
			pr_debug("%s: aborting association:%p\n",
				 __func__, asoc);

1759
			sctp_primitive_ABORT(net, asoc, chunk);
L
Linus Torvalds 已提交
1760 1761 1762 1763 1764 1765 1766
			err = 0;
			goto out_unlock;
		}
	}

	/* Do we need to create the association?  */
	if (!asoc) {
1767
		pr_debug("%s: there is no association yet\n", __func__);
L
Linus Torvalds 已提交
1768

1769
		if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
L
Linus Torvalds 已提交
1770 1771 1772 1773 1774 1775 1776 1777
			err = -EINVAL;
			goto out_unlock;
		}

		/* Check for invalid stream against the stream counts,
		 * either the default or the user specified stream counts.
		 */
		if (sinfo) {
1778
			if (!sinit || !sinit->sinit_num_ostreams) {
L
Linus Torvalds 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
				/* 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;
			}
1807 1808 1809 1810 1811 1812 1813 1814 1815
		} 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.
			 */
			if (ep->base.bind_addr.port < PROT_SOCK &&
1816
			    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1817 1818 1819
				err = -EACCES;
				goto out_unlock;
			}
L
Linus Torvalds 已提交
1820 1821 1822 1823 1824 1825 1826 1827 1828
		}

		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;
1829 1830 1831 1832 1833
		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
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851

		/* 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) {
1852
				asoc->max_init_timeo =
L
Linus Torvalds 已提交
1853 1854 1855 1856 1857
				 msecs_to_jiffies(sinit->sinit_max_init_timeo);
			}
		}

		/* Prime the peer's transport structures.  */
1858
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
L
Linus Torvalds 已提交
1859 1860 1861 1862 1863 1864 1865
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}
	}

	/* ASSERT: we have a valid association at this point.  */
1866
	pr_debug("%s: we have a valid association\n", __func__);
L
Linus Torvalds 已提交
1867 1868

	if (!sinfo) {
1869 1870
		/* If the user didn't specify SNDINFO/SNDRCVINFO, make up
		 * one with some defaults.
L
Linus Torvalds 已提交
1871
		 */
1872
		memset(&default_sinfo, 0, sizeof(default_sinfo));
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878
		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);
1879

L
Linus Torvalds 已提交
1880
		sinfo = &default_sinfo;
1881 1882 1883 1884 1885
	} 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
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
	}

	/* 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;
	}

1896
	if (asoc->pmtu_pending)
1897
		sctp_assoc_pending_pmtu(sk, asoc);
1898

L
Linus Torvalds 已提交
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
	/* 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;
	}

1909 1910 1911 1912
	/* Check for invalid stream. */
	if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
		err = -EINVAL;
		goto out_free;
L
Linus Torvalds 已提交
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
	}

	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
1924
	 * when SCTP_ADDR_OVER flag is set in the UDP model.
L
Linus Torvalds 已提交
1925 1926
	 */
	if ((sctp_style(sk, TCP) && msg_name) ||
1927
	    (sinfo_flags & SCTP_ADDR_OVER)) {
1928
		chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
L
Linus Torvalds 已提交
1929 1930 1931 1932 1933 1934 1935 1936 1937
		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)) {
1938
		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
L
Linus Torvalds 已提交
1939 1940
		if (err < 0)
			goto out_free;
1941

1942
		wait_connect = true;
1943
		pr_debug("%s: we associated primitively\n", __func__);
L
Linus Torvalds 已提交
1944 1945 1946
	}

	/* Break the message into multiple chunks of maximum size. */
A
Al Viro 已提交
1947
	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1948 1949
	if (IS_ERR(datamsg)) {
		err = PTR_ERR(datamsg);
L
Linus Torvalds 已提交
1950 1951 1952 1953
		goto out_free;
	}

	/* Now send the (possibly) fragmented message. */
1954
	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
L
Linus Torvalds 已提交
1955 1956 1957 1958 1959 1960
		/* Do accounting for the write space.  */
		sctp_set_owner_w(chunk);

		chunk->transport = chunk_tp;
	}

1961 1962 1963 1964 1965
	/* 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.
	 */
1966
	err = sctp_primitive_SEND(net, asoc, datamsg);
1967
	sctp_datamsg_put(datamsg);
1968
	/* Did the lower layer accept the chunk? */
1969
	if (err)
1970
		goto out_free;
1971

1972
	pr_debug("%s: we sent primitively\n", __func__);
1973

1974
	err = msg_len;
L
Linus Torvalds 已提交
1975

1976 1977 1978 1979 1980
	if (unlikely(wait_connect)) {
		timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
		sctp_wait_for_connect(asoc, &timeo);
	}

L
Linus Torvalds 已提交
1981 1982 1983 1984 1985 1986
	/* If we are already past ASSOCIATE, the lower
	 * layers are responsible for association cleanup.
	 */
	goto out_unlock;

out_free:
1987 1988
	if (new_asoc) {
		sctp_unhash_established(asoc);
L
Linus Torvalds 已提交
1989
		sctp_association_free(asoc);
1990
	}
L
Linus Torvalds 已提交
1991
out_unlock:
1992
	release_sock(sk);
L
Linus Torvalds 已提交
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031

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);

2032
	skb_walk_frags(skb, list) {
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
		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.
 */
2061 2062
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
2063 2064 2065 2066 2067 2068 2069 2070
{
	struct sctp_ulpevent *event = NULL;
	struct sctp_sock *sp = sctp_sk(sk);
	struct sk_buff *skb;
	int copied;
	int err = 0;
	int skb_len;

2071 2072 2073
	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
2074

2075
	lock_sock(sk);
L
Linus Torvalds 已提交
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094

	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
		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;

2095
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
Linus Torvalds 已提交
2096 2097 2098 2099 2100 2101

	event = sctp_skb2event(skb);

	if (err)
		goto out_free;

2102
	sock_recv_ts_and_drops(msg, sk, skb);
L
Linus Torvalds 已提交
2103 2104 2105 2106 2107 2108 2109
	if (sctp_ulpevent_is_notification(event)) {
		msg->msg_flags |= MSG_NOTIFICATION;
		sp->pf->event_msgname(event, msg->msg_name, addr_len);
	} else {
		sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
	}

2110 2111 2112
	/* Check if we allow SCTP_NXTINFO. */
	if (sp->recvnxtinfo)
		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2113 2114 2115
	/* Check if we allow SCTP_RCVINFO. */
	if (sp->recvrcvinfo)
		sctp_ulpevent_read_rcvinfo(event, msg);
L
Linus Torvalds 已提交
2116 2117 2118
	/* Check if we allow SCTP_SNDRCVINFO. */
	if (sp->subscribe.sctp_data_io_event)
		sctp_ulpevent_read_sndrcvinfo(event, msg);
2119

L
Linus Torvalds 已提交
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
	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);

2133 2134 2135 2136 2137 2138
		/* 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
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
		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:
2160
	release_sock(sk);
L
Linus Torvalds 已提交
2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171
	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,
2172 2173
					     char __user *optval,
					     unsigned int optlen)
L
Linus Torvalds 已提交
2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
{
	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,
2189
				  unsigned int optlen)
L
Linus Torvalds 已提交
2190
{
2191 2192 2193
	struct sctp_association *asoc;
	struct sctp_ulpevent *event;

2194
	if (optlen > sizeof(struct sctp_event_subscribe))
L
Linus Torvalds 已提交
2195 2196 2197
		return -EINVAL;
	if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
		return -EFAULT;
2198

2199
	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
	 * 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
2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231
	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,
2232
				     unsigned int optlen)
L
Linus Torvalds 已提交
2233 2234
{
	struct sctp_sock *sp = sctp_sk(sk);
2235
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2236 2237 2238 2239 2240 2241 2242 2243 2244

	/* 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;

2245 2246 2247
	if (sp->autoclose > net->sctp.max_autoclose)
		sp->autoclose = net->sctp.max_autoclose;

L
Linus Torvalds 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
	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 {
2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
 *     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
2273 2274
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2275 2276 2277
 *                     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
2278 2279
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
 *                     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.
 *
2318 2319 2320 2321
 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
 *                     heartbeat delayis to be set to the value of 0
 *                     milliseconds.
 *
2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
 *                     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
2347
 */
A
Adrian Bunk 已提交
2348 2349 2350 2351 2352 2353 2354
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)
2355 2356 2357 2358
{
	int error;

	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2359 2360 2361
		struct net *net = sock_net(trans->asoc->base.sk);

		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2362 2363 2364 2365
		if (error)
			return error;
	}

2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
	/* 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;
			}
2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405
		}
	}

	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;
		}
	}

2406 2407 2408 2409 2410 2411
	/* 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) {
2412 2413
		if (trans) {
			trans->pathmtu = params->spp_pathmtu;
2414
			sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2415 2416
		} else if (asoc) {
			asoc->pathmtu = params->spp_pathmtu;
2417
			sctp_frag_point(asoc, params->spp_pathmtu);
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
		} 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) {
2430
				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2431
				sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441
			}
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
		}
	}

2442 2443 2444 2445 2446
	/* 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) {
2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473
		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;
		}
	}

2474 2475
	/* Note that a value of zero indicates the current setting should be
	   left unchanged.
2476
	 */
2477
	if (params->spp_pathmaxrxt) {
2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489
		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
2490
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2491 2492
					    char __user *optval,
					    unsigned int optlen)
L
Linus Torvalds 已提交
2493
{
2494 2495 2496 2497
	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
2498
	int error;
2499
	int hb_change, pmtud_change, sackdelay_change;
L
Linus Torvalds 已提交
2500 2501

	if (optlen != sizeof(struct sctp_paddrparams))
2502
		return -EINVAL;
2503

L
Linus Torvalds 已提交
2504 2505 2506
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

2507 2508 2509 2510 2511 2512 2513 2514 2515
	/* 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 ||
2516 2517
	    (params.spp_pathmtu &&
	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2518
		return -EINVAL;
L
Linus Torvalds 已提交
2519

2520 2521 2522
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
	 */
2523
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2524 2525 2526
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans)
L
Linus Torvalds 已提交
2527 2528 2529
			return -EINVAL;
	}

2530 2531 2532 2533 2534 2535
	/* 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
2536 2537
		return -EINVAL;

2538 2539
	/* Heartbeat demand can only be sent on a transport or
	 * association, but not a socket.
L
Linus Torvalds 已提交
2540
	 */
2541 2542 2543 2544 2545 2546 2547
	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
2548

2549 2550 2551 2552 2553
	if (error)
		return error;

	/* If changes are for association, also apply parameters to each
	 * transport.
L
Linus Torvalds 已提交
2554
	 */
2555
	if (!trans && asoc) {
2556 2557
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2558 2559 2560 2561 2562
			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
						    hb_change, pmtud_change,
						    sackdelay_change);
		}
	}
L
Linus Torvalds 已提交
2563 2564 2565 2566

	return 0;
}

2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
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;
}

2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
/*
 * 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.
2611 2612
 */

2613
static int sctp_setsockopt_delayed_ack(struct sock *sk,
2614
				       char __user *optval, unsigned int optlen)
2615
{
2616
	struct sctp_sack_info    params;
2617 2618 2619 2620
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

2621 2622 2623
	if (optlen == sizeof(struct sctp_sack_info)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
2624

2625 2626 2627
		if (params.sack_delay == 0 && params.sack_freq == 0)
			return 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2628
		pr_warn_ratelimited(DEPRECATED
2629
				    "%s (pid %d) "
2630
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2631 2632
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
2633 2634 2635 2636 2637 2638 2639 2640
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;

		if (params.sack_delay == 0)
			params.sack_freq = 1;
		else
			params.sack_freq = 0;
	} else
2641
		return -EINVAL;
2642 2643

	/* Validate value parameter. */
2644
	if (params.sack_delay > 500)
2645 2646
		return -EINVAL;

2647
	/* Get association, if sack_assoc_id != 0 and the socket is a one
2648 2649
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
2650
	 */
2651 2652
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2653 2654
		return -EINVAL;

2655
	if (params.sack_delay) {
2656 2657
		if (asoc) {
			asoc->sackdelay =
2658
				msecs_to_jiffies(params.sack_delay);
2659
			asoc->param_flags =
2660
				sctp_spp_sackdelay_enable(asoc->param_flags);
2661
		} else {
2662
			sp->sackdelay = params.sack_delay;
2663
			sp->param_flags =
2664
				sctp_spp_sackdelay_enable(sp->param_flags);
2665
		}
2666 2667 2668
	}

	if (params.sack_freq == 1) {
2669
		if (asoc) {
2670
			asoc->param_flags =
2671
				sctp_spp_sackdelay_disable(asoc->param_flags);
2672
		} else {
2673
			sp->param_flags =
2674
				sctp_spp_sackdelay_disable(sp->param_flags);
2675
		}
2676 2677 2678 2679
	} else if (params.sack_freq > 1) {
		if (asoc) {
			asoc->sackfreq = params.sack_freq;
			asoc->param_flags =
2680
				sctp_spp_sackdelay_enable(asoc->param_flags);
2681 2682 2683
		} else {
			sp->sackfreq = params.sack_freq;
			sp->param_flags =
2684
				sctp_spp_sackdelay_enable(sp->param_flags);
2685
		}
2686 2687 2688 2689
	}

	/* If change is for association, also apply to each transport. */
	if (asoc) {
2690 2691
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2692
			if (params.sack_delay) {
2693
				trans->sackdelay =
2694
					msecs_to_jiffies(params.sack_delay);
2695
				trans->param_flags =
2696
					sctp_spp_sackdelay_enable(trans->param_flags);
2697
			}
2698
			if (params.sack_freq == 1) {
2699
				trans->param_flags =
2700
					sctp_spp_sackdelay_disable(trans->param_flags);
2701 2702 2703
			} else if (params.sack_freq > 1) {
				trans->sackfreq = params.sack_freq;
				trans->param_flags =
2704
					sctp_spp_sackdelay_enable(trans->param_flags);
2705 2706 2707
			}
		}
	}
2708

2709 2710 2711
	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.
 */
2723
static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
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2724 2725 2726 2727 2728 2729 2730 2731 2732 2733
{
	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)
2734
		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
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	if (sinit.sinit_max_instreams)
2736
		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
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2737
	if (sinit.sinit_max_attempts)
2738
		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
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2739
	if (sinit.sinit_max_init_timeo)
2740
		sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
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2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759

	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,
2760 2761
					      char __user *optval,
					      unsigned int optlen)
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{
	struct sctp_sock *sp = sctp_sk(sk);
2764 2765
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
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2766

2767
	if (optlen != sizeof(info))
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2768 2769 2770
		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
2771 2772 2773 2774
	if (info.sinfo_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;
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2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795

	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;
}

2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
/* 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,
2841
					unsigned int optlen)
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2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869
{
	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,
2870
				   unsigned int optlen)
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2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894
{
	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.
 *
 */
2895 2896
static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
{
L
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2897 2898
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;
2899 2900
	unsigned long rto_min, rto_max;
	struct sctp_sock *sp = sctp_sk(sk);
L
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2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913

	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;

2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929
	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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2930 2931
	if (asoc) {
		if (rtoinfo.srto_initial != 0)
2932
			asoc->rto_initial =
L
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2933
				msecs_to_jiffies(rtoinfo.srto_initial);
2934 2935
		asoc->rto_max = rto_max;
		asoc->rto_min = rto_min;
L
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2936 2937 2938 2939 2940 2941
	} 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;
2942 2943
		sp->rtoinfo.srto_max = rto_max;
		sp->rtoinfo.srto_min = rto_min;
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2944 2945 2946 2947 2948 2949 2950 2951 2952
	}

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
2953
 * This option is used to tune the maximum retransmission attempts
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2954 2955 2956 2957 2958 2959
 * 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.
 *
 */
2960
static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
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2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977
{

	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) {
2978 2979 2980 2981 2982
		if (assocparams.sasoc_asocmaxrxt != 0) {
			__u32 path_sum = 0;
			int   paths = 0;
			struct sctp_transport *peer_addr;

2983 2984
			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
					transports) {
2985 2986 2987 2988
				path_sum += peer_addr->pathmaxrxt;
				paths++;
			}

2989
			/* Only validate asocmaxrxt if we have more than
2990 2991 2992 2993 2994 2995 2996 2997
			 * 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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2998
			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2999 3000
		}

3001 3002
		if (assocparams.sasoc_cookie_life != 0)
			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
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3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
	} 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.
 */
3027
static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
L
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3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044
{
	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;
}

/*
3045 3046 3047
 * 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
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3048 3049 3050
 * 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
3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069
 * 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
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3070
 */
3071
static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
L
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3072
{
3073
	struct sctp_assoc_value params;
L
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3074 3075 3076 3077
	struct sctp_association *asoc;
	struct sctp_sock *sp = sctp_sk(sk);
	int val;

3078
	if (optlen == sizeof(int)) {
3079
		pr_warn_ratelimited(DEPRECATED
3080
				    "%s (pid %d) "
3081
				    "Use of int in maxseg socket option.\n"
3082 3083
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3084 3085 3086 3087 3088 3089 3090 3091
		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
L
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3092
		return -EINVAL;
3093

3094
	if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
L
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3095 3096
		return -EINVAL;

3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107
	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);
		}
3108 3109
		asoc->user_frag = val;
		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3110 3111
	} else {
		sp->user_frag = val;
L
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3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
	}

	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,
3127
					     unsigned int optlen)
L
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3128
{
3129
	struct net *net = sock_net(sk);
L
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3130 3131 3132 3133
	struct sctp_sock	*sp;
	struct sctp_association	*asoc = NULL;
	struct sctp_setpeerprim	prim;
	struct sctp_chunk	*chunk;
3134
	struct sctp_af		*af;
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3135 3136 3137 3138
	int 			err;

	sp = sctp_sk(sk);

3139
	if (!net->sctp.addip_enable)
L
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3140 3141 3142 3143 3144 3145 3146 3147 3148
		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);
3149
	if (!asoc)
L
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3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160
		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;

3161 3162 3163 3164 3165 3166 3167
	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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3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178
	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);

3179
	pr_debug("%s: we set peer primary addr primitively\n", __func__);
L
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3180 3181 3182 3183

	return err;
}

3184
static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3185
					    unsigned int optlen)
L
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3186
{
3187
	struct sctp_setadaptation adaptation;
L
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3188

3189
	if (optlen != sizeof(struct sctp_setadaptation))
L
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3190
		return -EINVAL;
3191
	if (copy_from_user(&adaptation, optval, optlen))
L
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3192 3193
		return -EFAULT;

3194
	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
L
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3195 3196 3197 3198

	return 0;
}

3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213
/*
 * 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,
3214
				   unsigned int optlen)
3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238
{
	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;
}

3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264
/*
 * 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,
3265
					       unsigned int optlen)
3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278
{
	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;
}

3279
/*
3280
 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3281
 *       (SCTP_PARTIAL_DELIVERY_POINT)
3282
 *
3283 3284 3285
 * 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
3286
 * lower value will cause partial deliveries to happen more often.  The
3287
 * calls argument is an integer that sets or gets the partial delivery
3288 3289 3290 3291 3292 3293 3294
 * 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.
3295 3296 3297
 */
static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
						  char __user *optval,
3298
						  unsigned int optlen)
3299 3300 3301 3302 3303 3304 3305 3306
{
	u32 val;

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

3307 3308 3309 3310 3311 3312
	/* 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;

3313 3314 3315 3316 3317
	sctp_sk(sk)->pd_point = val;

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

3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330
/*
 * 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,
3331
				    unsigned int optlen)
3332
{
3333 3334 3335
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
3336
	int val;
3337
	int assoc_id = 0;
3338

3339
	if (optlen == sizeof(int)) {
3340
		pr_warn_ratelimited(DEPRECATED
3341
				    "%s (pid %d) "
3342
				    "Use of int in max_burst socket option deprecated.\n"
3343 3344
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3345 3346 3347 3348 3349 3350 3351 3352
		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
3353 3354
		return -EINVAL;

3355 3356 3357 3358 3359 3360 3361 3362 3363
	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;
3364 3365 3366 3367

	return 0;
}

3368 3369 3370 3371 3372 3373 3374 3375
/*
 * 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,
3376 3377
				      char __user *optval,
				      unsigned int optlen)
3378
{
3379
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3380 3381
	struct sctp_authchunk val;

3382
	if (!ep->auth_enable)
3383 3384
		return -EACCES;

3385 3386 3387 3388 3389 3390
	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
3391 3392 3393 3394 3395
	case SCTP_CID_INIT:
	case SCTP_CID_INIT_ACK:
	case SCTP_CID_SHUTDOWN_COMPLETE:
	case SCTP_CID_AUTH:
		return -EINVAL;
3396 3397 3398
	}

	/* add this chunk id to the endpoint */
3399
	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3400 3401 3402 3403 3404 3405 3406 3407 3408
}

/*
 * 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,
3409 3410
				      char __user *optval,
				      unsigned int optlen)
3411
{
3412
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3413
	struct sctp_hmacalgo *hmacs;
3414
	u32 idents;
3415 3416
	int err;

3417
	if (!ep->auth_enable)
3418 3419
		return -EACCES;

3420 3421 3422
	if (optlen < sizeof(struct sctp_hmacalgo))
		return -EINVAL;

3423
	hmacs = memdup_user(optval, optlen);
3424 3425
	if (IS_ERR(hmacs))
		return PTR_ERR(hmacs);
3426

3427 3428 3429
	idents = hmacs->shmac_num_idents;
	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3430 3431 3432 3433
		err = -EINVAL;
		goto out;
	}

3434
	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447
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,
3448
				    unsigned int optlen)
3449
{
3450
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3451 3452 3453 3454
	struct sctp_authkey *authkey;
	struct sctp_association *asoc;
	int ret;

3455
	if (!ep->auth_enable)
3456 3457
		return -EACCES;

3458 3459 3460
	if (optlen <= sizeof(struct sctp_authkey))
		return -EINVAL;

3461
	authkey = memdup_user(optval, optlen);
3462 3463
	if (IS_ERR(authkey))
		return PTR_ERR(authkey);
3464

3465
	if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3466 3467 3468 3469
		ret = -EINVAL;
		goto out;
	}

3470 3471 3472 3473 3474 3475
	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
	if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
		ret = -EINVAL;
		goto out;
	}

3476
	ret = sctp_auth_set_key(ep, asoc, authkey);
3477
out:
3478
	kzfree(authkey);
3479 3480 3481 3482 3483 3484 3485 3486 3487 3488
	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,
3489 3490
				      char __user *optval,
				      unsigned int optlen)
3491
{
3492
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3493 3494 3495
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3496
	if (!ep->auth_enable)
3497 3498
		return -EACCES;

3499 3500 3501 3502 3503 3504 3505 3506 3507
	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;

3508
	return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3509 3510 3511 3512 3513 3514 3515 3516
}

/*
 * 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,
3517 3518
				   char __user *optval,
				   unsigned int optlen)
3519
{
3520
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3521 3522 3523
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3524
	if (!ep->auth_enable)
3525 3526
		return -EACCES;

3527 3528 3529 3530 3531 3532 3533 3534 3535
	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;

3536
	return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3537 3538 3539

}

3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568
/*
 * 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;

3569
	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3570 3571 3572 3573 3574
	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,
3575
		    &sock_net(sk)->sctp.auto_asconf_splist);
3576 3577
		sp->do_auto_asconf = 1;
	}
3578
	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3579 3580 3581
	return 0;
}

3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631
/*
 * 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;
}

3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
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;
}

3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663
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;
}

L
Linus Torvalds 已提交
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682
/* 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.
 */
3683 3684
static int sctp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3685 3686 3687
{
	int retval = 0;

3688
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701

	/* 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;
	}

3702
	lock_sock(sk);
L
Linus Torvalds 已提交
3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716

	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;

3717 3718 3719 3720 3721 3722 3723
	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
3724 3725
	case SCTP_SOCKOPT_CONNECTX:
		/* 'optlen' is the size of the addresses buffer. */
3726 3727 3728
		retval = sctp_setsockopt_connectx(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
F
Frank Filz 已提交
3729 3730
		break;

L
Linus Torvalds 已提交
3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
	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;

3747
	case SCTP_DELAYED_SACK:
3748
		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3749
		break;
3750 3751 3752
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
		break;
3753

L
Linus Torvalds 已提交
3754 3755 3756 3757 3758 3759 3760
	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;
3761 3762 3763
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784
	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;
3785 3786
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
L
Linus Torvalds 已提交
3787
		break;
3788 3789 3790
	case SCTP_CONTEXT:
		retval = sctp_setsockopt_context(sk, optval, optlen);
		break;
3791 3792 3793
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
		break;
3794 3795 3796
	case SCTP_MAX_BURST:
		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
		break;
3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811
	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;
3812 3813 3814
	case SCTP_AUTO_ASCONF:
		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
		break;
3815 3816 3817
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
		break;
3818 3819 3820
	case SCTP_RECVRCVINFO:
		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
		break;
3821 3822 3823
	case SCTP_RECVNXTINFO:
		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
3824 3825 3826
	default:
		retval = -ENOPROTOOPT;
		break;
3827
	}
L
Linus Torvalds 已提交
3828

3829
	release_sock(sk);
L
Linus Torvalds 已提交
3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850

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.
 */
3851 3852
static int sctp_connect(struct sock *sk, struct sockaddr *addr,
			int addr_len)
L
Linus Torvalds 已提交
3853 3854
{
	int err = 0;
F
Frank Filz 已提交
3855
	struct sctp_af *af;
L
Linus Torvalds 已提交
3856

3857
	lock_sock(sk);
L
Linus Torvalds 已提交
3858

3859 3860
	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
3861

F
Frank Filz 已提交
3862 3863 3864 3865 3866 3867 3868 3869
	/* 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.
		 */
3870
		err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
L
Linus Torvalds 已提交
3871 3872
	}

3873
	release_sock(sk);
L
Linus Torvalds 已提交
3874 3875 3876 3877
	return err;
}

/* FIXME: Write comments. */
3878
static int sctp_disconnect(struct sock *sk, int flags)
L
Linus Torvalds 已提交
3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889
{
	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.
 */
3890
static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
L
Linus Torvalds 已提交
3891 3892 3893 3894 3895 3896 3897 3898
{
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sock *newsk = NULL;
	struct sctp_association *asoc;
	long timeo;
	int error = 0;

3899
	lock_sock(sk);
L
Linus Torvalds 已提交
3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913

	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;
	}

3914
	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
L
Linus Torvalds 已提交
3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936

	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);

	newsk = sp->pf->create_accept_sk(sk, asoc);
	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:
3937
	release_sock(sk);
3938
	*err = error;
L
Linus Torvalds 已提交
3939 3940 3941 3942
	return newsk;
}

/* The SCTP ioctl handler. */
3943
static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
L
Linus Torvalds 已提交
3944
{
3945 3946
	int rc = -ENOTCONN;

3947
	lock_sock(sk);
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970

	/*
	 * 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;
3971
	}
3972 3973 3974 3975 3976
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
3977
	release_sock(sk);
3978
	return rc;
L
Linus Torvalds 已提交
3979 3980 3981 3982 3983 3984
}

/* 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.
 */
3985
static int sctp_init_sock(struct sock *sk)
L
Linus Torvalds 已提交
3986
{
3987
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3988 3989
	struct sctp_sock *sp;

3990
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014

	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;
	}

	/* 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;

4015
	sp->default_rcv_context = 0;
4016
	sp->max_burst = net->sctp.max_burst;
4017

4018 4019
	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;

L
Linus Torvalds 已提交
4020 4021 4022 4023 4024 4025
	/* 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;
4026 4027
	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
4028 4029 4030 4031

	/* Initialize default RTO related parameters.  These parameters can
	 * be modified for with the SCTP_RTOINFO socket option.
	 */
4032 4033 4034
	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
4035 4036 4037 4038

	/* Initialize default association related parameters. These parameters
	 * can be modified with the SCTP_ASSOCINFO socket option.
	 */
4039
	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
L
Linus Torvalds 已提交
4040 4041 4042
	sp->assocparams.sasoc_number_peer_destinations = 0;
	sp->assocparams.sasoc_peer_rwnd = 0;
	sp->assocparams.sasoc_local_rwnd = 0;
4043
	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
L
Linus Torvalds 已提交
4044 4045

	/* Initialize default event subscriptions. By default, all the
4046
	 * options are off.
L
Linus Torvalds 已提交
4047 4048 4049 4050 4051 4052
	 */
	memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));

	/* Default Peer Address Parameters.  These defaults can
	 * be modified via SCTP_PEER_ADDR_PARAMS
	 */
4053 4054
	sp->hbinterval  = net->sctp.hb_interval;
	sp->pathmaxrxt  = net->sctp.max_retrans_path;
4055
	sp->pathmtu     = 0; /* allow default discovery */
4056
	sp->sackdelay   = net->sctp.sack_timeout;
4057
	sp->sackfreq	= 2;
4058
	sp->param_flags = SPP_HB_ENABLE |
4059 4060
			  SPP_PMTUD_ENABLE |
			  SPP_SACKDELAY_ENABLE;
L
Linus Torvalds 已提交
4061 4062 4063 4064 4065 4066

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

4067 4068
	/* Enable Nagle algorithm by default.  */
	sp->nodelay           = 0;
L
Linus Torvalds 已提交
4069

4070
	sp->recvrcvinfo = 0;
4071
	sp->recvnxtinfo = 0;
4072

L
Linus Torvalds 已提交
4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085
	/* 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;

4086
	sp->adaptation_ind = 0;
L
Linus Torvalds 已提交
4087 4088 4089 4090

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

	/* Control variables for partial data delivery. */
4091
	atomic_set(&sp->pd_mode, 0);
L
Linus Torvalds 已提交
4092
	skb_queue_head_init(&sp->pd_lobby);
4093
	sp->frag_interleave = 0;
L
Linus Torvalds 已提交
4094 4095 4096 4097 4098

	/* 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.
	 */
4099 4100
	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
	if (!sp->ep)
L
Linus Torvalds 已提交
4101 4102 4103 4104
		return -ENOMEM;

	sp->hmac = NULL;

4105 4106
	sk->sk_destruct = sctp_destruct_sock;

L
Linus Torvalds 已提交
4107
	SCTP_DBG_OBJCNT_INC(sock);
4108 4109

	local_bh_disable();
4110
	percpu_counter_inc(&sctp_sockets_allocated);
4111
	sock_prot_inuse_add(net, sk->sk_prot, 1);
4112 4113 4114 4115

	/* Nothing can fail after this block, otherwise
	 * sctp_destroy_sock() will be called without addr_wq_lock held
	 */
4116
	if (net->sctp.default_auto_asconf) {
4117
		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4118
		list_add_tail(&sp->auto_asconf_list,
4119
		    &net->sctp.auto_asconf_splist);
4120
		sp->do_auto_asconf = 1;
4121 4122
		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
	} else {
4123
		sp->do_auto_asconf = 0;
4124 4125
	}

4126 4127
	local_bh_enable();

L
Linus Torvalds 已提交
4128 4129 4130
	return 0;
}

4131 4132 4133
/* 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
 */
4134
static void sctp_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
4135
{
4136
	struct sctp_sock *sp;
L
Linus Torvalds 已提交
4137

4138
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4139 4140

	/* Release our hold on the endpoint. */
4141
	sp = sctp_sk(sk);
4142 4143 4144 4145 4146 4147
	/* 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;

4148 4149 4150 4151 4152
	if (sp->do_auto_asconf) {
		sp->do_auto_asconf = 0;
		list_del(&sp->auto_asconf_list);
	}
	sctp_endpoint_free(sp->ep);
4153
	local_bh_disable();
4154
	percpu_counter_dec(&sctp_sockets_allocated);
4155
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4156
	local_bh_enable();
L
Linus Torvalds 已提交
4157 4158
}

4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169
/* 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. */
	crypto_free_hash(sp->hmac);

	inet_sock_destruct(sk);
}

L
Linus Torvalds 已提交
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185
/* 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.
 */
4186
static void sctp_shutdown(struct sock *sk, int how)
L
Linus Torvalds 已提交
4187
{
4188
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;

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

	if (how & SEND_SHUTDOWN) {
		ep = sctp_sk(sk)->ep;
		if (!list_empty(&ep->asocs)) {
			asoc = list_entry(ep->asocs.next,
					  struct sctp_association, asocs);
4200
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221
		}
	}
}

/* 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;

4222
	if (len < sizeof(status)) {
L
Linus Torvalds 已提交
4223 4224 4225 4226
		retval = -EINVAL;
		goto out;
	}

4227 4228
	len = sizeof(status);
	if (copy_from_user(&status, optval, len)) {
L
Linus Torvalds 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242
		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);
4243
	status.sstat_state = sctp_assoc_to_state(asoc);
L
Linus Torvalds 已提交
4244 4245 4246 4247 4248 4249 4250 4251
	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);
4252 4253
	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
			transport->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
4254
	/* Map ipv4 address into v4-mapped-on-v6 address.  */
4255
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
4256
		(union sctp_addr *)&status.sstat_primary.spinfo_address);
F
Frank Filz 已提交
4257
	status.sstat_primary.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4258 4259 4260
	status.sstat_primary.spinfo_cwnd = transport->cwnd;
	status.sstat_primary.spinfo_srtt = transport->srtt;
	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4261
	status.sstat_primary.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4262

F
Frank Filz 已提交
4263 4264 4265
	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
		status.sstat_primary.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4266 4267 4268 4269 4270
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

4271 4272 4273
	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
4274 4275 4276 4277 4278 4279 4280

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

out:
E
Eric Dumazet 已提交
4281
	return retval;
L
Linus Torvalds 已提交
4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299
}


/* 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;

4300
	if (len < sizeof(pinfo)) {
L
Linus Torvalds 已提交
4301 4302 4303 4304
		retval = -EINVAL;
		goto out;
	}

4305 4306
	len = sizeof(pinfo);
	if (copy_from_user(&pinfo, optval, len)) {
L
Linus Torvalds 已提交
4307 4308 4309 4310 4311 4312 4313 4314 4315 4316
		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
4317
	pinfo.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4318 4319 4320
	pinfo.spinfo_cwnd = transport->cwnd;
	pinfo.spinfo_srtt = transport->srtt;
	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4321
	pinfo.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4322

F
Frank Filz 已提交
4323 4324 4325
	if (pinfo.spinfo_state == SCTP_UNKNOWN)
		pinfo.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336
	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
4337
	return retval;
L
Linus Torvalds 已提交
4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371
}

/* 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)
{
4372
	if (len <= 0)
L
Linus Torvalds 已提交
4373
		return -EINVAL;
4374 4375
	if (len > sizeof(struct sctp_event_subscribe))
		len = sizeof(struct sctp_event_subscribe);
4376 4377
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398
	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;
4399
	if (len < sizeof(int))
L
Linus Torvalds 已提交
4400
		return -EINVAL;
4401 4402 4403 4404
	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
4405 4406 4407 4408 4409
		return -EFAULT;
	return 0;
}

/* Helper routine to branch off an association to a new socket.  */
B
Benjamin Poirier 已提交
4410
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
L
Linus Torvalds 已提交
4411
{
B
Benjamin Poirier 已提交
4412
	struct sctp_association *asoc = sctp_id2assoc(sk, id);
4413
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
4414 4415 4416
	struct socket *sock;
	int err = 0;

B
Benjamin Poirier 已提交
4417 4418 4419
	if (!asoc)
		return -EINVAL;

L
Linus Torvalds 已提交
4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
	/* 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;

4431
	sctp_copy_sock(sock->sk, sk, asoc);
4432 4433 4434 4435

	/* Make peeled-off sockets more like 1-1 accepted sockets.
	 * Set the daddr and initialize id to something more random
	 */
4436
	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4437 4438 4439 4440 4441

	/* 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);
4442

L
Linus Torvalds 已提交
4443 4444 4445 4446
	*sockp = sock;

	return err;
}
B
Benjamin Poirier 已提交
4447
EXPORT_SYMBOL(sctp_do_peeloff);
L
Linus Torvalds 已提交
4448 4449 4450 4451 4452

static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	sctp_peeloff_arg_t peeloff;
	struct socket *newsock;
4453
	struct file *newfile;
L
Linus Torvalds 已提交
4454 4455
	int retval = 0;

4456
	if (len < sizeof(sctp_peeloff_arg_t))
L
Linus Torvalds 已提交
4457
		return -EINVAL;
4458
	len = sizeof(sctp_peeloff_arg_t);
L
Linus Torvalds 已提交
4459 4460 4461
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

B
Benjamin Poirier 已提交
4462
	retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
L
Linus Torvalds 已提交
4463 4464 4465 4466
	if (retval < 0)
		goto out;

	/* Map the socket to an unused fd that can be returned to the user.  */
4467
	retval = get_unused_fd_flags(0);
L
Linus Torvalds 已提交
4468 4469 4470 4471 4472
	if (retval < 0) {
		sock_release(newsock);
		goto out;
	}

4473
	newfile = sock_alloc_file(newsock, 0, NULL);
4474
	if (IS_ERR(newfile)) {
4475 4476 4477 4478 4479
		put_unused_fd(retval);
		sock_release(newsock);
		return PTR_ERR(newfile);
	}

4480 4481
	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
		 retval);
L
Linus Torvalds 已提交
4482 4483

	/* Return the fd mapped to the new socket.  */
4484 4485 4486 4487 4488
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
	}
L
Linus Torvalds 已提交
4489
	peeloff.sd = retval;
4490 4491 4492
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
		put_unused_fd(retval);
4493
		return -EFAULT;
4494 4495
	}
	fd_install(retval, newfile);
L
Linus Torvalds 已提交
4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
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 {
4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521
 *     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
4522 4523
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
4524 4525 4526
 *                     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
4527 4528
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
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 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591
 *                     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
4592 4593
 */
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4594
					    char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
4595
{
4596 4597 4598 4599
	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
4600

4601
	if (len < sizeof(struct sctp_paddrparams))
L
Linus Torvalds 已提交
4602
		return -EINVAL;
4603
	len = sizeof(struct sctp_paddrparams);
L
Linus Torvalds 已提交
4604 4605 4606
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

4607 4608
	/* 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
4609
	 */
4610
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
4611 4612 4613
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans) {
4614
			pr_debug("%s: failed no transport\n", __func__);
4615 4616
			return -EINVAL;
		}
L
Linus Torvalds 已提交
4617 4618
	}

4619 4620 4621 4622 4623 4624
	/* 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)) {
4625
		pr_debug("%s: failed no association\n", __func__);
L
Linus Torvalds 已提交
4626
		return -EINVAL;
4627
	}
L
Linus Torvalds 已提交
4628

4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652
	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
4653

4654 4655 4656
		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = sp->param_flags;
	}
L
Linus Torvalds 已提交
4657 4658 4659 4660 4661 4662 4663 4664 4665 4666

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

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

	return 0;
}

4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685
/*
 * 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;
 * };
4686
 *
4687 4688 4689 4690
 * 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).
4691
 *
4692 4693 4694 4695
 * 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.
4696
 *
4697 4698 4699 4700
 * 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.
4701
 */
4702
static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4703 4704 4705
					    char __user *optval,
					    int __user *optlen)
{
4706
	struct sctp_sack_info    params;
4707 4708 4709
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

4710 4711
	if (len >= sizeof(struct sctp_sack_info)) {
		len = sizeof(struct sctp_sack_info);
4712

4713 4714 4715
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else if (len == sizeof(struct sctp_assoc_value)) {
4716
		pr_warn_ratelimited(DEPRECATED
4717
				    "%s (pid %d) "
4718
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4719 4720
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
4721 4722 4723
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
4724
		return -EINVAL;
4725

4726
	/* Get association, if sack_assoc_id != 0 and the socket is a one
4727 4728
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
4729
	 */
4730 4731
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4732 4733 4734 4735
		return -EINVAL;

	if (asoc) {
		/* Fetch association values. */
4736 4737
		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay = jiffies_to_msecs(
4738
				asoc->sackdelay);
4739 4740 4741 4742 4743 4744
			params.sack_freq = asoc->sackfreq;

		} else {
			params.sack_delay = 0;
			params.sack_freq = 1;
		}
4745 4746
	} else {
		/* Fetch socket values. */
4747 4748 4749 4750 4751 4752 4753
		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;
		}
4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764
	}

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

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

	return 0;
}

L
Linus Torvalds 已提交
4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777
/* 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)
{
4778
	if (len < sizeof(struct sctp_initmsg))
L
Linus Torvalds 已提交
4779
		return -EINVAL;
4780 4781 4782
	len = sizeof(struct sctp_initmsg);
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
4783 4784 4785 4786 4787
	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
		return -EFAULT;
	return 0;
}

4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813

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;

4814 4815
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
4816

4817 4818
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
				transports) {
4819
		memcpy(&temp, &from->ipaddr, sizeof(temp));
4820 4821
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
4822
		if (space_left < addrlen)
4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834
			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
4835 4836 4837 4838 4839
		return -EFAULT;

	return 0;
}

4840 4841
static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
			    size_t space_left, int *bytes_copied)
4842 4843 4844 4845 4846
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr temp;
	int cnt = 0;
	int addrlen;
4847
	struct net *net = sock_net(sk);
4848

4849
	rcu_read_lock();
4850
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4851 4852 4853
		if (!addr->valid)
			continue;

4854
		if ((PF_INET == sk->sk_family) &&
4855
		    (AF_INET6 == addr->a.sa.sa_family))
4856
			continue;
4857 4858 4859 4860
		if ((PF_INET6 == sk->sk_family) &&
		    inet_v6_ipv6only(sk) &&
		    (AF_INET == addr->a.sa.sa_family))
			continue;
4861
		memcpy(&temp, &addr->a, sizeof(temp));
4862 4863 4864
		if (!temp.v4.sin_port)
			temp.v4.sin_port = htons(port);

4865 4866 4867
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sctp_sk(sk), &temp);

4868 4869 4870 4871
		if (space_left < addrlen) {
			cnt =  -ENOMEM;
			break;
		}
4872
		memcpy(to, &temp, addrlen);
4873

4874
		to += addrlen;
4875
		cnt++;
4876
		space_left -= addrlen;
4877
		*bytes_copied += addrlen;
4878
	}
4879
	rcu_read_unlock();
4880 4881 4882 4883

	return cnt;
}

L
Linus Torvalds 已提交
4884

4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898
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;
4899 4900
	int bytes_copied = 0;
	void *addrs;
4901
	void *buf;
4902

4903
	if (len < sizeof(struct sctp_getaddrs))
4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923
		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;
	}

4924 4925
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
4926

4927
	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
4928 4929
	if (!addrs)
		return -ENOMEM;
4930 4931 4932 4933 4934 4935 4936

	/* 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);
4937
		if (sctp_is_any(sk, &addr->a)) {
4938 4939
			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
						space_left, &bytes_copied);
4940 4941
			if (cnt < 0) {
				err = cnt;
4942
				goto out;
4943
			}
4944
			goto copy_getaddrs;
4945 4946 4947
		}
	}

4948
	buf = addrs;
4949 4950 4951 4952 4953
	/* 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) {
4954
		memcpy(&temp, &addr->a, sizeof(temp));
4955 4956
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
4957 4958
		if (space_left < addrlen) {
			err =  -ENOMEM; /*fixme: right error?*/
4959
			goto out;
4960
		}
4961 4962
		memcpy(buf, &temp, addrlen);
		buf += addrlen;
4963
		bytes_copied += addrlen;
4964
		cnt++;
4965 4966 4967 4968
		space_left -= addrlen;
	}

copy_getaddrs:
4969 4970
	if (copy_to_user(to, addrs, bytes_copied)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
4971
		goto out;
4972
	}
4973 4974
	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
4975
		goto out;
4976
	}
4977
	if (put_user(bytes_copied, optlen))
4978
		err = -EFAULT;
S
Sebastian Siewior 已提交
4979
out:
4980
	kfree(addrs);
4981 4982 4983
	return err;
}

L
Linus Torvalds 已提交
4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996
/* 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);

4997
	if (len < sizeof(struct sctp_prim))
L
Linus Torvalds 已提交
4998 4999
		return -EINVAL;

5000 5001 5002
	len = sizeof(struct sctp_prim);

	if (copy_from_user(&prim, optval, len))
L
Linus Torvalds 已提交
5003 5004 5005 5006 5007 5008 5009 5010
		return -EFAULT;

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

	if (!asoc->peer.primary_path)
		return -ENOTCONN;
5011

5012 5013
	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
		asoc->peer.primary_path->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
5014

5015
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
L
Linus Torvalds 已提交
5016 5017
			(union sctp_addr *)&prim.ssp_addr);

5018 5019 5020
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &prim, len))
L
Linus Torvalds 已提交
5021 5022 5023 5024 5025 5026
		return -EFAULT;

	return 0;
}

/*
5027
 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
L
Linus Torvalds 已提交
5028
 *
5029
 * Requests that the local endpoint set the specified Adaptation Layer
L
Linus Torvalds 已提交
5030 5031
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
5032
static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
L
Linus Torvalds 已提交
5033 5034
				  char __user *optval, int __user *optlen)
{
5035
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
5036

5037
	if (len < sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
5038 5039
		return -EINVAL;

5040 5041
	len = sizeof(struct sctp_setadaptation);

5042
	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5043 5044 5045

	if (put_user(len, optlen))
		return -EFAULT;
5046
	if (copy_to_user(optval, &adaptation, len))
L
Linus Torvalds 已提交
5047
		return -EFAULT;
5048

L
Linus Torvalds 已提交
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
	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);
5076 5077
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
5078

5079
	if (len < sizeof(info))
L
Linus Torvalds 已提交
5080
		return -EINVAL;
5081

5082
	len = sizeof(info);
5083 5084

	if (copy_from_user(&info, optval, len))
L
Linus Torvalds 已提交
5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103
		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;
	}

5104 5105 5106
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
L
Linus Torvalds 已提交
5107 5108 5109 5110 5111
		return -EFAULT;

	return 0;
}

5112 5113 5114 5115 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 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153
/* 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
5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198
/*
 *
 * 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;

5199
	if (len < sizeof (struct sctp_rtoinfo))
L
Linus Torvalds 已提交
5200 5201
		return -EINVAL;

5202 5203 5204
	len = sizeof(struct sctp_rtoinfo);

	if (copy_from_user(&rtoinfo, optval, len))
L
Linus Torvalds 已提交
5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238
		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
 *
5239
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255
 * 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;

5256
	if (len < sizeof (struct sctp_assocparams))
L
Linus Torvalds 已提交
5257 5258
		return -EINVAL;

5259 5260 5261
	len = sizeof(struct sctp_assocparams);

	if (copy_from_user(&assocparams, optval, len))
L
Linus Torvalds 已提交
5262 5263 5264 5265 5266 5267 5268 5269
		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 */
5270
	if (asoc) {
L
Linus Torvalds 已提交
5271 5272 5273
		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5274
		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
L
Linus Torvalds 已提交
5275 5276

		list_for_each(pos, &asoc->peer.transport_addr_list) {
5277
			cnt++;
L
Linus Torvalds 已提交
5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
		}

		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;
}

5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343
/*
 * 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;

5344
	if (len < sizeof(struct sctp_assoc_value))
5345 5346
		return -EINVAL;

5347 5348
	len = sizeof(struct sctp_assoc_value);

5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370
	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
5371
/*
5372 5373 5374
 * 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
5375 5376 5377
 * 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
5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396
 * 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
5397 5398 5399 5400
 */
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
				  char __user *optval, int __user *optlen)
{
5401 5402
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
L
Linus Torvalds 已提交
5403

5404
	if (len == sizeof(int)) {
5405
		pr_warn_ratelimited(DEPRECATED
5406
				    "%s (pid %d) "
5407
				    "Use of int in maxseg socket option.\n"
5408 5409
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
5410 5411 5412 5413 5414 5415
		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
5416 5417
		return -EINVAL;

5418 5419 5420 5421 5422 5423 5424 5425
	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
5426 5427 5428

	if (put_user(len, optlen))
		return -EFAULT;
5429 5430 5431 5432 5433 5434 5435
	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
5436 5437 5438 5439

	return 0;
}

5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462
/*
 * 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;
}

5463 5464 5465 5466 5467 5468 5469 5470
/*
 * 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)
{
5471
	u32 val;
5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483

	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;

5484
	return 0;
5485 5486
}

5487 5488 5489 5490 5491 5492 5493 5494
/*
 * 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)
{
5495 5496 5497
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
5498

5499
	if (len == sizeof(int)) {
5500
		pr_warn_ratelimited(DEPRECATED
5501
				    "%s (pid %d) "
5502
				    "Use of int in max_burst socket option.\n"
5503 5504
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
5505
		params.assoc_id = 0;
5506 5507
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
5508 5509 5510 5511
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
		return -EINVAL;
5512

5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531
	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;
5532 5533 5534

}

5535 5536 5537
static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
5538
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5539
	struct sctp_hmacalgo  __user *p = (void __user *)optval;
5540
	struct sctp_hmac_algo_param *hmacs;
5541 5542 5543
	__u16 data_len = 0;
	u32 num_idents;

5544
	if (!ep->auth_enable)
5545
		return -EACCES;
5546

5547
	hmacs = ep->auth_hmacs_list;
5548
	data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5549

5550
	if (len < sizeof(struct sctp_hmacalgo) + data_len)
5551
		return -EINVAL;
5552 5553 5554 5555

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

5556 5557
	if (put_user(len, optlen))
		return -EFAULT;
5558 5559 5560
	if (put_user(num_idents, &p->shmac_num_idents))
		return -EFAULT;
	if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5561 5562 5563 5564 5565 5566 5567
		return -EFAULT;
	return 0;
}

static int sctp_getsockopt_active_key(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
5568
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5569 5570 5571
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

5572
	if (!ep->auth_enable)
5573 5574
		return -EACCES;

5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586
	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
5587
		val.scact_keynumber = ep->active_key_id;
5588

5589 5590 5591 5592 5593 5594
	len = sizeof(struct sctp_authkeyid);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

5595 5596 5597 5598 5599 5600
	return 0;
}

static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
5601
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
5602
	struct sctp_authchunks __user *p = (void __user *)optval;
5603 5604 5605
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
5606
	u32    num_chunks = 0;
5607 5608
	char __user *to;

5609
	if (!ep->auth_enable)
5610 5611 5612
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
5613 5614
		return -EINVAL;

5615
	if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5616 5617
		return -EFAULT;

A
Al Viro 已提交
5618
	to = p->gauth_chunks;
5619 5620 5621 5622 5623
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc)
		return -EINVAL;

	ch = asoc->peer.peer_chunks;
5624 5625
	if (!ch)
		goto num;
5626 5627

	/* See if the user provided enough room for all the data */
5628 5629
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
	if (len < num_chunks)
5630 5631
		return -EINVAL;

5632
	if (copy_to_user(to, ch->chunks, num_chunks))
5633
		return -EFAULT;
5634 5635
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
5636 5637
	if (put_user(len, optlen))
		return -EFAULT;
5638 5639
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
5640 5641 5642 5643 5644 5645
	return 0;
}

static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
5646
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
5647
	struct sctp_authchunks __user *p = (void __user *)optval;
5648 5649 5650
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
5651
	u32    num_chunks = 0;
5652 5653
	char __user *to;

5654
	if (!ep->auth_enable)
5655 5656 5657
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
5658 5659
		return -EINVAL;

5660
	if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5661 5662
		return -EFAULT;

A
Al Viro 已提交
5663
	to = p->gauth_chunks;
5664 5665 5666 5667 5668
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
5669
		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5670
	else
5671
		ch = ep->auth_chunk_list;
5672

5673 5674 5675
	if (!ch)
		goto num;

5676
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5677
	if (len < sizeof(struct sctp_authchunks) + num_chunks)
5678 5679
		return -EINVAL;

5680 5681 5682 5683
	if (copy_to_user(to, ch->chunks, num_chunks))
		return -EFAULT;
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
5684 5685
	if (put_user(len, optlen))
		return -EFAULT;
5686 5687
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
5688 5689 5690 5691

	return 0;
}

5692 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
/*
 * 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;
}

5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745
/*
 * 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;
}

5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794
/*
 * 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;

	ids = kmalloc(len, GFP_KERNEL);
	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;
}

5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839
/*
 * 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;
}

5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856
/*
 * 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;

5857 5858 5859
	/* Allow the struct to grow and fill in as much as possible */
	len = min_t(size_t, len, sizeof(sas));

5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895
	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;

5896
	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5897 5898 5899 5900 5901 5902 5903

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

	return 0;
}

5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923
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;
}

5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943
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;
}

5944 5945
static int sctp_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
5946 5947 5948 5949
{
	int retval = 0;
	int len;

5950
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967

	/* 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;

5968
	lock_sock(sk);
L
Linus Torvalds 已提交
5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990

	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;
5991
	case SCTP_DELAYED_SACK:
5992
		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5993 5994
							  optlen);
		break;
L
Linus Torvalds 已提交
5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005
	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;
6006 6007 6008
	case SCTP_SOCKOPT_CONNECTX3:
		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
6009 6010 6011 6012
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_getsockopt_default_send_param(sk, len,
							    optval, optlen);
		break;
6013 6014 6015 6016
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_getsockopt_default_sndinfo(sk, len,
							 optval, optlen);
		break;
L
Linus Torvalds 已提交
6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038
	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;
6039 6040
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
L
Linus Torvalds 已提交
6041 6042
							optlen);
		break;
6043 6044 6045
	case SCTP_CONTEXT:
		retval = sctp_getsockopt_context(sk, len, optval, optlen);
		break;
6046 6047 6048 6049
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
							     optlen);
		break;
6050 6051 6052 6053
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
								optlen);
		break;
6054 6055 6056
	case SCTP_MAX_BURST:
		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
		break;
6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075
	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;
6076 6077 6078
	case SCTP_GET_ASSOC_NUMBER:
		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
		break;
6079 6080 6081
	case SCTP_GET_ASSOC_ID_LIST:
		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
		break;
6082 6083 6084
	case SCTP_AUTO_ASCONF:
		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
		break;
6085 6086 6087
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
		break;
6088 6089 6090
	case SCTP_GET_ASSOC_STATS:
		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
		break;
6091 6092 6093
	case SCTP_RECVRCVINFO:
		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
		break;
6094 6095 6096
	case SCTP_RECVNXTINFO:
		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
6097 6098 6099
	default:
		retval = -ENOPROTOOPT;
		break;
6100
	}
L
Linus Torvalds 已提交
6101

6102
	release_sock(sk);
L
Linus Torvalds 已提交
6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128
	return retval;
}

static void sctp_hash(struct sock *sk)
{
	/* STUB */
}

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(
6129
	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
L
Linus Torvalds 已提交
6130 6131 6132 6133

static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
{
	struct sctp_bind_hashbucket *head; /* hash list */
6134
	struct sctp_bind_bucket *pp;
L
Linus Torvalds 已提交
6135 6136 6137
	unsigned short snum;
	int ret;

A
Al Viro 已提交
6138
	snum = ntohs(addr->v4.sin_port);
L
Linus Torvalds 已提交
6139

6140 6141
	pr_debug("%s: begins, snum:%d\n", __func__, snum);

6142
	local_bh_disable();
L
Linus Torvalds 已提交
6143 6144

	if (snum == 0) {
S
Stephen Hemminger 已提交
6145
		/* Search for an available port. */
6146 6147
		int low, high, remaining, index;
		unsigned int rover;
6148
		struct net *net = sock_net(sk);
6149

6150
		inet_get_local_port_range(net, &low, &high);
6151
		remaining = (high - low) + 1;
6152
		rover = prandom_u32() % remaining + low;
L
Linus Torvalds 已提交
6153 6154 6155 6156 6157

		do {
			rover++;
			if ((rover < low) || (rover > high))
				rover = low;
6158
			if (inet_is_local_reserved_port(net, rover))
6159
				continue;
6160
			index = sctp_phashfn(sock_net(sk), rover);
L
Linus Torvalds 已提交
6161
			head = &sctp_port_hashtable[index];
6162
			spin_lock(&head->lock);
6163
			sctp_for_each_hentry(pp, &head->chain)
6164 6165
				if ((pp->port == rover) &&
				    net_eq(sock_net(sk), pp->net))
L
Linus Torvalds 已提交
6166 6167 6168
					goto next;
			break;
		next:
6169
			spin_unlock(&head->lock);
L
Linus Torvalds 已提交
6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188
		} 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.
		 */
6189
		head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6190
		spin_lock(&head->lock);
6191
		sctp_for_each_hentry(pp, &head->chain) {
6192
			if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
L
Linus Torvalds 已提交
6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207
				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;

6208 6209
		pr_debug("%s: found a possible match\n", __func__);

6210 6211
		if (pp->fastreuse && sk->sk_reuse &&
			sk->sk_state != SCTP_SS_LISTENING)
L
Linus Torvalds 已提交
6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223
			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.
		 */
6224
		sk_for_each_bound(sk2, &pp->owner) {
L
Linus Torvalds 已提交
6225 6226 6227
			struct sctp_endpoint *ep2;
			ep2 = sctp_sk(sk2)->ep;

6228 6229 6230
			if (sk == sk2 ||
			    (reuse && sk2->sk_reuse &&
			     sk2->sk_state != SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
6231 6232
				continue;

6233 6234
			if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
						 sctp_sk(sk2), sctp_sk(sk))) {
L
Linus Torvalds 已提交
6235 6236 6237 6238
				ret = (long)sk2;
				goto fail_unlock;
			}
		}
6239 6240

		pr_debug("%s: found a match\n", __func__);
L
Linus Torvalds 已提交
6241 6242 6243 6244
	}
pp_not_found:
	/* If there was a hash table miss, create a new port.  */
	ret = 1;
6245
	if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
L
Linus Torvalds 已提交
6246 6247 6248 6249 6250 6251
		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-).
	 */
6252 6253 6254 6255 6256 6257 6258
	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
6259 6260 6261 6262 6263 6264 6265 6266
		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
6267
		inet_sk(sk)->inet_num = snum;
L
Linus Torvalds 已提交
6268 6269 6270 6271 6272 6273
		sk_add_bind_node(sk, &pp->owner);
		sctp_sk(sk)->bind_hash = pp;
	}
	ret = 0;

fail_unlock:
6274
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
6275 6276

fail:
6277
	local_bh_enable();
L
Linus Torvalds 已提交
6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293
	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. */
6294
	return !!sctp_get_port_local(sk, &addr);
L
Linus Torvalds 已提交
6295 6296 6297
}

/*
6298
 *  Move a socket to LISTENING state.
L
Linus Torvalds 已提交
6299
 */
6300
static int sctp_listen_start(struct sock *sk, int backlog)
L
Linus Torvalds 已提交
6301 6302 6303
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
6304
	struct crypto_hash *tfm = NULL;
6305
	char alg[32];
L
Linus Torvalds 已提交
6306

6307
	/* Allocate HMAC for generating cookie. */
6308 6309 6310
	if (!sp->hmac && sp->sctp_hmac_alg) {
		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
		tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6311
		if (IS_ERR(tfm)) {
6312
			net_info_ratelimited("failed to load transform for %s: %ld\n",
6313
					     sp->sctp_hmac_alg, PTR_ERR(tfm));
6314 6315 6316
			return -ENOSYS;
		}
		sctp_sk(sk)->hmac = tfm;
L
Linus Torvalds 已提交
6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327
	}

	/*
	 * 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.
6328
	 *
L
Linus Torvalds 已提交
6329
	 */
6330
	sk->sk_state = SCTP_SS_LISTENING;
L
Linus Torvalds 已提交
6331 6332 6333
	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
6334
	} else {
E
Eric Dumazet 已提交
6335
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6336 6337 6338 6339
			sk->sk_state = SCTP_SS_CLOSED;
			return -EADDRINUSE;
		}
	}
6340

L
Linus Torvalds 已提交
6341 6342 6343 6344 6345 6346
	sk->sk_max_ack_backlog = backlog;
	sctp_hash_endpoint(ep);
	return 0;
}

/*
6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357
 * 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
6358 6359 6360 6361 6362
 *  Move a socket to LISTENING state.
 */
int sctp_inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
6363
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
L
Linus Torvalds 已提交
6364 6365 6366
	int err = -EINVAL;

	if (unlikely(backlog < 0))
6367
		return err;
L
Linus Torvalds 已提交
6368

6369
	lock_sock(sk);
L
Linus Torvalds 已提交
6370

6371 6372 6373 6374
	/* Peeled-off sockets are not allowed to listen().  */
	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
		goto out;

L
Linus Torvalds 已提交
6375 6376 6377
	if (sock->state != SS_UNCONNECTED)
		goto out;

6378 6379 6380
	/* If backlog is zero, disable listening. */
	if (!backlog) {
		if (sctp_sstate(sk, CLOSED))
L
Linus Torvalds 已提交
6381 6382
			goto out;

6383 6384 6385 6386 6387 6388
		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;
6389 6390
	}

6391 6392 6393 6394 6395 6396 6397 6398
	/* 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
6399

6400
	err = 0;
L
Linus Torvalds 已提交
6401
out:
6402
	release_sock(sk);
L
Linus Torvalds 已提交
6403 6404 6405 6406 6407 6408 6409 6410
	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
6411
 * the integrity of the counters (sndbuf and wmem_alloc) used
L
Linus Torvalds 已提交
6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424
 * 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
6425
	poll_wait(file, sk_sleep(sk), wait);
L
Linus Torvalds 已提交
6426 6427 6428 6429 6430 6431

	/* 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)) ?
6432
			(POLLIN | POLLRDNORM) : 0;
L
Linus Torvalds 已提交
6433 6434 6435 6436 6437

	mask = 0;

	/* Is there any exceptional events?  */
	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6438
		mask |= POLLERR |
6439
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6440
	if (sk->sk_shutdown & RCV_SHUTDOWN)
E
Eric Dumazet 已提交
6441
		mask |= POLLRDHUP | POLLIN | POLLRDNORM;
L
Linus Torvalds 已提交
6442 6443 6444 6445
	if (sk->sk_shutdown == SHUTDOWN_MASK)
		mask |= POLLHUP;

	/* Is it readable?  Reconsider this code with TCP-style support.  */
E
Eric Dumazet 已提交
6446
	if (!skb_queue_empty(&sk->sk_receive_queue))
L
Linus Torvalds 已提交
6447 6448 6449 6450 6451 6452 6453 6454 6455 6456
		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 {
6457
		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
L
Linus Torvalds 已提交
6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476
		/*
		 * 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(
6477
	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
L
Linus Torvalds 已提交
6478 6479 6480
{
	struct sctp_bind_bucket *pp;

6481
	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
L
Linus Torvalds 已提交
6482
	if (pp) {
6483
		SCTP_DBG_OBJCNT_INC(bind_bucket);
L
Linus Torvalds 已提交
6484 6485 6486
		pp->port = snum;
		pp->fastreuse = 0;
		INIT_HLIST_HEAD(&pp->owner);
6487
		pp->net = net;
6488
		hlist_add_head(&pp->node, &head->chain);
L
Linus Torvalds 已提交
6489 6490 6491 6492 6493 6494 6495
	}
	return pp;
}

/* Caller must hold hashbucket lock for this tb with local BH disabled */
static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
{
6496
	if (pp && hlist_empty(&pp->owner)) {
6497
		__hlist_del(&pp->node);
L
Linus Torvalds 已提交
6498 6499 6500 6501 6502 6503 6504 6505 6506
		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 =
6507 6508
		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
						  inet_sk(sk)->inet_num)];
L
Linus Torvalds 已提交
6509 6510
	struct sctp_bind_bucket *pp;

6511
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
6512 6513 6514
	pp = sctp_sk(sk)->bind_hash;
	__sk_del_bind_node(sk);
	sctp_sk(sk)->bind_hash = NULL;
E
Eric Dumazet 已提交
6515
	inet_sk(sk)->inet_num = 0;
L
Linus Torvalds 已提交
6516
	sctp_bucket_destroy(pp);
6517
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
6518 6519 6520 6521
}

void sctp_put_port(struct sock *sk)
{
6522
	local_bh_disable();
L
Linus Torvalds 已提交
6523
	__sctp_put_port(sk);
6524
	local_bh_enable();
L
Linus Torvalds 已提交
6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536
}

/*
 * 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
6537
	__be16 port;
L
Linus Torvalds 已提交
6538 6539 6540 6541

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

E
Eric Dumazet 已提交
6542
	port = htons(inet_sk(sk)->inet_num);
L
Linus Torvalds 已提交
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 6579 6580 6581 6582 6583 6584 6585 6586
	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
 */
6587
static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
L
Linus Torvalds 已提交
6588 6589
{
	struct cmsghdr *cmsg;
6590
	struct msghdr *my_msg = (struct msghdr *)msg;
L
Linus Torvalds 已提交
6591

6592
	for_each_cmsghdr(cmsg, my_msg) {
6593
		if (!CMSG_OK(my_msg, cmsg))
L
Linus Torvalds 已提交
6594 6595 6596 6597 6598 6599 6600 6601 6602 6603
			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
6604
			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
L
Linus Torvalds 已提交
6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615
			 *
			 * 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
			 */
6616
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
L
Linus Torvalds 已提交
6617
				return -EINVAL;
6618 6619

			cmsgs->init = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
6620 6621 6622 6623
			break;

		case SCTP_SNDRCV:
			/* SCTP Socket API Extension
6624
			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
L
Linus Torvalds 已提交
6625 6626 6627 6628 6629 6630 6631 6632 6633
			 *
			 * 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
			 */
6634
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
L
Linus Torvalds 已提交
6635 6636
				return -EINVAL;

6637
			cmsgs->srinfo = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
6638

6639
			if (cmsgs->srinfo->sinfo_flags &
6640 6641
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
			      SCTP_ABORT | SCTP_EOF))
L
Linus Torvalds 已提交
6642 6643 6644
				return -EINVAL;
			break;

6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666
		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 |
			      SCTP_ABORT | SCTP_EOF))
				return -EINVAL;
			break;
L
Linus Torvalds 已提交
6667 6668
		default:
			return -EINVAL;
6669
		}
L
Linus Torvalds 已提交
6670
	}
6671

L
Linus Torvalds 已提交
6672 6673 6674 6675 6676 6677 6678 6679
	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.
 */
6680
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
L
Linus Torvalds 已提交
6681 6682 6683 6684
{
	int error;
	DEFINE_WAIT(wait);

E
Eric Dumazet 已提交
6685
	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716

	/* 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.
	 */
6717
	release_sock(sk);
L
Linus Torvalds 已提交
6718
	*timeo_p = schedule_timeout(*timeo_p);
6719
	lock_sock(sk);
L
Linus Torvalds 已提交
6720 6721

ready:
E
Eric Dumazet 已提交
6722
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
6723 6724 6725 6726 6727 6728
	return 0;

interrupted:
	error = sock_intr_errno(*timeo_p);

out:
E
Eric Dumazet 已提交
6729
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
6730 6731 6732 6733 6734 6735 6736 6737
	*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.
 */
6738 6739
struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
				       int noblock, int *err)
L
Linus Torvalds 已提交
6740 6741 6742 6743 6744 6745 6746
{
	int error;
	struct sk_buff *skb;
	long timeo;

	timeo = sock_rcvtimeo(sk, noblock);

6747 6748
	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
		 MAX_SCHEDULE_TIMEOUT);
L
Linus Torvalds 已提交
6749 6750 6751 6752 6753 6754 6755

	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...
6756
		 *  However, this function was correct in any case. 8)
L
Linus Torvalds 已提交
6757 6758
		 */
		if (flags & MSG_PEEK) {
6759
			spin_lock_bh(&sk->sk_receive_queue.lock);
L
Linus Torvalds 已提交
6760 6761 6762
			skb = skb_peek(&sk->sk_receive_queue);
			if (skb)
				atomic_inc(&skb->users);
6763
			spin_unlock_bh(&sk->sk_receive_queue.lock);
L
Linus Torvalds 已提交
6764 6765 6766 6767 6768 6769 6770
		} else {
			skb = skb_dequeue(&sk->sk_receive_queue);
		}

		if (skb)
			return skb;

6771 6772 6773 6774 6775
		/* 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
6776 6777 6778
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;

6779 6780 6781 6782
		if (sk_can_busy_loop(sk) &&
		    sk_busy_loop(sk, noblock))
			continue;

L
Linus Torvalds 已提交
6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800
		/* 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;

6801 6802 6803 6804 6805
	if (sctp_wspace(asoc) <= 0)
		return;

	if (waitqueue_active(&asoc->wait))
		wake_up_interruptible(&asoc->wait);
L
Linus Torvalds 已提交
6806

6807 6808
	if (sctp_writeable(sk)) {
		struct socket_wq *wq;
6809

6810 6811 6812 6813 6814
		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
6815 6816 6817 6818 6819

			/* 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.
			 */
6820
			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6821
				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
6822
		}
6823
		rcu_read_unlock();
L
Linus Torvalds 已提交
6824 6825 6826
	}
}

6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837
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);

6838 6839 6840 6841 6842 6843
	/* If association goes down and is just flushing its
	 * outq, then just normally notify others.
	 */
	if (asoc->base.dead)
		return sctp_write_space(sk);

6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866
	/* 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
6867 6868 6869 6870 6871 6872
/* 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)
{
6873 6874 6875
	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
6876

6877 6878 6879 6880 6881 6882
	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);

6883
	/*
6884
	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6885 6886
	 */
	sk->sk_wmem_queued   -= skb->truesize;
6887
	sk_mem_uncharge(sk, skb->truesize);
6888

6889
	sock_wfree(skb);
6890
	sctp_wake_up_waiters(sk, asoc);
L
Linus Torvalds 已提交
6891 6892 6893 6894

	sctp_association_put(asoc);
}

6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905
/* 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);
6906 6907

	/*
6908
	 * Mimic the behavior of sock_rfree
6909
	 */
6910
	sk_mem_uncharge(sk, event->rmem_len);
6911 6912 6913
}


L
Linus Torvalds 已提交
6914 6915 6916 6917 6918 6919 6920 6921 6922
/* 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);

6923 6924
	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
		 *timeo_p, msg_len);
L
Linus Torvalds 已提交
6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945

	/* 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.
		 */
6946
		release_sock(sk);
L
Linus Torvalds 已提交
6947
		current_timeo = schedule_timeout(current_timeo);
6948
		BUG_ON(sk != asoc->base.sk);
6949
		lock_sock(sk);
L
Linus Torvalds 已提交
6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973 6974

		*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;
}

6975
void sctp_data_ready(struct sock *sk)
6976
{
6977 6978 6979 6980 6981 6982
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
		wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6983 6984
						POLLRDNORM | POLLRDBAND);
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6985
	rcu_read_unlock();
6986 6987
}

L
Linus Torvalds 已提交
6988 6989 6990 6991 6992 6993
/* 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.  */
6994
	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
L
Linus Torvalds 已提交
6995 6996 6997 6998 6999 7000
		__sctp_write_space(asoc);
	}
}

/* Is there any sndbuf space available on the socket?
 *
7001
 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
L
Linus Torvalds 已提交
7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013
 * 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;

7014
	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
L
Linus Torvalds 已提交
7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029
	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);

7030
	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
L
Linus Torvalds 已提交
7031 7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053

	/* 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.
		 */
7054
		release_sock(sk);
L
Linus Torvalds 已提交
7055
		current_timeo = schedule_timeout(current_timeo);
7056
		lock_sock(sk);
L
Linus Torvalds 已提交
7057 7058 7059 7060 7061 7062 7063 7064 7065 7066 7067 7068 7069

		*timeo_p = current_timeo;
	}

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

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

	return err;

do_error:
7070
	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
L
Linus Torvalds 已提交
7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093 7094
		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
7095
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
L
Linus Torvalds 已提交
7096 7097 7098
					  TASK_INTERRUPTIBLE);

		if (list_empty(&ep->asocs)) {
7099
			release_sock(sk);
L
Linus Torvalds 已提交
7100
			timeo = schedule_timeout(timeo);
7101
			lock_sock(sk);
L
Linus Torvalds 已提交
7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112 7113 7114 7115 7116 7117 7118 7119 7120
		}

		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
7121
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7122 7123 7124 7125

	return err;
}

7126
static void sctp_wait_for_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
7127 7128 7129 7130
{
	DEFINE_WAIT(wait);

	do {
E
Eric Dumazet 已提交
7131
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7132 7133
		if (list_empty(&sctp_sk(sk)->ep->asocs))
			break;
7134
		release_sock(sk);
L
Linus Torvalds 已提交
7135
		timeout = schedule_timeout(timeout);
7136
		lock_sock(sk);
L
Linus Torvalds 已提交
7137 7138
	} while (!signal_pending(current) && timeout);

E
Eric Dumazet 已提交
7139
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7140 7141
}

7142 7143 7144 7145 7146 7147 7148 7149
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. */
7150
	skb_walk_frags(skb, frag)
7151 7152 7153 7154 7155 7156
		sctp_skb_set_owner_r_frag(frag, sk);

done:
	sctp_skb_set_owner_r(skb, sk);
}

7157 7158 7159 7160
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
7161
	struct inet_sock *newinet;
7162 7163 7164 7165

	newsk->sk_type = sk->sk_type;
	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
	newsk->sk_flags = sk->sk_flags;
7166
	newsk->sk_tsflags = sk->sk_tsflags;
7167 7168
	newsk->sk_no_check_tx = sk->sk_no_check_tx;
	newsk->sk_no_check_rx = sk->sk_no_check_rx;
7169 7170 7171
	newsk->sk_reuse = sk->sk_reuse;

	newsk->sk_shutdown = sk->sk_shutdown;
7172
	newsk->sk_destruct = sctp_destruct_sock;
7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185 7186
	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;

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
E
Eric Dumazet 已提交
7187 7188 7189 7190
	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);
7191
	newinet->pmtudisc = inet->pmtudisc;
E
Eric Dumazet 已提交
7192
	newinet->inet_id = asoc->next_tsn ^ jiffies;
7193 7194 7195 7196 7197 7198

	newinet->uc_ttl = inet->uc_ttl;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;
7199 7200 7201

	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
		net_enable_timestamp();
7202 7203
}

7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216
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
7217 7218 7219 7220 7221 7222 7223 7224 7225 7226 7227 7228 7229
/* 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;
7230
	struct sctp_bind_hashbucket *head;
L
Linus Torvalds 已提交
7231 7232 7233 7234 7235 7236 7237

	/* 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. */
7238
	sctp_copy_descendant(newsk, oldsk);
L
Linus Torvalds 已提交
7239 7240 7241 7242 7243 7244 7245 7246

	/* 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. */
7247 7248
	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
						 inet_sk(oldsk)->inet_num)];
7249
	local_bh_disable();
7250
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
7251 7252 7253
	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
7254
	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7255
	spin_unlock(&head->lock);
7256
	local_bh_enable();
L
Linus Torvalds 已提交
7257

7258 7259 7260
	/* Copy the bind_addr list from the original endpoint to the new
	 * endpoint so that we can handle restarts properly
	 */
7261 7262
	sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
				&oldsp->ep->base.bind_addr, GFP_KERNEL);
7263

L
Linus Torvalds 已提交
7264 7265 7266 7267 7268 7269
	/* 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
7270
			__skb_unlink(skb, &oldsk->sk_receive_queue);
L
Linus Torvalds 已提交
7271
			__skb_queue_tail(&newsk->sk_receive_queue, skb);
7272
			sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
7273 7274 7275 7276 7277 7278 7279 7280 7281 7282
		}
	}

	/* 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);
7283
	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
L
Linus Torvalds 已提交
7284

7285
	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
L
Linus Torvalds 已提交
7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299
		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
7300
				__skb_unlink(skb, &oldsp->pd_lobby);
L
Linus Torvalds 已提交
7301
				__skb_queue_tail(queue, skb);
7302
				sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
7303 7304 7305 7306 7307 7308 7309
			}
		}

		/* Clear up any skbs waiting for the partial
		 * delivery to finish.
		 */
		if (assoc->ulpq.pd_mode)
7310
			sctp_clear_pd(oldsk, NULL);
L
Linus Torvalds 已提交
7311 7312 7313

	}

7314
	sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7315 7316
		sctp_skb_set_owner_r_frag(skb, newsk);

7317
	sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7318 7319
		sctp_skb_set_owner_r_frag(skb, newsk);

L
Linus Torvalds 已提交
7320 7321 7322 7323 7324 7325
	/* 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;

7326 7327 7328 7329 7330
	/* 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.
7331 7332 7333
	 *
	 * The caller has just allocated newsk so we can guarantee that other
	 * paths won't try to lock it and then oldsk.
7334
	 */
7335
	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
7336 7337 7338 7339 7340 7341 7342 7343 7344
	sctp_assoc_migrate(assoc, newsk);

	/* If the association on the newsk is already closed before accept()
	 * is called, set RCV_SHUTDOWN flag.
	 */
	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
		newsk->sk_shutdown |= RCV_SHUTDOWN;

	newsk->sk_state = SCTP_SS_ESTABLISHED;
7345
	release_sock(newsk);
L
Linus Torvalds 已提交
7346 7347
}

7348

L
Linus Torvalds 已提交
7349 7350 7351 7352 7353 7354 7355 7356 7357 7358 7359 7360 7361 7362 7363 7364 7365 7366 7367 7368 7369 7370
/* 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),
7371 7372 7373 7374 7375 7376
	.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,
7377
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
7378 7379
};

E
Eric Dumazet 已提交
7380
#if IS_ENABLED(CONFIG_IPV6)
7381

7382 7383 7384 7385 7386 7387 7388
#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
7389 7390 7391 7392 7393 7394 7395 7396 7397
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,
7398
	.destroy	= sctp_v6_destroy_sock,
L
Linus Torvalds 已提交
7399 7400 7401 7402 7403 7404 7405 7406 7407 7408 7409
	.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),
7410 7411 7412 7413 7414 7415
	.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,
7416
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
7417
};
E
Eric Dumazet 已提交
7418
#endif /* IS_ENABLED(CONFIG_IPV6) */