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/* SCTP kernel reference Implementation
* (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
*
* This file is part of the SCTP kernel reference Implementation
*
* 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.
*
* The SCTP reference implementation is free software;
* 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.
*
* The SCTP reference implementation is distributed in the hope that it
* 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
* along with GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Please send any bug reports or fixes you make to the
* email address(es):
* lksctp developers <lksctp-developers@lists.sourceforge.net>
*
* Or submit a bug report through the following website:
* http://www.sf.net/projects/lksctp
*
* 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>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#include <linux/config.h>
#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/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
#include <linux/socket.h> /* for sa_family_t */
#include <net/sock.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
/* WARNING: Please do not remove the SCTP_STATIC attribute to
* any of the functions below as they are used to export functions
* used by a project regression testsuite.
*/
/* 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);
static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
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);
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);
static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
extern kmem_cache_t *sctp_bucket_cachep;
/* Get the sndbuf space available at the time on the association. */
static inline int sctp_wspace(struct sctp_association *asoc)
{
struct sock *sk = asoc->base.sk;
int amt = 0;
if (asoc->ep->sndbuf_policy) {
/* make sure that no association uses more than sk_sndbuf */
amt = sk->sk_sndbuf - asoc->sndbuf_used;
} else {
/* do socket level accounting */
amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
}
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);
skb_set_owner_w(chunk->skb, sk);
chunk->skb->destructor = sctp_wfree;
/* Save the chunk pointer in skb for sctp_wfree to use later. */
*((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
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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}
/* 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? */
if (!af->addr_valid(addr, sctp_sk(sk)))
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. */
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