/kernel/linux-source-2.6.32/net/sctp-sagun/socket.c
C | 5844 lines | 3405 code | 770 blank | 1669 comment | 717 complexity | 982df8de0402b6bcab346ae90f5111d9 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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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/types.h>
- #include <linux/kernel.h>
- #include <linux/wait.h>
- #include <linux/time.h>
- #include <linux/ip.h>
- #include <linux/capability.h>
- #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;
- extern int sysctl_sctp_mem[3];
- extern int sysctl_sctp_rmem[3];
- extern int sysctl_sctp_wmem[3];
- int sctp_memory_pressure;
- atomic_t sctp_memory_allocated;
- atomic_t sctp_sockets_allocated;
-
- static void sctp_enter_memory_pressure(void)
- {
- sctp_memory_pressure = 1;
- }
- /* Get the sndbuf space available at the time on the association. */
- static inline int sctp_wspace(struct sctp_association *asoc)
- {
- int amt;
- struct sock *sk = asoc->base.sk;
- if (asoc->ep->sndbuf_policy)
- amt = asoc->sndbuf_used;
- else
- amt = atomic_read(&sk->sk_wmem_alloc);
- if (amt >= sk->sk_sndbuf) {
- if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
- amt = 0;
- else {
- amt = sk_stream_wspace(sk);
- if (amt < 0)
- amt = 0;
- }
- } else {
- amt = sk->sk_sndbuf - amt;
- }
-
- 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);
- sk->sk_wmem_queued += chunk->skb->truesize;
- sk_mem_charge(sk, chunk->skb->truesize);
- }
- /* 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), NULL))
- 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;
- laddr->v4.sin_port = ntohs(laddr->v4.sin_port);
- addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
- (union sctp_addr *)addr,
- &transport);
- laddr->v4.sin_port = htons(laddr->v4.sin_port);
- if (!addr_asoc)
- return NULL;
- id_asoc = sctp_id2assoc(sk, id);
- if (id_asoc && (id_asoc != addr_asoc))
- return NULL;
- sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
- (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.
- */
- SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
- {
- int retval = 0;
- sctp_lock_sock(sk);
- SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
- sk, addr, addr_len);
- /* Disallow binding twice. */
- if (!sctp_sk(sk)->ep->base.bind_addr.port)
- retval = sctp_do_bind(sk, (union sctp_addr *)addr,
- addr_len);
- else
- retval = -EINVAL;
- sctp_release_sock(sk);
- 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;
- /* Does this PF support this AF? */
- if (!opt->pf->af_supported(addr->sa.sa_family, opt))
- return NULL;
- /* 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. */
- SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
- {
- 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);
- if (!af) {
- SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
- sk, addr, len);
- return -EINVAL;
- }
- snum = ntohs(addr->v4.sin_port);
- SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
- ", port: %d, new port: %d, len: %d)\n",
- sk,
- addr,
- bp->port, snum,
- len);
- /* PF specific bind() address verification. */
- if (!sp->pf->bind_verify(sp, addr))
- return -EADDRNOTAVAIL;
- /* We must either be unbound, or bind to the same port. */
- if (bp->port && (snum != bp->port)) {
- SCTP_DEBUG_PRINTK("sctp_do_bind:"
- " New port %d does not match existing port "
- "%d.\n", snum, bp->port);
- return -EINVAL;
- }
- if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
- return -EACCES;
- /* Make sure we are allowed to bind here.
- * The function sctp_get_port_local() does duplicate address
- * detection.
- */
- if ((ret = sctp_get_port_local(sk, addr))) {
- if (ret == (long) sk) {
- /* This endpoint has a conflicting address. */
- return -EINVAL;
- } else {
- return -EADDRINUSE;
- } }
- /* Refresh ephemeral port. */
- if (!bp->port)
- bp->port = inet_sk(sk)->num;
- /* Add the address to the bind address list. */
- sctp_local_bh_disable();
- sctp_write_lock(&ep->base.addr_lock);
- /* Use GFP_ATOMIC since BHs are disabled. */
- addr->v4.sin_port = ntohs(addr->v4.sin_port);
- ret = sctp_add_bind_addr(bp, addr, 1, GFP_ATOMIC);
- addr->v4.sin_port = htons(addr->v4.sin_port);
- sctp_write_unlock(&ep->base.addr_lock);
- sctp_local_bh_enable();
- /* Copy back into socket for getsockname() use. */
- if (!ret) {
- inet_sk(sk)->sport = htons(inet_sk(sk)->num);
- af->to_sk_saddr(addr, sk);
- }
- return ret;
- }
- /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
- *
- * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
- * at any one time. If a sender, after sending an ASCONF chunk, decides
- * it needs to transfer another ASCONF Chunk, it MUST wait until the
- * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
- * subsequent ASCONF. Note this restriction binds each side, so at any
- * time two ASCONF may be in-transit on any given association (one sent
- * from each endpoint).
- */
- static int sctp_send_asconf(struct sctp_association *asoc,
- struct sctp_chunk *chunk)
- {
- int retval = 0;
- /* If there is an outstanding ASCONF chunk, queue it for later
- * transmission.
- */
- if (asoc->addip_last_asconf) {
- list_add_tail(&chunk->list, &asoc->addip_chunk_list);
- goto out;
- }
- /* Hold the chunk until an ASCONF_ACK is received. */
- sctp_chunk_hold(chunk);
- retval = sctp_primitive_ASCONF(asoc, chunk);
- 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.
- */
- int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
- {
- int cnt;
- int retval = 0;
- void *addr_buf;
- struct sockaddr *sa_addr;
- struct sctp_af *af;
- SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
- sk, addrs, addrcnt);
- 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.
- */
- sa_addr = (struct sockaddr *)addr_buf;
- af = sctp_get_af_specific(sa_addr->sa_family);
- if (!af) {
- retval = -EINVAL;
- goto err_bindx_add;
- }
- retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
- 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.
- *
- * If any of the addresses is already in the bind address list of the
- * 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_add_ip(struct sock *sk,
- struct sockaddr *addrs,
- int addrcnt)
- {
- 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;
- union sctp_addr saveaddr;
- void *addr_buf;
- struct sctp_af *af;
- struct list_head *pos;
- struct list_head *p;
- int i;
- int retval = 0;
- if (!sctp_addip_enable)
- return retval;
- sp = sctp_sk(sk);
- ep = sp->ep;
- SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
- __FUNCTION__, sk, addrs, addrcnt);
- list_for_each(pos, &ep->asocs) {
- asoc = list_entry(pos, struct sctp_association, asocs);
- 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
- * in the bind address list of the association. 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++) {
- addr = (union sctp_addr *)addr_buf;
- 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;
- /* Use the first address in bind addr list of association as
- * Address Parameter of ASCONF CHUNK.
- */
- sctp_read_lock(&asoc->base.addr_lock);
- bp = &asoc->base.bind_addr;
- p = bp->address_list.next;
- laddr = list_entry(p, struct sctp_sockaddr_entry, list);
- sctp_read_unlock(&asoc->base.addr_lock);
- chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
- addrcnt, SCTP_PARAM_ADD_IP);
- if (!chunk) {
- retval = -ENOMEM;
- goto out;
- }
- retval = sctp_send_asconf(asoc, chunk);
- if (retval)
- goto out;
- /* Add the new addresses to the bind address list with
- * use_as_src set to 0.
- */
- sctp_local_bh_disable();
- sctp_write_lock(&asoc->base.addr_lock);
- addr_buf = addrs;
- for (i = 0; i < addrcnt; i++) {
- addr = (union sctp_addr *)addr_buf;
- af = sctp_get_af_specific(addr->v4.sin_family);
- memcpy(&saveaddr, addr, af->sockaddr_len);
- saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
- retval = sctp_add_bind_addr(bp, &saveaddr, 0,
- GFP_ATOMIC);
- addr_buf += af->sockaddr_len;
- }
- sctp_write_unlock(&asoc->base.addr_lock);
- sctp_local_bh_enable();
- }
- 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.
- */
- int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
- {
- 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;
- union sctp_addr saveaddr;
- void *addr_buf;
- struct sockaddr *sa_addr;
- struct sctp_af *af;
- SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
- sk, addrs, addrcnt);
- 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;
- }
- /* The list may contain either IPv4 or IPv6 address;
- * determine the address length to copy the address to
- * saveaddr.
- */
- sa_addr = (struct sockaddr *)addr_buf;
- af = sctp_get_af_specific(sa_addr->sa_family);
- if (!af) {
- retval = -EINVAL;
- goto err_bindx_rem;
- }
- memcpy(&saveaddr, sa_addr, af->sockaddr_len);
- saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
- if (saveaddr.v4.sin_port != bp->port) {
- retval = -EINVAL;
- goto err_bindx_rem;
- }
- /* 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
- */
- sctp_local_bh_disable();
- sctp_write_lock(&ep->base.addr_lock);
- retval = sctp_del_bind_addr(bp, &saveaddr);
- sctp_write_unlock(&ep->base.addr_lock);
- sctp_local_bh_enable();
- 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.
- *
- * If any of the addresses is already in the bind address list of the
- * 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)
- {
- struct sctp_sock *sp;
- struct sctp_endpoint *ep;
- struct sctp_association *asoc;
- struct sctp_transport *transport;
- struct sctp_bind_addr *bp;
- struct sctp_chunk *chunk;
- union sctp_addr *laddr;
- union sctp_addr saveaddr;
- void *addr_buf;
- struct sctp_af *af;
- struct list_head *pos, *pos1;
- struct sctp_sockaddr_entry *saddr;
- int i;
- int retval = 0;
- if (!sctp_addip_enable)
- return retval;
- sp = sctp_sk(sk);
- ep = sp->ep;
- SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
- __FUNCTION__, sk, addrs, addrcnt);
- list_for_each(pos, &ep->asocs) {
- asoc = list_entry(pos, struct sctp_association, asocs);
- 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
- * not present in the bind address list of the association.
- * 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++) {
- laddr = (union sctp_addr *)addr_buf;
- 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.
- */
- sctp_read_lock(&asoc->base.addr_lock);
- bp = &asoc->base.bind_addr;
- laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
- addrcnt, sp);
- sctp_read_unlock(&asoc->base.addr_lock);
- if (!laddr)
- continue;
- chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
- SCTP_PARAM_DEL_IP);
- if (!chunk) {
- retval = -ENOMEM;
- goto out;
- }
- /* Reset use_as_src flag for the addresses in the bind address
- * list that are to be deleted.
- */
- sctp_local_bh_disable();
- sctp_write_lock(&asoc->base.addr_lock);
- addr_buf = addrs;
- for (i = 0; i < addrcnt; i++) {
- laddr = (union sctp_addr *)addr_buf;
- af = sctp_get_af_specific(laddr->v4.sin_family);
- memcpy(&saveaddr, laddr, af->sockaddr_len);
- saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
- list_for_each(pos1, &bp->address_list) {
- saddr = list_entry(pos1,
- struct sctp_sockaddr_entry,
- list);
- if (sctp_cmp_addr_exact(&saddr->a, &saveaddr))
- saddr->use_as_src = 0;
- }
- addr_buf += af->sockaddr_len;
- }
- sctp_write_unlock(&asoc->base.addr_lock);
- sctp_local_bh_enable();
- /* 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.
- */
- list_for_each(pos1, &asoc->peer.transport_addr_list) {
- transport = list_entry(pos1, struct sctp_transport,
- transports);
- dst_release(transport->dst);
- sctp_transport_route(transport, NULL,
- sctp_sk(asoc->base.sk));
- }
- retval = sctp_send_asconf(asoc, chunk);
- }
- out:
- return retval;
- }
- /* 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
- * 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.
- *
- * 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.
- * This is used for tunneling the sctp_bindx() 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
- * op Operation to perform (add or remove, see the flags of
- * sctp_bindx)
- *
- * Returns 0 if ok, <0 errno code on error.
- */
- SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
- struct sockaddr __user *addrs,
- int addrs_size, int op)
- {
- struct sockaddr *kaddrs;
- int err;
- int addrcnt = 0;
- int walk_size = 0;
- struct sockaddr *sa_addr;
- void *addr_buf;
- struct sctp_af *af;
- SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
- " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
- 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. */
- kaddrs = kmalloc(addrs_size, GFP_KERNEL);
- if (unlikely(!kaddrs))
- return -ENOMEM;
- if (__copy_from_user(kaddrs, addrs, addrs_size)) {
- kfree(kaddrs);
- return -EFAULT;
- }
- /* Walk through the addrs buffer and count the number of addresses. */
- addr_buf = kaddrs;
- while (walk_size < addrs_size) {
- sa_addr = (struct sockaddr *)addr_buf;
- 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.
- */
- 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;
- };
- out:
- kfree(kaddrs);
- return err;
- }
- /* __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.
- */
- static int __sctp_connect(struct sock* sk,
- struct sockaddr *kaddrs,
- int addrs_size)
- {
- 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;
- struct sctp_af *af;
- sctp_scope_t scope;
- long timeo;
- int err = 0;
- int addrcnt = 0;
- int walk_size = 0;
- struct sockaddr *sa_addr;
- void *addr_buf;
- 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) {
- sa_addr = (struct sockaddr *)addr_buf;
- 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.
- */
- if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
- err = -EINVAL;
- goto out_free;
- }
- err = sctp_verify_addr(sk, (union sctp_addr *)sa_addr,
- af->sockaddr_len);
- if (err)
- goto out_free;
- memcpy(&to, sa_addr, af->sockaddr_len);
- to.v4.sin_port = ntohs(to.v4.sin_port);
- /* Check if there already is a matching association on the
- * endpoint (other than the one created here).
- */
- asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
- 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.
- */
- if (sctp_endpoint_is_peeled_off(ep, &to)) {
- 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;
- }
- } else {
- /*
- * 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
- * be permitted to open new associations.
- */
- if (ep->base.bind_addr.port < PROT_SOCK &&
- !capable(CAP_NET_BIND_SERVICE)) {
- err = -EACCES;
- goto out_free;
- }
- }
- scope = sctp_scope(&to);
- asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
- if (!asoc) {
- err = -ENOMEM;
- goto out_free;
- }
- }
- /* Prime the peer's transport structures. */
- transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
- SCTP_UNKNOWN);
- if (!transport) {
- err = -ENOMEM;
- goto out_free;
- }
- addrcnt++;
- addr_buf += af->sockaddr_len;
- walk_size += af->sockaddr_len;
- }
- err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
- if (err < 0) {
- goto out_free;
- }
- err = sctp_primitive_ASSOCIATE(asoc, NULL);
- if (err < 0) {
- goto out_free;
- }
- /* Initialize sk's dport and daddr for getpeername() */
- inet_sk(sk)->dport = htons(asoc->peer.port);
- af = sctp_get_af_specific(to.sa.sa_family);
- af->to_sk_daddr(&to, sk);
- sk->sk_err = 0;
- timeo = sock_sndtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
- err = sctp_wait_for_connect(asoc, &timeo);
- /* Don't free association on exit. */
- asoc = NULL;
- out_free:
- SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
- " kaddrs: %p err: %d\n",
- asoc, kaddrs, err);
- if (asoc)
- sctp_association_free(asoc);
- return err;
- }
- /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
- *
- * API 8.9
- * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
- *
- * 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.
- *
- * On success, sctp_connectx() returns 0. On failure, sctp_connectx() 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_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
- * the association is implementation dependant. This function only
- * 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
- *
- * Returns 0 if ok, <0 errno code on error.
- */
- SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
- struct sockaddr __user *addrs,
- int addrs_size)
- {
- int err = 0;
- struct sockaddr *kaddrs;
- SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
- __FUNCTION__, sk, addrs, addrs_size);
- 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. */
- kaddrs = kmalloc(addrs_size, GFP_KERNEL);
- if (unlikely(!kaddrs))
- return -ENOMEM;
- if (__copy_from_user(kaddrs, addrs, addrs_size)) {
- err = -EFAULT;
- } else {
- err = __sctp_connect(sk, kaddrs, addrs_size);
- }
- kfree(kaddrs);
- return err;
- }
- /* 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.
- */
- SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
- {
- struct sctp_endpoint *ep;
- struct sctp_association *asoc;
- struct list_head *pos, *temp;
- SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
- sctp_lock_sock(sk);
- sk->sk_shutdown = SHUTDOWN_MASK;
- ep = sctp_sk(sk)->ep;
- /* Walk all associations on an endpoint. */
- 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);
- continue;
- }
- }
- if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
- struct sctp_chunk *chunk;
- chunk = sctp_make_abort_user(asoc, NULL, 0);
- if (chunk)
- sctp_primitive_ABORT(asoc, chunk);
- } else
- sctp_primitive_SHUTDOWN(asoc, NULL);
- }
- /* Clean up any skbs sitting on the receive queue. */
- sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
- sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
- /* 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. */
- sctp_release_sock(sk);
- /* Supposedly, no process has access to the socket, but
- * the net layers still may.
- */
- sctp_local_bh_disable();
- sctp_bh_lock_sock(sk);
- /* 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);
- sctp_bh_unlock_sock(sk);
- sctp_local_bh_enable();
- 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(). */
- SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
- SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
- struct msghdr *msg, size_t msg_len)
- {
- struct sctp_sock *sp;
- struct sctp_endpoint *ep;
- struct sctp_association *new_asoc=NULL, *asoc=NULL;
- struct sctp_transport *transport, *chunk_tp;
- struct sctp_chunk *chunk;
- union sctp_addr to;
- struct sockaddr *msg_name = NULL;
- struct sctp_sndrcvinfo default_sinfo = { 0 };
- struct sctp_sndrcvinfo *sinfo;
- struct sctp_initmsg *sinit;
- sctp_assoc_t associd = 0;
- sctp_cmsgs_t cmsgs = { NULL };
- int err;
- sctp_scope_t scope;
- long timeo;
- __u16 sinfo_flags = 0;
- struct sctp_datamsg *datamsg;
- struct list_head *pos;
- int msg_flags = msg->msg_flags;
- SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
- sk, msg, msg_len);
- err = 0;
- sp = sctp_sk(sk);
- ep = sp->ep;
- SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
- /* 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) {
- SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
- 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);
- SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
- "0x%x:%u.\n",
- to.v4.sin_addr.s_addr, to.v4.sin_port);
- to.v4.sin_port = ntohs(to.v4.sin_port);
- msg_name = msg->msg_name;
- }
- sinfo = cmsgs.info;
- sinit = cmsgs.init;
- /* Did the user specify SNDRCVINFO? */
- if (sinfo) {
- sinfo_flags = sinfo->sinfo_flags;
- associd = sinfo->sinfo_assoc_id;
- }
- SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
- msg_len, sinfo_flags);
- /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
- if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
- err = -EINVAL;
- goto out_nounlock;
- }
- /* 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
- * the msg_iov set to the user abort reason.
- */
- if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
- (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
- err = -EINVAL;
- goto out_nounlock;
- }
- /* If SCTP_ADDR_OVER is set, there must be an address
- * specified in msg_name.
- */
- if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
- err = -EINVAL;
- goto out_nounlock;
- }
- transport = NULL;
- SCTP_DEBUG_PRINTK("About to look up association.\n");
- sctp_lock_sock(sk);
- /* If a msg_name has been specified, assume this is to be used. */
- if (msg_name) {
- /* Look for a matching association on the endpoint. */
- asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
- 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)) ||
- sctp_endpoint_is_peeled_off(ep, &to)) {
- err = -EADDRNOTAVAIL;
- goto out_unlock;
- }
- }
- } else {
- asoc = sctp_id2assoc(sk, associd);
- if (!asoc) {
- err = -EPIPE;
- goto out_unlock;
- }
- }
- if (asoc) {
- SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
- /* 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;
- }
- if (sinfo_flags & SCTP_EOF) {
- SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
- asoc);
- sctp_primitive_SHUTDOWN(asoc, NULL);
- err = 0;
- goto out_unlock;
- }
- if (sinfo_flags & SCTP_ABORT) {
- struct sctp_chunk *chunk;
- chunk = sctp_make_abort_user(asoc, msg, msg_len);
- if (!chunk) {
- err = -ENOMEM;
- goto out_unlock;
- }
- SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
- sctp_primitive_ABORT(asoc, chunk);
- err = 0;
- goto out_unlock;
- }
- }
- /* Do we need to create the association? */
- if (!asoc) {
- SCTP_DEBUG_PRINTK("There is no association yet.\n");
- if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
- err = -EINVAL;
- goto out_unlock;
- }
- /* Check for invalid stream against the stream counts,
- * either the default or the user specified stream counts.
- */
- if (sinfo) {
- if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
- /* 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;
- }
- } 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 &&
- !capable(CAP_NET_BIND_SERVICE)) {
- err = -EACCES;
- goto out_unlock;
- }
- }
- 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;
- /* 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) {
- asoc->max_init_timeo =
- msecs_to_jiffies(sinit->sinit_max_init_timeo);
- }
- }
- /* Prime the peer's transport structures. */
- transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
- if (!transport) {
- err = -ENOMEM;
- goto out_free;
- }
- err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
- if (err < 0) {
- err = -ENOMEM;
- goto out_free;
- }
- }
- /* ASSERT: we have a valid association at this point. */
- SCTP_DEBUG_PRINTK("We have a valid association.\n");
- if (!sinfo) {
- /* If the user didn't specify SNDRCVINFO, make up one with
- * some defaults.
- */
- 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);
- sinfo = &default_sinfo;
- }
- /* 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;
- }
- /* 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
- …
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