1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
57 #include <linux/wait.h>
58 #include <linux/time.h>
60 #include <linux/capability.h>
61 #include <linux/fcntl.h>
62 #include <linux/poll.h>
63 #include <linux/init.h>
64 #include <linux/crypto.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
67 #include <linux/compat.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
74 #include <net/busy_poll.h>
76 #include <linux/socket.h> /* for sa_family_t */
77 #include <linux/export.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* Forward declarations for internal helper functions. */
83 static int sctp_writeable(struct sock *sk);
84 static void sctp_wfree(struct sk_buff *skb);
85 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
87 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
88 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
89 static int sctp_wait_for_accept(struct sock *sk, long timeo);
90 static void sctp_wait_for_close(struct sock *sk, long timeo);
91 static void sctp_destruct_sock(struct sock *sk);
92 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
93 union sctp_addr *addr, int len);
94 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
95 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
96 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
97 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf(struct sctp_association *asoc,
99 struct sctp_chunk *chunk);
100 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
101 static int sctp_autobind(struct sock *sk);
102 static void sctp_sock_migrate(struct sock *, struct sock *,
103 struct sctp_association *, sctp_socket_type_t);
105 static int sctp_memory_pressure;
106 static atomic_long_t sctp_memory_allocated;
107 struct percpu_counter sctp_sockets_allocated;
109 static void sctp_enter_memory_pressure(struct sock *sk)
111 sctp_memory_pressure = 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association *asoc)
120 if (asoc->ep->sndbuf_policy)
121 amt = asoc->sndbuf_used;
123 amt = sk_wmem_alloc_get(asoc->base.sk);
125 if (amt >= asoc->base.sk->sk_sndbuf) {
126 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
129 amt = sk_stream_wspace(asoc->base.sk);
134 amt = asoc->base.sk->sk_sndbuf - amt;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
150 struct sctp_association *asoc = chunk->asoc;
151 struct sock *sk = asoc->base.sk;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc);
156 skb_set_owner_w(chunk->skb, sk);
158 chunk->skb->destructor = sctp_wfree;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk->skb)->destructor_arg = chunk;
162 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
163 sizeof(struct sk_buff) +
164 sizeof(struct sctp_chunk);
166 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
167 sk->sk_wmem_queued += chunk->skb->truesize;
168 sk_mem_charge(sk, chunk->skb->truesize);
171 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
173 skb_orphan(chunk->skb);
176 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
177 void (*cb)(struct sctp_chunk *))
180 struct sctp_outq *q = &asoc->outqueue;
181 struct sctp_transport *t;
182 struct sctp_chunk *chunk;
184 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
185 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
188 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
191 list_for_each_entry(chunk, &q->sacked, transmitted_list)
194 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
197 list_for_each_entry(chunk, &q->out_chunk_list, list)
201 /* Verify that this is a valid address. */
202 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
207 /* Verify basic sockaddr. */
208 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
212 /* Is this a valid SCTP address? */
213 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
216 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
222 /* Look up the association by its id. If this is not a UDP-style
223 * socket, the ID field is always ignored.
225 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
227 struct sctp_association *asoc = NULL;
229 /* If this is not a UDP-style socket, assoc id should be ignored. */
230 if (!sctp_style(sk, UDP)) {
231 /* Return NULL if the socket state is not ESTABLISHED. It
232 * could be a TCP-style listening socket or a socket which
233 * hasn't yet called connect() to establish an association.
235 if (!sctp_sstate(sk, ESTABLISHED))
238 /* Get the first and the only association from the list. */
239 if (!list_empty(&sctp_sk(sk)->ep->asocs))
240 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
241 struct sctp_association, asocs);
245 /* Otherwise this is a UDP-style socket. */
246 if (!id || (id == (sctp_assoc_t)-1))
249 spin_lock_bh(&sctp_assocs_id_lock);
250 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
251 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
253 spin_unlock_bh(&sctp_assocs_id_lock);
258 /* Look up the transport from an address and an assoc id. If both address and
259 * id are specified, the associations matching the address and the id should be
262 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
263 struct sockaddr_storage *addr,
266 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
267 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
268 union sctp_addr *laddr = (union sctp_addr *)addr;
269 struct sctp_transport *transport;
271 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
274 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
281 id_asoc = sctp_id2assoc(sk, id);
282 if (id_asoc && (id_asoc != addr_asoc))
285 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
286 (union sctp_addr *)addr);
291 /* API 3.1.2 bind() - UDP Style Syntax
292 * The syntax of bind() is,
294 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
296 * sd - the socket descriptor returned by socket().
297 * addr - the address structure (struct sockaddr_in or struct
298 * sockaddr_in6 [RFC 2553]),
299 * addr_len - the size of the address structure.
301 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
307 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
310 /* Disallow binding twice. */
311 if (!sctp_sk(sk)->ep->base.bind_addr.port)
312 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
322 static long sctp_get_port_local(struct sock *, union sctp_addr *);
324 /* Verify this is a valid sockaddr. */
325 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
326 union sctp_addr *addr, int len)
330 /* Check minimum size. */
331 if (len < sizeof (struct sockaddr))
334 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
337 if (addr->sa.sa_family == AF_INET6) {
338 if (len < SIN6_LEN_RFC2133)
340 /* V4 mapped address are really of AF_INET family */
341 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
342 !opt->pf->af_supported(AF_INET, opt))
346 /* If we get this far, af is valid. */
347 af = sctp_get_af_specific(addr->sa.sa_family);
349 if (len < af->sockaddr_len)
355 static void sctp_auto_asconf_init(struct sctp_sock *sp)
357 struct net *net = sock_net(&sp->inet.sk);
359 if (net->sctp.default_auto_asconf) {
360 spin_lock(&net->sctp.addr_wq_lock);
361 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
362 spin_unlock(&net->sctp.addr_wq_lock);
363 sp->do_auto_asconf = 1;
367 /* Bind a local address either to an endpoint or to an association. */
368 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
370 struct net *net = sock_net(sk);
371 struct sctp_sock *sp = sctp_sk(sk);
372 struct sctp_endpoint *ep = sp->ep;
373 struct sctp_bind_addr *bp = &ep->base.bind_addr;
378 /* Common sockaddr verification. */
379 af = sctp_sockaddr_af(sp, addr, len);
381 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
382 __func__, sk, addr, len);
386 snum = ntohs(addr->v4.sin_port);
388 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
389 __func__, sk, &addr->sa, bp->port, snum, len);
391 /* PF specific bind() address verification. */
392 if (!sp->pf->bind_verify(sp, addr))
393 return -EADDRNOTAVAIL;
395 /* We must either be unbound, or bind to the same port.
396 * It's OK to allow 0 ports if we are already bound.
397 * We'll just inhert an already bound port in this case
402 else if (snum != bp->port) {
403 pr_debug("%s: new port %d doesn't match existing port "
404 "%d\n", __func__, snum, bp->port);
409 if (snum && snum < PROT_SOCK &&
410 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
413 /* See if the address matches any of the addresses we may have
414 * already bound before checking against other endpoints.
416 if (sctp_bind_addr_match(bp, addr, sp))
419 /* Make sure we are allowed to bind here.
420 * The function sctp_get_port_local() does duplicate address
423 addr->v4.sin_port = htons(snum);
424 if ((ret = sctp_get_port_local(sk, addr))) {
428 /* Refresh ephemeral port. */
430 bp->port = inet_sk(sk)->inet_num;
431 sctp_auto_asconf_init(sp);
434 /* Add the address to the bind address list.
435 * Use GFP_ATOMIC since BHs will be disabled.
437 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
439 /* Copy back into socket for getsockname() use. */
441 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
442 sp->pf->to_sk_saddr(addr, sk);
448 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
450 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
451 * at any one time. If a sender, after sending an ASCONF chunk, decides
452 * it needs to transfer another ASCONF Chunk, it MUST wait until the
453 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
454 * subsequent ASCONF. Note this restriction binds each side, so at any
455 * time two ASCONF may be in-transit on any given association (one sent
456 * from each endpoint).
458 static int sctp_send_asconf(struct sctp_association *asoc,
459 struct sctp_chunk *chunk)
461 struct net *net = sock_net(asoc->base.sk);
464 /* If there is an outstanding ASCONF chunk, queue it for later
467 if (asoc->addip_last_asconf) {
468 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
472 /* Hold the chunk until an ASCONF_ACK is received. */
473 sctp_chunk_hold(chunk);
474 retval = sctp_primitive_ASCONF(net, asoc, chunk);
476 sctp_chunk_free(chunk);
478 asoc->addip_last_asconf = chunk;
484 /* Add a list of addresses as bind addresses to local endpoint or
487 * Basically run through each address specified in the addrs/addrcnt
488 * array/length pair, determine if it is IPv6 or IPv4 and call
489 * sctp_do_bind() on it.
491 * If any of them fails, then the operation will be reversed and the
492 * ones that were added will be removed.
494 * Only sctp_setsockopt_bindx() is supposed to call this function.
496 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
501 struct sockaddr *sa_addr;
504 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
508 for (cnt = 0; cnt < addrcnt; cnt++) {
509 /* The list may contain either IPv4 or IPv6 address;
510 * determine the address length for walking thru the list.
513 af = sctp_get_af_specific(sa_addr->sa_family);
519 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
522 addr_buf += af->sockaddr_len;
526 /* Failed. Cleanup the ones that have been added */
528 sctp_bindx_rem(sk, addrs, cnt);
536 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
537 * associations that are part of the endpoint indicating that a list of local
538 * addresses are added to the endpoint.
540 * If any of the addresses is already in the bind address list of the
541 * association, we do not send the chunk for that association. But it will not
542 * affect other associations.
544 * Only sctp_setsockopt_bindx() is supposed to call this function.
546 static int sctp_send_asconf_add_ip(struct sock *sk,
547 struct sockaddr *addrs,
550 struct net *net = sock_net(sk);
551 struct sctp_sock *sp;
552 struct sctp_endpoint *ep;
553 struct sctp_association *asoc;
554 struct sctp_bind_addr *bp;
555 struct sctp_chunk *chunk;
556 struct sctp_sockaddr_entry *laddr;
557 union sctp_addr *addr;
558 union sctp_addr saveaddr;
565 if (!net->sctp.addip_enable)
571 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
572 __func__, sk, addrs, addrcnt);
574 list_for_each_entry(asoc, &ep->asocs, asocs) {
575 if (!asoc->peer.asconf_capable)
578 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
581 if (!sctp_state(asoc, ESTABLISHED))
584 /* Check if any address in the packed array of addresses is
585 * in the bind address list of the association. If so,
586 * do not send the asconf chunk to its peer, but continue with
587 * other associations.
590 for (i = 0; i < addrcnt; i++) {
592 af = sctp_get_af_specific(addr->v4.sin_family);
598 if (sctp_assoc_lookup_laddr(asoc, addr))
601 addr_buf += af->sockaddr_len;
606 /* Use the first valid address in bind addr list of
607 * association as Address Parameter of ASCONF CHUNK.
609 bp = &asoc->base.bind_addr;
610 p = bp->address_list.next;
611 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
612 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
613 addrcnt, SCTP_PARAM_ADD_IP);
619 /* Add the new addresses to the bind address list with
620 * use_as_src set to 0.
623 for (i = 0; i < addrcnt; i++) {
625 af = sctp_get_af_specific(addr->v4.sin_family);
626 memcpy(&saveaddr, addr, af->sockaddr_len);
627 retval = sctp_add_bind_addr(bp, &saveaddr,
628 SCTP_ADDR_NEW, GFP_ATOMIC);
629 addr_buf += af->sockaddr_len;
631 if (asoc->src_out_of_asoc_ok) {
632 struct sctp_transport *trans;
634 list_for_each_entry(trans,
635 &asoc->peer.transport_addr_list, transports) {
636 /* Clear the source and route cache */
637 dst_release(trans->dst);
638 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
639 2*asoc->pathmtu, 4380));
640 trans->ssthresh = asoc->peer.i.a_rwnd;
641 trans->rto = asoc->rto_initial;
642 sctp_max_rto(asoc, trans);
643 trans->rtt = trans->srtt = trans->rttvar = 0;
644 sctp_transport_route(trans, NULL,
645 sctp_sk(asoc->base.sk));
648 retval = sctp_send_asconf(asoc, chunk);
655 /* Remove a list of addresses from bind addresses list. Do not remove the
658 * Basically run through each address specified in the addrs/addrcnt
659 * array/length pair, determine if it is IPv6 or IPv4 and call
660 * sctp_del_bind() on it.
662 * If any of them fails, then the operation will be reversed and the
663 * ones that were removed will be added back.
665 * At least one address has to be left; if only one address is
666 * available, the operation will return -EBUSY.
668 * Only sctp_setsockopt_bindx() is supposed to call this function.
670 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
672 struct sctp_sock *sp = sctp_sk(sk);
673 struct sctp_endpoint *ep = sp->ep;
675 struct sctp_bind_addr *bp = &ep->base.bind_addr;
678 union sctp_addr *sa_addr;
681 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
682 __func__, sk, addrs, addrcnt);
685 for (cnt = 0; cnt < addrcnt; cnt++) {
686 /* If the bind address list is empty or if there is only one
687 * bind address, there is nothing more to be removed (we need
688 * at least one address here).
690 if (list_empty(&bp->address_list) ||
691 (sctp_list_single_entry(&bp->address_list))) {
697 af = sctp_get_af_specific(sa_addr->sa.sa_family);
703 if (!af->addr_valid(sa_addr, sp, NULL)) {
704 retval = -EADDRNOTAVAIL;
708 if (sa_addr->v4.sin_port &&
709 sa_addr->v4.sin_port != htons(bp->port)) {
714 if (!sa_addr->v4.sin_port)
715 sa_addr->v4.sin_port = htons(bp->port);
717 /* FIXME - There is probably a need to check if sk->sk_saddr and
718 * sk->sk_rcv_addr are currently set to one of the addresses to
719 * be removed. This is something which needs to be looked into
720 * when we are fixing the outstanding issues with multi-homing
721 * socket routing and failover schemes. Refer to comments in
722 * sctp_do_bind(). -daisy
724 retval = sctp_del_bind_addr(bp, sa_addr);
726 addr_buf += af->sockaddr_len;
729 /* Failed. Add the ones that has been removed back */
731 sctp_bindx_add(sk, addrs, cnt);
739 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
740 * the associations that are part of the endpoint indicating that a list of
741 * local addresses are removed from the endpoint.
743 * If any of the addresses is already in the bind address list of the
744 * association, we do not send the chunk for that association. But it will not
745 * affect other associations.
747 * Only sctp_setsockopt_bindx() is supposed to call this function.
749 static int sctp_send_asconf_del_ip(struct sock *sk,
750 struct sockaddr *addrs,
753 struct net *net = sock_net(sk);
754 struct sctp_sock *sp;
755 struct sctp_endpoint *ep;
756 struct sctp_association *asoc;
757 struct sctp_transport *transport;
758 struct sctp_bind_addr *bp;
759 struct sctp_chunk *chunk;
760 union sctp_addr *laddr;
763 struct sctp_sockaddr_entry *saddr;
769 if (!net->sctp.addip_enable)
775 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
776 __func__, sk, addrs, addrcnt);
778 list_for_each_entry(asoc, &ep->asocs, asocs) {
780 if (!asoc->peer.asconf_capable)
783 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
786 if (!sctp_state(asoc, ESTABLISHED))
789 /* Check if any address in the packed array of addresses is
790 * not present in the bind address list of the association.
791 * If so, do not send the asconf chunk to its peer, but
792 * continue with other associations.
795 for (i = 0; i < addrcnt; i++) {
797 af = sctp_get_af_specific(laddr->v4.sin_family);
803 if (!sctp_assoc_lookup_laddr(asoc, laddr))
806 addr_buf += af->sockaddr_len;
811 /* Find one address in the association's bind address list
812 * that is not in the packed array of addresses. This is to
813 * make sure that we do not delete all the addresses in the
816 bp = &asoc->base.bind_addr;
817 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
819 if ((laddr == NULL) && (addrcnt == 1)) {
820 if (asoc->asconf_addr_del_pending)
822 asoc->asconf_addr_del_pending =
823 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
824 if (asoc->asconf_addr_del_pending == NULL) {
828 asoc->asconf_addr_del_pending->sa.sa_family =
830 asoc->asconf_addr_del_pending->v4.sin_port =
832 if (addrs->sa_family == AF_INET) {
833 struct sockaddr_in *sin;
835 sin = (struct sockaddr_in *)addrs;
836 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
837 } else if (addrs->sa_family == AF_INET6) {
838 struct sockaddr_in6 *sin6;
840 sin6 = (struct sockaddr_in6 *)addrs;
841 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
844 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
845 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
846 asoc->asconf_addr_del_pending);
848 asoc->src_out_of_asoc_ok = 1;
856 /* We do not need RCU protection throughout this loop
857 * because this is done under a socket lock from the
860 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
868 /* Reset use_as_src flag for the addresses in the bind address
869 * list that are to be deleted.
872 for (i = 0; i < addrcnt; i++) {
874 af = sctp_get_af_specific(laddr->v4.sin_family);
875 list_for_each_entry(saddr, &bp->address_list, list) {
876 if (sctp_cmp_addr_exact(&saddr->a, laddr))
877 saddr->state = SCTP_ADDR_DEL;
879 addr_buf += af->sockaddr_len;
882 /* Update the route and saddr entries for all the transports
883 * as some of the addresses in the bind address list are
884 * about to be deleted and cannot be used as source addresses.
886 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
888 dst_release(transport->dst);
889 sctp_transport_route(transport, NULL,
890 sctp_sk(asoc->base.sk));
894 /* We don't need to transmit ASCONF */
896 retval = sctp_send_asconf(asoc, chunk);
902 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
903 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
905 struct sock *sk = sctp_opt2sk(sp);
906 union sctp_addr *addr;
909 /* It is safe to write port space in caller. */
911 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
912 af = sctp_get_af_specific(addr->sa.sa_family);
915 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
918 if (addrw->state == SCTP_ADDR_NEW)
919 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
921 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
924 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
927 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
930 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
931 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
934 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
935 * Section 3.1.2 for this usage.
937 * addrs is a pointer to an array of one or more socket addresses. Each
938 * address is contained in its appropriate structure (i.e. struct
939 * sockaddr_in or struct sockaddr_in6) the family of the address type
940 * must be used to distinguish the address length (note that this
941 * representation is termed a "packed array" of addresses). The caller
942 * specifies the number of addresses in the array with addrcnt.
944 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
945 * -1, and sets errno to the appropriate error code.
947 * For SCTP, the port given in each socket address must be the same, or
948 * sctp_bindx() will fail, setting errno to EINVAL.
950 * The flags parameter is formed from the bitwise OR of zero or more of
951 * the following currently defined flags:
953 * SCTP_BINDX_ADD_ADDR
955 * SCTP_BINDX_REM_ADDR
957 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
958 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
959 * addresses from the association. The two flags are mutually exclusive;
960 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
961 * not remove all addresses from an association; sctp_bindx() will
962 * reject such an attempt with EINVAL.
964 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
965 * additional addresses with an endpoint after calling bind(). Or use
966 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
967 * socket is associated with so that no new association accepted will be
968 * associated with those addresses. If the endpoint supports dynamic
969 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
970 * endpoint to send the appropriate message to the peer to change the
971 * peers address lists.
973 * Adding and removing addresses from a connected association is
974 * optional functionality. Implementations that do not support this
975 * functionality should return EOPNOTSUPP.
977 * Basically do nothing but copying the addresses from user to kernel
978 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
979 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
982 * We don't use copy_from_user() for optimization: we first do the
983 * sanity checks (buffer size -fast- and access check-healthy
984 * pointer); if all of those succeed, then we can alloc the memory
985 * (expensive operation) needed to copy the data to kernel. Then we do
986 * the copying without checking the user space area
987 * (__copy_from_user()).
989 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
992 * sk The sk of the socket
993 * addrs The pointer to the addresses in user land
994 * addrssize Size of the addrs buffer
995 * op Operation to perform (add or remove, see the flags of
998 * Returns 0 if ok, <0 errno code on error.
1000 static int sctp_setsockopt_bindx(struct sock *sk,
1001 struct sockaddr __user *addrs,
1002 int addrs_size, int op)
1004 struct sockaddr *kaddrs;
1008 struct sockaddr *sa_addr;
1012 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1013 __func__, sk, addrs, addrs_size, op);
1015 if (unlikely(addrs_size <= 0))
1018 /* Check the user passed a healthy pointer. */
1019 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1022 /* Alloc space for the address array in kernel memory. */
1023 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
1024 if (unlikely(!kaddrs))
1027 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1032 /* Walk through the addrs buffer and count the number of addresses. */
1034 while (walk_size < addrs_size) {
1035 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1041 af = sctp_get_af_specific(sa_addr->sa_family);
1043 /* If the address family is not supported or if this address
1044 * causes the address buffer to overflow return EINVAL.
1046 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1051 addr_buf += af->sockaddr_len;
1052 walk_size += af->sockaddr_len;
1057 case SCTP_BINDX_ADD_ADDR:
1058 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1061 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1064 case SCTP_BINDX_REM_ADDR:
1065 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1068 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1082 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1084 * Common routine for handling connect() and sctp_connectx().
1085 * Connect will come in with just a single address.
1087 static int __sctp_connect(struct sock *sk,
1088 struct sockaddr *kaddrs,
1089 int addrs_size, int flags,
1090 sctp_assoc_t *assoc_id)
1092 struct net *net = sock_net(sk);
1093 struct sctp_sock *sp;
1094 struct sctp_endpoint *ep;
1095 struct sctp_association *asoc = NULL;
1096 struct sctp_association *asoc2;
1097 struct sctp_transport *transport;
1104 union sctp_addr *sa_addr = NULL;
1106 unsigned short port;
1111 /* connect() cannot be done on a socket that is already in ESTABLISHED
1112 * state - UDP-style peeled off socket or a TCP-style socket that
1113 * is already connected.
1114 * It cannot be done even on a TCP-style listening socket.
1116 if (sctp_sstate(sk, ESTABLISHED) ||
1117 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1122 /* Walk through the addrs buffer and count the number of addresses. */
1124 while (walk_size < addrs_size) {
1127 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1133 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1135 /* If the address family is not supported or if this address
1136 * causes the address buffer to overflow return EINVAL.
1138 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1143 port = ntohs(sa_addr->v4.sin_port);
1145 /* Save current address so we can work with it */
1146 memcpy(&to, sa_addr, af->sockaddr_len);
1148 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1152 /* Make sure the destination port is correctly set
1155 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1160 /* Check if there already is a matching association on the
1161 * endpoint (other than the one created here).
1163 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1164 if (asoc2 && asoc2 != asoc) {
1165 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1172 /* If we could not find a matching association on the endpoint,
1173 * make sure that there is no peeled-off association matching
1174 * the peer address even on another socket.
1176 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1177 err = -EADDRNOTAVAIL;
1182 /* If a bind() or sctp_bindx() is not called prior to
1183 * an sctp_connectx() call, the system picks an
1184 * ephemeral port and will choose an address set
1185 * equivalent to binding with a wildcard address.
1187 if (!ep->base.bind_addr.port) {
1188 if (sctp_autobind(sk)) {
1194 * If an unprivileged user inherits a 1-many
1195 * style socket with open associations on a
1196 * privileged port, it MAY be permitted to
1197 * accept new associations, but it SHOULD NOT
1198 * be permitted to open new associations.
1200 if (ep->base.bind_addr.port < PROT_SOCK &&
1201 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1207 scope = sctp_scope(&to);
1208 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1214 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1222 /* Prime the peer's transport structures. */
1223 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1231 addr_buf += af->sockaddr_len;
1232 walk_size += af->sockaddr_len;
1235 /* In case the user of sctp_connectx() wants an association
1236 * id back, assign one now.
1239 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1244 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1249 /* Initialize sk's dport and daddr for getpeername() */
1250 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1251 sp->pf->to_sk_daddr(sa_addr, sk);
1254 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1257 *assoc_id = asoc->assoc_id;
1258 err = sctp_wait_for_connect(asoc, &timeo);
1259 /* Note: the asoc may be freed after the return of
1260 * sctp_wait_for_connect.
1263 /* Don't free association on exit. */
1267 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1268 __func__, asoc, kaddrs, err);
1271 /* sctp_primitive_ASSOCIATE may have added this association
1272 * To the hash table, try to unhash it, just in case, its a noop
1273 * if it wasn't hashed so we're safe
1275 sctp_unhash_established(asoc);
1276 sctp_association_free(asoc);
1281 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1284 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1285 * sctp_assoc_t *asoc);
1287 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1288 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1289 * or IPv6 addresses.
1291 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1292 * Section 3.1.2 for this usage.
1294 * addrs is a pointer to an array of one or more socket addresses. Each
1295 * address is contained in its appropriate structure (i.e. struct
1296 * sockaddr_in or struct sockaddr_in6) the family of the address type
1297 * must be used to distengish the address length (note that this
1298 * representation is termed a "packed array" of addresses). The caller
1299 * specifies the number of addresses in the array with addrcnt.
1301 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1302 * the association id of the new association. On failure, sctp_connectx()
1303 * returns -1, and sets errno to the appropriate error code. The assoc_id
1304 * is not touched by the kernel.
1306 * For SCTP, the port given in each socket address must be the same, or
1307 * sctp_connectx() will fail, setting errno to EINVAL.
1309 * An application can use sctp_connectx to initiate an association with
1310 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1311 * allows a caller to specify multiple addresses at which a peer can be
1312 * reached. The way the SCTP stack uses the list of addresses to set up
1313 * the association is implementation dependent. This function only
1314 * specifies that the stack will try to make use of all the addresses in
1315 * the list when needed.
1317 * Note that the list of addresses passed in is only used for setting up
1318 * the association. It does not necessarily equal the set of addresses
1319 * the peer uses for the resulting association. If the caller wants to
1320 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1321 * retrieve them after the association has been set up.
1323 * Basically do nothing but copying the addresses from user to kernel
1324 * land and invoking either sctp_connectx(). This is used for tunneling
1325 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1327 * We don't use copy_from_user() for optimization: we first do the
1328 * sanity checks (buffer size -fast- and access check-healthy
1329 * pointer); if all of those succeed, then we can alloc the memory
1330 * (expensive operation) needed to copy the data to kernel. Then we do
1331 * the copying without checking the user space area
1332 * (__copy_from_user()).
1334 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1337 * sk The sk of the socket
1338 * addrs The pointer to the addresses in user land
1339 * addrssize Size of the addrs buffer
1341 * Returns >=0 if ok, <0 errno code on error.
1343 static int __sctp_setsockopt_connectx(struct sock *sk,
1344 struct sockaddr __user *addrs,
1346 sctp_assoc_t *assoc_id)
1348 struct sockaddr *kaddrs;
1349 gfp_t gfp = GFP_KERNEL;
1350 int err = 0, flags = 0;
1352 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1353 __func__, sk, addrs, addrs_size);
1355 if (unlikely(addrs_size <= 0))
1358 /* Check the user passed a healthy pointer. */
1359 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1362 /* Alloc space for the address array in kernel memory. */
1363 if (sk->sk_socket->file)
1364 gfp = GFP_USER | __GFP_NOWARN;
1365 kaddrs = kmalloc(addrs_size, gfp);
1366 if (unlikely(!kaddrs))
1369 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1374 /* in-kernel sockets don't generally have a file allocated to them
1375 * if all they do is call sock_create_kern().
1377 if (sk->sk_socket->file)
1378 flags = sk->sk_socket->file->f_flags;
1380 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1388 * This is an older interface. It's kept for backward compatibility
1389 * to the option that doesn't provide association id.
1391 static int sctp_setsockopt_connectx_old(struct sock *sk,
1392 struct sockaddr __user *addrs,
1395 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1399 * New interface for the API. The since the API is done with a socket
1400 * option, to make it simple we feed back the association id is as a return
1401 * indication to the call. Error is always negative and association id is
1404 static int sctp_setsockopt_connectx(struct sock *sk,
1405 struct sockaddr __user *addrs,
1408 sctp_assoc_t assoc_id = 0;
1411 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1420 * New (hopefully final) interface for the API.
1421 * We use the sctp_getaddrs_old structure so that use-space library
1422 * can avoid any unnecessary allocations. The only different part
1423 * is that we store the actual length of the address buffer into the
1424 * addrs_num structure member. That way we can re-use the existing
1427 #ifdef CONFIG_COMPAT
1428 struct compat_sctp_getaddrs_old {
1429 sctp_assoc_t assoc_id;
1431 compat_uptr_t addrs; /* struct sockaddr * */
1435 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1436 char __user *optval,
1439 struct sctp_getaddrs_old param;
1440 sctp_assoc_t assoc_id = 0;
1443 #ifdef CONFIG_COMPAT
1444 if (is_compat_task()) {
1445 struct compat_sctp_getaddrs_old param32;
1447 if (len < sizeof(param32))
1449 if (copy_from_user(¶m32, optval, sizeof(param32)))
1452 param.assoc_id = param32.assoc_id;
1453 param.addr_num = param32.addr_num;
1454 param.addrs = compat_ptr(param32.addrs);
1458 if (len < sizeof(param))
1460 if (copy_from_user(¶m, optval, sizeof(param)))
1464 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1465 param.addrs, param.addr_num,
1467 if (err == 0 || err == -EINPROGRESS) {
1468 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1470 if (put_user(sizeof(assoc_id), optlen))
1477 /* API 3.1.4 close() - UDP Style Syntax
1478 * Applications use close() to perform graceful shutdown (as described in
1479 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1480 * by a UDP-style socket.
1484 * ret = close(int sd);
1486 * sd - the socket descriptor of the associations to be closed.
1488 * To gracefully shutdown a specific association represented by the
1489 * UDP-style socket, an application should use the sendmsg() call,
1490 * passing no user data, but including the appropriate flag in the
1491 * ancillary data (see Section xxxx).
1493 * If sd in the close() call is a branched-off socket representing only
1494 * one association, the shutdown is performed on that association only.
1496 * 4.1.6 close() - TCP Style Syntax
1498 * Applications use close() to gracefully close down an association.
1502 * int close(int sd);
1504 * sd - the socket descriptor of the association to be closed.
1506 * After an application calls close() on a socket descriptor, no further
1507 * socket operations will succeed on that descriptor.
1509 * API 7.1.4 SO_LINGER
1511 * An application using the TCP-style socket can use this option to
1512 * perform the SCTP ABORT primitive. The linger option structure is:
1515 * int l_onoff; // option on/off
1516 * int l_linger; // linger time
1519 * To enable the option, set l_onoff to 1. If the l_linger value is set
1520 * to 0, calling close() is the same as the ABORT primitive. If the
1521 * value is set to a negative value, the setsockopt() call will return
1522 * an error. If the value is set to a positive value linger_time, the
1523 * close() can be blocked for at most linger_time ms. If the graceful
1524 * shutdown phase does not finish during this period, close() will
1525 * return but the graceful shutdown phase continues in the system.
1527 static void sctp_close(struct sock *sk, long timeout)
1529 struct net *net = sock_net(sk);
1530 struct sctp_endpoint *ep;
1531 struct sctp_association *asoc;
1532 struct list_head *pos, *temp;
1533 unsigned int data_was_unread;
1535 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1537 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1538 sk->sk_shutdown = SHUTDOWN_MASK;
1539 sk->sk_state = SCTP_SS_CLOSING;
1541 ep = sctp_sk(sk)->ep;
1543 /* Clean up any skbs sitting on the receive queue. */
1544 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1545 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1547 /* Walk all associations on an endpoint. */
1548 list_for_each_safe(pos, temp, &ep->asocs) {
1549 asoc = list_entry(pos, struct sctp_association, asocs);
1551 if (sctp_style(sk, TCP)) {
1552 /* A closed association can still be in the list if
1553 * it belongs to a TCP-style listening socket that is
1554 * not yet accepted. If so, free it. If not, send an
1555 * ABORT or SHUTDOWN based on the linger options.
1557 if (sctp_state(asoc, CLOSED)) {
1558 sctp_unhash_established(asoc);
1559 sctp_association_free(asoc);
1564 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1565 !skb_queue_empty(&asoc->ulpq.reasm) ||
1566 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1567 struct sctp_chunk *chunk;
1569 chunk = sctp_make_abort_user(asoc, NULL, 0);
1570 sctp_primitive_ABORT(net, asoc, chunk);
1572 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1575 /* On a TCP-style socket, block for at most linger_time if set. */
1576 if (sctp_style(sk, TCP) && timeout)
1577 sctp_wait_for_close(sk, timeout);
1579 /* This will run the backlog queue. */
1582 /* Supposedly, no process has access to the socket, but
1583 * the net layers still may.
1584 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1585 * held and that should be grabbed before socket lock.
1587 spin_lock_bh(&net->sctp.addr_wq_lock);
1588 bh_lock_sock_nested(sk);
1590 /* Hold the sock, since sk_common_release() will put sock_put()
1591 * and we have just a little more cleanup.
1594 sk_common_release(sk);
1597 spin_unlock_bh(&net->sctp.addr_wq_lock);
1601 SCTP_DBG_OBJCNT_DEC(sock);
1604 /* Handle EPIPE error. */
1605 static int sctp_error(struct sock *sk, int flags, int err)
1608 err = sock_error(sk) ? : -EPIPE;
1609 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1610 send_sig(SIGPIPE, current, 0);
1614 /* API 3.1.3 sendmsg() - UDP Style Syntax
1616 * An application uses sendmsg() and recvmsg() calls to transmit data to
1617 * and receive data from its peer.
1619 * ssize_t sendmsg(int socket, const struct msghdr *message,
1622 * socket - the socket descriptor of the endpoint.
1623 * message - pointer to the msghdr structure which contains a single
1624 * user message and possibly some ancillary data.
1626 * See Section 5 for complete description of the data
1629 * flags - flags sent or received with the user message, see Section
1630 * 5 for complete description of the flags.
1632 * Note: This function could use a rewrite especially when explicit
1633 * connect support comes in.
1635 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1637 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1639 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1641 struct net *net = sock_net(sk);
1642 struct sctp_sock *sp;
1643 struct sctp_endpoint *ep;
1644 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1645 struct sctp_transport *transport, *chunk_tp;
1646 struct sctp_chunk *chunk;
1648 struct sockaddr *msg_name = NULL;
1649 struct sctp_sndrcvinfo default_sinfo;
1650 struct sctp_sndrcvinfo *sinfo;
1651 struct sctp_initmsg *sinit;
1652 sctp_assoc_t associd = 0;
1653 sctp_cmsgs_t cmsgs = { NULL };
1655 bool fill_sinfo_ttl = false, wait_connect = false;
1656 struct sctp_datamsg *datamsg;
1657 int msg_flags = msg->msg_flags;
1658 __u16 sinfo_flags = 0;
1666 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1669 /* We cannot send a message over a TCP-style listening socket. */
1670 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1675 /* Parse out the SCTP CMSGs. */
1676 err = sctp_msghdr_parse(msg, &cmsgs);
1678 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1682 /* Fetch the destination address for this packet. This
1683 * address only selects the association--it is not necessarily
1684 * the address we will send to.
1685 * For a peeled-off socket, msg_name is ignored.
1687 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1688 int msg_namelen = msg->msg_namelen;
1690 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1695 if (msg_namelen > sizeof(to))
1696 msg_namelen = sizeof(to);
1697 memcpy(&to, msg->msg_name, msg_namelen);
1698 msg_name = msg->msg_name;
1702 if (cmsgs.sinfo != NULL) {
1703 memset(&default_sinfo, 0, sizeof(default_sinfo));
1704 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1705 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1706 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1707 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1708 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1710 sinfo = &default_sinfo;
1711 fill_sinfo_ttl = true;
1713 sinfo = cmsgs.srinfo;
1715 /* Did the user specify SNDINFO/SNDRCVINFO? */
1717 sinfo_flags = sinfo->sinfo_flags;
1718 associd = sinfo->sinfo_assoc_id;
1721 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1722 msg_len, sinfo_flags);
1724 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1725 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1730 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1731 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1732 * If SCTP_ABORT is set, the message length could be non zero with
1733 * the msg_iov set to the user abort reason.
1735 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1736 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1741 /* If SCTP_ADDR_OVER is set, there must be an address
1742 * specified in msg_name.
1744 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1751 pr_debug("%s: about to look up association\n", __func__);
1755 /* If a msg_name has been specified, assume this is to be used. */
1757 /* Look for a matching association on the endpoint. */
1758 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1760 /* If we could not find a matching association on the
1761 * endpoint, make sure that it is not a TCP-style
1762 * socket that already has an association or there is
1763 * no peeled-off association on another socket.
1765 if ((sctp_style(sk, TCP) &&
1766 sctp_sstate(sk, ESTABLISHED)) ||
1767 sctp_endpoint_is_peeled_off(ep, &to)) {
1768 err = -EADDRNOTAVAIL;
1773 asoc = sctp_id2assoc(sk, associd);
1781 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1783 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1784 * socket that has an association in CLOSED state. This can
1785 * happen when an accepted socket has an association that is
1788 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1793 if (sinfo_flags & SCTP_EOF) {
1794 pr_debug("%s: shutting down association:%p\n",
1797 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1801 if (sinfo_flags & SCTP_ABORT) {
1803 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1809 pr_debug("%s: aborting association:%p\n",
1812 sctp_primitive_ABORT(net, asoc, chunk);
1818 /* Do we need to create the association? */
1820 pr_debug("%s: there is no association yet\n", __func__);
1822 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1827 /* Check for invalid stream against the stream counts,
1828 * either the default or the user specified stream counts.
1831 if (!sinit || !sinit->sinit_num_ostreams) {
1832 /* Check against the defaults. */
1833 if (sinfo->sinfo_stream >=
1834 sp->initmsg.sinit_num_ostreams) {
1839 /* Check against the requested. */
1840 if (sinfo->sinfo_stream >=
1841 sinit->sinit_num_ostreams) {
1849 * API 3.1.2 bind() - UDP Style Syntax
1850 * If a bind() or sctp_bindx() is not called prior to a
1851 * sendmsg() call that initiates a new association, the
1852 * system picks an ephemeral port and will choose an address
1853 * set equivalent to binding with a wildcard address.
1855 if (!ep->base.bind_addr.port) {
1856 if (sctp_autobind(sk)) {
1862 * If an unprivileged user inherits a one-to-many
1863 * style socket with open associations on a privileged
1864 * port, it MAY be permitted to accept new associations,
1865 * but it SHOULD NOT be permitted to open new
1868 if (ep->base.bind_addr.port < PROT_SOCK &&
1869 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1875 scope = sctp_scope(&to);
1876 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1882 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1888 /* If the SCTP_INIT ancillary data is specified, set all
1889 * the association init values accordingly.
1892 if (sinit->sinit_num_ostreams) {
1893 asoc->c.sinit_num_ostreams =
1894 sinit->sinit_num_ostreams;
1896 if (sinit->sinit_max_instreams) {
1897 asoc->c.sinit_max_instreams =
1898 sinit->sinit_max_instreams;
1900 if (sinit->sinit_max_attempts) {
1901 asoc->max_init_attempts
1902 = sinit->sinit_max_attempts;
1904 if (sinit->sinit_max_init_timeo) {
1905 asoc->max_init_timeo =
1906 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1910 /* Prime the peer's transport structures. */
1911 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1918 /* ASSERT: we have a valid association at this point. */
1919 pr_debug("%s: we have a valid association\n", __func__);
1922 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1923 * one with some defaults.
1925 memset(&default_sinfo, 0, sizeof(default_sinfo));
1926 default_sinfo.sinfo_stream = asoc->default_stream;
1927 default_sinfo.sinfo_flags = asoc->default_flags;
1928 default_sinfo.sinfo_ppid = asoc->default_ppid;
1929 default_sinfo.sinfo_context = asoc->default_context;
1930 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1931 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1933 sinfo = &default_sinfo;
1934 } else if (fill_sinfo_ttl) {
1935 /* In case SNDINFO was specified, we still need to fill
1936 * it with a default ttl from the assoc here.
1938 sinfo->sinfo_timetolive = asoc->default_timetolive;
1941 /* API 7.1.7, the sndbuf size per association bounds the
1942 * maximum size of data that can be sent in a single send call.
1944 if (msg_len > sk->sk_sndbuf) {
1949 if (asoc->pmtu_pending)
1950 sctp_assoc_pending_pmtu(sk, asoc);
1952 /* If fragmentation is disabled and the message length exceeds the
1953 * association fragmentation point, return EMSGSIZE. The I-D
1954 * does not specify what this error is, but this looks like
1957 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1962 /* Check for invalid stream. */
1963 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1968 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1969 if (!sctp_wspace(asoc)) {
1970 /* sk can be changed by peel off when waiting for buf. */
1971 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1973 if (err == -ESRCH) {
1974 /* asoc is already dead. */
1982 /* If an address is passed with the sendto/sendmsg call, it is used
1983 * to override the primary destination address in the TCP model, or
1984 * when SCTP_ADDR_OVER flag is set in the UDP model.
1986 if ((sctp_style(sk, TCP) && msg_name) ||
1987 (sinfo_flags & SCTP_ADDR_OVER)) {
1988 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1996 /* Auto-connect, if we aren't connected already. */
1997 if (sctp_state(asoc, CLOSED)) {
1998 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
2002 wait_connect = true;
2003 pr_debug("%s: we associated primitively\n", __func__);
2006 /* Break the message into multiple chunks of maximum size. */
2007 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
2008 if (IS_ERR(datamsg)) {
2009 err = PTR_ERR(datamsg);
2013 /* Now send the (possibly) fragmented message. */
2014 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2015 /* Do accounting for the write space. */
2016 sctp_set_owner_w(chunk);
2018 chunk->transport = chunk_tp;
2021 /* Send it to the lower layers. Note: all chunks
2022 * must either fail or succeed. The lower layer
2023 * works that way today. Keep it that way or this
2026 err = sctp_primitive_SEND(net, asoc, datamsg);
2027 sctp_datamsg_put(datamsg);
2028 /* Did the lower layer accept the chunk? */
2032 pr_debug("%s: we sent primitively\n", __func__);
2036 if (unlikely(wait_connect)) {
2037 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
2038 sctp_wait_for_connect(asoc, &timeo);
2041 /* If we are already past ASSOCIATE, the lower
2042 * layers are responsible for association cleanup.
2048 sctp_unhash_established(asoc);
2049 sctp_association_free(asoc);
2055 return sctp_error(sk, msg_flags, err);
2062 err = sock_error(sk);
2072 /* This is an extended version of skb_pull() that removes the data from the
2073 * start of a skb even when data is spread across the list of skb's in the
2074 * frag_list. len specifies the total amount of data that needs to be removed.
2075 * when 'len' bytes could be removed from the skb, it returns 0.
2076 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2077 * could not be removed.
2079 static int sctp_skb_pull(struct sk_buff *skb, int len)
2081 struct sk_buff *list;
2082 int skb_len = skb_headlen(skb);
2085 if (len <= skb_len) {
2086 __skb_pull(skb, len);
2090 __skb_pull(skb, skb_len);
2092 skb_walk_frags(skb, list) {
2093 rlen = sctp_skb_pull(list, len);
2094 skb->len -= (len-rlen);
2095 skb->data_len -= (len-rlen);
2106 /* API 3.1.3 recvmsg() - UDP Style Syntax
2108 * ssize_t recvmsg(int socket, struct msghdr *message,
2111 * socket - the socket descriptor of the endpoint.
2112 * message - pointer to the msghdr structure which contains a single
2113 * user message and possibly some ancillary data.
2115 * See Section 5 for complete description of the data
2118 * flags - flags sent or received with the user message, see Section
2119 * 5 for complete description of the flags.
2121 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2122 int noblock, int flags, int *addr_len)
2124 struct sctp_ulpevent *event = NULL;
2125 struct sctp_sock *sp = sctp_sk(sk);
2126 struct sk_buff *skb;
2131 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2132 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2137 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2142 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2146 /* Get the total length of the skb including any skb's in the
2155 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2157 event = sctp_skb2event(skb);
2162 sock_recv_ts_and_drops(msg, sk, skb);
2163 if (sctp_ulpevent_is_notification(event)) {
2164 msg->msg_flags |= MSG_NOTIFICATION;
2165 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2167 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2170 /* Check if we allow SCTP_NXTINFO. */
2171 if (sp->recvnxtinfo)
2172 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2173 /* Check if we allow SCTP_RCVINFO. */
2174 if (sp->recvrcvinfo)
2175 sctp_ulpevent_read_rcvinfo(event, msg);
2176 /* Check if we allow SCTP_SNDRCVINFO. */
2177 if (sp->subscribe.sctp_data_io_event)
2178 sctp_ulpevent_read_sndrcvinfo(event, msg);
2182 /* If skb's length exceeds the user's buffer, update the skb and
2183 * push it back to the receive_queue so that the next call to
2184 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2186 if (skb_len > copied) {
2187 msg->msg_flags &= ~MSG_EOR;
2188 if (flags & MSG_PEEK)
2190 sctp_skb_pull(skb, copied);
2191 skb_queue_head(&sk->sk_receive_queue, skb);
2193 /* When only partial message is copied to the user, increase
2194 * rwnd by that amount. If all the data in the skb is read,
2195 * rwnd is updated when the event is freed.
2197 if (!sctp_ulpevent_is_notification(event))
2198 sctp_assoc_rwnd_increase(event->asoc, copied);
2200 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2201 (event->msg_flags & MSG_EOR))
2202 msg->msg_flags |= MSG_EOR;
2204 msg->msg_flags &= ~MSG_EOR;
2207 if (flags & MSG_PEEK) {
2208 /* Release the skb reference acquired after peeking the skb in
2209 * sctp_skb_recv_datagram().
2213 /* Free the event which includes releasing the reference to
2214 * the owner of the skb, freeing the skb and updating the
2217 sctp_ulpevent_free(event);
2224 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2226 * This option is a on/off flag. If enabled no SCTP message
2227 * fragmentation will be performed. Instead if a message being sent
2228 * exceeds the current PMTU size, the message will NOT be sent and
2229 * instead a error will be indicated to the user.
2231 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2232 char __user *optval,
2233 unsigned int optlen)
2237 if (optlen < sizeof(int))
2240 if (get_user(val, (int __user *)optval))
2243 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2248 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2249 unsigned int optlen)
2251 struct sctp_association *asoc;
2252 struct sctp_ulpevent *event;
2254 if (optlen > sizeof(struct sctp_event_subscribe))
2256 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2259 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2260 * if there is no data to be sent or retransmit, the stack will
2261 * immediately send up this notification.
2263 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2264 &sctp_sk(sk)->subscribe)) {
2265 asoc = sctp_id2assoc(sk, 0);
2267 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2268 event = sctp_ulpevent_make_sender_dry_event(asoc,
2273 sctp_ulpq_tail_event(&asoc->ulpq, event);
2280 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2282 * This socket option is applicable to the UDP-style socket only. When
2283 * set it will cause associations that are idle for more than the
2284 * specified number of seconds to automatically close. An association
2285 * being idle is defined an association that has NOT sent or received
2286 * user data. The special value of '0' indicates that no automatic
2287 * close of any associations should be performed. The option expects an
2288 * integer defining the number of seconds of idle time before an
2289 * association is closed.
2291 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2292 unsigned int optlen)
2294 struct sctp_sock *sp = sctp_sk(sk);
2295 struct net *net = sock_net(sk);
2297 /* Applicable to UDP-style socket only */
2298 if (sctp_style(sk, TCP))
2300 if (optlen != sizeof(int))
2302 if (copy_from_user(&sp->autoclose, optval, optlen))
2305 if (sp->autoclose > net->sctp.max_autoclose)
2306 sp->autoclose = net->sctp.max_autoclose;
2311 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2313 * Applications can enable or disable heartbeats for any peer address of
2314 * an association, modify an address's heartbeat interval, force a
2315 * heartbeat to be sent immediately, and adjust the address's maximum
2316 * number of retransmissions sent before an address is considered
2317 * unreachable. The following structure is used to access and modify an
2318 * address's parameters:
2320 * struct sctp_paddrparams {
2321 * sctp_assoc_t spp_assoc_id;
2322 * struct sockaddr_storage spp_address;
2323 * uint32_t spp_hbinterval;
2324 * uint16_t spp_pathmaxrxt;
2325 * uint32_t spp_pathmtu;
2326 * uint32_t spp_sackdelay;
2327 * uint32_t spp_flags;
2330 * spp_assoc_id - (one-to-many style socket) This is filled in the
2331 * application, and identifies the association for
2333 * spp_address - This specifies which address is of interest.
2334 * spp_hbinterval - This contains the value of the heartbeat interval,
2335 * in milliseconds. If a value of zero
2336 * is present in this field then no changes are to
2337 * be made to this parameter.
2338 * spp_pathmaxrxt - This contains the maximum number of
2339 * retransmissions before this address shall be
2340 * considered unreachable. If a value of zero
2341 * is present in this field then no changes are to
2342 * be made to this parameter.
2343 * spp_pathmtu - When Path MTU discovery is disabled the value
2344 * specified here will be the "fixed" path mtu.
2345 * Note that if the spp_address field is empty
2346 * then all associations on this address will
2347 * have this fixed path mtu set upon them.
2349 * spp_sackdelay - When delayed sack is enabled, this value specifies
2350 * the number of milliseconds that sacks will be delayed
2351 * for. This value will apply to all addresses of an
2352 * association if the spp_address field is empty. Note
2353 * also, that if delayed sack is enabled and this
2354 * value is set to 0, no change is made to the last
2355 * recorded delayed sack timer value.
2357 * spp_flags - These flags are used to control various features
2358 * on an association. The flag field may contain
2359 * zero or more of the following options.
2361 * SPP_HB_ENABLE - Enable heartbeats on the
2362 * specified address. Note that if the address
2363 * field is empty all addresses for the association
2364 * have heartbeats enabled upon them.
2366 * SPP_HB_DISABLE - Disable heartbeats on the
2367 * speicifed address. Note that if the address
2368 * field is empty all addresses for the association
2369 * will have their heartbeats disabled. Note also
2370 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2371 * mutually exclusive, only one of these two should
2372 * be specified. Enabling both fields will have
2373 * undetermined results.
2375 * SPP_HB_DEMAND - Request a user initiated heartbeat
2376 * to be made immediately.
2378 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2379 * heartbeat delayis to be set to the value of 0
2382 * SPP_PMTUD_ENABLE - This field will enable PMTU
2383 * discovery upon the specified address. Note that
2384 * if the address feild is empty then all addresses
2385 * on the association are effected.
2387 * SPP_PMTUD_DISABLE - This field will disable PMTU
2388 * discovery upon the specified address. Note that
2389 * if the address feild is empty then all addresses
2390 * on the association are effected. Not also that
2391 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2392 * exclusive. Enabling both will have undetermined
2395 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2396 * on delayed sack. The time specified in spp_sackdelay
2397 * is used to specify the sack delay for this address. Note
2398 * that if spp_address is empty then all addresses will
2399 * enable delayed sack and take on the sack delay
2400 * value specified in spp_sackdelay.
2401 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2402 * off delayed sack. If the spp_address field is blank then
2403 * delayed sack is disabled for the entire association. Note
2404 * also that this field is mutually exclusive to
2405 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2408 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2409 struct sctp_transport *trans,
2410 struct sctp_association *asoc,
2411 struct sctp_sock *sp,
2414 int sackdelay_change)
2418 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2419 struct net *net = sock_net(trans->asoc->base.sk);
2421 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2426 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2427 * this field is ignored. Note also that a value of zero indicates
2428 * the current setting should be left unchanged.
2430 if (params->spp_flags & SPP_HB_ENABLE) {
2432 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2433 * set. This lets us use 0 value when this flag
2436 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2437 params->spp_hbinterval = 0;
2439 if (params->spp_hbinterval ||
2440 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2443 msecs_to_jiffies(params->spp_hbinterval);
2446 msecs_to_jiffies(params->spp_hbinterval);
2448 sp->hbinterval = params->spp_hbinterval;
2455 trans->param_flags =
2456 (trans->param_flags & ~SPP_HB) | hb_change;
2459 (asoc->param_flags & ~SPP_HB) | hb_change;
2462 (sp->param_flags & ~SPP_HB) | hb_change;
2466 /* When Path MTU discovery is disabled the value specified here will
2467 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2468 * include the flag SPP_PMTUD_DISABLE for this field to have any
2471 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2473 trans->pathmtu = params->spp_pathmtu;
2474 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2476 asoc->pathmtu = params->spp_pathmtu;
2477 sctp_frag_point(asoc, params->spp_pathmtu);
2479 sp->pathmtu = params->spp_pathmtu;
2485 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2486 (params->spp_flags & SPP_PMTUD_ENABLE);
2487 trans->param_flags =
2488 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2490 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2491 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2495 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2498 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2502 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2503 * value of this field is ignored. Note also that a value of zero
2504 * indicates the current setting should be left unchanged.
2506 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2509 msecs_to_jiffies(params->spp_sackdelay);
2512 msecs_to_jiffies(params->spp_sackdelay);
2514 sp->sackdelay = params->spp_sackdelay;
2518 if (sackdelay_change) {
2520 trans->param_flags =
2521 (trans->param_flags & ~SPP_SACKDELAY) |
2525 (asoc->param_flags & ~SPP_SACKDELAY) |
2529 (sp->param_flags & ~SPP_SACKDELAY) |
2534 /* Note that a value of zero indicates the current setting should be
2537 if (params->spp_pathmaxrxt) {
2539 trans->pathmaxrxt = params->spp_pathmaxrxt;
2541 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2543 sp->pathmaxrxt = params->spp_pathmaxrxt;
2550 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2551 char __user *optval,
2552 unsigned int optlen)
2554 struct sctp_paddrparams params;
2555 struct sctp_transport *trans = NULL;
2556 struct sctp_association *asoc = NULL;
2557 struct sctp_sock *sp = sctp_sk(sk);
2559 int hb_change, pmtud_change, sackdelay_change;
2561 if (optlen != sizeof(struct sctp_paddrparams))
2564 if (copy_from_user(¶ms, optval, optlen))
2567 /* Validate flags and value parameters. */
2568 hb_change = params.spp_flags & SPP_HB;
2569 pmtud_change = params.spp_flags & SPP_PMTUD;
2570 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2572 if (hb_change == SPP_HB ||
2573 pmtud_change == SPP_PMTUD ||
2574 sackdelay_change == SPP_SACKDELAY ||
2575 params.spp_sackdelay > 500 ||
2576 (params.spp_pathmtu &&
2577 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2580 /* If an address other than INADDR_ANY is specified, and
2581 * no transport is found, then the request is invalid.
2583 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2584 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2585 params.spp_assoc_id);
2590 /* Get association, if assoc_id != 0 and the socket is a one
2591 * to many style socket, and an association was not found, then
2592 * the id was invalid.
2594 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2595 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2598 /* Heartbeat demand can only be sent on a transport or
2599 * association, but not a socket.
2601 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2604 /* Process parameters. */
2605 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2606 hb_change, pmtud_change,
2612 /* If changes are for association, also apply parameters to each
2615 if (!trans && asoc) {
2616 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2618 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2619 hb_change, pmtud_change,
2627 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2629 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2632 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2634 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2638 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2640 * This option will effect the way delayed acks are performed. This
2641 * option allows you to get or set the delayed ack time, in
2642 * milliseconds. It also allows changing the delayed ack frequency.
2643 * Changing the frequency to 1 disables the delayed sack algorithm. If
2644 * the assoc_id is 0, then this sets or gets the endpoints default
2645 * values. If the assoc_id field is non-zero, then the set or get
2646 * effects the specified association for the one to many model (the
2647 * assoc_id field is ignored by the one to one model). Note that if
2648 * sack_delay or sack_freq are 0 when setting this option, then the
2649 * current values will remain unchanged.
2651 * struct sctp_sack_info {
2652 * sctp_assoc_t sack_assoc_id;
2653 * uint32_t sack_delay;
2654 * uint32_t sack_freq;
2657 * sack_assoc_id - This parameter, indicates which association the user
2658 * is performing an action upon. Note that if this field's value is
2659 * zero then the endpoints default value is changed (effecting future
2660 * associations only).
2662 * sack_delay - This parameter contains the number of milliseconds that
2663 * the user is requesting the delayed ACK timer be set to. Note that
2664 * this value is defined in the standard to be between 200 and 500
2667 * sack_freq - This parameter contains the number of packets that must
2668 * be received before a sack is sent without waiting for the delay
2669 * timer to expire. The default value for this is 2, setting this
2670 * value to 1 will disable the delayed sack algorithm.
2673 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2674 char __user *optval, unsigned int optlen)
2676 struct sctp_sack_info params;
2677 struct sctp_transport *trans = NULL;
2678 struct sctp_association *asoc = NULL;
2679 struct sctp_sock *sp = sctp_sk(sk);
2681 if (optlen == sizeof(struct sctp_sack_info)) {
2682 if (copy_from_user(¶ms, optval, optlen))
2685 if (params.sack_delay == 0 && params.sack_freq == 0)
2687 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2688 pr_warn_ratelimited(DEPRECATED
2690 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2691 "Use struct sctp_sack_info instead\n",
2692 current->comm, task_pid_nr(current));
2693 if (copy_from_user(¶ms, optval, optlen))
2696 if (params.sack_delay == 0)
2697 params.sack_freq = 1;
2699 params.sack_freq = 0;
2703 /* Validate value parameter. */
2704 if (params.sack_delay > 500)
2707 /* Get association, if sack_assoc_id != 0 and the socket is a one
2708 * to many style socket, and an association was not found, then
2709 * the id was invalid.
2711 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2712 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2715 if (params.sack_delay) {
2718 msecs_to_jiffies(params.sack_delay);
2720 sctp_spp_sackdelay_enable(asoc->param_flags);
2722 sp->sackdelay = params.sack_delay;
2724 sctp_spp_sackdelay_enable(sp->param_flags);
2728 if (params.sack_freq == 1) {
2731 sctp_spp_sackdelay_disable(asoc->param_flags);
2734 sctp_spp_sackdelay_disable(sp->param_flags);
2736 } else if (params.sack_freq > 1) {
2738 asoc->sackfreq = params.sack_freq;
2740 sctp_spp_sackdelay_enable(asoc->param_flags);
2742 sp->sackfreq = params.sack_freq;
2744 sctp_spp_sackdelay_enable(sp->param_flags);
2748 /* If change is for association, also apply to each transport. */
2750 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2752 if (params.sack_delay) {
2754 msecs_to_jiffies(params.sack_delay);
2755 trans->param_flags =
2756 sctp_spp_sackdelay_enable(trans->param_flags);
2758 if (params.sack_freq == 1) {
2759 trans->param_flags =
2760 sctp_spp_sackdelay_disable(trans->param_flags);
2761 } else if (params.sack_freq > 1) {
2762 trans->sackfreq = params.sack_freq;
2763 trans->param_flags =
2764 sctp_spp_sackdelay_enable(trans->param_flags);
2772 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2774 * Applications can specify protocol parameters for the default association
2775 * initialization. The option name argument to setsockopt() and getsockopt()
2778 * Setting initialization parameters is effective only on an unconnected
2779 * socket (for UDP-style sockets only future associations are effected
2780 * by the change). With TCP-style sockets, this option is inherited by
2781 * sockets derived from a listener socket.
2783 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2785 struct sctp_initmsg sinit;
2786 struct sctp_sock *sp = sctp_sk(sk);
2788 if (optlen != sizeof(struct sctp_initmsg))
2790 if (copy_from_user(&sinit, optval, optlen))
2793 if (sinit.sinit_num_ostreams)
2794 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2795 if (sinit.sinit_max_instreams)
2796 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2797 if (sinit.sinit_max_attempts)
2798 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2799 if (sinit.sinit_max_init_timeo)
2800 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2806 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2808 * Applications that wish to use the sendto() system call may wish to
2809 * specify a default set of parameters that would normally be supplied
2810 * through the inclusion of ancillary data. This socket option allows
2811 * such an application to set the default sctp_sndrcvinfo structure.
2812 * The application that wishes to use this socket option simply passes
2813 * in to this call the sctp_sndrcvinfo structure defined in Section
2814 * 5.2.2) The input parameters accepted by this call include
2815 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2816 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2817 * to this call if the caller is using the UDP model.
2819 static int sctp_setsockopt_default_send_param(struct sock *sk,
2820 char __user *optval,
2821 unsigned int optlen)
2823 struct sctp_sock *sp = sctp_sk(sk);
2824 struct sctp_association *asoc;
2825 struct sctp_sndrcvinfo info;
2827 if (optlen != sizeof(info))
2829 if (copy_from_user(&info, optval, optlen))
2831 if (info.sinfo_flags &
2832 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2833 SCTP_ABORT | SCTP_EOF))
2836 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2837 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2840 asoc->default_stream = info.sinfo_stream;
2841 asoc->default_flags = info.sinfo_flags;
2842 asoc->default_ppid = info.sinfo_ppid;
2843 asoc->default_context = info.sinfo_context;
2844 asoc->default_timetolive = info.sinfo_timetolive;
2846 sp->default_stream = info.sinfo_stream;
2847 sp->default_flags = info.sinfo_flags;
2848 sp->default_ppid = info.sinfo_ppid;
2849 sp->default_context = info.sinfo_context;
2850 sp->default_timetolive = info.sinfo_timetolive;
2856 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2857 * (SCTP_DEFAULT_SNDINFO)
2859 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2860 char __user *optval,
2861 unsigned int optlen)
2863 struct sctp_sock *sp = sctp_sk(sk);
2864 struct sctp_association *asoc;
2865 struct sctp_sndinfo info;
2867 if (optlen != sizeof(info))
2869 if (copy_from_user(&info, optval, optlen))
2871 if (info.snd_flags &
2872 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2873 SCTP_ABORT | SCTP_EOF))
2876 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2877 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2880 asoc->default_stream = info.snd_sid;
2881 asoc->default_flags = info.snd_flags;
2882 asoc->default_ppid = info.snd_ppid;
2883 asoc->default_context = info.snd_context;
2885 sp->default_stream = info.snd_sid;
2886 sp->default_flags = info.snd_flags;
2887 sp->default_ppid = info.snd_ppid;
2888 sp->default_context = info.snd_context;
2894 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2896 * Requests that the local SCTP stack use the enclosed peer address as
2897 * the association primary. The enclosed address must be one of the
2898 * association peer's addresses.
2900 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2901 unsigned int optlen)
2903 struct sctp_prim prim;
2904 struct sctp_transport *trans;
2906 if (optlen != sizeof(struct sctp_prim))
2909 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2912 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2916 sctp_assoc_set_primary(trans->asoc, trans);
2922 * 7.1.5 SCTP_NODELAY
2924 * Turn on/off any Nagle-like algorithm. This means that packets are
2925 * generally sent as soon as possible and no unnecessary delays are
2926 * introduced, at the cost of more packets in the network. Expects an
2927 * integer boolean flag.
2929 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2930 unsigned int optlen)
2934 if (optlen < sizeof(int))
2936 if (get_user(val, (int __user *)optval))
2939 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2945 * 7.1.1 SCTP_RTOINFO
2947 * The protocol parameters used to initialize and bound retransmission
2948 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2949 * and modify these parameters.
2950 * All parameters are time values, in milliseconds. A value of 0, when
2951 * modifying the parameters, indicates that the current value should not
2955 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2957 struct sctp_rtoinfo rtoinfo;
2958 struct sctp_association *asoc;
2959 unsigned long rto_min, rto_max;
2960 struct sctp_sock *sp = sctp_sk(sk);
2962 if (optlen != sizeof (struct sctp_rtoinfo))
2965 if (copy_from_user(&rtoinfo, optval, optlen))
2968 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2970 /* Set the values to the specific association */
2971 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2974 rto_max = rtoinfo.srto_max;
2975 rto_min = rtoinfo.srto_min;
2978 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2980 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2983 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2985 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2987 if (rto_min > rto_max)
2991 if (rtoinfo.srto_initial != 0)
2993 msecs_to_jiffies(rtoinfo.srto_initial);
2994 asoc->rto_max = rto_max;
2995 asoc->rto_min = rto_min;
2997 /* If there is no association or the association-id = 0
2998 * set the values to the endpoint.
3000 if (rtoinfo.srto_initial != 0)
3001 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3002 sp->rtoinfo.srto_max = rto_max;
3003 sp->rtoinfo.srto_min = rto_min;
3011 * 7.1.2 SCTP_ASSOCINFO
3013 * This option is used to tune the maximum retransmission attempts
3014 * of the association.
3015 * Returns an error if the new association retransmission value is
3016 * greater than the sum of the retransmission value of the peer.
3017 * See [SCTP] for more information.
3020 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3023 struct sctp_assocparams assocparams;
3024 struct sctp_association *asoc;
3026 if (optlen != sizeof(struct sctp_assocparams))
3028 if (copy_from_user(&assocparams, optval, optlen))
3031 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3033 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3036 /* Set the values to the specific association */
3038 if (assocparams.sasoc_asocmaxrxt != 0) {
3041 struct sctp_transport *peer_addr;
3043 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3045 path_sum += peer_addr->pathmaxrxt;
3049 /* Only validate asocmaxrxt if we have more than
3050 * one path/transport. We do this because path
3051 * retransmissions are only counted when we have more
3055 assocparams.sasoc_asocmaxrxt > path_sum)
3058 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3061 if (assocparams.sasoc_cookie_life != 0)
3062 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3064 /* Set the values to the endpoint */
3065 struct sctp_sock *sp = sctp_sk(sk);
3067 if (assocparams.sasoc_asocmaxrxt != 0)
3068 sp->assocparams.sasoc_asocmaxrxt =
3069 assocparams.sasoc_asocmaxrxt;
3070 if (assocparams.sasoc_cookie_life != 0)
3071 sp->assocparams.sasoc_cookie_life =
3072 assocparams.sasoc_cookie_life;
3078 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3080 * This socket option is a boolean flag which turns on or off mapped V4
3081 * addresses. If this option is turned on and the socket is type
3082 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3083 * If this option is turned off, then no mapping will be done of V4
3084 * addresses and a user will receive both PF_INET6 and PF_INET type
3085 * addresses on the socket.
3087 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3090 struct sctp_sock *sp = sctp_sk(sk);
3092 if (optlen < sizeof(int))
3094 if (get_user(val, (int __user *)optval))
3105 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3106 * This option will get or set the maximum size to put in any outgoing
3107 * SCTP DATA chunk. If a message is larger than this size it will be
3108 * fragmented by SCTP into the specified size. Note that the underlying
3109 * SCTP implementation may fragment into smaller sized chunks when the
3110 * PMTU of the underlying association is smaller than the value set by
3111 * the user. The default value for this option is '0' which indicates
3112 * the user is NOT limiting fragmentation and only the PMTU will effect
3113 * SCTP's choice of DATA chunk size. Note also that values set larger
3114 * than the maximum size of an IP datagram will effectively let SCTP
3115 * control fragmentation (i.e. the same as setting this option to 0).
3117 * The following structure is used to access and modify this parameter:
3119 * struct sctp_assoc_value {
3120 * sctp_assoc_t assoc_id;
3121 * uint32_t assoc_value;
3124 * assoc_id: This parameter is ignored for one-to-one style sockets.
3125 * For one-to-many style sockets this parameter indicates which
3126 * association the user is performing an action upon. Note that if
3127 * this field's value is zero then the endpoints default value is
3128 * changed (effecting future associations only).
3129 * assoc_value: This parameter specifies the maximum size in bytes.
3131 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3133 struct sctp_assoc_value params;
3134 struct sctp_association *asoc;
3135 struct sctp_sock *sp = sctp_sk(sk);
3138 if (optlen == sizeof(int)) {
3139 pr_warn_ratelimited(DEPRECATED
3141 "Use of int in maxseg socket option.\n"
3142 "Use struct sctp_assoc_value instead\n",
3143 current->comm, task_pid_nr(current));
3144 if (copy_from_user(&val, optval, optlen))
3146 params.assoc_id = 0;
3147 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3148 if (copy_from_user(¶ms, optval, optlen))
3150 val = params.assoc_value;
3154 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3157 asoc = sctp_id2assoc(sk, params.assoc_id);
3158 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3163 val = asoc->pathmtu;
3164 val -= sp->pf->af->net_header_len;
3165 val -= sizeof(struct sctphdr) +
3166 sizeof(struct sctp_data_chunk);
3168 asoc->user_frag = val;
3169 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3171 sp->user_frag = val;
3179 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3181 * Requests that the peer mark the enclosed address as the association
3182 * primary. The enclosed address must be one of the association's
3183 * locally bound addresses. The following structure is used to make a
3184 * set primary request:
3186 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3187 unsigned int optlen)
3189 struct net *net = sock_net(sk);
3190 struct sctp_sock *sp;
3191 struct sctp_association *asoc = NULL;
3192 struct sctp_setpeerprim prim;
3193 struct sctp_chunk *chunk;
3199 if (!net->sctp.addip_enable)
3202 if (optlen != sizeof(struct sctp_setpeerprim))
3205 if (copy_from_user(&prim, optval, optlen))
3208 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3212 if (!asoc->peer.asconf_capable)
3215 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3218 if (!sctp_state(asoc, ESTABLISHED))
3221 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3225 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3226 return -EADDRNOTAVAIL;
3228 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3229 return -EADDRNOTAVAIL;
3231 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3232 chunk = sctp_make_asconf_set_prim(asoc,
3233 (union sctp_addr *)&prim.sspp_addr);
3237 err = sctp_send_asconf(asoc, chunk);
3239 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3244 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3245 unsigned int optlen)
3247 struct sctp_setadaptation adaptation;
3249 if (optlen != sizeof(struct sctp_setadaptation))
3251 if (copy_from_user(&adaptation, optval, optlen))
3254 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3260 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3262 * The context field in the sctp_sndrcvinfo structure is normally only
3263 * used when a failed message is retrieved holding the value that was
3264 * sent down on the actual send call. This option allows the setting of
3265 * a default context on an association basis that will be received on
3266 * reading messages from the peer. This is especially helpful in the
3267 * one-2-many model for an application to keep some reference to an
3268 * internal state machine that is processing messages on the
3269 * association. Note that the setting of this value only effects
3270 * received messages from the peer and does not effect the value that is
3271 * saved with outbound messages.
3273 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3274 unsigned int optlen)
3276 struct sctp_assoc_value params;
3277 struct sctp_sock *sp;
3278 struct sctp_association *asoc;
3280 if (optlen != sizeof(struct sctp_assoc_value))
3282 if (copy_from_user(¶ms, optval, optlen))
3287 if (params.assoc_id != 0) {
3288 asoc = sctp_id2assoc(sk, params.assoc_id);
3291 asoc->default_rcv_context = params.assoc_value;
3293 sp->default_rcv_context = params.assoc_value;
3300 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3302 * This options will at a minimum specify if the implementation is doing
3303 * fragmented interleave. Fragmented interleave, for a one to many
3304 * socket, is when subsequent calls to receive a message may return
3305 * parts of messages from different associations. Some implementations
3306 * may allow you to turn this value on or off. If so, when turned off,
3307 * no fragment interleave will occur (which will cause a head of line
3308 * blocking amongst multiple associations sharing the same one to many
3309 * socket). When this option is turned on, then each receive call may
3310 * come from a different association (thus the user must receive data
3311 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3312 * association each receive belongs to.
3314 * This option takes a boolean value. A non-zero value indicates that
3315 * fragmented interleave is on. A value of zero indicates that
3316 * fragmented interleave is off.
3318 * Note that it is important that an implementation that allows this
3319 * option to be turned on, have it off by default. Otherwise an unaware
3320 * application using the one to many model may become confused and act
3323 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3324 char __user *optval,
3325 unsigned int optlen)
3329 if (optlen != sizeof(int))
3331 if (get_user(val, (int __user *)optval))
3334 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3340 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3341 * (SCTP_PARTIAL_DELIVERY_POINT)
3343 * This option will set or get the SCTP partial delivery point. This
3344 * point is the size of a message where the partial delivery API will be
3345 * invoked to help free up rwnd space for the peer. Setting this to a
3346 * lower value will cause partial deliveries to happen more often. The
3347 * calls argument is an integer that sets or gets the partial delivery
3348 * point. Note also that the call will fail if the user attempts to set
3349 * this value larger than the socket receive buffer size.
3351 * Note that any single message having a length smaller than or equal to
3352 * the SCTP partial delivery point will be delivered in one single read
3353 * call as long as the user provided buffer is large enough to hold the
3356 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3357 char __user *optval,
3358 unsigned int optlen)
3362 if (optlen != sizeof(u32))
3364 if (get_user(val, (int __user *)optval))
3367 /* Note: We double the receive buffer from what the user sets
3368 * it to be, also initial rwnd is based on rcvbuf/2.
3370 if (val > (sk->sk_rcvbuf >> 1))
3373 sctp_sk(sk)->pd_point = val;
3375 return 0; /* is this the right error code? */
3379 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3381 * This option will allow a user to change the maximum burst of packets
3382 * that can be emitted by this association. Note that the default value
3383 * is 4, and some implementations may restrict this setting so that it
3384 * can only be lowered.
3386 * NOTE: This text doesn't seem right. Do this on a socket basis with
3387 * future associations inheriting the socket value.
3389 static int sctp_setsockopt_maxburst(struct sock *sk,
3390 char __user *optval,
3391 unsigned int optlen)
3393 struct sctp_assoc_value params;
3394 struct sctp_sock *sp;
3395 struct sctp_association *asoc;
3399 if (optlen == sizeof(int)) {
3400 pr_warn_ratelimited(DEPRECATED
3402 "Use of int in max_burst socket option deprecated.\n"
3403 "Use struct sctp_assoc_value instead\n",
3404 current->comm, task_pid_nr(current));
3405 if (copy_from_user(&val, optval, optlen))
3407 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3408 if (copy_from_user(¶ms, optval, optlen))
3410 val = params.assoc_value;
3411 assoc_id = params.assoc_id;
3417 if (assoc_id != 0) {
3418 asoc = sctp_id2assoc(sk, assoc_id);
3421 asoc->max_burst = val;
3423 sp->max_burst = val;
3429 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3431 * This set option adds a chunk type that the user is requesting to be
3432 * received only in an authenticated way. Changes to the list of chunks
3433 * will only effect future associations on the socket.
3435 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3436 char __user *optval,
3437 unsigned int optlen)
3439 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3440 struct sctp_authchunk val;
3442 if (!ep->auth_enable)
3445 if (optlen != sizeof(struct sctp_authchunk))
3447 if (copy_from_user(&val, optval, optlen))
3450 switch (val.sauth_chunk) {
3452 case SCTP_CID_INIT_ACK:
3453 case SCTP_CID_SHUTDOWN_COMPLETE:
3458 /* add this chunk id to the endpoint */
3459 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3463 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3465 * This option gets or sets the list of HMAC algorithms that the local
3466 * endpoint requires the peer to use.
3468 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3469 char __user *optval,
3470 unsigned int optlen)
3472 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3473 struct sctp_hmacalgo *hmacs;
3477 if (!ep->auth_enable)
3480 if (optlen < sizeof(struct sctp_hmacalgo))
3483 hmacs = memdup_user(optval, optlen);
3485 return PTR_ERR(hmacs);
3487 idents = hmacs->shmac_num_idents;
3488 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3489 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3494 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3501 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3503 * This option will set a shared secret key which is used to build an
3504 * association shared key.
3506 static int sctp_setsockopt_auth_key(struct sock *sk,
3507 char __user *optval,
3508 unsigned int optlen)
3510 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3511 struct sctp_authkey *authkey;
3512 struct sctp_association *asoc;
3515 if (!ep->auth_enable)
3518 if (optlen <= sizeof(struct sctp_authkey))
3521 authkey = memdup_user(optval, optlen);
3522 if (IS_ERR(authkey))
3523 return PTR_ERR(authkey);
3525 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3530 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3531 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3536 ret = sctp_auth_set_key(ep, asoc, authkey);
3543 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3545 * This option will get or set the active shared key to be used to build
3546 * the association shared key.
3548 static int sctp_setsockopt_active_key(struct sock *sk,
3549 char __user *optval,
3550 unsigned int optlen)
3552 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3553 struct sctp_authkeyid val;
3554 struct sctp_association *asoc;
3556 if (!ep->auth_enable)
3559 if (optlen != sizeof(struct sctp_authkeyid))
3561 if (copy_from_user(&val, optval, optlen))
3564 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3565 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3568 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3572 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3574 * This set option will delete a shared secret key from use.
3576 static int sctp_setsockopt_del_key(struct sock *sk,
3577 char __user *optval,
3578 unsigned int optlen)
3580 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3581 struct sctp_authkeyid val;
3582 struct sctp_association *asoc;
3584 if (!ep->auth_enable)
3587 if (optlen != sizeof(struct sctp_authkeyid))
3589 if (copy_from_user(&val, optval, optlen))
3592 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3593 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3596 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3601 * 8.1.23 SCTP_AUTO_ASCONF
3603 * This option will enable or disable the use of the automatic generation of
3604 * ASCONF chunks to add and delete addresses to an existing association. Note
3605 * that this option has two caveats namely: a) it only affects sockets that
3606 * are bound to all addresses available to the SCTP stack, and b) the system
3607 * administrator may have an overriding control that turns the ASCONF feature
3608 * off no matter what setting the socket option may have.
3609 * This option expects an integer boolean flag, where a non-zero value turns on
3610 * the option, and a zero value turns off the option.
3611 * Note. In this implementation, socket operation overrides default parameter
3612 * being set by sysctl as well as FreeBSD implementation
3614 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3615 unsigned int optlen)
3618 struct sctp_sock *sp = sctp_sk(sk);
3620 if (optlen < sizeof(int))
3622 if (get_user(val, (int __user *)optval))
3624 if (!sctp_is_ep_boundall(sk) && val)
3626 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3629 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3630 if (val == 0 && sp->do_auto_asconf) {
3631 list_del(&sp->auto_asconf_list);
3632 sp->do_auto_asconf = 0;
3633 } else if (val && !sp->do_auto_asconf) {
3634 list_add_tail(&sp->auto_asconf_list,
3635 &sock_net(sk)->sctp.auto_asconf_splist);
3636 sp->do_auto_asconf = 1;
3638 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3643 * SCTP_PEER_ADDR_THLDS
3645 * This option allows us to alter the partially failed threshold for one or all
3646 * transports in an association. See Section 6.1 of:
3647 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3649 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3650 char __user *optval,
3651 unsigned int optlen)
3653 struct sctp_paddrthlds val;
3654 struct sctp_transport *trans;
3655 struct sctp_association *asoc;
3657 if (optlen < sizeof(struct sctp_paddrthlds))
3659 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3660 sizeof(struct sctp_paddrthlds)))
3664 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3665 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3668 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3670 if (val.spt_pathmaxrxt)
3671 trans->pathmaxrxt = val.spt_pathmaxrxt;
3672 trans->pf_retrans = val.spt_pathpfthld;
3675 if (val.spt_pathmaxrxt)
3676 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3677 asoc->pf_retrans = val.spt_pathpfthld;
3679 trans = sctp_addr_id2transport(sk, &val.spt_address,
3684 if (val.spt_pathmaxrxt)
3685 trans->pathmaxrxt = val.spt_pathmaxrxt;
3686 trans->pf_retrans = val.spt_pathpfthld;
3692 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3693 char __user *optval,
3694 unsigned int optlen)
3698 if (optlen < sizeof(int))
3700 if (get_user(val, (int __user *) optval))
3703 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3708 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3709 char __user *optval,
3710 unsigned int optlen)
3714 if (optlen < sizeof(int))
3716 if (get_user(val, (int __user *) optval))
3719 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3724 /* API 6.2 setsockopt(), getsockopt()
3726 * Applications use setsockopt() and getsockopt() to set or retrieve
3727 * socket options. Socket options are used to change the default
3728 * behavior of sockets calls. They are described in Section 7.
3732 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3733 * int __user *optlen);
3734 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3737 * sd - the socket descript.
3738 * level - set to IPPROTO_SCTP for all SCTP options.
3739 * optname - the option name.
3740 * optval - the buffer to store the value of the option.
3741 * optlen - the size of the buffer.
3743 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3744 char __user *optval, unsigned int optlen)
3748 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3750 /* I can hardly begin to describe how wrong this is. This is
3751 * so broken as to be worse than useless. The API draft
3752 * REALLY is NOT helpful here... I am not convinced that the
3753 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3754 * are at all well-founded.
3756 if (level != SOL_SCTP) {
3757 struct sctp_af *af = sctp_sk(sk)->pf->af;
3758 retval = af->setsockopt(sk, level, optname, optval, optlen);
3765 case SCTP_SOCKOPT_BINDX_ADD:
3766 /* 'optlen' is the size of the addresses buffer. */
3767 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3768 optlen, SCTP_BINDX_ADD_ADDR);
3771 case SCTP_SOCKOPT_BINDX_REM:
3772 /* 'optlen' is the size of the addresses buffer. */
3773 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3774 optlen, SCTP_BINDX_REM_ADDR);
3777 case SCTP_SOCKOPT_CONNECTX_OLD:
3778 /* 'optlen' is the size of the addresses buffer. */
3779 retval = sctp_setsockopt_connectx_old(sk,
3780 (struct sockaddr __user *)optval,
3784 case SCTP_SOCKOPT_CONNECTX:
3785 /* 'optlen' is the size of the addresses buffer. */
3786 retval = sctp_setsockopt_connectx(sk,
3787 (struct sockaddr __user *)optval,
3791 case SCTP_DISABLE_FRAGMENTS:
3792 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3796 retval = sctp_setsockopt_events(sk, optval, optlen);
3799 case SCTP_AUTOCLOSE:
3800 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3803 case SCTP_PEER_ADDR_PARAMS:
3804 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3807 case SCTP_DELAYED_SACK:
3808 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3810 case SCTP_PARTIAL_DELIVERY_POINT:
3811 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3815 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3817 case SCTP_DEFAULT_SEND_PARAM:
3818 retval = sctp_setsockopt_default_send_param(sk, optval,
3821 case SCTP_DEFAULT_SNDINFO:
3822 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3824 case SCTP_PRIMARY_ADDR:
3825 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3827 case SCTP_SET_PEER_PRIMARY_ADDR:
3828 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3831 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3834 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3836 case SCTP_ASSOCINFO:
3837 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3839 case SCTP_I_WANT_MAPPED_V4_ADDR:
3840 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3843 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3845 case SCTP_ADAPTATION_LAYER:
3846 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3849 retval = sctp_setsockopt_context(sk, optval, optlen);
3851 case SCTP_FRAGMENT_INTERLEAVE:
3852 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3854 case SCTP_MAX_BURST:
3855 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3857 case SCTP_AUTH_CHUNK:
3858 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3860 case SCTP_HMAC_IDENT:
3861 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3864 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3866 case SCTP_AUTH_ACTIVE_KEY:
3867 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3869 case SCTP_AUTH_DELETE_KEY:
3870 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3872 case SCTP_AUTO_ASCONF:
3873 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3875 case SCTP_PEER_ADDR_THLDS:
3876 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3878 case SCTP_RECVRCVINFO:
3879 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3881 case SCTP_RECVNXTINFO:
3882 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3885 retval = -ENOPROTOOPT;
3895 /* API 3.1.6 connect() - UDP Style Syntax
3897 * An application may use the connect() call in the UDP model to initiate an
3898 * association without sending data.
3902 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3904 * sd: the socket descriptor to have a new association added to.
3906 * nam: the address structure (either struct sockaddr_in or struct
3907 * sockaddr_in6 defined in RFC2553 [7]).
3909 * len: the size of the address.
3911 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3912 int addr_len, int flags)
3918 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3921 /* Validate addr_len before calling common connect/connectx routine. */
3922 af = sctp_get_af_specific(addr->sa_family);
3923 if (af && addr_len >= af->sockaddr_len)
3924 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
3930 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
3931 int addr_len, int flags)
3933 if (addr_len < sizeof(uaddr->sa_family))
3936 if (uaddr->sa_family == AF_UNSPEC)
3939 return sctp_connect(sock->sk, uaddr, addr_len, flags);
3942 /* FIXME: Write comments. */
3943 static int sctp_disconnect(struct sock *sk, int flags)
3945 return -EOPNOTSUPP; /* STUB */
3948 /* 4.1.4 accept() - TCP Style Syntax
3950 * Applications use accept() call to remove an established SCTP
3951 * association from the accept queue of the endpoint. A new socket
3952 * descriptor will be returned from accept() to represent the newly
3953 * formed association.
3955 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3957 struct sctp_sock *sp;
3958 struct sctp_endpoint *ep;
3959 struct sock *newsk = NULL;
3960 struct sctp_association *asoc;
3969 if (!sctp_style(sk, TCP)) {
3970 error = -EOPNOTSUPP;
3974 if (!sctp_sstate(sk, LISTENING)) {
3979 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3981 error = sctp_wait_for_accept(sk, timeo);
3985 /* We treat the list of associations on the endpoint as the accept
3986 * queue and pick the first association on the list.
3988 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3990 newsk = sp->pf->create_accept_sk(sk, asoc);
3996 /* Populate the fields of the newsk from the oldsk and migrate the
3997 * asoc to the newsk.
3999 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4007 /* The SCTP ioctl handler. */
4008 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4015 * SEQPACKET-style sockets in LISTENING state are valid, for
4016 * SCTP, so only discard TCP-style sockets in LISTENING state.
4018 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4023 struct sk_buff *skb;
4024 unsigned int amount = 0;
4026 skb = skb_peek(&sk->sk_receive_queue);
4029 * We will only return the amount of this packet since
4030 * that is all that will be read.
4034 rc = put_user(amount, (int __user *)arg);
4046 /* This is the function which gets called during socket creation to
4047 * initialized the SCTP-specific portion of the sock.
4048 * The sock structure should already be zero-filled memory.
4050 static int sctp_init_sock(struct sock *sk)
4052 struct net *net = sock_net(sk);
4053 struct sctp_sock *sp;
4055 pr_debug("%s: sk:%p\n", __func__, sk);
4059 /* Initialize the SCTP per socket area. */
4060 switch (sk->sk_type) {
4061 case SOCK_SEQPACKET:
4062 sp->type = SCTP_SOCKET_UDP;
4065 sp->type = SCTP_SOCKET_TCP;
4068 return -ESOCKTNOSUPPORT;
4071 /* Initialize default send parameters. These parameters can be
4072 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4074 sp->default_stream = 0;
4075 sp->default_ppid = 0;
4076 sp->default_flags = 0;
4077 sp->default_context = 0;
4078 sp->default_timetolive = 0;
4080 sp->default_rcv_context = 0;
4081 sp->max_burst = net->sctp.max_burst;
4083 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4085 /* Initialize default setup parameters. These parameters
4086 * can be modified with the SCTP_INITMSG socket option or
4087 * overridden by the SCTP_INIT CMSG.
4089 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4090 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4091 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4092 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4094 /* Initialize default RTO related parameters. These parameters can
4095 * be modified for with the SCTP_RTOINFO socket option.
4097 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4098 sp->rtoinfo.srto_max = net->sctp.rto_max;
4099 sp->rtoinfo.srto_min = net->sctp.rto_min;
4101 /* Initialize default association related parameters. These parameters
4102 * can be modified with the SCTP_ASSOCINFO socket option.
4104 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4105 sp->assocparams.sasoc_number_peer_destinations = 0;
4106 sp->assocparams.sasoc_peer_rwnd = 0;
4107 sp->assocparams.sasoc_local_rwnd = 0;
4108 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4110 /* Initialize default event subscriptions. By default, all the
4113 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4115 /* Default Peer Address Parameters. These defaults can
4116 * be modified via SCTP_PEER_ADDR_PARAMS
4118 sp->hbinterval = net->sctp.hb_interval;
4119 sp->pathmaxrxt = net->sctp.max_retrans_path;
4120 sp->pathmtu = 0; /* allow default discovery */
4121 sp->sackdelay = net->sctp.sack_timeout;
4123 sp->param_flags = SPP_HB_ENABLE |
4125 SPP_SACKDELAY_ENABLE;
4127 /* If enabled no SCTP message fragmentation will be performed.
4128 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4130 sp->disable_fragments = 0;
4132 /* Enable Nagle algorithm by default. */
4135 sp->recvrcvinfo = 0;
4136 sp->recvnxtinfo = 0;
4138 /* Enable by default. */
4141 /* Auto-close idle associations after the configured
4142 * number of seconds. A value of 0 disables this
4143 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4144 * for UDP-style sockets only.
4148 /* User specified fragmentation limit. */
4151 sp->adaptation_ind = 0;
4153 sp->pf = sctp_get_pf_specific(sk->sk_family);
4155 /* Control variables for partial data delivery. */
4156 atomic_set(&sp->pd_mode, 0);
4157 skb_queue_head_init(&sp->pd_lobby);
4158 sp->frag_interleave = 0;
4160 /* Create a per socket endpoint structure. Even if we
4161 * change the data structure relationships, this may still
4162 * be useful for storing pre-connect address information.
4164 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4170 sk->sk_destruct = sctp_destruct_sock;
4172 SCTP_DBG_OBJCNT_INC(sock);
4175 sk_sockets_allocated_inc(sk);
4176 sock_prot_inuse_add(net, sk->sk_prot, 1);
4183 /* Cleanup any SCTP per socket resources. Must be called with
4184 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4186 static void sctp_destroy_sock(struct sock *sk)
4188 struct sctp_sock *sp;
4190 pr_debug("%s: sk:%p\n", __func__, sk);
4192 /* Release our hold on the endpoint. */
4194 /* This could happen during socket init, thus we bail out
4195 * early, since the rest of the below is not setup either.
4200 if (sp->do_auto_asconf) {
4201 sp->do_auto_asconf = 0;
4202 list_del(&sp->auto_asconf_list);
4204 sctp_endpoint_free(sp->ep);
4206 sk_sockets_allocated_dec(sk);
4207 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4211 /* Triggered when there are no references on the socket anymore */
4212 static void sctp_destruct_sock(struct sock *sk)
4214 struct sctp_sock *sp = sctp_sk(sk);
4216 /* Free up the HMAC transform. */
4217 crypto_free_hash(sp->hmac);
4219 inet_sock_destruct(sk);
4222 /* API 4.1.7 shutdown() - TCP Style Syntax
4223 * int shutdown(int socket, int how);
4225 * sd - the socket descriptor of the association to be closed.
4226 * how - Specifies the type of shutdown. The values are
4229 * Disables further receive operations. No SCTP
4230 * protocol action is taken.
4232 * Disables further send operations, and initiates
4233 * the SCTP shutdown sequence.
4235 * Disables further send and receive operations
4236 * and initiates the SCTP shutdown sequence.
4238 static void sctp_shutdown(struct sock *sk, int how)
4240 struct net *net = sock_net(sk);
4241 struct sctp_endpoint *ep;
4242 struct sctp_association *asoc;
4244 if (!sctp_style(sk, TCP))
4247 if (how & SEND_SHUTDOWN) {
4248 ep = sctp_sk(sk)->ep;
4249 if (!list_empty(&ep->asocs)) {
4250 asoc = list_entry(ep->asocs.next,
4251 struct sctp_association, asocs);
4252 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4257 /* 7.2.1 Association Status (SCTP_STATUS)
4259 * Applications can retrieve current status information about an
4260 * association, including association state, peer receiver window size,
4261 * number of unacked data chunks, and number of data chunks pending
4262 * receipt. This information is read-only.
4264 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4265 char __user *optval,
4268 struct sctp_status status;
4269 struct sctp_association *asoc = NULL;
4270 struct sctp_transport *transport;
4271 sctp_assoc_t associd;
4274 if (len < sizeof(status)) {
4279 len = sizeof(status);
4280 if (copy_from_user(&status, optval, len)) {
4285 associd = status.sstat_assoc_id;
4286 asoc = sctp_id2assoc(sk, associd);
4292 transport = asoc->peer.primary_path;
4294 status.sstat_assoc_id = sctp_assoc2id(asoc);
4295 status.sstat_state = sctp_assoc_to_state(asoc);
4296 status.sstat_rwnd = asoc->peer.rwnd;
4297 status.sstat_unackdata = asoc->unack_data;
4299 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4300 status.sstat_instrms = asoc->c.sinit_max_instreams;
4301 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4302 status.sstat_fragmentation_point = asoc->frag_point;
4303 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4304 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4305 transport->af_specific->sockaddr_len);
4306 /* Map ipv4 address into v4-mapped-on-v6 address. */
4307 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4308 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4309 status.sstat_primary.spinfo_state = transport->state;
4310 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4311 status.sstat_primary.spinfo_srtt = transport->srtt;
4312 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4313 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4315 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4316 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4318 if (put_user(len, optlen)) {
4323 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4324 __func__, len, status.sstat_state, status.sstat_rwnd,
4325 status.sstat_assoc_id);
4327 if (copy_to_user(optval, &status, len)) {
4337 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4339 * Applications can retrieve information about a specific peer address
4340 * of an association, including its reachability state, congestion
4341 * window, and retransmission timer values. This information is
4344 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4345 char __user *optval,
4348 struct sctp_paddrinfo pinfo;
4349 struct sctp_transport *transport;
4352 if (len < sizeof(pinfo)) {
4357 len = sizeof(pinfo);
4358 if (copy_from_user(&pinfo, optval, len)) {
4363 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4364 pinfo.spinfo_assoc_id);
4368 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4369 pinfo.spinfo_state = transport->state;
4370 pinfo.spinfo_cwnd = transport->cwnd;
4371 pinfo.spinfo_srtt = transport->srtt;
4372 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4373 pinfo.spinfo_mtu = transport->pathmtu;
4375 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4376 pinfo.spinfo_state = SCTP_ACTIVE;
4378 if (put_user(len, optlen)) {
4383 if (copy_to_user(optval, &pinfo, len)) {
4392 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4394 * This option is a on/off flag. If enabled no SCTP message
4395 * fragmentation will be performed. Instead if a message being sent
4396 * exceeds the current PMTU size, the message will NOT be sent and
4397 * instead a error will be indicated to the user.
4399 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4400 char __user *optval, int __user *optlen)
4404 if (len < sizeof(int))
4408 val = (sctp_sk(sk)->disable_fragments == 1);
4409 if (put_user(len, optlen))
4411 if (copy_to_user(optval, &val, len))
4416 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4418 * This socket option is used to specify various notifications and
4419 * ancillary data the user wishes to receive.
4421 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4426 if (len > sizeof(struct sctp_event_subscribe))
4427 len = sizeof(struct sctp_event_subscribe);
4428 if (put_user(len, optlen))
4430 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4435 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4437 * This socket option is applicable to the UDP-style socket only. When
4438 * set it will cause associations that are idle for more than the
4439 * specified number of seconds to automatically close. An association
4440 * being idle is defined an association that has NOT sent or received
4441 * user data. The special value of '0' indicates that no automatic
4442 * close of any associations should be performed. The option expects an
4443 * integer defining the number of seconds of idle time before an
4444 * association is closed.
4446 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4448 /* Applicable to UDP-style socket only */
4449 if (sctp_style(sk, TCP))
4451 if (len < sizeof(int))
4454 if (put_user(len, optlen))
4456 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
4461 /* Helper routine to branch off an association to a new socket. */
4462 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4464 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4465 struct sctp_sock *sp = sctp_sk(sk);
4466 struct socket *sock;
4469 /* Do not peel off from one netns to another one. */
4470 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
4476 /* An association cannot be branched off from an already peeled-off
4477 * socket, nor is this supported for tcp style sockets.
4479 if (!sctp_style(sk, UDP))
4482 /* Create a new socket. */
4483 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4487 sctp_copy_sock(sock->sk, sk, asoc);
4489 /* Make peeled-off sockets more like 1-1 accepted sockets.
4490 * Set the daddr and initialize id to something more random
4492 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4494 /* Populate the fields of the newsk from the oldsk and migrate the
4495 * asoc to the newsk.
4497 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4503 EXPORT_SYMBOL(sctp_do_peeloff);
4505 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4507 sctp_peeloff_arg_t peeloff;
4508 struct socket *newsock;
4509 struct file *newfile;
4512 if (len < sizeof(sctp_peeloff_arg_t))
4514 len = sizeof(sctp_peeloff_arg_t);
4515 if (copy_from_user(&peeloff, optval, len))
4518 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4522 /* Map the socket to an unused fd that can be returned to the user. */
4523 retval = get_unused_fd_flags(0);
4525 sock_release(newsock);
4529 newfile = sock_alloc_file(newsock, 0, NULL);
4530 if (IS_ERR(newfile)) {
4531 put_unused_fd(retval);
4532 sock_release(newsock);
4533 return PTR_ERR(newfile);
4536 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4539 /* Return the fd mapped to the new socket. */
4540 if (put_user(len, optlen)) {
4542 put_unused_fd(retval);
4545 peeloff.sd = retval;
4546 if (copy_to_user(optval, &peeloff, len)) {
4548 put_unused_fd(retval);
4551 fd_install(retval, newfile);
4556 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4558 * Applications can enable or disable heartbeats for any peer address of
4559 * an association, modify an address's heartbeat interval, force a
4560 * heartbeat to be sent immediately, and adjust the address's maximum
4561 * number of retransmissions sent before an address is considered
4562 * unreachable. The following structure is used to access and modify an
4563 * address's parameters:
4565 * struct sctp_paddrparams {
4566 * sctp_assoc_t spp_assoc_id;
4567 * struct sockaddr_storage spp_address;
4568 * uint32_t spp_hbinterval;
4569 * uint16_t spp_pathmaxrxt;
4570 * uint32_t spp_pathmtu;
4571 * uint32_t spp_sackdelay;
4572 * uint32_t spp_flags;
4575 * spp_assoc_id - (one-to-many style socket) This is filled in the
4576 * application, and identifies the association for
4578 * spp_address - This specifies which address is of interest.
4579 * spp_hbinterval - This contains the value of the heartbeat interval,
4580 * in milliseconds. If a value of zero
4581 * is present in this field then no changes are to
4582 * be made to this parameter.
4583 * spp_pathmaxrxt - This contains the maximum number of
4584 * retransmissions before this address shall be
4585 * considered unreachable. If a value of zero
4586 * is present in this field then no changes are to
4587 * be made to this parameter.
4588 * spp_pathmtu - When Path MTU discovery is disabled the value
4589 * specified here will be the "fixed" path mtu.
4590 * Note that if the spp_address field is empty
4591 * then all associations on this address will
4592 * have this fixed path mtu set upon them.
4594 * spp_sackdelay - When delayed sack is enabled, this value specifies
4595 * the number of milliseconds that sacks will be delayed
4596 * for. This value will apply to all addresses of an
4597 * association if the spp_address field is empty. Note
4598 * also, that if delayed sack is enabled and this
4599 * value is set to 0, no change is made to the last
4600 * recorded delayed sack timer value.
4602 * spp_flags - These flags are used to control various features
4603 * on an association. The flag field may contain
4604 * zero or more of the following options.
4606 * SPP_HB_ENABLE - Enable heartbeats on the
4607 * specified address. Note that if the address
4608 * field is empty all addresses for the association
4609 * have heartbeats enabled upon them.
4611 * SPP_HB_DISABLE - Disable heartbeats on the
4612 * speicifed address. Note that if the address
4613 * field is empty all addresses for the association
4614 * will have their heartbeats disabled. Note also
4615 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4616 * mutually exclusive, only one of these two should
4617 * be specified. Enabling both fields will have
4618 * undetermined results.
4620 * SPP_HB_DEMAND - Request a user initiated heartbeat
4621 * to be made immediately.
4623 * SPP_PMTUD_ENABLE - This field will enable PMTU
4624 * discovery upon the specified address. Note that
4625 * if the address feild is empty then all addresses
4626 * on the association are effected.
4628 * SPP_PMTUD_DISABLE - This field will disable PMTU
4629 * discovery upon the specified address. Note that
4630 * if the address feild is empty then all addresses
4631 * on the association are effected. Not also that
4632 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4633 * exclusive. Enabling both will have undetermined
4636 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4637 * on delayed sack. The time specified in spp_sackdelay
4638 * is used to specify the sack delay for this address. Note
4639 * that if spp_address is empty then all addresses will
4640 * enable delayed sack and take on the sack delay
4641 * value specified in spp_sackdelay.
4642 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4643 * off delayed sack. If the spp_address field is blank then
4644 * delayed sack is disabled for the entire association. Note
4645 * also that this field is mutually exclusive to
4646 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4649 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4650 char __user *optval, int __user *optlen)
4652 struct sctp_paddrparams params;
4653 struct sctp_transport *trans = NULL;
4654 struct sctp_association *asoc = NULL;
4655 struct sctp_sock *sp = sctp_sk(sk);
4657 if (len < sizeof(struct sctp_paddrparams))
4659 len = sizeof(struct sctp_paddrparams);
4660 if (copy_from_user(¶ms, optval, len))
4663 /* If an address other than INADDR_ANY is specified, and
4664 * no transport is found, then the request is invalid.
4666 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4667 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4668 params.spp_assoc_id);
4670 pr_debug("%s: failed no transport\n", __func__);
4675 /* Get association, if assoc_id != 0 and the socket is a one
4676 * to many style socket, and an association was not found, then
4677 * the id was invalid.
4679 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4680 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4681 pr_debug("%s: failed no association\n", __func__);
4686 /* Fetch transport values. */
4687 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4688 params.spp_pathmtu = trans->pathmtu;
4689 params.spp_pathmaxrxt = trans->pathmaxrxt;
4690 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4692 /*draft-11 doesn't say what to return in spp_flags*/
4693 params.spp_flags = trans->param_flags;
4695 /* Fetch association values. */
4696 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4697 params.spp_pathmtu = asoc->pathmtu;
4698 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4699 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4701 /*draft-11 doesn't say what to return in spp_flags*/
4702 params.spp_flags = asoc->param_flags;
4704 /* Fetch socket values. */
4705 params.spp_hbinterval = sp->hbinterval;
4706 params.spp_pathmtu = sp->pathmtu;
4707 params.spp_sackdelay = sp->sackdelay;
4708 params.spp_pathmaxrxt = sp->pathmaxrxt;
4710 /*draft-11 doesn't say what to return in spp_flags*/
4711 params.spp_flags = sp->param_flags;
4714 if (copy_to_user(optval, ¶ms, len))
4717 if (put_user(len, optlen))
4724 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4726 * This option will effect the way delayed acks are performed. This
4727 * option allows you to get or set the delayed ack time, in
4728 * milliseconds. It also allows changing the delayed ack frequency.
4729 * Changing the frequency to 1 disables the delayed sack algorithm. If
4730 * the assoc_id is 0, then this sets or gets the endpoints default
4731 * values. If the assoc_id field is non-zero, then the set or get
4732 * effects the specified association for the one to many model (the
4733 * assoc_id field is ignored by the one to one model). Note that if
4734 * sack_delay or sack_freq are 0 when setting this option, then the
4735 * current values will remain unchanged.
4737 * struct sctp_sack_info {
4738 * sctp_assoc_t sack_assoc_id;
4739 * uint32_t sack_delay;
4740 * uint32_t sack_freq;
4743 * sack_assoc_id - This parameter, indicates which association the user
4744 * is performing an action upon. Note that if this field's value is
4745 * zero then the endpoints default value is changed (effecting future
4746 * associations only).
4748 * sack_delay - This parameter contains the number of milliseconds that
4749 * the user is requesting the delayed ACK timer be set to. Note that
4750 * this value is defined in the standard to be between 200 and 500
4753 * sack_freq - This parameter contains the number of packets that must
4754 * be received before a sack is sent without waiting for the delay
4755 * timer to expire. The default value for this is 2, setting this
4756 * value to 1 will disable the delayed sack algorithm.
4758 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4759 char __user *optval,
4762 struct sctp_sack_info params;
4763 struct sctp_association *asoc = NULL;
4764 struct sctp_sock *sp = sctp_sk(sk);
4766 if (len >= sizeof(struct sctp_sack_info)) {
4767 len = sizeof(struct sctp_sack_info);
4769 if (copy_from_user(¶ms, optval, len))
4771 } else if (len == sizeof(struct sctp_assoc_value)) {
4772 pr_warn_ratelimited(DEPRECATED
4774 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4775 "Use struct sctp_sack_info instead\n",
4776 current->comm, task_pid_nr(current));
4777 if (copy_from_user(¶ms, optval, len))
4782 /* Get association, if sack_assoc_id != 0 and the socket is a one
4783 * to many style socket, and an association was not found, then
4784 * the id was invalid.
4786 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4787 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4791 /* Fetch association values. */
4792 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4793 params.sack_delay = jiffies_to_msecs(
4795 params.sack_freq = asoc->sackfreq;
4798 params.sack_delay = 0;
4799 params.sack_freq = 1;
4802 /* Fetch socket values. */
4803 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4804 params.sack_delay = sp->sackdelay;
4805 params.sack_freq = sp->sackfreq;
4807 params.sack_delay = 0;
4808 params.sack_freq = 1;
4812 if (copy_to_user(optval, ¶ms, len))
4815 if (put_user(len, optlen))
4821 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4823 * Applications can specify protocol parameters for the default association
4824 * initialization. The option name argument to setsockopt() and getsockopt()
4827 * Setting initialization parameters is effective only on an unconnected
4828 * socket (for UDP-style sockets only future associations are effected
4829 * by the change). With TCP-style sockets, this option is inherited by
4830 * sockets derived from a listener socket.
4832 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4834 if (len < sizeof(struct sctp_initmsg))
4836 len = sizeof(struct sctp_initmsg);
4837 if (put_user(len, optlen))
4839 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4845 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4846 char __user *optval, int __user *optlen)
4848 struct sctp_association *asoc;
4850 struct sctp_getaddrs getaddrs;
4851 struct sctp_transport *from;
4853 union sctp_addr temp;
4854 struct sctp_sock *sp = sctp_sk(sk);
4859 if (len < sizeof(struct sctp_getaddrs))
4862 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4865 /* For UDP-style sockets, id specifies the association to query. */
4866 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4870 to = optval + offsetof(struct sctp_getaddrs, addrs);
4871 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4873 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4875 memcpy(&temp, &from->ipaddr, sizeof(temp));
4876 addrlen = sctp_get_pf_specific(sk->sk_family)
4877 ->addr_to_user(sp, &temp);
4878 if (space_left < addrlen)
4880 if (copy_to_user(to, &temp, addrlen))
4884 space_left -= addrlen;
4887 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4889 bytes_copied = ((char __user *)to) - optval;
4890 if (put_user(bytes_copied, optlen))
4896 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4897 size_t space_left, int *bytes_copied)
4899 struct sctp_sockaddr_entry *addr;
4900 union sctp_addr temp;
4903 struct net *net = sock_net(sk);
4906 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4910 if ((PF_INET == sk->sk_family) &&
4911 (AF_INET6 == addr->a.sa.sa_family))
4913 if ((PF_INET6 == sk->sk_family) &&
4914 inet_v6_ipv6only(sk) &&
4915 (AF_INET == addr->a.sa.sa_family))
4917 memcpy(&temp, &addr->a, sizeof(temp));
4918 if (!temp.v4.sin_port)
4919 temp.v4.sin_port = htons(port);
4921 addrlen = sctp_get_pf_specific(sk->sk_family)
4922 ->addr_to_user(sctp_sk(sk), &temp);
4924 if (space_left < addrlen) {
4928 memcpy(to, &temp, addrlen);
4932 space_left -= addrlen;
4933 *bytes_copied += addrlen;
4941 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4942 char __user *optval, int __user *optlen)
4944 struct sctp_bind_addr *bp;
4945 struct sctp_association *asoc;
4947 struct sctp_getaddrs getaddrs;
4948 struct sctp_sockaddr_entry *addr;
4950 union sctp_addr temp;
4951 struct sctp_sock *sp = sctp_sk(sk);
4955 int bytes_copied = 0;
4959 if (len < sizeof(struct sctp_getaddrs))
4962 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4966 * For UDP-style sockets, id specifies the association to query.
4967 * If the id field is set to the value '0' then the locally bound
4968 * addresses are returned without regard to any particular
4971 if (0 == getaddrs.assoc_id) {
4972 bp = &sctp_sk(sk)->ep->base.bind_addr;
4974 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4977 bp = &asoc->base.bind_addr;
4980 to = optval + offsetof(struct sctp_getaddrs, addrs);
4981 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4983 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
4987 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4988 * addresses from the global local address list.
4990 if (sctp_list_single_entry(&bp->address_list)) {
4991 addr = list_entry(bp->address_list.next,
4992 struct sctp_sockaddr_entry, list);
4993 if (sctp_is_any(sk, &addr->a)) {
4994 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4995 space_left, &bytes_copied);
5005 /* Protection on the bound address list is not needed since
5006 * in the socket option context we hold a socket lock and
5007 * thus the bound address list can't change.
5009 list_for_each_entry(addr, &bp->address_list, list) {
5010 memcpy(&temp, &addr->a, sizeof(temp));
5011 addrlen = sctp_get_pf_specific(sk->sk_family)
5012 ->addr_to_user(sp, &temp);
5013 if (space_left < addrlen) {
5014 err = -ENOMEM; /*fixme: right error?*/
5017 memcpy(buf, &temp, addrlen);
5019 bytes_copied += addrlen;
5021 space_left -= addrlen;
5025 if (copy_to_user(to, addrs, bytes_copied)) {
5029 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5033 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5034 * but we can't change it anymore.
5036 if (put_user(bytes_copied, optlen))
5043 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5045 * Requests that the local SCTP stack use the enclosed peer address as
5046 * the association primary. The enclosed address must be one of the
5047 * association peer's addresses.
5049 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5050 char __user *optval, int __user *optlen)
5052 struct sctp_prim prim;
5053 struct sctp_association *asoc;
5054 struct sctp_sock *sp = sctp_sk(sk);
5056 if (len < sizeof(struct sctp_prim))
5059 len = sizeof(struct sctp_prim);
5061 if (copy_from_user(&prim, optval, len))
5064 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5068 if (!asoc->peer.primary_path)
5071 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5072 asoc->peer.primary_path->af_specific->sockaddr_len);
5074 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5075 (union sctp_addr *)&prim.ssp_addr);
5077 if (put_user(len, optlen))
5079 if (copy_to_user(optval, &prim, len))
5086 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5088 * Requests that the local endpoint set the specified Adaptation Layer
5089 * Indication parameter for all future INIT and INIT-ACK exchanges.
5091 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5092 char __user *optval, int __user *optlen)
5094 struct sctp_setadaptation adaptation;
5096 if (len < sizeof(struct sctp_setadaptation))
5099 len = sizeof(struct sctp_setadaptation);
5101 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5103 if (put_user(len, optlen))
5105 if (copy_to_user(optval, &adaptation, len))
5113 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5115 * Applications that wish to use the sendto() system call may wish to
5116 * specify a default set of parameters that would normally be supplied
5117 * through the inclusion of ancillary data. This socket option allows
5118 * such an application to set the default sctp_sndrcvinfo structure.
5121 * The application that wishes to use this socket option simply passes
5122 * in to this call the sctp_sndrcvinfo structure defined in Section
5123 * 5.2.2) The input parameters accepted by this call include
5124 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5125 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5126 * to this call if the caller is using the UDP model.
5128 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5130 static int sctp_getsockopt_default_send_param(struct sock *sk,
5131 int len, char __user *optval,
5134 struct sctp_sock *sp = sctp_sk(sk);
5135 struct sctp_association *asoc;
5136 struct sctp_sndrcvinfo info;
5138 if (len < sizeof(info))
5143 if (copy_from_user(&info, optval, len))
5146 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5147 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5150 info.sinfo_stream = asoc->default_stream;
5151 info.sinfo_flags = asoc->default_flags;
5152 info.sinfo_ppid = asoc->default_ppid;
5153 info.sinfo_context = asoc->default_context;
5154 info.sinfo_timetolive = asoc->default_timetolive;
5156 info.sinfo_stream = sp->default_stream;
5157 info.sinfo_flags = sp->default_flags;
5158 info.sinfo_ppid = sp->default_ppid;
5159 info.sinfo_context = sp->default_context;
5160 info.sinfo_timetolive = sp->default_timetolive;
5163 if (put_user(len, optlen))
5165 if (copy_to_user(optval, &info, len))
5171 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5172 * (SCTP_DEFAULT_SNDINFO)
5174 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5175 char __user *optval,
5178 struct sctp_sock *sp = sctp_sk(sk);
5179 struct sctp_association *asoc;
5180 struct sctp_sndinfo info;
5182 if (len < sizeof(info))
5187 if (copy_from_user(&info, optval, len))
5190 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5191 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5194 info.snd_sid = asoc->default_stream;
5195 info.snd_flags = asoc->default_flags;
5196 info.snd_ppid = asoc->default_ppid;
5197 info.snd_context = asoc->default_context;
5199 info.snd_sid = sp->default_stream;
5200 info.snd_flags = sp->default_flags;
5201 info.snd_ppid = sp->default_ppid;
5202 info.snd_context = sp->default_context;
5205 if (put_user(len, optlen))
5207 if (copy_to_user(optval, &info, len))
5215 * 7.1.5 SCTP_NODELAY
5217 * Turn on/off any Nagle-like algorithm. This means that packets are
5218 * generally sent as soon as possible and no unnecessary delays are
5219 * introduced, at the cost of more packets in the network. Expects an
5220 * integer boolean flag.
5223 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5224 char __user *optval, int __user *optlen)
5228 if (len < sizeof(int))
5232 val = (sctp_sk(sk)->nodelay == 1);
5233 if (put_user(len, optlen))
5235 if (copy_to_user(optval, &val, len))
5242 * 7.1.1 SCTP_RTOINFO
5244 * The protocol parameters used to initialize and bound retransmission
5245 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5246 * and modify these parameters.
5247 * All parameters are time values, in milliseconds. A value of 0, when
5248 * modifying the parameters, indicates that the current value should not
5252 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5253 char __user *optval,
5254 int __user *optlen) {
5255 struct sctp_rtoinfo rtoinfo;
5256 struct sctp_association *asoc;
5258 if (len < sizeof (struct sctp_rtoinfo))
5261 len = sizeof(struct sctp_rtoinfo);
5263 if (copy_from_user(&rtoinfo, optval, len))
5266 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5268 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5271 /* Values corresponding to the specific association. */
5273 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5274 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5275 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5277 /* Values corresponding to the endpoint. */
5278 struct sctp_sock *sp = sctp_sk(sk);
5280 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5281 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5282 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5285 if (put_user(len, optlen))
5288 if (copy_to_user(optval, &rtoinfo, len))
5296 * 7.1.2 SCTP_ASSOCINFO
5298 * This option is used to tune the maximum retransmission attempts
5299 * of the association.
5300 * Returns an error if the new association retransmission value is
5301 * greater than the sum of the retransmission value of the peer.
5302 * See [SCTP] for more information.
5305 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5306 char __user *optval,
5310 struct sctp_assocparams assocparams;
5311 struct sctp_association *asoc;
5312 struct list_head *pos;
5315 if (len < sizeof (struct sctp_assocparams))
5318 len = sizeof(struct sctp_assocparams);
5320 if (copy_from_user(&assocparams, optval, len))
5323 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5325 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5328 /* Values correspoinding to the specific association */
5330 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5331 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5332 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5333 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5335 list_for_each(pos, &asoc->peer.transport_addr_list) {
5339 assocparams.sasoc_number_peer_destinations = cnt;
5341 /* Values corresponding to the endpoint */
5342 struct sctp_sock *sp = sctp_sk(sk);
5344 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5345 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5346 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5347 assocparams.sasoc_cookie_life =
5348 sp->assocparams.sasoc_cookie_life;
5349 assocparams.sasoc_number_peer_destinations =
5351 sasoc_number_peer_destinations;
5354 if (put_user(len, optlen))
5357 if (copy_to_user(optval, &assocparams, len))
5364 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5366 * This socket option is a boolean flag which turns on or off mapped V4
5367 * addresses. If this option is turned on and the socket is type
5368 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5369 * If this option is turned off, then no mapping will be done of V4
5370 * addresses and a user will receive both PF_INET6 and PF_INET type
5371 * addresses on the socket.
5373 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5374 char __user *optval, int __user *optlen)
5377 struct sctp_sock *sp = sctp_sk(sk);
5379 if (len < sizeof(int))
5384 if (put_user(len, optlen))
5386 if (copy_to_user(optval, &val, len))
5393 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5394 * (chapter and verse is quoted at sctp_setsockopt_context())
5396 static int sctp_getsockopt_context(struct sock *sk, int len,
5397 char __user *optval, int __user *optlen)
5399 struct sctp_assoc_value params;
5400 struct sctp_sock *sp;
5401 struct sctp_association *asoc;
5403 if (len < sizeof(struct sctp_assoc_value))
5406 len = sizeof(struct sctp_assoc_value);
5408 if (copy_from_user(¶ms, optval, len))
5413 if (params.assoc_id != 0) {
5414 asoc = sctp_id2assoc(sk, params.assoc_id);
5417 params.assoc_value = asoc->default_rcv_context;
5419 params.assoc_value = sp->default_rcv_context;
5422 if (put_user(len, optlen))
5424 if (copy_to_user(optval, ¶ms, len))
5431 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5432 * This option will get or set the maximum size to put in any outgoing
5433 * SCTP DATA chunk. If a message is larger than this size it will be
5434 * fragmented by SCTP into the specified size. Note that the underlying
5435 * SCTP implementation may fragment into smaller sized chunks when the
5436 * PMTU of the underlying association is smaller than the value set by
5437 * the user. The default value for this option is '0' which indicates
5438 * the user is NOT limiting fragmentation and only the PMTU will effect
5439 * SCTP's choice of DATA chunk size. Note also that values set larger
5440 * than the maximum size of an IP datagram will effectively let SCTP
5441 * control fragmentation (i.e. the same as setting this option to 0).
5443 * The following structure is used to access and modify this parameter:
5445 * struct sctp_assoc_value {
5446 * sctp_assoc_t assoc_id;
5447 * uint32_t assoc_value;
5450 * assoc_id: This parameter is ignored for one-to-one style sockets.
5451 * For one-to-many style sockets this parameter indicates which
5452 * association the user is performing an action upon. Note that if
5453 * this field's value is zero then the endpoints default value is
5454 * changed (effecting future associations only).
5455 * assoc_value: This parameter specifies the maximum size in bytes.
5457 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5458 char __user *optval, int __user *optlen)
5460 struct sctp_assoc_value params;
5461 struct sctp_association *asoc;
5463 if (len == sizeof(int)) {
5464 pr_warn_ratelimited(DEPRECATED
5466 "Use of int in maxseg socket option.\n"
5467 "Use struct sctp_assoc_value instead\n",
5468 current->comm, task_pid_nr(current));
5469 params.assoc_id = 0;
5470 } else if (len >= sizeof(struct sctp_assoc_value)) {
5471 len = sizeof(struct sctp_assoc_value);
5472 if (copy_from_user(¶ms, optval, len))
5477 asoc = sctp_id2assoc(sk, params.assoc_id);
5478 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5482 params.assoc_value = asoc->frag_point;
5484 params.assoc_value = sctp_sk(sk)->user_frag;
5486 if (put_user(len, optlen))
5488 if (len == sizeof(int)) {
5489 if (copy_to_user(optval, ¶ms.assoc_value, len))
5492 if (copy_to_user(optval, ¶ms, len))
5500 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5501 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5503 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5504 char __user *optval, int __user *optlen)
5508 if (len < sizeof(int))
5513 val = sctp_sk(sk)->frag_interleave;
5514 if (put_user(len, optlen))
5516 if (copy_to_user(optval, &val, len))
5523 * 7.1.25. Set or Get the sctp partial delivery point
5524 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5526 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5527 char __user *optval,
5532 if (len < sizeof(u32))
5537 val = sctp_sk(sk)->pd_point;
5538 if (put_user(len, optlen))
5540 if (copy_to_user(optval, &val, len))
5547 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5548 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5550 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5551 char __user *optval,
5554 struct sctp_assoc_value params;
5555 struct sctp_sock *sp;
5556 struct sctp_association *asoc;
5558 if (len == sizeof(int)) {
5559 pr_warn_ratelimited(DEPRECATED
5561 "Use of int in max_burst socket option.\n"
5562 "Use struct sctp_assoc_value instead\n",
5563 current->comm, task_pid_nr(current));
5564 params.assoc_id = 0;
5565 } else if (len >= sizeof(struct sctp_assoc_value)) {
5566 len = sizeof(struct sctp_assoc_value);
5567 if (copy_from_user(¶ms, optval, len))
5574 if (params.assoc_id != 0) {
5575 asoc = sctp_id2assoc(sk, params.assoc_id);
5578 params.assoc_value = asoc->max_burst;
5580 params.assoc_value = sp->max_burst;
5582 if (len == sizeof(int)) {
5583 if (copy_to_user(optval, ¶ms.assoc_value, len))
5586 if (copy_to_user(optval, ¶ms, len))
5594 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5595 char __user *optval, int __user *optlen)
5597 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5598 struct sctp_hmacalgo __user *p = (void __user *)optval;
5599 struct sctp_hmac_algo_param *hmacs;
5604 if (!ep->auth_enable)
5607 hmacs = ep->auth_hmacs_list;
5608 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5610 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5613 len = sizeof(struct sctp_hmacalgo) + data_len;
5614 num_idents = data_len / sizeof(u16);
5616 if (put_user(len, optlen))
5618 if (put_user(num_idents, &p->shmac_num_idents))
5620 for (i = 0; i < num_idents; i++) {
5621 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
5623 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
5629 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5630 char __user *optval, int __user *optlen)
5632 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5633 struct sctp_authkeyid val;
5634 struct sctp_association *asoc;
5636 if (!ep->auth_enable)
5639 if (len < sizeof(struct sctp_authkeyid))
5642 len = sizeof(struct sctp_authkeyid);
5643 if (copy_from_user(&val, optval, len))
5646 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5647 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5651 val.scact_keynumber = asoc->active_key_id;
5653 val.scact_keynumber = ep->active_key_id;
5655 if (put_user(len, optlen))
5657 if (copy_to_user(optval, &val, len))
5663 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5664 char __user *optval, int __user *optlen)
5666 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5667 struct sctp_authchunks __user *p = (void __user *)optval;
5668 struct sctp_authchunks val;
5669 struct sctp_association *asoc;
5670 struct sctp_chunks_param *ch;
5674 if (!ep->auth_enable)
5677 if (len < sizeof(struct sctp_authchunks))
5680 if (copy_from_user(&val, optval, sizeof(val)))
5683 to = p->gauth_chunks;
5684 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5688 ch = asoc->peer.peer_chunks;
5692 /* See if the user provided enough room for all the data */
5693 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5694 if (len < num_chunks)
5697 if (copy_to_user(to, ch->chunks, num_chunks))
5700 len = sizeof(struct sctp_authchunks) + num_chunks;
5701 if (put_user(len, optlen))
5703 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5708 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5709 char __user *optval, int __user *optlen)
5711 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5712 struct sctp_authchunks __user *p = (void __user *)optval;
5713 struct sctp_authchunks val;
5714 struct sctp_association *asoc;
5715 struct sctp_chunks_param *ch;
5719 if (!ep->auth_enable)
5722 if (len < sizeof(struct sctp_authchunks))
5725 if (copy_from_user(&val, optval, sizeof(val)))
5728 to = p->gauth_chunks;
5729 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5730 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5734 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5736 ch = ep->auth_chunk_list;
5741 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5742 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5745 if (copy_to_user(to, ch->chunks, num_chunks))
5748 len = sizeof(struct sctp_authchunks) + num_chunks;
5749 if (put_user(len, optlen))
5751 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5758 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5759 * This option gets the current number of associations that are attached
5760 * to a one-to-many style socket. The option value is an uint32_t.
5762 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5763 char __user *optval, int __user *optlen)
5765 struct sctp_sock *sp = sctp_sk(sk);
5766 struct sctp_association *asoc;
5769 if (sctp_style(sk, TCP))
5772 if (len < sizeof(u32))
5777 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5781 if (put_user(len, optlen))
5783 if (copy_to_user(optval, &val, len))
5790 * 8.1.23 SCTP_AUTO_ASCONF
5791 * See the corresponding setsockopt entry as description
5793 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5794 char __user *optval, int __user *optlen)
5798 if (len < sizeof(int))
5802 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5804 if (put_user(len, optlen))
5806 if (copy_to_user(optval, &val, len))
5812 * 8.2.6. Get the Current Identifiers of Associations
5813 * (SCTP_GET_ASSOC_ID_LIST)
5815 * This option gets the current list of SCTP association identifiers of
5816 * the SCTP associations handled by a one-to-many style socket.
5818 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5819 char __user *optval, int __user *optlen)
5821 struct sctp_sock *sp = sctp_sk(sk);
5822 struct sctp_association *asoc;
5823 struct sctp_assoc_ids *ids;
5826 if (sctp_style(sk, TCP))
5829 if (len < sizeof(struct sctp_assoc_ids))
5832 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5836 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5839 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5841 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
5845 ids->gaids_number_of_ids = num;
5847 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5848 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5851 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5861 * SCTP_PEER_ADDR_THLDS
5863 * This option allows us to fetch the partially failed threshold for one or all
5864 * transports in an association. See Section 6.1 of:
5865 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5867 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5868 char __user *optval,
5872 struct sctp_paddrthlds val;
5873 struct sctp_transport *trans;
5874 struct sctp_association *asoc;
5876 if (len < sizeof(struct sctp_paddrthlds))
5878 len = sizeof(struct sctp_paddrthlds);
5879 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5882 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5883 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5887 val.spt_pathpfthld = asoc->pf_retrans;
5888 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5890 trans = sctp_addr_id2transport(sk, &val.spt_address,
5895 val.spt_pathmaxrxt = trans->pathmaxrxt;
5896 val.spt_pathpfthld = trans->pf_retrans;
5899 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5906 * SCTP_GET_ASSOC_STATS
5908 * This option retrieves local per endpoint statistics. It is modeled
5909 * after OpenSolaris' implementation
5911 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5912 char __user *optval,
5915 struct sctp_assoc_stats sas;
5916 struct sctp_association *asoc = NULL;
5918 /* User must provide at least the assoc id */
5919 if (len < sizeof(sctp_assoc_t))
5922 /* Allow the struct to grow and fill in as much as possible */
5923 len = min_t(size_t, len, sizeof(sas));
5925 if (copy_from_user(&sas, optval, len))
5928 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5932 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5933 sas.sas_gapcnt = asoc->stats.gapcnt;
5934 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5935 sas.sas_osacks = asoc->stats.osacks;
5936 sas.sas_isacks = asoc->stats.isacks;
5937 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5938 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5939 sas.sas_oodchunks = asoc->stats.oodchunks;
5940 sas.sas_iodchunks = asoc->stats.iodchunks;
5941 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5942 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5943 sas.sas_idupchunks = asoc->stats.idupchunks;
5944 sas.sas_opackets = asoc->stats.opackets;
5945 sas.sas_ipackets = asoc->stats.ipackets;
5947 /* New high max rto observed, will return 0 if not a single
5948 * RTO update took place. obs_rto_ipaddr will be bogus
5951 sas.sas_maxrto = asoc->stats.max_obs_rto;
5952 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5953 sizeof(struct sockaddr_storage));
5955 /* Mark beginning of a new observation period */
5956 asoc->stats.max_obs_rto = asoc->rto_min;
5958 if (put_user(len, optlen))
5961 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5963 if (copy_to_user(optval, &sas, len))
5969 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5970 char __user *optval,
5975 if (len < sizeof(int))
5979 if (sctp_sk(sk)->recvrcvinfo)
5981 if (put_user(len, optlen))
5983 if (copy_to_user(optval, &val, len))
5989 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5990 char __user *optval,
5995 if (len < sizeof(int))
5999 if (sctp_sk(sk)->recvnxtinfo)
6001 if (put_user(len, optlen))
6003 if (copy_to_user(optval, &val, len))
6009 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6010 char __user *optval, int __user *optlen)
6015 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6017 /* I can hardly begin to describe how wrong this is. This is
6018 * so broken as to be worse than useless. The API draft
6019 * REALLY is NOT helpful here... I am not convinced that the
6020 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6021 * are at all well-founded.
6023 if (level != SOL_SCTP) {
6024 struct sctp_af *af = sctp_sk(sk)->pf->af;
6026 retval = af->getsockopt(sk, level, optname, optval, optlen);
6030 if (get_user(len, optlen))
6040 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6042 case SCTP_DISABLE_FRAGMENTS:
6043 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6047 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6049 case SCTP_AUTOCLOSE:
6050 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6052 case SCTP_SOCKOPT_PEELOFF:
6053 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6055 case SCTP_PEER_ADDR_PARAMS:
6056 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6059 case SCTP_DELAYED_SACK:
6060 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6064 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6066 case SCTP_GET_PEER_ADDRS:
6067 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6070 case SCTP_GET_LOCAL_ADDRS:
6071 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6074 case SCTP_SOCKOPT_CONNECTX3:
6075 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6077 case SCTP_DEFAULT_SEND_PARAM:
6078 retval = sctp_getsockopt_default_send_param(sk, len,
6081 case SCTP_DEFAULT_SNDINFO:
6082 retval = sctp_getsockopt_default_sndinfo(sk, len,
6085 case SCTP_PRIMARY_ADDR:
6086 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6089 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6092 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6094 case SCTP_ASSOCINFO:
6095 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6097 case SCTP_I_WANT_MAPPED_V4_ADDR:
6098 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6101 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6103 case SCTP_GET_PEER_ADDR_INFO:
6104 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6107 case SCTP_ADAPTATION_LAYER:
6108 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6112 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6114 case SCTP_FRAGMENT_INTERLEAVE:
6115 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6118 case SCTP_PARTIAL_DELIVERY_POINT:
6119 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6122 case SCTP_MAX_BURST:
6123 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6126 case SCTP_AUTH_CHUNK:
6127 case SCTP_AUTH_DELETE_KEY:
6128 retval = -EOPNOTSUPP;
6130 case SCTP_HMAC_IDENT:
6131 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6133 case SCTP_AUTH_ACTIVE_KEY:
6134 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6136 case SCTP_PEER_AUTH_CHUNKS:
6137 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6140 case SCTP_LOCAL_AUTH_CHUNKS:
6141 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6144 case SCTP_GET_ASSOC_NUMBER:
6145 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6147 case SCTP_GET_ASSOC_ID_LIST:
6148 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6150 case SCTP_AUTO_ASCONF:
6151 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6153 case SCTP_PEER_ADDR_THLDS:
6154 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6156 case SCTP_GET_ASSOC_STATS:
6157 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6159 case SCTP_RECVRCVINFO:
6160 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6162 case SCTP_RECVNXTINFO:
6163 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6166 retval = -ENOPROTOOPT;
6174 static void sctp_hash(struct sock *sk)
6179 static void sctp_unhash(struct sock *sk)
6184 /* Check if port is acceptable. Possibly find first available port.
6186 * The port hash table (contained in the 'global' SCTP protocol storage
6187 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6188 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6189 * list (the list number is the port number hashed out, so as you
6190 * would expect from a hash function, all the ports in a given list have
6191 * such a number that hashes out to the same list number; you were
6192 * expecting that, right?); so each list has a set of ports, with a
6193 * link to the socket (struct sock) that uses it, the port number and
6194 * a fastreuse flag (FIXME: NPI ipg).
6196 static struct sctp_bind_bucket *sctp_bucket_create(
6197 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6199 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6201 struct sctp_bind_hashbucket *head; /* hash list */
6202 struct sctp_bind_bucket *pp;
6203 unsigned short snum;
6206 snum = ntohs(addr->v4.sin_port);
6208 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6211 /* Search for an available port. */
6212 int low, high, remaining, index;
6214 struct net *net = sock_net(sk);
6216 inet_get_local_port_range(net, &low, &high);
6217 remaining = (high - low) + 1;
6218 rover = prandom_u32() % remaining + low;
6222 if ((rover < low) || (rover > high))
6224 if (inet_is_local_reserved_port(net, rover))
6226 index = sctp_phashfn(sock_net(sk), rover);
6227 head = &sctp_port_hashtable[index];
6228 spin_lock_bh(&head->lock);
6229 sctp_for_each_hentry(pp, &head->chain)
6230 if ((pp->port == rover) &&
6231 net_eq(sock_net(sk), pp->net))
6235 spin_unlock_bh(&head->lock);
6237 } while (--remaining > 0);
6239 /* Exhausted local port range during search? */
6244 /* OK, here is the one we will use. HEAD (the port
6245 * hash table list entry) is non-NULL and we hold it's
6250 /* We are given an specific port number; we verify
6251 * that it is not being used. If it is used, we will
6252 * exahust the search in the hash list corresponding
6253 * to the port number (snum) - we detect that with the
6254 * port iterator, pp being NULL.
6256 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6257 spin_lock_bh(&head->lock);
6258 sctp_for_each_hentry(pp, &head->chain) {
6259 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6266 if (!hlist_empty(&pp->owner)) {
6267 /* We had a port hash table hit - there is an
6268 * available port (pp != NULL) and it is being
6269 * used by other socket (pp->owner not empty); that other
6270 * socket is going to be sk2.
6272 int reuse = sk->sk_reuse;
6275 pr_debug("%s: found a possible match\n", __func__);
6277 if (pp->fastreuse && sk->sk_reuse &&
6278 sk->sk_state != SCTP_SS_LISTENING)
6281 /* Run through the list of sockets bound to the port
6282 * (pp->port) [via the pointers bind_next and
6283 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6284 * we get the endpoint they describe and run through
6285 * the endpoint's list of IP (v4 or v6) addresses,
6286 * comparing each of the addresses with the address of
6287 * the socket sk. If we find a match, then that means
6288 * that this port/socket (sk) combination are already
6291 sk_for_each_bound(sk2, &pp->owner) {
6292 struct sctp_endpoint *ep2;
6293 ep2 = sctp_sk(sk2)->ep;
6296 (reuse && sk2->sk_reuse &&
6297 sk2->sk_state != SCTP_SS_LISTENING))
6300 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6301 sctp_sk(sk2), sctp_sk(sk))) {
6307 pr_debug("%s: found a match\n", __func__);
6310 /* If there was a hash table miss, create a new port. */
6312 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6315 /* In either case (hit or miss), make sure fastreuse is 1 only
6316 * if sk->sk_reuse is too (that is, if the caller requested
6317 * SO_REUSEADDR on this socket -sk-).
6319 if (hlist_empty(&pp->owner)) {
6320 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6324 } else if (pp->fastreuse &&
6325 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6328 /* We are set, so fill up all the data in the hash table
6329 * entry, tie the socket list information with the rest of the
6330 * sockets FIXME: Blurry, NPI (ipg).
6333 if (!sctp_sk(sk)->bind_hash) {
6334 inet_sk(sk)->inet_num = snum;
6335 sk_add_bind_node(sk, &pp->owner);
6336 sctp_sk(sk)->bind_hash = pp;
6341 spin_unlock_bh(&head->lock);
6345 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6346 * port is requested.
6348 static int sctp_get_port(struct sock *sk, unsigned short snum)
6350 union sctp_addr addr;
6351 struct sctp_af *af = sctp_sk(sk)->pf->af;
6353 /* Set up a dummy address struct from the sk. */
6354 af->from_sk(&addr, sk);
6355 addr.v4.sin_port = htons(snum);
6357 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6358 return !!sctp_get_port_local(sk, &addr);
6362 * Move a socket to LISTENING state.
6364 static int sctp_listen_start(struct sock *sk, int backlog)
6366 struct sctp_sock *sp = sctp_sk(sk);
6367 struct sctp_endpoint *ep = sp->ep;
6368 struct crypto_hash *tfm = NULL;
6371 /* Allocate HMAC for generating cookie. */
6372 if (!sp->hmac && sp->sctp_hmac_alg) {
6373 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6374 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6376 net_info_ratelimited("failed to load transform for %s: %ld\n",
6377 sp->sctp_hmac_alg, PTR_ERR(tfm));
6380 sctp_sk(sk)->hmac = tfm;
6384 * If a bind() or sctp_bindx() is not called prior to a listen()
6385 * call that allows new associations to be accepted, the system
6386 * picks an ephemeral port and will choose an address set equivalent
6387 * to binding with a wildcard address.
6389 * This is not currently spelled out in the SCTP sockets
6390 * extensions draft, but follows the practice as seen in TCP
6394 sk->sk_state = SCTP_SS_LISTENING;
6395 if (!ep->base.bind_addr.port) {
6396 if (sctp_autobind(sk))
6399 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6400 sk->sk_state = SCTP_SS_CLOSED;
6405 sk->sk_max_ack_backlog = backlog;
6406 sctp_hash_endpoint(ep);
6411 * 4.1.3 / 5.1.3 listen()
6413 * By default, new associations are not accepted for UDP style sockets.
6414 * An application uses listen() to mark a socket as being able to
6415 * accept new associations.
6417 * On TCP style sockets, applications use listen() to ready the SCTP
6418 * endpoint for accepting inbound associations.
6420 * On both types of endpoints a backlog of '0' disables listening.
6422 * Move a socket to LISTENING state.
6424 int sctp_inet_listen(struct socket *sock, int backlog)
6426 struct sock *sk = sock->sk;
6427 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6430 if (unlikely(backlog < 0))
6435 /* Peeled-off sockets are not allowed to listen(). */
6436 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6439 if (sock->state != SS_UNCONNECTED)
6442 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
6445 /* If backlog is zero, disable listening. */
6447 if (sctp_sstate(sk, CLOSED))
6451 sctp_unhash_endpoint(ep);
6452 sk->sk_state = SCTP_SS_CLOSED;
6454 sctp_sk(sk)->bind_hash->fastreuse = 1;
6458 /* If we are already listening, just update the backlog */
6459 if (sctp_sstate(sk, LISTENING))
6460 sk->sk_max_ack_backlog = backlog;
6462 err = sctp_listen_start(sk, backlog);
6474 * This function is done by modeling the current datagram_poll() and the
6475 * tcp_poll(). Note that, based on these implementations, we don't
6476 * lock the socket in this function, even though it seems that,
6477 * ideally, locking or some other mechanisms can be used to ensure
6478 * the integrity of the counters (sndbuf and wmem_alloc) used
6479 * in this place. We assume that we don't need locks either until proven
6482 * Another thing to note is that we include the Async I/O support
6483 * here, again, by modeling the current TCP/UDP code. We don't have
6484 * a good way to test with it yet.
6486 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6488 struct sock *sk = sock->sk;
6489 struct sctp_sock *sp = sctp_sk(sk);
6492 poll_wait(file, sk_sleep(sk), wait);
6494 /* A TCP-style listening socket becomes readable when the accept queue
6497 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6498 return (!list_empty(&sp->ep->asocs)) ?
6499 (POLLIN | POLLRDNORM) : 0;
6503 /* Is there any exceptional events? */
6504 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6506 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6507 if (sk->sk_shutdown & RCV_SHUTDOWN)
6508 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6509 if (sk->sk_shutdown == SHUTDOWN_MASK)
6512 /* Is it readable? Reconsider this code with TCP-style support. */
6513 if (!skb_queue_empty(&sk->sk_receive_queue))
6514 mask |= POLLIN | POLLRDNORM;
6516 /* The association is either gone or not ready. */
6517 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6520 /* Is it writable? */
6521 if (sctp_writeable(sk)) {
6522 mask |= POLLOUT | POLLWRNORM;
6524 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
6526 * Since the socket is not locked, the buffer
6527 * might be made available after the writeable check and
6528 * before the bit is set. This could cause a lost I/O
6529 * signal. tcp_poll() has a race breaker for this race
6530 * condition. Based on their implementation, we put
6531 * in the following code to cover it as well.
6533 if (sctp_writeable(sk))
6534 mask |= POLLOUT | POLLWRNORM;
6539 /********************************************************************
6540 * 2nd Level Abstractions
6541 ********************************************************************/
6543 static struct sctp_bind_bucket *sctp_bucket_create(
6544 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6546 struct sctp_bind_bucket *pp;
6548 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6550 SCTP_DBG_OBJCNT_INC(bind_bucket);
6553 INIT_HLIST_HEAD(&pp->owner);
6555 hlist_add_head(&pp->node, &head->chain);
6560 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6561 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6563 if (pp && hlist_empty(&pp->owner)) {
6564 __hlist_del(&pp->node);
6565 kmem_cache_free(sctp_bucket_cachep, pp);
6566 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6570 /* Release this socket's reference to a local port. */
6571 static inline void __sctp_put_port(struct sock *sk)
6573 struct sctp_bind_hashbucket *head =
6574 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6575 inet_sk(sk)->inet_num)];
6576 struct sctp_bind_bucket *pp;
6578 spin_lock(&head->lock);
6579 pp = sctp_sk(sk)->bind_hash;
6580 __sk_del_bind_node(sk);
6581 sctp_sk(sk)->bind_hash = NULL;
6582 inet_sk(sk)->inet_num = 0;
6583 sctp_bucket_destroy(pp);
6584 spin_unlock(&head->lock);
6587 void sctp_put_port(struct sock *sk)
6590 __sctp_put_port(sk);
6595 * The system picks an ephemeral port and choose an address set equivalent
6596 * to binding with a wildcard address.
6597 * One of those addresses will be the primary address for the association.
6598 * This automatically enables the multihoming capability of SCTP.
6600 static int sctp_autobind(struct sock *sk)
6602 union sctp_addr autoaddr;
6606 /* Initialize a local sockaddr structure to INADDR_ANY. */
6607 af = sctp_sk(sk)->pf->af;
6609 port = htons(inet_sk(sk)->inet_num);
6610 af->inaddr_any(&autoaddr, port);
6612 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6615 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6618 * 4.2 The cmsghdr Structure *
6620 * When ancillary data is sent or received, any number of ancillary data
6621 * objects can be specified by the msg_control and msg_controllen members of
6622 * the msghdr structure, because each object is preceded by
6623 * a cmsghdr structure defining the object's length (the cmsg_len member).
6624 * Historically Berkeley-derived implementations have passed only one object
6625 * at a time, but this API allows multiple objects to be
6626 * passed in a single call to sendmsg() or recvmsg(). The following example
6627 * shows two ancillary data objects in a control buffer.
6629 * |<--------------------------- msg_controllen -------------------------->|
6632 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6634 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6637 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6639 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6642 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6643 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6645 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6647 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6654 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6656 struct cmsghdr *cmsg;
6657 struct msghdr *my_msg = (struct msghdr *)msg;
6659 for_each_cmsghdr(cmsg, my_msg) {
6660 if (!CMSG_OK(my_msg, cmsg))
6663 /* Should we parse this header or ignore? */
6664 if (cmsg->cmsg_level != IPPROTO_SCTP)
6667 /* Strictly check lengths following example in SCM code. */
6668 switch (cmsg->cmsg_type) {
6670 /* SCTP Socket API Extension
6671 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6673 * This cmsghdr structure provides information for
6674 * initializing new SCTP associations with sendmsg().
6675 * The SCTP_INITMSG socket option uses this same data
6676 * structure. This structure is not used for
6679 * cmsg_level cmsg_type cmsg_data[]
6680 * ------------ ------------ ----------------------
6681 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6683 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6686 cmsgs->init = CMSG_DATA(cmsg);
6690 /* SCTP Socket API Extension
6691 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6693 * This cmsghdr structure specifies SCTP options for
6694 * sendmsg() and describes SCTP header information
6695 * about a received message through recvmsg().
6697 * cmsg_level cmsg_type cmsg_data[]
6698 * ------------ ------------ ----------------------
6699 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6701 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6704 cmsgs->srinfo = CMSG_DATA(cmsg);
6706 if (cmsgs->srinfo->sinfo_flags &
6707 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6708 SCTP_SACK_IMMEDIATELY |
6709 SCTP_ABORT | SCTP_EOF))
6714 /* SCTP Socket API Extension
6715 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6717 * This cmsghdr structure specifies SCTP options for
6718 * sendmsg(). This structure and SCTP_RCVINFO replaces
6719 * SCTP_SNDRCV which has been deprecated.
6721 * cmsg_level cmsg_type cmsg_data[]
6722 * ------------ ------------ ---------------------
6723 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6725 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6728 cmsgs->sinfo = CMSG_DATA(cmsg);
6730 if (cmsgs->sinfo->snd_flags &
6731 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6732 SCTP_SACK_IMMEDIATELY |
6733 SCTP_ABORT | SCTP_EOF))
6745 * Wait for a packet..
6746 * Note: This function is the same function as in core/datagram.c
6747 * with a few modifications to make lksctp work.
6749 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6754 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6756 /* Socket errors? */
6757 error = sock_error(sk);
6761 if (!skb_queue_empty(&sk->sk_receive_queue))
6764 /* Socket shut down? */
6765 if (sk->sk_shutdown & RCV_SHUTDOWN)
6768 /* Sequenced packets can come disconnected. If so we report the
6773 /* Is there a good reason to think that we may receive some data? */
6774 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6777 /* Handle signals. */
6778 if (signal_pending(current))
6781 /* Let another process have a go. Since we are going to sleep
6782 * anyway. Note: This may cause odd behaviors if the message
6783 * does not fit in the user's buffer, but this seems to be the
6784 * only way to honor MSG_DONTWAIT realistically.
6787 *timeo_p = schedule_timeout(*timeo_p);
6791 finish_wait(sk_sleep(sk), &wait);
6795 error = sock_intr_errno(*timeo_p);
6798 finish_wait(sk_sleep(sk), &wait);
6803 /* Receive a datagram.
6804 * Note: This is pretty much the same routine as in core/datagram.c
6805 * with a few changes to make lksctp work.
6807 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6808 int noblock, int *err)
6811 struct sk_buff *skb;
6814 timeo = sock_rcvtimeo(sk, noblock);
6816 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6817 MAX_SCHEDULE_TIMEOUT);
6820 /* Again only user level code calls this function,
6821 * so nothing interrupt level
6822 * will suddenly eat the receive_queue.
6824 * Look at current nfs client by the way...
6825 * However, this function was correct in any case. 8)
6827 if (flags & MSG_PEEK) {
6828 spin_lock_bh(&sk->sk_receive_queue.lock);
6829 skb = skb_peek(&sk->sk_receive_queue);
6831 atomic_inc(&skb->users);
6832 spin_unlock_bh(&sk->sk_receive_queue.lock);
6834 skb = skb_dequeue(&sk->sk_receive_queue);
6840 /* Caller is allowed not to check sk->sk_err before calling. */
6841 error = sock_error(sk);
6845 if (sk->sk_shutdown & RCV_SHUTDOWN)
6848 if (sk_can_busy_loop(sk) &&
6849 sk_busy_loop(sk, noblock))
6852 /* User doesn't want to wait. */
6856 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6865 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6866 static void __sctp_write_space(struct sctp_association *asoc)
6868 struct sock *sk = asoc->base.sk;
6870 if (sctp_wspace(asoc) <= 0)
6873 if (waitqueue_active(&asoc->wait))
6874 wake_up_interruptible(&asoc->wait);
6876 if (sctp_writeable(sk)) {
6877 struct socket_wq *wq;
6880 wq = rcu_dereference(sk->sk_wq);
6882 if (waitqueue_active(&wq->wait))
6883 wake_up_interruptible(&wq->wait);
6885 /* Note that we try to include the Async I/O support
6886 * here by modeling from the current TCP/UDP code.
6887 * We have not tested with it yet.
6889 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6890 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
6896 static void sctp_wake_up_waiters(struct sock *sk,
6897 struct sctp_association *asoc)
6899 struct sctp_association *tmp = asoc;
6901 /* We do accounting for the sndbuf space per association,
6902 * so we only need to wake our own association.
6904 if (asoc->ep->sndbuf_policy)
6905 return __sctp_write_space(asoc);
6907 /* If association goes down and is just flushing its
6908 * outq, then just normally notify others.
6910 if (asoc->base.dead)
6911 return sctp_write_space(sk);
6913 /* Accounting for the sndbuf space is per socket, so we
6914 * need to wake up others, try to be fair and in case of
6915 * other associations, let them have a go first instead
6916 * of just doing a sctp_write_space() call.
6918 * Note that we reach sctp_wake_up_waiters() only when
6919 * associations free up queued chunks, thus we are under
6920 * lock and the list of associations on a socket is
6921 * guaranteed not to change.
6923 for (tmp = list_next_entry(tmp, asocs); 1;
6924 tmp = list_next_entry(tmp, asocs)) {
6925 /* Manually skip the head element. */
6926 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6928 /* Wake up association. */
6929 __sctp_write_space(tmp);
6930 /* We've reached the end. */
6936 /* Do accounting for the sndbuf space.
6937 * Decrement the used sndbuf space of the corresponding association by the
6938 * data size which was just transmitted(freed).
6940 static void sctp_wfree(struct sk_buff *skb)
6942 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
6943 struct sctp_association *asoc = chunk->asoc;
6944 struct sock *sk = asoc->base.sk;
6946 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6947 sizeof(struct sk_buff) +
6948 sizeof(struct sctp_chunk);
6950 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6953 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6955 sk->sk_wmem_queued -= skb->truesize;
6956 sk_mem_uncharge(sk, skb->truesize);
6959 sctp_wake_up_waiters(sk, asoc);
6961 sctp_association_put(asoc);
6964 /* Do accounting for the receive space on the socket.
6965 * Accounting for the association is done in ulpevent.c
6966 * We set this as a destructor for the cloned data skbs so that
6967 * accounting is done at the correct time.
6969 void sctp_sock_rfree(struct sk_buff *skb)
6971 struct sock *sk = skb->sk;
6972 struct sctp_ulpevent *event = sctp_skb2event(skb);
6974 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6977 * Mimic the behavior of sock_rfree
6979 sk_mem_uncharge(sk, event->rmem_len);
6983 /* Helper function to wait for space in the sndbuf. */
6984 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6987 struct sock *sk = asoc->base.sk;
6988 long current_timeo = *timeo_p;
6992 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6995 /* Increment the association's refcnt. */
6996 sctp_association_hold(asoc);
6998 /* Wait on the association specific sndbuf space. */
7000 prepare_to_wait_exclusive(&asoc->wait, &wait,
7001 TASK_INTERRUPTIBLE);
7002 if (asoc->base.dead)
7006 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
7008 if (signal_pending(current))
7009 goto do_interrupted;
7010 if (msg_len <= sctp_wspace(asoc))
7013 /* Let another process have a go. Since we are going
7017 current_timeo = schedule_timeout(current_timeo);
7019 if (sk != asoc->base.sk)
7022 *timeo_p = current_timeo;
7026 finish_wait(&asoc->wait, &wait);
7028 /* Release the association's refcnt. */
7029 sctp_association_put(asoc);
7042 err = sock_intr_errno(*timeo_p);
7050 void sctp_data_ready(struct sock *sk)
7052 struct socket_wq *wq;
7055 wq = rcu_dereference(sk->sk_wq);
7056 if (wq_has_sleeper(wq))
7057 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7058 POLLRDNORM | POLLRDBAND);
7059 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7063 /* If socket sndbuf has changed, wake up all per association waiters. */
7064 void sctp_write_space(struct sock *sk)
7066 struct sctp_association *asoc;
7068 /* Wake up the tasks in each wait queue. */
7069 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7070 __sctp_write_space(asoc);
7074 /* Is there any sndbuf space available on the socket?
7076 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7077 * associations on the same socket. For a UDP-style socket with
7078 * multiple associations, it is possible for it to be "unwriteable"
7079 * prematurely. I assume that this is acceptable because
7080 * a premature "unwriteable" is better than an accidental "writeable" which
7081 * would cause an unwanted block under certain circumstances. For the 1-1
7082 * UDP-style sockets or TCP-style sockets, this code should work.
7085 static int sctp_writeable(struct sock *sk)
7089 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7095 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7096 * returns immediately with EINPROGRESS.
7098 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7100 struct sock *sk = asoc->base.sk;
7102 long current_timeo = *timeo_p;
7105 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7107 /* Increment the association's refcnt. */
7108 sctp_association_hold(asoc);
7111 prepare_to_wait_exclusive(&asoc->wait, &wait,
7112 TASK_INTERRUPTIBLE);
7115 if (sk->sk_shutdown & RCV_SHUTDOWN)
7117 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7120 if (signal_pending(current))
7121 goto do_interrupted;
7123 if (sctp_state(asoc, ESTABLISHED))
7126 /* Let another process have a go. Since we are going
7130 current_timeo = schedule_timeout(current_timeo);
7133 *timeo_p = current_timeo;
7137 finish_wait(&asoc->wait, &wait);
7139 /* Release the association's refcnt. */
7140 sctp_association_put(asoc);
7145 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7148 err = -ECONNREFUSED;
7152 err = sock_intr_errno(*timeo_p);
7160 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7162 struct sctp_endpoint *ep;
7166 ep = sctp_sk(sk)->ep;
7170 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
7171 TASK_INTERRUPTIBLE);
7173 if (list_empty(&ep->asocs)) {
7175 timeo = schedule_timeout(timeo);
7180 if (!sctp_sstate(sk, LISTENING))
7184 if (!list_empty(&ep->asocs))
7187 err = sock_intr_errno(timeo);
7188 if (signal_pending(current))
7196 finish_wait(sk_sleep(sk), &wait);
7201 static void sctp_wait_for_close(struct sock *sk, long timeout)
7206 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7207 if (list_empty(&sctp_sk(sk)->ep->asocs))
7210 timeout = schedule_timeout(timeout);
7212 } while (!signal_pending(current) && timeout);
7214 finish_wait(sk_sleep(sk), &wait);
7217 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7219 struct sk_buff *frag;
7224 /* Don't forget the fragments. */
7225 skb_walk_frags(skb, frag)
7226 sctp_skb_set_owner_r_frag(frag, sk);
7229 sctp_skb_set_owner_r(skb, sk);
7232 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7233 struct sctp_association *asoc)
7235 struct inet_sock *inet = inet_sk(sk);
7236 struct inet_sock *newinet;
7238 newsk->sk_type = sk->sk_type;
7239 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7240 newsk->sk_flags = sk->sk_flags;
7241 newsk->sk_tsflags = sk->sk_tsflags;
7242 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7243 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7244 newsk->sk_reuse = sk->sk_reuse;
7246 newsk->sk_shutdown = sk->sk_shutdown;
7247 newsk->sk_destruct = sctp_destruct_sock;
7248 newsk->sk_family = sk->sk_family;
7249 newsk->sk_protocol = IPPROTO_SCTP;
7250 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7251 newsk->sk_sndbuf = sk->sk_sndbuf;
7252 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7253 newsk->sk_lingertime = sk->sk_lingertime;
7254 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7255 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7257 newinet = inet_sk(newsk);
7259 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7260 * getsockname() and getpeername()
7262 newinet->inet_sport = inet->inet_sport;
7263 newinet->inet_saddr = inet->inet_saddr;
7264 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7265 newinet->inet_dport = htons(asoc->peer.port);
7266 newinet->pmtudisc = inet->pmtudisc;
7267 newinet->inet_id = prandom_u32();
7269 newinet->uc_ttl = inet->uc_ttl;
7270 newinet->mc_loop = 1;
7271 newinet->mc_ttl = 1;
7272 newinet->mc_index = 0;
7273 newinet->mc_list = NULL;
7275 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
7276 net_enable_timestamp();
7278 security_sk_clone(sk, newsk);
7281 static inline void sctp_copy_descendant(struct sock *sk_to,
7282 const struct sock *sk_from)
7284 int ancestor_size = sizeof(struct inet_sock) +
7285 sizeof(struct sctp_sock) -
7286 offsetof(struct sctp_sock, auto_asconf_list);
7288 if (sk_from->sk_family == PF_INET6)
7289 ancestor_size += sizeof(struct ipv6_pinfo);
7291 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7294 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7295 * and its messages to the newsk.
7297 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7298 struct sctp_association *assoc,
7299 sctp_socket_type_t type)
7301 struct sctp_sock *oldsp = sctp_sk(oldsk);
7302 struct sctp_sock *newsp = sctp_sk(newsk);
7303 struct sctp_bind_bucket *pp; /* hash list port iterator */
7304 struct sctp_endpoint *newep = newsp->ep;
7305 struct sk_buff *skb, *tmp;
7306 struct sctp_ulpevent *event;
7307 struct sctp_bind_hashbucket *head;
7309 /* Migrate socket buffer sizes and all the socket level options to the
7312 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7313 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7314 /* Brute force copy old sctp opt. */
7315 sctp_copy_descendant(newsk, oldsk);
7317 /* Restore the ep value that was overwritten with the above structure
7323 /* Hook this new socket in to the bind_hash list. */
7324 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7325 inet_sk(oldsk)->inet_num)];
7327 spin_lock(&head->lock);
7328 pp = sctp_sk(oldsk)->bind_hash;
7329 sk_add_bind_node(newsk, &pp->owner);
7330 sctp_sk(newsk)->bind_hash = pp;
7331 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7332 spin_unlock(&head->lock);
7335 /* Copy the bind_addr list from the original endpoint to the new
7336 * endpoint so that we can handle restarts properly
7338 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7339 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7341 sctp_auto_asconf_init(newsp);
7343 /* Move any messages in the old socket's receive queue that are for the
7344 * peeled off association to the new socket's receive queue.
7346 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7347 event = sctp_skb2event(skb);
7348 if (event->asoc == assoc) {
7349 __skb_unlink(skb, &oldsk->sk_receive_queue);
7350 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7351 sctp_skb_set_owner_r_frag(skb, newsk);
7355 /* Clean up any messages pending delivery due to partial
7356 * delivery. Three cases:
7357 * 1) No partial deliver; no work.
7358 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7359 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7361 skb_queue_head_init(&newsp->pd_lobby);
7362 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7364 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7365 struct sk_buff_head *queue;
7367 /* Decide which queue to move pd_lobby skbs to. */
7368 if (assoc->ulpq.pd_mode) {
7369 queue = &newsp->pd_lobby;
7371 queue = &newsk->sk_receive_queue;
7373 /* Walk through the pd_lobby, looking for skbs that
7374 * need moved to the new socket.
7376 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7377 event = sctp_skb2event(skb);
7378 if (event->asoc == assoc) {
7379 __skb_unlink(skb, &oldsp->pd_lobby);
7380 __skb_queue_tail(queue, skb);
7381 sctp_skb_set_owner_r_frag(skb, newsk);
7385 /* Clear up any skbs waiting for the partial
7386 * delivery to finish.
7388 if (assoc->ulpq.pd_mode)
7389 sctp_clear_pd(oldsk, NULL);
7393 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7394 sctp_skb_set_owner_r_frag(skb, newsk);
7396 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7397 sctp_skb_set_owner_r_frag(skb, newsk);
7399 /* Set the type of socket to indicate that it is peeled off from the
7400 * original UDP-style socket or created with the accept() call on a
7401 * TCP-style socket..
7405 /* Mark the new socket "in-use" by the user so that any packets
7406 * that may arrive on the association after we've moved it are
7407 * queued to the backlog. This prevents a potential race between
7408 * backlog processing on the old socket and new-packet processing
7409 * on the new socket.
7411 * The caller has just allocated newsk so we can guarantee that other
7412 * paths won't try to lock it and then oldsk.
7414 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7415 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
7416 sctp_assoc_migrate(assoc, newsk);
7417 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
7419 /* If the association on the newsk is already closed before accept()
7420 * is called, set RCV_SHUTDOWN flag.
7422 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7423 newsk->sk_shutdown |= RCV_SHUTDOWN;
7425 newsk->sk_state = SCTP_SS_ESTABLISHED;
7426 release_sock(newsk);
7430 /* This proto struct describes the ULP interface for SCTP. */
7431 struct proto sctp_prot = {
7433 .owner = THIS_MODULE,
7434 .close = sctp_close,
7435 .disconnect = sctp_disconnect,
7436 .accept = sctp_accept,
7437 .ioctl = sctp_ioctl,
7438 .init = sctp_init_sock,
7439 .destroy = sctp_destroy_sock,
7440 .shutdown = sctp_shutdown,
7441 .setsockopt = sctp_setsockopt,
7442 .getsockopt = sctp_getsockopt,
7443 .sendmsg = sctp_sendmsg,
7444 .recvmsg = sctp_recvmsg,
7446 .backlog_rcv = sctp_backlog_rcv,
7448 .unhash = sctp_unhash,
7449 .no_autobind = true,
7450 .obj_size = sizeof(struct sctp_sock),
7451 .sysctl_mem = sysctl_sctp_mem,
7452 .sysctl_rmem = sysctl_sctp_rmem,
7453 .sysctl_wmem = sysctl_sctp_wmem,
7454 .memory_pressure = &sctp_memory_pressure,
7455 .enter_memory_pressure = sctp_enter_memory_pressure,
7456 .memory_allocated = &sctp_memory_allocated,
7457 .sockets_allocated = &sctp_sockets_allocated,
7460 #if IS_ENABLED(CONFIG_IPV6)
7462 #include <net/transp_v6.h>
7463 static void sctp_v6_destroy_sock(struct sock *sk)
7465 sctp_destroy_sock(sk);
7466 inet6_destroy_sock(sk);
7469 struct proto sctpv6_prot = {
7471 .owner = THIS_MODULE,
7472 .close = sctp_close,
7473 .disconnect = sctp_disconnect,
7474 .accept = sctp_accept,
7475 .ioctl = sctp_ioctl,
7476 .init = sctp_init_sock,
7477 .destroy = sctp_v6_destroy_sock,
7478 .shutdown = sctp_shutdown,
7479 .setsockopt = sctp_setsockopt,
7480 .getsockopt = sctp_getsockopt,
7481 .sendmsg = sctp_sendmsg,
7482 .recvmsg = sctp_recvmsg,
7484 .backlog_rcv = sctp_backlog_rcv,
7486 .unhash = sctp_unhash,
7487 .no_autobind = true,
7488 .obj_size = sizeof(struct sctp6_sock),
7489 .sysctl_mem = sysctl_sctp_mem,
7490 .sysctl_rmem = sysctl_sctp_rmem,
7491 .sysctl_wmem = sysctl_sctp_wmem,
7492 .memory_pressure = &sctp_memory_pressure,
7493 .enter_memory_pressure = sctp_enter_memory_pressure,
7494 .memory_allocated = &sctp_memory_allocated,
7495 .sockets_allocated = &sctp_sockets_allocated,
7497 #endif /* IS_ENABLED(CONFIG_IPV6) */