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 *, 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 extern struct kmem_cache *sctp_bucket_cachep;
106 extern long sysctl_sctp_mem[3];
107 extern int sysctl_sctp_rmem[3];
108 extern int sysctl_sctp_wmem[3];
110 static int sctp_memory_pressure;
111 static atomic_long_t sctp_memory_allocated;
112 struct percpu_counter sctp_sockets_allocated;
114 static void sctp_enter_memory_pressure(struct sock *sk)
116 sctp_memory_pressure = 1;
120 /* Get the sndbuf space available at the time on the association. */
121 static inline int sctp_wspace(struct sctp_association *asoc)
125 if (asoc->ep->sndbuf_policy)
126 amt = asoc->sndbuf_used;
128 amt = sk_wmem_alloc_get(asoc->base.sk);
130 if (amt >= asoc->base.sk->sk_sndbuf) {
131 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
134 amt = sk_stream_wspace(asoc->base.sk);
139 amt = asoc->base.sk->sk_sndbuf - amt;
144 /* Increment the used sndbuf space count of the corresponding association by
145 * the size of the outgoing data chunk.
146 * Also, set the skb destructor for sndbuf accounting later.
148 * Since it is always 1-1 between chunk and skb, and also a new skb is always
149 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
150 * destructor in the data chunk skb for the purpose of the sndbuf space
153 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
155 struct sctp_association *asoc = chunk->asoc;
156 struct sock *sk = asoc->base.sk;
158 /* The sndbuf space is tracked per association. */
159 sctp_association_hold(asoc);
161 skb_set_owner_w(chunk->skb, sk);
163 chunk->skb->destructor = sctp_wfree;
164 /* Save the chunk pointer in skb for sctp_wfree to use later. */
165 skb_shinfo(chunk->skb)->destructor_arg = chunk;
167 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
168 sizeof(struct sk_buff) +
169 sizeof(struct sctp_chunk);
171 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
172 sk->sk_wmem_queued += chunk->skb->truesize;
173 sk_mem_charge(sk, chunk->skb->truesize);
176 /* Verify that this is a valid address. */
177 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
182 /* Verify basic sockaddr. */
183 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
187 /* Is this a valid SCTP address? */
188 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
191 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
197 /* Look up the association by its id. If this is not a UDP-style
198 * socket, the ID field is always ignored.
200 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
202 struct sctp_association *asoc = NULL;
204 /* If this is not a UDP-style socket, assoc id should be ignored. */
205 if (!sctp_style(sk, UDP)) {
206 /* Return NULL if the socket state is not ESTABLISHED. It
207 * could be a TCP-style listening socket or a socket which
208 * hasn't yet called connect() to establish an association.
210 if (!sctp_sstate(sk, ESTABLISHED))
213 /* Get the first and the only association from the list. */
214 if (!list_empty(&sctp_sk(sk)->ep->asocs))
215 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
216 struct sctp_association, asocs);
220 /* Otherwise this is a UDP-style socket. */
221 if (!id || (id == (sctp_assoc_t)-1))
224 spin_lock_bh(&sctp_assocs_id_lock);
225 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
226 spin_unlock_bh(&sctp_assocs_id_lock);
228 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
234 /* Look up the transport from an address and an assoc id. If both address and
235 * id are specified, the associations matching the address and the id should be
238 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
239 struct sockaddr_storage *addr,
242 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
243 struct sctp_transport *transport;
244 union sctp_addr *laddr = (union sctp_addr *)addr;
246 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
253 id_asoc = sctp_id2assoc(sk, id);
254 if (id_asoc && (id_asoc != addr_asoc))
257 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
258 (union sctp_addr *)addr);
263 /* API 3.1.2 bind() - UDP Style Syntax
264 * The syntax of bind() is,
266 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
268 * sd - the socket descriptor returned by socket().
269 * addr - the address structure (struct sockaddr_in or struct
270 * sockaddr_in6 [RFC 2553]),
271 * addr_len - the size of the address structure.
273 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
279 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
282 /* Disallow binding twice. */
283 if (!sctp_sk(sk)->ep->base.bind_addr.port)
284 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
294 static long sctp_get_port_local(struct sock *, union sctp_addr *);
296 /* Verify this is a valid sockaddr. */
297 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
298 union sctp_addr *addr, int len)
302 /* Check minimum size. */
303 if (len < sizeof (struct sockaddr))
306 /* V4 mapped address are really of AF_INET family */
307 if (addr->sa.sa_family == AF_INET6 &&
308 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
309 if (!opt->pf->af_supported(AF_INET, opt))
312 /* Does this PF support this AF? */
313 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
317 /* If we get this far, af is valid. */
318 af = sctp_get_af_specific(addr->sa.sa_family);
320 if (len < af->sockaddr_len)
326 /* Bind a local address either to an endpoint or to an association. */
327 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
329 struct net *net = sock_net(sk);
330 struct sctp_sock *sp = sctp_sk(sk);
331 struct sctp_endpoint *ep = sp->ep;
332 struct sctp_bind_addr *bp = &ep->base.bind_addr;
337 /* Common sockaddr verification. */
338 af = sctp_sockaddr_af(sp, addr, len);
340 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
341 __func__, sk, addr, len);
345 snum = ntohs(addr->v4.sin_port);
347 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
348 __func__, sk, &addr->sa, bp->port, snum, len);
350 /* PF specific bind() address verification. */
351 if (!sp->pf->bind_verify(sp, addr))
352 return -EADDRNOTAVAIL;
354 /* We must either be unbound, or bind to the same port.
355 * It's OK to allow 0 ports if we are already bound.
356 * We'll just inhert an already bound port in this case
361 else if (snum != bp->port) {
362 pr_debug("%s: new port %d doesn't match existing port "
363 "%d\n", __func__, snum, bp->port);
368 if (snum && snum < PROT_SOCK &&
369 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
372 /* See if the address matches any of the addresses we may have
373 * already bound before checking against other endpoints.
375 if (sctp_bind_addr_match(bp, addr, sp))
378 /* Make sure we are allowed to bind here.
379 * The function sctp_get_port_local() does duplicate address
382 addr->v4.sin_port = htons(snum);
383 if ((ret = sctp_get_port_local(sk, addr))) {
387 /* Refresh ephemeral port. */
389 bp->port = inet_sk(sk)->inet_num;
391 /* Add the address to the bind address list.
392 * Use GFP_ATOMIC since BHs will be disabled.
394 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
396 /* Copy back into socket for getsockname() use. */
398 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
399 sp->pf->to_sk_saddr(addr, sk);
405 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
407 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
408 * at any one time. If a sender, after sending an ASCONF chunk, decides
409 * it needs to transfer another ASCONF Chunk, it MUST wait until the
410 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
411 * subsequent ASCONF. Note this restriction binds each side, so at any
412 * time two ASCONF may be in-transit on any given association (one sent
413 * from each endpoint).
415 static int sctp_send_asconf(struct sctp_association *asoc,
416 struct sctp_chunk *chunk)
418 struct net *net = sock_net(asoc->base.sk);
421 /* If there is an outstanding ASCONF chunk, queue it for later
424 if (asoc->addip_last_asconf) {
425 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
429 /* Hold the chunk until an ASCONF_ACK is received. */
430 sctp_chunk_hold(chunk);
431 retval = sctp_primitive_ASCONF(net, asoc, chunk);
433 sctp_chunk_free(chunk);
435 asoc->addip_last_asconf = chunk;
441 /* Add a list of addresses as bind addresses to local endpoint or
444 * Basically run through each address specified in the addrs/addrcnt
445 * array/length pair, determine if it is IPv6 or IPv4 and call
446 * sctp_do_bind() on it.
448 * If any of them fails, then the operation will be reversed and the
449 * ones that were added will be removed.
451 * Only sctp_setsockopt_bindx() is supposed to call this function.
453 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
458 struct sockaddr *sa_addr;
461 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
465 for (cnt = 0; cnt < addrcnt; cnt++) {
466 /* The list may contain either IPv4 or IPv6 address;
467 * determine the address length for walking thru the list.
470 af = sctp_get_af_specific(sa_addr->sa_family);
476 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
479 addr_buf += af->sockaddr_len;
483 /* Failed. Cleanup the ones that have been added */
485 sctp_bindx_rem(sk, addrs, cnt);
493 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
494 * associations that are part of the endpoint indicating that a list of local
495 * addresses are added to the endpoint.
497 * If any of the addresses is already in the bind address list of the
498 * association, we do not send the chunk for that association. But it will not
499 * affect other associations.
501 * Only sctp_setsockopt_bindx() is supposed to call this function.
503 static int sctp_send_asconf_add_ip(struct sock *sk,
504 struct sockaddr *addrs,
507 struct net *net = sock_net(sk);
508 struct sctp_sock *sp;
509 struct sctp_endpoint *ep;
510 struct sctp_association *asoc;
511 struct sctp_bind_addr *bp;
512 struct sctp_chunk *chunk;
513 struct sctp_sockaddr_entry *laddr;
514 union sctp_addr *addr;
515 union sctp_addr saveaddr;
522 if (!net->sctp.addip_enable)
528 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
529 __func__, sk, addrs, addrcnt);
531 list_for_each_entry(asoc, &ep->asocs, asocs) {
532 if (!asoc->peer.asconf_capable)
535 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
538 if (!sctp_state(asoc, ESTABLISHED))
541 /* Check if any address in the packed array of addresses is
542 * in the bind address list of the association. If so,
543 * do not send the asconf chunk to its peer, but continue with
544 * other associations.
547 for (i = 0; i < addrcnt; i++) {
549 af = sctp_get_af_specific(addr->v4.sin_family);
555 if (sctp_assoc_lookup_laddr(asoc, addr))
558 addr_buf += af->sockaddr_len;
563 /* Use the first valid address in bind addr list of
564 * association as Address Parameter of ASCONF CHUNK.
566 bp = &asoc->base.bind_addr;
567 p = bp->address_list.next;
568 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
569 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
570 addrcnt, SCTP_PARAM_ADD_IP);
576 /* Add the new addresses to the bind address list with
577 * use_as_src set to 0.
580 for (i = 0; i < addrcnt; i++) {
582 af = sctp_get_af_specific(addr->v4.sin_family);
583 memcpy(&saveaddr, addr, af->sockaddr_len);
584 retval = sctp_add_bind_addr(bp, &saveaddr,
585 SCTP_ADDR_NEW, GFP_ATOMIC);
586 addr_buf += af->sockaddr_len;
588 if (asoc->src_out_of_asoc_ok) {
589 struct sctp_transport *trans;
591 list_for_each_entry(trans,
592 &asoc->peer.transport_addr_list, transports) {
593 /* Clear the source and route cache */
594 dst_release(trans->dst);
595 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
596 2*asoc->pathmtu, 4380));
597 trans->ssthresh = asoc->peer.i.a_rwnd;
598 trans->rto = asoc->rto_initial;
599 sctp_max_rto(asoc, trans);
600 trans->rtt = trans->srtt = trans->rttvar = 0;
601 sctp_transport_route(trans, NULL,
602 sctp_sk(asoc->base.sk));
605 retval = sctp_send_asconf(asoc, chunk);
612 /* Remove a list of addresses from bind addresses list. Do not remove the
615 * Basically run through each address specified in the addrs/addrcnt
616 * array/length pair, determine if it is IPv6 or IPv4 and call
617 * sctp_del_bind() on it.
619 * If any of them fails, then the operation will be reversed and the
620 * ones that were removed will be added back.
622 * At least one address has to be left; if only one address is
623 * available, the operation will return -EBUSY.
625 * Only sctp_setsockopt_bindx() is supposed to call this function.
627 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
629 struct sctp_sock *sp = sctp_sk(sk);
630 struct sctp_endpoint *ep = sp->ep;
632 struct sctp_bind_addr *bp = &ep->base.bind_addr;
635 union sctp_addr *sa_addr;
638 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
639 __func__, sk, addrs, addrcnt);
642 for (cnt = 0; cnt < addrcnt; cnt++) {
643 /* If the bind address list is empty or if there is only one
644 * bind address, there is nothing more to be removed (we need
645 * at least one address here).
647 if (list_empty(&bp->address_list) ||
648 (sctp_list_single_entry(&bp->address_list))) {
654 af = sctp_get_af_specific(sa_addr->sa.sa_family);
660 if (!af->addr_valid(sa_addr, sp, NULL)) {
661 retval = -EADDRNOTAVAIL;
665 if (sa_addr->v4.sin_port &&
666 sa_addr->v4.sin_port != htons(bp->port)) {
671 if (!sa_addr->v4.sin_port)
672 sa_addr->v4.sin_port = htons(bp->port);
674 /* FIXME - There is probably a need to check if sk->sk_saddr and
675 * sk->sk_rcv_addr are currently set to one of the addresses to
676 * be removed. This is something which needs to be looked into
677 * when we are fixing the outstanding issues with multi-homing
678 * socket routing and failover schemes. Refer to comments in
679 * sctp_do_bind(). -daisy
681 retval = sctp_del_bind_addr(bp, sa_addr);
683 addr_buf += af->sockaddr_len;
686 /* Failed. Add the ones that has been removed back */
688 sctp_bindx_add(sk, addrs, cnt);
696 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
697 * the associations that are part of the endpoint indicating that a list of
698 * local addresses are removed from the endpoint.
700 * If any of the addresses is already in the bind address list of the
701 * association, we do not send the chunk for that association. But it will not
702 * affect other associations.
704 * Only sctp_setsockopt_bindx() is supposed to call this function.
706 static int sctp_send_asconf_del_ip(struct sock *sk,
707 struct sockaddr *addrs,
710 struct net *net = sock_net(sk);
711 struct sctp_sock *sp;
712 struct sctp_endpoint *ep;
713 struct sctp_association *asoc;
714 struct sctp_transport *transport;
715 struct sctp_bind_addr *bp;
716 struct sctp_chunk *chunk;
717 union sctp_addr *laddr;
720 struct sctp_sockaddr_entry *saddr;
726 if (!net->sctp.addip_enable)
732 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
733 __func__, sk, addrs, addrcnt);
735 list_for_each_entry(asoc, &ep->asocs, asocs) {
737 if (!asoc->peer.asconf_capable)
740 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
743 if (!sctp_state(asoc, ESTABLISHED))
746 /* Check if any address in the packed array of addresses is
747 * not present in the bind address list of the association.
748 * If so, do not send the asconf chunk to its peer, but
749 * continue with other associations.
752 for (i = 0; i < addrcnt; i++) {
754 af = sctp_get_af_specific(laddr->v4.sin_family);
760 if (!sctp_assoc_lookup_laddr(asoc, laddr))
763 addr_buf += af->sockaddr_len;
768 /* Find one address in the association's bind address list
769 * that is not in the packed array of addresses. This is to
770 * make sure that we do not delete all the addresses in the
773 bp = &asoc->base.bind_addr;
774 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
776 if ((laddr == NULL) && (addrcnt == 1)) {
777 if (asoc->asconf_addr_del_pending)
779 asoc->asconf_addr_del_pending =
780 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
781 if (asoc->asconf_addr_del_pending == NULL) {
785 asoc->asconf_addr_del_pending->sa.sa_family =
787 asoc->asconf_addr_del_pending->v4.sin_port =
789 if (addrs->sa_family == AF_INET) {
790 struct sockaddr_in *sin;
792 sin = (struct sockaddr_in *)addrs;
793 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
794 } else if (addrs->sa_family == AF_INET6) {
795 struct sockaddr_in6 *sin6;
797 sin6 = (struct sockaddr_in6 *)addrs;
798 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
801 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
802 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
803 asoc->asconf_addr_del_pending);
805 asoc->src_out_of_asoc_ok = 1;
813 /* We do not need RCU protection throughout this loop
814 * because this is done under a socket lock from the
817 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
825 /* Reset use_as_src flag for the addresses in the bind address
826 * list that are to be deleted.
829 for (i = 0; i < addrcnt; i++) {
831 af = sctp_get_af_specific(laddr->v4.sin_family);
832 list_for_each_entry(saddr, &bp->address_list, list) {
833 if (sctp_cmp_addr_exact(&saddr->a, laddr))
834 saddr->state = SCTP_ADDR_DEL;
836 addr_buf += af->sockaddr_len;
839 /* Update the route and saddr entries for all the transports
840 * as some of the addresses in the bind address list are
841 * about to be deleted and cannot be used as source addresses.
843 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
845 dst_release(transport->dst);
846 sctp_transport_route(transport, NULL,
847 sctp_sk(asoc->base.sk));
851 /* We don't need to transmit ASCONF */
853 retval = sctp_send_asconf(asoc, chunk);
859 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
860 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
862 struct sock *sk = sctp_opt2sk(sp);
863 union sctp_addr *addr;
866 /* It is safe to write port space in caller. */
868 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
869 af = sctp_get_af_specific(addr->sa.sa_family);
872 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
875 if (addrw->state == SCTP_ADDR_NEW)
876 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
878 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
881 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
884 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
887 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
888 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
891 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
892 * Section 3.1.2 for this usage.
894 * addrs is a pointer to an array of one or more socket addresses. Each
895 * address is contained in its appropriate structure (i.e. struct
896 * sockaddr_in or struct sockaddr_in6) the family of the address type
897 * must be used to distinguish the address length (note that this
898 * representation is termed a "packed array" of addresses). The caller
899 * specifies the number of addresses in the array with addrcnt.
901 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
902 * -1, and sets errno to the appropriate error code.
904 * For SCTP, the port given in each socket address must be the same, or
905 * sctp_bindx() will fail, setting errno to EINVAL.
907 * The flags parameter is formed from the bitwise OR of zero or more of
908 * the following currently defined flags:
910 * SCTP_BINDX_ADD_ADDR
912 * SCTP_BINDX_REM_ADDR
914 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
915 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
916 * addresses from the association. The two flags are mutually exclusive;
917 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
918 * not remove all addresses from an association; sctp_bindx() will
919 * reject such an attempt with EINVAL.
921 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
922 * additional addresses with an endpoint after calling bind(). Or use
923 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
924 * socket is associated with so that no new association accepted will be
925 * associated with those addresses. If the endpoint supports dynamic
926 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
927 * endpoint to send the appropriate message to the peer to change the
928 * peers address lists.
930 * Adding and removing addresses from a connected association is
931 * optional functionality. Implementations that do not support this
932 * functionality should return EOPNOTSUPP.
934 * Basically do nothing but copying the addresses from user to kernel
935 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
936 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
939 * We don't use copy_from_user() for optimization: we first do the
940 * sanity checks (buffer size -fast- and access check-healthy
941 * pointer); if all of those succeed, then we can alloc the memory
942 * (expensive operation) needed to copy the data to kernel. Then we do
943 * the copying without checking the user space area
944 * (__copy_from_user()).
946 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
949 * sk The sk of the socket
950 * addrs The pointer to the addresses in user land
951 * addrssize Size of the addrs buffer
952 * op Operation to perform (add or remove, see the flags of
955 * Returns 0 if ok, <0 errno code on error.
957 static int sctp_setsockopt_bindx(struct sock *sk,
958 struct sockaddr __user *addrs,
959 int addrs_size, int op)
961 struct sockaddr *kaddrs;
965 struct sockaddr *sa_addr;
969 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
970 __func__, sk, addrs, addrs_size, op);
972 if (unlikely(addrs_size <= 0))
975 /* Check the user passed a healthy pointer. */
976 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
979 /* Alloc space for the address array in kernel memory. */
980 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
981 if (unlikely(!kaddrs))
984 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
989 /* Walk through the addrs buffer and count the number of addresses. */
991 while (walk_size < addrs_size) {
992 if (walk_size + sizeof(sa_family_t) > addrs_size) {
998 af = sctp_get_af_specific(sa_addr->sa_family);
1000 /* If the address family is not supported or if this address
1001 * causes the address buffer to overflow return EINVAL.
1003 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1008 addr_buf += af->sockaddr_len;
1009 walk_size += af->sockaddr_len;
1014 case SCTP_BINDX_ADD_ADDR:
1015 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1018 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1021 case SCTP_BINDX_REM_ADDR:
1022 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1025 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1039 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1041 * Common routine for handling connect() and sctp_connectx().
1042 * Connect will come in with just a single address.
1044 static int __sctp_connect(struct sock *sk,
1045 struct sockaddr *kaddrs,
1047 sctp_assoc_t *assoc_id)
1049 struct net *net = sock_net(sk);
1050 struct sctp_sock *sp;
1051 struct sctp_endpoint *ep;
1052 struct sctp_association *asoc = NULL;
1053 struct sctp_association *asoc2;
1054 struct sctp_transport *transport;
1061 union sctp_addr *sa_addr = NULL;
1063 unsigned short port;
1064 unsigned int f_flags = 0;
1069 /* connect() cannot be done on a socket that is already in ESTABLISHED
1070 * state - UDP-style peeled off socket or a TCP-style socket that
1071 * is already connected.
1072 * It cannot be done even on a TCP-style listening socket.
1074 if (sctp_sstate(sk, ESTABLISHED) ||
1075 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1080 /* Walk through the addrs buffer and count the number of addresses. */
1082 while (walk_size < addrs_size) {
1085 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1091 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1093 /* If the address family is not supported or if this address
1094 * causes the address buffer to overflow return EINVAL.
1096 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1101 port = ntohs(sa_addr->v4.sin_port);
1103 /* Save current address so we can work with it */
1104 memcpy(&to, sa_addr, af->sockaddr_len);
1106 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1110 /* Make sure the destination port is correctly set
1113 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1118 /* Check if there already is a matching association on the
1119 * endpoint (other than the one created here).
1121 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1122 if (asoc2 && asoc2 != asoc) {
1123 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1130 /* If we could not find a matching association on the endpoint,
1131 * make sure that there is no peeled-off association matching
1132 * the peer address even on another socket.
1134 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1135 err = -EADDRNOTAVAIL;
1140 /* If a bind() or sctp_bindx() is not called prior to
1141 * an sctp_connectx() call, the system picks an
1142 * ephemeral port and will choose an address set
1143 * equivalent to binding with a wildcard address.
1145 if (!ep->base.bind_addr.port) {
1146 if (sctp_autobind(sk)) {
1152 * If an unprivileged user inherits a 1-many
1153 * style socket with open associations on a
1154 * privileged port, it MAY be permitted to
1155 * accept new associations, but it SHOULD NOT
1156 * be permitted to open new associations.
1158 if (ep->base.bind_addr.port < PROT_SOCK &&
1159 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1165 scope = sctp_scope(&to);
1166 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1172 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1180 /* Prime the peer's transport structures. */
1181 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1189 addr_buf += af->sockaddr_len;
1190 walk_size += af->sockaddr_len;
1193 /* In case the user of sctp_connectx() wants an association
1194 * id back, assign one now.
1197 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1202 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1207 /* Initialize sk's dport and daddr for getpeername() */
1208 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1209 sp->pf->to_sk_daddr(sa_addr, sk);
1212 /* in-kernel sockets don't generally have a file allocated to them
1213 * if all they do is call sock_create_kern().
1215 if (sk->sk_socket->file)
1216 f_flags = sk->sk_socket->file->f_flags;
1218 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1220 err = sctp_wait_for_connect(asoc, &timeo);
1221 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1222 *assoc_id = asoc->assoc_id;
1224 /* Don't free association on exit. */
1228 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1229 __func__, asoc, kaddrs, err);
1232 /* sctp_primitive_ASSOCIATE may have added this association
1233 * To the hash table, try to unhash it, just in case, its a noop
1234 * if it wasn't hashed so we're safe
1236 sctp_unhash_established(asoc);
1237 sctp_association_free(asoc);
1242 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1245 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1246 * sctp_assoc_t *asoc);
1248 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1249 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1250 * or IPv6 addresses.
1252 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1253 * Section 3.1.2 for this usage.
1255 * addrs is a pointer to an array of one or more socket addresses. Each
1256 * address is contained in its appropriate structure (i.e. struct
1257 * sockaddr_in or struct sockaddr_in6) the family of the address type
1258 * must be used to distengish the address length (note that this
1259 * representation is termed a "packed array" of addresses). The caller
1260 * specifies the number of addresses in the array with addrcnt.
1262 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1263 * the association id of the new association. On failure, sctp_connectx()
1264 * returns -1, and sets errno to the appropriate error code. The assoc_id
1265 * is not touched by the kernel.
1267 * For SCTP, the port given in each socket address must be the same, or
1268 * sctp_connectx() will fail, setting errno to EINVAL.
1270 * An application can use sctp_connectx to initiate an association with
1271 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1272 * allows a caller to specify multiple addresses at which a peer can be
1273 * reached. The way the SCTP stack uses the list of addresses to set up
1274 * the association is implementation dependent. This function only
1275 * specifies that the stack will try to make use of all the addresses in
1276 * the list when needed.
1278 * Note that the list of addresses passed in is only used for setting up
1279 * the association. It does not necessarily equal the set of addresses
1280 * the peer uses for the resulting association. If the caller wants to
1281 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1282 * retrieve them after the association has been set up.
1284 * Basically do nothing but copying the addresses from user to kernel
1285 * land and invoking either sctp_connectx(). This is used for tunneling
1286 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1288 * We don't use copy_from_user() for optimization: we first do the
1289 * sanity checks (buffer size -fast- and access check-healthy
1290 * pointer); if all of those succeed, then we can alloc the memory
1291 * (expensive operation) needed to copy the data to kernel. Then we do
1292 * the copying without checking the user space area
1293 * (__copy_from_user()).
1295 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1298 * sk The sk of the socket
1299 * addrs The pointer to the addresses in user land
1300 * addrssize Size of the addrs buffer
1302 * Returns >=0 if ok, <0 errno code on error.
1304 static int __sctp_setsockopt_connectx(struct sock *sk,
1305 struct sockaddr __user *addrs,
1307 sctp_assoc_t *assoc_id)
1310 struct sockaddr *kaddrs;
1312 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1313 __func__, sk, addrs, addrs_size);
1315 if (unlikely(addrs_size <= 0))
1318 /* Check the user passed a healthy pointer. */
1319 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1322 /* Alloc space for the address array in kernel memory. */
1323 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1324 if (unlikely(!kaddrs))
1327 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1330 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1339 * This is an older interface. It's kept for backward compatibility
1340 * to the option that doesn't provide association id.
1342 static int sctp_setsockopt_connectx_old(struct sock *sk,
1343 struct sockaddr __user *addrs,
1346 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1350 * New interface for the API. The since the API is done with a socket
1351 * option, to make it simple we feed back the association id is as a return
1352 * indication to the call. Error is always negative and association id is
1355 static int sctp_setsockopt_connectx(struct sock *sk,
1356 struct sockaddr __user *addrs,
1359 sctp_assoc_t assoc_id = 0;
1362 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1371 * New (hopefully final) interface for the API.
1372 * We use the sctp_getaddrs_old structure so that use-space library
1373 * can avoid any unnecessary allocations. The only different part
1374 * is that we store the actual length of the address buffer into the
1375 * addrs_num structure member. That way we can re-use the existing
1378 #ifdef CONFIG_COMPAT
1379 struct compat_sctp_getaddrs_old {
1380 sctp_assoc_t assoc_id;
1382 compat_uptr_t addrs; /* struct sockaddr * */
1386 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1387 char __user *optval,
1390 struct sctp_getaddrs_old param;
1391 sctp_assoc_t assoc_id = 0;
1394 #ifdef CONFIG_COMPAT
1395 if (is_compat_task()) {
1396 struct compat_sctp_getaddrs_old param32;
1398 if (len < sizeof(param32))
1400 if (copy_from_user(¶m32, optval, sizeof(param32)))
1403 param.assoc_id = param32.assoc_id;
1404 param.addr_num = param32.addr_num;
1405 param.addrs = compat_ptr(param32.addrs);
1409 if (len < sizeof(param))
1411 if (copy_from_user(¶m, optval, sizeof(param)))
1415 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1416 param.addrs, param.addr_num,
1418 if (err == 0 || err == -EINPROGRESS) {
1419 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1421 if (put_user(sizeof(assoc_id), optlen))
1428 /* API 3.1.4 close() - UDP Style Syntax
1429 * Applications use close() to perform graceful shutdown (as described in
1430 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1431 * by a UDP-style socket.
1435 * ret = close(int sd);
1437 * sd - the socket descriptor of the associations to be closed.
1439 * To gracefully shutdown a specific association represented by the
1440 * UDP-style socket, an application should use the sendmsg() call,
1441 * passing no user data, but including the appropriate flag in the
1442 * ancillary data (see Section xxxx).
1444 * If sd in the close() call is a branched-off socket representing only
1445 * one association, the shutdown is performed on that association only.
1447 * 4.1.6 close() - TCP Style Syntax
1449 * Applications use close() to gracefully close down an association.
1453 * int close(int sd);
1455 * sd - the socket descriptor of the association to be closed.
1457 * After an application calls close() on a socket descriptor, no further
1458 * socket operations will succeed on that descriptor.
1460 * API 7.1.4 SO_LINGER
1462 * An application using the TCP-style socket can use this option to
1463 * perform the SCTP ABORT primitive. The linger option structure is:
1466 * int l_onoff; // option on/off
1467 * int l_linger; // linger time
1470 * To enable the option, set l_onoff to 1. If the l_linger value is set
1471 * to 0, calling close() is the same as the ABORT primitive. If the
1472 * value is set to a negative value, the setsockopt() call will return
1473 * an error. If the value is set to a positive value linger_time, the
1474 * close() can be blocked for at most linger_time ms. If the graceful
1475 * shutdown phase does not finish during this period, close() will
1476 * return but the graceful shutdown phase continues in the system.
1478 static void sctp_close(struct sock *sk, long timeout)
1480 struct net *net = sock_net(sk);
1481 struct sctp_endpoint *ep;
1482 struct sctp_association *asoc;
1483 struct list_head *pos, *temp;
1484 unsigned int data_was_unread;
1486 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1489 sk->sk_shutdown = SHUTDOWN_MASK;
1490 sk->sk_state = SCTP_SS_CLOSING;
1492 ep = sctp_sk(sk)->ep;
1494 /* Clean up any skbs sitting on the receive queue. */
1495 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1496 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1498 /* Walk all associations on an endpoint. */
1499 list_for_each_safe(pos, temp, &ep->asocs) {
1500 asoc = list_entry(pos, struct sctp_association, asocs);
1502 if (sctp_style(sk, TCP)) {
1503 /* A closed association can still be in the list if
1504 * it belongs to a TCP-style listening socket that is
1505 * not yet accepted. If so, free it. If not, send an
1506 * ABORT or SHUTDOWN based on the linger options.
1508 if (sctp_state(asoc, CLOSED)) {
1509 sctp_unhash_established(asoc);
1510 sctp_association_free(asoc);
1515 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1516 !skb_queue_empty(&asoc->ulpq.reasm) ||
1517 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1518 struct sctp_chunk *chunk;
1520 chunk = sctp_make_abort_user(asoc, NULL, 0);
1522 sctp_primitive_ABORT(net, asoc, chunk);
1524 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1527 /* On a TCP-style socket, block for at most linger_time if set. */
1528 if (sctp_style(sk, TCP) && timeout)
1529 sctp_wait_for_close(sk, timeout);
1531 /* This will run the backlog queue. */
1534 /* Supposedly, no process has access to the socket, but
1535 * the net layers still may.
1540 /* Hold the sock, since sk_common_release() will put sock_put()
1541 * and we have just a little more cleanup.
1544 sk_common_release(sk);
1551 SCTP_DBG_OBJCNT_DEC(sock);
1554 /* Handle EPIPE error. */
1555 static int sctp_error(struct sock *sk, int flags, int err)
1558 err = sock_error(sk) ? : -EPIPE;
1559 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1560 send_sig(SIGPIPE, current, 0);
1564 /* API 3.1.3 sendmsg() - UDP Style Syntax
1566 * An application uses sendmsg() and recvmsg() calls to transmit data to
1567 * and receive data from its peer.
1569 * ssize_t sendmsg(int socket, const struct msghdr *message,
1572 * socket - the socket descriptor of the endpoint.
1573 * message - pointer to the msghdr structure which contains a single
1574 * user message and possibly some ancillary data.
1576 * See Section 5 for complete description of the data
1579 * flags - flags sent or received with the user message, see Section
1580 * 5 for complete description of the flags.
1582 * Note: This function could use a rewrite especially when explicit
1583 * connect support comes in.
1585 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1587 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1589 static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1590 struct msghdr *msg, size_t msg_len)
1592 struct net *net = sock_net(sk);
1593 struct sctp_sock *sp;
1594 struct sctp_endpoint *ep;
1595 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1596 struct sctp_transport *transport, *chunk_tp;
1597 struct sctp_chunk *chunk;
1599 struct sockaddr *msg_name = NULL;
1600 struct sctp_sndrcvinfo default_sinfo;
1601 struct sctp_sndrcvinfo *sinfo;
1602 struct sctp_initmsg *sinit;
1603 sctp_assoc_t associd = 0;
1604 sctp_cmsgs_t cmsgs = { NULL };
1606 bool fill_sinfo_ttl = false;
1607 struct sctp_datamsg *datamsg;
1608 int msg_flags = msg->msg_flags;
1609 __u16 sinfo_flags = 0;
1612 struct iov_iter from;
1614 iov_iter_init(&from, WRITE, msg->msg_iov, msg->msg_iovlen, msg_len);
1620 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1623 /* We cannot send a message over a TCP-style listening socket. */
1624 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1629 /* Parse out the SCTP CMSGs. */
1630 err = sctp_msghdr_parse(msg, &cmsgs);
1632 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1636 /* Fetch the destination address for this packet. This
1637 * address only selects the association--it is not necessarily
1638 * the address we will send to.
1639 * For a peeled-off socket, msg_name is ignored.
1641 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1642 int msg_namelen = msg->msg_namelen;
1644 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1649 if (msg_namelen > sizeof(to))
1650 msg_namelen = sizeof(to);
1651 memcpy(&to, msg->msg_name, msg_namelen);
1652 msg_name = msg->msg_name;
1656 if (cmsgs.sinfo != NULL) {
1657 memset(&default_sinfo, 0, sizeof(default_sinfo));
1658 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1659 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1660 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1661 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1662 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1664 sinfo = &default_sinfo;
1665 fill_sinfo_ttl = true;
1667 sinfo = cmsgs.srinfo;
1669 /* Did the user specify SNDINFO/SNDRCVINFO? */
1671 sinfo_flags = sinfo->sinfo_flags;
1672 associd = sinfo->sinfo_assoc_id;
1675 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1676 msg_len, sinfo_flags);
1678 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1679 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1684 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1685 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1686 * If SCTP_ABORT is set, the message length could be non zero with
1687 * the msg_iov set to the user abort reason.
1689 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1690 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1695 /* If SCTP_ADDR_OVER is set, there must be an address
1696 * specified in msg_name.
1698 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1705 pr_debug("%s: about to look up association\n", __func__);
1709 /* If a msg_name has been specified, assume this is to be used. */
1711 /* Look for a matching association on the endpoint. */
1712 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1714 /* If we could not find a matching association on the
1715 * endpoint, make sure that it is not a TCP-style
1716 * socket that already has an association or there is
1717 * no peeled-off association on another socket.
1719 if ((sctp_style(sk, TCP) &&
1720 sctp_sstate(sk, ESTABLISHED)) ||
1721 sctp_endpoint_is_peeled_off(ep, &to)) {
1722 err = -EADDRNOTAVAIL;
1727 asoc = sctp_id2assoc(sk, associd);
1735 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1737 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1738 * socket that has an association in CLOSED state. This can
1739 * happen when an accepted socket has an association that is
1742 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1747 if (sinfo_flags & SCTP_EOF) {
1748 pr_debug("%s: shutting down association:%p\n",
1751 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1755 if (sinfo_flags & SCTP_ABORT) {
1757 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1763 pr_debug("%s: aborting association:%p\n",
1766 sctp_primitive_ABORT(net, asoc, chunk);
1772 /* Do we need to create the association? */
1774 pr_debug("%s: there is no association yet\n", __func__);
1776 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1781 /* Check for invalid stream against the stream counts,
1782 * either the default or the user specified stream counts.
1785 if (!sinit || !sinit->sinit_num_ostreams) {
1786 /* Check against the defaults. */
1787 if (sinfo->sinfo_stream >=
1788 sp->initmsg.sinit_num_ostreams) {
1793 /* Check against the requested. */
1794 if (sinfo->sinfo_stream >=
1795 sinit->sinit_num_ostreams) {
1803 * API 3.1.2 bind() - UDP Style Syntax
1804 * If a bind() or sctp_bindx() is not called prior to a
1805 * sendmsg() call that initiates a new association, the
1806 * system picks an ephemeral port and will choose an address
1807 * set equivalent to binding with a wildcard address.
1809 if (!ep->base.bind_addr.port) {
1810 if (sctp_autobind(sk)) {
1816 * If an unprivileged user inherits a one-to-many
1817 * style socket with open associations on a privileged
1818 * port, it MAY be permitted to accept new associations,
1819 * but it SHOULD NOT be permitted to open new
1822 if (ep->base.bind_addr.port < PROT_SOCK &&
1823 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1829 scope = sctp_scope(&to);
1830 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1836 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1842 /* If the SCTP_INIT ancillary data is specified, set all
1843 * the association init values accordingly.
1846 if (sinit->sinit_num_ostreams) {
1847 asoc->c.sinit_num_ostreams =
1848 sinit->sinit_num_ostreams;
1850 if (sinit->sinit_max_instreams) {
1851 asoc->c.sinit_max_instreams =
1852 sinit->sinit_max_instreams;
1854 if (sinit->sinit_max_attempts) {
1855 asoc->max_init_attempts
1856 = sinit->sinit_max_attempts;
1858 if (sinit->sinit_max_init_timeo) {
1859 asoc->max_init_timeo =
1860 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1864 /* Prime the peer's transport structures. */
1865 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1872 /* ASSERT: we have a valid association at this point. */
1873 pr_debug("%s: we have a valid association\n", __func__);
1876 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1877 * one with some defaults.
1879 memset(&default_sinfo, 0, sizeof(default_sinfo));
1880 default_sinfo.sinfo_stream = asoc->default_stream;
1881 default_sinfo.sinfo_flags = asoc->default_flags;
1882 default_sinfo.sinfo_ppid = asoc->default_ppid;
1883 default_sinfo.sinfo_context = asoc->default_context;
1884 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1885 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1887 sinfo = &default_sinfo;
1888 } else if (fill_sinfo_ttl) {
1889 /* In case SNDINFO was specified, we still need to fill
1890 * it with a default ttl from the assoc here.
1892 sinfo->sinfo_timetolive = asoc->default_timetolive;
1895 /* API 7.1.7, the sndbuf size per association bounds the
1896 * maximum size of data that can be sent in a single send call.
1898 if (msg_len > sk->sk_sndbuf) {
1903 if (asoc->pmtu_pending)
1904 sctp_assoc_pending_pmtu(sk, asoc);
1906 /* If fragmentation is disabled and the message length exceeds the
1907 * association fragmentation point, return EMSGSIZE. The I-D
1908 * does not specify what this error is, but this looks like
1911 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1916 /* Check for invalid stream. */
1917 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1922 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1923 if (!sctp_wspace(asoc)) {
1924 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1929 /* If an address is passed with the sendto/sendmsg call, it is used
1930 * to override the primary destination address in the TCP model, or
1931 * when SCTP_ADDR_OVER flag is set in the UDP model.
1933 if ((sctp_style(sk, TCP) && msg_name) ||
1934 (sinfo_flags & SCTP_ADDR_OVER)) {
1935 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1943 /* Auto-connect, if we aren't connected already. */
1944 if (sctp_state(asoc, CLOSED)) {
1945 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1949 pr_debug("%s: we associated primitively\n", __func__);
1952 /* Break the message into multiple chunks of maximum size. */
1953 datamsg = sctp_datamsg_from_user(asoc, sinfo, &from);
1954 if (IS_ERR(datamsg)) {
1955 err = PTR_ERR(datamsg);
1959 /* Now send the (possibly) fragmented message. */
1960 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1961 sctp_chunk_hold(chunk);
1963 /* Do accounting for the write space. */
1964 sctp_set_owner_w(chunk);
1966 chunk->transport = chunk_tp;
1969 /* Send it to the lower layers. Note: all chunks
1970 * must either fail or succeed. The lower layer
1971 * works that way today. Keep it that way or this
1974 err = sctp_primitive_SEND(net, asoc, datamsg);
1975 /* Did the lower layer accept the chunk? */
1977 sctp_datamsg_free(datamsg);
1981 pr_debug("%s: we sent primitively\n", __func__);
1983 sctp_datamsg_put(datamsg);
1986 /* If we are already past ASSOCIATE, the lower
1987 * layers are responsible for association cleanup.
1993 sctp_unhash_established(asoc);
1994 sctp_association_free(asoc);
2000 return sctp_error(sk, msg_flags, err);
2007 err = sock_error(sk);
2017 /* This is an extended version of skb_pull() that removes the data from the
2018 * start of a skb even when data is spread across the list of skb's in the
2019 * frag_list. len specifies the total amount of data that needs to be removed.
2020 * when 'len' bytes could be removed from the skb, it returns 0.
2021 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2022 * could not be removed.
2024 static int sctp_skb_pull(struct sk_buff *skb, int len)
2026 struct sk_buff *list;
2027 int skb_len = skb_headlen(skb);
2030 if (len <= skb_len) {
2031 __skb_pull(skb, len);
2035 __skb_pull(skb, skb_len);
2037 skb_walk_frags(skb, list) {
2038 rlen = sctp_skb_pull(list, len);
2039 skb->len -= (len-rlen);
2040 skb->data_len -= (len-rlen);
2051 /* API 3.1.3 recvmsg() - UDP Style Syntax
2053 * ssize_t recvmsg(int socket, struct msghdr *message,
2056 * socket - the socket descriptor of the endpoint.
2057 * message - pointer to the msghdr structure which contains a single
2058 * user message and possibly some ancillary data.
2060 * See Section 5 for complete description of the data
2063 * flags - flags sent or received with the user message, see Section
2064 * 5 for complete description of the flags.
2066 static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2067 struct msghdr *msg, size_t len, int noblock,
2068 int flags, int *addr_len)
2070 struct sctp_ulpevent *event = NULL;
2071 struct sctp_sock *sp = sctp_sk(sk);
2072 struct sk_buff *skb;
2077 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2078 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2083 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2088 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2092 /* Get the total length of the skb including any skb's in the
2101 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2103 event = sctp_skb2event(skb);
2108 sock_recv_ts_and_drops(msg, sk, skb);
2109 if (sctp_ulpevent_is_notification(event)) {
2110 msg->msg_flags |= MSG_NOTIFICATION;
2111 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2113 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2116 /* Check if we allow SCTP_NXTINFO. */
2117 if (sp->recvnxtinfo)
2118 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2119 /* Check if we allow SCTP_RCVINFO. */
2120 if (sp->recvrcvinfo)
2121 sctp_ulpevent_read_rcvinfo(event, msg);
2122 /* Check if we allow SCTP_SNDRCVINFO. */
2123 if (sp->subscribe.sctp_data_io_event)
2124 sctp_ulpevent_read_sndrcvinfo(event, msg);
2127 /* FIXME: we should be calling IP/IPv6 layers. */
2128 if (sk->sk_protinfo.af_inet.cmsg_flags)
2129 ip_cmsg_recv(msg, skb);
2134 /* If skb's length exceeds the user's buffer, update the skb and
2135 * push it back to the receive_queue so that the next call to
2136 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2138 if (skb_len > copied) {
2139 msg->msg_flags &= ~MSG_EOR;
2140 if (flags & MSG_PEEK)
2142 sctp_skb_pull(skb, copied);
2143 skb_queue_head(&sk->sk_receive_queue, skb);
2145 /* When only partial message is copied to the user, increase
2146 * rwnd by that amount. If all the data in the skb is read,
2147 * rwnd is updated when the event is freed.
2149 if (!sctp_ulpevent_is_notification(event))
2150 sctp_assoc_rwnd_increase(event->asoc, copied);
2152 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2153 (event->msg_flags & MSG_EOR))
2154 msg->msg_flags |= MSG_EOR;
2156 msg->msg_flags &= ~MSG_EOR;
2159 if (flags & MSG_PEEK) {
2160 /* Release the skb reference acquired after peeking the skb in
2161 * sctp_skb_recv_datagram().
2165 /* Free the event which includes releasing the reference to
2166 * the owner of the skb, freeing the skb and updating the
2169 sctp_ulpevent_free(event);
2176 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2178 * This option is a on/off flag. If enabled no SCTP message
2179 * fragmentation will be performed. Instead if a message being sent
2180 * exceeds the current PMTU size, the message will NOT be sent and
2181 * instead a error will be indicated to the user.
2183 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2184 char __user *optval,
2185 unsigned int optlen)
2189 if (optlen < sizeof(int))
2192 if (get_user(val, (int __user *)optval))
2195 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2200 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2201 unsigned int optlen)
2203 struct sctp_association *asoc;
2204 struct sctp_ulpevent *event;
2206 if (optlen > sizeof(struct sctp_event_subscribe))
2208 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2211 if (sctp_sk(sk)->subscribe.sctp_data_io_event)
2212 pr_warn_ratelimited(DEPRECATED "%s (pid %d) "
2213 "Requested SCTP_SNDRCVINFO event.\n"
2214 "Use SCTP_RCVINFO through SCTP_RECVRCVINFO option instead.\n",
2215 current->comm, task_pid_nr(current));
2217 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2218 * if there is no data to be sent or retransmit, the stack will
2219 * immediately send up this notification.
2221 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2222 &sctp_sk(sk)->subscribe)) {
2223 asoc = sctp_id2assoc(sk, 0);
2225 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2226 event = sctp_ulpevent_make_sender_dry_event(asoc,
2231 sctp_ulpq_tail_event(&asoc->ulpq, event);
2238 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2240 * This socket option is applicable to the UDP-style socket only. When
2241 * set it will cause associations that are idle for more than the
2242 * specified number of seconds to automatically close. An association
2243 * being idle is defined an association that has NOT sent or received
2244 * user data. The special value of '0' indicates that no automatic
2245 * close of any associations should be performed. The option expects an
2246 * integer defining the number of seconds of idle time before an
2247 * association is closed.
2249 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2250 unsigned int optlen)
2252 struct sctp_sock *sp = sctp_sk(sk);
2253 struct net *net = sock_net(sk);
2255 /* Applicable to UDP-style socket only */
2256 if (sctp_style(sk, TCP))
2258 if (optlen != sizeof(int))
2260 if (copy_from_user(&sp->autoclose, optval, optlen))
2263 if (sp->autoclose > net->sctp.max_autoclose)
2264 sp->autoclose = net->sctp.max_autoclose;
2269 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2271 * Applications can enable or disable heartbeats for any peer address of
2272 * an association, modify an address's heartbeat interval, force a
2273 * heartbeat to be sent immediately, and adjust the address's maximum
2274 * number of retransmissions sent before an address is considered
2275 * unreachable. The following structure is used to access and modify an
2276 * address's parameters:
2278 * struct sctp_paddrparams {
2279 * sctp_assoc_t spp_assoc_id;
2280 * struct sockaddr_storage spp_address;
2281 * uint32_t spp_hbinterval;
2282 * uint16_t spp_pathmaxrxt;
2283 * uint32_t spp_pathmtu;
2284 * uint32_t spp_sackdelay;
2285 * uint32_t spp_flags;
2288 * spp_assoc_id - (one-to-many style socket) This is filled in the
2289 * application, and identifies the association for
2291 * spp_address - This specifies which address is of interest.
2292 * spp_hbinterval - This contains the value of the heartbeat interval,
2293 * in milliseconds. If a value of zero
2294 * is present in this field then no changes are to
2295 * be made to this parameter.
2296 * spp_pathmaxrxt - This contains the maximum number of
2297 * retransmissions before this address shall be
2298 * considered unreachable. If a value of zero
2299 * is present in this field then no changes are to
2300 * be made to this parameter.
2301 * spp_pathmtu - When Path MTU discovery is disabled the value
2302 * specified here will be the "fixed" path mtu.
2303 * Note that if the spp_address field is empty
2304 * then all associations on this address will
2305 * have this fixed path mtu set upon them.
2307 * spp_sackdelay - When delayed sack is enabled, this value specifies
2308 * the number of milliseconds that sacks will be delayed
2309 * for. This value will apply to all addresses of an
2310 * association if the spp_address field is empty. Note
2311 * also, that if delayed sack is enabled and this
2312 * value is set to 0, no change is made to the last
2313 * recorded delayed sack timer value.
2315 * spp_flags - These flags are used to control various features
2316 * on an association. The flag field may contain
2317 * zero or more of the following options.
2319 * SPP_HB_ENABLE - Enable heartbeats on the
2320 * specified address. Note that if the address
2321 * field is empty all addresses for the association
2322 * have heartbeats enabled upon them.
2324 * SPP_HB_DISABLE - Disable heartbeats on the
2325 * speicifed address. Note that if the address
2326 * field is empty all addresses for the association
2327 * will have their heartbeats disabled. Note also
2328 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2329 * mutually exclusive, only one of these two should
2330 * be specified. Enabling both fields will have
2331 * undetermined results.
2333 * SPP_HB_DEMAND - Request a user initiated heartbeat
2334 * to be made immediately.
2336 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2337 * heartbeat delayis to be set to the value of 0
2340 * SPP_PMTUD_ENABLE - This field will enable PMTU
2341 * discovery upon the specified address. Note that
2342 * if the address feild is empty then all addresses
2343 * on the association are effected.
2345 * SPP_PMTUD_DISABLE - This field will disable PMTU
2346 * discovery upon the specified address. Note that
2347 * if the address feild is empty then all addresses
2348 * on the association are effected. Not also that
2349 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2350 * exclusive. Enabling both will have undetermined
2353 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2354 * on delayed sack. The time specified in spp_sackdelay
2355 * is used to specify the sack delay for this address. Note
2356 * that if spp_address is empty then all addresses will
2357 * enable delayed sack and take on the sack delay
2358 * value specified in spp_sackdelay.
2359 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2360 * off delayed sack. If the spp_address field is blank then
2361 * delayed sack is disabled for the entire association. Note
2362 * also that this field is mutually exclusive to
2363 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2366 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2367 struct sctp_transport *trans,
2368 struct sctp_association *asoc,
2369 struct sctp_sock *sp,
2372 int sackdelay_change)
2376 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2377 struct net *net = sock_net(trans->asoc->base.sk);
2379 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2384 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2385 * this field is ignored. Note also that a value of zero indicates
2386 * the current setting should be left unchanged.
2388 if (params->spp_flags & SPP_HB_ENABLE) {
2390 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2391 * set. This lets us use 0 value when this flag
2394 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2395 params->spp_hbinterval = 0;
2397 if (params->spp_hbinterval ||
2398 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2401 msecs_to_jiffies(params->spp_hbinterval);
2404 msecs_to_jiffies(params->spp_hbinterval);
2406 sp->hbinterval = params->spp_hbinterval;
2413 trans->param_flags =
2414 (trans->param_flags & ~SPP_HB) | hb_change;
2417 (asoc->param_flags & ~SPP_HB) | hb_change;
2420 (sp->param_flags & ~SPP_HB) | hb_change;
2424 /* When Path MTU discovery is disabled the value specified here will
2425 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2426 * include the flag SPP_PMTUD_DISABLE for this field to have any
2429 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2431 trans->pathmtu = params->spp_pathmtu;
2432 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2434 asoc->pathmtu = params->spp_pathmtu;
2435 sctp_frag_point(asoc, params->spp_pathmtu);
2437 sp->pathmtu = params->spp_pathmtu;
2443 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2444 (params->spp_flags & SPP_PMTUD_ENABLE);
2445 trans->param_flags =
2446 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2448 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2449 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2453 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2456 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2460 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2461 * value of this field is ignored. Note also that a value of zero
2462 * indicates the current setting should be left unchanged.
2464 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2467 msecs_to_jiffies(params->spp_sackdelay);
2470 msecs_to_jiffies(params->spp_sackdelay);
2472 sp->sackdelay = params->spp_sackdelay;
2476 if (sackdelay_change) {
2478 trans->param_flags =
2479 (trans->param_flags & ~SPP_SACKDELAY) |
2483 (asoc->param_flags & ~SPP_SACKDELAY) |
2487 (sp->param_flags & ~SPP_SACKDELAY) |
2492 /* Note that a value of zero indicates the current setting should be
2495 if (params->spp_pathmaxrxt) {
2497 trans->pathmaxrxt = params->spp_pathmaxrxt;
2499 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2501 sp->pathmaxrxt = params->spp_pathmaxrxt;
2508 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2509 char __user *optval,
2510 unsigned int optlen)
2512 struct sctp_paddrparams params;
2513 struct sctp_transport *trans = NULL;
2514 struct sctp_association *asoc = NULL;
2515 struct sctp_sock *sp = sctp_sk(sk);
2517 int hb_change, pmtud_change, sackdelay_change;
2519 if (optlen != sizeof(struct sctp_paddrparams))
2522 if (copy_from_user(¶ms, optval, optlen))
2525 /* Validate flags and value parameters. */
2526 hb_change = params.spp_flags & SPP_HB;
2527 pmtud_change = params.spp_flags & SPP_PMTUD;
2528 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2530 if (hb_change == SPP_HB ||
2531 pmtud_change == SPP_PMTUD ||
2532 sackdelay_change == SPP_SACKDELAY ||
2533 params.spp_sackdelay > 500 ||
2534 (params.spp_pathmtu &&
2535 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2538 /* If an address other than INADDR_ANY is specified, and
2539 * no transport is found, then the request is invalid.
2541 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2542 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2543 params.spp_assoc_id);
2548 /* Get association, if assoc_id != 0 and the socket is a one
2549 * to many style socket, and an association was not found, then
2550 * the id was invalid.
2552 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2553 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2556 /* Heartbeat demand can only be sent on a transport or
2557 * association, but not a socket.
2559 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2562 /* Process parameters. */
2563 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2564 hb_change, pmtud_change,
2570 /* If changes are for association, also apply parameters to each
2573 if (!trans && asoc) {
2574 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2576 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2577 hb_change, pmtud_change,
2585 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2587 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2590 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2592 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2596 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2598 * This option will effect the way delayed acks are performed. This
2599 * option allows you to get or set the delayed ack time, in
2600 * milliseconds. It also allows changing the delayed ack frequency.
2601 * Changing the frequency to 1 disables the delayed sack algorithm. If
2602 * the assoc_id is 0, then this sets or gets the endpoints default
2603 * values. If the assoc_id field is non-zero, then the set or get
2604 * effects the specified association for the one to many model (the
2605 * assoc_id field is ignored by the one to one model). Note that if
2606 * sack_delay or sack_freq are 0 when setting this option, then the
2607 * current values will remain unchanged.
2609 * struct sctp_sack_info {
2610 * sctp_assoc_t sack_assoc_id;
2611 * uint32_t sack_delay;
2612 * uint32_t sack_freq;
2615 * sack_assoc_id - This parameter, indicates which association the user
2616 * is performing an action upon. Note that if this field's value is
2617 * zero then the endpoints default value is changed (effecting future
2618 * associations only).
2620 * sack_delay - This parameter contains the number of milliseconds that
2621 * the user is requesting the delayed ACK timer be set to. Note that
2622 * this value is defined in the standard to be between 200 and 500
2625 * sack_freq - This parameter contains the number of packets that must
2626 * be received before a sack is sent without waiting for the delay
2627 * timer to expire. The default value for this is 2, setting this
2628 * value to 1 will disable the delayed sack algorithm.
2631 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2632 char __user *optval, unsigned int optlen)
2634 struct sctp_sack_info params;
2635 struct sctp_transport *trans = NULL;
2636 struct sctp_association *asoc = NULL;
2637 struct sctp_sock *sp = sctp_sk(sk);
2639 if (optlen == sizeof(struct sctp_sack_info)) {
2640 if (copy_from_user(¶ms, optval, optlen))
2643 if (params.sack_delay == 0 && params.sack_freq == 0)
2645 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2646 pr_warn_ratelimited(DEPRECATED
2648 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2649 "Use struct sctp_sack_info instead\n",
2650 current->comm, task_pid_nr(current));
2651 if (copy_from_user(¶ms, optval, optlen))
2654 if (params.sack_delay == 0)
2655 params.sack_freq = 1;
2657 params.sack_freq = 0;
2661 /* Validate value parameter. */
2662 if (params.sack_delay > 500)
2665 /* Get association, if sack_assoc_id != 0 and the socket is a one
2666 * to many style socket, and an association was not found, then
2667 * the id was invalid.
2669 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2670 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2673 if (params.sack_delay) {
2676 msecs_to_jiffies(params.sack_delay);
2678 sctp_spp_sackdelay_enable(asoc->param_flags);
2680 sp->sackdelay = params.sack_delay;
2682 sctp_spp_sackdelay_enable(sp->param_flags);
2686 if (params.sack_freq == 1) {
2689 sctp_spp_sackdelay_disable(asoc->param_flags);
2692 sctp_spp_sackdelay_disable(sp->param_flags);
2694 } else if (params.sack_freq > 1) {
2696 asoc->sackfreq = params.sack_freq;
2698 sctp_spp_sackdelay_enable(asoc->param_flags);
2700 sp->sackfreq = params.sack_freq;
2702 sctp_spp_sackdelay_enable(sp->param_flags);
2706 /* If change is for association, also apply to each transport. */
2708 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2710 if (params.sack_delay) {
2712 msecs_to_jiffies(params.sack_delay);
2713 trans->param_flags =
2714 sctp_spp_sackdelay_enable(trans->param_flags);
2716 if (params.sack_freq == 1) {
2717 trans->param_flags =
2718 sctp_spp_sackdelay_disable(trans->param_flags);
2719 } else if (params.sack_freq > 1) {
2720 trans->sackfreq = params.sack_freq;
2721 trans->param_flags =
2722 sctp_spp_sackdelay_enable(trans->param_flags);
2730 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2732 * Applications can specify protocol parameters for the default association
2733 * initialization. The option name argument to setsockopt() and getsockopt()
2736 * Setting initialization parameters is effective only on an unconnected
2737 * socket (for UDP-style sockets only future associations are effected
2738 * by the change). With TCP-style sockets, this option is inherited by
2739 * sockets derived from a listener socket.
2741 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2743 struct sctp_initmsg sinit;
2744 struct sctp_sock *sp = sctp_sk(sk);
2746 if (optlen != sizeof(struct sctp_initmsg))
2748 if (copy_from_user(&sinit, optval, optlen))
2751 if (sinit.sinit_num_ostreams)
2752 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2753 if (sinit.sinit_max_instreams)
2754 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2755 if (sinit.sinit_max_attempts)
2756 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2757 if (sinit.sinit_max_init_timeo)
2758 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2764 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2766 * Applications that wish to use the sendto() system call may wish to
2767 * specify a default set of parameters that would normally be supplied
2768 * through the inclusion of ancillary data. This socket option allows
2769 * such an application to set the default sctp_sndrcvinfo structure.
2770 * The application that wishes to use this socket option simply passes
2771 * in to this call the sctp_sndrcvinfo structure defined in Section
2772 * 5.2.2) The input parameters accepted by this call include
2773 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2774 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2775 * to this call if the caller is using the UDP model.
2777 static int sctp_setsockopt_default_send_param(struct sock *sk,
2778 char __user *optval,
2779 unsigned int optlen)
2781 struct sctp_sock *sp = sctp_sk(sk);
2782 struct sctp_association *asoc;
2783 struct sctp_sndrcvinfo info;
2785 if (optlen != sizeof(info))
2787 if (copy_from_user(&info, optval, optlen))
2789 if (info.sinfo_flags &
2790 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2791 SCTP_ABORT | SCTP_EOF))
2794 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2795 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2798 asoc->default_stream = info.sinfo_stream;
2799 asoc->default_flags = info.sinfo_flags;
2800 asoc->default_ppid = info.sinfo_ppid;
2801 asoc->default_context = info.sinfo_context;
2802 asoc->default_timetolive = info.sinfo_timetolive;
2804 sp->default_stream = info.sinfo_stream;
2805 sp->default_flags = info.sinfo_flags;
2806 sp->default_ppid = info.sinfo_ppid;
2807 sp->default_context = info.sinfo_context;
2808 sp->default_timetolive = info.sinfo_timetolive;
2814 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2815 * (SCTP_DEFAULT_SNDINFO)
2817 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2818 char __user *optval,
2819 unsigned int optlen)
2821 struct sctp_sock *sp = sctp_sk(sk);
2822 struct sctp_association *asoc;
2823 struct sctp_sndinfo info;
2825 if (optlen != sizeof(info))
2827 if (copy_from_user(&info, optval, optlen))
2829 if (info.snd_flags &
2830 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2831 SCTP_ABORT | SCTP_EOF))
2834 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2835 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2838 asoc->default_stream = info.snd_sid;
2839 asoc->default_flags = info.snd_flags;
2840 asoc->default_ppid = info.snd_ppid;
2841 asoc->default_context = info.snd_context;
2843 sp->default_stream = info.snd_sid;
2844 sp->default_flags = info.snd_flags;
2845 sp->default_ppid = info.snd_ppid;
2846 sp->default_context = info.snd_context;
2852 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2854 * Requests that the local SCTP stack use the enclosed peer address as
2855 * the association primary. The enclosed address must be one of the
2856 * association peer's addresses.
2858 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2859 unsigned int optlen)
2861 struct sctp_prim prim;
2862 struct sctp_transport *trans;
2864 if (optlen != sizeof(struct sctp_prim))
2867 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2870 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2874 sctp_assoc_set_primary(trans->asoc, trans);
2880 * 7.1.5 SCTP_NODELAY
2882 * Turn on/off any Nagle-like algorithm. This means that packets are
2883 * generally sent as soon as possible and no unnecessary delays are
2884 * introduced, at the cost of more packets in the network. Expects an
2885 * integer boolean flag.
2887 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2888 unsigned int optlen)
2892 if (optlen < sizeof(int))
2894 if (get_user(val, (int __user *)optval))
2897 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2903 * 7.1.1 SCTP_RTOINFO
2905 * The protocol parameters used to initialize and bound retransmission
2906 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2907 * and modify these parameters.
2908 * All parameters are time values, in milliseconds. A value of 0, when
2909 * modifying the parameters, indicates that the current value should not
2913 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2915 struct sctp_rtoinfo rtoinfo;
2916 struct sctp_association *asoc;
2917 unsigned long rto_min, rto_max;
2918 struct sctp_sock *sp = sctp_sk(sk);
2920 if (optlen != sizeof (struct sctp_rtoinfo))
2923 if (copy_from_user(&rtoinfo, optval, optlen))
2926 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2928 /* Set the values to the specific association */
2929 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2932 rto_max = rtoinfo.srto_max;
2933 rto_min = rtoinfo.srto_min;
2936 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2938 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2941 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2943 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2945 if (rto_min > rto_max)
2949 if (rtoinfo.srto_initial != 0)
2951 msecs_to_jiffies(rtoinfo.srto_initial);
2952 asoc->rto_max = rto_max;
2953 asoc->rto_min = rto_min;
2955 /* If there is no association or the association-id = 0
2956 * set the values to the endpoint.
2958 if (rtoinfo.srto_initial != 0)
2959 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2960 sp->rtoinfo.srto_max = rto_max;
2961 sp->rtoinfo.srto_min = rto_min;
2969 * 7.1.2 SCTP_ASSOCINFO
2971 * This option is used to tune the maximum retransmission attempts
2972 * of the association.
2973 * Returns an error if the new association retransmission value is
2974 * greater than the sum of the retransmission value of the peer.
2975 * See [SCTP] for more information.
2978 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2981 struct sctp_assocparams assocparams;
2982 struct sctp_association *asoc;
2984 if (optlen != sizeof(struct sctp_assocparams))
2986 if (copy_from_user(&assocparams, optval, optlen))
2989 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2991 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2994 /* Set the values to the specific association */
2996 if (assocparams.sasoc_asocmaxrxt != 0) {
2999 struct sctp_transport *peer_addr;
3001 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3003 path_sum += peer_addr->pathmaxrxt;
3007 /* Only validate asocmaxrxt if we have more than
3008 * one path/transport. We do this because path
3009 * retransmissions are only counted when we have more
3013 assocparams.sasoc_asocmaxrxt > path_sum)
3016 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3019 if (assocparams.sasoc_cookie_life != 0)
3020 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3022 /* Set the values to the endpoint */
3023 struct sctp_sock *sp = sctp_sk(sk);
3025 if (assocparams.sasoc_asocmaxrxt != 0)
3026 sp->assocparams.sasoc_asocmaxrxt =
3027 assocparams.sasoc_asocmaxrxt;
3028 if (assocparams.sasoc_cookie_life != 0)
3029 sp->assocparams.sasoc_cookie_life =
3030 assocparams.sasoc_cookie_life;
3036 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3038 * This socket option is a boolean flag which turns on or off mapped V4
3039 * addresses. If this option is turned on and the socket is type
3040 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3041 * If this option is turned off, then no mapping will be done of V4
3042 * addresses and a user will receive both PF_INET6 and PF_INET type
3043 * addresses on the socket.
3045 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3048 struct sctp_sock *sp = sctp_sk(sk);
3050 if (optlen < sizeof(int))
3052 if (get_user(val, (int __user *)optval))
3063 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3064 * This option will get or set the maximum size to put in any outgoing
3065 * SCTP DATA chunk. If a message is larger than this size it will be
3066 * fragmented by SCTP into the specified size. Note that the underlying
3067 * SCTP implementation may fragment into smaller sized chunks when the
3068 * PMTU of the underlying association is smaller than the value set by
3069 * the user. The default value for this option is '0' which indicates
3070 * the user is NOT limiting fragmentation and only the PMTU will effect
3071 * SCTP's choice of DATA chunk size. Note also that values set larger
3072 * than the maximum size of an IP datagram will effectively let SCTP
3073 * control fragmentation (i.e. the same as setting this option to 0).
3075 * The following structure is used to access and modify this parameter:
3077 * struct sctp_assoc_value {
3078 * sctp_assoc_t assoc_id;
3079 * uint32_t assoc_value;
3082 * assoc_id: This parameter is ignored for one-to-one style sockets.
3083 * For one-to-many style sockets this parameter indicates which
3084 * association the user is performing an action upon. Note that if
3085 * this field's value is zero then the endpoints default value is
3086 * changed (effecting future associations only).
3087 * assoc_value: This parameter specifies the maximum size in bytes.
3089 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3091 struct sctp_assoc_value params;
3092 struct sctp_association *asoc;
3093 struct sctp_sock *sp = sctp_sk(sk);
3096 if (optlen == sizeof(int)) {
3097 pr_warn_ratelimited(DEPRECATED
3099 "Use of int in maxseg socket option.\n"
3100 "Use struct sctp_assoc_value instead\n",
3101 current->comm, task_pid_nr(current));
3102 if (copy_from_user(&val, optval, optlen))
3104 params.assoc_id = 0;
3105 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3106 if (copy_from_user(¶ms, optval, optlen))
3108 val = params.assoc_value;
3112 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3115 asoc = sctp_id2assoc(sk, params.assoc_id);
3116 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3121 val = asoc->pathmtu;
3122 val -= sp->pf->af->net_header_len;
3123 val -= sizeof(struct sctphdr) +
3124 sizeof(struct sctp_data_chunk);
3126 asoc->user_frag = val;
3127 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3129 sp->user_frag = val;
3137 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3139 * Requests that the peer mark the enclosed address as the association
3140 * primary. The enclosed address must be one of the association's
3141 * locally bound addresses. The following structure is used to make a
3142 * set primary request:
3144 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3145 unsigned int optlen)
3147 struct net *net = sock_net(sk);
3148 struct sctp_sock *sp;
3149 struct sctp_association *asoc = NULL;
3150 struct sctp_setpeerprim prim;
3151 struct sctp_chunk *chunk;
3157 if (!net->sctp.addip_enable)
3160 if (optlen != sizeof(struct sctp_setpeerprim))
3163 if (copy_from_user(&prim, optval, optlen))
3166 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3170 if (!asoc->peer.asconf_capable)
3173 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3176 if (!sctp_state(asoc, ESTABLISHED))
3179 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3183 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3184 return -EADDRNOTAVAIL;
3186 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3187 return -EADDRNOTAVAIL;
3189 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3190 chunk = sctp_make_asconf_set_prim(asoc,
3191 (union sctp_addr *)&prim.sspp_addr);
3195 err = sctp_send_asconf(asoc, chunk);
3197 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3202 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3203 unsigned int optlen)
3205 struct sctp_setadaptation adaptation;
3207 if (optlen != sizeof(struct sctp_setadaptation))
3209 if (copy_from_user(&adaptation, optval, optlen))
3212 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3218 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3220 * The context field in the sctp_sndrcvinfo structure is normally only
3221 * used when a failed message is retrieved holding the value that was
3222 * sent down on the actual send call. This option allows the setting of
3223 * a default context on an association basis that will be received on
3224 * reading messages from the peer. This is especially helpful in the
3225 * one-2-many model for an application to keep some reference to an
3226 * internal state machine that is processing messages on the
3227 * association. Note that the setting of this value only effects
3228 * received messages from the peer and does not effect the value that is
3229 * saved with outbound messages.
3231 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3232 unsigned int optlen)
3234 struct sctp_assoc_value params;
3235 struct sctp_sock *sp;
3236 struct sctp_association *asoc;
3238 if (optlen != sizeof(struct sctp_assoc_value))
3240 if (copy_from_user(¶ms, optval, optlen))
3245 if (params.assoc_id != 0) {
3246 asoc = sctp_id2assoc(sk, params.assoc_id);
3249 asoc->default_rcv_context = params.assoc_value;
3251 sp->default_rcv_context = params.assoc_value;
3258 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3260 * This options will at a minimum specify if the implementation is doing
3261 * fragmented interleave. Fragmented interleave, for a one to many
3262 * socket, is when subsequent calls to receive a message may return
3263 * parts of messages from different associations. Some implementations
3264 * may allow you to turn this value on or off. If so, when turned off,
3265 * no fragment interleave will occur (which will cause a head of line
3266 * blocking amongst multiple associations sharing the same one to many
3267 * socket). When this option is turned on, then each receive call may
3268 * come from a different association (thus the user must receive data
3269 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3270 * association each receive belongs to.
3272 * This option takes a boolean value. A non-zero value indicates that
3273 * fragmented interleave is on. A value of zero indicates that
3274 * fragmented interleave is off.
3276 * Note that it is important that an implementation that allows this
3277 * option to be turned on, have it off by default. Otherwise an unaware
3278 * application using the one to many model may become confused and act
3281 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3282 char __user *optval,
3283 unsigned int optlen)
3287 if (optlen != sizeof(int))
3289 if (get_user(val, (int __user *)optval))
3292 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3298 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3299 * (SCTP_PARTIAL_DELIVERY_POINT)
3301 * This option will set or get the SCTP partial delivery point. This
3302 * point is the size of a message where the partial delivery API will be
3303 * invoked to help free up rwnd space for the peer. Setting this to a
3304 * lower value will cause partial deliveries to happen more often. The
3305 * calls argument is an integer that sets or gets the partial delivery
3306 * point. Note also that the call will fail if the user attempts to set
3307 * this value larger than the socket receive buffer size.
3309 * Note that any single message having a length smaller than or equal to
3310 * the SCTP partial delivery point will be delivered in one single read
3311 * call as long as the user provided buffer is large enough to hold the
3314 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3315 char __user *optval,
3316 unsigned int optlen)
3320 if (optlen != sizeof(u32))
3322 if (get_user(val, (int __user *)optval))
3325 /* Note: We double the receive buffer from what the user sets
3326 * it to be, also initial rwnd is based on rcvbuf/2.
3328 if (val > (sk->sk_rcvbuf >> 1))
3331 sctp_sk(sk)->pd_point = val;
3333 return 0; /* is this the right error code? */
3337 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3339 * This option will allow a user to change the maximum burst of packets
3340 * that can be emitted by this association. Note that the default value
3341 * is 4, and some implementations may restrict this setting so that it
3342 * can only be lowered.
3344 * NOTE: This text doesn't seem right. Do this on a socket basis with
3345 * future associations inheriting the socket value.
3347 static int sctp_setsockopt_maxburst(struct sock *sk,
3348 char __user *optval,
3349 unsigned int optlen)
3351 struct sctp_assoc_value params;
3352 struct sctp_sock *sp;
3353 struct sctp_association *asoc;
3357 if (optlen == sizeof(int)) {
3358 pr_warn_ratelimited(DEPRECATED
3360 "Use of int in max_burst socket option deprecated.\n"
3361 "Use struct sctp_assoc_value instead\n",
3362 current->comm, task_pid_nr(current));
3363 if (copy_from_user(&val, optval, optlen))
3365 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3366 if (copy_from_user(¶ms, optval, optlen))
3368 val = params.assoc_value;
3369 assoc_id = params.assoc_id;
3375 if (assoc_id != 0) {
3376 asoc = sctp_id2assoc(sk, assoc_id);
3379 asoc->max_burst = val;
3381 sp->max_burst = val;
3387 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3389 * This set option adds a chunk type that the user is requesting to be
3390 * received only in an authenticated way. Changes to the list of chunks
3391 * will only effect future associations on the socket.
3393 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3394 char __user *optval,
3395 unsigned int optlen)
3397 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3398 struct sctp_authchunk val;
3400 if (!ep->auth_enable)
3403 if (optlen != sizeof(struct sctp_authchunk))
3405 if (copy_from_user(&val, optval, optlen))
3408 switch (val.sauth_chunk) {
3410 case SCTP_CID_INIT_ACK:
3411 case SCTP_CID_SHUTDOWN_COMPLETE:
3416 /* add this chunk id to the endpoint */
3417 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3421 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3423 * This option gets or sets the list of HMAC algorithms that the local
3424 * endpoint requires the peer to use.
3426 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3427 char __user *optval,
3428 unsigned int optlen)
3430 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3431 struct sctp_hmacalgo *hmacs;
3435 if (!ep->auth_enable)
3438 if (optlen < sizeof(struct sctp_hmacalgo))
3441 hmacs = memdup_user(optval, optlen);
3443 return PTR_ERR(hmacs);
3445 idents = hmacs->shmac_num_idents;
3446 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3447 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3452 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3459 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3461 * This option will set a shared secret key which is used to build an
3462 * association shared key.
3464 static int sctp_setsockopt_auth_key(struct sock *sk,
3465 char __user *optval,
3466 unsigned int optlen)
3468 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3469 struct sctp_authkey *authkey;
3470 struct sctp_association *asoc;
3473 if (!ep->auth_enable)
3476 if (optlen <= sizeof(struct sctp_authkey))
3479 authkey = memdup_user(optval, optlen);
3480 if (IS_ERR(authkey))
3481 return PTR_ERR(authkey);
3483 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3488 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3489 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3494 ret = sctp_auth_set_key(ep, asoc, authkey);
3501 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3503 * This option will get or set the active shared key to be used to build
3504 * the association shared key.
3506 static int sctp_setsockopt_active_key(struct sock *sk,
3507 char __user *optval,
3508 unsigned int optlen)
3510 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3511 struct sctp_authkeyid val;
3512 struct sctp_association *asoc;
3514 if (!ep->auth_enable)
3517 if (optlen != sizeof(struct sctp_authkeyid))
3519 if (copy_from_user(&val, optval, optlen))
3522 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3523 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3526 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3530 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3532 * This set option will delete a shared secret key from use.
3534 static int sctp_setsockopt_del_key(struct sock *sk,
3535 char __user *optval,
3536 unsigned int optlen)
3538 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3539 struct sctp_authkeyid val;
3540 struct sctp_association *asoc;
3542 if (!ep->auth_enable)
3545 if (optlen != sizeof(struct sctp_authkeyid))
3547 if (copy_from_user(&val, optval, optlen))
3550 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3551 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3554 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3559 * 8.1.23 SCTP_AUTO_ASCONF
3561 * This option will enable or disable the use of the automatic generation of
3562 * ASCONF chunks to add and delete addresses to an existing association. Note
3563 * that this option has two caveats namely: a) it only affects sockets that
3564 * are bound to all addresses available to the SCTP stack, and b) the system
3565 * administrator may have an overriding control that turns the ASCONF feature
3566 * off no matter what setting the socket option may have.
3567 * This option expects an integer boolean flag, where a non-zero value turns on
3568 * the option, and a zero value turns off the option.
3569 * Note. In this implementation, socket operation overrides default parameter
3570 * being set by sysctl as well as FreeBSD implementation
3572 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3573 unsigned int optlen)
3576 struct sctp_sock *sp = sctp_sk(sk);
3578 if (optlen < sizeof(int))
3580 if (get_user(val, (int __user *)optval))
3582 if (!sctp_is_ep_boundall(sk) && val)
3584 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3587 if (val == 0 && sp->do_auto_asconf) {
3588 list_del(&sp->auto_asconf_list);
3589 sp->do_auto_asconf = 0;
3590 } else if (val && !sp->do_auto_asconf) {
3591 list_add_tail(&sp->auto_asconf_list,
3592 &sock_net(sk)->sctp.auto_asconf_splist);
3593 sp->do_auto_asconf = 1;
3599 * SCTP_PEER_ADDR_THLDS
3601 * This option allows us to alter the partially failed threshold for one or all
3602 * transports in an association. See Section 6.1 of:
3603 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3605 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3606 char __user *optval,
3607 unsigned int optlen)
3609 struct sctp_paddrthlds val;
3610 struct sctp_transport *trans;
3611 struct sctp_association *asoc;
3613 if (optlen < sizeof(struct sctp_paddrthlds))
3615 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3616 sizeof(struct sctp_paddrthlds)))
3620 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3621 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3624 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3626 if (val.spt_pathmaxrxt)
3627 trans->pathmaxrxt = val.spt_pathmaxrxt;
3628 trans->pf_retrans = val.spt_pathpfthld;
3631 if (val.spt_pathmaxrxt)
3632 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3633 asoc->pf_retrans = val.spt_pathpfthld;
3635 trans = sctp_addr_id2transport(sk, &val.spt_address,
3640 if (val.spt_pathmaxrxt)
3641 trans->pathmaxrxt = val.spt_pathmaxrxt;
3642 trans->pf_retrans = val.spt_pathpfthld;
3648 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3649 char __user *optval,
3650 unsigned int optlen)
3654 if (optlen < sizeof(int))
3656 if (get_user(val, (int __user *) optval))
3659 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3664 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3665 char __user *optval,
3666 unsigned int optlen)
3670 if (optlen < sizeof(int))
3672 if (get_user(val, (int __user *) optval))
3675 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3680 /* API 6.2 setsockopt(), getsockopt()
3682 * Applications use setsockopt() and getsockopt() to set or retrieve
3683 * socket options. Socket options are used to change the default
3684 * behavior of sockets calls. They are described in Section 7.
3688 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3689 * int __user *optlen);
3690 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3693 * sd - the socket descript.
3694 * level - set to IPPROTO_SCTP for all SCTP options.
3695 * optname - the option name.
3696 * optval - the buffer to store the value of the option.
3697 * optlen - the size of the buffer.
3699 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3700 char __user *optval, unsigned int optlen)
3704 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3706 /* I can hardly begin to describe how wrong this is. This is
3707 * so broken as to be worse than useless. The API draft
3708 * REALLY is NOT helpful here... I am not convinced that the
3709 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3710 * are at all well-founded.
3712 if (level != SOL_SCTP) {
3713 struct sctp_af *af = sctp_sk(sk)->pf->af;
3714 retval = af->setsockopt(sk, level, optname, optval, optlen);
3721 case SCTP_SOCKOPT_BINDX_ADD:
3722 /* 'optlen' is the size of the addresses buffer. */
3723 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3724 optlen, SCTP_BINDX_ADD_ADDR);
3727 case SCTP_SOCKOPT_BINDX_REM:
3728 /* 'optlen' is the size of the addresses buffer. */
3729 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3730 optlen, SCTP_BINDX_REM_ADDR);
3733 case SCTP_SOCKOPT_CONNECTX_OLD:
3734 /* 'optlen' is the size of the addresses buffer. */
3735 retval = sctp_setsockopt_connectx_old(sk,
3736 (struct sockaddr __user *)optval,
3740 case SCTP_SOCKOPT_CONNECTX:
3741 /* 'optlen' is the size of the addresses buffer. */
3742 retval = sctp_setsockopt_connectx(sk,
3743 (struct sockaddr __user *)optval,
3747 case SCTP_DISABLE_FRAGMENTS:
3748 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3752 retval = sctp_setsockopt_events(sk, optval, optlen);
3755 case SCTP_AUTOCLOSE:
3756 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3759 case SCTP_PEER_ADDR_PARAMS:
3760 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3763 case SCTP_DELAYED_SACK:
3764 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3766 case SCTP_PARTIAL_DELIVERY_POINT:
3767 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3771 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3773 case SCTP_DEFAULT_SEND_PARAM:
3774 retval = sctp_setsockopt_default_send_param(sk, optval,
3777 case SCTP_DEFAULT_SNDINFO:
3778 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3780 case SCTP_PRIMARY_ADDR:
3781 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3783 case SCTP_SET_PEER_PRIMARY_ADDR:
3784 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3787 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3790 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3792 case SCTP_ASSOCINFO:
3793 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3795 case SCTP_I_WANT_MAPPED_V4_ADDR:
3796 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3799 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3801 case SCTP_ADAPTATION_LAYER:
3802 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3805 retval = sctp_setsockopt_context(sk, optval, optlen);
3807 case SCTP_FRAGMENT_INTERLEAVE:
3808 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3810 case SCTP_MAX_BURST:
3811 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3813 case SCTP_AUTH_CHUNK:
3814 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3816 case SCTP_HMAC_IDENT:
3817 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3820 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3822 case SCTP_AUTH_ACTIVE_KEY:
3823 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3825 case SCTP_AUTH_DELETE_KEY:
3826 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3828 case SCTP_AUTO_ASCONF:
3829 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3831 case SCTP_PEER_ADDR_THLDS:
3832 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3834 case SCTP_RECVRCVINFO:
3835 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3837 case SCTP_RECVNXTINFO:
3838 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3841 retval = -ENOPROTOOPT;
3851 /* API 3.1.6 connect() - UDP Style Syntax
3853 * An application may use the connect() call in the UDP model to initiate an
3854 * association without sending data.
3858 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3860 * sd: the socket descriptor to have a new association added to.
3862 * nam: the address structure (either struct sockaddr_in or struct
3863 * sockaddr_in6 defined in RFC2553 [7]).
3865 * len: the size of the address.
3867 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3875 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3878 /* Validate addr_len before calling common connect/connectx routine. */
3879 af = sctp_get_af_specific(addr->sa_family);
3880 if (!af || addr_len < af->sockaddr_len) {
3883 /* Pass correct addr len to common routine (so it knows there
3884 * is only one address being passed.
3886 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3893 /* FIXME: Write comments. */
3894 static int sctp_disconnect(struct sock *sk, int flags)
3896 return -EOPNOTSUPP; /* STUB */
3899 /* 4.1.4 accept() - TCP Style Syntax
3901 * Applications use accept() call to remove an established SCTP
3902 * association from the accept queue of the endpoint. A new socket
3903 * descriptor will be returned from accept() to represent the newly
3904 * formed association.
3906 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3908 struct sctp_sock *sp;
3909 struct sctp_endpoint *ep;
3910 struct sock *newsk = NULL;
3911 struct sctp_association *asoc;
3920 if (!sctp_style(sk, TCP)) {
3921 error = -EOPNOTSUPP;
3925 if (!sctp_sstate(sk, LISTENING)) {
3930 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3932 error = sctp_wait_for_accept(sk, timeo);
3936 /* We treat the list of associations on the endpoint as the accept
3937 * queue and pick the first association on the list.
3939 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3941 newsk = sp->pf->create_accept_sk(sk, asoc);
3947 /* Populate the fields of the newsk from the oldsk and migrate the
3948 * asoc to the newsk.
3950 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3958 /* The SCTP ioctl handler. */
3959 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3966 * SEQPACKET-style sockets in LISTENING state are valid, for
3967 * SCTP, so only discard TCP-style sockets in LISTENING state.
3969 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3974 struct sk_buff *skb;
3975 unsigned int amount = 0;
3977 skb = skb_peek(&sk->sk_receive_queue);
3980 * We will only return the amount of this packet since
3981 * that is all that will be read.
3985 rc = put_user(amount, (int __user *)arg);
3997 /* This is the function which gets called during socket creation to
3998 * initialized the SCTP-specific portion of the sock.
3999 * The sock structure should already be zero-filled memory.
4001 static int sctp_init_sock(struct sock *sk)
4003 struct net *net = sock_net(sk);
4004 struct sctp_sock *sp;
4006 pr_debug("%s: sk:%p\n", __func__, sk);
4010 /* Initialize the SCTP per socket area. */
4011 switch (sk->sk_type) {
4012 case SOCK_SEQPACKET:
4013 sp->type = SCTP_SOCKET_UDP;
4016 sp->type = SCTP_SOCKET_TCP;
4019 return -ESOCKTNOSUPPORT;
4022 /* Initialize default send parameters. These parameters can be
4023 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4025 sp->default_stream = 0;
4026 sp->default_ppid = 0;
4027 sp->default_flags = 0;
4028 sp->default_context = 0;
4029 sp->default_timetolive = 0;
4031 sp->default_rcv_context = 0;
4032 sp->max_burst = net->sctp.max_burst;
4034 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4036 /* Initialize default setup parameters. These parameters
4037 * can be modified with the SCTP_INITMSG socket option or
4038 * overridden by the SCTP_INIT CMSG.
4040 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4041 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4042 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4043 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4045 /* Initialize default RTO related parameters. These parameters can
4046 * be modified for with the SCTP_RTOINFO socket option.
4048 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4049 sp->rtoinfo.srto_max = net->sctp.rto_max;
4050 sp->rtoinfo.srto_min = net->sctp.rto_min;
4052 /* Initialize default association related parameters. These parameters
4053 * can be modified with the SCTP_ASSOCINFO socket option.
4055 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4056 sp->assocparams.sasoc_number_peer_destinations = 0;
4057 sp->assocparams.sasoc_peer_rwnd = 0;
4058 sp->assocparams.sasoc_local_rwnd = 0;
4059 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4061 /* Initialize default event subscriptions. By default, all the
4064 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4066 /* Default Peer Address Parameters. These defaults can
4067 * be modified via SCTP_PEER_ADDR_PARAMS
4069 sp->hbinterval = net->sctp.hb_interval;
4070 sp->pathmaxrxt = net->sctp.max_retrans_path;
4071 sp->pathmtu = 0; /* allow default discovery */
4072 sp->sackdelay = net->sctp.sack_timeout;
4074 sp->param_flags = SPP_HB_ENABLE |
4076 SPP_SACKDELAY_ENABLE;
4078 /* If enabled no SCTP message fragmentation will be performed.
4079 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4081 sp->disable_fragments = 0;
4083 /* Enable Nagle algorithm by default. */
4086 sp->recvrcvinfo = 0;
4087 sp->recvnxtinfo = 0;
4089 /* Enable by default. */
4092 /* Auto-close idle associations after the configured
4093 * number of seconds. A value of 0 disables this
4094 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4095 * for UDP-style sockets only.
4099 /* User specified fragmentation limit. */
4102 sp->adaptation_ind = 0;
4104 sp->pf = sctp_get_pf_specific(sk->sk_family);
4106 /* Control variables for partial data delivery. */
4107 atomic_set(&sp->pd_mode, 0);
4108 skb_queue_head_init(&sp->pd_lobby);
4109 sp->frag_interleave = 0;
4111 /* Create a per socket endpoint structure. Even if we
4112 * change the data structure relationships, this may still
4113 * be useful for storing pre-connect address information.
4115 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4121 sk->sk_destruct = sctp_destruct_sock;
4123 SCTP_DBG_OBJCNT_INC(sock);
4126 percpu_counter_inc(&sctp_sockets_allocated);
4127 sock_prot_inuse_add(net, sk->sk_prot, 1);
4128 if (net->sctp.default_auto_asconf) {
4129 list_add_tail(&sp->auto_asconf_list,
4130 &net->sctp.auto_asconf_splist);
4131 sp->do_auto_asconf = 1;
4133 sp->do_auto_asconf = 0;
4139 /* Cleanup any SCTP per socket resources. */
4140 static void sctp_destroy_sock(struct sock *sk)
4142 struct sctp_sock *sp;
4144 pr_debug("%s: sk:%p\n", __func__, sk);
4146 /* Release our hold on the endpoint. */
4148 /* This could happen during socket init, thus we bail out
4149 * early, since the rest of the below is not setup either.
4154 if (sp->do_auto_asconf) {
4155 sp->do_auto_asconf = 0;
4156 list_del(&sp->auto_asconf_list);
4158 sctp_endpoint_free(sp->ep);
4160 percpu_counter_dec(&sctp_sockets_allocated);
4161 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4165 /* Triggered when there are no references on the socket anymore */
4166 static void sctp_destruct_sock(struct sock *sk)
4168 struct sctp_sock *sp = sctp_sk(sk);
4170 /* Free up the HMAC transform. */
4171 crypto_free_hash(sp->hmac);
4173 inet_sock_destruct(sk);
4176 /* API 4.1.7 shutdown() - TCP Style Syntax
4177 * int shutdown(int socket, int how);
4179 * sd - the socket descriptor of the association to be closed.
4180 * how - Specifies the type of shutdown. The values are
4183 * Disables further receive operations. No SCTP
4184 * protocol action is taken.
4186 * Disables further send operations, and initiates
4187 * the SCTP shutdown sequence.
4189 * Disables further send and receive operations
4190 * and initiates the SCTP shutdown sequence.
4192 static void sctp_shutdown(struct sock *sk, int how)
4194 struct net *net = sock_net(sk);
4195 struct sctp_endpoint *ep;
4196 struct sctp_association *asoc;
4198 if (!sctp_style(sk, TCP))
4201 if (how & SEND_SHUTDOWN) {
4202 ep = sctp_sk(sk)->ep;
4203 if (!list_empty(&ep->asocs)) {
4204 asoc = list_entry(ep->asocs.next,
4205 struct sctp_association, asocs);
4206 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4211 /* 7.2.1 Association Status (SCTP_STATUS)
4213 * Applications can retrieve current status information about an
4214 * association, including association state, peer receiver window size,
4215 * number of unacked data chunks, and number of data chunks pending
4216 * receipt. This information is read-only.
4218 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4219 char __user *optval,
4222 struct sctp_status status;
4223 struct sctp_association *asoc = NULL;
4224 struct sctp_transport *transport;
4225 sctp_assoc_t associd;
4228 if (len < sizeof(status)) {
4233 len = sizeof(status);
4234 if (copy_from_user(&status, optval, len)) {
4239 associd = status.sstat_assoc_id;
4240 asoc = sctp_id2assoc(sk, associd);
4246 transport = asoc->peer.primary_path;
4248 status.sstat_assoc_id = sctp_assoc2id(asoc);
4249 status.sstat_state = sctp_assoc_to_state(asoc);
4250 status.sstat_rwnd = asoc->peer.rwnd;
4251 status.sstat_unackdata = asoc->unack_data;
4253 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4254 status.sstat_instrms = asoc->c.sinit_max_instreams;
4255 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4256 status.sstat_fragmentation_point = asoc->frag_point;
4257 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4258 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4259 transport->af_specific->sockaddr_len);
4260 /* Map ipv4 address into v4-mapped-on-v6 address. */
4261 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4262 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4263 status.sstat_primary.spinfo_state = transport->state;
4264 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4265 status.sstat_primary.spinfo_srtt = transport->srtt;
4266 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4267 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4269 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4270 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4272 if (put_user(len, optlen)) {
4277 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4278 __func__, len, status.sstat_state, status.sstat_rwnd,
4279 status.sstat_assoc_id);
4281 if (copy_to_user(optval, &status, len)) {
4291 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4293 * Applications can retrieve information about a specific peer address
4294 * of an association, including its reachability state, congestion
4295 * window, and retransmission timer values. This information is
4298 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4299 char __user *optval,
4302 struct sctp_paddrinfo pinfo;
4303 struct sctp_transport *transport;
4306 if (len < sizeof(pinfo)) {
4311 len = sizeof(pinfo);
4312 if (copy_from_user(&pinfo, optval, len)) {
4317 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4318 pinfo.spinfo_assoc_id);
4322 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4323 pinfo.spinfo_state = transport->state;
4324 pinfo.spinfo_cwnd = transport->cwnd;
4325 pinfo.spinfo_srtt = transport->srtt;
4326 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4327 pinfo.spinfo_mtu = transport->pathmtu;
4329 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4330 pinfo.spinfo_state = SCTP_ACTIVE;
4332 if (put_user(len, optlen)) {
4337 if (copy_to_user(optval, &pinfo, len)) {
4346 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4348 * This option is a on/off flag. If enabled no SCTP message
4349 * fragmentation will be performed. Instead if a message being sent
4350 * exceeds the current PMTU size, the message will NOT be sent and
4351 * instead a error will be indicated to the user.
4353 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4354 char __user *optval, int __user *optlen)
4358 if (len < sizeof(int))
4362 val = (sctp_sk(sk)->disable_fragments == 1);
4363 if (put_user(len, optlen))
4365 if (copy_to_user(optval, &val, len))
4370 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4372 * This socket option is used to specify various notifications and
4373 * ancillary data the user wishes to receive.
4375 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4380 if (len > sizeof(struct sctp_event_subscribe))
4381 len = sizeof(struct sctp_event_subscribe);
4382 if (put_user(len, optlen))
4384 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4389 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4391 * This socket option is applicable to the UDP-style socket only. When
4392 * set it will cause associations that are idle for more than the
4393 * specified number of seconds to automatically close. An association
4394 * being idle is defined an association that has NOT sent or received
4395 * user data. The special value of '0' indicates that no automatic
4396 * close of any associations should be performed. The option expects an
4397 * integer defining the number of seconds of idle time before an
4398 * association is closed.
4400 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4402 /* Applicable to UDP-style socket only */
4403 if (sctp_style(sk, TCP))
4405 if (len < sizeof(int))
4408 if (put_user(len, optlen))
4410 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4415 /* Helper routine to branch off an association to a new socket. */
4416 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4418 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4419 struct sctp_sock *sp = sctp_sk(sk);
4420 struct socket *sock;
4426 /* An association cannot be branched off from an already peeled-off
4427 * socket, nor is this supported for tcp style sockets.
4429 if (!sctp_style(sk, UDP))
4432 /* Create a new socket. */
4433 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4437 sctp_copy_sock(sock->sk, sk, asoc);
4439 /* Make peeled-off sockets more like 1-1 accepted sockets.
4440 * Set the daddr and initialize id to something more random
4442 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4444 /* Populate the fields of the newsk from the oldsk and migrate the
4445 * asoc to the newsk.
4447 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4453 EXPORT_SYMBOL(sctp_do_peeloff);
4455 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4457 sctp_peeloff_arg_t peeloff;
4458 struct socket *newsock;
4459 struct file *newfile;
4462 if (len < sizeof(sctp_peeloff_arg_t))
4464 len = sizeof(sctp_peeloff_arg_t);
4465 if (copy_from_user(&peeloff, optval, len))
4468 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4472 /* Map the socket to an unused fd that can be returned to the user. */
4473 retval = get_unused_fd_flags(0);
4475 sock_release(newsock);
4479 newfile = sock_alloc_file(newsock, 0, NULL);
4480 if (unlikely(IS_ERR(newfile))) {
4481 put_unused_fd(retval);
4482 sock_release(newsock);
4483 return PTR_ERR(newfile);
4486 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4489 /* Return the fd mapped to the new socket. */
4490 if (put_user(len, optlen)) {
4492 put_unused_fd(retval);
4495 peeloff.sd = retval;
4496 if (copy_to_user(optval, &peeloff, len)) {
4498 put_unused_fd(retval);
4501 fd_install(retval, newfile);
4506 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4508 * Applications can enable or disable heartbeats for any peer address of
4509 * an association, modify an address's heartbeat interval, force a
4510 * heartbeat to be sent immediately, and adjust the address's maximum
4511 * number of retransmissions sent before an address is considered
4512 * unreachable. The following structure is used to access and modify an
4513 * address's parameters:
4515 * struct sctp_paddrparams {
4516 * sctp_assoc_t spp_assoc_id;
4517 * struct sockaddr_storage spp_address;
4518 * uint32_t spp_hbinterval;
4519 * uint16_t spp_pathmaxrxt;
4520 * uint32_t spp_pathmtu;
4521 * uint32_t spp_sackdelay;
4522 * uint32_t spp_flags;
4525 * spp_assoc_id - (one-to-many style socket) This is filled in the
4526 * application, and identifies the association for
4528 * spp_address - This specifies which address is of interest.
4529 * spp_hbinterval - This contains the value of the heartbeat interval,
4530 * in milliseconds. If a value of zero
4531 * is present in this field then no changes are to
4532 * be made to this parameter.
4533 * spp_pathmaxrxt - This contains the maximum number of
4534 * retransmissions before this address shall be
4535 * considered unreachable. If a value of zero
4536 * is present in this field then no changes are to
4537 * be made to this parameter.
4538 * spp_pathmtu - When Path MTU discovery is disabled the value
4539 * specified here will be the "fixed" path mtu.
4540 * Note that if the spp_address field is empty
4541 * then all associations on this address will
4542 * have this fixed path mtu set upon them.
4544 * spp_sackdelay - When delayed sack is enabled, this value specifies
4545 * the number of milliseconds that sacks will be delayed
4546 * for. This value will apply to all addresses of an
4547 * association if the spp_address field is empty. Note
4548 * also, that if delayed sack is enabled and this
4549 * value is set to 0, no change is made to the last
4550 * recorded delayed sack timer value.
4552 * spp_flags - These flags are used to control various features
4553 * on an association. The flag field may contain
4554 * zero or more of the following options.
4556 * SPP_HB_ENABLE - Enable heartbeats on the
4557 * specified address. Note that if the address
4558 * field is empty all addresses for the association
4559 * have heartbeats enabled upon them.
4561 * SPP_HB_DISABLE - Disable heartbeats on the
4562 * speicifed address. Note that if the address
4563 * field is empty all addresses for the association
4564 * will have their heartbeats disabled. Note also
4565 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4566 * mutually exclusive, only one of these two should
4567 * be specified. Enabling both fields will have
4568 * undetermined results.
4570 * SPP_HB_DEMAND - Request a user initiated heartbeat
4571 * to be made immediately.
4573 * SPP_PMTUD_ENABLE - This field will enable PMTU
4574 * discovery upon the specified address. Note that
4575 * if the address feild is empty then all addresses
4576 * on the association are effected.
4578 * SPP_PMTUD_DISABLE - This field will disable PMTU
4579 * discovery upon the specified address. Note that
4580 * if the address feild is empty then all addresses
4581 * on the association are effected. Not also that
4582 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4583 * exclusive. Enabling both will have undetermined
4586 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4587 * on delayed sack. The time specified in spp_sackdelay
4588 * is used to specify the sack delay for this address. Note
4589 * that if spp_address is empty then all addresses will
4590 * enable delayed sack and take on the sack delay
4591 * value specified in spp_sackdelay.
4592 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4593 * off delayed sack. If the spp_address field is blank then
4594 * delayed sack is disabled for the entire association. Note
4595 * also that this field is mutually exclusive to
4596 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4599 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4600 char __user *optval, int __user *optlen)
4602 struct sctp_paddrparams params;
4603 struct sctp_transport *trans = NULL;
4604 struct sctp_association *asoc = NULL;
4605 struct sctp_sock *sp = sctp_sk(sk);
4607 if (len < sizeof(struct sctp_paddrparams))
4609 len = sizeof(struct sctp_paddrparams);
4610 if (copy_from_user(¶ms, optval, len))
4613 /* If an address other than INADDR_ANY is specified, and
4614 * no transport is found, then the request is invalid.
4616 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4617 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4618 params.spp_assoc_id);
4620 pr_debug("%s: failed no transport\n", __func__);
4625 /* Get association, if assoc_id != 0 and the socket is a one
4626 * to many style socket, and an association was not found, then
4627 * the id was invalid.
4629 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4630 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4631 pr_debug("%s: failed no association\n", __func__);
4636 /* Fetch transport values. */
4637 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4638 params.spp_pathmtu = trans->pathmtu;
4639 params.spp_pathmaxrxt = trans->pathmaxrxt;
4640 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4642 /*draft-11 doesn't say what to return in spp_flags*/
4643 params.spp_flags = trans->param_flags;
4645 /* Fetch association values. */
4646 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4647 params.spp_pathmtu = asoc->pathmtu;
4648 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4649 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4651 /*draft-11 doesn't say what to return in spp_flags*/
4652 params.spp_flags = asoc->param_flags;
4654 /* Fetch socket values. */
4655 params.spp_hbinterval = sp->hbinterval;
4656 params.spp_pathmtu = sp->pathmtu;
4657 params.spp_sackdelay = sp->sackdelay;
4658 params.spp_pathmaxrxt = sp->pathmaxrxt;
4660 /*draft-11 doesn't say what to return in spp_flags*/
4661 params.spp_flags = sp->param_flags;
4664 if (copy_to_user(optval, ¶ms, len))
4667 if (put_user(len, optlen))
4674 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4676 * This option will effect the way delayed acks are performed. This
4677 * option allows you to get or set the delayed ack time, in
4678 * milliseconds. It also allows changing the delayed ack frequency.
4679 * Changing the frequency to 1 disables the delayed sack algorithm. If
4680 * the assoc_id is 0, then this sets or gets the endpoints default
4681 * values. If the assoc_id field is non-zero, then the set or get
4682 * effects the specified association for the one to many model (the
4683 * assoc_id field is ignored by the one to one model). Note that if
4684 * sack_delay or sack_freq are 0 when setting this option, then the
4685 * current values will remain unchanged.
4687 * struct sctp_sack_info {
4688 * sctp_assoc_t sack_assoc_id;
4689 * uint32_t sack_delay;
4690 * uint32_t sack_freq;
4693 * sack_assoc_id - This parameter, indicates which association the user
4694 * is performing an action upon. Note that if this field's value is
4695 * zero then the endpoints default value is changed (effecting future
4696 * associations only).
4698 * sack_delay - This parameter contains the number of milliseconds that
4699 * the user is requesting the delayed ACK timer be set to. Note that
4700 * this value is defined in the standard to be between 200 and 500
4703 * sack_freq - This parameter contains the number of packets that must
4704 * be received before a sack is sent without waiting for the delay
4705 * timer to expire. The default value for this is 2, setting this
4706 * value to 1 will disable the delayed sack algorithm.
4708 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4709 char __user *optval,
4712 struct sctp_sack_info params;
4713 struct sctp_association *asoc = NULL;
4714 struct sctp_sock *sp = sctp_sk(sk);
4716 if (len >= sizeof(struct sctp_sack_info)) {
4717 len = sizeof(struct sctp_sack_info);
4719 if (copy_from_user(¶ms, optval, len))
4721 } else if (len == sizeof(struct sctp_assoc_value)) {
4722 pr_warn_ratelimited(DEPRECATED
4724 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4725 "Use struct sctp_sack_info instead\n",
4726 current->comm, task_pid_nr(current));
4727 if (copy_from_user(¶ms, optval, len))
4732 /* Get association, if sack_assoc_id != 0 and the socket is a one
4733 * to many style socket, and an association was not found, then
4734 * the id was invalid.
4736 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4737 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4741 /* Fetch association values. */
4742 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4743 params.sack_delay = jiffies_to_msecs(
4745 params.sack_freq = asoc->sackfreq;
4748 params.sack_delay = 0;
4749 params.sack_freq = 1;
4752 /* Fetch socket values. */
4753 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4754 params.sack_delay = sp->sackdelay;
4755 params.sack_freq = sp->sackfreq;
4757 params.sack_delay = 0;
4758 params.sack_freq = 1;
4762 if (copy_to_user(optval, ¶ms, len))
4765 if (put_user(len, optlen))
4771 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4773 * Applications can specify protocol parameters for the default association
4774 * initialization. The option name argument to setsockopt() and getsockopt()
4777 * Setting initialization parameters is effective only on an unconnected
4778 * socket (for UDP-style sockets only future associations are effected
4779 * by the change). With TCP-style sockets, this option is inherited by
4780 * sockets derived from a listener socket.
4782 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4784 if (len < sizeof(struct sctp_initmsg))
4786 len = sizeof(struct sctp_initmsg);
4787 if (put_user(len, optlen))
4789 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4795 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4796 char __user *optval, int __user *optlen)
4798 struct sctp_association *asoc;
4800 struct sctp_getaddrs getaddrs;
4801 struct sctp_transport *from;
4803 union sctp_addr temp;
4804 struct sctp_sock *sp = sctp_sk(sk);
4809 if (len < sizeof(struct sctp_getaddrs))
4812 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4815 /* For UDP-style sockets, id specifies the association to query. */
4816 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4820 to = optval + offsetof(struct sctp_getaddrs, addrs);
4821 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4823 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4825 memcpy(&temp, &from->ipaddr, sizeof(temp));
4826 addrlen = sctp_get_pf_specific(sk->sk_family)
4827 ->addr_to_user(sp, &temp);
4828 if (space_left < addrlen)
4830 if (copy_to_user(to, &temp, addrlen))
4834 space_left -= addrlen;
4837 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4839 bytes_copied = ((char __user *)to) - optval;
4840 if (put_user(bytes_copied, optlen))
4846 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4847 size_t space_left, int *bytes_copied)
4849 struct sctp_sockaddr_entry *addr;
4850 union sctp_addr temp;
4853 struct net *net = sock_net(sk);
4856 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4860 if ((PF_INET == sk->sk_family) &&
4861 (AF_INET6 == addr->a.sa.sa_family))
4863 if ((PF_INET6 == sk->sk_family) &&
4864 inet_v6_ipv6only(sk) &&
4865 (AF_INET == addr->a.sa.sa_family))
4867 memcpy(&temp, &addr->a, sizeof(temp));
4868 if (!temp.v4.sin_port)
4869 temp.v4.sin_port = htons(port);
4871 addrlen = sctp_get_pf_specific(sk->sk_family)
4872 ->addr_to_user(sctp_sk(sk), &temp);
4874 if (space_left < addrlen) {
4878 memcpy(to, &temp, addrlen);
4882 space_left -= addrlen;
4883 *bytes_copied += addrlen;
4891 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4892 char __user *optval, int __user *optlen)
4894 struct sctp_bind_addr *bp;
4895 struct sctp_association *asoc;
4897 struct sctp_getaddrs getaddrs;
4898 struct sctp_sockaddr_entry *addr;
4900 union sctp_addr temp;
4901 struct sctp_sock *sp = sctp_sk(sk);
4905 int bytes_copied = 0;
4909 if (len < sizeof(struct sctp_getaddrs))
4912 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4916 * For UDP-style sockets, id specifies the association to query.
4917 * If the id field is set to the value '0' then the locally bound
4918 * addresses are returned without regard to any particular
4921 if (0 == getaddrs.assoc_id) {
4922 bp = &sctp_sk(sk)->ep->base.bind_addr;
4924 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4927 bp = &asoc->base.bind_addr;
4930 to = optval + offsetof(struct sctp_getaddrs, addrs);
4931 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4933 addrs = kmalloc(space_left, GFP_KERNEL);
4937 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4938 * addresses from the global local address list.
4940 if (sctp_list_single_entry(&bp->address_list)) {
4941 addr = list_entry(bp->address_list.next,
4942 struct sctp_sockaddr_entry, list);
4943 if (sctp_is_any(sk, &addr->a)) {
4944 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4945 space_left, &bytes_copied);
4955 /* Protection on the bound address list is not needed since
4956 * in the socket option context we hold a socket lock and
4957 * thus the bound address list can't change.
4959 list_for_each_entry(addr, &bp->address_list, list) {
4960 memcpy(&temp, &addr->a, sizeof(temp));
4961 addrlen = sctp_get_pf_specific(sk->sk_family)
4962 ->addr_to_user(sp, &temp);
4963 if (space_left < addrlen) {
4964 err = -ENOMEM; /*fixme: right error?*/
4967 memcpy(buf, &temp, addrlen);
4969 bytes_copied += addrlen;
4971 space_left -= addrlen;
4975 if (copy_to_user(to, addrs, bytes_copied)) {
4979 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4983 if (put_user(bytes_copied, optlen))
4990 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4992 * Requests that the local SCTP stack use the enclosed peer address as
4993 * the association primary. The enclosed address must be one of the
4994 * association peer's addresses.
4996 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4997 char __user *optval, int __user *optlen)
4999 struct sctp_prim prim;
5000 struct sctp_association *asoc;
5001 struct sctp_sock *sp = sctp_sk(sk);
5003 if (len < sizeof(struct sctp_prim))
5006 len = sizeof(struct sctp_prim);
5008 if (copy_from_user(&prim, optval, len))
5011 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5015 if (!asoc->peer.primary_path)
5018 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5019 asoc->peer.primary_path->af_specific->sockaddr_len);
5021 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5022 (union sctp_addr *)&prim.ssp_addr);
5024 if (put_user(len, optlen))
5026 if (copy_to_user(optval, &prim, len))
5033 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5035 * Requests that the local endpoint set the specified Adaptation Layer
5036 * Indication parameter for all future INIT and INIT-ACK exchanges.
5038 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5039 char __user *optval, int __user *optlen)
5041 struct sctp_setadaptation adaptation;
5043 if (len < sizeof(struct sctp_setadaptation))
5046 len = sizeof(struct sctp_setadaptation);
5048 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5050 if (put_user(len, optlen))
5052 if (copy_to_user(optval, &adaptation, len))
5060 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5062 * Applications that wish to use the sendto() system call may wish to
5063 * specify a default set of parameters that would normally be supplied
5064 * through the inclusion of ancillary data. This socket option allows
5065 * such an application to set the default sctp_sndrcvinfo structure.
5068 * The application that wishes to use this socket option simply passes
5069 * in to this call the sctp_sndrcvinfo structure defined in Section
5070 * 5.2.2) The input parameters accepted by this call include
5071 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5072 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5073 * to this call if the caller is using the UDP model.
5075 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5077 static int sctp_getsockopt_default_send_param(struct sock *sk,
5078 int len, char __user *optval,
5081 struct sctp_sock *sp = sctp_sk(sk);
5082 struct sctp_association *asoc;
5083 struct sctp_sndrcvinfo info;
5085 if (len < sizeof(info))
5090 if (copy_from_user(&info, optval, len))
5093 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5094 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5097 info.sinfo_stream = asoc->default_stream;
5098 info.sinfo_flags = asoc->default_flags;
5099 info.sinfo_ppid = asoc->default_ppid;
5100 info.sinfo_context = asoc->default_context;
5101 info.sinfo_timetolive = asoc->default_timetolive;
5103 info.sinfo_stream = sp->default_stream;
5104 info.sinfo_flags = sp->default_flags;
5105 info.sinfo_ppid = sp->default_ppid;
5106 info.sinfo_context = sp->default_context;
5107 info.sinfo_timetolive = sp->default_timetolive;
5110 if (put_user(len, optlen))
5112 if (copy_to_user(optval, &info, len))
5118 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5119 * (SCTP_DEFAULT_SNDINFO)
5121 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5122 char __user *optval,
5125 struct sctp_sock *sp = sctp_sk(sk);
5126 struct sctp_association *asoc;
5127 struct sctp_sndinfo info;
5129 if (len < sizeof(info))
5134 if (copy_from_user(&info, optval, len))
5137 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5138 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5141 info.snd_sid = asoc->default_stream;
5142 info.snd_flags = asoc->default_flags;
5143 info.snd_ppid = asoc->default_ppid;
5144 info.snd_context = asoc->default_context;
5146 info.snd_sid = sp->default_stream;
5147 info.snd_flags = sp->default_flags;
5148 info.snd_ppid = sp->default_ppid;
5149 info.snd_context = sp->default_context;
5152 if (put_user(len, optlen))
5154 if (copy_to_user(optval, &info, len))
5162 * 7.1.5 SCTP_NODELAY
5164 * Turn on/off any Nagle-like algorithm. This means that packets are
5165 * generally sent as soon as possible and no unnecessary delays are
5166 * introduced, at the cost of more packets in the network. Expects an
5167 * integer boolean flag.
5170 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5171 char __user *optval, int __user *optlen)
5175 if (len < sizeof(int))
5179 val = (sctp_sk(sk)->nodelay == 1);
5180 if (put_user(len, optlen))
5182 if (copy_to_user(optval, &val, len))
5189 * 7.1.1 SCTP_RTOINFO
5191 * The protocol parameters used to initialize and bound retransmission
5192 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5193 * and modify these parameters.
5194 * All parameters are time values, in milliseconds. A value of 0, when
5195 * modifying the parameters, indicates that the current value should not
5199 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5200 char __user *optval,
5201 int __user *optlen) {
5202 struct sctp_rtoinfo rtoinfo;
5203 struct sctp_association *asoc;
5205 if (len < sizeof (struct sctp_rtoinfo))
5208 len = sizeof(struct sctp_rtoinfo);
5210 if (copy_from_user(&rtoinfo, optval, len))
5213 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5215 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5218 /* Values corresponding to the specific association. */
5220 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5221 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5222 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5224 /* Values corresponding to the endpoint. */
5225 struct sctp_sock *sp = sctp_sk(sk);
5227 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5228 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5229 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5232 if (put_user(len, optlen))
5235 if (copy_to_user(optval, &rtoinfo, len))
5243 * 7.1.2 SCTP_ASSOCINFO
5245 * This option is used to tune the maximum retransmission attempts
5246 * of the association.
5247 * Returns an error if the new association retransmission value is
5248 * greater than the sum of the retransmission value of the peer.
5249 * See [SCTP] for more information.
5252 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5253 char __user *optval,
5257 struct sctp_assocparams assocparams;
5258 struct sctp_association *asoc;
5259 struct list_head *pos;
5262 if (len < sizeof (struct sctp_assocparams))
5265 len = sizeof(struct sctp_assocparams);
5267 if (copy_from_user(&assocparams, optval, len))
5270 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5272 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5275 /* Values correspoinding to the specific association */
5277 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5278 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5279 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5280 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5282 list_for_each(pos, &asoc->peer.transport_addr_list) {
5286 assocparams.sasoc_number_peer_destinations = cnt;
5288 /* Values corresponding to the endpoint */
5289 struct sctp_sock *sp = sctp_sk(sk);
5291 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5292 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5293 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5294 assocparams.sasoc_cookie_life =
5295 sp->assocparams.sasoc_cookie_life;
5296 assocparams.sasoc_number_peer_destinations =
5298 sasoc_number_peer_destinations;
5301 if (put_user(len, optlen))
5304 if (copy_to_user(optval, &assocparams, len))
5311 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5313 * This socket option is a boolean flag which turns on or off mapped V4
5314 * addresses. If this option is turned on and the socket is type
5315 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5316 * If this option is turned off, then no mapping will be done of V4
5317 * addresses and a user will receive both PF_INET6 and PF_INET type
5318 * addresses on the socket.
5320 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5321 char __user *optval, int __user *optlen)
5324 struct sctp_sock *sp = sctp_sk(sk);
5326 if (len < sizeof(int))
5331 if (put_user(len, optlen))
5333 if (copy_to_user(optval, &val, len))
5340 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5341 * (chapter and verse is quoted at sctp_setsockopt_context())
5343 static int sctp_getsockopt_context(struct sock *sk, int len,
5344 char __user *optval, int __user *optlen)
5346 struct sctp_assoc_value params;
5347 struct sctp_sock *sp;
5348 struct sctp_association *asoc;
5350 if (len < sizeof(struct sctp_assoc_value))
5353 len = sizeof(struct sctp_assoc_value);
5355 if (copy_from_user(¶ms, optval, len))
5360 if (params.assoc_id != 0) {
5361 asoc = sctp_id2assoc(sk, params.assoc_id);
5364 params.assoc_value = asoc->default_rcv_context;
5366 params.assoc_value = sp->default_rcv_context;
5369 if (put_user(len, optlen))
5371 if (copy_to_user(optval, ¶ms, len))
5378 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5379 * This option will get or set the maximum size to put in any outgoing
5380 * SCTP DATA chunk. If a message is larger than this size it will be
5381 * fragmented by SCTP into the specified size. Note that the underlying
5382 * SCTP implementation may fragment into smaller sized chunks when the
5383 * PMTU of the underlying association is smaller than the value set by
5384 * the user. The default value for this option is '0' which indicates
5385 * the user is NOT limiting fragmentation and only the PMTU will effect
5386 * SCTP's choice of DATA chunk size. Note also that values set larger
5387 * than the maximum size of an IP datagram will effectively let SCTP
5388 * control fragmentation (i.e. the same as setting this option to 0).
5390 * The following structure is used to access and modify this parameter:
5392 * struct sctp_assoc_value {
5393 * sctp_assoc_t assoc_id;
5394 * uint32_t assoc_value;
5397 * assoc_id: This parameter is ignored for one-to-one style sockets.
5398 * For one-to-many style sockets this parameter indicates which
5399 * association the user is performing an action upon. Note that if
5400 * this field's value is zero then the endpoints default value is
5401 * changed (effecting future associations only).
5402 * assoc_value: This parameter specifies the maximum size in bytes.
5404 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5405 char __user *optval, int __user *optlen)
5407 struct sctp_assoc_value params;
5408 struct sctp_association *asoc;
5410 if (len == sizeof(int)) {
5411 pr_warn_ratelimited(DEPRECATED
5413 "Use of int in maxseg socket option.\n"
5414 "Use struct sctp_assoc_value instead\n",
5415 current->comm, task_pid_nr(current));
5416 params.assoc_id = 0;
5417 } else if (len >= sizeof(struct sctp_assoc_value)) {
5418 len = sizeof(struct sctp_assoc_value);
5419 if (copy_from_user(¶ms, optval, sizeof(params)))
5424 asoc = sctp_id2assoc(sk, params.assoc_id);
5425 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5429 params.assoc_value = asoc->frag_point;
5431 params.assoc_value = sctp_sk(sk)->user_frag;
5433 if (put_user(len, optlen))
5435 if (len == sizeof(int)) {
5436 if (copy_to_user(optval, ¶ms.assoc_value, len))
5439 if (copy_to_user(optval, ¶ms, len))
5447 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5448 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5450 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5451 char __user *optval, int __user *optlen)
5455 if (len < sizeof(int))
5460 val = sctp_sk(sk)->frag_interleave;
5461 if (put_user(len, optlen))
5463 if (copy_to_user(optval, &val, len))
5470 * 7.1.25. Set or Get the sctp partial delivery point
5471 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5473 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5474 char __user *optval,
5479 if (len < sizeof(u32))
5484 val = sctp_sk(sk)->pd_point;
5485 if (put_user(len, optlen))
5487 if (copy_to_user(optval, &val, len))
5494 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5495 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5497 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5498 char __user *optval,
5501 struct sctp_assoc_value params;
5502 struct sctp_sock *sp;
5503 struct sctp_association *asoc;
5505 if (len == sizeof(int)) {
5506 pr_warn_ratelimited(DEPRECATED
5508 "Use of int in max_burst socket option.\n"
5509 "Use struct sctp_assoc_value instead\n",
5510 current->comm, task_pid_nr(current));
5511 params.assoc_id = 0;
5512 } else if (len >= sizeof(struct sctp_assoc_value)) {
5513 len = sizeof(struct sctp_assoc_value);
5514 if (copy_from_user(¶ms, optval, len))
5521 if (params.assoc_id != 0) {
5522 asoc = sctp_id2assoc(sk, params.assoc_id);
5525 params.assoc_value = asoc->max_burst;
5527 params.assoc_value = sp->max_burst;
5529 if (len == sizeof(int)) {
5530 if (copy_to_user(optval, ¶ms.assoc_value, len))
5533 if (copy_to_user(optval, ¶ms, len))
5541 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5542 char __user *optval, int __user *optlen)
5544 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5545 struct sctp_hmacalgo __user *p = (void __user *)optval;
5546 struct sctp_hmac_algo_param *hmacs;
5550 if (!ep->auth_enable)
5553 hmacs = ep->auth_hmacs_list;
5554 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5556 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5559 len = sizeof(struct sctp_hmacalgo) + data_len;
5560 num_idents = data_len / sizeof(u16);
5562 if (put_user(len, optlen))
5564 if (put_user(num_idents, &p->shmac_num_idents))
5566 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5571 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5572 char __user *optval, int __user *optlen)
5574 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5575 struct sctp_authkeyid val;
5576 struct sctp_association *asoc;
5578 if (!ep->auth_enable)
5581 if (len < sizeof(struct sctp_authkeyid))
5583 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5586 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5587 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5591 val.scact_keynumber = asoc->active_key_id;
5593 val.scact_keynumber = ep->active_key_id;
5595 len = sizeof(struct sctp_authkeyid);
5596 if (put_user(len, optlen))
5598 if (copy_to_user(optval, &val, len))
5604 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5605 char __user *optval, int __user *optlen)
5607 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5608 struct sctp_authchunks __user *p = (void __user *)optval;
5609 struct sctp_authchunks val;
5610 struct sctp_association *asoc;
5611 struct sctp_chunks_param *ch;
5615 if (!ep->auth_enable)
5618 if (len < sizeof(struct sctp_authchunks))
5621 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5624 to = p->gauth_chunks;
5625 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5629 ch = asoc->peer.peer_chunks;
5633 /* See if the user provided enough room for all the data */
5634 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5635 if (len < num_chunks)
5638 if (copy_to_user(to, ch->chunks, num_chunks))
5641 len = sizeof(struct sctp_authchunks) + num_chunks;
5642 if (put_user(len, optlen))
5644 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5649 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5650 char __user *optval, int __user *optlen)
5652 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5653 struct sctp_authchunks __user *p = (void __user *)optval;
5654 struct sctp_authchunks val;
5655 struct sctp_association *asoc;
5656 struct sctp_chunks_param *ch;
5660 if (!ep->auth_enable)
5663 if (len < sizeof(struct sctp_authchunks))
5666 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5669 to = p->gauth_chunks;
5670 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5671 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5675 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5677 ch = ep->auth_chunk_list;
5682 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5683 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5686 if (copy_to_user(to, ch->chunks, num_chunks))
5689 len = sizeof(struct sctp_authchunks) + num_chunks;
5690 if (put_user(len, optlen))
5692 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5699 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5700 * This option gets the current number of associations that are attached
5701 * to a one-to-many style socket. The option value is an uint32_t.
5703 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5704 char __user *optval, int __user *optlen)
5706 struct sctp_sock *sp = sctp_sk(sk);
5707 struct sctp_association *asoc;
5710 if (sctp_style(sk, TCP))
5713 if (len < sizeof(u32))
5718 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5722 if (put_user(len, optlen))
5724 if (copy_to_user(optval, &val, len))
5731 * 8.1.23 SCTP_AUTO_ASCONF
5732 * See the corresponding setsockopt entry as description
5734 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5735 char __user *optval, int __user *optlen)
5739 if (len < sizeof(int))
5743 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5745 if (put_user(len, optlen))
5747 if (copy_to_user(optval, &val, len))
5753 * 8.2.6. Get the Current Identifiers of Associations
5754 * (SCTP_GET_ASSOC_ID_LIST)
5756 * This option gets the current list of SCTP association identifiers of
5757 * the SCTP associations handled by a one-to-many style socket.
5759 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5760 char __user *optval, int __user *optlen)
5762 struct sctp_sock *sp = sctp_sk(sk);
5763 struct sctp_association *asoc;
5764 struct sctp_assoc_ids *ids;
5767 if (sctp_style(sk, TCP))
5770 if (len < sizeof(struct sctp_assoc_ids))
5773 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5777 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5780 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5782 ids = kmalloc(len, GFP_KERNEL);
5786 ids->gaids_number_of_ids = num;
5788 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5789 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5792 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5802 * SCTP_PEER_ADDR_THLDS
5804 * This option allows us to fetch the partially failed threshold for one or all
5805 * transports in an association. See Section 6.1 of:
5806 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5808 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5809 char __user *optval,
5813 struct sctp_paddrthlds val;
5814 struct sctp_transport *trans;
5815 struct sctp_association *asoc;
5817 if (len < sizeof(struct sctp_paddrthlds))
5819 len = sizeof(struct sctp_paddrthlds);
5820 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5823 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5824 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5828 val.spt_pathpfthld = asoc->pf_retrans;
5829 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5831 trans = sctp_addr_id2transport(sk, &val.spt_address,
5836 val.spt_pathmaxrxt = trans->pathmaxrxt;
5837 val.spt_pathpfthld = trans->pf_retrans;
5840 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5847 * SCTP_GET_ASSOC_STATS
5849 * This option retrieves local per endpoint statistics. It is modeled
5850 * after OpenSolaris' implementation
5852 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5853 char __user *optval,
5856 struct sctp_assoc_stats sas;
5857 struct sctp_association *asoc = NULL;
5859 /* User must provide at least the assoc id */
5860 if (len < sizeof(sctp_assoc_t))
5863 /* Allow the struct to grow and fill in as much as possible */
5864 len = min_t(size_t, len, sizeof(sas));
5866 if (copy_from_user(&sas, optval, len))
5869 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5873 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5874 sas.sas_gapcnt = asoc->stats.gapcnt;
5875 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5876 sas.sas_osacks = asoc->stats.osacks;
5877 sas.sas_isacks = asoc->stats.isacks;
5878 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5879 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5880 sas.sas_oodchunks = asoc->stats.oodchunks;
5881 sas.sas_iodchunks = asoc->stats.iodchunks;
5882 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5883 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5884 sas.sas_idupchunks = asoc->stats.idupchunks;
5885 sas.sas_opackets = asoc->stats.opackets;
5886 sas.sas_ipackets = asoc->stats.ipackets;
5888 /* New high max rto observed, will return 0 if not a single
5889 * RTO update took place. obs_rto_ipaddr will be bogus
5892 sas.sas_maxrto = asoc->stats.max_obs_rto;
5893 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5894 sizeof(struct sockaddr_storage));
5896 /* Mark beginning of a new observation period */
5897 asoc->stats.max_obs_rto = asoc->rto_min;
5899 if (put_user(len, optlen))
5902 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5904 if (copy_to_user(optval, &sas, len))
5910 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5911 char __user *optval,
5916 if (len < sizeof(int))
5920 if (sctp_sk(sk)->recvrcvinfo)
5922 if (put_user(len, optlen))
5924 if (copy_to_user(optval, &val, len))
5930 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5931 char __user *optval,
5936 if (len < sizeof(int))
5940 if (sctp_sk(sk)->recvnxtinfo)
5942 if (put_user(len, optlen))
5944 if (copy_to_user(optval, &val, len))
5950 static int sctp_getsockopt(struct sock *sk, int level, int optname,
5951 char __user *optval, int __user *optlen)
5956 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
5958 /* I can hardly begin to describe how wrong this is. This is
5959 * so broken as to be worse than useless. The API draft
5960 * REALLY is NOT helpful here... I am not convinced that the
5961 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5962 * are at all well-founded.
5964 if (level != SOL_SCTP) {
5965 struct sctp_af *af = sctp_sk(sk)->pf->af;
5967 retval = af->getsockopt(sk, level, optname, optval, optlen);
5971 if (get_user(len, optlen))
5978 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5980 case SCTP_DISABLE_FRAGMENTS:
5981 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5985 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5987 case SCTP_AUTOCLOSE:
5988 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5990 case SCTP_SOCKOPT_PEELOFF:
5991 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5993 case SCTP_PEER_ADDR_PARAMS:
5994 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5997 case SCTP_DELAYED_SACK:
5998 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6002 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6004 case SCTP_GET_PEER_ADDRS:
6005 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6008 case SCTP_GET_LOCAL_ADDRS:
6009 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6012 case SCTP_SOCKOPT_CONNECTX3:
6013 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6015 case SCTP_DEFAULT_SEND_PARAM:
6016 retval = sctp_getsockopt_default_send_param(sk, len,
6019 case SCTP_DEFAULT_SNDINFO:
6020 retval = sctp_getsockopt_default_sndinfo(sk, len,
6023 case SCTP_PRIMARY_ADDR:
6024 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6027 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6030 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6032 case SCTP_ASSOCINFO:
6033 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6035 case SCTP_I_WANT_MAPPED_V4_ADDR:
6036 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6039 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6041 case SCTP_GET_PEER_ADDR_INFO:
6042 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6045 case SCTP_ADAPTATION_LAYER:
6046 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6050 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6052 case SCTP_FRAGMENT_INTERLEAVE:
6053 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6056 case SCTP_PARTIAL_DELIVERY_POINT:
6057 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6060 case SCTP_MAX_BURST:
6061 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6064 case SCTP_AUTH_CHUNK:
6065 case SCTP_AUTH_DELETE_KEY:
6066 retval = -EOPNOTSUPP;
6068 case SCTP_HMAC_IDENT:
6069 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6071 case SCTP_AUTH_ACTIVE_KEY:
6072 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6074 case SCTP_PEER_AUTH_CHUNKS:
6075 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6078 case SCTP_LOCAL_AUTH_CHUNKS:
6079 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6082 case SCTP_GET_ASSOC_NUMBER:
6083 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6085 case SCTP_GET_ASSOC_ID_LIST:
6086 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6088 case SCTP_AUTO_ASCONF:
6089 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6091 case SCTP_PEER_ADDR_THLDS:
6092 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6094 case SCTP_GET_ASSOC_STATS:
6095 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6097 case SCTP_RECVRCVINFO:
6098 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6100 case SCTP_RECVNXTINFO:
6101 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6104 retval = -ENOPROTOOPT;
6112 static void sctp_hash(struct sock *sk)
6117 static void sctp_unhash(struct sock *sk)
6122 /* Check if port is acceptable. Possibly find first available port.
6124 * The port hash table (contained in the 'global' SCTP protocol storage
6125 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6126 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6127 * list (the list number is the port number hashed out, so as you
6128 * would expect from a hash function, all the ports in a given list have
6129 * such a number that hashes out to the same list number; you were
6130 * expecting that, right?); so each list has a set of ports, with a
6131 * link to the socket (struct sock) that uses it, the port number and
6132 * a fastreuse flag (FIXME: NPI ipg).
6134 static struct sctp_bind_bucket *sctp_bucket_create(
6135 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6137 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6139 struct sctp_bind_hashbucket *head; /* hash list */
6140 struct sctp_bind_bucket *pp;
6141 unsigned short snum;
6144 snum = ntohs(addr->v4.sin_port);
6146 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6151 /* Search for an available port. */
6152 int low, high, remaining, index;
6154 struct net *net = sock_net(sk);
6156 inet_get_local_port_range(net, &low, &high);
6157 remaining = (high - low) + 1;
6158 rover = prandom_u32() % remaining + low;
6162 if ((rover < low) || (rover > high))
6164 if (inet_is_local_reserved_port(net, rover))
6166 index = sctp_phashfn(sock_net(sk), rover);
6167 head = &sctp_port_hashtable[index];
6168 spin_lock(&head->lock);
6169 sctp_for_each_hentry(pp, &head->chain)
6170 if ((pp->port == rover) &&
6171 net_eq(sock_net(sk), pp->net))
6175 spin_unlock(&head->lock);
6176 } while (--remaining > 0);
6178 /* Exhausted local port range during search? */
6183 /* OK, here is the one we will use. HEAD (the port
6184 * hash table list entry) is non-NULL and we hold it's
6189 /* We are given an specific port number; we verify
6190 * that it is not being used. If it is used, we will
6191 * exahust the search in the hash list corresponding
6192 * to the port number (snum) - we detect that with the
6193 * port iterator, pp being NULL.
6195 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6196 spin_lock(&head->lock);
6197 sctp_for_each_hentry(pp, &head->chain) {
6198 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6205 if (!hlist_empty(&pp->owner)) {
6206 /* We had a port hash table hit - there is an
6207 * available port (pp != NULL) and it is being
6208 * used by other socket (pp->owner not empty); that other
6209 * socket is going to be sk2.
6211 int reuse = sk->sk_reuse;
6214 pr_debug("%s: found a possible match\n", __func__);
6216 if (pp->fastreuse && sk->sk_reuse &&
6217 sk->sk_state != SCTP_SS_LISTENING)
6220 /* Run through the list of sockets bound to the port
6221 * (pp->port) [via the pointers bind_next and
6222 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6223 * we get the endpoint they describe and run through
6224 * the endpoint's list of IP (v4 or v6) addresses,
6225 * comparing each of the addresses with the address of
6226 * the socket sk. If we find a match, then that means
6227 * that this port/socket (sk) combination are already
6230 sk_for_each_bound(sk2, &pp->owner) {
6231 struct sctp_endpoint *ep2;
6232 ep2 = sctp_sk(sk2)->ep;
6235 (reuse && sk2->sk_reuse &&
6236 sk2->sk_state != SCTP_SS_LISTENING))
6239 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6240 sctp_sk(sk2), sctp_sk(sk))) {
6246 pr_debug("%s: found a match\n", __func__);
6249 /* If there was a hash table miss, create a new port. */
6251 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6254 /* In either case (hit or miss), make sure fastreuse is 1 only
6255 * if sk->sk_reuse is too (that is, if the caller requested
6256 * SO_REUSEADDR on this socket -sk-).
6258 if (hlist_empty(&pp->owner)) {
6259 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6263 } else if (pp->fastreuse &&
6264 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6267 /* We are set, so fill up all the data in the hash table
6268 * entry, tie the socket list information with the rest of the
6269 * sockets FIXME: Blurry, NPI (ipg).
6272 if (!sctp_sk(sk)->bind_hash) {
6273 inet_sk(sk)->inet_num = snum;
6274 sk_add_bind_node(sk, &pp->owner);
6275 sctp_sk(sk)->bind_hash = pp;
6280 spin_unlock(&head->lock);
6287 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6288 * port is requested.
6290 static int sctp_get_port(struct sock *sk, unsigned short snum)
6292 union sctp_addr addr;
6293 struct sctp_af *af = sctp_sk(sk)->pf->af;
6295 /* Set up a dummy address struct from the sk. */
6296 af->from_sk(&addr, sk);
6297 addr.v4.sin_port = htons(snum);
6299 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6300 return !!sctp_get_port_local(sk, &addr);
6304 * Move a socket to LISTENING state.
6306 static int sctp_listen_start(struct sock *sk, int backlog)
6308 struct sctp_sock *sp = sctp_sk(sk);
6309 struct sctp_endpoint *ep = sp->ep;
6310 struct crypto_hash *tfm = NULL;
6313 /* Allocate HMAC for generating cookie. */
6314 if (!sp->hmac && sp->sctp_hmac_alg) {
6315 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6316 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6318 net_info_ratelimited("failed to load transform for %s: %ld\n",
6319 sp->sctp_hmac_alg, PTR_ERR(tfm));
6322 sctp_sk(sk)->hmac = tfm;
6326 * If a bind() or sctp_bindx() is not called prior to a listen()
6327 * call that allows new associations to be accepted, the system
6328 * picks an ephemeral port and will choose an address set equivalent
6329 * to binding with a wildcard address.
6331 * This is not currently spelled out in the SCTP sockets
6332 * extensions draft, but follows the practice as seen in TCP
6336 sk->sk_state = SCTP_SS_LISTENING;
6337 if (!ep->base.bind_addr.port) {
6338 if (sctp_autobind(sk))
6341 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6342 sk->sk_state = SCTP_SS_CLOSED;
6347 sk->sk_max_ack_backlog = backlog;
6348 sctp_hash_endpoint(ep);
6353 * 4.1.3 / 5.1.3 listen()
6355 * By default, new associations are not accepted for UDP style sockets.
6356 * An application uses listen() to mark a socket as being able to
6357 * accept new associations.
6359 * On TCP style sockets, applications use listen() to ready the SCTP
6360 * endpoint for accepting inbound associations.
6362 * On both types of endpoints a backlog of '0' disables listening.
6364 * Move a socket to LISTENING state.
6366 int sctp_inet_listen(struct socket *sock, int backlog)
6368 struct sock *sk = sock->sk;
6369 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6372 if (unlikely(backlog < 0))
6377 /* Peeled-off sockets are not allowed to listen(). */
6378 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6381 if (sock->state != SS_UNCONNECTED)
6384 /* If backlog is zero, disable listening. */
6386 if (sctp_sstate(sk, CLOSED))
6390 sctp_unhash_endpoint(ep);
6391 sk->sk_state = SCTP_SS_CLOSED;
6393 sctp_sk(sk)->bind_hash->fastreuse = 1;
6397 /* If we are already listening, just update the backlog */
6398 if (sctp_sstate(sk, LISTENING))
6399 sk->sk_max_ack_backlog = backlog;
6401 err = sctp_listen_start(sk, backlog);
6413 * This function is done by modeling the current datagram_poll() and the
6414 * tcp_poll(). Note that, based on these implementations, we don't
6415 * lock the socket in this function, even though it seems that,
6416 * ideally, locking or some other mechanisms can be used to ensure
6417 * the integrity of the counters (sndbuf and wmem_alloc) used
6418 * in this place. We assume that we don't need locks either until proven
6421 * Another thing to note is that we include the Async I/O support
6422 * here, again, by modeling the current TCP/UDP code. We don't have
6423 * a good way to test with it yet.
6425 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6427 struct sock *sk = sock->sk;
6428 struct sctp_sock *sp = sctp_sk(sk);
6431 poll_wait(file, sk_sleep(sk), wait);
6433 /* A TCP-style listening socket becomes readable when the accept queue
6436 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6437 return (!list_empty(&sp->ep->asocs)) ?
6438 (POLLIN | POLLRDNORM) : 0;
6442 /* Is there any exceptional events? */
6443 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6445 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6446 if (sk->sk_shutdown & RCV_SHUTDOWN)
6447 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6448 if (sk->sk_shutdown == SHUTDOWN_MASK)
6451 /* Is it readable? Reconsider this code with TCP-style support. */
6452 if (!skb_queue_empty(&sk->sk_receive_queue))
6453 mask |= POLLIN | POLLRDNORM;
6455 /* The association is either gone or not ready. */
6456 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6459 /* Is it writable? */
6460 if (sctp_writeable(sk)) {
6461 mask |= POLLOUT | POLLWRNORM;
6463 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6465 * Since the socket is not locked, the buffer
6466 * might be made available after the writeable check and
6467 * before the bit is set. This could cause a lost I/O
6468 * signal. tcp_poll() has a race breaker for this race
6469 * condition. Based on their implementation, we put
6470 * in the following code to cover it as well.
6472 if (sctp_writeable(sk))
6473 mask |= POLLOUT | POLLWRNORM;
6478 /********************************************************************
6479 * 2nd Level Abstractions
6480 ********************************************************************/
6482 static struct sctp_bind_bucket *sctp_bucket_create(
6483 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6485 struct sctp_bind_bucket *pp;
6487 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6489 SCTP_DBG_OBJCNT_INC(bind_bucket);
6492 INIT_HLIST_HEAD(&pp->owner);
6494 hlist_add_head(&pp->node, &head->chain);
6499 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6500 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6502 if (pp && hlist_empty(&pp->owner)) {
6503 __hlist_del(&pp->node);
6504 kmem_cache_free(sctp_bucket_cachep, pp);
6505 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6509 /* Release this socket's reference to a local port. */
6510 static inline void __sctp_put_port(struct sock *sk)
6512 struct sctp_bind_hashbucket *head =
6513 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6514 inet_sk(sk)->inet_num)];
6515 struct sctp_bind_bucket *pp;
6517 spin_lock(&head->lock);
6518 pp = sctp_sk(sk)->bind_hash;
6519 __sk_del_bind_node(sk);
6520 sctp_sk(sk)->bind_hash = NULL;
6521 inet_sk(sk)->inet_num = 0;
6522 sctp_bucket_destroy(pp);
6523 spin_unlock(&head->lock);
6526 void sctp_put_port(struct sock *sk)
6529 __sctp_put_port(sk);
6534 * The system picks an ephemeral port and choose an address set equivalent
6535 * to binding with a wildcard address.
6536 * One of those addresses will be the primary address for the association.
6537 * This automatically enables the multihoming capability of SCTP.
6539 static int sctp_autobind(struct sock *sk)
6541 union sctp_addr autoaddr;
6545 /* Initialize a local sockaddr structure to INADDR_ANY. */
6546 af = sctp_sk(sk)->pf->af;
6548 port = htons(inet_sk(sk)->inet_num);
6549 af->inaddr_any(&autoaddr, port);
6551 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6554 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6557 * 4.2 The cmsghdr Structure *
6559 * When ancillary data is sent or received, any number of ancillary data
6560 * objects can be specified by the msg_control and msg_controllen members of
6561 * the msghdr structure, because each object is preceded by
6562 * a cmsghdr structure defining the object's length (the cmsg_len member).
6563 * Historically Berkeley-derived implementations have passed only one object
6564 * at a time, but this API allows multiple objects to be
6565 * passed in a single call to sendmsg() or recvmsg(). The following example
6566 * shows two ancillary data objects in a control buffer.
6568 * |<--------------------------- msg_controllen -------------------------->|
6571 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6573 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6576 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6578 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6581 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6582 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6584 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6586 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6593 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6595 struct cmsghdr *cmsg;
6596 struct msghdr *my_msg = (struct msghdr *)msg;
6598 for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
6599 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6600 if (!CMSG_OK(my_msg, cmsg))
6603 /* Should we parse this header or ignore? */
6604 if (cmsg->cmsg_level != IPPROTO_SCTP)
6607 /* Strictly check lengths following example in SCM code. */
6608 switch (cmsg->cmsg_type) {
6610 /* SCTP Socket API Extension
6611 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6613 * This cmsghdr structure provides information for
6614 * initializing new SCTP associations with sendmsg().
6615 * The SCTP_INITMSG socket option uses this same data
6616 * structure. This structure is not used for
6619 * cmsg_level cmsg_type cmsg_data[]
6620 * ------------ ------------ ----------------------
6621 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6623 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6626 cmsgs->init = CMSG_DATA(cmsg);
6630 /* SCTP Socket API Extension
6631 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6633 * This cmsghdr structure specifies SCTP options for
6634 * sendmsg() and describes SCTP header information
6635 * about a received message through recvmsg().
6637 * cmsg_level cmsg_type cmsg_data[]
6638 * ------------ ------------ ----------------------
6639 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6641 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6644 cmsgs->srinfo = CMSG_DATA(cmsg);
6646 if (cmsgs->srinfo->sinfo_flags &
6647 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6648 SCTP_ABORT | SCTP_EOF))
6653 /* SCTP Socket API Extension
6654 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6656 * This cmsghdr structure specifies SCTP options for
6657 * sendmsg(). This structure and SCTP_RCVINFO replaces
6658 * SCTP_SNDRCV which has been deprecated.
6660 * cmsg_level cmsg_type cmsg_data[]
6661 * ------------ ------------ ---------------------
6662 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6664 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6667 cmsgs->sinfo = CMSG_DATA(cmsg);
6669 if (cmsgs->sinfo->snd_flags &
6670 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6671 SCTP_ABORT | SCTP_EOF))
6683 * Wait for a packet..
6684 * Note: This function is the same function as in core/datagram.c
6685 * with a few modifications to make lksctp work.
6687 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6692 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6694 /* Socket errors? */
6695 error = sock_error(sk);
6699 if (!skb_queue_empty(&sk->sk_receive_queue))
6702 /* Socket shut down? */
6703 if (sk->sk_shutdown & RCV_SHUTDOWN)
6706 /* Sequenced packets can come disconnected. If so we report the
6711 /* Is there a good reason to think that we may receive some data? */
6712 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6715 /* Handle signals. */
6716 if (signal_pending(current))
6719 /* Let another process have a go. Since we are going to sleep
6720 * anyway. Note: This may cause odd behaviors if the message
6721 * does not fit in the user's buffer, but this seems to be the
6722 * only way to honor MSG_DONTWAIT realistically.
6725 *timeo_p = schedule_timeout(*timeo_p);
6729 finish_wait(sk_sleep(sk), &wait);
6733 error = sock_intr_errno(*timeo_p);
6736 finish_wait(sk_sleep(sk), &wait);
6741 /* Receive a datagram.
6742 * Note: This is pretty much the same routine as in core/datagram.c
6743 * with a few changes to make lksctp work.
6745 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6746 int noblock, int *err)
6749 struct sk_buff *skb;
6752 timeo = sock_rcvtimeo(sk, noblock);
6754 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6755 MAX_SCHEDULE_TIMEOUT);
6758 /* Again only user level code calls this function,
6759 * so nothing interrupt level
6760 * will suddenly eat the receive_queue.
6762 * Look at current nfs client by the way...
6763 * However, this function was correct in any case. 8)
6765 if (flags & MSG_PEEK) {
6766 spin_lock_bh(&sk->sk_receive_queue.lock);
6767 skb = skb_peek(&sk->sk_receive_queue);
6769 atomic_inc(&skb->users);
6770 spin_unlock_bh(&sk->sk_receive_queue.lock);
6772 skb = skb_dequeue(&sk->sk_receive_queue);
6778 /* Caller is allowed not to check sk->sk_err before calling. */
6779 error = sock_error(sk);
6783 if (sk->sk_shutdown & RCV_SHUTDOWN)
6786 if (sk_can_busy_loop(sk) &&
6787 sk_busy_loop(sk, noblock))
6790 /* User doesn't want to wait. */
6794 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6803 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6804 static void __sctp_write_space(struct sctp_association *asoc)
6806 struct sock *sk = asoc->base.sk;
6807 struct socket *sock = sk->sk_socket;
6809 if ((sctp_wspace(asoc) > 0) && sock) {
6810 if (waitqueue_active(&asoc->wait))
6811 wake_up_interruptible(&asoc->wait);
6813 if (sctp_writeable(sk)) {
6814 wait_queue_head_t *wq = sk_sleep(sk);
6816 if (wq && waitqueue_active(wq))
6817 wake_up_interruptible(wq);
6819 /* Note that we try to include the Async I/O support
6820 * here by modeling from the current TCP/UDP code.
6821 * We have not tested with it yet.
6823 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6824 sock_wake_async(sock,
6825 SOCK_WAKE_SPACE, POLL_OUT);
6830 static void sctp_wake_up_waiters(struct sock *sk,
6831 struct sctp_association *asoc)
6833 struct sctp_association *tmp = asoc;
6835 /* We do accounting for the sndbuf space per association,
6836 * so we only need to wake our own association.
6838 if (asoc->ep->sndbuf_policy)
6839 return __sctp_write_space(asoc);
6841 /* If association goes down and is just flushing its
6842 * outq, then just normally notify others.
6844 if (asoc->base.dead)
6845 return sctp_write_space(sk);
6847 /* Accounting for the sndbuf space is per socket, so we
6848 * need to wake up others, try to be fair and in case of
6849 * other associations, let them have a go first instead
6850 * of just doing a sctp_write_space() call.
6852 * Note that we reach sctp_wake_up_waiters() only when
6853 * associations free up queued chunks, thus we are under
6854 * lock and the list of associations on a socket is
6855 * guaranteed not to change.
6857 for (tmp = list_next_entry(tmp, asocs); 1;
6858 tmp = list_next_entry(tmp, asocs)) {
6859 /* Manually skip the head element. */
6860 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6862 /* Wake up association. */
6863 __sctp_write_space(tmp);
6864 /* We've reached the end. */
6870 /* Do accounting for the sndbuf space.
6871 * Decrement the used sndbuf space of the corresponding association by the
6872 * data size which was just transmitted(freed).
6874 static void sctp_wfree(struct sk_buff *skb)
6876 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
6877 struct sctp_association *asoc = chunk->asoc;
6878 struct sock *sk = asoc->base.sk;
6880 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6881 sizeof(struct sk_buff) +
6882 sizeof(struct sctp_chunk);
6884 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6887 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6889 sk->sk_wmem_queued -= skb->truesize;
6890 sk_mem_uncharge(sk, skb->truesize);
6893 sctp_wake_up_waiters(sk, asoc);
6895 sctp_association_put(asoc);
6898 /* Do accounting for the receive space on the socket.
6899 * Accounting for the association is done in ulpevent.c
6900 * We set this as a destructor for the cloned data skbs so that
6901 * accounting is done at the correct time.
6903 void sctp_sock_rfree(struct sk_buff *skb)
6905 struct sock *sk = skb->sk;
6906 struct sctp_ulpevent *event = sctp_skb2event(skb);
6908 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6911 * Mimic the behavior of sock_rfree
6913 sk_mem_uncharge(sk, event->rmem_len);
6917 /* Helper function to wait for space in the sndbuf. */
6918 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6921 struct sock *sk = asoc->base.sk;
6923 long current_timeo = *timeo_p;
6926 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6929 /* Increment the association's refcnt. */
6930 sctp_association_hold(asoc);
6932 /* Wait on the association specific sndbuf space. */
6934 prepare_to_wait_exclusive(&asoc->wait, &wait,
6935 TASK_INTERRUPTIBLE);
6938 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6941 if (signal_pending(current))
6942 goto do_interrupted;
6943 if (msg_len <= sctp_wspace(asoc))
6946 /* Let another process have a go. Since we are going
6950 current_timeo = schedule_timeout(current_timeo);
6951 BUG_ON(sk != asoc->base.sk);
6954 *timeo_p = current_timeo;
6958 finish_wait(&asoc->wait, &wait);
6960 /* Release the association's refcnt. */
6961 sctp_association_put(asoc);
6970 err = sock_intr_errno(*timeo_p);
6978 void sctp_data_ready(struct sock *sk)
6980 struct socket_wq *wq;
6983 wq = rcu_dereference(sk->sk_wq);
6984 if (wq_has_sleeper(wq))
6985 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6986 POLLRDNORM | POLLRDBAND);
6987 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6991 /* If socket sndbuf has changed, wake up all per association waiters. */
6992 void sctp_write_space(struct sock *sk)
6994 struct sctp_association *asoc;
6996 /* Wake up the tasks in each wait queue. */
6997 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6998 __sctp_write_space(asoc);
7002 /* Is there any sndbuf space available on the socket?
7004 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7005 * associations on the same socket. For a UDP-style socket with
7006 * multiple associations, it is possible for it to be "unwriteable"
7007 * prematurely. I assume that this is acceptable because
7008 * a premature "unwriteable" is better than an accidental "writeable" which
7009 * would cause an unwanted block under certain circumstances. For the 1-1
7010 * UDP-style sockets or TCP-style sockets, this code should work.
7013 static int sctp_writeable(struct sock *sk)
7017 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7023 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7024 * returns immediately with EINPROGRESS.
7026 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7028 struct sock *sk = asoc->base.sk;
7030 long current_timeo = *timeo_p;
7033 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7035 /* Increment the association's refcnt. */
7036 sctp_association_hold(asoc);
7039 prepare_to_wait_exclusive(&asoc->wait, &wait,
7040 TASK_INTERRUPTIBLE);
7043 if (sk->sk_shutdown & RCV_SHUTDOWN)
7045 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7048 if (signal_pending(current))
7049 goto do_interrupted;
7051 if (sctp_state(asoc, ESTABLISHED))
7054 /* Let another process have a go. Since we are going
7058 current_timeo = schedule_timeout(current_timeo);
7061 *timeo_p = current_timeo;
7065 finish_wait(&asoc->wait, &wait);
7067 /* Release the association's refcnt. */
7068 sctp_association_put(asoc);
7073 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7076 err = -ECONNREFUSED;
7080 err = sock_intr_errno(*timeo_p);
7088 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7090 struct sctp_endpoint *ep;
7094 ep = sctp_sk(sk)->ep;
7098 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
7099 TASK_INTERRUPTIBLE);
7101 if (list_empty(&ep->asocs)) {
7103 timeo = schedule_timeout(timeo);
7108 if (!sctp_sstate(sk, LISTENING))
7112 if (!list_empty(&ep->asocs))
7115 err = sock_intr_errno(timeo);
7116 if (signal_pending(current))
7124 finish_wait(sk_sleep(sk), &wait);
7129 static void sctp_wait_for_close(struct sock *sk, long timeout)
7134 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7135 if (list_empty(&sctp_sk(sk)->ep->asocs))
7138 timeout = schedule_timeout(timeout);
7140 } while (!signal_pending(current) && timeout);
7142 finish_wait(sk_sleep(sk), &wait);
7145 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7147 struct sk_buff *frag;
7152 /* Don't forget the fragments. */
7153 skb_walk_frags(skb, frag)
7154 sctp_skb_set_owner_r_frag(frag, sk);
7157 sctp_skb_set_owner_r(skb, sk);
7160 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7161 struct sctp_association *asoc)
7163 struct inet_sock *inet = inet_sk(sk);
7164 struct inet_sock *newinet;
7166 newsk->sk_type = sk->sk_type;
7167 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7168 newsk->sk_flags = sk->sk_flags;
7169 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7170 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7171 newsk->sk_reuse = sk->sk_reuse;
7173 newsk->sk_shutdown = sk->sk_shutdown;
7174 newsk->sk_destruct = sctp_destruct_sock;
7175 newsk->sk_family = sk->sk_family;
7176 newsk->sk_protocol = IPPROTO_SCTP;
7177 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7178 newsk->sk_sndbuf = sk->sk_sndbuf;
7179 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7180 newsk->sk_lingertime = sk->sk_lingertime;
7181 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7182 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7184 newinet = inet_sk(newsk);
7186 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7187 * getsockname() and getpeername()
7189 newinet->inet_sport = inet->inet_sport;
7190 newinet->inet_saddr = inet->inet_saddr;
7191 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7192 newinet->inet_dport = htons(asoc->peer.port);
7193 newinet->pmtudisc = inet->pmtudisc;
7194 newinet->inet_id = asoc->next_tsn ^ jiffies;
7196 newinet->uc_ttl = inet->uc_ttl;
7197 newinet->mc_loop = 1;
7198 newinet->mc_ttl = 1;
7199 newinet->mc_index = 0;
7200 newinet->mc_list = NULL;
7203 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7204 * and its messages to the newsk.
7206 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7207 struct sctp_association *assoc,
7208 sctp_socket_type_t type)
7210 struct sctp_sock *oldsp = sctp_sk(oldsk);
7211 struct sctp_sock *newsp = sctp_sk(newsk);
7212 struct sctp_bind_bucket *pp; /* hash list port iterator */
7213 struct sctp_endpoint *newep = newsp->ep;
7214 struct sk_buff *skb, *tmp;
7215 struct sctp_ulpevent *event;
7216 struct sctp_bind_hashbucket *head;
7217 struct list_head tmplist;
7219 /* Migrate socket buffer sizes and all the socket level options to the
7222 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7223 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7224 /* Brute force copy old sctp opt. */
7225 if (oldsp->do_auto_asconf) {
7226 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
7227 inet_sk_copy_descendant(newsk, oldsk);
7228 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
7230 inet_sk_copy_descendant(newsk, oldsk);
7232 /* Restore the ep value that was overwritten with the above structure
7238 /* Hook this new socket in to the bind_hash list. */
7239 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7240 inet_sk(oldsk)->inet_num)];
7242 spin_lock(&head->lock);
7243 pp = sctp_sk(oldsk)->bind_hash;
7244 sk_add_bind_node(newsk, &pp->owner);
7245 sctp_sk(newsk)->bind_hash = pp;
7246 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7247 spin_unlock(&head->lock);
7250 /* Copy the bind_addr list from the original endpoint to the new
7251 * endpoint so that we can handle restarts properly
7253 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7254 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7256 /* Move any messages in the old socket's receive queue that are for the
7257 * peeled off association to the new socket's receive queue.
7259 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7260 event = sctp_skb2event(skb);
7261 if (event->asoc == assoc) {
7262 __skb_unlink(skb, &oldsk->sk_receive_queue);
7263 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7264 sctp_skb_set_owner_r_frag(skb, newsk);
7268 /* Clean up any messages pending delivery due to partial
7269 * delivery. Three cases:
7270 * 1) No partial deliver; no work.
7271 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7272 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7274 skb_queue_head_init(&newsp->pd_lobby);
7275 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7277 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7278 struct sk_buff_head *queue;
7280 /* Decide which queue to move pd_lobby skbs to. */
7281 if (assoc->ulpq.pd_mode) {
7282 queue = &newsp->pd_lobby;
7284 queue = &newsk->sk_receive_queue;
7286 /* Walk through the pd_lobby, looking for skbs that
7287 * need moved to the new socket.
7289 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7290 event = sctp_skb2event(skb);
7291 if (event->asoc == assoc) {
7292 __skb_unlink(skb, &oldsp->pd_lobby);
7293 __skb_queue_tail(queue, skb);
7294 sctp_skb_set_owner_r_frag(skb, newsk);
7298 /* Clear up any skbs waiting for the partial
7299 * delivery to finish.
7301 if (assoc->ulpq.pd_mode)
7302 sctp_clear_pd(oldsk, NULL);
7306 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7307 sctp_skb_set_owner_r_frag(skb, newsk);
7309 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7310 sctp_skb_set_owner_r_frag(skb, newsk);
7312 /* Set the type of socket to indicate that it is peeled off from the
7313 * original UDP-style socket or created with the accept() call on a
7314 * TCP-style socket..
7318 /* Mark the new socket "in-use" by the user so that any packets
7319 * that may arrive on the association after we've moved it are
7320 * queued to the backlog. This prevents a potential race between
7321 * backlog processing on the old socket and new-packet processing
7322 * on the new socket.
7324 * The caller has just allocated newsk so we can guarantee that other
7325 * paths won't try to lock it and then oldsk.
7327 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7328 sctp_assoc_migrate(assoc, newsk);
7330 /* If the association on the newsk is already closed before accept()
7331 * is called, set RCV_SHUTDOWN flag.
7333 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7334 newsk->sk_shutdown |= RCV_SHUTDOWN;
7336 newsk->sk_state = SCTP_SS_ESTABLISHED;
7337 release_sock(newsk);
7341 /* This proto struct describes the ULP interface for SCTP. */
7342 struct proto sctp_prot = {
7344 .owner = THIS_MODULE,
7345 .close = sctp_close,
7346 .connect = sctp_connect,
7347 .disconnect = sctp_disconnect,
7348 .accept = sctp_accept,
7349 .ioctl = sctp_ioctl,
7350 .init = sctp_init_sock,
7351 .destroy = sctp_destroy_sock,
7352 .shutdown = sctp_shutdown,
7353 .setsockopt = sctp_setsockopt,
7354 .getsockopt = sctp_getsockopt,
7355 .sendmsg = sctp_sendmsg,
7356 .recvmsg = sctp_recvmsg,
7358 .backlog_rcv = sctp_backlog_rcv,
7360 .unhash = sctp_unhash,
7361 .get_port = sctp_get_port,
7362 .obj_size = sizeof(struct sctp_sock),
7363 .sysctl_mem = sysctl_sctp_mem,
7364 .sysctl_rmem = sysctl_sctp_rmem,
7365 .sysctl_wmem = sysctl_sctp_wmem,
7366 .memory_pressure = &sctp_memory_pressure,
7367 .enter_memory_pressure = sctp_enter_memory_pressure,
7368 .memory_allocated = &sctp_memory_allocated,
7369 .sockets_allocated = &sctp_sockets_allocated,
7372 #if IS_ENABLED(CONFIG_IPV6)
7374 struct proto sctpv6_prot = {
7376 .owner = THIS_MODULE,
7377 .close = sctp_close,
7378 .connect = sctp_connect,
7379 .disconnect = sctp_disconnect,
7380 .accept = sctp_accept,
7381 .ioctl = sctp_ioctl,
7382 .init = sctp_init_sock,
7383 .destroy = sctp_destroy_sock,
7384 .shutdown = sctp_shutdown,
7385 .setsockopt = sctp_setsockopt,
7386 .getsockopt = sctp_getsockopt,
7387 .sendmsg = sctp_sendmsg,
7388 .recvmsg = sctp_recvmsg,
7390 .backlog_rcv = sctp_backlog_rcv,
7392 .unhash = sctp_unhash,
7393 .get_port = sctp_get_port,
7394 .obj_size = sizeof(struct sctp6_sock),
7395 .sysctl_mem = sysctl_sctp_mem,
7396 .sysctl_rmem = sysctl_sctp_rmem,
7397 .sysctl_wmem = sysctl_sctp_wmem,
7398 .memory_pressure = &sctp_memory_pressure,
7399 .enter_memory_pressure = sctp_enter_memory_pressure,
7400 .memory_allocated = &sctp_memory_allocated,
7401 .sockets_allocated = &sctp_sockets_allocated,
7403 #endif /* IS_ENABLED(CONFIG_IPV6) */