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 static int sctp_memory_pressure;
106 static atomic_long_t sctp_memory_allocated;
107 struct percpu_counter sctp_sockets_allocated;
109 static void sctp_enter_memory_pressure(struct sock *sk)
111 sctp_memory_pressure = 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association *asoc)
120 if (asoc->ep->sndbuf_policy)
121 amt = asoc->sndbuf_used;
123 amt = sk_wmem_alloc_get(asoc->base.sk);
125 if (amt >= asoc->base.sk->sk_sndbuf) {
126 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
129 amt = sk_stream_wspace(asoc->base.sk);
134 amt = asoc->base.sk->sk_sndbuf - amt;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
150 struct sctp_association *asoc = chunk->asoc;
151 struct sock *sk = asoc->base.sk;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc);
156 skb_set_owner_w(chunk->skb, sk);
158 chunk->skb->destructor = sctp_wfree;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk->skb)->destructor_arg = chunk;
162 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
163 sizeof(struct sk_buff) +
164 sizeof(struct sctp_chunk);
166 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
167 sk->sk_wmem_queued += chunk->skb->truesize;
168 sk_mem_charge(sk, chunk->skb->truesize);
171 /* Verify that this is a valid address. */
172 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
177 /* Verify basic sockaddr. */
178 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
182 /* Is this a valid SCTP address? */
183 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
186 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
192 /* Look up the association by its id. If this is not a UDP-style
193 * socket, the ID field is always ignored.
195 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
197 struct sctp_association *asoc = NULL;
199 /* If this is not a UDP-style socket, assoc id should be ignored. */
200 if (!sctp_style(sk, UDP)) {
201 /* Return NULL if the socket state is not ESTABLISHED. It
202 * could be a TCP-style listening socket or a socket which
203 * hasn't yet called connect() to establish an association.
205 if (!sctp_sstate(sk, ESTABLISHED))
208 /* Get the first and the only association from the list. */
209 if (!list_empty(&sctp_sk(sk)->ep->asocs))
210 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
211 struct sctp_association, asocs);
215 /* Otherwise this is a UDP-style socket. */
216 if (!id || (id == (sctp_assoc_t)-1))
219 spin_lock_bh(&sctp_assocs_id_lock);
220 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
221 spin_unlock_bh(&sctp_assocs_id_lock);
223 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
229 /* Look up the transport from an address and an assoc id. If both address and
230 * id are specified, the associations matching the address and the id should be
233 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
234 struct sockaddr_storage *addr,
237 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
238 struct sctp_transport *transport;
239 union sctp_addr *laddr = (union sctp_addr *)addr;
241 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
248 id_asoc = sctp_id2assoc(sk, id);
249 if (id_asoc && (id_asoc != addr_asoc))
252 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
253 (union sctp_addr *)addr);
258 /* API 3.1.2 bind() - UDP Style Syntax
259 * The syntax of bind() is,
261 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
263 * sd - the socket descriptor returned by socket().
264 * addr - the address structure (struct sockaddr_in or struct
265 * sockaddr_in6 [RFC 2553]),
266 * addr_len - the size of the address structure.
268 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
274 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
277 /* Disallow binding twice. */
278 if (!sctp_sk(sk)->ep->base.bind_addr.port)
279 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
289 static long sctp_get_port_local(struct sock *, union sctp_addr *);
291 /* Verify this is a valid sockaddr. */
292 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
293 union sctp_addr *addr, int len)
297 /* Check minimum size. */
298 if (len < sizeof (struct sockaddr))
301 /* V4 mapped address are really of AF_INET family */
302 if (addr->sa.sa_family == AF_INET6 &&
303 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
304 if (!opt->pf->af_supported(AF_INET, opt))
307 /* Does this PF support this AF? */
308 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
312 /* If we get this far, af is valid. */
313 af = sctp_get_af_specific(addr->sa.sa_family);
315 if (len < af->sockaddr_len)
321 /* Bind a local address either to an endpoint or to an association. */
322 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
324 struct net *net = sock_net(sk);
325 struct sctp_sock *sp = sctp_sk(sk);
326 struct sctp_endpoint *ep = sp->ep;
327 struct sctp_bind_addr *bp = &ep->base.bind_addr;
332 /* Common sockaddr verification. */
333 af = sctp_sockaddr_af(sp, addr, len);
335 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
336 __func__, sk, addr, len);
340 snum = ntohs(addr->v4.sin_port);
342 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
343 __func__, sk, &addr->sa, bp->port, snum, len);
345 /* PF specific bind() address verification. */
346 if (!sp->pf->bind_verify(sp, addr))
347 return -EADDRNOTAVAIL;
349 /* We must either be unbound, or bind to the same port.
350 * It's OK to allow 0 ports if we are already bound.
351 * We'll just inhert an already bound port in this case
356 else if (snum != bp->port) {
357 pr_debug("%s: new port %d doesn't match existing port "
358 "%d\n", __func__, snum, bp->port);
363 if (snum && snum < PROT_SOCK &&
364 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
367 /* See if the address matches any of the addresses we may have
368 * already bound before checking against other endpoints.
370 if (sctp_bind_addr_match(bp, addr, sp))
373 /* Make sure we are allowed to bind here.
374 * The function sctp_get_port_local() does duplicate address
377 addr->v4.sin_port = htons(snum);
378 if ((ret = sctp_get_port_local(sk, addr))) {
382 /* Refresh ephemeral port. */
384 bp->port = inet_sk(sk)->inet_num;
386 /* Add the address to the bind address list.
387 * Use GFP_ATOMIC since BHs will be disabled.
389 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
391 /* Copy back into socket for getsockname() use. */
393 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
394 sp->pf->to_sk_saddr(addr, sk);
400 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
402 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
403 * at any one time. If a sender, after sending an ASCONF chunk, decides
404 * it needs to transfer another ASCONF Chunk, it MUST wait until the
405 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
406 * subsequent ASCONF. Note this restriction binds each side, so at any
407 * time two ASCONF may be in-transit on any given association (one sent
408 * from each endpoint).
410 static int sctp_send_asconf(struct sctp_association *asoc,
411 struct sctp_chunk *chunk)
413 struct net *net = sock_net(asoc->base.sk);
416 /* If there is an outstanding ASCONF chunk, queue it for later
419 if (asoc->addip_last_asconf) {
420 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
424 /* Hold the chunk until an ASCONF_ACK is received. */
425 sctp_chunk_hold(chunk);
426 retval = sctp_primitive_ASCONF(net, asoc, chunk);
428 sctp_chunk_free(chunk);
430 asoc->addip_last_asconf = chunk;
436 /* Add a list of addresses as bind addresses to local endpoint or
439 * Basically run through each address specified in the addrs/addrcnt
440 * array/length pair, determine if it is IPv6 or IPv4 and call
441 * sctp_do_bind() on it.
443 * If any of them fails, then the operation will be reversed and the
444 * ones that were added will be removed.
446 * Only sctp_setsockopt_bindx() is supposed to call this function.
448 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
453 struct sockaddr *sa_addr;
456 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
460 for (cnt = 0; cnt < addrcnt; cnt++) {
461 /* The list may contain either IPv4 or IPv6 address;
462 * determine the address length for walking thru the list.
465 af = sctp_get_af_specific(sa_addr->sa_family);
471 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
474 addr_buf += af->sockaddr_len;
478 /* Failed. Cleanup the ones that have been added */
480 sctp_bindx_rem(sk, addrs, cnt);
488 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
489 * associations that are part of the endpoint indicating that a list of local
490 * addresses are added to the endpoint.
492 * If any of the addresses is already in the bind address list of the
493 * association, we do not send the chunk for that association. But it will not
494 * affect other associations.
496 * Only sctp_setsockopt_bindx() is supposed to call this function.
498 static int sctp_send_asconf_add_ip(struct sock *sk,
499 struct sockaddr *addrs,
502 struct net *net = sock_net(sk);
503 struct sctp_sock *sp;
504 struct sctp_endpoint *ep;
505 struct sctp_association *asoc;
506 struct sctp_bind_addr *bp;
507 struct sctp_chunk *chunk;
508 struct sctp_sockaddr_entry *laddr;
509 union sctp_addr *addr;
510 union sctp_addr saveaddr;
517 if (!net->sctp.addip_enable)
523 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
524 __func__, sk, addrs, addrcnt);
526 list_for_each_entry(asoc, &ep->asocs, asocs) {
527 if (!asoc->peer.asconf_capable)
530 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
533 if (!sctp_state(asoc, ESTABLISHED))
536 /* Check if any address in the packed array of addresses is
537 * in the bind address list of the association. If so,
538 * do not send the asconf chunk to its peer, but continue with
539 * other associations.
542 for (i = 0; i < addrcnt; i++) {
544 af = sctp_get_af_specific(addr->v4.sin_family);
550 if (sctp_assoc_lookup_laddr(asoc, addr))
553 addr_buf += af->sockaddr_len;
558 /* Use the first valid address in bind addr list of
559 * association as Address Parameter of ASCONF CHUNK.
561 bp = &asoc->base.bind_addr;
562 p = bp->address_list.next;
563 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
564 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
565 addrcnt, SCTP_PARAM_ADD_IP);
571 /* Add the new addresses to the bind address list with
572 * use_as_src set to 0.
575 for (i = 0; i < addrcnt; i++) {
577 af = sctp_get_af_specific(addr->v4.sin_family);
578 memcpy(&saveaddr, addr, af->sockaddr_len);
579 retval = sctp_add_bind_addr(bp, &saveaddr,
580 SCTP_ADDR_NEW, GFP_ATOMIC);
581 addr_buf += af->sockaddr_len;
583 if (asoc->src_out_of_asoc_ok) {
584 struct sctp_transport *trans;
586 list_for_each_entry(trans,
587 &asoc->peer.transport_addr_list, transports) {
588 /* Clear the source and route cache */
589 dst_release(trans->dst);
590 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
591 2*asoc->pathmtu, 4380));
592 trans->ssthresh = asoc->peer.i.a_rwnd;
593 trans->rto = asoc->rto_initial;
594 sctp_max_rto(asoc, trans);
595 trans->rtt = trans->srtt = trans->rttvar = 0;
596 sctp_transport_route(trans, NULL,
597 sctp_sk(asoc->base.sk));
600 retval = sctp_send_asconf(asoc, chunk);
607 /* Remove a list of addresses from bind addresses list. Do not remove the
610 * Basically run through each address specified in the addrs/addrcnt
611 * array/length pair, determine if it is IPv6 or IPv4 and call
612 * sctp_del_bind() on it.
614 * If any of them fails, then the operation will be reversed and the
615 * ones that were removed will be added back.
617 * At least one address has to be left; if only one address is
618 * available, the operation will return -EBUSY.
620 * Only sctp_setsockopt_bindx() is supposed to call this function.
622 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
624 struct sctp_sock *sp = sctp_sk(sk);
625 struct sctp_endpoint *ep = sp->ep;
627 struct sctp_bind_addr *bp = &ep->base.bind_addr;
630 union sctp_addr *sa_addr;
633 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
634 __func__, sk, addrs, addrcnt);
637 for (cnt = 0; cnt < addrcnt; cnt++) {
638 /* If the bind address list is empty or if there is only one
639 * bind address, there is nothing more to be removed (we need
640 * at least one address here).
642 if (list_empty(&bp->address_list) ||
643 (sctp_list_single_entry(&bp->address_list))) {
649 af = sctp_get_af_specific(sa_addr->sa.sa_family);
655 if (!af->addr_valid(sa_addr, sp, NULL)) {
656 retval = -EADDRNOTAVAIL;
660 if (sa_addr->v4.sin_port &&
661 sa_addr->v4.sin_port != htons(bp->port)) {
666 if (!sa_addr->v4.sin_port)
667 sa_addr->v4.sin_port = htons(bp->port);
669 /* FIXME - There is probably a need to check if sk->sk_saddr and
670 * sk->sk_rcv_addr are currently set to one of the addresses to
671 * be removed. This is something which needs to be looked into
672 * when we are fixing the outstanding issues with multi-homing
673 * socket routing and failover schemes. Refer to comments in
674 * sctp_do_bind(). -daisy
676 retval = sctp_del_bind_addr(bp, sa_addr);
678 addr_buf += af->sockaddr_len;
681 /* Failed. Add the ones that has been removed back */
683 sctp_bindx_add(sk, addrs, cnt);
691 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
692 * the associations that are part of the endpoint indicating that a list of
693 * local addresses are removed from the endpoint.
695 * If any of the addresses is already in the bind address list of the
696 * association, we do not send the chunk for that association. But it will not
697 * affect other associations.
699 * Only sctp_setsockopt_bindx() is supposed to call this function.
701 static int sctp_send_asconf_del_ip(struct sock *sk,
702 struct sockaddr *addrs,
705 struct net *net = sock_net(sk);
706 struct sctp_sock *sp;
707 struct sctp_endpoint *ep;
708 struct sctp_association *asoc;
709 struct sctp_transport *transport;
710 struct sctp_bind_addr *bp;
711 struct sctp_chunk *chunk;
712 union sctp_addr *laddr;
715 struct sctp_sockaddr_entry *saddr;
721 if (!net->sctp.addip_enable)
727 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
728 __func__, sk, addrs, addrcnt);
730 list_for_each_entry(asoc, &ep->asocs, asocs) {
732 if (!asoc->peer.asconf_capable)
735 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
738 if (!sctp_state(asoc, ESTABLISHED))
741 /* Check if any address in the packed array of addresses is
742 * not present in the bind address list of the association.
743 * If so, do not send the asconf chunk to its peer, but
744 * continue with other associations.
747 for (i = 0; i < addrcnt; i++) {
749 af = sctp_get_af_specific(laddr->v4.sin_family);
755 if (!sctp_assoc_lookup_laddr(asoc, laddr))
758 addr_buf += af->sockaddr_len;
763 /* Find one address in the association's bind address list
764 * that is not in the packed array of addresses. This is to
765 * make sure that we do not delete all the addresses in the
768 bp = &asoc->base.bind_addr;
769 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
771 if ((laddr == NULL) && (addrcnt == 1)) {
772 if (asoc->asconf_addr_del_pending)
774 asoc->asconf_addr_del_pending =
775 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
776 if (asoc->asconf_addr_del_pending == NULL) {
780 asoc->asconf_addr_del_pending->sa.sa_family =
782 asoc->asconf_addr_del_pending->v4.sin_port =
784 if (addrs->sa_family == AF_INET) {
785 struct sockaddr_in *sin;
787 sin = (struct sockaddr_in *)addrs;
788 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
789 } else if (addrs->sa_family == AF_INET6) {
790 struct sockaddr_in6 *sin6;
792 sin6 = (struct sockaddr_in6 *)addrs;
793 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
796 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
797 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
798 asoc->asconf_addr_del_pending);
800 asoc->src_out_of_asoc_ok = 1;
808 /* We do not need RCU protection throughout this loop
809 * because this is done under a socket lock from the
812 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
820 /* Reset use_as_src flag for the addresses in the bind address
821 * list that are to be deleted.
824 for (i = 0; i < addrcnt; i++) {
826 af = sctp_get_af_specific(laddr->v4.sin_family);
827 list_for_each_entry(saddr, &bp->address_list, list) {
828 if (sctp_cmp_addr_exact(&saddr->a, laddr))
829 saddr->state = SCTP_ADDR_DEL;
831 addr_buf += af->sockaddr_len;
834 /* Update the route and saddr entries for all the transports
835 * as some of the addresses in the bind address list are
836 * about to be deleted and cannot be used as source addresses.
838 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
840 dst_release(transport->dst);
841 sctp_transport_route(transport, NULL,
842 sctp_sk(asoc->base.sk));
846 /* We don't need to transmit ASCONF */
848 retval = sctp_send_asconf(asoc, chunk);
854 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
855 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
857 struct sock *sk = sctp_opt2sk(sp);
858 union sctp_addr *addr;
861 /* It is safe to write port space in caller. */
863 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
864 af = sctp_get_af_specific(addr->sa.sa_family);
867 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
870 if (addrw->state == SCTP_ADDR_NEW)
871 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
873 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
876 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
879 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
882 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
883 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
886 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
887 * Section 3.1.2 for this usage.
889 * addrs is a pointer to an array of one or more socket addresses. Each
890 * address is contained in its appropriate structure (i.e. struct
891 * sockaddr_in or struct sockaddr_in6) the family of the address type
892 * must be used to distinguish the address length (note that this
893 * representation is termed a "packed array" of addresses). The caller
894 * specifies the number of addresses in the array with addrcnt.
896 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
897 * -1, and sets errno to the appropriate error code.
899 * For SCTP, the port given in each socket address must be the same, or
900 * sctp_bindx() will fail, setting errno to EINVAL.
902 * The flags parameter is formed from the bitwise OR of zero or more of
903 * the following currently defined flags:
905 * SCTP_BINDX_ADD_ADDR
907 * SCTP_BINDX_REM_ADDR
909 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
910 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
911 * addresses from the association. The two flags are mutually exclusive;
912 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
913 * not remove all addresses from an association; sctp_bindx() will
914 * reject such an attempt with EINVAL.
916 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
917 * additional addresses with an endpoint after calling bind(). Or use
918 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
919 * socket is associated with so that no new association accepted will be
920 * associated with those addresses. If the endpoint supports dynamic
921 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
922 * endpoint to send the appropriate message to the peer to change the
923 * peers address lists.
925 * Adding and removing addresses from a connected association is
926 * optional functionality. Implementations that do not support this
927 * functionality should return EOPNOTSUPP.
929 * Basically do nothing but copying the addresses from user to kernel
930 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
931 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
934 * We don't use copy_from_user() for optimization: we first do the
935 * sanity checks (buffer size -fast- and access check-healthy
936 * pointer); if all of those succeed, then we can alloc the memory
937 * (expensive operation) needed to copy the data to kernel. Then we do
938 * the copying without checking the user space area
939 * (__copy_from_user()).
941 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
944 * sk The sk of the socket
945 * addrs The pointer to the addresses in user land
946 * addrssize Size of the addrs buffer
947 * op Operation to perform (add or remove, see the flags of
950 * Returns 0 if ok, <0 errno code on error.
952 static int sctp_setsockopt_bindx(struct sock *sk,
953 struct sockaddr __user *addrs,
954 int addrs_size, int op)
956 struct sockaddr *kaddrs;
960 struct sockaddr *sa_addr;
964 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
965 __func__, sk, addrs, addrs_size, op);
967 if (unlikely(addrs_size <= 0))
970 /* Check the user passed a healthy pointer. */
971 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
974 /* Alloc space for the address array in kernel memory. */
975 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
976 if (unlikely(!kaddrs))
979 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
984 /* Walk through the addrs buffer and count the number of addresses. */
986 while (walk_size < addrs_size) {
987 if (walk_size + sizeof(sa_family_t) > addrs_size) {
993 af = sctp_get_af_specific(sa_addr->sa_family);
995 /* If the address family is not supported or if this address
996 * causes the address buffer to overflow return EINVAL.
998 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1003 addr_buf += af->sockaddr_len;
1004 walk_size += af->sockaddr_len;
1009 case SCTP_BINDX_ADD_ADDR:
1010 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1013 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1016 case SCTP_BINDX_REM_ADDR:
1017 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1020 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1034 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1036 * Common routine for handling connect() and sctp_connectx().
1037 * Connect will come in with just a single address.
1039 static int __sctp_connect(struct sock *sk,
1040 struct sockaddr *kaddrs,
1042 sctp_assoc_t *assoc_id)
1044 struct net *net = sock_net(sk);
1045 struct sctp_sock *sp;
1046 struct sctp_endpoint *ep;
1047 struct sctp_association *asoc = NULL;
1048 struct sctp_association *asoc2;
1049 struct sctp_transport *transport;
1056 union sctp_addr *sa_addr = NULL;
1058 unsigned short port;
1059 unsigned int f_flags = 0;
1064 /* connect() cannot be done on a socket that is already in ESTABLISHED
1065 * state - UDP-style peeled off socket or a TCP-style socket that
1066 * is already connected.
1067 * It cannot be done even on a TCP-style listening socket.
1069 if (sctp_sstate(sk, ESTABLISHED) ||
1070 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1075 /* Walk through the addrs buffer and count the number of addresses. */
1077 while (walk_size < addrs_size) {
1080 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1086 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1088 /* If the address family is not supported or if this address
1089 * causes the address buffer to overflow return EINVAL.
1091 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1096 port = ntohs(sa_addr->v4.sin_port);
1098 /* Save current address so we can work with it */
1099 memcpy(&to, sa_addr, af->sockaddr_len);
1101 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1105 /* Make sure the destination port is correctly set
1108 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1113 /* Check if there already is a matching association on the
1114 * endpoint (other than the one created here).
1116 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1117 if (asoc2 && asoc2 != asoc) {
1118 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1125 /* If we could not find a matching association on the endpoint,
1126 * make sure that there is no peeled-off association matching
1127 * the peer address even on another socket.
1129 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1130 err = -EADDRNOTAVAIL;
1135 /* If a bind() or sctp_bindx() is not called prior to
1136 * an sctp_connectx() call, the system picks an
1137 * ephemeral port and will choose an address set
1138 * equivalent to binding with a wildcard address.
1140 if (!ep->base.bind_addr.port) {
1141 if (sctp_autobind(sk)) {
1147 * If an unprivileged user inherits a 1-many
1148 * style socket with open associations on a
1149 * privileged port, it MAY be permitted to
1150 * accept new associations, but it SHOULD NOT
1151 * be permitted to open new associations.
1153 if (ep->base.bind_addr.port < PROT_SOCK &&
1154 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1160 scope = sctp_scope(&to);
1161 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1167 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1175 /* Prime the peer's transport structures. */
1176 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1184 addr_buf += af->sockaddr_len;
1185 walk_size += af->sockaddr_len;
1188 /* In case the user of sctp_connectx() wants an association
1189 * id back, assign one now.
1192 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1197 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1202 /* Initialize sk's dport and daddr for getpeername() */
1203 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1204 sp->pf->to_sk_daddr(sa_addr, sk);
1207 /* in-kernel sockets don't generally have a file allocated to them
1208 * if all they do is call sock_create_kern().
1210 if (sk->sk_socket->file)
1211 f_flags = sk->sk_socket->file->f_flags;
1213 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1215 err = sctp_wait_for_connect(asoc, &timeo);
1216 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1217 *assoc_id = asoc->assoc_id;
1219 /* Don't free association on exit. */
1223 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1224 __func__, asoc, kaddrs, err);
1227 /* sctp_primitive_ASSOCIATE may have added this association
1228 * To the hash table, try to unhash it, just in case, its a noop
1229 * if it wasn't hashed so we're safe
1231 sctp_unhash_established(asoc);
1232 sctp_association_free(asoc);
1237 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1240 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1241 * sctp_assoc_t *asoc);
1243 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1244 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1245 * or IPv6 addresses.
1247 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1248 * Section 3.1.2 for this usage.
1250 * addrs is a pointer to an array of one or more socket addresses. Each
1251 * address is contained in its appropriate structure (i.e. struct
1252 * sockaddr_in or struct sockaddr_in6) the family of the address type
1253 * must be used to distengish the address length (note that this
1254 * representation is termed a "packed array" of addresses). The caller
1255 * specifies the number of addresses in the array with addrcnt.
1257 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1258 * the association id of the new association. On failure, sctp_connectx()
1259 * returns -1, and sets errno to the appropriate error code. The assoc_id
1260 * is not touched by the kernel.
1262 * For SCTP, the port given in each socket address must be the same, or
1263 * sctp_connectx() will fail, setting errno to EINVAL.
1265 * An application can use sctp_connectx to initiate an association with
1266 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1267 * allows a caller to specify multiple addresses at which a peer can be
1268 * reached. The way the SCTP stack uses the list of addresses to set up
1269 * the association is implementation dependent. This function only
1270 * specifies that the stack will try to make use of all the addresses in
1271 * the list when needed.
1273 * Note that the list of addresses passed in is only used for setting up
1274 * the association. It does not necessarily equal the set of addresses
1275 * the peer uses for the resulting association. If the caller wants to
1276 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1277 * retrieve them after the association has been set up.
1279 * Basically do nothing but copying the addresses from user to kernel
1280 * land and invoking either sctp_connectx(). This is used for tunneling
1281 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1283 * We don't use copy_from_user() for optimization: we first do the
1284 * sanity checks (buffer size -fast- and access check-healthy
1285 * pointer); if all of those succeed, then we can alloc the memory
1286 * (expensive operation) needed to copy the data to kernel. Then we do
1287 * the copying without checking the user space area
1288 * (__copy_from_user()).
1290 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1293 * sk The sk of the socket
1294 * addrs The pointer to the addresses in user land
1295 * addrssize Size of the addrs buffer
1297 * Returns >=0 if ok, <0 errno code on error.
1299 static int __sctp_setsockopt_connectx(struct sock *sk,
1300 struct sockaddr __user *addrs,
1302 sctp_assoc_t *assoc_id)
1304 struct sockaddr *kaddrs;
1305 gfp_t gfp = GFP_KERNEL;
1308 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1309 __func__, sk, addrs, addrs_size);
1311 if (unlikely(addrs_size <= 0))
1314 /* Check the user passed a healthy pointer. */
1315 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1318 /* Alloc space for the address array in kernel memory. */
1319 if (sk->sk_socket->file)
1320 gfp = GFP_USER | __GFP_NOWARN;
1321 kaddrs = kmalloc(addrs_size, gfp);
1322 if (unlikely(!kaddrs))
1325 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1328 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1337 * This is an older interface. It's kept for backward compatibility
1338 * to the option that doesn't provide association id.
1340 static int sctp_setsockopt_connectx_old(struct sock *sk,
1341 struct sockaddr __user *addrs,
1344 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1348 * New interface for the API. The since the API is done with a socket
1349 * option, to make it simple we feed back the association id is as a return
1350 * indication to the call. Error is always negative and association id is
1353 static int sctp_setsockopt_connectx(struct sock *sk,
1354 struct sockaddr __user *addrs,
1357 sctp_assoc_t assoc_id = 0;
1360 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1369 * New (hopefully final) interface for the API.
1370 * We use the sctp_getaddrs_old structure so that use-space library
1371 * can avoid any unnecessary allocations. The only different part
1372 * is that we store the actual length of the address buffer into the
1373 * addrs_num structure member. That way we can re-use the existing
1376 #ifdef CONFIG_COMPAT
1377 struct compat_sctp_getaddrs_old {
1378 sctp_assoc_t assoc_id;
1380 compat_uptr_t addrs; /* struct sockaddr * */
1384 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1385 char __user *optval,
1388 struct sctp_getaddrs_old param;
1389 sctp_assoc_t assoc_id = 0;
1392 #ifdef CONFIG_COMPAT
1393 if (is_compat_task()) {
1394 struct compat_sctp_getaddrs_old param32;
1396 if (len < sizeof(param32))
1398 if (copy_from_user(¶m32, optval, sizeof(param32)))
1401 param.assoc_id = param32.assoc_id;
1402 param.addr_num = param32.addr_num;
1403 param.addrs = compat_ptr(param32.addrs);
1407 if (len < sizeof(param))
1409 if (copy_from_user(¶m, optval, sizeof(param)))
1413 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1414 param.addrs, param.addr_num,
1416 if (err == 0 || err == -EINPROGRESS) {
1417 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1419 if (put_user(sizeof(assoc_id), optlen))
1426 /* API 3.1.4 close() - UDP Style Syntax
1427 * Applications use close() to perform graceful shutdown (as described in
1428 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1429 * by a UDP-style socket.
1433 * ret = close(int sd);
1435 * sd - the socket descriptor of the associations to be closed.
1437 * To gracefully shutdown a specific association represented by the
1438 * UDP-style socket, an application should use the sendmsg() call,
1439 * passing no user data, but including the appropriate flag in the
1440 * ancillary data (see Section xxxx).
1442 * If sd in the close() call is a branched-off socket representing only
1443 * one association, the shutdown is performed on that association only.
1445 * 4.1.6 close() - TCP Style Syntax
1447 * Applications use close() to gracefully close down an association.
1451 * int close(int sd);
1453 * sd - the socket descriptor of the association to be closed.
1455 * After an application calls close() on a socket descriptor, no further
1456 * socket operations will succeed on that descriptor.
1458 * API 7.1.4 SO_LINGER
1460 * An application using the TCP-style socket can use this option to
1461 * perform the SCTP ABORT primitive. The linger option structure is:
1464 * int l_onoff; // option on/off
1465 * int l_linger; // linger time
1468 * To enable the option, set l_onoff to 1. If the l_linger value is set
1469 * to 0, calling close() is the same as the ABORT primitive. If the
1470 * value is set to a negative value, the setsockopt() call will return
1471 * an error. If the value is set to a positive value linger_time, the
1472 * close() can be blocked for at most linger_time ms. If the graceful
1473 * shutdown phase does not finish during this period, close() will
1474 * return but the graceful shutdown phase continues in the system.
1476 static void sctp_close(struct sock *sk, long timeout)
1478 struct net *net = sock_net(sk);
1479 struct sctp_endpoint *ep;
1480 struct sctp_association *asoc;
1481 struct list_head *pos, *temp;
1482 unsigned int data_was_unread;
1484 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1487 sk->sk_shutdown = SHUTDOWN_MASK;
1488 sk->sk_state = SCTP_SS_CLOSING;
1490 ep = sctp_sk(sk)->ep;
1492 /* Clean up any skbs sitting on the receive queue. */
1493 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1494 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1496 /* Walk all associations on an endpoint. */
1497 list_for_each_safe(pos, temp, &ep->asocs) {
1498 asoc = list_entry(pos, struct sctp_association, asocs);
1500 if (sctp_style(sk, TCP)) {
1501 /* A closed association can still be in the list if
1502 * it belongs to a TCP-style listening socket that is
1503 * not yet accepted. If so, free it. If not, send an
1504 * ABORT or SHUTDOWN based on the linger options.
1506 if (sctp_state(asoc, CLOSED)) {
1507 sctp_unhash_established(asoc);
1508 sctp_association_free(asoc);
1513 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1514 !skb_queue_empty(&asoc->ulpq.reasm) ||
1515 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1516 struct sctp_chunk *chunk;
1518 chunk = sctp_make_abort_user(asoc, NULL, 0);
1520 sctp_primitive_ABORT(net, asoc, chunk);
1522 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1525 /* On a TCP-style socket, block for at most linger_time if set. */
1526 if (sctp_style(sk, TCP) && timeout)
1527 sctp_wait_for_close(sk, timeout);
1529 /* This will run the backlog queue. */
1532 /* Supposedly, no process has access to the socket, but
1533 * the net layers still may.
1534 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1535 * held and that should be grabbed before socket lock.
1537 spin_lock_bh(&net->sctp.addr_wq_lock);
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);
1547 spin_unlock_bh(&net->sctp.addr_wq_lock);
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 sock *sk, struct msghdr *msg, size_t msg_len)
1591 struct net *net = sock_net(sk);
1592 struct sctp_sock *sp;
1593 struct sctp_endpoint *ep;
1594 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1595 struct sctp_transport *transport, *chunk_tp;
1596 struct sctp_chunk *chunk;
1598 struct sockaddr *msg_name = NULL;
1599 struct sctp_sndrcvinfo default_sinfo;
1600 struct sctp_sndrcvinfo *sinfo;
1601 struct sctp_initmsg *sinit;
1602 sctp_assoc_t associd = 0;
1603 sctp_cmsgs_t cmsgs = { NULL };
1605 bool fill_sinfo_ttl = false, wait_connect = false;
1606 struct sctp_datamsg *datamsg;
1607 int msg_flags = msg->msg_flags;
1608 __u16 sinfo_flags = 0;
1616 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1619 /* We cannot send a message over a TCP-style listening socket. */
1620 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1625 /* Parse out the SCTP CMSGs. */
1626 err = sctp_msghdr_parse(msg, &cmsgs);
1628 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1632 /* Fetch the destination address for this packet. This
1633 * address only selects the association--it is not necessarily
1634 * the address we will send to.
1635 * For a peeled-off socket, msg_name is ignored.
1637 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1638 int msg_namelen = msg->msg_namelen;
1640 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1645 if (msg_namelen > sizeof(to))
1646 msg_namelen = sizeof(to);
1647 memcpy(&to, msg->msg_name, msg_namelen);
1648 msg_name = msg->msg_name;
1652 if (cmsgs.sinfo != NULL) {
1653 memset(&default_sinfo, 0, sizeof(default_sinfo));
1654 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1655 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1656 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1657 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1658 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1660 sinfo = &default_sinfo;
1661 fill_sinfo_ttl = true;
1663 sinfo = cmsgs.srinfo;
1665 /* Did the user specify SNDINFO/SNDRCVINFO? */
1667 sinfo_flags = sinfo->sinfo_flags;
1668 associd = sinfo->sinfo_assoc_id;
1671 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1672 msg_len, sinfo_flags);
1674 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1675 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1680 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1681 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1682 * If SCTP_ABORT is set, the message length could be non zero with
1683 * the msg_iov set to the user abort reason.
1685 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1686 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1691 /* If SCTP_ADDR_OVER is set, there must be an address
1692 * specified in msg_name.
1694 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1701 pr_debug("%s: about to look up association\n", __func__);
1705 /* If a msg_name has been specified, assume this is to be used. */
1707 /* Look for a matching association on the endpoint. */
1708 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1710 /* If we could not find a matching association on the
1711 * endpoint, make sure that it is not a TCP-style
1712 * socket that already has an association or there is
1713 * no peeled-off association on another socket.
1715 if ((sctp_style(sk, TCP) &&
1716 sctp_sstate(sk, ESTABLISHED)) ||
1717 sctp_endpoint_is_peeled_off(ep, &to)) {
1718 err = -EADDRNOTAVAIL;
1723 asoc = sctp_id2assoc(sk, associd);
1731 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1733 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1734 * socket that has an association in CLOSED state. This can
1735 * happen when an accepted socket has an association that is
1738 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1743 if (sinfo_flags & SCTP_EOF) {
1744 pr_debug("%s: shutting down association:%p\n",
1747 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1751 if (sinfo_flags & SCTP_ABORT) {
1753 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1759 pr_debug("%s: aborting association:%p\n",
1762 sctp_primitive_ABORT(net, asoc, chunk);
1768 /* Do we need to create the association? */
1770 pr_debug("%s: there is no association yet\n", __func__);
1772 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1777 /* Check for invalid stream against the stream counts,
1778 * either the default or the user specified stream counts.
1781 if (!sinit || !sinit->sinit_num_ostreams) {
1782 /* Check against the defaults. */
1783 if (sinfo->sinfo_stream >=
1784 sp->initmsg.sinit_num_ostreams) {
1789 /* Check against the requested. */
1790 if (sinfo->sinfo_stream >=
1791 sinit->sinit_num_ostreams) {
1799 * API 3.1.2 bind() - UDP Style Syntax
1800 * If a bind() or sctp_bindx() is not called prior to a
1801 * sendmsg() call that initiates a new association, the
1802 * system picks an ephemeral port and will choose an address
1803 * set equivalent to binding with a wildcard address.
1805 if (!ep->base.bind_addr.port) {
1806 if (sctp_autobind(sk)) {
1812 * If an unprivileged user inherits a one-to-many
1813 * style socket with open associations on a privileged
1814 * port, it MAY be permitted to accept new associations,
1815 * but it SHOULD NOT be permitted to open new
1818 if (ep->base.bind_addr.port < PROT_SOCK &&
1819 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1825 scope = sctp_scope(&to);
1826 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1832 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1838 /* If the SCTP_INIT ancillary data is specified, set all
1839 * the association init values accordingly.
1842 if (sinit->sinit_num_ostreams) {
1843 asoc->c.sinit_num_ostreams =
1844 sinit->sinit_num_ostreams;
1846 if (sinit->sinit_max_instreams) {
1847 asoc->c.sinit_max_instreams =
1848 sinit->sinit_max_instreams;
1850 if (sinit->sinit_max_attempts) {
1851 asoc->max_init_attempts
1852 = sinit->sinit_max_attempts;
1854 if (sinit->sinit_max_init_timeo) {
1855 asoc->max_init_timeo =
1856 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1860 /* Prime the peer's transport structures. */
1861 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1868 /* ASSERT: we have a valid association at this point. */
1869 pr_debug("%s: we have a valid association\n", __func__);
1872 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1873 * one with some defaults.
1875 memset(&default_sinfo, 0, sizeof(default_sinfo));
1876 default_sinfo.sinfo_stream = asoc->default_stream;
1877 default_sinfo.sinfo_flags = asoc->default_flags;
1878 default_sinfo.sinfo_ppid = asoc->default_ppid;
1879 default_sinfo.sinfo_context = asoc->default_context;
1880 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1881 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1883 sinfo = &default_sinfo;
1884 } else if (fill_sinfo_ttl) {
1885 /* In case SNDINFO was specified, we still need to fill
1886 * it with a default ttl from the assoc here.
1888 sinfo->sinfo_timetolive = asoc->default_timetolive;
1891 /* API 7.1.7, the sndbuf size per association bounds the
1892 * maximum size of data that can be sent in a single send call.
1894 if (msg_len > sk->sk_sndbuf) {
1899 if (asoc->pmtu_pending)
1900 sctp_assoc_pending_pmtu(sk, asoc);
1902 /* If fragmentation is disabled and the message length exceeds the
1903 * association fragmentation point, return EMSGSIZE. The I-D
1904 * does not specify what this error is, but this looks like
1907 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1912 /* Check for invalid stream. */
1913 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1918 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1919 if (!sctp_wspace(asoc)) {
1920 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1925 /* If an address is passed with the sendto/sendmsg call, it is used
1926 * to override the primary destination address in the TCP model, or
1927 * when SCTP_ADDR_OVER flag is set in the UDP model.
1929 if ((sctp_style(sk, TCP) && msg_name) ||
1930 (sinfo_flags & SCTP_ADDR_OVER)) {
1931 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1939 /* Auto-connect, if we aren't connected already. */
1940 if (sctp_state(asoc, CLOSED)) {
1941 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1945 wait_connect = true;
1946 pr_debug("%s: we associated primitively\n", __func__);
1949 /* Break the message into multiple chunks of maximum size. */
1950 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1951 if (IS_ERR(datamsg)) {
1952 err = PTR_ERR(datamsg);
1956 /* Now send the (possibly) fragmented message. */
1957 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1958 /* Do accounting for the write space. */
1959 sctp_set_owner_w(chunk);
1961 chunk->transport = chunk_tp;
1964 /* Send it to the lower layers. Note: all chunks
1965 * must either fail or succeed. The lower layer
1966 * works that way today. Keep it that way or this
1969 err = sctp_primitive_SEND(net, asoc, datamsg);
1970 sctp_datamsg_put(datamsg);
1971 /* Did the lower layer accept the chunk? */
1975 pr_debug("%s: we sent primitively\n", __func__);
1979 if (unlikely(wait_connect)) {
1980 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
1981 sctp_wait_for_connect(asoc, &timeo);
1984 /* If we are already past ASSOCIATE, the lower
1985 * layers are responsible for association cleanup.
1991 sctp_unhash_established(asoc);
1992 sctp_association_free(asoc);
1998 return sctp_error(sk, msg_flags, err);
2005 err = sock_error(sk);
2015 /* This is an extended version of skb_pull() that removes the data from the
2016 * start of a skb even when data is spread across the list of skb's in the
2017 * frag_list. len specifies the total amount of data that needs to be removed.
2018 * when 'len' bytes could be removed from the skb, it returns 0.
2019 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2020 * could not be removed.
2022 static int sctp_skb_pull(struct sk_buff *skb, int len)
2024 struct sk_buff *list;
2025 int skb_len = skb_headlen(skb);
2028 if (len <= skb_len) {
2029 __skb_pull(skb, len);
2033 __skb_pull(skb, skb_len);
2035 skb_walk_frags(skb, list) {
2036 rlen = sctp_skb_pull(list, len);
2037 skb->len -= (len-rlen);
2038 skb->data_len -= (len-rlen);
2049 /* API 3.1.3 recvmsg() - UDP Style Syntax
2051 * ssize_t recvmsg(int socket, struct msghdr *message,
2054 * socket - the socket descriptor of the endpoint.
2055 * message - pointer to the msghdr structure which contains a single
2056 * user message and possibly some ancillary data.
2058 * See Section 5 for complete description of the data
2061 * flags - flags sent or received with the user message, see Section
2062 * 5 for complete description of the flags.
2064 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2065 int noblock, int flags, int *addr_len)
2067 struct sctp_ulpevent *event = NULL;
2068 struct sctp_sock *sp = sctp_sk(sk);
2069 struct sk_buff *skb;
2074 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2075 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2080 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2085 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2089 /* Get the total length of the skb including any skb's in the
2098 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2100 event = sctp_skb2event(skb);
2105 sock_recv_ts_and_drops(msg, sk, skb);
2106 if (sctp_ulpevent_is_notification(event)) {
2107 msg->msg_flags |= MSG_NOTIFICATION;
2108 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2110 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2113 /* Check if we allow SCTP_NXTINFO. */
2114 if (sp->recvnxtinfo)
2115 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2116 /* Check if we allow SCTP_RCVINFO. */
2117 if (sp->recvrcvinfo)
2118 sctp_ulpevent_read_rcvinfo(event, msg);
2119 /* Check if we allow SCTP_SNDRCVINFO. */
2120 if (sp->subscribe.sctp_data_io_event)
2121 sctp_ulpevent_read_sndrcvinfo(event, msg);
2125 /* If skb's length exceeds the user's buffer, update the skb and
2126 * push it back to the receive_queue so that the next call to
2127 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2129 if (skb_len > copied) {
2130 msg->msg_flags &= ~MSG_EOR;
2131 if (flags & MSG_PEEK)
2133 sctp_skb_pull(skb, copied);
2134 skb_queue_head(&sk->sk_receive_queue, skb);
2136 /* When only partial message is copied to the user, increase
2137 * rwnd by that amount. If all the data in the skb is read,
2138 * rwnd is updated when the event is freed.
2140 if (!sctp_ulpevent_is_notification(event))
2141 sctp_assoc_rwnd_increase(event->asoc, copied);
2143 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2144 (event->msg_flags & MSG_EOR))
2145 msg->msg_flags |= MSG_EOR;
2147 msg->msg_flags &= ~MSG_EOR;
2150 if (flags & MSG_PEEK) {
2151 /* Release the skb reference acquired after peeking the skb in
2152 * sctp_skb_recv_datagram().
2156 /* Free the event which includes releasing the reference to
2157 * the owner of the skb, freeing the skb and updating the
2160 sctp_ulpevent_free(event);
2167 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2169 * This option is a on/off flag. If enabled no SCTP message
2170 * fragmentation will be performed. Instead if a message being sent
2171 * exceeds the current PMTU size, the message will NOT be sent and
2172 * instead a error will be indicated to the user.
2174 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2175 char __user *optval,
2176 unsigned int optlen)
2180 if (optlen < sizeof(int))
2183 if (get_user(val, (int __user *)optval))
2186 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2191 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2192 unsigned int optlen)
2194 struct sctp_association *asoc;
2195 struct sctp_ulpevent *event;
2197 if (optlen > sizeof(struct sctp_event_subscribe))
2199 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2202 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2203 * if there is no data to be sent or retransmit, the stack will
2204 * immediately send up this notification.
2206 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2207 &sctp_sk(sk)->subscribe)) {
2208 asoc = sctp_id2assoc(sk, 0);
2210 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2211 event = sctp_ulpevent_make_sender_dry_event(asoc,
2216 sctp_ulpq_tail_event(&asoc->ulpq, event);
2223 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2225 * This socket option is applicable to the UDP-style socket only. When
2226 * set it will cause associations that are idle for more than the
2227 * specified number of seconds to automatically close. An association
2228 * being idle is defined an association that has NOT sent or received
2229 * user data. The special value of '0' indicates that no automatic
2230 * close of any associations should be performed. The option expects an
2231 * integer defining the number of seconds of idle time before an
2232 * association is closed.
2234 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2235 unsigned int optlen)
2237 struct sctp_sock *sp = sctp_sk(sk);
2238 struct net *net = sock_net(sk);
2240 /* Applicable to UDP-style socket only */
2241 if (sctp_style(sk, TCP))
2243 if (optlen != sizeof(int))
2245 if (copy_from_user(&sp->autoclose, optval, optlen))
2248 if (sp->autoclose > net->sctp.max_autoclose)
2249 sp->autoclose = net->sctp.max_autoclose;
2254 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2256 * Applications can enable or disable heartbeats for any peer address of
2257 * an association, modify an address's heartbeat interval, force a
2258 * heartbeat to be sent immediately, and adjust the address's maximum
2259 * number of retransmissions sent before an address is considered
2260 * unreachable. The following structure is used to access and modify an
2261 * address's parameters:
2263 * struct sctp_paddrparams {
2264 * sctp_assoc_t spp_assoc_id;
2265 * struct sockaddr_storage spp_address;
2266 * uint32_t spp_hbinterval;
2267 * uint16_t spp_pathmaxrxt;
2268 * uint32_t spp_pathmtu;
2269 * uint32_t spp_sackdelay;
2270 * uint32_t spp_flags;
2273 * spp_assoc_id - (one-to-many style socket) This is filled in the
2274 * application, and identifies the association for
2276 * spp_address - This specifies which address is of interest.
2277 * spp_hbinterval - This contains the value of the heartbeat interval,
2278 * in milliseconds. If a value of zero
2279 * is present in this field then no changes are to
2280 * be made to this parameter.
2281 * spp_pathmaxrxt - This contains the maximum number of
2282 * retransmissions before this address shall be
2283 * considered unreachable. If a value of zero
2284 * is present in this field then no changes are to
2285 * be made to this parameter.
2286 * spp_pathmtu - When Path MTU discovery is disabled the value
2287 * specified here will be the "fixed" path mtu.
2288 * Note that if the spp_address field is empty
2289 * then all associations on this address will
2290 * have this fixed path mtu set upon them.
2292 * spp_sackdelay - When delayed sack is enabled, this value specifies
2293 * the number of milliseconds that sacks will be delayed
2294 * for. This value will apply to all addresses of an
2295 * association if the spp_address field is empty. Note
2296 * also, that if delayed sack is enabled and this
2297 * value is set to 0, no change is made to the last
2298 * recorded delayed sack timer value.
2300 * spp_flags - These flags are used to control various features
2301 * on an association. The flag field may contain
2302 * zero or more of the following options.
2304 * SPP_HB_ENABLE - Enable heartbeats on the
2305 * specified address. Note that if the address
2306 * field is empty all addresses for the association
2307 * have heartbeats enabled upon them.
2309 * SPP_HB_DISABLE - Disable heartbeats on the
2310 * speicifed address. Note that if the address
2311 * field is empty all addresses for the association
2312 * will have their heartbeats disabled. Note also
2313 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2314 * mutually exclusive, only one of these two should
2315 * be specified. Enabling both fields will have
2316 * undetermined results.
2318 * SPP_HB_DEMAND - Request a user initiated heartbeat
2319 * to be made immediately.
2321 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2322 * heartbeat delayis to be set to the value of 0
2325 * SPP_PMTUD_ENABLE - This field will enable PMTU
2326 * discovery upon the specified address. Note that
2327 * if the address feild is empty then all addresses
2328 * on the association are effected.
2330 * SPP_PMTUD_DISABLE - This field will disable PMTU
2331 * discovery upon the specified address. Note that
2332 * if the address feild is empty then all addresses
2333 * on the association are effected. Not also that
2334 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2335 * exclusive. Enabling both will have undetermined
2338 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2339 * on delayed sack. The time specified in spp_sackdelay
2340 * is used to specify the sack delay for this address. Note
2341 * that if spp_address is empty then all addresses will
2342 * enable delayed sack and take on the sack delay
2343 * value specified in spp_sackdelay.
2344 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2345 * off delayed sack. If the spp_address field is blank then
2346 * delayed sack is disabled for the entire association. Note
2347 * also that this field is mutually exclusive to
2348 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2351 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2352 struct sctp_transport *trans,
2353 struct sctp_association *asoc,
2354 struct sctp_sock *sp,
2357 int sackdelay_change)
2361 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2362 struct net *net = sock_net(trans->asoc->base.sk);
2364 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2369 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2370 * this field is ignored. Note also that a value of zero indicates
2371 * the current setting should be left unchanged.
2373 if (params->spp_flags & SPP_HB_ENABLE) {
2375 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2376 * set. This lets us use 0 value when this flag
2379 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2380 params->spp_hbinterval = 0;
2382 if (params->spp_hbinterval ||
2383 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2386 msecs_to_jiffies(params->spp_hbinterval);
2389 msecs_to_jiffies(params->spp_hbinterval);
2391 sp->hbinterval = params->spp_hbinterval;
2398 trans->param_flags =
2399 (trans->param_flags & ~SPP_HB) | hb_change;
2402 (asoc->param_flags & ~SPP_HB) | hb_change;
2405 (sp->param_flags & ~SPP_HB) | hb_change;
2409 /* When Path MTU discovery is disabled the value specified here will
2410 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2411 * include the flag SPP_PMTUD_DISABLE for this field to have any
2414 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2416 trans->pathmtu = params->spp_pathmtu;
2417 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2419 asoc->pathmtu = params->spp_pathmtu;
2420 sctp_frag_point(asoc, params->spp_pathmtu);
2422 sp->pathmtu = params->spp_pathmtu;
2428 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2429 (params->spp_flags & SPP_PMTUD_ENABLE);
2430 trans->param_flags =
2431 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2433 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2434 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2438 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2441 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2445 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2446 * value of this field is ignored. Note also that a value of zero
2447 * indicates the current setting should be left unchanged.
2449 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2452 msecs_to_jiffies(params->spp_sackdelay);
2455 msecs_to_jiffies(params->spp_sackdelay);
2457 sp->sackdelay = params->spp_sackdelay;
2461 if (sackdelay_change) {
2463 trans->param_flags =
2464 (trans->param_flags & ~SPP_SACKDELAY) |
2468 (asoc->param_flags & ~SPP_SACKDELAY) |
2472 (sp->param_flags & ~SPP_SACKDELAY) |
2477 /* Note that a value of zero indicates the current setting should be
2480 if (params->spp_pathmaxrxt) {
2482 trans->pathmaxrxt = params->spp_pathmaxrxt;
2484 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2486 sp->pathmaxrxt = params->spp_pathmaxrxt;
2493 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2494 char __user *optval,
2495 unsigned int optlen)
2497 struct sctp_paddrparams params;
2498 struct sctp_transport *trans = NULL;
2499 struct sctp_association *asoc = NULL;
2500 struct sctp_sock *sp = sctp_sk(sk);
2502 int hb_change, pmtud_change, sackdelay_change;
2504 if (optlen != sizeof(struct sctp_paddrparams))
2507 if (copy_from_user(¶ms, optval, optlen))
2510 /* Validate flags and value parameters. */
2511 hb_change = params.spp_flags & SPP_HB;
2512 pmtud_change = params.spp_flags & SPP_PMTUD;
2513 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2515 if (hb_change == SPP_HB ||
2516 pmtud_change == SPP_PMTUD ||
2517 sackdelay_change == SPP_SACKDELAY ||
2518 params.spp_sackdelay > 500 ||
2519 (params.spp_pathmtu &&
2520 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2523 /* If an address other than INADDR_ANY is specified, and
2524 * no transport is found, then the request is invalid.
2526 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2527 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2528 params.spp_assoc_id);
2533 /* Get association, if assoc_id != 0 and the socket is a one
2534 * to many style socket, and an association was not found, then
2535 * the id was invalid.
2537 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2538 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2541 /* Heartbeat demand can only be sent on a transport or
2542 * association, but not a socket.
2544 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2547 /* Process parameters. */
2548 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2549 hb_change, pmtud_change,
2555 /* If changes are for association, also apply parameters to each
2558 if (!trans && asoc) {
2559 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2561 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2562 hb_change, pmtud_change,
2570 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2572 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2575 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2577 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2581 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2583 * This option will effect the way delayed acks are performed. This
2584 * option allows you to get or set the delayed ack time, in
2585 * milliseconds. It also allows changing the delayed ack frequency.
2586 * Changing the frequency to 1 disables the delayed sack algorithm. If
2587 * the assoc_id is 0, then this sets or gets the endpoints default
2588 * values. If the assoc_id field is non-zero, then the set or get
2589 * effects the specified association for the one to many model (the
2590 * assoc_id field is ignored by the one to one model). Note that if
2591 * sack_delay or sack_freq are 0 when setting this option, then the
2592 * current values will remain unchanged.
2594 * struct sctp_sack_info {
2595 * sctp_assoc_t sack_assoc_id;
2596 * uint32_t sack_delay;
2597 * uint32_t sack_freq;
2600 * sack_assoc_id - This parameter, indicates which association the user
2601 * is performing an action upon. Note that if this field's value is
2602 * zero then the endpoints default value is changed (effecting future
2603 * associations only).
2605 * sack_delay - This parameter contains the number of milliseconds that
2606 * the user is requesting the delayed ACK timer be set to. Note that
2607 * this value is defined in the standard to be between 200 and 500
2610 * sack_freq - This parameter contains the number of packets that must
2611 * be received before a sack is sent without waiting for the delay
2612 * timer to expire. The default value for this is 2, setting this
2613 * value to 1 will disable the delayed sack algorithm.
2616 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2617 char __user *optval, unsigned int optlen)
2619 struct sctp_sack_info params;
2620 struct sctp_transport *trans = NULL;
2621 struct sctp_association *asoc = NULL;
2622 struct sctp_sock *sp = sctp_sk(sk);
2624 if (optlen == sizeof(struct sctp_sack_info)) {
2625 if (copy_from_user(¶ms, optval, optlen))
2628 if (params.sack_delay == 0 && params.sack_freq == 0)
2630 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2631 pr_warn_ratelimited(DEPRECATED
2633 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2634 "Use struct sctp_sack_info instead\n",
2635 current->comm, task_pid_nr(current));
2636 if (copy_from_user(¶ms, optval, optlen))
2639 if (params.sack_delay == 0)
2640 params.sack_freq = 1;
2642 params.sack_freq = 0;
2646 /* Validate value parameter. */
2647 if (params.sack_delay > 500)
2650 /* Get association, if sack_assoc_id != 0 and the socket is a one
2651 * to many style socket, and an association was not found, then
2652 * the id was invalid.
2654 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2655 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2658 if (params.sack_delay) {
2661 msecs_to_jiffies(params.sack_delay);
2663 sctp_spp_sackdelay_enable(asoc->param_flags);
2665 sp->sackdelay = params.sack_delay;
2667 sctp_spp_sackdelay_enable(sp->param_flags);
2671 if (params.sack_freq == 1) {
2674 sctp_spp_sackdelay_disable(asoc->param_flags);
2677 sctp_spp_sackdelay_disable(sp->param_flags);
2679 } else if (params.sack_freq > 1) {
2681 asoc->sackfreq = params.sack_freq;
2683 sctp_spp_sackdelay_enable(asoc->param_flags);
2685 sp->sackfreq = params.sack_freq;
2687 sctp_spp_sackdelay_enable(sp->param_flags);
2691 /* If change is for association, also apply to each transport. */
2693 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2695 if (params.sack_delay) {
2697 msecs_to_jiffies(params.sack_delay);
2698 trans->param_flags =
2699 sctp_spp_sackdelay_enable(trans->param_flags);
2701 if (params.sack_freq == 1) {
2702 trans->param_flags =
2703 sctp_spp_sackdelay_disable(trans->param_flags);
2704 } else if (params.sack_freq > 1) {
2705 trans->sackfreq = params.sack_freq;
2706 trans->param_flags =
2707 sctp_spp_sackdelay_enable(trans->param_flags);
2715 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2717 * Applications can specify protocol parameters for the default association
2718 * initialization. The option name argument to setsockopt() and getsockopt()
2721 * Setting initialization parameters is effective only on an unconnected
2722 * socket (for UDP-style sockets only future associations are effected
2723 * by the change). With TCP-style sockets, this option is inherited by
2724 * sockets derived from a listener socket.
2726 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2728 struct sctp_initmsg sinit;
2729 struct sctp_sock *sp = sctp_sk(sk);
2731 if (optlen != sizeof(struct sctp_initmsg))
2733 if (copy_from_user(&sinit, optval, optlen))
2736 if (sinit.sinit_num_ostreams)
2737 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2738 if (sinit.sinit_max_instreams)
2739 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2740 if (sinit.sinit_max_attempts)
2741 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2742 if (sinit.sinit_max_init_timeo)
2743 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2749 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2751 * Applications that wish to use the sendto() system call may wish to
2752 * specify a default set of parameters that would normally be supplied
2753 * through the inclusion of ancillary data. This socket option allows
2754 * such an application to set the default sctp_sndrcvinfo structure.
2755 * The application that wishes to use this socket option simply passes
2756 * in to this call the sctp_sndrcvinfo structure defined in Section
2757 * 5.2.2) The input parameters accepted by this call include
2758 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2759 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2760 * to this call if the caller is using the UDP model.
2762 static int sctp_setsockopt_default_send_param(struct sock *sk,
2763 char __user *optval,
2764 unsigned int optlen)
2766 struct sctp_sock *sp = sctp_sk(sk);
2767 struct sctp_association *asoc;
2768 struct sctp_sndrcvinfo info;
2770 if (optlen != sizeof(info))
2772 if (copy_from_user(&info, optval, optlen))
2774 if (info.sinfo_flags &
2775 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2776 SCTP_ABORT | SCTP_EOF))
2779 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2780 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2783 asoc->default_stream = info.sinfo_stream;
2784 asoc->default_flags = info.sinfo_flags;
2785 asoc->default_ppid = info.sinfo_ppid;
2786 asoc->default_context = info.sinfo_context;
2787 asoc->default_timetolive = info.sinfo_timetolive;
2789 sp->default_stream = info.sinfo_stream;
2790 sp->default_flags = info.sinfo_flags;
2791 sp->default_ppid = info.sinfo_ppid;
2792 sp->default_context = info.sinfo_context;
2793 sp->default_timetolive = info.sinfo_timetolive;
2799 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2800 * (SCTP_DEFAULT_SNDINFO)
2802 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2803 char __user *optval,
2804 unsigned int optlen)
2806 struct sctp_sock *sp = sctp_sk(sk);
2807 struct sctp_association *asoc;
2808 struct sctp_sndinfo info;
2810 if (optlen != sizeof(info))
2812 if (copy_from_user(&info, optval, optlen))
2814 if (info.snd_flags &
2815 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2816 SCTP_ABORT | SCTP_EOF))
2819 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2820 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2823 asoc->default_stream = info.snd_sid;
2824 asoc->default_flags = info.snd_flags;
2825 asoc->default_ppid = info.snd_ppid;
2826 asoc->default_context = info.snd_context;
2828 sp->default_stream = info.snd_sid;
2829 sp->default_flags = info.snd_flags;
2830 sp->default_ppid = info.snd_ppid;
2831 sp->default_context = info.snd_context;
2837 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2839 * Requests that the local SCTP stack use the enclosed peer address as
2840 * the association primary. The enclosed address must be one of the
2841 * association peer's addresses.
2843 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2844 unsigned int optlen)
2846 struct sctp_prim prim;
2847 struct sctp_transport *trans;
2849 if (optlen != sizeof(struct sctp_prim))
2852 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2855 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2859 sctp_assoc_set_primary(trans->asoc, trans);
2865 * 7.1.5 SCTP_NODELAY
2867 * Turn on/off any Nagle-like algorithm. This means that packets are
2868 * generally sent as soon as possible and no unnecessary delays are
2869 * introduced, at the cost of more packets in the network. Expects an
2870 * integer boolean flag.
2872 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2873 unsigned int optlen)
2877 if (optlen < sizeof(int))
2879 if (get_user(val, (int __user *)optval))
2882 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2888 * 7.1.1 SCTP_RTOINFO
2890 * The protocol parameters used to initialize and bound retransmission
2891 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2892 * and modify these parameters.
2893 * All parameters are time values, in milliseconds. A value of 0, when
2894 * modifying the parameters, indicates that the current value should not
2898 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2900 struct sctp_rtoinfo rtoinfo;
2901 struct sctp_association *asoc;
2902 unsigned long rto_min, rto_max;
2903 struct sctp_sock *sp = sctp_sk(sk);
2905 if (optlen != sizeof (struct sctp_rtoinfo))
2908 if (copy_from_user(&rtoinfo, optval, optlen))
2911 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2913 /* Set the values to the specific association */
2914 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2917 rto_max = rtoinfo.srto_max;
2918 rto_min = rtoinfo.srto_min;
2921 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2923 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2926 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2928 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2930 if (rto_min > rto_max)
2934 if (rtoinfo.srto_initial != 0)
2936 msecs_to_jiffies(rtoinfo.srto_initial);
2937 asoc->rto_max = rto_max;
2938 asoc->rto_min = rto_min;
2940 /* If there is no association or the association-id = 0
2941 * set the values to the endpoint.
2943 if (rtoinfo.srto_initial != 0)
2944 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2945 sp->rtoinfo.srto_max = rto_max;
2946 sp->rtoinfo.srto_min = rto_min;
2954 * 7.1.2 SCTP_ASSOCINFO
2956 * This option is used to tune the maximum retransmission attempts
2957 * of the association.
2958 * Returns an error if the new association retransmission value is
2959 * greater than the sum of the retransmission value of the peer.
2960 * See [SCTP] for more information.
2963 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2966 struct sctp_assocparams assocparams;
2967 struct sctp_association *asoc;
2969 if (optlen != sizeof(struct sctp_assocparams))
2971 if (copy_from_user(&assocparams, optval, optlen))
2974 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2976 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2979 /* Set the values to the specific association */
2981 if (assocparams.sasoc_asocmaxrxt != 0) {
2984 struct sctp_transport *peer_addr;
2986 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2988 path_sum += peer_addr->pathmaxrxt;
2992 /* Only validate asocmaxrxt if we have more than
2993 * one path/transport. We do this because path
2994 * retransmissions are only counted when we have more
2998 assocparams.sasoc_asocmaxrxt > path_sum)
3001 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3004 if (assocparams.sasoc_cookie_life != 0)
3005 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3007 /* Set the values to the endpoint */
3008 struct sctp_sock *sp = sctp_sk(sk);
3010 if (assocparams.sasoc_asocmaxrxt != 0)
3011 sp->assocparams.sasoc_asocmaxrxt =
3012 assocparams.sasoc_asocmaxrxt;
3013 if (assocparams.sasoc_cookie_life != 0)
3014 sp->assocparams.sasoc_cookie_life =
3015 assocparams.sasoc_cookie_life;
3021 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3023 * This socket option is a boolean flag which turns on or off mapped V4
3024 * addresses. If this option is turned on and the socket is type
3025 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3026 * If this option is turned off, then no mapping will be done of V4
3027 * addresses and a user will receive both PF_INET6 and PF_INET type
3028 * addresses on the socket.
3030 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3033 struct sctp_sock *sp = sctp_sk(sk);
3035 if (optlen < sizeof(int))
3037 if (get_user(val, (int __user *)optval))
3048 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3049 * This option will get or set the maximum size to put in any outgoing
3050 * SCTP DATA chunk. If a message is larger than this size it will be
3051 * fragmented by SCTP into the specified size. Note that the underlying
3052 * SCTP implementation may fragment into smaller sized chunks when the
3053 * PMTU of the underlying association is smaller than the value set by
3054 * the user. The default value for this option is '0' which indicates
3055 * the user is NOT limiting fragmentation and only the PMTU will effect
3056 * SCTP's choice of DATA chunk size. Note also that values set larger
3057 * than the maximum size of an IP datagram will effectively let SCTP
3058 * control fragmentation (i.e. the same as setting this option to 0).
3060 * The following structure is used to access and modify this parameter:
3062 * struct sctp_assoc_value {
3063 * sctp_assoc_t assoc_id;
3064 * uint32_t assoc_value;
3067 * assoc_id: This parameter is ignored for one-to-one style sockets.
3068 * For one-to-many style sockets this parameter indicates which
3069 * association the user is performing an action upon. Note that if
3070 * this field's value is zero then the endpoints default value is
3071 * changed (effecting future associations only).
3072 * assoc_value: This parameter specifies the maximum size in bytes.
3074 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3076 struct sctp_assoc_value params;
3077 struct sctp_association *asoc;
3078 struct sctp_sock *sp = sctp_sk(sk);
3081 if (optlen == sizeof(int)) {
3082 pr_warn_ratelimited(DEPRECATED
3084 "Use of int in maxseg socket option.\n"
3085 "Use struct sctp_assoc_value instead\n",
3086 current->comm, task_pid_nr(current));
3087 if (copy_from_user(&val, optval, optlen))
3089 params.assoc_id = 0;
3090 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3091 if (copy_from_user(¶ms, optval, optlen))
3093 val = params.assoc_value;
3097 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3100 asoc = sctp_id2assoc(sk, params.assoc_id);
3101 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3106 val = asoc->pathmtu;
3107 val -= sp->pf->af->net_header_len;
3108 val -= sizeof(struct sctphdr) +
3109 sizeof(struct sctp_data_chunk);
3111 asoc->user_frag = val;
3112 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3114 sp->user_frag = val;
3122 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3124 * Requests that the peer mark the enclosed address as the association
3125 * primary. The enclosed address must be one of the association's
3126 * locally bound addresses. The following structure is used to make a
3127 * set primary request:
3129 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3130 unsigned int optlen)
3132 struct net *net = sock_net(sk);
3133 struct sctp_sock *sp;
3134 struct sctp_association *asoc = NULL;
3135 struct sctp_setpeerprim prim;
3136 struct sctp_chunk *chunk;
3142 if (!net->sctp.addip_enable)
3145 if (optlen != sizeof(struct sctp_setpeerprim))
3148 if (copy_from_user(&prim, optval, optlen))
3151 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3155 if (!asoc->peer.asconf_capable)
3158 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3161 if (!sctp_state(asoc, ESTABLISHED))
3164 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3168 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3169 return -EADDRNOTAVAIL;
3171 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3172 return -EADDRNOTAVAIL;
3174 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3175 chunk = sctp_make_asconf_set_prim(asoc,
3176 (union sctp_addr *)&prim.sspp_addr);
3180 err = sctp_send_asconf(asoc, chunk);
3182 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3187 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3188 unsigned int optlen)
3190 struct sctp_setadaptation adaptation;
3192 if (optlen != sizeof(struct sctp_setadaptation))
3194 if (copy_from_user(&adaptation, optval, optlen))
3197 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3203 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3205 * The context field in the sctp_sndrcvinfo structure is normally only
3206 * used when a failed message is retrieved holding the value that was
3207 * sent down on the actual send call. This option allows the setting of
3208 * a default context on an association basis that will be received on
3209 * reading messages from the peer. This is especially helpful in the
3210 * one-2-many model for an application to keep some reference to an
3211 * internal state machine that is processing messages on the
3212 * association. Note that the setting of this value only effects
3213 * received messages from the peer and does not effect the value that is
3214 * saved with outbound messages.
3216 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3217 unsigned int optlen)
3219 struct sctp_assoc_value params;
3220 struct sctp_sock *sp;
3221 struct sctp_association *asoc;
3223 if (optlen != sizeof(struct sctp_assoc_value))
3225 if (copy_from_user(¶ms, optval, optlen))
3230 if (params.assoc_id != 0) {
3231 asoc = sctp_id2assoc(sk, params.assoc_id);
3234 asoc->default_rcv_context = params.assoc_value;
3236 sp->default_rcv_context = params.assoc_value;
3243 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3245 * This options will at a minimum specify if the implementation is doing
3246 * fragmented interleave. Fragmented interleave, for a one to many
3247 * socket, is when subsequent calls to receive a message may return
3248 * parts of messages from different associations. Some implementations
3249 * may allow you to turn this value on or off. If so, when turned off,
3250 * no fragment interleave will occur (which will cause a head of line
3251 * blocking amongst multiple associations sharing the same one to many
3252 * socket). When this option is turned on, then each receive call may
3253 * come from a different association (thus the user must receive data
3254 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3255 * association each receive belongs to.
3257 * This option takes a boolean value. A non-zero value indicates that
3258 * fragmented interleave is on. A value of zero indicates that
3259 * fragmented interleave is off.
3261 * Note that it is important that an implementation that allows this
3262 * option to be turned on, have it off by default. Otherwise an unaware
3263 * application using the one to many model may become confused and act
3266 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3267 char __user *optval,
3268 unsigned int optlen)
3272 if (optlen != sizeof(int))
3274 if (get_user(val, (int __user *)optval))
3277 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3283 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3284 * (SCTP_PARTIAL_DELIVERY_POINT)
3286 * This option will set or get the SCTP partial delivery point. This
3287 * point is the size of a message where the partial delivery API will be
3288 * invoked to help free up rwnd space for the peer. Setting this to a
3289 * lower value will cause partial deliveries to happen more often. The
3290 * calls argument is an integer that sets or gets the partial delivery
3291 * point. Note also that the call will fail if the user attempts to set
3292 * this value larger than the socket receive buffer size.
3294 * Note that any single message having a length smaller than or equal to
3295 * the SCTP partial delivery point will be delivered in one single read
3296 * call as long as the user provided buffer is large enough to hold the
3299 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3300 char __user *optval,
3301 unsigned int optlen)
3305 if (optlen != sizeof(u32))
3307 if (get_user(val, (int __user *)optval))
3310 /* Note: We double the receive buffer from what the user sets
3311 * it to be, also initial rwnd is based on rcvbuf/2.
3313 if (val > (sk->sk_rcvbuf >> 1))
3316 sctp_sk(sk)->pd_point = val;
3318 return 0; /* is this the right error code? */
3322 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3324 * This option will allow a user to change the maximum burst of packets
3325 * that can be emitted by this association. Note that the default value
3326 * is 4, and some implementations may restrict this setting so that it
3327 * can only be lowered.
3329 * NOTE: This text doesn't seem right. Do this on a socket basis with
3330 * future associations inheriting the socket value.
3332 static int sctp_setsockopt_maxburst(struct sock *sk,
3333 char __user *optval,
3334 unsigned int optlen)
3336 struct sctp_assoc_value params;
3337 struct sctp_sock *sp;
3338 struct sctp_association *asoc;
3342 if (optlen == sizeof(int)) {
3343 pr_warn_ratelimited(DEPRECATED
3345 "Use of int in max_burst socket option deprecated.\n"
3346 "Use struct sctp_assoc_value instead\n",
3347 current->comm, task_pid_nr(current));
3348 if (copy_from_user(&val, optval, optlen))
3350 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3351 if (copy_from_user(¶ms, optval, optlen))
3353 val = params.assoc_value;
3354 assoc_id = params.assoc_id;
3360 if (assoc_id != 0) {
3361 asoc = sctp_id2assoc(sk, assoc_id);
3364 asoc->max_burst = val;
3366 sp->max_burst = val;
3372 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3374 * This set option adds a chunk type that the user is requesting to be
3375 * received only in an authenticated way. Changes to the list of chunks
3376 * will only effect future associations on the socket.
3378 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3379 char __user *optval,
3380 unsigned int optlen)
3382 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3383 struct sctp_authchunk val;
3385 if (!ep->auth_enable)
3388 if (optlen != sizeof(struct sctp_authchunk))
3390 if (copy_from_user(&val, optval, optlen))
3393 switch (val.sauth_chunk) {
3395 case SCTP_CID_INIT_ACK:
3396 case SCTP_CID_SHUTDOWN_COMPLETE:
3401 /* add this chunk id to the endpoint */
3402 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3406 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3408 * This option gets or sets the list of HMAC algorithms that the local
3409 * endpoint requires the peer to use.
3411 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3412 char __user *optval,
3413 unsigned int optlen)
3415 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3416 struct sctp_hmacalgo *hmacs;
3420 if (!ep->auth_enable)
3423 if (optlen < sizeof(struct sctp_hmacalgo))
3426 hmacs = memdup_user(optval, optlen);
3428 return PTR_ERR(hmacs);
3430 idents = hmacs->shmac_num_idents;
3431 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3432 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3437 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3444 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3446 * This option will set a shared secret key which is used to build an
3447 * association shared key.
3449 static int sctp_setsockopt_auth_key(struct sock *sk,
3450 char __user *optval,
3451 unsigned int optlen)
3453 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3454 struct sctp_authkey *authkey;
3455 struct sctp_association *asoc;
3458 if (!ep->auth_enable)
3461 if (optlen <= sizeof(struct sctp_authkey))
3464 authkey = memdup_user(optval, optlen);
3465 if (IS_ERR(authkey))
3466 return PTR_ERR(authkey);
3468 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3473 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3474 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3479 ret = sctp_auth_set_key(ep, asoc, authkey);
3486 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3488 * This option will get or set the active shared key to be used to build
3489 * the association shared key.
3491 static int sctp_setsockopt_active_key(struct sock *sk,
3492 char __user *optval,
3493 unsigned int optlen)
3495 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3496 struct sctp_authkeyid val;
3497 struct sctp_association *asoc;
3499 if (!ep->auth_enable)
3502 if (optlen != sizeof(struct sctp_authkeyid))
3504 if (copy_from_user(&val, optval, optlen))
3507 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3508 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3511 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3515 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3517 * This set option will delete a shared secret key from use.
3519 static int sctp_setsockopt_del_key(struct sock *sk,
3520 char __user *optval,
3521 unsigned int optlen)
3523 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3524 struct sctp_authkeyid val;
3525 struct sctp_association *asoc;
3527 if (!ep->auth_enable)
3530 if (optlen != sizeof(struct sctp_authkeyid))
3532 if (copy_from_user(&val, optval, optlen))
3535 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3536 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3539 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3544 * 8.1.23 SCTP_AUTO_ASCONF
3546 * This option will enable or disable the use of the automatic generation of
3547 * ASCONF chunks to add and delete addresses to an existing association. Note
3548 * that this option has two caveats namely: a) it only affects sockets that
3549 * are bound to all addresses available to the SCTP stack, and b) the system
3550 * administrator may have an overriding control that turns the ASCONF feature
3551 * off no matter what setting the socket option may have.
3552 * This option expects an integer boolean flag, where a non-zero value turns on
3553 * the option, and a zero value turns off the option.
3554 * Note. In this implementation, socket operation overrides default parameter
3555 * being set by sysctl as well as FreeBSD implementation
3557 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3558 unsigned int optlen)
3561 struct sctp_sock *sp = sctp_sk(sk);
3563 if (optlen < sizeof(int))
3565 if (get_user(val, (int __user *)optval))
3567 if (!sctp_is_ep_boundall(sk) && val)
3569 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3572 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3573 if (val == 0 && sp->do_auto_asconf) {
3574 list_del(&sp->auto_asconf_list);
3575 sp->do_auto_asconf = 0;
3576 } else if (val && !sp->do_auto_asconf) {
3577 list_add_tail(&sp->auto_asconf_list,
3578 &sock_net(sk)->sctp.auto_asconf_splist);
3579 sp->do_auto_asconf = 1;
3581 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3586 * SCTP_PEER_ADDR_THLDS
3588 * This option allows us to alter the partially failed threshold for one or all
3589 * transports in an association. See Section 6.1 of:
3590 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3592 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3593 char __user *optval,
3594 unsigned int optlen)
3596 struct sctp_paddrthlds val;
3597 struct sctp_transport *trans;
3598 struct sctp_association *asoc;
3600 if (optlen < sizeof(struct sctp_paddrthlds))
3602 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3603 sizeof(struct sctp_paddrthlds)))
3607 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3608 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3611 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3613 if (val.spt_pathmaxrxt)
3614 trans->pathmaxrxt = val.spt_pathmaxrxt;
3615 trans->pf_retrans = val.spt_pathpfthld;
3618 if (val.spt_pathmaxrxt)
3619 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3620 asoc->pf_retrans = val.spt_pathpfthld;
3622 trans = sctp_addr_id2transport(sk, &val.spt_address,
3627 if (val.spt_pathmaxrxt)
3628 trans->pathmaxrxt = val.spt_pathmaxrxt;
3629 trans->pf_retrans = val.spt_pathpfthld;
3635 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3636 char __user *optval,
3637 unsigned int optlen)
3641 if (optlen < sizeof(int))
3643 if (get_user(val, (int __user *) optval))
3646 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3651 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3652 char __user *optval,
3653 unsigned int optlen)
3657 if (optlen < sizeof(int))
3659 if (get_user(val, (int __user *) optval))
3662 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3667 /* API 6.2 setsockopt(), getsockopt()
3669 * Applications use setsockopt() and getsockopt() to set or retrieve
3670 * socket options. Socket options are used to change the default
3671 * behavior of sockets calls. They are described in Section 7.
3675 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3676 * int __user *optlen);
3677 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3680 * sd - the socket descript.
3681 * level - set to IPPROTO_SCTP for all SCTP options.
3682 * optname - the option name.
3683 * optval - the buffer to store the value of the option.
3684 * optlen - the size of the buffer.
3686 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3687 char __user *optval, unsigned int optlen)
3691 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3693 /* I can hardly begin to describe how wrong this is. This is
3694 * so broken as to be worse than useless. The API draft
3695 * REALLY is NOT helpful here... I am not convinced that the
3696 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3697 * are at all well-founded.
3699 if (level != SOL_SCTP) {
3700 struct sctp_af *af = sctp_sk(sk)->pf->af;
3701 retval = af->setsockopt(sk, level, optname, optval, optlen);
3708 case SCTP_SOCKOPT_BINDX_ADD:
3709 /* 'optlen' is the size of the addresses buffer. */
3710 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3711 optlen, SCTP_BINDX_ADD_ADDR);
3714 case SCTP_SOCKOPT_BINDX_REM:
3715 /* 'optlen' is the size of the addresses buffer. */
3716 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3717 optlen, SCTP_BINDX_REM_ADDR);
3720 case SCTP_SOCKOPT_CONNECTX_OLD:
3721 /* 'optlen' is the size of the addresses buffer. */
3722 retval = sctp_setsockopt_connectx_old(sk,
3723 (struct sockaddr __user *)optval,
3727 case SCTP_SOCKOPT_CONNECTX:
3728 /* 'optlen' is the size of the addresses buffer. */
3729 retval = sctp_setsockopt_connectx(sk,
3730 (struct sockaddr __user *)optval,
3734 case SCTP_DISABLE_FRAGMENTS:
3735 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3739 retval = sctp_setsockopt_events(sk, optval, optlen);
3742 case SCTP_AUTOCLOSE:
3743 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3746 case SCTP_PEER_ADDR_PARAMS:
3747 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3750 case SCTP_DELAYED_SACK:
3751 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3753 case SCTP_PARTIAL_DELIVERY_POINT:
3754 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3758 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3760 case SCTP_DEFAULT_SEND_PARAM:
3761 retval = sctp_setsockopt_default_send_param(sk, optval,
3764 case SCTP_DEFAULT_SNDINFO:
3765 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3767 case SCTP_PRIMARY_ADDR:
3768 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3770 case SCTP_SET_PEER_PRIMARY_ADDR:
3771 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3774 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3777 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3779 case SCTP_ASSOCINFO:
3780 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3782 case SCTP_I_WANT_MAPPED_V4_ADDR:
3783 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3786 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3788 case SCTP_ADAPTATION_LAYER:
3789 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3792 retval = sctp_setsockopt_context(sk, optval, optlen);
3794 case SCTP_FRAGMENT_INTERLEAVE:
3795 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3797 case SCTP_MAX_BURST:
3798 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3800 case SCTP_AUTH_CHUNK:
3801 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3803 case SCTP_HMAC_IDENT:
3804 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3807 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3809 case SCTP_AUTH_ACTIVE_KEY:
3810 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3812 case SCTP_AUTH_DELETE_KEY:
3813 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3815 case SCTP_AUTO_ASCONF:
3816 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3818 case SCTP_PEER_ADDR_THLDS:
3819 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3821 case SCTP_RECVRCVINFO:
3822 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3824 case SCTP_RECVNXTINFO:
3825 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3828 retval = -ENOPROTOOPT;
3838 /* API 3.1.6 connect() - UDP Style Syntax
3840 * An application may use the connect() call in the UDP model to initiate an
3841 * association without sending data.
3845 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3847 * sd: the socket descriptor to have a new association added to.
3849 * nam: the address structure (either struct sockaddr_in or struct
3850 * sockaddr_in6 defined in RFC2553 [7]).
3852 * len: the size of the address.
3854 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3862 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3865 /* Validate addr_len before calling common connect/connectx routine. */
3866 af = sctp_get_af_specific(addr->sa_family);
3867 if (!af || addr_len < af->sockaddr_len) {
3870 /* Pass correct addr len to common routine (so it knows there
3871 * is only one address being passed.
3873 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3880 /* FIXME: Write comments. */
3881 static int sctp_disconnect(struct sock *sk, int flags)
3883 return -EOPNOTSUPP; /* STUB */
3886 /* 4.1.4 accept() - TCP Style Syntax
3888 * Applications use accept() call to remove an established SCTP
3889 * association from the accept queue of the endpoint. A new socket
3890 * descriptor will be returned from accept() to represent the newly
3891 * formed association.
3893 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3895 struct sctp_sock *sp;
3896 struct sctp_endpoint *ep;
3897 struct sock *newsk = NULL;
3898 struct sctp_association *asoc;
3907 if (!sctp_style(sk, TCP)) {
3908 error = -EOPNOTSUPP;
3912 if (!sctp_sstate(sk, LISTENING)) {
3917 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3919 error = sctp_wait_for_accept(sk, timeo);
3923 /* We treat the list of associations on the endpoint as the accept
3924 * queue and pick the first association on the list.
3926 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3928 newsk = sp->pf->create_accept_sk(sk, asoc);
3934 /* Populate the fields of the newsk from the oldsk and migrate the
3935 * asoc to the newsk.
3937 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3945 /* The SCTP ioctl handler. */
3946 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3953 * SEQPACKET-style sockets in LISTENING state are valid, for
3954 * SCTP, so only discard TCP-style sockets in LISTENING state.
3956 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3961 struct sk_buff *skb;
3962 unsigned int amount = 0;
3964 skb = skb_peek(&sk->sk_receive_queue);
3967 * We will only return the amount of this packet since
3968 * that is all that will be read.
3972 rc = put_user(amount, (int __user *)arg);
3984 /* This is the function which gets called during socket creation to
3985 * initialized the SCTP-specific portion of the sock.
3986 * The sock structure should already be zero-filled memory.
3988 static int sctp_init_sock(struct sock *sk)
3990 struct net *net = sock_net(sk);
3991 struct sctp_sock *sp;
3993 pr_debug("%s: sk:%p\n", __func__, sk);
3997 /* Initialize the SCTP per socket area. */
3998 switch (sk->sk_type) {
3999 case SOCK_SEQPACKET:
4000 sp->type = SCTP_SOCKET_UDP;
4003 sp->type = SCTP_SOCKET_TCP;
4006 return -ESOCKTNOSUPPORT;
4009 /* Initialize default send parameters. These parameters can be
4010 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4012 sp->default_stream = 0;
4013 sp->default_ppid = 0;
4014 sp->default_flags = 0;
4015 sp->default_context = 0;
4016 sp->default_timetolive = 0;
4018 sp->default_rcv_context = 0;
4019 sp->max_burst = net->sctp.max_burst;
4021 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4023 /* Initialize default setup parameters. These parameters
4024 * can be modified with the SCTP_INITMSG socket option or
4025 * overridden by the SCTP_INIT CMSG.
4027 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4028 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4029 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4030 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4032 /* Initialize default RTO related parameters. These parameters can
4033 * be modified for with the SCTP_RTOINFO socket option.
4035 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4036 sp->rtoinfo.srto_max = net->sctp.rto_max;
4037 sp->rtoinfo.srto_min = net->sctp.rto_min;
4039 /* Initialize default association related parameters. These parameters
4040 * can be modified with the SCTP_ASSOCINFO socket option.
4042 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4043 sp->assocparams.sasoc_number_peer_destinations = 0;
4044 sp->assocparams.sasoc_peer_rwnd = 0;
4045 sp->assocparams.sasoc_local_rwnd = 0;
4046 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4048 /* Initialize default event subscriptions. By default, all the
4051 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4053 /* Default Peer Address Parameters. These defaults can
4054 * be modified via SCTP_PEER_ADDR_PARAMS
4056 sp->hbinterval = net->sctp.hb_interval;
4057 sp->pathmaxrxt = net->sctp.max_retrans_path;
4058 sp->pathmtu = 0; /* allow default discovery */
4059 sp->sackdelay = net->sctp.sack_timeout;
4061 sp->param_flags = SPP_HB_ENABLE |
4063 SPP_SACKDELAY_ENABLE;
4065 /* If enabled no SCTP message fragmentation will be performed.
4066 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4068 sp->disable_fragments = 0;
4070 /* Enable Nagle algorithm by default. */
4073 sp->recvrcvinfo = 0;
4074 sp->recvnxtinfo = 0;
4076 /* Enable by default. */
4079 /* Auto-close idle associations after the configured
4080 * number of seconds. A value of 0 disables this
4081 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4082 * for UDP-style sockets only.
4086 /* User specified fragmentation limit. */
4089 sp->adaptation_ind = 0;
4091 sp->pf = sctp_get_pf_specific(sk->sk_family);
4093 /* Control variables for partial data delivery. */
4094 atomic_set(&sp->pd_mode, 0);
4095 skb_queue_head_init(&sp->pd_lobby);
4096 sp->frag_interleave = 0;
4098 /* Create a per socket endpoint structure. Even if we
4099 * change the data structure relationships, this may still
4100 * be useful for storing pre-connect address information.
4102 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4108 sk->sk_destruct = sctp_destruct_sock;
4110 SCTP_DBG_OBJCNT_INC(sock);
4113 percpu_counter_inc(&sctp_sockets_allocated);
4114 sock_prot_inuse_add(net, sk->sk_prot, 1);
4116 /* Nothing can fail after this block, otherwise
4117 * sctp_destroy_sock() will be called without addr_wq_lock held
4119 if (net->sctp.default_auto_asconf) {
4120 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4121 list_add_tail(&sp->auto_asconf_list,
4122 &net->sctp.auto_asconf_splist);
4123 sp->do_auto_asconf = 1;
4124 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4126 sp->do_auto_asconf = 0;
4134 /* Cleanup any SCTP per socket resources. Must be called with
4135 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4137 static void sctp_destroy_sock(struct sock *sk)
4139 struct sctp_sock *sp;
4141 pr_debug("%s: sk:%p\n", __func__, sk);
4143 /* Release our hold on the endpoint. */
4145 /* This could happen during socket init, thus we bail out
4146 * early, since the rest of the below is not setup either.
4151 if (sp->do_auto_asconf) {
4152 sp->do_auto_asconf = 0;
4153 list_del(&sp->auto_asconf_list);
4155 sctp_endpoint_free(sp->ep);
4157 percpu_counter_dec(&sctp_sockets_allocated);
4158 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4162 /* Triggered when there are no references on the socket anymore */
4163 static void sctp_destruct_sock(struct sock *sk)
4165 struct sctp_sock *sp = sctp_sk(sk);
4167 /* Free up the HMAC transform. */
4168 crypto_free_hash(sp->hmac);
4170 inet_sock_destruct(sk);
4173 /* API 4.1.7 shutdown() - TCP Style Syntax
4174 * int shutdown(int socket, int how);
4176 * sd - the socket descriptor of the association to be closed.
4177 * how - Specifies the type of shutdown. The values are
4180 * Disables further receive operations. No SCTP
4181 * protocol action is taken.
4183 * Disables further send operations, and initiates
4184 * the SCTP shutdown sequence.
4186 * Disables further send and receive operations
4187 * and initiates the SCTP shutdown sequence.
4189 static void sctp_shutdown(struct sock *sk, int how)
4191 struct net *net = sock_net(sk);
4192 struct sctp_endpoint *ep;
4193 struct sctp_association *asoc;
4195 if (!sctp_style(sk, TCP))
4198 if (how & SEND_SHUTDOWN) {
4199 ep = sctp_sk(sk)->ep;
4200 if (!list_empty(&ep->asocs)) {
4201 asoc = list_entry(ep->asocs.next,
4202 struct sctp_association, asocs);
4203 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4208 /* 7.2.1 Association Status (SCTP_STATUS)
4210 * Applications can retrieve current status information about an
4211 * association, including association state, peer receiver window size,
4212 * number of unacked data chunks, and number of data chunks pending
4213 * receipt. This information is read-only.
4215 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4216 char __user *optval,
4219 struct sctp_status status;
4220 struct sctp_association *asoc = NULL;
4221 struct sctp_transport *transport;
4222 sctp_assoc_t associd;
4225 if (len < sizeof(status)) {
4230 len = sizeof(status);
4231 if (copy_from_user(&status, optval, len)) {
4236 associd = status.sstat_assoc_id;
4237 asoc = sctp_id2assoc(sk, associd);
4243 transport = asoc->peer.primary_path;
4245 status.sstat_assoc_id = sctp_assoc2id(asoc);
4246 status.sstat_state = sctp_assoc_to_state(asoc);
4247 status.sstat_rwnd = asoc->peer.rwnd;
4248 status.sstat_unackdata = asoc->unack_data;
4250 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4251 status.sstat_instrms = asoc->c.sinit_max_instreams;
4252 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4253 status.sstat_fragmentation_point = asoc->frag_point;
4254 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4255 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4256 transport->af_specific->sockaddr_len);
4257 /* Map ipv4 address into v4-mapped-on-v6 address. */
4258 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4259 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4260 status.sstat_primary.spinfo_state = transport->state;
4261 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4262 status.sstat_primary.spinfo_srtt = transport->srtt;
4263 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4264 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4266 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4267 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4269 if (put_user(len, optlen)) {
4274 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4275 __func__, len, status.sstat_state, status.sstat_rwnd,
4276 status.sstat_assoc_id);
4278 if (copy_to_user(optval, &status, len)) {
4288 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4290 * Applications can retrieve information about a specific peer address
4291 * of an association, including its reachability state, congestion
4292 * window, and retransmission timer values. This information is
4295 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4296 char __user *optval,
4299 struct sctp_paddrinfo pinfo;
4300 struct sctp_transport *transport;
4303 if (len < sizeof(pinfo)) {
4308 len = sizeof(pinfo);
4309 if (copy_from_user(&pinfo, optval, len)) {
4314 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4315 pinfo.spinfo_assoc_id);
4319 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4320 pinfo.spinfo_state = transport->state;
4321 pinfo.spinfo_cwnd = transport->cwnd;
4322 pinfo.spinfo_srtt = transport->srtt;
4323 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4324 pinfo.spinfo_mtu = transport->pathmtu;
4326 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4327 pinfo.spinfo_state = SCTP_ACTIVE;
4329 if (put_user(len, optlen)) {
4334 if (copy_to_user(optval, &pinfo, len)) {
4343 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4345 * This option is a on/off flag. If enabled no SCTP message
4346 * fragmentation will be performed. Instead if a message being sent
4347 * exceeds the current PMTU size, the message will NOT be sent and
4348 * instead a error will be indicated to the user.
4350 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4351 char __user *optval, int __user *optlen)
4355 if (len < sizeof(int))
4359 val = (sctp_sk(sk)->disable_fragments == 1);
4360 if (put_user(len, optlen))
4362 if (copy_to_user(optval, &val, len))
4367 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4369 * This socket option is used to specify various notifications and
4370 * ancillary data the user wishes to receive.
4372 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4377 if (len > sizeof(struct sctp_event_subscribe))
4378 len = sizeof(struct sctp_event_subscribe);
4379 if (put_user(len, optlen))
4381 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4386 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4388 * This socket option is applicable to the UDP-style socket only. When
4389 * set it will cause associations that are idle for more than the
4390 * specified number of seconds to automatically close. An association
4391 * being idle is defined an association that has NOT sent or received
4392 * user data. The special value of '0' indicates that no automatic
4393 * close of any associations should be performed. The option expects an
4394 * integer defining the number of seconds of idle time before an
4395 * association is closed.
4397 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4399 /* Applicable to UDP-style socket only */
4400 if (sctp_style(sk, TCP))
4402 if (len < sizeof(int))
4405 if (put_user(len, optlen))
4407 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4412 /* Helper routine to branch off an association to a new socket. */
4413 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4415 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4416 struct sctp_sock *sp = sctp_sk(sk);
4417 struct socket *sock;
4423 /* An association cannot be branched off from an already peeled-off
4424 * socket, nor is this supported for tcp style sockets.
4426 if (!sctp_style(sk, UDP))
4429 /* Create a new socket. */
4430 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4434 sctp_copy_sock(sock->sk, sk, asoc);
4436 /* Make peeled-off sockets more like 1-1 accepted sockets.
4437 * Set the daddr and initialize id to something more random
4439 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4441 /* Populate the fields of the newsk from the oldsk and migrate the
4442 * asoc to the newsk.
4444 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4450 EXPORT_SYMBOL(sctp_do_peeloff);
4452 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4454 sctp_peeloff_arg_t peeloff;
4455 struct socket *newsock;
4456 struct file *newfile;
4459 if (len < sizeof(sctp_peeloff_arg_t))
4461 len = sizeof(sctp_peeloff_arg_t);
4462 if (copy_from_user(&peeloff, optval, len))
4465 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4469 /* Map the socket to an unused fd that can be returned to the user. */
4470 retval = get_unused_fd_flags(0);
4472 sock_release(newsock);
4476 newfile = sock_alloc_file(newsock, 0, NULL);
4477 if (IS_ERR(newfile)) {
4478 put_unused_fd(retval);
4479 sock_release(newsock);
4480 return PTR_ERR(newfile);
4483 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4486 /* Return the fd mapped to the new socket. */
4487 if (put_user(len, optlen)) {
4489 put_unused_fd(retval);
4492 peeloff.sd = retval;
4493 if (copy_to_user(optval, &peeloff, len)) {
4495 put_unused_fd(retval);
4498 fd_install(retval, newfile);
4503 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4505 * Applications can enable or disable heartbeats for any peer address of
4506 * an association, modify an address's heartbeat interval, force a
4507 * heartbeat to be sent immediately, and adjust the address's maximum
4508 * number of retransmissions sent before an address is considered
4509 * unreachable. The following structure is used to access and modify an
4510 * address's parameters:
4512 * struct sctp_paddrparams {
4513 * sctp_assoc_t spp_assoc_id;
4514 * struct sockaddr_storage spp_address;
4515 * uint32_t spp_hbinterval;
4516 * uint16_t spp_pathmaxrxt;
4517 * uint32_t spp_pathmtu;
4518 * uint32_t spp_sackdelay;
4519 * uint32_t spp_flags;
4522 * spp_assoc_id - (one-to-many style socket) This is filled in the
4523 * application, and identifies the association for
4525 * spp_address - This specifies which address is of interest.
4526 * spp_hbinterval - This contains the value of the heartbeat interval,
4527 * in milliseconds. If a value of zero
4528 * is present in this field then no changes are to
4529 * be made to this parameter.
4530 * spp_pathmaxrxt - This contains the maximum number of
4531 * retransmissions before this address shall be
4532 * considered unreachable. If a value of zero
4533 * is present in this field then no changes are to
4534 * be made to this parameter.
4535 * spp_pathmtu - When Path MTU discovery is disabled the value
4536 * specified here will be the "fixed" path mtu.
4537 * Note that if the spp_address field is empty
4538 * then all associations on this address will
4539 * have this fixed path mtu set upon them.
4541 * spp_sackdelay - When delayed sack is enabled, this value specifies
4542 * the number of milliseconds that sacks will be delayed
4543 * for. This value will apply to all addresses of an
4544 * association if the spp_address field is empty. Note
4545 * also, that if delayed sack is enabled and this
4546 * value is set to 0, no change is made to the last
4547 * recorded delayed sack timer value.
4549 * spp_flags - These flags are used to control various features
4550 * on an association. The flag field may contain
4551 * zero or more of the following options.
4553 * SPP_HB_ENABLE - Enable heartbeats on the
4554 * specified address. Note that if the address
4555 * field is empty all addresses for the association
4556 * have heartbeats enabled upon them.
4558 * SPP_HB_DISABLE - Disable heartbeats on the
4559 * speicifed address. Note that if the address
4560 * field is empty all addresses for the association
4561 * will have their heartbeats disabled. Note also
4562 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4563 * mutually exclusive, only one of these two should
4564 * be specified. Enabling both fields will have
4565 * undetermined results.
4567 * SPP_HB_DEMAND - Request a user initiated heartbeat
4568 * to be made immediately.
4570 * SPP_PMTUD_ENABLE - This field will enable PMTU
4571 * discovery upon the specified address. Note that
4572 * if the address feild is empty then all addresses
4573 * on the association are effected.
4575 * SPP_PMTUD_DISABLE - This field will disable PMTU
4576 * discovery upon the specified address. Note that
4577 * if the address feild is empty then all addresses
4578 * on the association are effected. Not also that
4579 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4580 * exclusive. Enabling both will have undetermined
4583 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4584 * on delayed sack. The time specified in spp_sackdelay
4585 * is used to specify the sack delay for this address. Note
4586 * that if spp_address is empty then all addresses will
4587 * enable delayed sack and take on the sack delay
4588 * value specified in spp_sackdelay.
4589 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4590 * off delayed sack. If the spp_address field is blank then
4591 * delayed sack is disabled for the entire association. Note
4592 * also that this field is mutually exclusive to
4593 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4596 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4597 char __user *optval, int __user *optlen)
4599 struct sctp_paddrparams params;
4600 struct sctp_transport *trans = NULL;
4601 struct sctp_association *asoc = NULL;
4602 struct sctp_sock *sp = sctp_sk(sk);
4604 if (len < sizeof(struct sctp_paddrparams))
4606 len = sizeof(struct sctp_paddrparams);
4607 if (copy_from_user(¶ms, optval, len))
4610 /* If an address other than INADDR_ANY is specified, and
4611 * no transport is found, then the request is invalid.
4613 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4614 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4615 params.spp_assoc_id);
4617 pr_debug("%s: failed no transport\n", __func__);
4622 /* Get association, if assoc_id != 0 and the socket is a one
4623 * to many style socket, and an association was not found, then
4624 * the id was invalid.
4626 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4627 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4628 pr_debug("%s: failed no association\n", __func__);
4633 /* Fetch transport values. */
4634 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4635 params.spp_pathmtu = trans->pathmtu;
4636 params.spp_pathmaxrxt = trans->pathmaxrxt;
4637 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4639 /*draft-11 doesn't say what to return in spp_flags*/
4640 params.spp_flags = trans->param_flags;
4642 /* Fetch association values. */
4643 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4644 params.spp_pathmtu = asoc->pathmtu;
4645 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4646 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4648 /*draft-11 doesn't say what to return in spp_flags*/
4649 params.spp_flags = asoc->param_flags;
4651 /* Fetch socket values. */
4652 params.spp_hbinterval = sp->hbinterval;
4653 params.spp_pathmtu = sp->pathmtu;
4654 params.spp_sackdelay = sp->sackdelay;
4655 params.spp_pathmaxrxt = sp->pathmaxrxt;
4657 /*draft-11 doesn't say what to return in spp_flags*/
4658 params.spp_flags = sp->param_flags;
4661 if (copy_to_user(optval, ¶ms, len))
4664 if (put_user(len, optlen))
4671 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4673 * This option will effect the way delayed acks are performed. This
4674 * option allows you to get or set the delayed ack time, in
4675 * milliseconds. It also allows changing the delayed ack frequency.
4676 * Changing the frequency to 1 disables the delayed sack algorithm. If
4677 * the assoc_id is 0, then this sets or gets the endpoints default
4678 * values. If the assoc_id field is non-zero, then the set or get
4679 * effects the specified association for the one to many model (the
4680 * assoc_id field is ignored by the one to one model). Note that if
4681 * sack_delay or sack_freq are 0 when setting this option, then the
4682 * current values will remain unchanged.
4684 * struct sctp_sack_info {
4685 * sctp_assoc_t sack_assoc_id;
4686 * uint32_t sack_delay;
4687 * uint32_t sack_freq;
4690 * sack_assoc_id - This parameter, indicates which association the user
4691 * is performing an action upon. Note that if this field's value is
4692 * zero then the endpoints default value is changed (effecting future
4693 * associations only).
4695 * sack_delay - This parameter contains the number of milliseconds that
4696 * the user is requesting the delayed ACK timer be set to. Note that
4697 * this value is defined in the standard to be between 200 and 500
4700 * sack_freq - This parameter contains the number of packets that must
4701 * be received before a sack is sent without waiting for the delay
4702 * timer to expire. The default value for this is 2, setting this
4703 * value to 1 will disable the delayed sack algorithm.
4705 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4706 char __user *optval,
4709 struct sctp_sack_info params;
4710 struct sctp_association *asoc = NULL;
4711 struct sctp_sock *sp = sctp_sk(sk);
4713 if (len >= sizeof(struct sctp_sack_info)) {
4714 len = sizeof(struct sctp_sack_info);
4716 if (copy_from_user(¶ms, optval, len))
4718 } else if (len == sizeof(struct sctp_assoc_value)) {
4719 pr_warn_ratelimited(DEPRECATED
4721 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4722 "Use struct sctp_sack_info instead\n",
4723 current->comm, task_pid_nr(current));
4724 if (copy_from_user(¶ms, optval, len))
4729 /* Get association, if sack_assoc_id != 0 and the socket is a one
4730 * to many style socket, and an association was not found, then
4731 * the id was invalid.
4733 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4734 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4738 /* Fetch association values. */
4739 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4740 params.sack_delay = jiffies_to_msecs(
4742 params.sack_freq = asoc->sackfreq;
4745 params.sack_delay = 0;
4746 params.sack_freq = 1;
4749 /* Fetch socket values. */
4750 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4751 params.sack_delay = sp->sackdelay;
4752 params.sack_freq = sp->sackfreq;
4754 params.sack_delay = 0;
4755 params.sack_freq = 1;
4759 if (copy_to_user(optval, ¶ms, len))
4762 if (put_user(len, optlen))
4768 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4770 * Applications can specify protocol parameters for the default association
4771 * initialization. The option name argument to setsockopt() and getsockopt()
4774 * Setting initialization parameters is effective only on an unconnected
4775 * socket (for UDP-style sockets only future associations are effected
4776 * by the change). With TCP-style sockets, this option is inherited by
4777 * sockets derived from a listener socket.
4779 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4781 if (len < sizeof(struct sctp_initmsg))
4783 len = sizeof(struct sctp_initmsg);
4784 if (put_user(len, optlen))
4786 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4792 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4793 char __user *optval, int __user *optlen)
4795 struct sctp_association *asoc;
4797 struct sctp_getaddrs getaddrs;
4798 struct sctp_transport *from;
4800 union sctp_addr temp;
4801 struct sctp_sock *sp = sctp_sk(sk);
4806 if (len < sizeof(struct sctp_getaddrs))
4809 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4812 /* For UDP-style sockets, id specifies the association to query. */
4813 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4817 to = optval + offsetof(struct sctp_getaddrs, addrs);
4818 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4820 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4822 memcpy(&temp, &from->ipaddr, sizeof(temp));
4823 addrlen = sctp_get_pf_specific(sk->sk_family)
4824 ->addr_to_user(sp, &temp);
4825 if (space_left < addrlen)
4827 if (copy_to_user(to, &temp, addrlen))
4831 space_left -= addrlen;
4834 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4836 bytes_copied = ((char __user *)to) - optval;
4837 if (put_user(bytes_copied, optlen))
4843 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4844 size_t space_left, int *bytes_copied)
4846 struct sctp_sockaddr_entry *addr;
4847 union sctp_addr temp;
4850 struct net *net = sock_net(sk);
4853 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4857 if ((PF_INET == sk->sk_family) &&
4858 (AF_INET6 == addr->a.sa.sa_family))
4860 if ((PF_INET6 == sk->sk_family) &&
4861 inet_v6_ipv6only(sk) &&
4862 (AF_INET == addr->a.sa.sa_family))
4864 memcpy(&temp, &addr->a, sizeof(temp));
4865 if (!temp.v4.sin_port)
4866 temp.v4.sin_port = htons(port);
4868 addrlen = sctp_get_pf_specific(sk->sk_family)
4869 ->addr_to_user(sctp_sk(sk), &temp);
4871 if (space_left < addrlen) {
4875 memcpy(to, &temp, addrlen);
4879 space_left -= addrlen;
4880 *bytes_copied += addrlen;
4888 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4889 char __user *optval, int __user *optlen)
4891 struct sctp_bind_addr *bp;
4892 struct sctp_association *asoc;
4894 struct sctp_getaddrs getaddrs;
4895 struct sctp_sockaddr_entry *addr;
4897 union sctp_addr temp;
4898 struct sctp_sock *sp = sctp_sk(sk);
4902 int bytes_copied = 0;
4906 if (len < sizeof(struct sctp_getaddrs))
4909 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4913 * For UDP-style sockets, id specifies the association to query.
4914 * If the id field is set to the value '0' then the locally bound
4915 * addresses are returned without regard to any particular
4918 if (0 == getaddrs.assoc_id) {
4919 bp = &sctp_sk(sk)->ep->base.bind_addr;
4921 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4924 bp = &asoc->base.bind_addr;
4927 to = optval + offsetof(struct sctp_getaddrs, addrs);
4928 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4930 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
4934 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4935 * addresses from the global local address list.
4937 if (sctp_list_single_entry(&bp->address_list)) {
4938 addr = list_entry(bp->address_list.next,
4939 struct sctp_sockaddr_entry, list);
4940 if (sctp_is_any(sk, &addr->a)) {
4941 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4942 space_left, &bytes_copied);
4952 /* Protection on the bound address list is not needed since
4953 * in the socket option context we hold a socket lock and
4954 * thus the bound address list can't change.
4956 list_for_each_entry(addr, &bp->address_list, list) {
4957 memcpy(&temp, &addr->a, sizeof(temp));
4958 addrlen = sctp_get_pf_specific(sk->sk_family)
4959 ->addr_to_user(sp, &temp);
4960 if (space_left < addrlen) {
4961 err = -ENOMEM; /*fixme: right error?*/
4964 memcpy(buf, &temp, addrlen);
4966 bytes_copied += addrlen;
4968 space_left -= addrlen;
4972 if (copy_to_user(to, addrs, bytes_copied)) {
4976 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4980 if (put_user(bytes_copied, optlen))
4987 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4989 * Requests that the local SCTP stack use the enclosed peer address as
4990 * the association primary. The enclosed address must be one of the
4991 * association peer's addresses.
4993 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4994 char __user *optval, int __user *optlen)
4996 struct sctp_prim prim;
4997 struct sctp_association *asoc;
4998 struct sctp_sock *sp = sctp_sk(sk);
5000 if (len < sizeof(struct sctp_prim))
5003 len = sizeof(struct sctp_prim);
5005 if (copy_from_user(&prim, optval, len))
5008 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5012 if (!asoc->peer.primary_path)
5015 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5016 asoc->peer.primary_path->af_specific->sockaddr_len);
5018 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5019 (union sctp_addr *)&prim.ssp_addr);
5021 if (put_user(len, optlen))
5023 if (copy_to_user(optval, &prim, len))
5030 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5032 * Requests that the local endpoint set the specified Adaptation Layer
5033 * Indication parameter for all future INIT and INIT-ACK exchanges.
5035 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5036 char __user *optval, int __user *optlen)
5038 struct sctp_setadaptation adaptation;
5040 if (len < sizeof(struct sctp_setadaptation))
5043 len = sizeof(struct sctp_setadaptation);
5045 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5047 if (put_user(len, optlen))
5049 if (copy_to_user(optval, &adaptation, len))
5057 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5059 * Applications that wish to use the sendto() system call may wish to
5060 * specify a default set of parameters that would normally be supplied
5061 * through the inclusion of ancillary data. This socket option allows
5062 * such an application to set the default sctp_sndrcvinfo structure.
5065 * The application that wishes to use this socket option simply passes
5066 * in to this call the sctp_sndrcvinfo structure defined in Section
5067 * 5.2.2) The input parameters accepted by this call include
5068 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5069 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5070 * to this call if the caller is using the UDP model.
5072 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5074 static int sctp_getsockopt_default_send_param(struct sock *sk,
5075 int len, char __user *optval,
5078 struct sctp_sock *sp = sctp_sk(sk);
5079 struct sctp_association *asoc;
5080 struct sctp_sndrcvinfo info;
5082 if (len < sizeof(info))
5087 if (copy_from_user(&info, optval, len))
5090 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5091 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5094 info.sinfo_stream = asoc->default_stream;
5095 info.sinfo_flags = asoc->default_flags;
5096 info.sinfo_ppid = asoc->default_ppid;
5097 info.sinfo_context = asoc->default_context;
5098 info.sinfo_timetolive = asoc->default_timetolive;
5100 info.sinfo_stream = sp->default_stream;
5101 info.sinfo_flags = sp->default_flags;
5102 info.sinfo_ppid = sp->default_ppid;
5103 info.sinfo_context = sp->default_context;
5104 info.sinfo_timetolive = sp->default_timetolive;
5107 if (put_user(len, optlen))
5109 if (copy_to_user(optval, &info, len))
5115 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5116 * (SCTP_DEFAULT_SNDINFO)
5118 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5119 char __user *optval,
5122 struct sctp_sock *sp = sctp_sk(sk);
5123 struct sctp_association *asoc;
5124 struct sctp_sndinfo info;
5126 if (len < sizeof(info))
5131 if (copy_from_user(&info, optval, len))
5134 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5135 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5138 info.snd_sid = asoc->default_stream;
5139 info.snd_flags = asoc->default_flags;
5140 info.snd_ppid = asoc->default_ppid;
5141 info.snd_context = asoc->default_context;
5143 info.snd_sid = sp->default_stream;
5144 info.snd_flags = sp->default_flags;
5145 info.snd_ppid = sp->default_ppid;
5146 info.snd_context = sp->default_context;
5149 if (put_user(len, optlen))
5151 if (copy_to_user(optval, &info, len))
5159 * 7.1.5 SCTP_NODELAY
5161 * Turn on/off any Nagle-like algorithm. This means that packets are
5162 * generally sent as soon as possible and no unnecessary delays are
5163 * introduced, at the cost of more packets in the network. Expects an
5164 * integer boolean flag.
5167 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5168 char __user *optval, int __user *optlen)
5172 if (len < sizeof(int))
5176 val = (sctp_sk(sk)->nodelay == 1);
5177 if (put_user(len, optlen))
5179 if (copy_to_user(optval, &val, len))
5186 * 7.1.1 SCTP_RTOINFO
5188 * The protocol parameters used to initialize and bound retransmission
5189 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5190 * and modify these parameters.
5191 * All parameters are time values, in milliseconds. A value of 0, when
5192 * modifying the parameters, indicates that the current value should not
5196 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5197 char __user *optval,
5198 int __user *optlen) {
5199 struct sctp_rtoinfo rtoinfo;
5200 struct sctp_association *asoc;
5202 if (len < sizeof (struct sctp_rtoinfo))
5205 len = sizeof(struct sctp_rtoinfo);
5207 if (copy_from_user(&rtoinfo, optval, len))
5210 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5212 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5215 /* Values corresponding to the specific association. */
5217 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5218 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5219 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5221 /* Values corresponding to the endpoint. */
5222 struct sctp_sock *sp = sctp_sk(sk);
5224 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5225 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5226 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5229 if (put_user(len, optlen))
5232 if (copy_to_user(optval, &rtoinfo, len))
5240 * 7.1.2 SCTP_ASSOCINFO
5242 * This option is used to tune the maximum retransmission attempts
5243 * of the association.
5244 * Returns an error if the new association retransmission value is
5245 * greater than the sum of the retransmission value of the peer.
5246 * See [SCTP] for more information.
5249 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5250 char __user *optval,
5254 struct sctp_assocparams assocparams;
5255 struct sctp_association *asoc;
5256 struct list_head *pos;
5259 if (len < sizeof (struct sctp_assocparams))
5262 len = sizeof(struct sctp_assocparams);
5264 if (copy_from_user(&assocparams, optval, len))
5267 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5269 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5272 /* Values correspoinding to the specific association */
5274 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5275 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5276 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5277 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5279 list_for_each(pos, &asoc->peer.transport_addr_list) {
5283 assocparams.sasoc_number_peer_destinations = cnt;
5285 /* Values corresponding to the endpoint */
5286 struct sctp_sock *sp = sctp_sk(sk);
5288 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5289 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5290 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5291 assocparams.sasoc_cookie_life =
5292 sp->assocparams.sasoc_cookie_life;
5293 assocparams.sasoc_number_peer_destinations =
5295 sasoc_number_peer_destinations;
5298 if (put_user(len, optlen))
5301 if (copy_to_user(optval, &assocparams, len))
5308 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5310 * This socket option is a boolean flag which turns on or off mapped V4
5311 * addresses. If this option is turned on and the socket is type
5312 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5313 * If this option is turned off, then no mapping will be done of V4
5314 * addresses and a user will receive both PF_INET6 and PF_INET type
5315 * addresses on the socket.
5317 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5318 char __user *optval, int __user *optlen)
5321 struct sctp_sock *sp = sctp_sk(sk);
5323 if (len < sizeof(int))
5328 if (put_user(len, optlen))
5330 if (copy_to_user(optval, &val, len))
5337 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5338 * (chapter and verse is quoted at sctp_setsockopt_context())
5340 static int sctp_getsockopt_context(struct sock *sk, int len,
5341 char __user *optval, int __user *optlen)
5343 struct sctp_assoc_value params;
5344 struct sctp_sock *sp;
5345 struct sctp_association *asoc;
5347 if (len < sizeof(struct sctp_assoc_value))
5350 len = sizeof(struct sctp_assoc_value);
5352 if (copy_from_user(¶ms, optval, len))
5357 if (params.assoc_id != 0) {
5358 asoc = sctp_id2assoc(sk, params.assoc_id);
5361 params.assoc_value = asoc->default_rcv_context;
5363 params.assoc_value = sp->default_rcv_context;
5366 if (put_user(len, optlen))
5368 if (copy_to_user(optval, ¶ms, len))
5375 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5376 * This option will get or set the maximum size to put in any outgoing
5377 * SCTP DATA chunk. If a message is larger than this size it will be
5378 * fragmented by SCTP into the specified size. Note that the underlying
5379 * SCTP implementation may fragment into smaller sized chunks when the
5380 * PMTU of the underlying association is smaller than the value set by
5381 * the user. The default value for this option is '0' which indicates
5382 * the user is NOT limiting fragmentation and only the PMTU will effect
5383 * SCTP's choice of DATA chunk size. Note also that values set larger
5384 * than the maximum size of an IP datagram will effectively let SCTP
5385 * control fragmentation (i.e. the same as setting this option to 0).
5387 * The following structure is used to access and modify this parameter:
5389 * struct sctp_assoc_value {
5390 * sctp_assoc_t assoc_id;
5391 * uint32_t assoc_value;
5394 * assoc_id: This parameter is ignored for one-to-one style sockets.
5395 * For one-to-many style sockets this parameter indicates which
5396 * association the user is performing an action upon. Note that if
5397 * this field's value is zero then the endpoints default value is
5398 * changed (effecting future associations only).
5399 * assoc_value: This parameter specifies the maximum size in bytes.
5401 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5402 char __user *optval, int __user *optlen)
5404 struct sctp_assoc_value params;
5405 struct sctp_association *asoc;
5407 if (len == sizeof(int)) {
5408 pr_warn_ratelimited(DEPRECATED
5410 "Use of int in maxseg socket option.\n"
5411 "Use struct sctp_assoc_value instead\n",
5412 current->comm, task_pid_nr(current));
5413 params.assoc_id = 0;
5414 } else if (len >= sizeof(struct sctp_assoc_value)) {
5415 len = sizeof(struct sctp_assoc_value);
5416 if (copy_from_user(¶ms, optval, sizeof(params)))
5421 asoc = sctp_id2assoc(sk, params.assoc_id);
5422 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5426 params.assoc_value = asoc->frag_point;
5428 params.assoc_value = sctp_sk(sk)->user_frag;
5430 if (put_user(len, optlen))
5432 if (len == sizeof(int)) {
5433 if (copy_to_user(optval, ¶ms.assoc_value, len))
5436 if (copy_to_user(optval, ¶ms, len))
5444 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5445 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5447 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5448 char __user *optval, int __user *optlen)
5452 if (len < sizeof(int))
5457 val = sctp_sk(sk)->frag_interleave;
5458 if (put_user(len, optlen))
5460 if (copy_to_user(optval, &val, len))
5467 * 7.1.25. Set or Get the sctp partial delivery point
5468 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5470 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5471 char __user *optval,
5476 if (len < sizeof(u32))
5481 val = sctp_sk(sk)->pd_point;
5482 if (put_user(len, optlen))
5484 if (copy_to_user(optval, &val, len))
5491 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5492 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5494 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5495 char __user *optval,
5498 struct sctp_assoc_value params;
5499 struct sctp_sock *sp;
5500 struct sctp_association *asoc;
5502 if (len == sizeof(int)) {
5503 pr_warn_ratelimited(DEPRECATED
5505 "Use of int in max_burst socket option.\n"
5506 "Use struct sctp_assoc_value instead\n",
5507 current->comm, task_pid_nr(current));
5508 params.assoc_id = 0;
5509 } else if (len >= sizeof(struct sctp_assoc_value)) {
5510 len = sizeof(struct sctp_assoc_value);
5511 if (copy_from_user(¶ms, optval, len))
5518 if (params.assoc_id != 0) {
5519 asoc = sctp_id2assoc(sk, params.assoc_id);
5522 params.assoc_value = asoc->max_burst;
5524 params.assoc_value = sp->max_burst;
5526 if (len == sizeof(int)) {
5527 if (copy_to_user(optval, ¶ms.assoc_value, len))
5530 if (copy_to_user(optval, ¶ms, len))
5538 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5539 char __user *optval, int __user *optlen)
5541 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5542 struct sctp_hmacalgo __user *p = (void __user *)optval;
5543 struct sctp_hmac_algo_param *hmacs;
5547 if (!ep->auth_enable)
5550 hmacs = ep->auth_hmacs_list;
5551 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5553 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5556 len = sizeof(struct sctp_hmacalgo) + data_len;
5557 num_idents = data_len / sizeof(u16);
5559 if (put_user(len, optlen))
5561 if (put_user(num_idents, &p->shmac_num_idents))
5563 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5568 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5569 char __user *optval, int __user *optlen)
5571 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5572 struct sctp_authkeyid val;
5573 struct sctp_association *asoc;
5575 if (!ep->auth_enable)
5578 if (len < sizeof(struct sctp_authkeyid))
5580 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5583 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5584 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5588 val.scact_keynumber = asoc->active_key_id;
5590 val.scact_keynumber = ep->active_key_id;
5592 len = sizeof(struct sctp_authkeyid);
5593 if (put_user(len, optlen))
5595 if (copy_to_user(optval, &val, len))
5601 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5602 char __user *optval, int __user *optlen)
5604 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5605 struct sctp_authchunks __user *p = (void __user *)optval;
5606 struct sctp_authchunks val;
5607 struct sctp_association *asoc;
5608 struct sctp_chunks_param *ch;
5612 if (!ep->auth_enable)
5615 if (len < sizeof(struct sctp_authchunks))
5618 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5621 to = p->gauth_chunks;
5622 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5626 ch = asoc->peer.peer_chunks;
5630 /* See if the user provided enough room for all the data */
5631 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5632 if (len < num_chunks)
5635 if (copy_to_user(to, ch->chunks, num_chunks))
5638 len = sizeof(struct sctp_authchunks) + num_chunks;
5639 if (put_user(len, optlen))
5641 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5646 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5647 char __user *optval, int __user *optlen)
5649 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5650 struct sctp_authchunks __user *p = (void __user *)optval;
5651 struct sctp_authchunks val;
5652 struct sctp_association *asoc;
5653 struct sctp_chunks_param *ch;
5657 if (!ep->auth_enable)
5660 if (len < sizeof(struct sctp_authchunks))
5663 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5666 to = p->gauth_chunks;
5667 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5668 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5672 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5674 ch = ep->auth_chunk_list;
5679 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5680 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5683 if (copy_to_user(to, ch->chunks, num_chunks))
5686 len = sizeof(struct sctp_authchunks) + num_chunks;
5687 if (put_user(len, optlen))
5689 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5696 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5697 * This option gets the current number of associations that are attached
5698 * to a one-to-many style socket. The option value is an uint32_t.
5700 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5701 char __user *optval, int __user *optlen)
5703 struct sctp_sock *sp = sctp_sk(sk);
5704 struct sctp_association *asoc;
5707 if (sctp_style(sk, TCP))
5710 if (len < sizeof(u32))
5715 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5719 if (put_user(len, optlen))
5721 if (copy_to_user(optval, &val, len))
5728 * 8.1.23 SCTP_AUTO_ASCONF
5729 * See the corresponding setsockopt entry as description
5731 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5732 char __user *optval, int __user *optlen)
5736 if (len < sizeof(int))
5740 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5742 if (put_user(len, optlen))
5744 if (copy_to_user(optval, &val, len))
5750 * 8.2.6. Get the Current Identifiers of Associations
5751 * (SCTP_GET_ASSOC_ID_LIST)
5753 * This option gets the current list of SCTP association identifiers of
5754 * the SCTP associations handled by a one-to-many style socket.
5756 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5757 char __user *optval, int __user *optlen)
5759 struct sctp_sock *sp = sctp_sk(sk);
5760 struct sctp_association *asoc;
5761 struct sctp_assoc_ids *ids;
5764 if (sctp_style(sk, TCP))
5767 if (len < sizeof(struct sctp_assoc_ids))
5770 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5774 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5777 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5779 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
5783 ids->gaids_number_of_ids = num;
5785 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5786 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5789 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5799 * SCTP_PEER_ADDR_THLDS
5801 * This option allows us to fetch the partially failed threshold for one or all
5802 * transports in an association. See Section 6.1 of:
5803 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5805 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5806 char __user *optval,
5810 struct sctp_paddrthlds val;
5811 struct sctp_transport *trans;
5812 struct sctp_association *asoc;
5814 if (len < sizeof(struct sctp_paddrthlds))
5816 len = sizeof(struct sctp_paddrthlds);
5817 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5820 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5821 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5825 val.spt_pathpfthld = asoc->pf_retrans;
5826 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5828 trans = sctp_addr_id2transport(sk, &val.spt_address,
5833 val.spt_pathmaxrxt = trans->pathmaxrxt;
5834 val.spt_pathpfthld = trans->pf_retrans;
5837 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5844 * SCTP_GET_ASSOC_STATS
5846 * This option retrieves local per endpoint statistics. It is modeled
5847 * after OpenSolaris' implementation
5849 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5850 char __user *optval,
5853 struct sctp_assoc_stats sas;
5854 struct sctp_association *asoc = NULL;
5856 /* User must provide at least the assoc id */
5857 if (len < sizeof(sctp_assoc_t))
5860 /* Allow the struct to grow and fill in as much as possible */
5861 len = min_t(size_t, len, sizeof(sas));
5863 if (copy_from_user(&sas, optval, len))
5866 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5870 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5871 sas.sas_gapcnt = asoc->stats.gapcnt;
5872 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5873 sas.sas_osacks = asoc->stats.osacks;
5874 sas.sas_isacks = asoc->stats.isacks;
5875 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5876 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5877 sas.sas_oodchunks = asoc->stats.oodchunks;
5878 sas.sas_iodchunks = asoc->stats.iodchunks;
5879 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5880 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5881 sas.sas_idupchunks = asoc->stats.idupchunks;
5882 sas.sas_opackets = asoc->stats.opackets;
5883 sas.sas_ipackets = asoc->stats.ipackets;
5885 /* New high max rto observed, will return 0 if not a single
5886 * RTO update took place. obs_rto_ipaddr will be bogus
5889 sas.sas_maxrto = asoc->stats.max_obs_rto;
5890 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5891 sizeof(struct sockaddr_storage));
5893 /* Mark beginning of a new observation period */
5894 asoc->stats.max_obs_rto = asoc->rto_min;
5896 if (put_user(len, optlen))
5899 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5901 if (copy_to_user(optval, &sas, len))
5907 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5908 char __user *optval,
5913 if (len < sizeof(int))
5917 if (sctp_sk(sk)->recvrcvinfo)
5919 if (put_user(len, optlen))
5921 if (copy_to_user(optval, &val, len))
5927 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5928 char __user *optval,
5933 if (len < sizeof(int))
5937 if (sctp_sk(sk)->recvnxtinfo)
5939 if (put_user(len, optlen))
5941 if (copy_to_user(optval, &val, len))
5947 static int sctp_getsockopt(struct sock *sk, int level, int optname,
5948 char __user *optval, int __user *optlen)
5953 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
5955 /* I can hardly begin to describe how wrong this is. This is
5956 * so broken as to be worse than useless. The API draft
5957 * REALLY is NOT helpful here... I am not convinced that the
5958 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5959 * are at all well-founded.
5961 if (level != SOL_SCTP) {
5962 struct sctp_af *af = sctp_sk(sk)->pf->af;
5964 retval = af->getsockopt(sk, level, optname, optval, optlen);
5968 if (get_user(len, optlen))
5975 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5977 case SCTP_DISABLE_FRAGMENTS:
5978 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5982 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5984 case SCTP_AUTOCLOSE:
5985 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5987 case SCTP_SOCKOPT_PEELOFF:
5988 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5990 case SCTP_PEER_ADDR_PARAMS:
5991 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5994 case SCTP_DELAYED_SACK:
5995 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5999 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6001 case SCTP_GET_PEER_ADDRS:
6002 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6005 case SCTP_GET_LOCAL_ADDRS:
6006 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6009 case SCTP_SOCKOPT_CONNECTX3:
6010 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6012 case SCTP_DEFAULT_SEND_PARAM:
6013 retval = sctp_getsockopt_default_send_param(sk, len,
6016 case SCTP_DEFAULT_SNDINFO:
6017 retval = sctp_getsockopt_default_sndinfo(sk, len,
6020 case SCTP_PRIMARY_ADDR:
6021 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6024 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6027 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6029 case SCTP_ASSOCINFO:
6030 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6032 case SCTP_I_WANT_MAPPED_V4_ADDR:
6033 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6036 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6038 case SCTP_GET_PEER_ADDR_INFO:
6039 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6042 case SCTP_ADAPTATION_LAYER:
6043 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6047 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6049 case SCTP_FRAGMENT_INTERLEAVE:
6050 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6053 case SCTP_PARTIAL_DELIVERY_POINT:
6054 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6057 case SCTP_MAX_BURST:
6058 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6061 case SCTP_AUTH_CHUNK:
6062 case SCTP_AUTH_DELETE_KEY:
6063 retval = -EOPNOTSUPP;
6065 case SCTP_HMAC_IDENT:
6066 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6068 case SCTP_AUTH_ACTIVE_KEY:
6069 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6071 case SCTP_PEER_AUTH_CHUNKS:
6072 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6075 case SCTP_LOCAL_AUTH_CHUNKS:
6076 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6079 case SCTP_GET_ASSOC_NUMBER:
6080 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6082 case SCTP_GET_ASSOC_ID_LIST:
6083 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6085 case SCTP_AUTO_ASCONF:
6086 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6088 case SCTP_PEER_ADDR_THLDS:
6089 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6091 case SCTP_GET_ASSOC_STATS:
6092 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6094 case SCTP_RECVRCVINFO:
6095 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6097 case SCTP_RECVNXTINFO:
6098 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6101 retval = -ENOPROTOOPT;
6109 static void sctp_hash(struct sock *sk)
6114 static void sctp_unhash(struct sock *sk)
6119 /* Check if port is acceptable. Possibly find first available port.
6121 * The port hash table (contained in the 'global' SCTP protocol storage
6122 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6123 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6124 * list (the list number is the port number hashed out, so as you
6125 * would expect from a hash function, all the ports in a given list have
6126 * such a number that hashes out to the same list number; you were
6127 * expecting that, right?); so each list has a set of ports, with a
6128 * link to the socket (struct sock) that uses it, the port number and
6129 * a fastreuse flag (FIXME: NPI ipg).
6131 static struct sctp_bind_bucket *sctp_bucket_create(
6132 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6134 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6136 struct sctp_bind_hashbucket *head; /* hash list */
6137 struct sctp_bind_bucket *pp;
6138 unsigned short snum;
6141 snum = ntohs(addr->v4.sin_port);
6143 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6148 /* Search for an available port. */
6149 int low, high, remaining, index;
6151 struct net *net = sock_net(sk);
6153 inet_get_local_port_range(net, &low, &high);
6154 remaining = (high - low) + 1;
6155 rover = prandom_u32() % remaining + low;
6159 if ((rover < low) || (rover > high))
6161 if (inet_is_local_reserved_port(net, rover))
6163 index = sctp_phashfn(sock_net(sk), rover);
6164 head = &sctp_port_hashtable[index];
6165 spin_lock(&head->lock);
6166 sctp_for_each_hentry(pp, &head->chain)
6167 if ((pp->port == rover) &&
6168 net_eq(sock_net(sk), pp->net))
6172 spin_unlock(&head->lock);
6173 } while (--remaining > 0);
6175 /* Exhausted local port range during search? */
6180 /* OK, here is the one we will use. HEAD (the port
6181 * hash table list entry) is non-NULL and we hold it's
6186 /* We are given an specific port number; we verify
6187 * that it is not being used. If it is used, we will
6188 * exahust the search in the hash list corresponding
6189 * to the port number (snum) - we detect that with the
6190 * port iterator, pp being NULL.
6192 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6193 spin_lock(&head->lock);
6194 sctp_for_each_hentry(pp, &head->chain) {
6195 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6202 if (!hlist_empty(&pp->owner)) {
6203 /* We had a port hash table hit - there is an
6204 * available port (pp != NULL) and it is being
6205 * used by other socket (pp->owner not empty); that other
6206 * socket is going to be sk2.
6208 int reuse = sk->sk_reuse;
6211 pr_debug("%s: found a possible match\n", __func__);
6213 if (pp->fastreuse && sk->sk_reuse &&
6214 sk->sk_state != SCTP_SS_LISTENING)
6217 /* Run through the list of sockets bound to the port
6218 * (pp->port) [via the pointers bind_next and
6219 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6220 * we get the endpoint they describe and run through
6221 * the endpoint's list of IP (v4 or v6) addresses,
6222 * comparing each of the addresses with the address of
6223 * the socket sk. If we find a match, then that means
6224 * that this port/socket (sk) combination are already
6227 sk_for_each_bound(sk2, &pp->owner) {
6228 struct sctp_endpoint *ep2;
6229 ep2 = sctp_sk(sk2)->ep;
6232 (reuse && sk2->sk_reuse &&
6233 sk2->sk_state != SCTP_SS_LISTENING))
6236 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6237 sctp_sk(sk2), sctp_sk(sk))) {
6243 pr_debug("%s: found a match\n", __func__);
6246 /* If there was a hash table miss, create a new port. */
6248 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6251 /* In either case (hit or miss), make sure fastreuse is 1 only
6252 * if sk->sk_reuse is too (that is, if the caller requested
6253 * SO_REUSEADDR on this socket -sk-).
6255 if (hlist_empty(&pp->owner)) {
6256 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6260 } else if (pp->fastreuse &&
6261 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6264 /* We are set, so fill up all the data in the hash table
6265 * entry, tie the socket list information with the rest of the
6266 * sockets FIXME: Blurry, NPI (ipg).
6269 if (!sctp_sk(sk)->bind_hash) {
6270 inet_sk(sk)->inet_num = snum;
6271 sk_add_bind_node(sk, &pp->owner);
6272 sctp_sk(sk)->bind_hash = pp;
6277 spin_unlock(&head->lock);
6284 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6285 * port is requested.
6287 static int sctp_get_port(struct sock *sk, unsigned short snum)
6289 union sctp_addr addr;
6290 struct sctp_af *af = sctp_sk(sk)->pf->af;
6292 /* Set up a dummy address struct from the sk. */
6293 af->from_sk(&addr, sk);
6294 addr.v4.sin_port = htons(snum);
6296 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6297 return !!sctp_get_port_local(sk, &addr);
6301 * Move a socket to LISTENING state.
6303 static int sctp_listen_start(struct sock *sk, int backlog)
6305 struct sctp_sock *sp = sctp_sk(sk);
6306 struct sctp_endpoint *ep = sp->ep;
6307 struct crypto_hash *tfm = NULL;
6310 /* Allocate HMAC for generating cookie. */
6311 if (!sp->hmac && sp->sctp_hmac_alg) {
6312 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6313 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6315 net_info_ratelimited("failed to load transform for %s: %ld\n",
6316 sp->sctp_hmac_alg, PTR_ERR(tfm));
6319 sctp_sk(sk)->hmac = tfm;
6323 * If a bind() or sctp_bindx() is not called prior to a listen()
6324 * call that allows new associations to be accepted, the system
6325 * picks an ephemeral port and will choose an address set equivalent
6326 * to binding with a wildcard address.
6328 * This is not currently spelled out in the SCTP sockets
6329 * extensions draft, but follows the practice as seen in TCP
6333 sk->sk_state = SCTP_SS_LISTENING;
6334 if (!ep->base.bind_addr.port) {
6335 if (sctp_autobind(sk))
6338 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6339 sk->sk_state = SCTP_SS_CLOSED;
6344 sk->sk_max_ack_backlog = backlog;
6345 sctp_hash_endpoint(ep);
6350 * 4.1.3 / 5.1.3 listen()
6352 * By default, new associations are not accepted for UDP style sockets.
6353 * An application uses listen() to mark a socket as being able to
6354 * accept new associations.
6356 * On TCP style sockets, applications use listen() to ready the SCTP
6357 * endpoint for accepting inbound associations.
6359 * On both types of endpoints a backlog of '0' disables listening.
6361 * Move a socket to LISTENING state.
6363 int sctp_inet_listen(struct socket *sock, int backlog)
6365 struct sock *sk = sock->sk;
6366 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6369 if (unlikely(backlog < 0))
6374 /* Peeled-off sockets are not allowed to listen(). */
6375 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6378 if (sock->state != SS_UNCONNECTED)
6381 /* If backlog is zero, disable listening. */
6383 if (sctp_sstate(sk, CLOSED))
6387 sctp_unhash_endpoint(ep);
6388 sk->sk_state = SCTP_SS_CLOSED;
6390 sctp_sk(sk)->bind_hash->fastreuse = 1;
6394 /* If we are already listening, just update the backlog */
6395 if (sctp_sstate(sk, LISTENING))
6396 sk->sk_max_ack_backlog = backlog;
6398 err = sctp_listen_start(sk, backlog);
6410 * This function is done by modeling the current datagram_poll() and the
6411 * tcp_poll(). Note that, based on these implementations, we don't
6412 * lock the socket in this function, even though it seems that,
6413 * ideally, locking or some other mechanisms can be used to ensure
6414 * the integrity of the counters (sndbuf and wmem_alloc) used
6415 * in this place. We assume that we don't need locks either until proven
6418 * Another thing to note is that we include the Async I/O support
6419 * here, again, by modeling the current TCP/UDP code. We don't have
6420 * a good way to test with it yet.
6422 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6424 struct sock *sk = sock->sk;
6425 struct sctp_sock *sp = sctp_sk(sk);
6428 poll_wait(file, sk_sleep(sk), wait);
6430 /* A TCP-style listening socket becomes readable when the accept queue
6433 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6434 return (!list_empty(&sp->ep->asocs)) ?
6435 (POLLIN | POLLRDNORM) : 0;
6439 /* Is there any exceptional events? */
6440 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6442 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6443 if (sk->sk_shutdown & RCV_SHUTDOWN)
6444 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6445 if (sk->sk_shutdown == SHUTDOWN_MASK)
6448 /* Is it readable? Reconsider this code with TCP-style support. */
6449 if (!skb_queue_empty(&sk->sk_receive_queue))
6450 mask |= POLLIN | POLLRDNORM;
6452 /* The association is either gone or not ready. */
6453 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6456 /* Is it writable? */
6457 if (sctp_writeable(sk)) {
6458 mask |= POLLOUT | POLLWRNORM;
6460 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
6462 * Since the socket is not locked, the buffer
6463 * might be made available after the writeable check and
6464 * before the bit is set. This could cause a lost I/O
6465 * signal. tcp_poll() has a race breaker for this race
6466 * condition. Based on their implementation, we put
6467 * in the following code to cover it as well.
6469 if (sctp_writeable(sk))
6470 mask |= POLLOUT | POLLWRNORM;
6475 /********************************************************************
6476 * 2nd Level Abstractions
6477 ********************************************************************/
6479 static struct sctp_bind_bucket *sctp_bucket_create(
6480 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6482 struct sctp_bind_bucket *pp;
6484 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6486 SCTP_DBG_OBJCNT_INC(bind_bucket);
6489 INIT_HLIST_HEAD(&pp->owner);
6491 hlist_add_head(&pp->node, &head->chain);
6496 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6497 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6499 if (pp && hlist_empty(&pp->owner)) {
6500 __hlist_del(&pp->node);
6501 kmem_cache_free(sctp_bucket_cachep, pp);
6502 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6506 /* Release this socket's reference to a local port. */
6507 static inline void __sctp_put_port(struct sock *sk)
6509 struct sctp_bind_hashbucket *head =
6510 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6511 inet_sk(sk)->inet_num)];
6512 struct sctp_bind_bucket *pp;
6514 spin_lock(&head->lock);
6515 pp = sctp_sk(sk)->bind_hash;
6516 __sk_del_bind_node(sk);
6517 sctp_sk(sk)->bind_hash = NULL;
6518 inet_sk(sk)->inet_num = 0;
6519 sctp_bucket_destroy(pp);
6520 spin_unlock(&head->lock);
6523 void sctp_put_port(struct sock *sk)
6526 __sctp_put_port(sk);
6531 * The system picks an ephemeral port and choose an address set equivalent
6532 * to binding with a wildcard address.
6533 * One of those addresses will be the primary address for the association.
6534 * This automatically enables the multihoming capability of SCTP.
6536 static int sctp_autobind(struct sock *sk)
6538 union sctp_addr autoaddr;
6542 /* Initialize a local sockaddr structure to INADDR_ANY. */
6543 af = sctp_sk(sk)->pf->af;
6545 port = htons(inet_sk(sk)->inet_num);
6546 af->inaddr_any(&autoaddr, port);
6548 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6551 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6554 * 4.2 The cmsghdr Structure *
6556 * When ancillary data is sent or received, any number of ancillary data
6557 * objects can be specified by the msg_control and msg_controllen members of
6558 * the msghdr structure, because each object is preceded by
6559 * a cmsghdr structure defining the object's length (the cmsg_len member).
6560 * Historically Berkeley-derived implementations have passed only one object
6561 * at a time, but this API allows multiple objects to be
6562 * passed in a single call to sendmsg() or recvmsg(). The following example
6563 * shows two ancillary data objects in a control buffer.
6565 * |<--------------------------- msg_controllen -------------------------->|
6568 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6570 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6573 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6575 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6578 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6579 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6581 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6583 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6590 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6592 struct cmsghdr *cmsg;
6593 struct msghdr *my_msg = (struct msghdr *)msg;
6595 for_each_cmsghdr(cmsg, my_msg) {
6596 if (!CMSG_OK(my_msg, cmsg))
6599 /* Should we parse this header or ignore? */
6600 if (cmsg->cmsg_level != IPPROTO_SCTP)
6603 /* Strictly check lengths following example in SCM code. */
6604 switch (cmsg->cmsg_type) {
6606 /* SCTP Socket API Extension
6607 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6609 * This cmsghdr structure provides information for
6610 * initializing new SCTP associations with sendmsg().
6611 * The SCTP_INITMSG socket option uses this same data
6612 * structure. This structure is not used for
6615 * cmsg_level cmsg_type cmsg_data[]
6616 * ------------ ------------ ----------------------
6617 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6619 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6622 cmsgs->init = CMSG_DATA(cmsg);
6626 /* SCTP Socket API Extension
6627 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6629 * This cmsghdr structure specifies SCTP options for
6630 * sendmsg() and describes SCTP header information
6631 * about a received message through recvmsg().
6633 * cmsg_level cmsg_type cmsg_data[]
6634 * ------------ ------------ ----------------------
6635 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6637 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6640 cmsgs->srinfo = CMSG_DATA(cmsg);
6642 if (cmsgs->srinfo->sinfo_flags &
6643 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6644 SCTP_ABORT | SCTP_EOF))
6649 /* SCTP Socket API Extension
6650 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6652 * This cmsghdr structure specifies SCTP options for
6653 * sendmsg(). This structure and SCTP_RCVINFO replaces
6654 * SCTP_SNDRCV which has been deprecated.
6656 * cmsg_level cmsg_type cmsg_data[]
6657 * ------------ ------------ ---------------------
6658 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6660 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6663 cmsgs->sinfo = CMSG_DATA(cmsg);
6665 if (cmsgs->sinfo->snd_flags &
6666 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6667 SCTP_ABORT | SCTP_EOF))
6679 * Wait for a packet..
6680 * Note: This function is the same function as in core/datagram.c
6681 * with a few modifications to make lksctp work.
6683 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6688 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6690 /* Socket errors? */
6691 error = sock_error(sk);
6695 if (!skb_queue_empty(&sk->sk_receive_queue))
6698 /* Socket shut down? */
6699 if (sk->sk_shutdown & RCV_SHUTDOWN)
6702 /* Sequenced packets can come disconnected. If so we report the
6707 /* Is there a good reason to think that we may receive some data? */
6708 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6711 /* Handle signals. */
6712 if (signal_pending(current))
6715 /* Let another process have a go. Since we are going to sleep
6716 * anyway. Note: This may cause odd behaviors if the message
6717 * does not fit in the user's buffer, but this seems to be the
6718 * only way to honor MSG_DONTWAIT realistically.
6721 *timeo_p = schedule_timeout(*timeo_p);
6725 finish_wait(sk_sleep(sk), &wait);
6729 error = sock_intr_errno(*timeo_p);
6732 finish_wait(sk_sleep(sk), &wait);
6737 /* Receive a datagram.
6738 * Note: This is pretty much the same routine as in core/datagram.c
6739 * with a few changes to make lksctp work.
6741 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6742 int noblock, int *err)
6745 struct sk_buff *skb;
6748 timeo = sock_rcvtimeo(sk, noblock);
6750 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6751 MAX_SCHEDULE_TIMEOUT);
6754 /* Again only user level code calls this function,
6755 * so nothing interrupt level
6756 * will suddenly eat the receive_queue.
6758 * Look at current nfs client by the way...
6759 * However, this function was correct in any case. 8)
6761 if (flags & MSG_PEEK) {
6762 spin_lock_bh(&sk->sk_receive_queue.lock);
6763 skb = skb_peek(&sk->sk_receive_queue);
6765 atomic_inc(&skb->users);
6766 spin_unlock_bh(&sk->sk_receive_queue.lock);
6768 skb = skb_dequeue(&sk->sk_receive_queue);
6774 /* Caller is allowed not to check sk->sk_err before calling. */
6775 error = sock_error(sk);
6779 if (sk->sk_shutdown & RCV_SHUTDOWN)
6782 if (sk_can_busy_loop(sk) &&
6783 sk_busy_loop(sk, noblock))
6786 /* User doesn't want to wait. */
6790 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6799 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6800 static void __sctp_write_space(struct sctp_association *asoc)
6802 struct sock *sk = asoc->base.sk;
6804 if (sctp_wspace(asoc) <= 0)
6807 if (waitqueue_active(&asoc->wait))
6808 wake_up_interruptible(&asoc->wait);
6810 if (sctp_writeable(sk)) {
6811 struct socket_wq *wq;
6814 wq = rcu_dereference(sk->sk_wq);
6816 if (waitqueue_active(&wq->wait))
6817 wake_up_interruptible(&wq->wait);
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(wq, 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_tsflags = sk->sk_tsflags;
7170 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7171 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7172 newsk->sk_reuse = sk->sk_reuse;
7174 newsk->sk_shutdown = sk->sk_shutdown;
7175 newsk->sk_destruct = sctp_destruct_sock;
7176 newsk->sk_family = sk->sk_family;
7177 newsk->sk_protocol = IPPROTO_SCTP;
7178 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7179 newsk->sk_sndbuf = sk->sk_sndbuf;
7180 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7181 newsk->sk_lingertime = sk->sk_lingertime;
7182 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7183 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7185 newinet = inet_sk(newsk);
7187 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7188 * getsockname() and getpeername()
7190 newinet->inet_sport = inet->inet_sport;
7191 newinet->inet_saddr = inet->inet_saddr;
7192 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7193 newinet->inet_dport = htons(asoc->peer.port);
7194 newinet->pmtudisc = inet->pmtudisc;
7195 newinet->inet_id = asoc->next_tsn ^ jiffies;
7197 newinet->uc_ttl = inet->uc_ttl;
7198 newinet->mc_loop = 1;
7199 newinet->mc_ttl = 1;
7200 newinet->mc_index = 0;
7201 newinet->mc_list = NULL;
7203 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
7204 net_enable_timestamp();
7206 security_sk_clone(sk, newsk);
7209 static inline void sctp_copy_descendant(struct sock *sk_to,
7210 const struct sock *sk_from)
7212 int ancestor_size = sizeof(struct inet_sock) +
7213 sizeof(struct sctp_sock) -
7214 offsetof(struct sctp_sock, auto_asconf_list);
7216 if (sk_from->sk_family == PF_INET6)
7217 ancestor_size += sizeof(struct ipv6_pinfo);
7219 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7222 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7223 * and its messages to the newsk.
7225 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7226 struct sctp_association *assoc,
7227 sctp_socket_type_t type)
7229 struct sctp_sock *oldsp = sctp_sk(oldsk);
7230 struct sctp_sock *newsp = sctp_sk(newsk);
7231 struct sctp_bind_bucket *pp; /* hash list port iterator */
7232 struct sctp_endpoint *newep = newsp->ep;
7233 struct sk_buff *skb, *tmp;
7234 struct sctp_ulpevent *event;
7235 struct sctp_bind_hashbucket *head;
7237 /* Migrate socket buffer sizes and all the socket level options to the
7240 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7241 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7242 /* Brute force copy old sctp opt. */
7243 sctp_copy_descendant(newsk, oldsk);
7245 /* Restore the ep value that was overwritten with the above structure
7251 /* Hook this new socket in to the bind_hash list. */
7252 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7253 inet_sk(oldsk)->inet_num)];
7255 spin_lock(&head->lock);
7256 pp = sctp_sk(oldsk)->bind_hash;
7257 sk_add_bind_node(newsk, &pp->owner);
7258 sctp_sk(newsk)->bind_hash = pp;
7259 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7260 spin_unlock(&head->lock);
7263 /* Copy the bind_addr list from the original endpoint to the new
7264 * endpoint so that we can handle restarts properly
7266 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7267 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7269 /* Move any messages in the old socket's receive queue that are for the
7270 * peeled off association to the new socket's receive queue.
7272 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7273 event = sctp_skb2event(skb);
7274 if (event->asoc == assoc) {
7275 __skb_unlink(skb, &oldsk->sk_receive_queue);
7276 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7277 sctp_skb_set_owner_r_frag(skb, newsk);
7281 /* Clean up any messages pending delivery due to partial
7282 * delivery. Three cases:
7283 * 1) No partial deliver; no work.
7284 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7285 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7287 skb_queue_head_init(&newsp->pd_lobby);
7288 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7290 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7291 struct sk_buff_head *queue;
7293 /* Decide which queue to move pd_lobby skbs to. */
7294 if (assoc->ulpq.pd_mode) {
7295 queue = &newsp->pd_lobby;
7297 queue = &newsk->sk_receive_queue;
7299 /* Walk through the pd_lobby, looking for skbs that
7300 * need moved to the new socket.
7302 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7303 event = sctp_skb2event(skb);
7304 if (event->asoc == assoc) {
7305 __skb_unlink(skb, &oldsp->pd_lobby);
7306 __skb_queue_tail(queue, skb);
7307 sctp_skb_set_owner_r_frag(skb, newsk);
7311 /* Clear up any skbs waiting for the partial
7312 * delivery to finish.
7314 if (assoc->ulpq.pd_mode)
7315 sctp_clear_pd(oldsk, NULL);
7319 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7320 sctp_skb_set_owner_r_frag(skb, newsk);
7322 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7323 sctp_skb_set_owner_r_frag(skb, newsk);
7325 /* Set the type of socket to indicate that it is peeled off from the
7326 * original UDP-style socket or created with the accept() call on a
7327 * TCP-style socket..
7331 /* Mark the new socket "in-use" by the user so that any packets
7332 * that may arrive on the association after we've moved it are
7333 * queued to the backlog. This prevents a potential race between
7334 * backlog processing on the old socket and new-packet processing
7335 * on the new socket.
7337 * The caller has just allocated newsk so we can guarantee that other
7338 * paths won't try to lock it and then oldsk.
7340 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7341 sctp_assoc_migrate(assoc, newsk);
7343 /* If the association on the newsk is already closed before accept()
7344 * is called, set RCV_SHUTDOWN flag.
7346 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7347 newsk->sk_shutdown |= RCV_SHUTDOWN;
7349 newsk->sk_state = SCTP_SS_ESTABLISHED;
7350 release_sock(newsk);
7354 /* This proto struct describes the ULP interface for SCTP. */
7355 struct proto sctp_prot = {
7357 .owner = THIS_MODULE,
7358 .close = sctp_close,
7359 .connect = sctp_connect,
7360 .disconnect = sctp_disconnect,
7361 .accept = sctp_accept,
7362 .ioctl = sctp_ioctl,
7363 .init = sctp_init_sock,
7364 .destroy = sctp_destroy_sock,
7365 .shutdown = sctp_shutdown,
7366 .setsockopt = sctp_setsockopt,
7367 .getsockopt = sctp_getsockopt,
7368 .sendmsg = sctp_sendmsg,
7369 .recvmsg = sctp_recvmsg,
7371 .backlog_rcv = sctp_backlog_rcv,
7373 .unhash = sctp_unhash,
7374 .get_port = sctp_get_port,
7375 .obj_size = sizeof(struct sctp_sock),
7376 .sysctl_mem = sysctl_sctp_mem,
7377 .sysctl_rmem = sysctl_sctp_rmem,
7378 .sysctl_wmem = sysctl_sctp_wmem,
7379 .memory_pressure = &sctp_memory_pressure,
7380 .enter_memory_pressure = sctp_enter_memory_pressure,
7381 .memory_allocated = &sctp_memory_allocated,
7382 .sockets_allocated = &sctp_sockets_allocated,
7385 #if IS_ENABLED(CONFIG_IPV6)
7387 #include <net/transp_v6.h>
7388 static void sctp_v6_destroy_sock(struct sock *sk)
7390 sctp_destroy_sock(sk);
7391 inet6_destroy_sock(sk);
7394 struct proto sctpv6_prot = {
7396 .owner = THIS_MODULE,
7397 .close = sctp_close,
7398 .connect = sctp_connect,
7399 .disconnect = sctp_disconnect,
7400 .accept = sctp_accept,
7401 .ioctl = sctp_ioctl,
7402 .init = sctp_init_sock,
7403 .destroy = sctp_v6_destroy_sock,
7404 .shutdown = sctp_shutdown,
7405 .setsockopt = sctp_setsockopt,
7406 .getsockopt = sctp_getsockopt,
7407 .sendmsg = sctp_sendmsg,
7408 .recvmsg = sctp_recvmsg,
7410 .backlog_rcv = sctp_backlog_rcv,
7412 .unhash = sctp_unhash,
7413 .get_port = sctp_get_port,
7414 .obj_size = sizeof(struct sctp6_sock),
7415 .sysctl_mem = sysctl_sctp_mem,
7416 .sysctl_rmem = sysctl_sctp_rmem,
7417 .sysctl_wmem = sysctl_sctp_wmem,
7418 .memory_pressure = &sctp_memory_pressure,
7419 .enter_memory_pressure = sctp_enter_memory_pressure,
7420 .memory_allocated = &sctp_memory_allocated,
7421 .sockets_allocated = &sctp_sockets_allocated,
7423 #endif /* IS_ENABLED(CONFIG_IPV6) */