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_KERNEL);
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)
1305 struct sockaddr *kaddrs;
1307 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1308 __func__, sk, addrs, addrs_size);
1310 if (unlikely(addrs_size <= 0))
1313 /* Check the user passed a healthy pointer. */
1314 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1317 /* Alloc space for the address array in kernel memory. */
1318 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1319 if (unlikely(!kaddrs))
1322 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1325 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1334 * This is an older interface. It's kept for backward compatibility
1335 * to the option that doesn't provide association id.
1337 static int sctp_setsockopt_connectx_old(struct sock *sk,
1338 struct sockaddr __user *addrs,
1341 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1345 * New interface for the API. The since the API is done with a socket
1346 * option, to make it simple we feed back the association id is as a return
1347 * indication to the call. Error is always negative and association id is
1350 static int sctp_setsockopt_connectx(struct sock *sk,
1351 struct sockaddr __user *addrs,
1354 sctp_assoc_t assoc_id = 0;
1357 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1366 * New (hopefully final) interface for the API.
1367 * We use the sctp_getaddrs_old structure so that use-space library
1368 * can avoid any unnecessary allocations. The only different part
1369 * is that we store the actual length of the address buffer into the
1370 * addrs_num structure member. That way we can re-use the existing
1373 #ifdef CONFIG_COMPAT
1374 struct compat_sctp_getaddrs_old {
1375 sctp_assoc_t assoc_id;
1377 compat_uptr_t addrs; /* struct sockaddr * */
1381 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1382 char __user *optval,
1385 struct sctp_getaddrs_old param;
1386 sctp_assoc_t assoc_id = 0;
1389 #ifdef CONFIG_COMPAT
1390 if (is_compat_task()) {
1391 struct compat_sctp_getaddrs_old param32;
1393 if (len < sizeof(param32))
1395 if (copy_from_user(¶m32, optval, sizeof(param32)))
1398 param.assoc_id = param32.assoc_id;
1399 param.addr_num = param32.addr_num;
1400 param.addrs = compat_ptr(param32.addrs);
1404 if (len < sizeof(param))
1406 if (copy_from_user(¶m, optval, sizeof(param)))
1410 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1411 param.addrs, param.addr_num,
1413 if (err == 0 || err == -EINPROGRESS) {
1414 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1416 if (put_user(sizeof(assoc_id), optlen))
1423 /* API 3.1.4 close() - UDP Style Syntax
1424 * Applications use close() to perform graceful shutdown (as described in
1425 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1426 * by a UDP-style socket.
1430 * ret = close(int sd);
1432 * sd - the socket descriptor of the associations to be closed.
1434 * To gracefully shutdown a specific association represented by the
1435 * UDP-style socket, an application should use the sendmsg() call,
1436 * passing no user data, but including the appropriate flag in the
1437 * ancillary data (see Section xxxx).
1439 * If sd in the close() call is a branched-off socket representing only
1440 * one association, the shutdown is performed on that association only.
1442 * 4.1.6 close() - TCP Style Syntax
1444 * Applications use close() to gracefully close down an association.
1448 * int close(int sd);
1450 * sd - the socket descriptor of the association to be closed.
1452 * After an application calls close() on a socket descriptor, no further
1453 * socket operations will succeed on that descriptor.
1455 * API 7.1.4 SO_LINGER
1457 * An application using the TCP-style socket can use this option to
1458 * perform the SCTP ABORT primitive. The linger option structure is:
1461 * int l_onoff; // option on/off
1462 * int l_linger; // linger time
1465 * To enable the option, set l_onoff to 1. If the l_linger value is set
1466 * to 0, calling close() is the same as the ABORT primitive. If the
1467 * value is set to a negative value, the setsockopt() call will return
1468 * an error. If the value is set to a positive value linger_time, the
1469 * close() can be blocked for at most linger_time ms. If the graceful
1470 * shutdown phase does not finish during this period, close() will
1471 * return but the graceful shutdown phase continues in the system.
1473 static void sctp_close(struct sock *sk, long timeout)
1475 struct net *net = sock_net(sk);
1476 struct sctp_endpoint *ep;
1477 struct sctp_association *asoc;
1478 struct list_head *pos, *temp;
1479 unsigned int data_was_unread;
1481 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1484 sk->sk_shutdown = SHUTDOWN_MASK;
1485 sk->sk_state = SCTP_SS_CLOSING;
1487 ep = sctp_sk(sk)->ep;
1489 /* Clean up any skbs sitting on the receive queue. */
1490 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1491 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1493 /* Walk all associations on an endpoint. */
1494 list_for_each_safe(pos, temp, &ep->asocs) {
1495 asoc = list_entry(pos, struct sctp_association, asocs);
1497 if (sctp_style(sk, TCP)) {
1498 /* A closed association can still be in the list if
1499 * it belongs to a TCP-style listening socket that is
1500 * not yet accepted. If so, free it. If not, send an
1501 * ABORT or SHUTDOWN based on the linger options.
1503 if (sctp_state(asoc, CLOSED)) {
1504 sctp_unhash_established(asoc);
1505 sctp_association_free(asoc);
1510 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1511 !skb_queue_empty(&asoc->ulpq.reasm) ||
1512 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1513 struct sctp_chunk *chunk;
1515 chunk = sctp_make_abort_user(asoc, NULL, 0);
1517 sctp_primitive_ABORT(net, asoc, chunk);
1519 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1522 /* On a TCP-style socket, block for at most linger_time if set. */
1523 if (sctp_style(sk, TCP) && timeout)
1524 sctp_wait_for_close(sk, timeout);
1526 /* This will run the backlog queue. */
1529 /* Supposedly, no process has access to the socket, but
1530 * the net layers still may.
1531 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1532 * held and that should be grabbed before socket lock.
1534 spin_lock_bh(&net->sctp.addr_wq_lock);
1537 /* Hold the sock, since sk_common_release() will put sock_put()
1538 * and we have just a little more cleanup.
1541 sk_common_release(sk);
1544 spin_unlock_bh(&net->sctp.addr_wq_lock);
1548 SCTP_DBG_OBJCNT_DEC(sock);
1551 /* Handle EPIPE error. */
1552 static int sctp_error(struct sock *sk, int flags, int err)
1555 err = sock_error(sk) ? : -EPIPE;
1556 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1557 send_sig(SIGPIPE, current, 0);
1561 /* API 3.1.3 sendmsg() - UDP Style Syntax
1563 * An application uses sendmsg() and recvmsg() calls to transmit data to
1564 * and receive data from its peer.
1566 * ssize_t sendmsg(int socket, const struct msghdr *message,
1569 * socket - the socket descriptor of the endpoint.
1570 * message - pointer to the msghdr structure which contains a single
1571 * user message and possibly some ancillary data.
1573 * See Section 5 for complete description of the data
1576 * flags - flags sent or received with the user message, see Section
1577 * 5 for complete description of the flags.
1579 * Note: This function could use a rewrite especially when explicit
1580 * connect support comes in.
1582 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1584 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1586 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1588 struct net *net = sock_net(sk);
1589 struct sctp_sock *sp;
1590 struct sctp_endpoint *ep;
1591 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1592 struct sctp_transport *transport, *chunk_tp;
1593 struct sctp_chunk *chunk;
1595 struct sockaddr *msg_name = NULL;
1596 struct sctp_sndrcvinfo default_sinfo;
1597 struct sctp_sndrcvinfo *sinfo;
1598 struct sctp_initmsg *sinit;
1599 sctp_assoc_t associd = 0;
1600 sctp_cmsgs_t cmsgs = { NULL };
1602 bool fill_sinfo_ttl = false, wait_connect = false;
1603 struct sctp_datamsg *datamsg;
1604 int msg_flags = msg->msg_flags;
1605 __u16 sinfo_flags = 0;
1613 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1616 /* We cannot send a message over a TCP-style listening socket. */
1617 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1622 /* Parse out the SCTP CMSGs. */
1623 err = sctp_msghdr_parse(msg, &cmsgs);
1625 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1629 /* Fetch the destination address for this packet. This
1630 * address only selects the association--it is not necessarily
1631 * the address we will send to.
1632 * For a peeled-off socket, msg_name is ignored.
1634 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1635 int msg_namelen = msg->msg_namelen;
1637 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1642 if (msg_namelen > sizeof(to))
1643 msg_namelen = sizeof(to);
1644 memcpy(&to, msg->msg_name, msg_namelen);
1645 msg_name = msg->msg_name;
1649 if (cmsgs.sinfo != NULL) {
1650 memset(&default_sinfo, 0, sizeof(default_sinfo));
1651 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1652 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1653 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1654 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1655 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1657 sinfo = &default_sinfo;
1658 fill_sinfo_ttl = true;
1660 sinfo = cmsgs.srinfo;
1662 /* Did the user specify SNDINFO/SNDRCVINFO? */
1664 sinfo_flags = sinfo->sinfo_flags;
1665 associd = sinfo->sinfo_assoc_id;
1668 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1669 msg_len, sinfo_flags);
1671 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1672 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1677 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1678 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1679 * If SCTP_ABORT is set, the message length could be non zero with
1680 * the msg_iov set to the user abort reason.
1682 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1683 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1688 /* If SCTP_ADDR_OVER is set, there must be an address
1689 * specified in msg_name.
1691 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1698 pr_debug("%s: about to look up association\n", __func__);
1702 /* If a msg_name has been specified, assume this is to be used. */
1704 /* Look for a matching association on the endpoint. */
1705 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1707 /* If we could not find a matching association on the
1708 * endpoint, make sure that it is not a TCP-style
1709 * socket that already has an association or there is
1710 * no peeled-off association on another socket.
1712 if ((sctp_style(sk, TCP) &&
1713 sctp_sstate(sk, ESTABLISHED)) ||
1714 sctp_endpoint_is_peeled_off(ep, &to)) {
1715 err = -EADDRNOTAVAIL;
1720 asoc = sctp_id2assoc(sk, associd);
1728 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1730 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1731 * socket that has an association in CLOSED state. This can
1732 * happen when an accepted socket has an association that is
1735 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1740 if (sinfo_flags & SCTP_EOF) {
1741 pr_debug("%s: shutting down association:%p\n",
1744 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1748 if (sinfo_flags & SCTP_ABORT) {
1750 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1756 pr_debug("%s: aborting association:%p\n",
1759 sctp_primitive_ABORT(net, asoc, chunk);
1765 /* Do we need to create the association? */
1767 pr_debug("%s: there is no association yet\n", __func__);
1769 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1774 /* Check for invalid stream against the stream counts,
1775 * either the default or the user specified stream counts.
1778 if (!sinit || !sinit->sinit_num_ostreams) {
1779 /* Check against the defaults. */
1780 if (sinfo->sinfo_stream >=
1781 sp->initmsg.sinit_num_ostreams) {
1786 /* Check against the requested. */
1787 if (sinfo->sinfo_stream >=
1788 sinit->sinit_num_ostreams) {
1796 * API 3.1.2 bind() - UDP Style Syntax
1797 * If a bind() or sctp_bindx() is not called prior to a
1798 * sendmsg() call that initiates a new association, the
1799 * system picks an ephemeral port and will choose an address
1800 * set equivalent to binding with a wildcard address.
1802 if (!ep->base.bind_addr.port) {
1803 if (sctp_autobind(sk)) {
1809 * If an unprivileged user inherits a one-to-many
1810 * style socket with open associations on a privileged
1811 * port, it MAY be permitted to accept new associations,
1812 * but it SHOULD NOT be permitted to open new
1815 if (ep->base.bind_addr.port < PROT_SOCK &&
1816 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1822 scope = sctp_scope(&to);
1823 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1829 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1835 /* If the SCTP_INIT ancillary data is specified, set all
1836 * the association init values accordingly.
1839 if (sinit->sinit_num_ostreams) {
1840 asoc->c.sinit_num_ostreams =
1841 sinit->sinit_num_ostreams;
1843 if (sinit->sinit_max_instreams) {
1844 asoc->c.sinit_max_instreams =
1845 sinit->sinit_max_instreams;
1847 if (sinit->sinit_max_attempts) {
1848 asoc->max_init_attempts
1849 = sinit->sinit_max_attempts;
1851 if (sinit->sinit_max_init_timeo) {
1852 asoc->max_init_timeo =
1853 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1857 /* Prime the peer's transport structures. */
1858 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1865 /* ASSERT: we have a valid association at this point. */
1866 pr_debug("%s: we have a valid association\n", __func__);
1869 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1870 * one with some defaults.
1872 memset(&default_sinfo, 0, sizeof(default_sinfo));
1873 default_sinfo.sinfo_stream = asoc->default_stream;
1874 default_sinfo.sinfo_flags = asoc->default_flags;
1875 default_sinfo.sinfo_ppid = asoc->default_ppid;
1876 default_sinfo.sinfo_context = asoc->default_context;
1877 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1878 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1880 sinfo = &default_sinfo;
1881 } else if (fill_sinfo_ttl) {
1882 /* In case SNDINFO was specified, we still need to fill
1883 * it with a default ttl from the assoc here.
1885 sinfo->sinfo_timetolive = asoc->default_timetolive;
1888 /* API 7.1.7, the sndbuf size per association bounds the
1889 * maximum size of data that can be sent in a single send call.
1891 if (msg_len > sk->sk_sndbuf) {
1896 if (asoc->pmtu_pending)
1897 sctp_assoc_pending_pmtu(sk, asoc);
1899 /* If fragmentation is disabled and the message length exceeds the
1900 * association fragmentation point, return EMSGSIZE. The I-D
1901 * does not specify what this error is, but this looks like
1904 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1909 /* Check for invalid stream. */
1910 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1915 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1916 if (!sctp_wspace(asoc)) {
1917 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1922 /* If an address is passed with the sendto/sendmsg call, it is used
1923 * to override the primary destination address in the TCP model, or
1924 * when SCTP_ADDR_OVER flag is set in the UDP model.
1926 if ((sctp_style(sk, TCP) && msg_name) ||
1927 (sinfo_flags & SCTP_ADDR_OVER)) {
1928 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1936 /* Auto-connect, if we aren't connected already. */
1937 if (sctp_state(asoc, CLOSED)) {
1938 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1942 wait_connect = true;
1943 pr_debug("%s: we associated primitively\n", __func__);
1946 /* Break the message into multiple chunks of maximum size. */
1947 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1948 if (IS_ERR(datamsg)) {
1949 err = PTR_ERR(datamsg);
1953 /* Now send the (possibly) fragmented message. */
1954 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1955 sctp_chunk_hold(chunk);
1957 /* Do accounting for the write space. */
1958 sctp_set_owner_w(chunk);
1960 chunk->transport = chunk_tp;
1963 /* Send it to the lower layers. Note: all chunks
1964 * must either fail or succeed. The lower layer
1965 * works that way today. Keep it that way or this
1968 err = sctp_primitive_SEND(net, asoc, datamsg);
1969 /* Did the lower layer accept the chunk? */
1971 sctp_datamsg_free(datamsg);
1975 pr_debug("%s: we sent primitively\n", __func__);
1977 sctp_datamsg_put(datamsg);
1980 if (unlikely(wait_connect)) {
1981 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
1982 sctp_wait_for_connect(asoc, &timeo);
1985 /* If we are already past ASSOCIATE, the lower
1986 * layers are responsible for association cleanup.
1992 sctp_unhash_established(asoc);
1993 sctp_association_free(asoc);
1999 return sctp_error(sk, msg_flags, err);
2006 err = sock_error(sk);
2016 /* This is an extended version of skb_pull() that removes the data from the
2017 * start of a skb even when data is spread across the list of skb's in the
2018 * frag_list. len specifies the total amount of data that needs to be removed.
2019 * when 'len' bytes could be removed from the skb, it returns 0.
2020 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2021 * could not be removed.
2023 static int sctp_skb_pull(struct sk_buff *skb, int len)
2025 struct sk_buff *list;
2026 int skb_len = skb_headlen(skb);
2029 if (len <= skb_len) {
2030 __skb_pull(skb, len);
2034 __skb_pull(skb, skb_len);
2036 skb_walk_frags(skb, list) {
2037 rlen = sctp_skb_pull(list, len);
2038 skb->len -= (len-rlen);
2039 skb->data_len -= (len-rlen);
2050 /* API 3.1.3 recvmsg() - UDP Style Syntax
2052 * ssize_t recvmsg(int socket, struct msghdr *message,
2055 * socket - the socket descriptor of the endpoint.
2056 * message - pointer to the msghdr structure which contains a single
2057 * user message and possibly some ancillary data.
2059 * See Section 5 for complete description of the data
2062 * flags - flags sent or received with the user message, see Section
2063 * 5 for complete description of the flags.
2065 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2066 int noblock, int flags, int *addr_len)
2068 struct sctp_ulpevent *event = NULL;
2069 struct sctp_sock *sp = sctp_sk(sk);
2070 struct sk_buff *skb;
2075 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2076 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2081 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2086 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2090 /* Get the total length of the skb including any skb's in the
2099 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2101 event = sctp_skb2event(skb);
2106 sock_recv_ts_and_drops(msg, sk, skb);
2107 if (sctp_ulpevent_is_notification(event)) {
2108 msg->msg_flags |= MSG_NOTIFICATION;
2109 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2111 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2114 /* Check if we allow SCTP_NXTINFO. */
2115 if (sp->recvnxtinfo)
2116 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2117 /* Check if we allow SCTP_RCVINFO. */
2118 if (sp->recvrcvinfo)
2119 sctp_ulpevent_read_rcvinfo(event, msg);
2120 /* Check if we allow SCTP_SNDRCVINFO. */
2121 if (sp->subscribe.sctp_data_io_event)
2122 sctp_ulpevent_read_sndrcvinfo(event, msg);
2126 /* If skb's length exceeds the user's buffer, update the skb and
2127 * push it back to the receive_queue so that the next call to
2128 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2130 if (skb_len > copied) {
2131 msg->msg_flags &= ~MSG_EOR;
2132 if (flags & MSG_PEEK)
2134 sctp_skb_pull(skb, copied);
2135 skb_queue_head(&sk->sk_receive_queue, skb);
2137 /* When only partial message is copied to the user, increase
2138 * rwnd by that amount. If all the data in the skb is read,
2139 * rwnd is updated when the event is freed.
2141 if (!sctp_ulpevent_is_notification(event))
2142 sctp_assoc_rwnd_increase(event->asoc, copied);
2144 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2145 (event->msg_flags & MSG_EOR))
2146 msg->msg_flags |= MSG_EOR;
2148 msg->msg_flags &= ~MSG_EOR;
2151 if (flags & MSG_PEEK) {
2152 /* Release the skb reference acquired after peeking the skb in
2153 * sctp_skb_recv_datagram().
2157 /* Free the event which includes releasing the reference to
2158 * the owner of the skb, freeing the skb and updating the
2161 sctp_ulpevent_free(event);
2168 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2170 * This option is a on/off flag. If enabled no SCTP message
2171 * fragmentation will be performed. Instead if a message being sent
2172 * exceeds the current PMTU size, the message will NOT be sent and
2173 * instead a error will be indicated to the user.
2175 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2176 char __user *optval,
2177 unsigned int optlen)
2181 if (optlen < sizeof(int))
2184 if (get_user(val, (int __user *)optval))
2187 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2192 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2193 unsigned int optlen)
2195 struct sctp_association *asoc;
2196 struct sctp_ulpevent *event;
2198 if (optlen > sizeof(struct sctp_event_subscribe))
2200 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2203 if (sctp_sk(sk)->subscribe.sctp_data_io_event)
2204 pr_warn_ratelimited(DEPRECATED "%s (pid %d) "
2205 "Requested SCTP_SNDRCVINFO event.\n"
2206 "Use SCTP_RCVINFO through SCTP_RECVRCVINFO option instead.\n",
2207 current->comm, task_pid_nr(current));
2209 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2210 * if there is no data to be sent or retransmit, the stack will
2211 * immediately send up this notification.
2213 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2214 &sctp_sk(sk)->subscribe)) {
2215 asoc = sctp_id2assoc(sk, 0);
2217 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2218 event = sctp_ulpevent_make_sender_dry_event(asoc,
2223 sctp_ulpq_tail_event(&asoc->ulpq, event);
2230 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2232 * This socket option is applicable to the UDP-style socket only. When
2233 * set it will cause associations that are idle for more than the
2234 * specified number of seconds to automatically close. An association
2235 * being idle is defined an association that has NOT sent or received
2236 * user data. The special value of '0' indicates that no automatic
2237 * close of any associations should be performed. The option expects an
2238 * integer defining the number of seconds of idle time before an
2239 * association is closed.
2241 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2242 unsigned int optlen)
2244 struct sctp_sock *sp = sctp_sk(sk);
2245 struct net *net = sock_net(sk);
2247 /* Applicable to UDP-style socket only */
2248 if (sctp_style(sk, TCP))
2250 if (optlen != sizeof(int))
2252 if (copy_from_user(&sp->autoclose, optval, optlen))
2255 if (sp->autoclose > net->sctp.max_autoclose)
2256 sp->autoclose = net->sctp.max_autoclose;
2261 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2263 * Applications can enable or disable heartbeats for any peer address of
2264 * an association, modify an address's heartbeat interval, force a
2265 * heartbeat to be sent immediately, and adjust the address's maximum
2266 * number of retransmissions sent before an address is considered
2267 * unreachable. The following structure is used to access and modify an
2268 * address's parameters:
2270 * struct sctp_paddrparams {
2271 * sctp_assoc_t spp_assoc_id;
2272 * struct sockaddr_storage spp_address;
2273 * uint32_t spp_hbinterval;
2274 * uint16_t spp_pathmaxrxt;
2275 * uint32_t spp_pathmtu;
2276 * uint32_t spp_sackdelay;
2277 * uint32_t spp_flags;
2280 * spp_assoc_id - (one-to-many style socket) This is filled in the
2281 * application, and identifies the association for
2283 * spp_address - This specifies which address is of interest.
2284 * spp_hbinterval - This contains the value of the heartbeat interval,
2285 * in milliseconds. If a value of zero
2286 * is present in this field then no changes are to
2287 * be made to this parameter.
2288 * spp_pathmaxrxt - This contains the maximum number of
2289 * retransmissions before this address shall be
2290 * considered unreachable. If a value of zero
2291 * is present in this field then no changes are to
2292 * be made to this parameter.
2293 * spp_pathmtu - When Path MTU discovery is disabled the value
2294 * specified here will be the "fixed" path mtu.
2295 * Note that if the spp_address field is empty
2296 * then all associations on this address will
2297 * have this fixed path mtu set upon them.
2299 * spp_sackdelay - When delayed sack is enabled, this value specifies
2300 * the number of milliseconds that sacks will be delayed
2301 * for. This value will apply to all addresses of an
2302 * association if the spp_address field is empty. Note
2303 * also, that if delayed sack is enabled and this
2304 * value is set to 0, no change is made to the last
2305 * recorded delayed sack timer value.
2307 * spp_flags - These flags are used to control various features
2308 * on an association. The flag field may contain
2309 * zero or more of the following options.
2311 * SPP_HB_ENABLE - Enable heartbeats on the
2312 * specified address. Note that if the address
2313 * field is empty all addresses for the association
2314 * have heartbeats enabled upon them.
2316 * SPP_HB_DISABLE - Disable heartbeats on the
2317 * speicifed address. Note that if the address
2318 * field is empty all addresses for the association
2319 * will have their heartbeats disabled. Note also
2320 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2321 * mutually exclusive, only one of these two should
2322 * be specified. Enabling both fields will have
2323 * undetermined results.
2325 * SPP_HB_DEMAND - Request a user initiated heartbeat
2326 * to be made immediately.
2328 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2329 * heartbeat delayis to be set to the value of 0
2332 * SPP_PMTUD_ENABLE - This field will enable PMTU
2333 * discovery upon the specified address. Note that
2334 * if the address feild is empty then all addresses
2335 * on the association are effected.
2337 * SPP_PMTUD_DISABLE - This field will disable PMTU
2338 * discovery upon the specified address. Note that
2339 * if the address feild is empty then all addresses
2340 * on the association are effected. Not also that
2341 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2342 * exclusive. Enabling both will have undetermined
2345 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2346 * on delayed sack. The time specified in spp_sackdelay
2347 * is used to specify the sack delay for this address. Note
2348 * that if spp_address is empty then all addresses will
2349 * enable delayed sack and take on the sack delay
2350 * value specified in spp_sackdelay.
2351 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2352 * off delayed sack. If the spp_address field is blank then
2353 * delayed sack is disabled for the entire association. Note
2354 * also that this field is mutually exclusive to
2355 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2358 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2359 struct sctp_transport *trans,
2360 struct sctp_association *asoc,
2361 struct sctp_sock *sp,
2364 int sackdelay_change)
2368 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2369 struct net *net = sock_net(trans->asoc->base.sk);
2371 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2376 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2377 * this field is ignored. Note also that a value of zero indicates
2378 * the current setting should be left unchanged.
2380 if (params->spp_flags & SPP_HB_ENABLE) {
2382 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2383 * set. This lets us use 0 value when this flag
2386 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2387 params->spp_hbinterval = 0;
2389 if (params->spp_hbinterval ||
2390 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2393 msecs_to_jiffies(params->spp_hbinterval);
2396 msecs_to_jiffies(params->spp_hbinterval);
2398 sp->hbinterval = params->spp_hbinterval;
2405 trans->param_flags =
2406 (trans->param_flags & ~SPP_HB) | hb_change;
2409 (asoc->param_flags & ~SPP_HB) | hb_change;
2412 (sp->param_flags & ~SPP_HB) | hb_change;
2416 /* When Path MTU discovery is disabled the value specified here will
2417 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2418 * include the flag SPP_PMTUD_DISABLE for this field to have any
2421 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2423 trans->pathmtu = params->spp_pathmtu;
2424 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2426 asoc->pathmtu = params->spp_pathmtu;
2427 sctp_frag_point(asoc, params->spp_pathmtu);
2429 sp->pathmtu = params->spp_pathmtu;
2435 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2436 (params->spp_flags & SPP_PMTUD_ENABLE);
2437 trans->param_flags =
2438 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2440 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2441 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2445 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2448 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2452 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2453 * value of this field is ignored. Note also that a value of zero
2454 * indicates the current setting should be left unchanged.
2456 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2459 msecs_to_jiffies(params->spp_sackdelay);
2462 msecs_to_jiffies(params->spp_sackdelay);
2464 sp->sackdelay = params->spp_sackdelay;
2468 if (sackdelay_change) {
2470 trans->param_flags =
2471 (trans->param_flags & ~SPP_SACKDELAY) |
2475 (asoc->param_flags & ~SPP_SACKDELAY) |
2479 (sp->param_flags & ~SPP_SACKDELAY) |
2484 /* Note that a value of zero indicates the current setting should be
2487 if (params->spp_pathmaxrxt) {
2489 trans->pathmaxrxt = params->spp_pathmaxrxt;
2491 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2493 sp->pathmaxrxt = params->spp_pathmaxrxt;
2500 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2501 char __user *optval,
2502 unsigned int optlen)
2504 struct sctp_paddrparams params;
2505 struct sctp_transport *trans = NULL;
2506 struct sctp_association *asoc = NULL;
2507 struct sctp_sock *sp = sctp_sk(sk);
2509 int hb_change, pmtud_change, sackdelay_change;
2511 if (optlen != sizeof(struct sctp_paddrparams))
2514 if (copy_from_user(¶ms, optval, optlen))
2517 /* Validate flags and value parameters. */
2518 hb_change = params.spp_flags & SPP_HB;
2519 pmtud_change = params.spp_flags & SPP_PMTUD;
2520 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2522 if (hb_change == SPP_HB ||
2523 pmtud_change == SPP_PMTUD ||
2524 sackdelay_change == SPP_SACKDELAY ||
2525 params.spp_sackdelay > 500 ||
2526 (params.spp_pathmtu &&
2527 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2530 /* If an address other than INADDR_ANY is specified, and
2531 * no transport is found, then the request is invalid.
2533 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2534 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2535 params.spp_assoc_id);
2540 /* Get association, if assoc_id != 0 and the socket is a one
2541 * to many style socket, and an association was not found, then
2542 * the id was invalid.
2544 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2545 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2548 /* Heartbeat demand can only be sent on a transport or
2549 * association, but not a socket.
2551 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2554 /* Process parameters. */
2555 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2556 hb_change, pmtud_change,
2562 /* If changes are for association, also apply parameters to each
2565 if (!trans && asoc) {
2566 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2568 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2569 hb_change, pmtud_change,
2577 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2579 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2582 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2584 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2588 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2590 * This option will effect the way delayed acks are performed. This
2591 * option allows you to get or set the delayed ack time, in
2592 * milliseconds. It also allows changing the delayed ack frequency.
2593 * Changing the frequency to 1 disables the delayed sack algorithm. If
2594 * the assoc_id is 0, then this sets or gets the endpoints default
2595 * values. If the assoc_id field is non-zero, then the set or get
2596 * effects the specified association for the one to many model (the
2597 * assoc_id field is ignored by the one to one model). Note that if
2598 * sack_delay or sack_freq are 0 when setting this option, then the
2599 * current values will remain unchanged.
2601 * struct sctp_sack_info {
2602 * sctp_assoc_t sack_assoc_id;
2603 * uint32_t sack_delay;
2604 * uint32_t sack_freq;
2607 * sack_assoc_id - This parameter, indicates which association the user
2608 * is performing an action upon. Note that if this field's value is
2609 * zero then the endpoints default value is changed (effecting future
2610 * associations only).
2612 * sack_delay - This parameter contains the number of milliseconds that
2613 * the user is requesting the delayed ACK timer be set to. Note that
2614 * this value is defined in the standard to be between 200 and 500
2617 * sack_freq - This parameter contains the number of packets that must
2618 * be received before a sack is sent without waiting for the delay
2619 * timer to expire. The default value for this is 2, setting this
2620 * value to 1 will disable the delayed sack algorithm.
2623 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2624 char __user *optval, unsigned int optlen)
2626 struct sctp_sack_info params;
2627 struct sctp_transport *trans = NULL;
2628 struct sctp_association *asoc = NULL;
2629 struct sctp_sock *sp = sctp_sk(sk);
2631 if (optlen == sizeof(struct sctp_sack_info)) {
2632 if (copy_from_user(¶ms, optval, optlen))
2635 if (params.sack_delay == 0 && params.sack_freq == 0)
2637 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2638 pr_warn_ratelimited(DEPRECATED
2640 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2641 "Use struct sctp_sack_info instead\n",
2642 current->comm, task_pid_nr(current));
2643 if (copy_from_user(¶ms, optval, optlen))
2646 if (params.sack_delay == 0)
2647 params.sack_freq = 1;
2649 params.sack_freq = 0;
2653 /* Validate value parameter. */
2654 if (params.sack_delay > 500)
2657 /* Get association, if sack_assoc_id != 0 and the socket is a one
2658 * to many style socket, and an association was not found, then
2659 * the id was invalid.
2661 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2662 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2665 if (params.sack_delay) {
2668 msecs_to_jiffies(params.sack_delay);
2670 sctp_spp_sackdelay_enable(asoc->param_flags);
2672 sp->sackdelay = params.sack_delay;
2674 sctp_spp_sackdelay_enable(sp->param_flags);
2678 if (params.sack_freq == 1) {
2681 sctp_spp_sackdelay_disable(asoc->param_flags);
2684 sctp_spp_sackdelay_disable(sp->param_flags);
2686 } else if (params.sack_freq > 1) {
2688 asoc->sackfreq = params.sack_freq;
2690 sctp_spp_sackdelay_enable(asoc->param_flags);
2692 sp->sackfreq = params.sack_freq;
2694 sctp_spp_sackdelay_enable(sp->param_flags);
2698 /* If change is for association, also apply to each transport. */
2700 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2702 if (params.sack_delay) {
2704 msecs_to_jiffies(params.sack_delay);
2705 trans->param_flags =
2706 sctp_spp_sackdelay_enable(trans->param_flags);
2708 if (params.sack_freq == 1) {
2709 trans->param_flags =
2710 sctp_spp_sackdelay_disable(trans->param_flags);
2711 } else if (params.sack_freq > 1) {
2712 trans->sackfreq = params.sack_freq;
2713 trans->param_flags =
2714 sctp_spp_sackdelay_enable(trans->param_flags);
2722 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2724 * Applications can specify protocol parameters for the default association
2725 * initialization. The option name argument to setsockopt() and getsockopt()
2728 * Setting initialization parameters is effective only on an unconnected
2729 * socket (for UDP-style sockets only future associations are effected
2730 * by the change). With TCP-style sockets, this option is inherited by
2731 * sockets derived from a listener socket.
2733 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2735 struct sctp_initmsg sinit;
2736 struct sctp_sock *sp = sctp_sk(sk);
2738 if (optlen != sizeof(struct sctp_initmsg))
2740 if (copy_from_user(&sinit, optval, optlen))
2743 if (sinit.sinit_num_ostreams)
2744 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2745 if (sinit.sinit_max_instreams)
2746 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2747 if (sinit.sinit_max_attempts)
2748 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2749 if (sinit.sinit_max_init_timeo)
2750 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2756 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2758 * Applications that wish to use the sendto() system call may wish to
2759 * specify a default set of parameters that would normally be supplied
2760 * through the inclusion of ancillary data. This socket option allows
2761 * such an application to set the default sctp_sndrcvinfo structure.
2762 * The application that wishes to use this socket option simply passes
2763 * in to this call the sctp_sndrcvinfo structure defined in Section
2764 * 5.2.2) The input parameters accepted by this call include
2765 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2766 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2767 * to this call if the caller is using the UDP model.
2769 static int sctp_setsockopt_default_send_param(struct sock *sk,
2770 char __user *optval,
2771 unsigned int optlen)
2773 struct sctp_sock *sp = sctp_sk(sk);
2774 struct sctp_association *asoc;
2775 struct sctp_sndrcvinfo info;
2777 if (optlen != sizeof(info))
2779 if (copy_from_user(&info, optval, optlen))
2781 if (info.sinfo_flags &
2782 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2783 SCTP_ABORT | SCTP_EOF))
2786 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2787 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2790 asoc->default_stream = info.sinfo_stream;
2791 asoc->default_flags = info.sinfo_flags;
2792 asoc->default_ppid = info.sinfo_ppid;
2793 asoc->default_context = info.sinfo_context;
2794 asoc->default_timetolive = info.sinfo_timetolive;
2796 sp->default_stream = info.sinfo_stream;
2797 sp->default_flags = info.sinfo_flags;
2798 sp->default_ppid = info.sinfo_ppid;
2799 sp->default_context = info.sinfo_context;
2800 sp->default_timetolive = info.sinfo_timetolive;
2806 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2807 * (SCTP_DEFAULT_SNDINFO)
2809 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2810 char __user *optval,
2811 unsigned int optlen)
2813 struct sctp_sock *sp = sctp_sk(sk);
2814 struct sctp_association *asoc;
2815 struct sctp_sndinfo info;
2817 if (optlen != sizeof(info))
2819 if (copy_from_user(&info, optval, optlen))
2821 if (info.snd_flags &
2822 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2823 SCTP_ABORT | SCTP_EOF))
2826 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2827 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2830 asoc->default_stream = info.snd_sid;
2831 asoc->default_flags = info.snd_flags;
2832 asoc->default_ppid = info.snd_ppid;
2833 asoc->default_context = info.snd_context;
2835 sp->default_stream = info.snd_sid;
2836 sp->default_flags = info.snd_flags;
2837 sp->default_ppid = info.snd_ppid;
2838 sp->default_context = info.snd_context;
2844 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2846 * Requests that the local SCTP stack use the enclosed peer address as
2847 * the association primary. The enclosed address must be one of the
2848 * association peer's addresses.
2850 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2851 unsigned int optlen)
2853 struct sctp_prim prim;
2854 struct sctp_transport *trans;
2856 if (optlen != sizeof(struct sctp_prim))
2859 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2862 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2866 sctp_assoc_set_primary(trans->asoc, trans);
2872 * 7.1.5 SCTP_NODELAY
2874 * Turn on/off any Nagle-like algorithm. This means that packets are
2875 * generally sent as soon as possible and no unnecessary delays are
2876 * introduced, at the cost of more packets in the network. Expects an
2877 * integer boolean flag.
2879 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2880 unsigned int optlen)
2884 if (optlen < sizeof(int))
2886 if (get_user(val, (int __user *)optval))
2889 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2895 * 7.1.1 SCTP_RTOINFO
2897 * The protocol parameters used to initialize and bound retransmission
2898 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2899 * and modify these parameters.
2900 * All parameters are time values, in milliseconds. A value of 0, when
2901 * modifying the parameters, indicates that the current value should not
2905 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2907 struct sctp_rtoinfo rtoinfo;
2908 struct sctp_association *asoc;
2909 unsigned long rto_min, rto_max;
2910 struct sctp_sock *sp = sctp_sk(sk);
2912 if (optlen != sizeof (struct sctp_rtoinfo))
2915 if (copy_from_user(&rtoinfo, optval, optlen))
2918 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2920 /* Set the values to the specific association */
2921 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2924 rto_max = rtoinfo.srto_max;
2925 rto_min = rtoinfo.srto_min;
2928 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2930 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2933 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2935 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2937 if (rto_min > rto_max)
2941 if (rtoinfo.srto_initial != 0)
2943 msecs_to_jiffies(rtoinfo.srto_initial);
2944 asoc->rto_max = rto_max;
2945 asoc->rto_min = rto_min;
2947 /* If there is no association or the association-id = 0
2948 * set the values to the endpoint.
2950 if (rtoinfo.srto_initial != 0)
2951 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2952 sp->rtoinfo.srto_max = rto_max;
2953 sp->rtoinfo.srto_min = rto_min;
2961 * 7.1.2 SCTP_ASSOCINFO
2963 * This option is used to tune the maximum retransmission attempts
2964 * of the association.
2965 * Returns an error if the new association retransmission value is
2966 * greater than the sum of the retransmission value of the peer.
2967 * See [SCTP] for more information.
2970 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2973 struct sctp_assocparams assocparams;
2974 struct sctp_association *asoc;
2976 if (optlen != sizeof(struct sctp_assocparams))
2978 if (copy_from_user(&assocparams, optval, optlen))
2981 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2983 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2986 /* Set the values to the specific association */
2988 if (assocparams.sasoc_asocmaxrxt != 0) {
2991 struct sctp_transport *peer_addr;
2993 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2995 path_sum += peer_addr->pathmaxrxt;
2999 /* Only validate asocmaxrxt if we have more than
3000 * one path/transport. We do this because path
3001 * retransmissions are only counted when we have more
3005 assocparams.sasoc_asocmaxrxt > path_sum)
3008 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3011 if (assocparams.sasoc_cookie_life != 0)
3012 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3014 /* Set the values to the endpoint */
3015 struct sctp_sock *sp = sctp_sk(sk);
3017 if (assocparams.sasoc_asocmaxrxt != 0)
3018 sp->assocparams.sasoc_asocmaxrxt =
3019 assocparams.sasoc_asocmaxrxt;
3020 if (assocparams.sasoc_cookie_life != 0)
3021 sp->assocparams.sasoc_cookie_life =
3022 assocparams.sasoc_cookie_life;
3028 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3030 * This socket option is a boolean flag which turns on or off mapped V4
3031 * addresses. If this option is turned on and the socket is type
3032 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3033 * If this option is turned off, then no mapping will be done of V4
3034 * addresses and a user will receive both PF_INET6 and PF_INET type
3035 * addresses on the socket.
3037 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3040 struct sctp_sock *sp = sctp_sk(sk);
3042 if (optlen < sizeof(int))
3044 if (get_user(val, (int __user *)optval))
3055 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3056 * This option will get or set the maximum size to put in any outgoing
3057 * SCTP DATA chunk. If a message is larger than this size it will be
3058 * fragmented by SCTP into the specified size. Note that the underlying
3059 * SCTP implementation may fragment into smaller sized chunks when the
3060 * PMTU of the underlying association is smaller than the value set by
3061 * the user. The default value for this option is '0' which indicates
3062 * the user is NOT limiting fragmentation and only the PMTU will effect
3063 * SCTP's choice of DATA chunk size. Note also that values set larger
3064 * than the maximum size of an IP datagram will effectively let SCTP
3065 * control fragmentation (i.e. the same as setting this option to 0).
3067 * The following structure is used to access and modify this parameter:
3069 * struct sctp_assoc_value {
3070 * sctp_assoc_t assoc_id;
3071 * uint32_t assoc_value;
3074 * assoc_id: This parameter is ignored for one-to-one style sockets.
3075 * For one-to-many style sockets this parameter indicates which
3076 * association the user is performing an action upon. Note that if
3077 * this field's value is zero then the endpoints default value is
3078 * changed (effecting future associations only).
3079 * assoc_value: This parameter specifies the maximum size in bytes.
3081 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3083 struct sctp_assoc_value params;
3084 struct sctp_association *asoc;
3085 struct sctp_sock *sp = sctp_sk(sk);
3088 if (optlen == sizeof(int)) {
3089 pr_warn_ratelimited(DEPRECATED
3091 "Use of int in maxseg socket option.\n"
3092 "Use struct sctp_assoc_value instead\n",
3093 current->comm, task_pid_nr(current));
3094 if (copy_from_user(&val, optval, optlen))
3096 params.assoc_id = 0;
3097 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3098 if (copy_from_user(¶ms, optval, optlen))
3100 val = params.assoc_value;
3104 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3107 asoc = sctp_id2assoc(sk, params.assoc_id);
3108 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3113 val = asoc->pathmtu;
3114 val -= sp->pf->af->net_header_len;
3115 val -= sizeof(struct sctphdr) +
3116 sizeof(struct sctp_data_chunk);
3118 asoc->user_frag = val;
3119 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3121 sp->user_frag = val;
3129 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3131 * Requests that the peer mark the enclosed address as the association
3132 * primary. The enclosed address must be one of the association's
3133 * locally bound addresses. The following structure is used to make a
3134 * set primary request:
3136 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3137 unsigned int optlen)
3139 struct net *net = sock_net(sk);
3140 struct sctp_sock *sp;
3141 struct sctp_association *asoc = NULL;
3142 struct sctp_setpeerprim prim;
3143 struct sctp_chunk *chunk;
3149 if (!net->sctp.addip_enable)
3152 if (optlen != sizeof(struct sctp_setpeerprim))
3155 if (copy_from_user(&prim, optval, optlen))
3158 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3162 if (!asoc->peer.asconf_capable)
3165 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3168 if (!sctp_state(asoc, ESTABLISHED))
3171 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3175 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3176 return -EADDRNOTAVAIL;
3178 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3179 return -EADDRNOTAVAIL;
3181 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3182 chunk = sctp_make_asconf_set_prim(asoc,
3183 (union sctp_addr *)&prim.sspp_addr);
3187 err = sctp_send_asconf(asoc, chunk);
3189 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3194 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3195 unsigned int optlen)
3197 struct sctp_setadaptation adaptation;
3199 if (optlen != sizeof(struct sctp_setadaptation))
3201 if (copy_from_user(&adaptation, optval, optlen))
3204 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3210 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3212 * The context field in the sctp_sndrcvinfo structure is normally only
3213 * used when a failed message is retrieved holding the value that was
3214 * sent down on the actual send call. This option allows the setting of
3215 * a default context on an association basis that will be received on
3216 * reading messages from the peer. This is especially helpful in the
3217 * one-2-many model for an application to keep some reference to an
3218 * internal state machine that is processing messages on the
3219 * association. Note that the setting of this value only effects
3220 * received messages from the peer and does not effect the value that is
3221 * saved with outbound messages.
3223 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3224 unsigned int optlen)
3226 struct sctp_assoc_value params;
3227 struct sctp_sock *sp;
3228 struct sctp_association *asoc;
3230 if (optlen != sizeof(struct sctp_assoc_value))
3232 if (copy_from_user(¶ms, optval, optlen))
3237 if (params.assoc_id != 0) {
3238 asoc = sctp_id2assoc(sk, params.assoc_id);
3241 asoc->default_rcv_context = params.assoc_value;
3243 sp->default_rcv_context = params.assoc_value;
3250 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3252 * This options will at a minimum specify if the implementation is doing
3253 * fragmented interleave. Fragmented interleave, for a one to many
3254 * socket, is when subsequent calls to receive a message may return
3255 * parts of messages from different associations. Some implementations
3256 * may allow you to turn this value on or off. If so, when turned off,
3257 * no fragment interleave will occur (which will cause a head of line
3258 * blocking amongst multiple associations sharing the same one to many
3259 * socket). When this option is turned on, then each receive call may
3260 * come from a different association (thus the user must receive data
3261 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3262 * association each receive belongs to.
3264 * This option takes a boolean value. A non-zero value indicates that
3265 * fragmented interleave is on. A value of zero indicates that
3266 * fragmented interleave is off.
3268 * Note that it is important that an implementation that allows this
3269 * option to be turned on, have it off by default. Otherwise an unaware
3270 * application using the one to many model may become confused and act
3273 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3274 char __user *optval,
3275 unsigned int optlen)
3279 if (optlen != sizeof(int))
3281 if (get_user(val, (int __user *)optval))
3284 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3290 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3291 * (SCTP_PARTIAL_DELIVERY_POINT)
3293 * This option will set or get the SCTP partial delivery point. This
3294 * point is the size of a message where the partial delivery API will be
3295 * invoked to help free up rwnd space for the peer. Setting this to a
3296 * lower value will cause partial deliveries to happen more often. The
3297 * calls argument is an integer that sets or gets the partial delivery
3298 * point. Note also that the call will fail if the user attempts to set
3299 * this value larger than the socket receive buffer size.
3301 * Note that any single message having a length smaller than or equal to
3302 * the SCTP partial delivery point will be delivered in one single read
3303 * call as long as the user provided buffer is large enough to hold the
3306 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3307 char __user *optval,
3308 unsigned int optlen)
3312 if (optlen != sizeof(u32))
3314 if (get_user(val, (int __user *)optval))
3317 /* Note: We double the receive buffer from what the user sets
3318 * it to be, also initial rwnd is based on rcvbuf/2.
3320 if (val > (sk->sk_rcvbuf >> 1))
3323 sctp_sk(sk)->pd_point = val;
3325 return 0; /* is this the right error code? */
3329 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3331 * This option will allow a user to change the maximum burst of packets
3332 * that can be emitted by this association. Note that the default value
3333 * is 4, and some implementations may restrict this setting so that it
3334 * can only be lowered.
3336 * NOTE: This text doesn't seem right. Do this on a socket basis with
3337 * future associations inheriting the socket value.
3339 static int sctp_setsockopt_maxburst(struct sock *sk,
3340 char __user *optval,
3341 unsigned int optlen)
3343 struct sctp_assoc_value params;
3344 struct sctp_sock *sp;
3345 struct sctp_association *asoc;
3349 if (optlen == sizeof(int)) {
3350 pr_warn_ratelimited(DEPRECATED
3352 "Use of int in max_burst socket option deprecated.\n"
3353 "Use struct sctp_assoc_value instead\n",
3354 current->comm, task_pid_nr(current));
3355 if (copy_from_user(&val, optval, optlen))
3357 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3358 if (copy_from_user(¶ms, optval, optlen))
3360 val = params.assoc_value;
3361 assoc_id = params.assoc_id;
3367 if (assoc_id != 0) {
3368 asoc = sctp_id2assoc(sk, assoc_id);
3371 asoc->max_burst = val;
3373 sp->max_burst = val;
3379 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3381 * This set option adds a chunk type that the user is requesting to be
3382 * received only in an authenticated way. Changes to the list of chunks
3383 * will only effect future associations on the socket.
3385 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3386 char __user *optval,
3387 unsigned int optlen)
3389 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3390 struct sctp_authchunk val;
3392 if (!ep->auth_enable)
3395 if (optlen != sizeof(struct sctp_authchunk))
3397 if (copy_from_user(&val, optval, optlen))
3400 switch (val.sauth_chunk) {
3402 case SCTP_CID_INIT_ACK:
3403 case SCTP_CID_SHUTDOWN_COMPLETE:
3408 /* add this chunk id to the endpoint */
3409 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3413 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3415 * This option gets or sets the list of HMAC algorithms that the local
3416 * endpoint requires the peer to use.
3418 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3419 char __user *optval,
3420 unsigned int optlen)
3422 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3423 struct sctp_hmacalgo *hmacs;
3427 if (!ep->auth_enable)
3430 if (optlen < sizeof(struct sctp_hmacalgo))
3433 hmacs = memdup_user(optval, optlen);
3435 return PTR_ERR(hmacs);
3437 idents = hmacs->shmac_num_idents;
3438 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3439 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3444 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3451 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3453 * This option will set a shared secret key which is used to build an
3454 * association shared key.
3456 static int sctp_setsockopt_auth_key(struct sock *sk,
3457 char __user *optval,
3458 unsigned int optlen)
3460 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3461 struct sctp_authkey *authkey;
3462 struct sctp_association *asoc;
3465 if (!ep->auth_enable)
3468 if (optlen <= sizeof(struct sctp_authkey))
3471 authkey = memdup_user(optval, optlen);
3472 if (IS_ERR(authkey))
3473 return PTR_ERR(authkey);
3475 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3480 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3481 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3486 ret = sctp_auth_set_key(ep, asoc, authkey);
3493 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3495 * This option will get or set the active shared key to be used to build
3496 * the association shared key.
3498 static int sctp_setsockopt_active_key(struct sock *sk,
3499 char __user *optval,
3500 unsigned int optlen)
3502 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3503 struct sctp_authkeyid val;
3504 struct sctp_association *asoc;
3506 if (!ep->auth_enable)
3509 if (optlen != sizeof(struct sctp_authkeyid))
3511 if (copy_from_user(&val, optval, optlen))
3514 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3515 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3518 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3522 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3524 * This set option will delete a shared secret key from use.
3526 static int sctp_setsockopt_del_key(struct sock *sk,
3527 char __user *optval,
3528 unsigned int optlen)
3530 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3531 struct sctp_authkeyid val;
3532 struct sctp_association *asoc;
3534 if (!ep->auth_enable)
3537 if (optlen != sizeof(struct sctp_authkeyid))
3539 if (copy_from_user(&val, optval, optlen))
3542 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3543 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3546 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3551 * 8.1.23 SCTP_AUTO_ASCONF
3553 * This option will enable or disable the use of the automatic generation of
3554 * ASCONF chunks to add and delete addresses to an existing association. Note
3555 * that this option has two caveats namely: a) it only affects sockets that
3556 * are bound to all addresses available to the SCTP stack, and b) the system
3557 * administrator may have an overriding control that turns the ASCONF feature
3558 * off no matter what setting the socket option may have.
3559 * This option expects an integer boolean flag, where a non-zero value turns on
3560 * the option, and a zero value turns off the option.
3561 * Note. In this implementation, socket operation overrides default parameter
3562 * being set by sysctl as well as FreeBSD implementation
3564 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3565 unsigned int optlen)
3568 struct sctp_sock *sp = sctp_sk(sk);
3570 if (optlen < sizeof(int))
3572 if (get_user(val, (int __user *)optval))
3574 if (!sctp_is_ep_boundall(sk) && val)
3576 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3579 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3580 if (val == 0 && sp->do_auto_asconf) {
3581 list_del(&sp->auto_asconf_list);
3582 sp->do_auto_asconf = 0;
3583 } else if (val && !sp->do_auto_asconf) {
3584 list_add_tail(&sp->auto_asconf_list,
3585 &sock_net(sk)->sctp.auto_asconf_splist);
3586 sp->do_auto_asconf = 1;
3588 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3593 * SCTP_PEER_ADDR_THLDS
3595 * This option allows us to alter the partially failed threshold for one or all
3596 * transports in an association. See Section 6.1 of:
3597 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3599 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3600 char __user *optval,
3601 unsigned int optlen)
3603 struct sctp_paddrthlds val;
3604 struct sctp_transport *trans;
3605 struct sctp_association *asoc;
3607 if (optlen < sizeof(struct sctp_paddrthlds))
3609 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3610 sizeof(struct sctp_paddrthlds)))
3614 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3615 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3618 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3620 if (val.spt_pathmaxrxt)
3621 trans->pathmaxrxt = val.spt_pathmaxrxt;
3622 trans->pf_retrans = val.spt_pathpfthld;
3625 if (val.spt_pathmaxrxt)
3626 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3627 asoc->pf_retrans = val.spt_pathpfthld;
3629 trans = sctp_addr_id2transport(sk, &val.spt_address,
3634 if (val.spt_pathmaxrxt)
3635 trans->pathmaxrxt = val.spt_pathmaxrxt;
3636 trans->pf_retrans = val.spt_pathpfthld;
3642 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3643 char __user *optval,
3644 unsigned int optlen)
3648 if (optlen < sizeof(int))
3650 if (get_user(val, (int __user *) optval))
3653 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3658 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3659 char __user *optval,
3660 unsigned int optlen)
3664 if (optlen < sizeof(int))
3666 if (get_user(val, (int __user *) optval))
3669 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3674 /* API 6.2 setsockopt(), getsockopt()
3676 * Applications use setsockopt() and getsockopt() to set or retrieve
3677 * socket options. Socket options are used to change the default
3678 * behavior of sockets calls. They are described in Section 7.
3682 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3683 * int __user *optlen);
3684 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3687 * sd - the socket descript.
3688 * level - set to IPPROTO_SCTP for all SCTP options.
3689 * optname - the option name.
3690 * optval - the buffer to store the value of the option.
3691 * optlen - the size of the buffer.
3693 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3694 char __user *optval, unsigned int optlen)
3698 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3700 /* I can hardly begin to describe how wrong this is. This is
3701 * so broken as to be worse than useless. The API draft
3702 * REALLY is NOT helpful here... I am not convinced that the
3703 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3704 * are at all well-founded.
3706 if (level != SOL_SCTP) {
3707 struct sctp_af *af = sctp_sk(sk)->pf->af;
3708 retval = af->setsockopt(sk, level, optname, optval, optlen);
3715 case SCTP_SOCKOPT_BINDX_ADD:
3716 /* 'optlen' is the size of the addresses buffer. */
3717 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3718 optlen, SCTP_BINDX_ADD_ADDR);
3721 case SCTP_SOCKOPT_BINDX_REM:
3722 /* 'optlen' is the size of the addresses buffer. */
3723 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3724 optlen, SCTP_BINDX_REM_ADDR);
3727 case SCTP_SOCKOPT_CONNECTX_OLD:
3728 /* 'optlen' is the size of the addresses buffer. */
3729 retval = sctp_setsockopt_connectx_old(sk,
3730 (struct sockaddr __user *)optval,
3734 case SCTP_SOCKOPT_CONNECTX:
3735 /* 'optlen' is the size of the addresses buffer. */
3736 retval = sctp_setsockopt_connectx(sk,
3737 (struct sockaddr __user *)optval,
3741 case SCTP_DISABLE_FRAGMENTS:
3742 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3746 retval = sctp_setsockopt_events(sk, optval, optlen);
3749 case SCTP_AUTOCLOSE:
3750 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3753 case SCTP_PEER_ADDR_PARAMS:
3754 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3757 case SCTP_DELAYED_SACK:
3758 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3760 case SCTP_PARTIAL_DELIVERY_POINT:
3761 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3765 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3767 case SCTP_DEFAULT_SEND_PARAM:
3768 retval = sctp_setsockopt_default_send_param(sk, optval,
3771 case SCTP_DEFAULT_SNDINFO:
3772 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3774 case SCTP_PRIMARY_ADDR:
3775 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3777 case SCTP_SET_PEER_PRIMARY_ADDR:
3778 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3781 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3784 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3786 case SCTP_ASSOCINFO:
3787 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3789 case SCTP_I_WANT_MAPPED_V4_ADDR:
3790 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3793 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3795 case SCTP_ADAPTATION_LAYER:
3796 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3799 retval = sctp_setsockopt_context(sk, optval, optlen);
3801 case SCTP_FRAGMENT_INTERLEAVE:
3802 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3804 case SCTP_MAX_BURST:
3805 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3807 case SCTP_AUTH_CHUNK:
3808 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3810 case SCTP_HMAC_IDENT:
3811 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3814 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3816 case SCTP_AUTH_ACTIVE_KEY:
3817 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3819 case SCTP_AUTH_DELETE_KEY:
3820 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3822 case SCTP_AUTO_ASCONF:
3823 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3825 case SCTP_PEER_ADDR_THLDS:
3826 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3828 case SCTP_RECVRCVINFO:
3829 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3831 case SCTP_RECVNXTINFO:
3832 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3835 retval = -ENOPROTOOPT;
3845 /* API 3.1.6 connect() - UDP Style Syntax
3847 * An application may use the connect() call in the UDP model to initiate an
3848 * association without sending data.
3852 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3854 * sd: the socket descriptor to have a new association added to.
3856 * nam: the address structure (either struct sockaddr_in or struct
3857 * sockaddr_in6 defined in RFC2553 [7]).
3859 * len: the size of the address.
3861 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3869 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3872 /* Validate addr_len before calling common connect/connectx routine. */
3873 af = sctp_get_af_specific(addr->sa_family);
3874 if (!af || addr_len < af->sockaddr_len) {
3877 /* Pass correct addr len to common routine (so it knows there
3878 * is only one address being passed.
3880 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3887 /* FIXME: Write comments. */
3888 static int sctp_disconnect(struct sock *sk, int flags)
3890 return -EOPNOTSUPP; /* STUB */
3893 /* 4.1.4 accept() - TCP Style Syntax
3895 * Applications use accept() call to remove an established SCTP
3896 * association from the accept queue of the endpoint. A new socket
3897 * descriptor will be returned from accept() to represent the newly
3898 * formed association.
3900 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3902 struct sctp_sock *sp;
3903 struct sctp_endpoint *ep;
3904 struct sock *newsk = NULL;
3905 struct sctp_association *asoc;
3914 if (!sctp_style(sk, TCP)) {
3915 error = -EOPNOTSUPP;
3919 if (!sctp_sstate(sk, LISTENING)) {
3924 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3926 error = sctp_wait_for_accept(sk, timeo);
3930 /* We treat the list of associations on the endpoint as the accept
3931 * queue and pick the first association on the list.
3933 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3935 newsk = sp->pf->create_accept_sk(sk, asoc);
3941 /* Populate the fields of the newsk from the oldsk and migrate the
3942 * asoc to the newsk.
3944 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3952 /* The SCTP ioctl handler. */
3953 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3960 * SEQPACKET-style sockets in LISTENING state are valid, for
3961 * SCTP, so only discard TCP-style sockets in LISTENING state.
3963 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3968 struct sk_buff *skb;
3969 unsigned int amount = 0;
3971 skb = skb_peek(&sk->sk_receive_queue);
3974 * We will only return the amount of this packet since
3975 * that is all that will be read.
3979 rc = put_user(amount, (int __user *)arg);
3991 /* This is the function which gets called during socket creation to
3992 * initialized the SCTP-specific portion of the sock.
3993 * The sock structure should already be zero-filled memory.
3995 static int sctp_init_sock(struct sock *sk)
3997 struct net *net = sock_net(sk);
3998 struct sctp_sock *sp;
4000 pr_debug("%s: sk:%p\n", __func__, sk);
4004 /* Initialize the SCTP per socket area. */
4005 switch (sk->sk_type) {
4006 case SOCK_SEQPACKET:
4007 sp->type = SCTP_SOCKET_UDP;
4010 sp->type = SCTP_SOCKET_TCP;
4013 return -ESOCKTNOSUPPORT;
4016 /* Initialize default send parameters. These parameters can be
4017 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4019 sp->default_stream = 0;
4020 sp->default_ppid = 0;
4021 sp->default_flags = 0;
4022 sp->default_context = 0;
4023 sp->default_timetolive = 0;
4025 sp->default_rcv_context = 0;
4026 sp->max_burst = net->sctp.max_burst;
4028 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4030 /* Initialize default setup parameters. These parameters
4031 * can be modified with the SCTP_INITMSG socket option or
4032 * overridden by the SCTP_INIT CMSG.
4034 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4035 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4036 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4037 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4039 /* Initialize default RTO related parameters. These parameters can
4040 * be modified for with the SCTP_RTOINFO socket option.
4042 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4043 sp->rtoinfo.srto_max = net->sctp.rto_max;
4044 sp->rtoinfo.srto_min = net->sctp.rto_min;
4046 /* Initialize default association related parameters. These parameters
4047 * can be modified with the SCTP_ASSOCINFO socket option.
4049 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4050 sp->assocparams.sasoc_number_peer_destinations = 0;
4051 sp->assocparams.sasoc_peer_rwnd = 0;
4052 sp->assocparams.sasoc_local_rwnd = 0;
4053 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4055 /* Initialize default event subscriptions. By default, all the
4058 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4060 /* Default Peer Address Parameters. These defaults can
4061 * be modified via SCTP_PEER_ADDR_PARAMS
4063 sp->hbinterval = net->sctp.hb_interval;
4064 sp->pathmaxrxt = net->sctp.max_retrans_path;
4065 sp->pathmtu = 0; /* allow default discovery */
4066 sp->sackdelay = net->sctp.sack_timeout;
4068 sp->param_flags = SPP_HB_ENABLE |
4070 SPP_SACKDELAY_ENABLE;
4072 /* If enabled no SCTP message fragmentation will be performed.
4073 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4075 sp->disable_fragments = 0;
4077 /* Enable Nagle algorithm by default. */
4080 sp->recvrcvinfo = 0;
4081 sp->recvnxtinfo = 0;
4083 /* Enable by default. */
4086 /* Auto-close idle associations after the configured
4087 * number of seconds. A value of 0 disables this
4088 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4089 * for UDP-style sockets only.
4093 /* User specified fragmentation limit. */
4096 sp->adaptation_ind = 0;
4098 sp->pf = sctp_get_pf_specific(sk->sk_family);
4100 /* Control variables for partial data delivery. */
4101 atomic_set(&sp->pd_mode, 0);
4102 skb_queue_head_init(&sp->pd_lobby);
4103 sp->frag_interleave = 0;
4105 /* Create a per socket endpoint structure. Even if we
4106 * change the data structure relationships, this may still
4107 * be useful for storing pre-connect address information.
4109 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4115 sk->sk_destruct = sctp_destruct_sock;
4117 SCTP_DBG_OBJCNT_INC(sock);
4120 percpu_counter_inc(&sctp_sockets_allocated);
4121 sock_prot_inuse_add(net, sk->sk_prot, 1);
4123 /* Nothing can fail after this block, otherwise
4124 * sctp_destroy_sock() will be called without addr_wq_lock held
4126 if (net->sctp.default_auto_asconf) {
4127 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4128 list_add_tail(&sp->auto_asconf_list,
4129 &net->sctp.auto_asconf_splist);
4130 sp->do_auto_asconf = 1;
4131 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4133 sp->do_auto_asconf = 0;
4141 /* Cleanup any SCTP per socket resources. Must be called with
4142 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4144 static void sctp_destroy_sock(struct sock *sk)
4146 struct sctp_sock *sp;
4148 pr_debug("%s: sk:%p\n", __func__, sk);
4150 /* Release our hold on the endpoint. */
4152 /* This could happen during socket init, thus we bail out
4153 * early, since the rest of the below is not setup either.
4158 if (sp->do_auto_asconf) {
4159 sp->do_auto_asconf = 0;
4160 list_del(&sp->auto_asconf_list);
4162 sctp_endpoint_free(sp->ep);
4164 percpu_counter_dec(&sctp_sockets_allocated);
4165 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4169 /* Triggered when there are no references on the socket anymore */
4170 static void sctp_destruct_sock(struct sock *sk)
4172 struct sctp_sock *sp = sctp_sk(sk);
4174 /* Free up the HMAC transform. */
4175 crypto_free_hash(sp->hmac);
4177 inet_sock_destruct(sk);
4180 /* API 4.1.7 shutdown() - TCP Style Syntax
4181 * int shutdown(int socket, int how);
4183 * sd - the socket descriptor of the association to be closed.
4184 * how - Specifies the type of shutdown. The values are
4187 * Disables further receive operations. No SCTP
4188 * protocol action is taken.
4190 * Disables further send operations, and initiates
4191 * the SCTP shutdown sequence.
4193 * Disables further send and receive operations
4194 * and initiates the SCTP shutdown sequence.
4196 static void sctp_shutdown(struct sock *sk, int how)
4198 struct net *net = sock_net(sk);
4199 struct sctp_endpoint *ep;
4200 struct sctp_association *asoc;
4202 if (!sctp_style(sk, TCP))
4205 if (how & SEND_SHUTDOWN) {
4206 ep = sctp_sk(sk)->ep;
4207 if (!list_empty(&ep->asocs)) {
4208 asoc = list_entry(ep->asocs.next,
4209 struct sctp_association, asocs);
4210 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4215 /* 7.2.1 Association Status (SCTP_STATUS)
4217 * Applications can retrieve current status information about an
4218 * association, including association state, peer receiver window size,
4219 * number of unacked data chunks, and number of data chunks pending
4220 * receipt. This information is read-only.
4222 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4223 char __user *optval,
4226 struct sctp_status status;
4227 struct sctp_association *asoc = NULL;
4228 struct sctp_transport *transport;
4229 sctp_assoc_t associd;
4232 if (len < sizeof(status)) {
4237 len = sizeof(status);
4238 if (copy_from_user(&status, optval, len)) {
4243 associd = status.sstat_assoc_id;
4244 asoc = sctp_id2assoc(sk, associd);
4250 transport = asoc->peer.primary_path;
4252 status.sstat_assoc_id = sctp_assoc2id(asoc);
4253 status.sstat_state = sctp_assoc_to_state(asoc);
4254 status.sstat_rwnd = asoc->peer.rwnd;
4255 status.sstat_unackdata = asoc->unack_data;
4257 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4258 status.sstat_instrms = asoc->c.sinit_max_instreams;
4259 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4260 status.sstat_fragmentation_point = asoc->frag_point;
4261 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4262 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4263 transport->af_specific->sockaddr_len);
4264 /* Map ipv4 address into v4-mapped-on-v6 address. */
4265 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4266 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4267 status.sstat_primary.spinfo_state = transport->state;
4268 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4269 status.sstat_primary.spinfo_srtt = transport->srtt;
4270 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4271 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4273 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4274 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4276 if (put_user(len, optlen)) {
4281 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4282 __func__, len, status.sstat_state, status.sstat_rwnd,
4283 status.sstat_assoc_id);
4285 if (copy_to_user(optval, &status, len)) {
4295 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4297 * Applications can retrieve information about a specific peer address
4298 * of an association, including its reachability state, congestion
4299 * window, and retransmission timer values. This information is
4302 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4303 char __user *optval,
4306 struct sctp_paddrinfo pinfo;
4307 struct sctp_transport *transport;
4310 if (len < sizeof(pinfo)) {
4315 len = sizeof(pinfo);
4316 if (copy_from_user(&pinfo, optval, len)) {
4321 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4322 pinfo.spinfo_assoc_id);
4326 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4327 pinfo.spinfo_state = transport->state;
4328 pinfo.spinfo_cwnd = transport->cwnd;
4329 pinfo.spinfo_srtt = transport->srtt;
4330 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4331 pinfo.spinfo_mtu = transport->pathmtu;
4333 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4334 pinfo.spinfo_state = SCTP_ACTIVE;
4336 if (put_user(len, optlen)) {
4341 if (copy_to_user(optval, &pinfo, len)) {
4350 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4352 * This option is a on/off flag. If enabled no SCTP message
4353 * fragmentation will be performed. Instead if a message being sent
4354 * exceeds the current PMTU size, the message will NOT be sent and
4355 * instead a error will be indicated to the user.
4357 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4358 char __user *optval, int __user *optlen)
4362 if (len < sizeof(int))
4366 val = (sctp_sk(sk)->disable_fragments == 1);
4367 if (put_user(len, optlen))
4369 if (copy_to_user(optval, &val, len))
4374 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4376 * This socket option is used to specify various notifications and
4377 * ancillary data the user wishes to receive.
4379 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4384 if (len > sizeof(struct sctp_event_subscribe))
4385 len = sizeof(struct sctp_event_subscribe);
4386 if (put_user(len, optlen))
4388 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4393 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4395 * This socket option is applicable to the UDP-style socket only. When
4396 * set it will cause associations that are idle for more than the
4397 * specified number of seconds to automatically close. An association
4398 * being idle is defined an association that has NOT sent or received
4399 * user data. The special value of '0' indicates that no automatic
4400 * close of any associations should be performed. The option expects an
4401 * integer defining the number of seconds of idle time before an
4402 * association is closed.
4404 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4406 /* Applicable to UDP-style socket only */
4407 if (sctp_style(sk, TCP))
4409 if (len < sizeof(int))
4412 if (put_user(len, optlen))
4414 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4419 /* Helper routine to branch off an association to a new socket. */
4420 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4422 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4423 struct sctp_sock *sp = sctp_sk(sk);
4424 struct socket *sock;
4430 /* An association cannot be branched off from an already peeled-off
4431 * socket, nor is this supported for tcp style sockets.
4433 if (!sctp_style(sk, UDP))
4436 /* Create a new socket. */
4437 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4441 sctp_copy_sock(sock->sk, sk, asoc);
4443 /* Make peeled-off sockets more like 1-1 accepted sockets.
4444 * Set the daddr and initialize id to something more random
4446 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4448 /* Populate the fields of the newsk from the oldsk and migrate the
4449 * asoc to the newsk.
4451 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4457 EXPORT_SYMBOL(sctp_do_peeloff);
4459 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4461 sctp_peeloff_arg_t peeloff;
4462 struct socket *newsock;
4463 struct file *newfile;
4466 if (len < sizeof(sctp_peeloff_arg_t))
4468 len = sizeof(sctp_peeloff_arg_t);
4469 if (copy_from_user(&peeloff, optval, len))
4472 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4476 /* Map the socket to an unused fd that can be returned to the user. */
4477 retval = get_unused_fd_flags(0);
4479 sock_release(newsock);
4483 newfile = sock_alloc_file(newsock, 0, NULL);
4484 if (unlikely(IS_ERR(newfile))) {
4485 put_unused_fd(retval);
4486 sock_release(newsock);
4487 return PTR_ERR(newfile);
4490 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4493 /* Return the fd mapped to the new socket. */
4494 if (put_user(len, optlen)) {
4496 put_unused_fd(retval);
4499 peeloff.sd = retval;
4500 if (copy_to_user(optval, &peeloff, len)) {
4502 put_unused_fd(retval);
4505 fd_install(retval, newfile);
4510 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4512 * Applications can enable or disable heartbeats for any peer address of
4513 * an association, modify an address's heartbeat interval, force a
4514 * heartbeat to be sent immediately, and adjust the address's maximum
4515 * number of retransmissions sent before an address is considered
4516 * unreachable. The following structure is used to access and modify an
4517 * address's parameters:
4519 * struct sctp_paddrparams {
4520 * sctp_assoc_t spp_assoc_id;
4521 * struct sockaddr_storage spp_address;
4522 * uint32_t spp_hbinterval;
4523 * uint16_t spp_pathmaxrxt;
4524 * uint32_t spp_pathmtu;
4525 * uint32_t spp_sackdelay;
4526 * uint32_t spp_flags;
4529 * spp_assoc_id - (one-to-many style socket) This is filled in the
4530 * application, and identifies the association for
4532 * spp_address - This specifies which address is of interest.
4533 * spp_hbinterval - This contains the value of the heartbeat interval,
4534 * in milliseconds. If a value of zero
4535 * is present in this field then no changes are to
4536 * be made to this parameter.
4537 * spp_pathmaxrxt - This contains the maximum number of
4538 * retransmissions before this address shall be
4539 * considered unreachable. If a value of zero
4540 * is present in this field then no changes are to
4541 * be made to this parameter.
4542 * spp_pathmtu - When Path MTU discovery is disabled the value
4543 * specified here will be the "fixed" path mtu.
4544 * Note that if the spp_address field is empty
4545 * then all associations on this address will
4546 * have this fixed path mtu set upon them.
4548 * spp_sackdelay - When delayed sack is enabled, this value specifies
4549 * the number of milliseconds that sacks will be delayed
4550 * for. This value will apply to all addresses of an
4551 * association if the spp_address field is empty. Note
4552 * also, that if delayed sack is enabled and this
4553 * value is set to 0, no change is made to the last
4554 * recorded delayed sack timer value.
4556 * spp_flags - These flags are used to control various features
4557 * on an association. The flag field may contain
4558 * zero or more of the following options.
4560 * SPP_HB_ENABLE - Enable heartbeats on the
4561 * specified address. Note that if the address
4562 * field is empty all addresses for the association
4563 * have heartbeats enabled upon them.
4565 * SPP_HB_DISABLE - Disable heartbeats on the
4566 * speicifed address. Note that if the address
4567 * field is empty all addresses for the association
4568 * will have their heartbeats disabled. Note also
4569 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4570 * mutually exclusive, only one of these two should
4571 * be specified. Enabling both fields will have
4572 * undetermined results.
4574 * SPP_HB_DEMAND - Request a user initiated heartbeat
4575 * to be made immediately.
4577 * SPP_PMTUD_ENABLE - This field will enable PMTU
4578 * discovery upon the specified address. Note that
4579 * if the address feild is empty then all addresses
4580 * on the association are effected.
4582 * SPP_PMTUD_DISABLE - This field will disable PMTU
4583 * discovery upon the specified address. Note that
4584 * if the address feild is empty then all addresses
4585 * on the association are effected. Not also that
4586 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4587 * exclusive. Enabling both will have undetermined
4590 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4591 * on delayed sack. The time specified in spp_sackdelay
4592 * is used to specify the sack delay for this address. Note
4593 * that if spp_address is empty then all addresses will
4594 * enable delayed sack and take on the sack delay
4595 * value specified in spp_sackdelay.
4596 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4597 * off delayed sack. If the spp_address field is blank then
4598 * delayed sack is disabled for the entire association. Note
4599 * also that this field is mutually exclusive to
4600 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4603 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4604 char __user *optval, int __user *optlen)
4606 struct sctp_paddrparams params;
4607 struct sctp_transport *trans = NULL;
4608 struct sctp_association *asoc = NULL;
4609 struct sctp_sock *sp = sctp_sk(sk);
4611 if (len < sizeof(struct sctp_paddrparams))
4613 len = sizeof(struct sctp_paddrparams);
4614 if (copy_from_user(¶ms, optval, len))
4617 /* If an address other than INADDR_ANY is specified, and
4618 * no transport is found, then the request is invalid.
4620 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4621 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4622 params.spp_assoc_id);
4624 pr_debug("%s: failed no transport\n", __func__);
4629 /* Get association, if assoc_id != 0 and the socket is a one
4630 * to many style socket, and an association was not found, then
4631 * the id was invalid.
4633 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4634 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4635 pr_debug("%s: failed no association\n", __func__);
4640 /* Fetch transport values. */
4641 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4642 params.spp_pathmtu = trans->pathmtu;
4643 params.spp_pathmaxrxt = trans->pathmaxrxt;
4644 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4646 /*draft-11 doesn't say what to return in spp_flags*/
4647 params.spp_flags = trans->param_flags;
4649 /* Fetch association values. */
4650 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4651 params.spp_pathmtu = asoc->pathmtu;
4652 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4653 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4655 /*draft-11 doesn't say what to return in spp_flags*/
4656 params.spp_flags = asoc->param_flags;
4658 /* Fetch socket values. */
4659 params.spp_hbinterval = sp->hbinterval;
4660 params.spp_pathmtu = sp->pathmtu;
4661 params.spp_sackdelay = sp->sackdelay;
4662 params.spp_pathmaxrxt = sp->pathmaxrxt;
4664 /*draft-11 doesn't say what to return in spp_flags*/
4665 params.spp_flags = sp->param_flags;
4668 if (copy_to_user(optval, ¶ms, len))
4671 if (put_user(len, optlen))
4678 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4680 * This option will effect the way delayed acks are performed. This
4681 * option allows you to get or set the delayed ack time, in
4682 * milliseconds. It also allows changing the delayed ack frequency.
4683 * Changing the frequency to 1 disables the delayed sack algorithm. If
4684 * the assoc_id is 0, then this sets or gets the endpoints default
4685 * values. If the assoc_id field is non-zero, then the set or get
4686 * effects the specified association for the one to many model (the
4687 * assoc_id field is ignored by the one to one model). Note that if
4688 * sack_delay or sack_freq are 0 when setting this option, then the
4689 * current values will remain unchanged.
4691 * struct sctp_sack_info {
4692 * sctp_assoc_t sack_assoc_id;
4693 * uint32_t sack_delay;
4694 * uint32_t sack_freq;
4697 * sack_assoc_id - This parameter, indicates which association the user
4698 * is performing an action upon. Note that if this field's value is
4699 * zero then the endpoints default value is changed (effecting future
4700 * associations only).
4702 * sack_delay - This parameter contains the number of milliseconds that
4703 * the user is requesting the delayed ACK timer be set to. Note that
4704 * this value is defined in the standard to be between 200 and 500
4707 * sack_freq - This parameter contains the number of packets that must
4708 * be received before a sack is sent without waiting for the delay
4709 * timer to expire. The default value for this is 2, setting this
4710 * value to 1 will disable the delayed sack algorithm.
4712 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4713 char __user *optval,
4716 struct sctp_sack_info params;
4717 struct sctp_association *asoc = NULL;
4718 struct sctp_sock *sp = sctp_sk(sk);
4720 if (len >= sizeof(struct sctp_sack_info)) {
4721 len = sizeof(struct sctp_sack_info);
4723 if (copy_from_user(¶ms, optval, len))
4725 } else if (len == sizeof(struct sctp_assoc_value)) {
4726 pr_warn_ratelimited(DEPRECATED
4728 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4729 "Use struct sctp_sack_info instead\n",
4730 current->comm, task_pid_nr(current));
4731 if (copy_from_user(¶ms, optval, len))
4736 /* Get association, if sack_assoc_id != 0 and the socket is a one
4737 * to many style socket, and an association was not found, then
4738 * the id was invalid.
4740 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4741 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4745 /* Fetch association values. */
4746 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4747 params.sack_delay = jiffies_to_msecs(
4749 params.sack_freq = asoc->sackfreq;
4752 params.sack_delay = 0;
4753 params.sack_freq = 1;
4756 /* Fetch socket values. */
4757 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4758 params.sack_delay = sp->sackdelay;
4759 params.sack_freq = sp->sackfreq;
4761 params.sack_delay = 0;
4762 params.sack_freq = 1;
4766 if (copy_to_user(optval, ¶ms, len))
4769 if (put_user(len, optlen))
4775 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4777 * Applications can specify protocol parameters for the default association
4778 * initialization. The option name argument to setsockopt() and getsockopt()
4781 * Setting initialization parameters is effective only on an unconnected
4782 * socket (for UDP-style sockets only future associations are effected
4783 * by the change). With TCP-style sockets, this option is inherited by
4784 * sockets derived from a listener socket.
4786 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4788 if (len < sizeof(struct sctp_initmsg))
4790 len = sizeof(struct sctp_initmsg);
4791 if (put_user(len, optlen))
4793 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4799 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4800 char __user *optval, int __user *optlen)
4802 struct sctp_association *asoc;
4804 struct sctp_getaddrs getaddrs;
4805 struct sctp_transport *from;
4807 union sctp_addr temp;
4808 struct sctp_sock *sp = sctp_sk(sk);
4813 if (len < sizeof(struct sctp_getaddrs))
4816 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4819 /* For UDP-style sockets, id specifies the association to query. */
4820 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4824 to = optval + offsetof(struct sctp_getaddrs, addrs);
4825 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4827 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4829 memcpy(&temp, &from->ipaddr, sizeof(temp));
4830 addrlen = sctp_get_pf_specific(sk->sk_family)
4831 ->addr_to_user(sp, &temp);
4832 if (space_left < addrlen)
4834 if (copy_to_user(to, &temp, addrlen))
4838 space_left -= addrlen;
4841 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4843 bytes_copied = ((char __user *)to) - optval;
4844 if (put_user(bytes_copied, optlen))
4850 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4851 size_t space_left, int *bytes_copied)
4853 struct sctp_sockaddr_entry *addr;
4854 union sctp_addr temp;
4857 struct net *net = sock_net(sk);
4860 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4864 if ((PF_INET == sk->sk_family) &&
4865 (AF_INET6 == addr->a.sa.sa_family))
4867 if ((PF_INET6 == sk->sk_family) &&
4868 inet_v6_ipv6only(sk) &&
4869 (AF_INET == addr->a.sa.sa_family))
4871 memcpy(&temp, &addr->a, sizeof(temp));
4872 if (!temp.v4.sin_port)
4873 temp.v4.sin_port = htons(port);
4875 addrlen = sctp_get_pf_specific(sk->sk_family)
4876 ->addr_to_user(sctp_sk(sk), &temp);
4878 if (space_left < addrlen) {
4882 memcpy(to, &temp, addrlen);
4886 space_left -= addrlen;
4887 *bytes_copied += addrlen;
4895 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4896 char __user *optval, int __user *optlen)
4898 struct sctp_bind_addr *bp;
4899 struct sctp_association *asoc;
4901 struct sctp_getaddrs getaddrs;
4902 struct sctp_sockaddr_entry *addr;
4904 union sctp_addr temp;
4905 struct sctp_sock *sp = sctp_sk(sk);
4909 int bytes_copied = 0;
4913 if (len < sizeof(struct sctp_getaddrs))
4916 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4920 * For UDP-style sockets, id specifies the association to query.
4921 * If the id field is set to the value '0' then the locally bound
4922 * addresses are returned without regard to any particular
4925 if (0 == getaddrs.assoc_id) {
4926 bp = &sctp_sk(sk)->ep->base.bind_addr;
4928 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4931 bp = &asoc->base.bind_addr;
4934 to = optval + offsetof(struct sctp_getaddrs, addrs);
4935 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4937 addrs = kmalloc(space_left, GFP_KERNEL);
4941 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4942 * addresses from the global local address list.
4944 if (sctp_list_single_entry(&bp->address_list)) {
4945 addr = list_entry(bp->address_list.next,
4946 struct sctp_sockaddr_entry, list);
4947 if (sctp_is_any(sk, &addr->a)) {
4948 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4949 space_left, &bytes_copied);
4959 /* Protection on the bound address list is not needed since
4960 * in the socket option context we hold a socket lock and
4961 * thus the bound address list can't change.
4963 list_for_each_entry(addr, &bp->address_list, list) {
4964 memcpy(&temp, &addr->a, sizeof(temp));
4965 addrlen = sctp_get_pf_specific(sk->sk_family)
4966 ->addr_to_user(sp, &temp);
4967 if (space_left < addrlen) {
4968 err = -ENOMEM; /*fixme: right error?*/
4971 memcpy(buf, &temp, addrlen);
4973 bytes_copied += addrlen;
4975 space_left -= addrlen;
4979 if (copy_to_user(to, addrs, bytes_copied)) {
4983 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4987 if (put_user(bytes_copied, optlen))
4994 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4996 * Requests that the local SCTP stack use the enclosed peer address as
4997 * the association primary. The enclosed address must be one of the
4998 * association peer's addresses.
5000 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5001 char __user *optval, int __user *optlen)
5003 struct sctp_prim prim;
5004 struct sctp_association *asoc;
5005 struct sctp_sock *sp = sctp_sk(sk);
5007 if (len < sizeof(struct sctp_prim))
5010 len = sizeof(struct sctp_prim);
5012 if (copy_from_user(&prim, optval, len))
5015 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5019 if (!asoc->peer.primary_path)
5022 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5023 asoc->peer.primary_path->af_specific->sockaddr_len);
5025 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5026 (union sctp_addr *)&prim.ssp_addr);
5028 if (put_user(len, optlen))
5030 if (copy_to_user(optval, &prim, len))
5037 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5039 * Requests that the local endpoint set the specified Adaptation Layer
5040 * Indication parameter for all future INIT and INIT-ACK exchanges.
5042 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5043 char __user *optval, int __user *optlen)
5045 struct sctp_setadaptation adaptation;
5047 if (len < sizeof(struct sctp_setadaptation))
5050 len = sizeof(struct sctp_setadaptation);
5052 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5054 if (put_user(len, optlen))
5056 if (copy_to_user(optval, &adaptation, len))
5064 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5066 * Applications that wish to use the sendto() system call may wish to
5067 * specify a default set of parameters that would normally be supplied
5068 * through the inclusion of ancillary data. This socket option allows
5069 * such an application to set the default sctp_sndrcvinfo structure.
5072 * The application that wishes to use this socket option simply passes
5073 * in to this call the sctp_sndrcvinfo structure defined in Section
5074 * 5.2.2) The input parameters accepted by this call include
5075 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5076 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5077 * to this call if the caller is using the UDP model.
5079 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5081 static int sctp_getsockopt_default_send_param(struct sock *sk,
5082 int len, char __user *optval,
5085 struct sctp_sock *sp = sctp_sk(sk);
5086 struct sctp_association *asoc;
5087 struct sctp_sndrcvinfo info;
5089 if (len < sizeof(info))
5094 if (copy_from_user(&info, optval, len))
5097 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5098 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5101 info.sinfo_stream = asoc->default_stream;
5102 info.sinfo_flags = asoc->default_flags;
5103 info.sinfo_ppid = asoc->default_ppid;
5104 info.sinfo_context = asoc->default_context;
5105 info.sinfo_timetolive = asoc->default_timetolive;
5107 info.sinfo_stream = sp->default_stream;
5108 info.sinfo_flags = sp->default_flags;
5109 info.sinfo_ppid = sp->default_ppid;
5110 info.sinfo_context = sp->default_context;
5111 info.sinfo_timetolive = sp->default_timetolive;
5114 if (put_user(len, optlen))
5116 if (copy_to_user(optval, &info, len))
5122 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5123 * (SCTP_DEFAULT_SNDINFO)
5125 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5126 char __user *optval,
5129 struct sctp_sock *sp = sctp_sk(sk);
5130 struct sctp_association *asoc;
5131 struct sctp_sndinfo info;
5133 if (len < sizeof(info))
5138 if (copy_from_user(&info, optval, len))
5141 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5142 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5145 info.snd_sid = asoc->default_stream;
5146 info.snd_flags = asoc->default_flags;
5147 info.snd_ppid = asoc->default_ppid;
5148 info.snd_context = asoc->default_context;
5150 info.snd_sid = sp->default_stream;
5151 info.snd_flags = sp->default_flags;
5152 info.snd_ppid = sp->default_ppid;
5153 info.snd_context = sp->default_context;
5156 if (put_user(len, optlen))
5158 if (copy_to_user(optval, &info, len))
5166 * 7.1.5 SCTP_NODELAY
5168 * Turn on/off any Nagle-like algorithm. This means that packets are
5169 * generally sent as soon as possible and no unnecessary delays are
5170 * introduced, at the cost of more packets in the network. Expects an
5171 * integer boolean flag.
5174 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5175 char __user *optval, int __user *optlen)
5179 if (len < sizeof(int))
5183 val = (sctp_sk(sk)->nodelay == 1);
5184 if (put_user(len, optlen))
5186 if (copy_to_user(optval, &val, len))
5193 * 7.1.1 SCTP_RTOINFO
5195 * The protocol parameters used to initialize and bound retransmission
5196 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5197 * and modify these parameters.
5198 * All parameters are time values, in milliseconds. A value of 0, when
5199 * modifying the parameters, indicates that the current value should not
5203 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5204 char __user *optval,
5205 int __user *optlen) {
5206 struct sctp_rtoinfo rtoinfo;
5207 struct sctp_association *asoc;
5209 if (len < sizeof (struct sctp_rtoinfo))
5212 len = sizeof(struct sctp_rtoinfo);
5214 if (copy_from_user(&rtoinfo, optval, len))
5217 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5219 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5222 /* Values corresponding to the specific association. */
5224 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5225 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5226 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5228 /* Values corresponding to the endpoint. */
5229 struct sctp_sock *sp = sctp_sk(sk);
5231 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5232 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5233 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5236 if (put_user(len, optlen))
5239 if (copy_to_user(optval, &rtoinfo, len))
5247 * 7.1.2 SCTP_ASSOCINFO
5249 * This option is used to tune the maximum retransmission attempts
5250 * of the association.
5251 * Returns an error if the new association retransmission value is
5252 * greater than the sum of the retransmission value of the peer.
5253 * See [SCTP] for more information.
5256 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5257 char __user *optval,
5261 struct sctp_assocparams assocparams;
5262 struct sctp_association *asoc;
5263 struct list_head *pos;
5266 if (len < sizeof (struct sctp_assocparams))
5269 len = sizeof(struct sctp_assocparams);
5271 if (copy_from_user(&assocparams, optval, len))
5274 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5276 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5279 /* Values correspoinding to the specific association */
5281 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5282 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5283 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5284 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5286 list_for_each(pos, &asoc->peer.transport_addr_list) {
5290 assocparams.sasoc_number_peer_destinations = cnt;
5292 /* Values corresponding to the endpoint */
5293 struct sctp_sock *sp = sctp_sk(sk);
5295 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5296 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5297 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5298 assocparams.sasoc_cookie_life =
5299 sp->assocparams.sasoc_cookie_life;
5300 assocparams.sasoc_number_peer_destinations =
5302 sasoc_number_peer_destinations;
5305 if (put_user(len, optlen))
5308 if (copy_to_user(optval, &assocparams, len))
5315 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5317 * This socket option is a boolean flag which turns on or off mapped V4
5318 * addresses. If this option is turned on and the socket is type
5319 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5320 * If this option is turned off, then no mapping will be done of V4
5321 * addresses and a user will receive both PF_INET6 and PF_INET type
5322 * addresses on the socket.
5324 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5325 char __user *optval, int __user *optlen)
5328 struct sctp_sock *sp = sctp_sk(sk);
5330 if (len < sizeof(int))
5335 if (put_user(len, optlen))
5337 if (copy_to_user(optval, &val, len))
5344 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5345 * (chapter and verse is quoted at sctp_setsockopt_context())
5347 static int sctp_getsockopt_context(struct sock *sk, int len,
5348 char __user *optval, int __user *optlen)
5350 struct sctp_assoc_value params;
5351 struct sctp_sock *sp;
5352 struct sctp_association *asoc;
5354 if (len < sizeof(struct sctp_assoc_value))
5357 len = sizeof(struct sctp_assoc_value);
5359 if (copy_from_user(¶ms, optval, len))
5364 if (params.assoc_id != 0) {
5365 asoc = sctp_id2assoc(sk, params.assoc_id);
5368 params.assoc_value = asoc->default_rcv_context;
5370 params.assoc_value = sp->default_rcv_context;
5373 if (put_user(len, optlen))
5375 if (copy_to_user(optval, ¶ms, len))
5382 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5383 * This option will get or set the maximum size to put in any outgoing
5384 * SCTP DATA chunk. If a message is larger than this size it will be
5385 * fragmented by SCTP into the specified size. Note that the underlying
5386 * SCTP implementation may fragment into smaller sized chunks when the
5387 * PMTU of the underlying association is smaller than the value set by
5388 * the user. The default value for this option is '0' which indicates
5389 * the user is NOT limiting fragmentation and only the PMTU will effect
5390 * SCTP's choice of DATA chunk size. Note also that values set larger
5391 * than the maximum size of an IP datagram will effectively let SCTP
5392 * control fragmentation (i.e. the same as setting this option to 0).
5394 * The following structure is used to access and modify this parameter:
5396 * struct sctp_assoc_value {
5397 * sctp_assoc_t assoc_id;
5398 * uint32_t assoc_value;
5401 * assoc_id: This parameter is ignored for one-to-one style sockets.
5402 * For one-to-many style sockets this parameter indicates which
5403 * association the user is performing an action upon. Note that if
5404 * this field's value is zero then the endpoints default value is
5405 * changed (effecting future associations only).
5406 * assoc_value: This parameter specifies the maximum size in bytes.
5408 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5409 char __user *optval, int __user *optlen)
5411 struct sctp_assoc_value params;
5412 struct sctp_association *asoc;
5414 if (len == sizeof(int)) {
5415 pr_warn_ratelimited(DEPRECATED
5417 "Use of int in maxseg socket option.\n"
5418 "Use struct sctp_assoc_value instead\n",
5419 current->comm, task_pid_nr(current));
5420 params.assoc_id = 0;
5421 } else if (len >= sizeof(struct sctp_assoc_value)) {
5422 len = sizeof(struct sctp_assoc_value);
5423 if (copy_from_user(¶ms, optval, sizeof(params)))
5428 asoc = sctp_id2assoc(sk, params.assoc_id);
5429 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5433 params.assoc_value = asoc->frag_point;
5435 params.assoc_value = sctp_sk(sk)->user_frag;
5437 if (put_user(len, optlen))
5439 if (len == sizeof(int)) {
5440 if (copy_to_user(optval, ¶ms.assoc_value, len))
5443 if (copy_to_user(optval, ¶ms, len))
5451 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5452 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5454 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5455 char __user *optval, int __user *optlen)
5459 if (len < sizeof(int))
5464 val = sctp_sk(sk)->frag_interleave;
5465 if (put_user(len, optlen))
5467 if (copy_to_user(optval, &val, len))
5474 * 7.1.25. Set or Get the sctp partial delivery point
5475 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5477 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5478 char __user *optval,
5483 if (len < sizeof(u32))
5488 val = sctp_sk(sk)->pd_point;
5489 if (put_user(len, optlen))
5491 if (copy_to_user(optval, &val, len))
5498 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5499 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5501 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5502 char __user *optval,
5505 struct sctp_assoc_value params;
5506 struct sctp_sock *sp;
5507 struct sctp_association *asoc;
5509 if (len == sizeof(int)) {
5510 pr_warn_ratelimited(DEPRECATED
5512 "Use of int in max_burst socket option.\n"
5513 "Use struct sctp_assoc_value instead\n",
5514 current->comm, task_pid_nr(current));
5515 params.assoc_id = 0;
5516 } else if (len >= sizeof(struct sctp_assoc_value)) {
5517 len = sizeof(struct sctp_assoc_value);
5518 if (copy_from_user(¶ms, optval, len))
5525 if (params.assoc_id != 0) {
5526 asoc = sctp_id2assoc(sk, params.assoc_id);
5529 params.assoc_value = asoc->max_burst;
5531 params.assoc_value = sp->max_burst;
5533 if (len == sizeof(int)) {
5534 if (copy_to_user(optval, ¶ms.assoc_value, len))
5537 if (copy_to_user(optval, ¶ms, len))
5545 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5546 char __user *optval, int __user *optlen)
5548 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5549 struct sctp_hmacalgo __user *p = (void __user *)optval;
5550 struct sctp_hmac_algo_param *hmacs;
5554 if (!ep->auth_enable)
5557 hmacs = ep->auth_hmacs_list;
5558 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5560 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5563 len = sizeof(struct sctp_hmacalgo) + data_len;
5564 num_idents = data_len / sizeof(u16);
5566 if (put_user(len, optlen))
5568 if (put_user(num_idents, &p->shmac_num_idents))
5570 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5575 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5576 char __user *optval, int __user *optlen)
5578 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5579 struct sctp_authkeyid val;
5580 struct sctp_association *asoc;
5582 if (!ep->auth_enable)
5585 if (len < sizeof(struct sctp_authkeyid))
5587 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5590 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5591 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5595 val.scact_keynumber = asoc->active_key_id;
5597 val.scact_keynumber = ep->active_key_id;
5599 len = sizeof(struct sctp_authkeyid);
5600 if (put_user(len, optlen))
5602 if (copy_to_user(optval, &val, len))
5608 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5609 char __user *optval, int __user *optlen)
5611 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5612 struct sctp_authchunks __user *p = (void __user *)optval;
5613 struct sctp_authchunks val;
5614 struct sctp_association *asoc;
5615 struct sctp_chunks_param *ch;
5619 if (!ep->auth_enable)
5622 if (len < sizeof(struct sctp_authchunks))
5625 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5628 to = p->gauth_chunks;
5629 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5633 ch = asoc->peer.peer_chunks;
5637 /* See if the user provided enough room for all the data */
5638 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5639 if (len < num_chunks)
5642 if (copy_to_user(to, ch->chunks, num_chunks))
5645 len = sizeof(struct sctp_authchunks) + num_chunks;
5646 if (put_user(len, optlen))
5648 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5653 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5654 char __user *optval, int __user *optlen)
5656 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5657 struct sctp_authchunks __user *p = (void __user *)optval;
5658 struct sctp_authchunks val;
5659 struct sctp_association *asoc;
5660 struct sctp_chunks_param *ch;
5664 if (!ep->auth_enable)
5667 if (len < sizeof(struct sctp_authchunks))
5670 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5673 to = p->gauth_chunks;
5674 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5675 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5679 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5681 ch = ep->auth_chunk_list;
5686 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5687 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5690 if (copy_to_user(to, ch->chunks, num_chunks))
5693 len = sizeof(struct sctp_authchunks) + num_chunks;
5694 if (put_user(len, optlen))
5696 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5703 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5704 * This option gets the current number of associations that are attached
5705 * to a one-to-many style socket. The option value is an uint32_t.
5707 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5708 char __user *optval, int __user *optlen)
5710 struct sctp_sock *sp = sctp_sk(sk);
5711 struct sctp_association *asoc;
5714 if (sctp_style(sk, TCP))
5717 if (len < sizeof(u32))
5722 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5726 if (put_user(len, optlen))
5728 if (copy_to_user(optval, &val, len))
5735 * 8.1.23 SCTP_AUTO_ASCONF
5736 * See the corresponding setsockopt entry as description
5738 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5739 char __user *optval, int __user *optlen)
5743 if (len < sizeof(int))
5747 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5749 if (put_user(len, optlen))
5751 if (copy_to_user(optval, &val, len))
5757 * 8.2.6. Get the Current Identifiers of Associations
5758 * (SCTP_GET_ASSOC_ID_LIST)
5760 * This option gets the current list of SCTP association identifiers of
5761 * the SCTP associations handled by a one-to-many style socket.
5763 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5764 char __user *optval, int __user *optlen)
5766 struct sctp_sock *sp = sctp_sk(sk);
5767 struct sctp_association *asoc;
5768 struct sctp_assoc_ids *ids;
5771 if (sctp_style(sk, TCP))
5774 if (len < sizeof(struct sctp_assoc_ids))
5777 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5781 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5784 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5786 ids = kmalloc(len, GFP_KERNEL);
5790 ids->gaids_number_of_ids = num;
5792 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5793 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5796 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5806 * SCTP_PEER_ADDR_THLDS
5808 * This option allows us to fetch the partially failed threshold for one or all
5809 * transports in an association. See Section 6.1 of:
5810 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5812 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5813 char __user *optval,
5817 struct sctp_paddrthlds val;
5818 struct sctp_transport *trans;
5819 struct sctp_association *asoc;
5821 if (len < sizeof(struct sctp_paddrthlds))
5823 len = sizeof(struct sctp_paddrthlds);
5824 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5827 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5828 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5832 val.spt_pathpfthld = asoc->pf_retrans;
5833 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5835 trans = sctp_addr_id2transport(sk, &val.spt_address,
5840 val.spt_pathmaxrxt = trans->pathmaxrxt;
5841 val.spt_pathpfthld = trans->pf_retrans;
5844 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5851 * SCTP_GET_ASSOC_STATS
5853 * This option retrieves local per endpoint statistics. It is modeled
5854 * after OpenSolaris' implementation
5856 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5857 char __user *optval,
5860 struct sctp_assoc_stats sas;
5861 struct sctp_association *asoc = NULL;
5863 /* User must provide at least the assoc id */
5864 if (len < sizeof(sctp_assoc_t))
5867 /* Allow the struct to grow and fill in as much as possible */
5868 len = min_t(size_t, len, sizeof(sas));
5870 if (copy_from_user(&sas, optval, len))
5873 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5877 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5878 sas.sas_gapcnt = asoc->stats.gapcnt;
5879 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5880 sas.sas_osacks = asoc->stats.osacks;
5881 sas.sas_isacks = asoc->stats.isacks;
5882 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5883 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5884 sas.sas_oodchunks = asoc->stats.oodchunks;
5885 sas.sas_iodchunks = asoc->stats.iodchunks;
5886 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5887 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5888 sas.sas_idupchunks = asoc->stats.idupchunks;
5889 sas.sas_opackets = asoc->stats.opackets;
5890 sas.sas_ipackets = asoc->stats.ipackets;
5892 /* New high max rto observed, will return 0 if not a single
5893 * RTO update took place. obs_rto_ipaddr will be bogus
5896 sas.sas_maxrto = asoc->stats.max_obs_rto;
5897 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5898 sizeof(struct sockaddr_storage));
5900 /* Mark beginning of a new observation period */
5901 asoc->stats.max_obs_rto = asoc->rto_min;
5903 if (put_user(len, optlen))
5906 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5908 if (copy_to_user(optval, &sas, len))
5914 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5915 char __user *optval,
5920 if (len < sizeof(int))
5924 if (sctp_sk(sk)->recvrcvinfo)
5926 if (put_user(len, optlen))
5928 if (copy_to_user(optval, &val, len))
5934 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5935 char __user *optval,
5940 if (len < sizeof(int))
5944 if (sctp_sk(sk)->recvnxtinfo)
5946 if (put_user(len, optlen))
5948 if (copy_to_user(optval, &val, len))
5954 static int sctp_getsockopt(struct sock *sk, int level, int optname,
5955 char __user *optval, int __user *optlen)
5960 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
5962 /* I can hardly begin to describe how wrong this is. This is
5963 * so broken as to be worse than useless. The API draft
5964 * REALLY is NOT helpful here... I am not convinced that the
5965 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5966 * are at all well-founded.
5968 if (level != SOL_SCTP) {
5969 struct sctp_af *af = sctp_sk(sk)->pf->af;
5971 retval = af->getsockopt(sk, level, optname, optval, optlen);
5975 if (get_user(len, optlen))
5982 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5984 case SCTP_DISABLE_FRAGMENTS:
5985 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5989 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5991 case SCTP_AUTOCLOSE:
5992 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5994 case SCTP_SOCKOPT_PEELOFF:
5995 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5997 case SCTP_PEER_ADDR_PARAMS:
5998 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6001 case SCTP_DELAYED_SACK:
6002 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6006 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6008 case SCTP_GET_PEER_ADDRS:
6009 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6012 case SCTP_GET_LOCAL_ADDRS:
6013 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6016 case SCTP_SOCKOPT_CONNECTX3:
6017 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6019 case SCTP_DEFAULT_SEND_PARAM:
6020 retval = sctp_getsockopt_default_send_param(sk, len,
6023 case SCTP_DEFAULT_SNDINFO:
6024 retval = sctp_getsockopt_default_sndinfo(sk, len,
6027 case SCTP_PRIMARY_ADDR:
6028 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6031 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6034 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6036 case SCTP_ASSOCINFO:
6037 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6039 case SCTP_I_WANT_MAPPED_V4_ADDR:
6040 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6043 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6045 case SCTP_GET_PEER_ADDR_INFO:
6046 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6049 case SCTP_ADAPTATION_LAYER:
6050 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6054 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6056 case SCTP_FRAGMENT_INTERLEAVE:
6057 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6060 case SCTP_PARTIAL_DELIVERY_POINT:
6061 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6064 case SCTP_MAX_BURST:
6065 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6068 case SCTP_AUTH_CHUNK:
6069 case SCTP_AUTH_DELETE_KEY:
6070 retval = -EOPNOTSUPP;
6072 case SCTP_HMAC_IDENT:
6073 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6075 case SCTP_AUTH_ACTIVE_KEY:
6076 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6078 case SCTP_PEER_AUTH_CHUNKS:
6079 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6082 case SCTP_LOCAL_AUTH_CHUNKS:
6083 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6086 case SCTP_GET_ASSOC_NUMBER:
6087 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6089 case SCTP_GET_ASSOC_ID_LIST:
6090 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6092 case SCTP_AUTO_ASCONF:
6093 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6095 case SCTP_PEER_ADDR_THLDS:
6096 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6098 case SCTP_GET_ASSOC_STATS:
6099 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6101 case SCTP_RECVRCVINFO:
6102 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6104 case SCTP_RECVNXTINFO:
6105 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6108 retval = -ENOPROTOOPT;
6116 static void sctp_hash(struct sock *sk)
6121 static void sctp_unhash(struct sock *sk)
6126 /* Check if port is acceptable. Possibly find first available port.
6128 * The port hash table (contained in the 'global' SCTP protocol storage
6129 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6130 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6131 * list (the list number is the port number hashed out, so as you
6132 * would expect from a hash function, all the ports in a given list have
6133 * such a number that hashes out to the same list number; you were
6134 * expecting that, right?); so each list has a set of ports, with a
6135 * link to the socket (struct sock) that uses it, the port number and
6136 * a fastreuse flag (FIXME: NPI ipg).
6138 static struct sctp_bind_bucket *sctp_bucket_create(
6139 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6141 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6143 struct sctp_bind_hashbucket *head; /* hash list */
6144 struct sctp_bind_bucket *pp;
6145 unsigned short snum;
6148 snum = ntohs(addr->v4.sin_port);
6150 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6155 /* Search for an available port. */
6156 int low, high, remaining, index;
6158 struct net *net = sock_net(sk);
6160 inet_get_local_port_range(net, &low, &high);
6161 remaining = (high - low) + 1;
6162 rover = prandom_u32() % remaining + low;
6166 if ((rover < low) || (rover > high))
6168 if (inet_is_local_reserved_port(net, rover))
6170 index = sctp_phashfn(sock_net(sk), rover);
6171 head = &sctp_port_hashtable[index];
6172 spin_lock(&head->lock);
6173 sctp_for_each_hentry(pp, &head->chain)
6174 if ((pp->port == rover) &&
6175 net_eq(sock_net(sk), pp->net))
6179 spin_unlock(&head->lock);
6180 } while (--remaining > 0);
6182 /* Exhausted local port range during search? */
6187 /* OK, here is the one we will use. HEAD (the port
6188 * hash table list entry) is non-NULL and we hold it's
6193 /* We are given an specific port number; we verify
6194 * that it is not being used. If it is used, we will
6195 * exahust the search in the hash list corresponding
6196 * to the port number (snum) - we detect that with the
6197 * port iterator, pp being NULL.
6199 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6200 spin_lock(&head->lock);
6201 sctp_for_each_hentry(pp, &head->chain) {
6202 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6209 if (!hlist_empty(&pp->owner)) {
6210 /* We had a port hash table hit - there is an
6211 * available port (pp != NULL) and it is being
6212 * used by other socket (pp->owner not empty); that other
6213 * socket is going to be sk2.
6215 int reuse = sk->sk_reuse;
6218 pr_debug("%s: found a possible match\n", __func__);
6220 if (pp->fastreuse && sk->sk_reuse &&
6221 sk->sk_state != SCTP_SS_LISTENING)
6224 /* Run through the list of sockets bound to the port
6225 * (pp->port) [via the pointers bind_next and
6226 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6227 * we get the endpoint they describe and run through
6228 * the endpoint's list of IP (v4 or v6) addresses,
6229 * comparing each of the addresses with the address of
6230 * the socket sk. If we find a match, then that means
6231 * that this port/socket (sk) combination are already
6234 sk_for_each_bound(sk2, &pp->owner) {
6235 struct sctp_endpoint *ep2;
6236 ep2 = sctp_sk(sk2)->ep;
6239 (reuse && sk2->sk_reuse &&
6240 sk2->sk_state != SCTP_SS_LISTENING))
6243 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6244 sctp_sk(sk2), sctp_sk(sk))) {
6250 pr_debug("%s: found a match\n", __func__);
6253 /* If there was a hash table miss, create a new port. */
6255 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6258 /* In either case (hit or miss), make sure fastreuse is 1 only
6259 * if sk->sk_reuse is too (that is, if the caller requested
6260 * SO_REUSEADDR on this socket -sk-).
6262 if (hlist_empty(&pp->owner)) {
6263 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6267 } else if (pp->fastreuse &&
6268 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6271 /* We are set, so fill up all the data in the hash table
6272 * entry, tie the socket list information with the rest of the
6273 * sockets FIXME: Blurry, NPI (ipg).
6276 if (!sctp_sk(sk)->bind_hash) {
6277 inet_sk(sk)->inet_num = snum;
6278 sk_add_bind_node(sk, &pp->owner);
6279 sctp_sk(sk)->bind_hash = pp;
6284 spin_unlock(&head->lock);
6291 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6292 * port is requested.
6294 static int sctp_get_port(struct sock *sk, unsigned short snum)
6296 union sctp_addr addr;
6297 struct sctp_af *af = sctp_sk(sk)->pf->af;
6299 /* Set up a dummy address struct from the sk. */
6300 af->from_sk(&addr, sk);
6301 addr.v4.sin_port = htons(snum);
6303 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6304 return !!sctp_get_port_local(sk, &addr);
6308 * Move a socket to LISTENING state.
6310 static int sctp_listen_start(struct sock *sk, int backlog)
6312 struct sctp_sock *sp = sctp_sk(sk);
6313 struct sctp_endpoint *ep = sp->ep;
6314 struct crypto_hash *tfm = NULL;
6317 /* Allocate HMAC for generating cookie. */
6318 if (!sp->hmac && sp->sctp_hmac_alg) {
6319 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6320 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6322 net_info_ratelimited("failed to load transform for %s: %ld\n",
6323 sp->sctp_hmac_alg, PTR_ERR(tfm));
6326 sctp_sk(sk)->hmac = tfm;
6330 * If a bind() or sctp_bindx() is not called prior to a listen()
6331 * call that allows new associations to be accepted, the system
6332 * picks an ephemeral port and will choose an address set equivalent
6333 * to binding with a wildcard address.
6335 * This is not currently spelled out in the SCTP sockets
6336 * extensions draft, but follows the practice as seen in TCP
6340 sk->sk_state = SCTP_SS_LISTENING;
6341 if (!ep->base.bind_addr.port) {
6342 if (sctp_autobind(sk))
6345 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6346 sk->sk_state = SCTP_SS_CLOSED;
6351 sk->sk_max_ack_backlog = backlog;
6352 sctp_hash_endpoint(ep);
6357 * 4.1.3 / 5.1.3 listen()
6359 * By default, new associations are not accepted for UDP style sockets.
6360 * An application uses listen() to mark a socket as being able to
6361 * accept new associations.
6363 * On TCP style sockets, applications use listen() to ready the SCTP
6364 * endpoint for accepting inbound associations.
6366 * On both types of endpoints a backlog of '0' disables listening.
6368 * Move a socket to LISTENING state.
6370 int sctp_inet_listen(struct socket *sock, int backlog)
6372 struct sock *sk = sock->sk;
6373 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6376 if (unlikely(backlog < 0))
6381 /* Peeled-off sockets are not allowed to listen(). */
6382 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6385 if (sock->state != SS_UNCONNECTED)
6388 /* If backlog is zero, disable listening. */
6390 if (sctp_sstate(sk, CLOSED))
6394 sctp_unhash_endpoint(ep);
6395 sk->sk_state = SCTP_SS_CLOSED;
6397 sctp_sk(sk)->bind_hash->fastreuse = 1;
6401 /* If we are already listening, just update the backlog */
6402 if (sctp_sstate(sk, LISTENING))
6403 sk->sk_max_ack_backlog = backlog;
6405 err = sctp_listen_start(sk, backlog);
6417 * This function is done by modeling the current datagram_poll() and the
6418 * tcp_poll(). Note that, based on these implementations, we don't
6419 * lock the socket in this function, even though it seems that,
6420 * ideally, locking or some other mechanisms can be used to ensure
6421 * the integrity of the counters (sndbuf and wmem_alloc) used
6422 * in this place. We assume that we don't need locks either until proven
6425 * Another thing to note is that we include the Async I/O support
6426 * here, again, by modeling the current TCP/UDP code. We don't have
6427 * a good way to test with it yet.
6429 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6431 struct sock *sk = sock->sk;
6432 struct sctp_sock *sp = sctp_sk(sk);
6435 poll_wait(file, sk_sleep(sk), wait);
6437 /* A TCP-style listening socket becomes readable when the accept queue
6440 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6441 return (!list_empty(&sp->ep->asocs)) ?
6442 (POLLIN | POLLRDNORM) : 0;
6446 /* Is there any exceptional events? */
6447 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6449 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6450 if (sk->sk_shutdown & RCV_SHUTDOWN)
6451 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6452 if (sk->sk_shutdown == SHUTDOWN_MASK)
6455 /* Is it readable? Reconsider this code with TCP-style support. */
6456 if (!skb_queue_empty(&sk->sk_receive_queue))
6457 mask |= POLLIN | POLLRDNORM;
6459 /* The association is either gone or not ready. */
6460 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6463 /* Is it writable? */
6464 if (sctp_writeable(sk)) {
6465 mask |= POLLOUT | POLLWRNORM;
6467 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6469 * Since the socket is not locked, the buffer
6470 * might be made available after the writeable check and
6471 * before the bit is set. This could cause a lost I/O
6472 * signal. tcp_poll() has a race breaker for this race
6473 * condition. Based on their implementation, we put
6474 * in the following code to cover it as well.
6476 if (sctp_writeable(sk))
6477 mask |= POLLOUT | POLLWRNORM;
6482 /********************************************************************
6483 * 2nd Level Abstractions
6484 ********************************************************************/
6486 static struct sctp_bind_bucket *sctp_bucket_create(
6487 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6489 struct sctp_bind_bucket *pp;
6491 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6493 SCTP_DBG_OBJCNT_INC(bind_bucket);
6496 INIT_HLIST_HEAD(&pp->owner);
6498 hlist_add_head(&pp->node, &head->chain);
6503 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6504 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6506 if (pp && hlist_empty(&pp->owner)) {
6507 __hlist_del(&pp->node);
6508 kmem_cache_free(sctp_bucket_cachep, pp);
6509 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6513 /* Release this socket's reference to a local port. */
6514 static inline void __sctp_put_port(struct sock *sk)
6516 struct sctp_bind_hashbucket *head =
6517 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6518 inet_sk(sk)->inet_num)];
6519 struct sctp_bind_bucket *pp;
6521 spin_lock(&head->lock);
6522 pp = sctp_sk(sk)->bind_hash;
6523 __sk_del_bind_node(sk);
6524 sctp_sk(sk)->bind_hash = NULL;
6525 inet_sk(sk)->inet_num = 0;
6526 sctp_bucket_destroy(pp);
6527 spin_unlock(&head->lock);
6530 void sctp_put_port(struct sock *sk)
6533 __sctp_put_port(sk);
6538 * The system picks an ephemeral port and choose an address set equivalent
6539 * to binding with a wildcard address.
6540 * One of those addresses will be the primary address for the association.
6541 * This automatically enables the multihoming capability of SCTP.
6543 static int sctp_autobind(struct sock *sk)
6545 union sctp_addr autoaddr;
6549 /* Initialize a local sockaddr structure to INADDR_ANY. */
6550 af = sctp_sk(sk)->pf->af;
6552 port = htons(inet_sk(sk)->inet_num);
6553 af->inaddr_any(&autoaddr, port);
6555 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6558 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6561 * 4.2 The cmsghdr Structure *
6563 * When ancillary data is sent or received, any number of ancillary data
6564 * objects can be specified by the msg_control and msg_controllen members of
6565 * the msghdr structure, because each object is preceded by
6566 * a cmsghdr structure defining the object's length (the cmsg_len member).
6567 * Historically Berkeley-derived implementations have passed only one object
6568 * at a time, but this API allows multiple objects to be
6569 * passed in a single call to sendmsg() or recvmsg(). The following example
6570 * shows two ancillary data objects in a control buffer.
6572 * |<--------------------------- msg_controllen -------------------------->|
6575 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6577 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6580 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6582 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6585 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6586 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6588 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6590 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6597 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6599 struct cmsghdr *cmsg;
6600 struct msghdr *my_msg = (struct msghdr *)msg;
6602 for_each_cmsghdr(cmsg, my_msg) {
6603 if (!CMSG_OK(my_msg, cmsg))
6606 /* Should we parse this header or ignore? */
6607 if (cmsg->cmsg_level != IPPROTO_SCTP)
6610 /* Strictly check lengths following example in SCM code. */
6611 switch (cmsg->cmsg_type) {
6613 /* SCTP Socket API Extension
6614 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6616 * This cmsghdr structure provides information for
6617 * initializing new SCTP associations with sendmsg().
6618 * The SCTP_INITMSG socket option uses this same data
6619 * structure. This structure is not used for
6622 * cmsg_level cmsg_type cmsg_data[]
6623 * ------------ ------------ ----------------------
6624 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6626 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6629 cmsgs->init = CMSG_DATA(cmsg);
6633 /* SCTP Socket API Extension
6634 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6636 * This cmsghdr structure specifies SCTP options for
6637 * sendmsg() and describes SCTP header information
6638 * about a received message through recvmsg().
6640 * cmsg_level cmsg_type cmsg_data[]
6641 * ------------ ------------ ----------------------
6642 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6644 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6647 cmsgs->srinfo = CMSG_DATA(cmsg);
6649 if (cmsgs->srinfo->sinfo_flags &
6650 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6651 SCTP_ABORT | SCTP_EOF))
6656 /* SCTP Socket API Extension
6657 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6659 * This cmsghdr structure specifies SCTP options for
6660 * sendmsg(). This structure and SCTP_RCVINFO replaces
6661 * SCTP_SNDRCV which has been deprecated.
6663 * cmsg_level cmsg_type cmsg_data[]
6664 * ------------ ------------ ---------------------
6665 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6667 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6670 cmsgs->sinfo = CMSG_DATA(cmsg);
6672 if (cmsgs->sinfo->snd_flags &
6673 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6674 SCTP_ABORT | SCTP_EOF))
6686 * Wait for a packet..
6687 * Note: This function is the same function as in core/datagram.c
6688 * with a few modifications to make lksctp work.
6690 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6695 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6697 /* Socket errors? */
6698 error = sock_error(sk);
6702 if (!skb_queue_empty(&sk->sk_receive_queue))
6705 /* Socket shut down? */
6706 if (sk->sk_shutdown & RCV_SHUTDOWN)
6709 /* Sequenced packets can come disconnected. If so we report the
6714 /* Is there a good reason to think that we may receive some data? */
6715 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6718 /* Handle signals. */
6719 if (signal_pending(current))
6722 /* Let another process have a go. Since we are going to sleep
6723 * anyway. Note: This may cause odd behaviors if the message
6724 * does not fit in the user's buffer, but this seems to be the
6725 * only way to honor MSG_DONTWAIT realistically.
6728 *timeo_p = schedule_timeout(*timeo_p);
6732 finish_wait(sk_sleep(sk), &wait);
6736 error = sock_intr_errno(*timeo_p);
6739 finish_wait(sk_sleep(sk), &wait);
6744 /* Receive a datagram.
6745 * Note: This is pretty much the same routine as in core/datagram.c
6746 * with a few changes to make lksctp work.
6748 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6749 int noblock, int *err)
6752 struct sk_buff *skb;
6755 timeo = sock_rcvtimeo(sk, noblock);
6757 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6758 MAX_SCHEDULE_TIMEOUT);
6761 /* Again only user level code calls this function,
6762 * so nothing interrupt level
6763 * will suddenly eat the receive_queue.
6765 * Look at current nfs client by the way...
6766 * However, this function was correct in any case. 8)
6768 if (flags & MSG_PEEK) {
6769 spin_lock_bh(&sk->sk_receive_queue.lock);
6770 skb = skb_peek(&sk->sk_receive_queue);
6772 atomic_inc(&skb->users);
6773 spin_unlock_bh(&sk->sk_receive_queue.lock);
6775 skb = skb_dequeue(&sk->sk_receive_queue);
6781 /* Caller is allowed not to check sk->sk_err before calling. */
6782 error = sock_error(sk);
6786 if (sk->sk_shutdown & RCV_SHUTDOWN)
6789 if (sk_can_busy_loop(sk) &&
6790 sk_busy_loop(sk, noblock))
6793 /* User doesn't want to wait. */
6797 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6806 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6807 static void __sctp_write_space(struct sctp_association *asoc)
6809 struct sock *sk = asoc->base.sk;
6810 struct socket *sock = sk->sk_socket;
6812 if ((sctp_wspace(asoc) > 0) && sock) {
6813 if (waitqueue_active(&asoc->wait))
6814 wake_up_interruptible(&asoc->wait);
6816 if (sctp_writeable(sk)) {
6817 wait_queue_head_t *wq = sk_sleep(sk);
6819 if (wq && waitqueue_active(wq))
6820 wake_up_interruptible(wq);
6822 /* Note that we try to include the Async I/O support
6823 * here by modeling from the current TCP/UDP code.
6824 * We have not tested with it yet.
6826 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6827 sock_wake_async(sock,
6828 SOCK_WAKE_SPACE, POLL_OUT);
6833 static void sctp_wake_up_waiters(struct sock *sk,
6834 struct sctp_association *asoc)
6836 struct sctp_association *tmp = asoc;
6838 /* We do accounting for the sndbuf space per association,
6839 * so we only need to wake our own association.
6841 if (asoc->ep->sndbuf_policy)
6842 return __sctp_write_space(asoc);
6844 /* If association goes down and is just flushing its
6845 * outq, then just normally notify others.
6847 if (asoc->base.dead)
6848 return sctp_write_space(sk);
6850 /* Accounting for the sndbuf space is per socket, so we
6851 * need to wake up others, try to be fair and in case of
6852 * other associations, let them have a go first instead
6853 * of just doing a sctp_write_space() call.
6855 * Note that we reach sctp_wake_up_waiters() only when
6856 * associations free up queued chunks, thus we are under
6857 * lock and the list of associations on a socket is
6858 * guaranteed not to change.
6860 for (tmp = list_next_entry(tmp, asocs); 1;
6861 tmp = list_next_entry(tmp, asocs)) {
6862 /* Manually skip the head element. */
6863 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6865 /* Wake up association. */
6866 __sctp_write_space(tmp);
6867 /* We've reached the end. */
6873 /* Do accounting for the sndbuf space.
6874 * Decrement the used sndbuf space of the corresponding association by the
6875 * data size which was just transmitted(freed).
6877 static void sctp_wfree(struct sk_buff *skb)
6879 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
6880 struct sctp_association *asoc = chunk->asoc;
6881 struct sock *sk = asoc->base.sk;
6883 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6884 sizeof(struct sk_buff) +
6885 sizeof(struct sctp_chunk);
6887 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6890 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6892 sk->sk_wmem_queued -= skb->truesize;
6893 sk_mem_uncharge(sk, skb->truesize);
6896 sctp_wake_up_waiters(sk, asoc);
6898 sctp_association_put(asoc);
6901 /* Do accounting for the receive space on the socket.
6902 * Accounting for the association is done in ulpevent.c
6903 * We set this as a destructor for the cloned data skbs so that
6904 * accounting is done at the correct time.
6906 void sctp_sock_rfree(struct sk_buff *skb)
6908 struct sock *sk = skb->sk;
6909 struct sctp_ulpevent *event = sctp_skb2event(skb);
6911 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6914 * Mimic the behavior of sock_rfree
6916 sk_mem_uncharge(sk, event->rmem_len);
6920 /* Helper function to wait for space in the sndbuf. */
6921 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6924 struct sock *sk = asoc->base.sk;
6926 long current_timeo = *timeo_p;
6929 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6932 /* Increment the association's refcnt. */
6933 sctp_association_hold(asoc);
6935 /* Wait on the association specific sndbuf space. */
6937 prepare_to_wait_exclusive(&asoc->wait, &wait,
6938 TASK_INTERRUPTIBLE);
6941 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6944 if (signal_pending(current))
6945 goto do_interrupted;
6946 if (msg_len <= sctp_wspace(asoc))
6949 /* Let another process have a go. Since we are going
6953 current_timeo = schedule_timeout(current_timeo);
6954 BUG_ON(sk != asoc->base.sk);
6957 *timeo_p = current_timeo;
6961 finish_wait(&asoc->wait, &wait);
6963 /* Release the association's refcnt. */
6964 sctp_association_put(asoc);
6973 err = sock_intr_errno(*timeo_p);
6981 void sctp_data_ready(struct sock *sk)
6983 struct socket_wq *wq;
6986 wq = rcu_dereference(sk->sk_wq);
6987 if (wq_has_sleeper(wq))
6988 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6989 POLLRDNORM | POLLRDBAND);
6990 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6994 /* If socket sndbuf has changed, wake up all per association waiters. */
6995 void sctp_write_space(struct sock *sk)
6997 struct sctp_association *asoc;
6999 /* Wake up the tasks in each wait queue. */
7000 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7001 __sctp_write_space(asoc);
7005 /* Is there any sndbuf space available on the socket?
7007 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7008 * associations on the same socket. For a UDP-style socket with
7009 * multiple associations, it is possible for it to be "unwriteable"
7010 * prematurely. I assume that this is acceptable because
7011 * a premature "unwriteable" is better than an accidental "writeable" which
7012 * would cause an unwanted block under certain circumstances. For the 1-1
7013 * UDP-style sockets or TCP-style sockets, this code should work.
7016 static int sctp_writeable(struct sock *sk)
7020 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7026 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7027 * returns immediately with EINPROGRESS.
7029 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7031 struct sock *sk = asoc->base.sk;
7033 long current_timeo = *timeo_p;
7036 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7038 /* Increment the association's refcnt. */
7039 sctp_association_hold(asoc);
7042 prepare_to_wait_exclusive(&asoc->wait, &wait,
7043 TASK_INTERRUPTIBLE);
7046 if (sk->sk_shutdown & RCV_SHUTDOWN)
7048 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7051 if (signal_pending(current))
7052 goto do_interrupted;
7054 if (sctp_state(asoc, ESTABLISHED))
7057 /* Let another process have a go. Since we are going
7061 current_timeo = schedule_timeout(current_timeo);
7064 *timeo_p = current_timeo;
7068 finish_wait(&asoc->wait, &wait);
7070 /* Release the association's refcnt. */
7071 sctp_association_put(asoc);
7076 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7079 err = -ECONNREFUSED;
7083 err = sock_intr_errno(*timeo_p);
7091 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7093 struct sctp_endpoint *ep;
7097 ep = sctp_sk(sk)->ep;
7101 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
7102 TASK_INTERRUPTIBLE);
7104 if (list_empty(&ep->asocs)) {
7106 timeo = schedule_timeout(timeo);
7111 if (!sctp_sstate(sk, LISTENING))
7115 if (!list_empty(&ep->asocs))
7118 err = sock_intr_errno(timeo);
7119 if (signal_pending(current))
7127 finish_wait(sk_sleep(sk), &wait);
7132 static void sctp_wait_for_close(struct sock *sk, long timeout)
7137 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7138 if (list_empty(&sctp_sk(sk)->ep->asocs))
7141 timeout = schedule_timeout(timeout);
7143 } while (!signal_pending(current) && timeout);
7145 finish_wait(sk_sleep(sk), &wait);
7148 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7150 struct sk_buff *frag;
7155 /* Don't forget the fragments. */
7156 skb_walk_frags(skb, frag)
7157 sctp_skb_set_owner_r_frag(frag, sk);
7160 sctp_skb_set_owner_r(skb, sk);
7163 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7164 struct sctp_association *asoc)
7166 struct inet_sock *inet = inet_sk(sk);
7167 struct inet_sock *newinet;
7169 newsk->sk_type = sk->sk_type;
7170 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7171 newsk->sk_flags = sk->sk_flags;
7172 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7173 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7174 newsk->sk_reuse = sk->sk_reuse;
7176 newsk->sk_shutdown = sk->sk_shutdown;
7177 newsk->sk_destruct = sctp_destruct_sock;
7178 newsk->sk_family = sk->sk_family;
7179 newsk->sk_protocol = IPPROTO_SCTP;
7180 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7181 newsk->sk_sndbuf = sk->sk_sndbuf;
7182 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7183 newsk->sk_lingertime = sk->sk_lingertime;
7184 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7185 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7187 newinet = inet_sk(newsk);
7189 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7190 * getsockname() and getpeername()
7192 newinet->inet_sport = inet->inet_sport;
7193 newinet->inet_saddr = inet->inet_saddr;
7194 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7195 newinet->inet_dport = htons(asoc->peer.port);
7196 newinet->pmtudisc = inet->pmtudisc;
7197 newinet->inet_id = asoc->next_tsn ^ jiffies;
7199 newinet->uc_ttl = inet->uc_ttl;
7200 newinet->mc_loop = 1;
7201 newinet->mc_ttl = 1;
7202 newinet->mc_index = 0;
7203 newinet->mc_list = NULL;
7206 static inline void sctp_copy_descendant(struct sock *sk_to,
7207 const struct sock *sk_from)
7209 int ancestor_size = sizeof(struct inet_sock) +
7210 sizeof(struct sctp_sock) -
7211 offsetof(struct sctp_sock, auto_asconf_list);
7213 if (sk_from->sk_family == PF_INET6)
7214 ancestor_size += sizeof(struct ipv6_pinfo);
7216 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7219 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7220 * and its messages to the newsk.
7222 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7223 struct sctp_association *assoc,
7224 sctp_socket_type_t type)
7226 struct sctp_sock *oldsp = sctp_sk(oldsk);
7227 struct sctp_sock *newsp = sctp_sk(newsk);
7228 struct sctp_bind_bucket *pp; /* hash list port iterator */
7229 struct sctp_endpoint *newep = newsp->ep;
7230 struct sk_buff *skb, *tmp;
7231 struct sctp_ulpevent *event;
7232 struct sctp_bind_hashbucket *head;
7234 /* Migrate socket buffer sizes and all the socket level options to the
7237 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7238 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7239 /* Brute force copy old sctp opt. */
7240 sctp_copy_descendant(newsk, oldsk);
7242 /* Restore the ep value that was overwritten with the above structure
7248 /* Hook this new socket in to the bind_hash list. */
7249 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7250 inet_sk(oldsk)->inet_num)];
7252 spin_lock(&head->lock);
7253 pp = sctp_sk(oldsk)->bind_hash;
7254 sk_add_bind_node(newsk, &pp->owner);
7255 sctp_sk(newsk)->bind_hash = pp;
7256 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7257 spin_unlock(&head->lock);
7260 /* Copy the bind_addr list from the original endpoint to the new
7261 * endpoint so that we can handle restarts properly
7263 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7264 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7266 /* Move any messages in the old socket's receive queue that are for the
7267 * peeled off association to the new socket's receive queue.
7269 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7270 event = sctp_skb2event(skb);
7271 if (event->asoc == assoc) {
7272 __skb_unlink(skb, &oldsk->sk_receive_queue);
7273 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7274 sctp_skb_set_owner_r_frag(skb, newsk);
7278 /* Clean up any messages pending delivery due to partial
7279 * delivery. Three cases:
7280 * 1) No partial deliver; no work.
7281 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7282 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7284 skb_queue_head_init(&newsp->pd_lobby);
7285 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7287 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7288 struct sk_buff_head *queue;
7290 /* Decide which queue to move pd_lobby skbs to. */
7291 if (assoc->ulpq.pd_mode) {
7292 queue = &newsp->pd_lobby;
7294 queue = &newsk->sk_receive_queue;
7296 /* Walk through the pd_lobby, looking for skbs that
7297 * need moved to the new socket.
7299 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7300 event = sctp_skb2event(skb);
7301 if (event->asoc == assoc) {
7302 __skb_unlink(skb, &oldsp->pd_lobby);
7303 __skb_queue_tail(queue, skb);
7304 sctp_skb_set_owner_r_frag(skb, newsk);
7308 /* Clear up any skbs waiting for the partial
7309 * delivery to finish.
7311 if (assoc->ulpq.pd_mode)
7312 sctp_clear_pd(oldsk, NULL);
7316 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7317 sctp_skb_set_owner_r_frag(skb, newsk);
7319 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7320 sctp_skb_set_owner_r_frag(skb, newsk);
7322 /* Set the type of socket to indicate that it is peeled off from the
7323 * original UDP-style socket or created with the accept() call on a
7324 * TCP-style socket..
7328 /* Mark the new socket "in-use" by the user so that any packets
7329 * that may arrive on the association after we've moved it are
7330 * queued to the backlog. This prevents a potential race between
7331 * backlog processing on the old socket and new-packet processing
7332 * on the new socket.
7334 * The caller has just allocated newsk so we can guarantee that other
7335 * paths won't try to lock it and then oldsk.
7337 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7338 sctp_assoc_migrate(assoc, newsk);
7340 /* If the association on the newsk is already closed before accept()
7341 * is called, set RCV_SHUTDOWN flag.
7343 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7344 newsk->sk_shutdown |= RCV_SHUTDOWN;
7346 newsk->sk_state = SCTP_SS_ESTABLISHED;
7347 release_sock(newsk);
7351 /* This proto struct describes the ULP interface for SCTP. */
7352 struct proto sctp_prot = {
7354 .owner = THIS_MODULE,
7355 .close = sctp_close,
7356 .connect = sctp_connect,
7357 .disconnect = sctp_disconnect,
7358 .accept = sctp_accept,
7359 .ioctl = sctp_ioctl,
7360 .init = sctp_init_sock,
7361 .destroy = sctp_destroy_sock,
7362 .shutdown = sctp_shutdown,
7363 .setsockopt = sctp_setsockopt,
7364 .getsockopt = sctp_getsockopt,
7365 .sendmsg = sctp_sendmsg,
7366 .recvmsg = sctp_recvmsg,
7368 .backlog_rcv = sctp_backlog_rcv,
7370 .unhash = sctp_unhash,
7371 .get_port = sctp_get_port,
7372 .obj_size = sizeof(struct sctp_sock),
7373 .sysctl_mem = sysctl_sctp_mem,
7374 .sysctl_rmem = sysctl_sctp_rmem,
7375 .sysctl_wmem = sysctl_sctp_wmem,
7376 .memory_pressure = &sctp_memory_pressure,
7377 .enter_memory_pressure = sctp_enter_memory_pressure,
7378 .memory_allocated = &sctp_memory_allocated,
7379 .sockets_allocated = &sctp_sockets_allocated,
7382 #if IS_ENABLED(CONFIG_IPV6)
7384 struct proto sctpv6_prot = {
7386 .owner = THIS_MODULE,
7387 .close = sctp_close,
7388 .connect = sctp_connect,
7389 .disconnect = sctp_disconnect,
7390 .accept = sctp_accept,
7391 .ioctl = sctp_ioctl,
7392 .init = sctp_init_sock,
7393 .destroy = sctp_destroy_sock,
7394 .shutdown = sctp_shutdown,
7395 .setsockopt = sctp_setsockopt,
7396 .getsockopt = sctp_getsockopt,
7397 .sendmsg = sctp_sendmsg,
7398 .recvmsg = sctp_recvmsg,
7400 .backlog_rcv = sctp_backlog_rcv,
7402 .unhash = sctp_unhash,
7403 .get_port = sctp_get_port,
7404 .obj_size = sizeof(struct sctp6_sock),
7405 .sysctl_mem = sysctl_sctp_mem,
7406 .sysctl_rmem = sysctl_sctp_rmem,
7407 .sysctl_wmem = sysctl_sctp_wmem,
7408 .memory_pressure = &sctp_memory_pressure,
7409 .enter_memory_pressure = sctp_enter_memory_pressure,
7410 .memory_allocated = &sctp_memory_allocated,
7411 .sockets_allocated = &sctp_sockets_allocated,
7413 #endif /* IS_ENABLED(CONFIG_IPV6) */