1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
57 #include <linux/wait.h>
58 #include <linux/time.h>
60 #include <linux/capability.h>
61 #include <linux/fcntl.h>
62 #include <linux/poll.h>
63 #include <linux/init.h>
64 #include <linux/crypto.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
67 #include <linux/compat.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
74 #include <net/busy_poll.h>
76 #include <linux/socket.h> /* for sa_family_t */
77 #include <linux/export.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* Forward declarations for internal helper functions. */
83 static int sctp_writeable(struct sock *sk);
84 static void sctp_wfree(struct sk_buff *skb);
85 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
87 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
88 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
89 static int sctp_wait_for_accept(struct sock *sk, long timeo);
90 static void sctp_wait_for_close(struct sock *sk, long timeo);
91 static void sctp_destruct_sock(struct sock *sk);
92 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
93 union sctp_addr *addr, int len);
94 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
95 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
96 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
97 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf(struct sctp_association *asoc,
99 struct sctp_chunk *chunk);
100 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
101 static int sctp_autobind(struct sock *sk);
102 static void sctp_sock_migrate(struct sock *, struct sock *,
103 struct sctp_association *, sctp_socket_type_t);
105 static int sctp_memory_pressure;
106 static atomic_long_t sctp_memory_allocated;
107 struct percpu_counter sctp_sockets_allocated;
109 static void sctp_enter_memory_pressure(struct sock *sk)
111 sctp_memory_pressure = 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association *asoc)
120 if (asoc->ep->sndbuf_policy)
121 amt = asoc->sndbuf_used;
123 amt = sk_wmem_alloc_get(asoc->base.sk);
125 if (amt >= asoc->base.sk->sk_sndbuf) {
126 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
129 amt = sk_stream_wspace(asoc->base.sk);
134 amt = asoc->base.sk->sk_sndbuf - amt;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
150 struct sctp_association *asoc = chunk->asoc;
151 struct sock *sk = asoc->base.sk;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc);
156 skb_set_owner_w(chunk->skb, sk);
158 chunk->skb->destructor = sctp_wfree;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk->skb)->destructor_arg = chunk;
162 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
163 sizeof(struct sk_buff) +
164 sizeof(struct sctp_chunk);
166 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
167 sk->sk_wmem_queued += chunk->skb->truesize;
168 sk_mem_charge(sk, chunk->skb->truesize);
171 /* Verify that this is a valid address. */
172 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
177 /* Verify basic sockaddr. */
178 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
182 /* Is this a valid SCTP address? */
183 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
186 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
192 /* Look up the association by its id. If this is not a UDP-style
193 * socket, the ID field is always ignored.
195 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
197 struct sctp_association *asoc = NULL;
199 /* If this is not a UDP-style socket, assoc id should be ignored. */
200 if (!sctp_style(sk, UDP)) {
201 /* Return NULL if the socket state is not ESTABLISHED. It
202 * could be a TCP-style listening socket or a socket which
203 * hasn't yet called connect() to establish an association.
205 if (!sctp_sstate(sk, ESTABLISHED))
208 /* Get the first and the only association from the list. */
209 if (!list_empty(&sctp_sk(sk)->ep->asocs))
210 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
211 struct sctp_association, asocs);
215 /* Otherwise this is a UDP-style socket. */
216 if (!id || (id == (sctp_assoc_t)-1))
219 spin_lock_bh(&sctp_assocs_id_lock);
220 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
221 spin_unlock_bh(&sctp_assocs_id_lock);
223 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
229 /* Look up the transport from an address and an assoc id. If both address and
230 * id are specified, the associations matching the address and the id should be
233 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
234 struct sockaddr_storage *addr,
237 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
238 struct sctp_transport *transport;
239 union sctp_addr *laddr = (union sctp_addr *)addr;
241 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
248 id_asoc = sctp_id2assoc(sk, id);
249 if (id_asoc && (id_asoc != addr_asoc))
252 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
253 (union sctp_addr *)addr);
258 /* API 3.1.2 bind() - UDP Style Syntax
259 * The syntax of bind() is,
261 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
263 * sd - the socket descriptor returned by socket().
264 * addr - the address structure (struct sockaddr_in or struct
265 * sockaddr_in6 [RFC 2553]),
266 * addr_len - the size of the address structure.
268 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
274 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
277 /* Disallow binding twice. */
278 if (!sctp_sk(sk)->ep->base.bind_addr.port)
279 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
289 static long sctp_get_port_local(struct sock *, union sctp_addr *);
291 /* Verify this is a valid sockaddr. */
292 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
293 union sctp_addr *addr, int len)
297 /* Check minimum size. */
298 if (len < sizeof (struct sockaddr))
301 /* V4 mapped address are really of AF_INET family */
302 if (addr->sa.sa_family == AF_INET6 &&
303 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
304 if (!opt->pf->af_supported(AF_INET, opt))
307 /* Does this PF support this AF? */
308 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
312 /* If we get this far, af is valid. */
313 af = sctp_get_af_specific(addr->sa.sa_family);
315 if (len < af->sockaddr_len)
321 /* Bind a local address either to an endpoint or to an association. */
322 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
324 struct net *net = sock_net(sk);
325 struct sctp_sock *sp = sctp_sk(sk);
326 struct sctp_endpoint *ep = sp->ep;
327 struct sctp_bind_addr *bp = &ep->base.bind_addr;
332 /* Common sockaddr verification. */
333 af = sctp_sockaddr_af(sp, addr, len);
335 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
336 __func__, sk, addr, len);
340 snum = ntohs(addr->v4.sin_port);
342 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
343 __func__, sk, &addr->sa, bp->port, snum, len);
345 /* PF specific bind() address verification. */
346 if (!sp->pf->bind_verify(sp, addr))
347 return -EADDRNOTAVAIL;
349 /* We must either be unbound, or bind to the same port.
350 * It's OK to allow 0 ports if we are already bound.
351 * We'll just inhert an already bound port in this case
356 else if (snum != bp->port) {
357 pr_debug("%s: new port %d doesn't match existing port "
358 "%d\n", __func__, snum, bp->port);
363 if (snum && snum < PROT_SOCK &&
364 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
367 /* See if the address matches any of the addresses we may have
368 * already bound before checking against other endpoints.
370 if (sctp_bind_addr_match(bp, addr, sp))
373 /* Make sure we are allowed to bind here.
374 * The function sctp_get_port_local() does duplicate address
377 addr->v4.sin_port = htons(snum);
378 if ((ret = sctp_get_port_local(sk, addr))) {
382 /* Refresh ephemeral port. */
384 bp->port = inet_sk(sk)->inet_num;
386 /* Add the address to the bind address list.
387 * Use GFP_ATOMIC since BHs will be disabled.
389 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
391 /* Copy back into socket for getsockname() use. */
393 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
394 sp->pf->to_sk_saddr(addr, sk);
400 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
402 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
403 * at any one time. If a sender, after sending an ASCONF chunk, decides
404 * it needs to transfer another ASCONF Chunk, it MUST wait until the
405 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
406 * subsequent ASCONF. Note this restriction binds each side, so at any
407 * time two ASCONF may be in-transit on any given association (one sent
408 * from each endpoint).
410 static int sctp_send_asconf(struct sctp_association *asoc,
411 struct sctp_chunk *chunk)
413 struct net *net = sock_net(asoc->base.sk);
416 /* If there is an outstanding ASCONF chunk, queue it for later
419 if (asoc->addip_last_asconf) {
420 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
424 /* Hold the chunk until an ASCONF_ACK is received. */
425 sctp_chunk_hold(chunk);
426 retval = sctp_primitive_ASCONF(net, asoc, chunk);
428 sctp_chunk_free(chunk);
430 asoc->addip_last_asconf = chunk;
436 /* Add a list of addresses as bind addresses to local endpoint or
439 * Basically run through each address specified in the addrs/addrcnt
440 * array/length pair, determine if it is IPv6 or IPv4 and call
441 * sctp_do_bind() on it.
443 * If any of them fails, then the operation will be reversed and the
444 * ones that were added will be removed.
446 * Only sctp_setsockopt_bindx() is supposed to call this function.
448 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
453 struct sockaddr *sa_addr;
456 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
460 for (cnt = 0; cnt < addrcnt; cnt++) {
461 /* The list may contain either IPv4 or IPv6 address;
462 * determine the address length for walking thru the list.
465 af = sctp_get_af_specific(sa_addr->sa_family);
471 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
474 addr_buf += af->sockaddr_len;
478 /* Failed. Cleanup the ones that have been added */
480 sctp_bindx_rem(sk, addrs, cnt);
488 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
489 * associations that are part of the endpoint indicating that a list of local
490 * addresses are added to the endpoint.
492 * If any of the addresses is already in the bind address list of the
493 * association, we do not send the chunk for that association. But it will not
494 * affect other associations.
496 * Only sctp_setsockopt_bindx() is supposed to call this function.
498 static int sctp_send_asconf_add_ip(struct sock *sk,
499 struct sockaddr *addrs,
502 struct net *net = sock_net(sk);
503 struct sctp_sock *sp;
504 struct sctp_endpoint *ep;
505 struct sctp_association *asoc;
506 struct sctp_bind_addr *bp;
507 struct sctp_chunk *chunk;
508 struct sctp_sockaddr_entry *laddr;
509 union sctp_addr *addr;
510 union sctp_addr saveaddr;
517 if (!net->sctp.addip_enable)
523 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
524 __func__, sk, addrs, addrcnt);
526 list_for_each_entry(asoc, &ep->asocs, asocs) {
527 if (!asoc->peer.asconf_capable)
530 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
533 if (!sctp_state(asoc, ESTABLISHED))
536 /* Check if any address in the packed array of addresses is
537 * in the bind address list of the association. If so,
538 * do not send the asconf chunk to its peer, but continue with
539 * other associations.
542 for (i = 0; i < addrcnt; i++) {
544 af = sctp_get_af_specific(addr->v4.sin_family);
550 if (sctp_assoc_lookup_laddr(asoc, addr))
553 addr_buf += af->sockaddr_len;
558 /* Use the first valid address in bind addr list of
559 * association as Address Parameter of ASCONF CHUNK.
561 bp = &asoc->base.bind_addr;
562 p = bp->address_list.next;
563 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
564 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
565 addrcnt, SCTP_PARAM_ADD_IP);
571 /* Add the new addresses to the bind address list with
572 * use_as_src set to 0.
575 for (i = 0; i < addrcnt; i++) {
577 af = sctp_get_af_specific(addr->v4.sin_family);
578 memcpy(&saveaddr, addr, af->sockaddr_len);
579 retval = sctp_add_bind_addr(bp, &saveaddr,
580 SCTP_ADDR_NEW, GFP_ATOMIC);
581 addr_buf += af->sockaddr_len;
583 if (asoc->src_out_of_asoc_ok) {
584 struct sctp_transport *trans;
586 list_for_each_entry(trans,
587 &asoc->peer.transport_addr_list, transports) {
588 /* Clear the source and route cache */
589 dst_release(trans->dst);
590 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
591 2*asoc->pathmtu, 4380));
592 trans->ssthresh = asoc->peer.i.a_rwnd;
593 trans->rto = asoc->rto_initial;
594 sctp_max_rto(asoc, trans);
595 trans->rtt = trans->srtt = trans->rttvar = 0;
596 sctp_transport_route(trans, NULL,
597 sctp_sk(asoc->base.sk));
600 retval = sctp_send_asconf(asoc, chunk);
607 /* Remove a list of addresses from bind addresses list. Do not remove the
610 * Basically run through each address specified in the addrs/addrcnt
611 * array/length pair, determine if it is IPv6 or IPv4 and call
612 * sctp_del_bind() on it.
614 * If any of them fails, then the operation will be reversed and the
615 * ones that were removed will be added back.
617 * At least one address has to be left; if only one address is
618 * available, the operation will return -EBUSY.
620 * Only sctp_setsockopt_bindx() is supposed to call this function.
622 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
624 struct sctp_sock *sp = sctp_sk(sk);
625 struct sctp_endpoint *ep = sp->ep;
627 struct sctp_bind_addr *bp = &ep->base.bind_addr;
630 union sctp_addr *sa_addr;
633 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
634 __func__, sk, addrs, addrcnt);
637 for (cnt = 0; cnt < addrcnt; cnt++) {
638 /* If the bind address list is empty or if there is only one
639 * bind address, there is nothing more to be removed (we need
640 * at least one address here).
642 if (list_empty(&bp->address_list) ||
643 (sctp_list_single_entry(&bp->address_list))) {
649 af = sctp_get_af_specific(sa_addr->sa.sa_family);
655 if (!af->addr_valid(sa_addr, sp, NULL)) {
656 retval = -EADDRNOTAVAIL;
660 if (sa_addr->v4.sin_port &&
661 sa_addr->v4.sin_port != htons(bp->port)) {
666 if (!sa_addr->v4.sin_port)
667 sa_addr->v4.sin_port = htons(bp->port);
669 /* FIXME - There is probably a need to check if sk->sk_saddr and
670 * sk->sk_rcv_addr are currently set to one of the addresses to
671 * be removed. This is something which needs to be looked into
672 * when we are fixing the outstanding issues with multi-homing
673 * socket routing and failover schemes. Refer to comments in
674 * sctp_do_bind(). -daisy
676 retval = sctp_del_bind_addr(bp, sa_addr);
678 addr_buf += af->sockaddr_len;
681 /* Failed. Add the ones that has been removed back */
683 sctp_bindx_add(sk, addrs, cnt);
691 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
692 * the associations that are part of the endpoint indicating that a list of
693 * local addresses are removed from the endpoint.
695 * If any of the addresses is already in the bind address list of the
696 * association, we do not send the chunk for that association. But it will not
697 * affect other associations.
699 * Only sctp_setsockopt_bindx() is supposed to call this function.
701 static int sctp_send_asconf_del_ip(struct sock *sk,
702 struct sockaddr *addrs,
705 struct net *net = sock_net(sk);
706 struct sctp_sock *sp;
707 struct sctp_endpoint *ep;
708 struct sctp_association *asoc;
709 struct sctp_transport *transport;
710 struct sctp_bind_addr *bp;
711 struct sctp_chunk *chunk;
712 union sctp_addr *laddr;
715 struct sctp_sockaddr_entry *saddr;
721 if (!net->sctp.addip_enable)
727 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
728 __func__, sk, addrs, addrcnt);
730 list_for_each_entry(asoc, &ep->asocs, asocs) {
732 if (!asoc->peer.asconf_capable)
735 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
738 if (!sctp_state(asoc, ESTABLISHED))
741 /* Check if any address in the packed array of addresses is
742 * not present in the bind address list of the association.
743 * If so, do not send the asconf chunk to its peer, but
744 * continue with other associations.
747 for (i = 0; i < addrcnt; i++) {
749 af = sctp_get_af_specific(laddr->v4.sin_family);
755 if (!sctp_assoc_lookup_laddr(asoc, laddr))
758 addr_buf += af->sockaddr_len;
763 /* Find one address in the association's bind address list
764 * that is not in the packed array of addresses. This is to
765 * make sure that we do not delete all the addresses in the
768 bp = &asoc->base.bind_addr;
769 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
771 if ((laddr == NULL) && (addrcnt == 1)) {
772 if (asoc->asconf_addr_del_pending)
774 asoc->asconf_addr_del_pending =
775 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
776 if (asoc->asconf_addr_del_pending == NULL) {
780 asoc->asconf_addr_del_pending->sa.sa_family =
782 asoc->asconf_addr_del_pending->v4.sin_port =
784 if (addrs->sa_family == AF_INET) {
785 struct sockaddr_in *sin;
787 sin = (struct sockaddr_in *)addrs;
788 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
789 } else if (addrs->sa_family == AF_INET6) {
790 struct sockaddr_in6 *sin6;
792 sin6 = (struct sockaddr_in6 *)addrs;
793 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
796 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
797 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
798 asoc->asconf_addr_del_pending);
800 asoc->src_out_of_asoc_ok = 1;
808 /* We do not need RCU protection throughout this loop
809 * because this is done under a socket lock from the
812 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
820 /* Reset use_as_src flag for the addresses in the bind address
821 * list that are to be deleted.
824 for (i = 0; i < addrcnt; i++) {
826 af = sctp_get_af_specific(laddr->v4.sin_family);
827 list_for_each_entry(saddr, &bp->address_list, list) {
828 if (sctp_cmp_addr_exact(&saddr->a, laddr))
829 saddr->state = SCTP_ADDR_DEL;
831 addr_buf += af->sockaddr_len;
834 /* Update the route and saddr entries for all the transports
835 * as some of the addresses in the bind address list are
836 * about to be deleted and cannot be used as source addresses.
838 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
840 dst_release(transport->dst);
841 sctp_transport_route(transport, NULL,
842 sctp_sk(asoc->base.sk));
846 /* We don't need to transmit ASCONF */
848 retval = sctp_send_asconf(asoc, chunk);
854 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
855 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
857 struct sock *sk = sctp_opt2sk(sp);
858 union sctp_addr *addr;
861 /* It is safe to write port space in caller. */
863 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
864 af = sctp_get_af_specific(addr->sa.sa_family);
867 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
870 if (addrw->state == SCTP_ADDR_NEW)
871 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
873 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
876 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
879 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
882 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
883 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
886 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
887 * Section 3.1.2 for this usage.
889 * addrs is a pointer to an array of one or more socket addresses. Each
890 * address is contained in its appropriate structure (i.e. struct
891 * sockaddr_in or struct sockaddr_in6) the family of the address type
892 * must be used to distinguish the address length (note that this
893 * representation is termed a "packed array" of addresses). The caller
894 * specifies the number of addresses in the array with addrcnt.
896 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
897 * -1, and sets errno to the appropriate error code.
899 * For SCTP, the port given in each socket address must be the same, or
900 * sctp_bindx() will fail, setting errno to EINVAL.
902 * The flags parameter is formed from the bitwise OR of zero or more of
903 * the following currently defined flags:
905 * SCTP_BINDX_ADD_ADDR
907 * SCTP_BINDX_REM_ADDR
909 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
910 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
911 * addresses from the association. The two flags are mutually exclusive;
912 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
913 * not remove all addresses from an association; sctp_bindx() will
914 * reject such an attempt with EINVAL.
916 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
917 * additional addresses with an endpoint after calling bind(). Or use
918 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
919 * socket is associated with so that no new association accepted will be
920 * associated with those addresses. If the endpoint supports dynamic
921 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
922 * endpoint to send the appropriate message to the peer to change the
923 * peers address lists.
925 * Adding and removing addresses from a connected association is
926 * optional functionality. Implementations that do not support this
927 * functionality should return EOPNOTSUPP.
929 * Basically do nothing but copying the addresses from user to kernel
930 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
931 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
934 * We don't use copy_from_user() for optimization: we first do the
935 * sanity checks (buffer size -fast- and access check-healthy
936 * pointer); if all of those succeed, then we can alloc the memory
937 * (expensive operation) needed to copy the data to kernel. Then we do
938 * the copying without checking the user space area
939 * (__copy_from_user()).
941 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
944 * sk The sk of the socket
945 * addrs The pointer to the addresses in user land
946 * addrssize Size of the addrs buffer
947 * op Operation to perform (add or remove, see the flags of
950 * Returns 0 if ok, <0 errno code on error.
952 static int sctp_setsockopt_bindx(struct sock *sk,
953 struct sockaddr __user *addrs,
954 int addrs_size, int op)
956 struct sockaddr *kaddrs;
960 struct sockaddr *sa_addr;
964 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
965 __func__, sk, addrs, addrs_size, op);
967 if (unlikely(addrs_size <= 0))
970 /* Check the user passed a healthy pointer. */
971 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
974 /* Alloc space for the address array in kernel memory. */
975 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
976 if (unlikely(!kaddrs))
979 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
984 /* Walk through the addrs buffer and count the number of addresses. */
986 while (walk_size < addrs_size) {
987 if (walk_size + sizeof(sa_family_t) > addrs_size) {
993 af = sctp_get_af_specific(sa_addr->sa_family);
995 /* If the address family is not supported or if this address
996 * causes the address buffer to overflow return EINVAL.
998 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1003 addr_buf += af->sockaddr_len;
1004 walk_size += af->sockaddr_len;
1009 case SCTP_BINDX_ADD_ADDR:
1010 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1013 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1016 case SCTP_BINDX_REM_ADDR:
1017 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1020 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1034 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1036 * Common routine for handling connect() and sctp_connectx().
1037 * Connect will come in with just a single address.
1039 static int __sctp_connect(struct sock *sk,
1040 struct sockaddr *kaddrs,
1042 sctp_assoc_t *assoc_id)
1044 struct net *net = sock_net(sk);
1045 struct sctp_sock *sp;
1046 struct sctp_endpoint *ep;
1047 struct sctp_association *asoc = NULL;
1048 struct sctp_association *asoc2;
1049 struct sctp_transport *transport;
1056 union sctp_addr *sa_addr = NULL;
1058 unsigned short port;
1059 unsigned int f_flags = 0;
1064 /* connect() cannot be done on a socket that is already in ESTABLISHED
1065 * state - UDP-style peeled off socket or a TCP-style socket that
1066 * is already connected.
1067 * It cannot be done even on a TCP-style listening socket.
1069 if (sctp_sstate(sk, ESTABLISHED) ||
1070 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1075 /* Walk through the addrs buffer and count the number of addresses. */
1077 while (walk_size < addrs_size) {
1080 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1086 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1088 /* If the address family is not supported or if this address
1089 * causes the address buffer to overflow return EINVAL.
1091 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1096 port = ntohs(sa_addr->v4.sin_port);
1098 /* Save current address so we can work with it */
1099 memcpy(&to, sa_addr, af->sockaddr_len);
1101 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1105 /* Make sure the destination port is correctly set
1108 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1113 /* Check if there already is a matching association on the
1114 * endpoint (other than the one created here).
1116 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1117 if (asoc2 && asoc2 != asoc) {
1118 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1125 /* If we could not find a matching association on the endpoint,
1126 * make sure that there is no peeled-off association matching
1127 * the peer address even on another socket.
1129 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1130 err = -EADDRNOTAVAIL;
1135 /* If a bind() or sctp_bindx() is not called prior to
1136 * an sctp_connectx() call, the system picks an
1137 * ephemeral port and will choose an address set
1138 * equivalent to binding with a wildcard address.
1140 if (!ep->base.bind_addr.port) {
1141 if (sctp_autobind(sk)) {
1147 * If an unprivileged user inherits a 1-many
1148 * style socket with open associations on a
1149 * privileged port, it MAY be permitted to
1150 * accept new associations, but it SHOULD NOT
1151 * be permitted to open new associations.
1153 if (ep->base.bind_addr.port < PROT_SOCK &&
1154 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1160 scope = sctp_scope(&to);
1161 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1167 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1175 /* Prime the peer's transport structures. */
1176 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1184 addr_buf += af->sockaddr_len;
1185 walk_size += af->sockaddr_len;
1188 /* In case the user of sctp_connectx() wants an association
1189 * id back, assign one now.
1192 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1197 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1202 /* Initialize sk's dport and daddr for getpeername() */
1203 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1204 sp->pf->to_sk_daddr(sa_addr, sk);
1207 /* in-kernel sockets don't generally have a file allocated to them
1208 * if all they do is call sock_create_kern().
1210 if (sk->sk_socket->file)
1211 f_flags = sk->sk_socket->file->f_flags;
1213 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1216 *assoc_id = asoc->assoc_id;
1217 err = sctp_wait_for_connect(asoc, &timeo);
1218 /* Note: the asoc may be freed after the return of
1219 * sctp_wait_for_connect.
1222 /* Don't free association on exit. */
1226 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1227 __func__, asoc, kaddrs, err);
1230 /* sctp_primitive_ASSOCIATE may have added this association
1231 * To the hash table, try to unhash it, just in case, its a noop
1232 * if it wasn't hashed so we're safe
1234 sctp_unhash_established(asoc);
1235 sctp_association_free(asoc);
1240 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1243 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1244 * sctp_assoc_t *asoc);
1246 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1247 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1248 * or IPv6 addresses.
1250 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1251 * Section 3.1.2 for this usage.
1253 * addrs is a pointer to an array of one or more socket addresses. Each
1254 * address is contained in its appropriate structure (i.e. struct
1255 * sockaddr_in or struct sockaddr_in6) the family of the address type
1256 * must be used to distengish the address length (note that this
1257 * representation is termed a "packed array" of addresses). The caller
1258 * specifies the number of addresses in the array with addrcnt.
1260 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1261 * the association id of the new association. On failure, sctp_connectx()
1262 * returns -1, and sets errno to the appropriate error code. The assoc_id
1263 * is not touched by the kernel.
1265 * For SCTP, the port given in each socket address must be the same, or
1266 * sctp_connectx() will fail, setting errno to EINVAL.
1268 * An application can use sctp_connectx to initiate an association with
1269 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1270 * allows a caller to specify multiple addresses at which a peer can be
1271 * reached. The way the SCTP stack uses the list of addresses to set up
1272 * the association is implementation dependent. This function only
1273 * specifies that the stack will try to make use of all the addresses in
1274 * the list when needed.
1276 * Note that the list of addresses passed in is only used for setting up
1277 * the association. It does not necessarily equal the set of addresses
1278 * the peer uses for the resulting association. If the caller wants to
1279 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1280 * retrieve them after the association has been set up.
1282 * Basically do nothing but copying the addresses from user to kernel
1283 * land and invoking either sctp_connectx(). This is used for tunneling
1284 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1286 * We don't use copy_from_user() for optimization: we first do the
1287 * sanity checks (buffer size -fast- and access check-healthy
1288 * pointer); if all of those succeed, then we can alloc the memory
1289 * (expensive operation) needed to copy the data to kernel. Then we do
1290 * the copying without checking the user space area
1291 * (__copy_from_user()).
1293 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1296 * sk The sk of the socket
1297 * addrs The pointer to the addresses in user land
1298 * addrssize Size of the addrs buffer
1300 * Returns >=0 if ok, <0 errno code on error.
1302 static int __sctp_setsockopt_connectx(struct sock *sk,
1303 struct sockaddr __user *addrs,
1305 sctp_assoc_t *assoc_id)
1307 struct sockaddr *kaddrs;
1308 gfp_t gfp = GFP_KERNEL;
1311 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1312 __func__, sk, addrs, addrs_size);
1314 if (unlikely(addrs_size <= 0))
1317 /* Check the user passed a healthy pointer. */
1318 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1321 /* Alloc space for the address array in kernel memory. */
1322 if (sk->sk_socket->file)
1323 gfp = GFP_USER | __GFP_NOWARN;
1324 kaddrs = kmalloc(addrs_size, gfp);
1325 if (unlikely(!kaddrs))
1328 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1331 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1340 * This is an older interface. It's kept for backward compatibility
1341 * to the option that doesn't provide association id.
1343 static int sctp_setsockopt_connectx_old(struct sock *sk,
1344 struct sockaddr __user *addrs,
1347 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1351 * New interface for the API. The since the API is done with a socket
1352 * option, to make it simple we feed back the association id is as a return
1353 * indication to the call. Error is always negative and association id is
1356 static int sctp_setsockopt_connectx(struct sock *sk,
1357 struct sockaddr __user *addrs,
1360 sctp_assoc_t assoc_id = 0;
1363 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1372 * New (hopefully final) interface for the API.
1373 * We use the sctp_getaddrs_old structure so that use-space library
1374 * can avoid any unnecessary allocations. The only different part
1375 * is that we store the actual length of the address buffer into the
1376 * addrs_num structure member. That way we can re-use the existing
1379 #ifdef CONFIG_COMPAT
1380 struct compat_sctp_getaddrs_old {
1381 sctp_assoc_t assoc_id;
1383 compat_uptr_t addrs; /* struct sockaddr * */
1387 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1388 char __user *optval,
1391 struct sctp_getaddrs_old param;
1392 sctp_assoc_t assoc_id = 0;
1395 #ifdef CONFIG_COMPAT
1396 if (is_compat_task()) {
1397 struct compat_sctp_getaddrs_old param32;
1399 if (len < sizeof(param32))
1401 if (copy_from_user(¶m32, optval, sizeof(param32)))
1404 param.assoc_id = param32.assoc_id;
1405 param.addr_num = param32.addr_num;
1406 param.addrs = compat_ptr(param32.addrs);
1410 if (len < sizeof(param))
1412 if (copy_from_user(¶m, optval, sizeof(param)))
1416 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1417 param.addrs, param.addr_num,
1419 if (err == 0 || err == -EINPROGRESS) {
1420 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1422 if (put_user(sizeof(assoc_id), optlen))
1429 /* API 3.1.4 close() - UDP Style Syntax
1430 * Applications use close() to perform graceful shutdown (as described in
1431 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1432 * by a UDP-style socket.
1436 * ret = close(int sd);
1438 * sd - the socket descriptor of the associations to be closed.
1440 * To gracefully shutdown a specific association represented by the
1441 * UDP-style socket, an application should use the sendmsg() call,
1442 * passing no user data, but including the appropriate flag in the
1443 * ancillary data (see Section xxxx).
1445 * If sd in the close() call is a branched-off socket representing only
1446 * one association, the shutdown is performed on that association only.
1448 * 4.1.6 close() - TCP Style Syntax
1450 * Applications use close() to gracefully close down an association.
1454 * int close(int sd);
1456 * sd - the socket descriptor of the association to be closed.
1458 * After an application calls close() on a socket descriptor, no further
1459 * socket operations will succeed on that descriptor.
1461 * API 7.1.4 SO_LINGER
1463 * An application using the TCP-style socket can use this option to
1464 * perform the SCTP ABORT primitive. The linger option structure is:
1467 * int l_onoff; // option on/off
1468 * int l_linger; // linger time
1471 * To enable the option, set l_onoff to 1. If the l_linger value is set
1472 * to 0, calling close() is the same as the ABORT primitive. If the
1473 * value is set to a negative value, the setsockopt() call will return
1474 * an error. If the value is set to a positive value linger_time, the
1475 * close() can be blocked for at most linger_time ms. If the graceful
1476 * shutdown phase does not finish during this period, close() will
1477 * return but the graceful shutdown phase continues in the system.
1479 static void sctp_close(struct sock *sk, long timeout)
1481 struct net *net = sock_net(sk);
1482 struct sctp_endpoint *ep;
1483 struct sctp_association *asoc;
1484 struct list_head *pos, *temp;
1485 unsigned int data_was_unread;
1487 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1490 sk->sk_shutdown = SHUTDOWN_MASK;
1491 sk->sk_state = SCTP_SS_CLOSING;
1493 ep = sctp_sk(sk)->ep;
1495 /* Clean up any skbs sitting on the receive queue. */
1496 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1497 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1499 /* Walk all associations on an endpoint. */
1500 list_for_each_safe(pos, temp, &ep->asocs) {
1501 asoc = list_entry(pos, struct sctp_association, asocs);
1503 if (sctp_style(sk, TCP)) {
1504 /* A closed association can still be in the list if
1505 * it belongs to a TCP-style listening socket that is
1506 * not yet accepted. If so, free it. If not, send an
1507 * ABORT or SHUTDOWN based on the linger options.
1509 if (sctp_state(asoc, CLOSED)) {
1510 sctp_unhash_established(asoc);
1511 sctp_association_free(asoc);
1516 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1517 !skb_queue_empty(&asoc->ulpq.reasm) ||
1518 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1519 struct sctp_chunk *chunk;
1521 chunk = sctp_make_abort_user(asoc, NULL, 0);
1522 sctp_primitive_ABORT(net, asoc, chunk);
1524 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1527 /* On a TCP-style socket, block for at most linger_time if set. */
1528 if (sctp_style(sk, TCP) && timeout)
1529 sctp_wait_for_close(sk, timeout);
1531 /* This will run the backlog queue. */
1534 /* Supposedly, no process has access to the socket, but
1535 * the net layers still may.
1536 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1537 * held and that should be grabbed before socket lock.
1539 spin_lock_bh(&net->sctp.addr_wq_lock);
1542 /* Hold the sock, since sk_common_release() will put sock_put()
1543 * and we have just a little more cleanup.
1546 sk_common_release(sk);
1549 spin_unlock_bh(&net->sctp.addr_wq_lock);
1553 SCTP_DBG_OBJCNT_DEC(sock);
1556 /* Handle EPIPE error. */
1557 static int sctp_error(struct sock *sk, int flags, int err)
1560 err = sock_error(sk) ? : -EPIPE;
1561 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1562 send_sig(SIGPIPE, current, 0);
1566 /* API 3.1.3 sendmsg() - UDP Style Syntax
1568 * An application uses sendmsg() and recvmsg() calls to transmit data to
1569 * and receive data from its peer.
1571 * ssize_t sendmsg(int socket, const struct msghdr *message,
1574 * socket - the socket descriptor of the endpoint.
1575 * message - pointer to the msghdr structure which contains a single
1576 * user message and possibly some ancillary data.
1578 * See Section 5 for complete description of the data
1581 * flags - flags sent or received with the user message, see Section
1582 * 5 for complete description of the flags.
1584 * Note: This function could use a rewrite especially when explicit
1585 * connect support comes in.
1587 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1589 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1591 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1593 struct net *net = sock_net(sk);
1594 struct sctp_sock *sp;
1595 struct sctp_endpoint *ep;
1596 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1597 struct sctp_transport *transport, *chunk_tp;
1598 struct sctp_chunk *chunk;
1600 struct sockaddr *msg_name = NULL;
1601 struct sctp_sndrcvinfo default_sinfo;
1602 struct sctp_sndrcvinfo *sinfo;
1603 struct sctp_initmsg *sinit;
1604 sctp_assoc_t associd = 0;
1605 sctp_cmsgs_t cmsgs = { NULL };
1607 bool fill_sinfo_ttl = false, wait_connect = false;
1608 struct sctp_datamsg *datamsg;
1609 int msg_flags = msg->msg_flags;
1610 __u16 sinfo_flags = 0;
1618 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1621 /* We cannot send a message over a TCP-style listening socket. */
1622 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1627 /* Parse out the SCTP CMSGs. */
1628 err = sctp_msghdr_parse(msg, &cmsgs);
1630 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1634 /* Fetch the destination address for this packet. This
1635 * address only selects the association--it is not necessarily
1636 * the address we will send to.
1637 * For a peeled-off socket, msg_name is ignored.
1639 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1640 int msg_namelen = msg->msg_namelen;
1642 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1647 if (msg_namelen > sizeof(to))
1648 msg_namelen = sizeof(to);
1649 memcpy(&to, msg->msg_name, msg_namelen);
1650 msg_name = msg->msg_name;
1654 if (cmsgs.sinfo != NULL) {
1655 memset(&default_sinfo, 0, sizeof(default_sinfo));
1656 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1657 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1658 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1659 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1660 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1662 sinfo = &default_sinfo;
1663 fill_sinfo_ttl = true;
1665 sinfo = cmsgs.srinfo;
1667 /* Did the user specify SNDINFO/SNDRCVINFO? */
1669 sinfo_flags = sinfo->sinfo_flags;
1670 associd = sinfo->sinfo_assoc_id;
1673 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1674 msg_len, sinfo_flags);
1676 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1677 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1682 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1683 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1684 * If SCTP_ABORT is set, the message length could be non zero with
1685 * the msg_iov set to the user abort reason.
1687 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1688 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1693 /* If SCTP_ADDR_OVER is set, there must be an address
1694 * specified in msg_name.
1696 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1703 pr_debug("%s: about to look up association\n", __func__);
1707 /* If a msg_name has been specified, assume this is to be used. */
1709 /* Look for a matching association on the endpoint. */
1710 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1712 /* If we could not find a matching association on the
1713 * endpoint, make sure that it is not a TCP-style
1714 * socket that already has an association or there is
1715 * no peeled-off association on another socket.
1717 if ((sctp_style(sk, TCP) &&
1718 sctp_sstate(sk, ESTABLISHED)) ||
1719 sctp_endpoint_is_peeled_off(ep, &to)) {
1720 err = -EADDRNOTAVAIL;
1725 asoc = sctp_id2assoc(sk, associd);
1733 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1735 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1736 * socket that has an association in CLOSED state. This can
1737 * happen when an accepted socket has an association that is
1740 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1745 if (sinfo_flags & SCTP_EOF) {
1746 pr_debug("%s: shutting down association:%p\n",
1749 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1753 if (sinfo_flags & SCTP_ABORT) {
1755 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1761 pr_debug("%s: aborting association:%p\n",
1764 sctp_primitive_ABORT(net, asoc, chunk);
1770 /* Do we need to create the association? */
1772 pr_debug("%s: there is no association yet\n", __func__);
1774 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1779 /* Check for invalid stream against the stream counts,
1780 * either the default or the user specified stream counts.
1783 if (!sinit || !sinit->sinit_num_ostreams) {
1784 /* Check against the defaults. */
1785 if (sinfo->sinfo_stream >=
1786 sp->initmsg.sinit_num_ostreams) {
1791 /* Check against the requested. */
1792 if (sinfo->sinfo_stream >=
1793 sinit->sinit_num_ostreams) {
1801 * API 3.1.2 bind() - UDP Style Syntax
1802 * If a bind() or sctp_bindx() is not called prior to a
1803 * sendmsg() call that initiates a new association, the
1804 * system picks an ephemeral port and will choose an address
1805 * set equivalent to binding with a wildcard address.
1807 if (!ep->base.bind_addr.port) {
1808 if (sctp_autobind(sk)) {
1814 * If an unprivileged user inherits a one-to-many
1815 * style socket with open associations on a privileged
1816 * port, it MAY be permitted to accept new associations,
1817 * but it SHOULD NOT be permitted to open new
1820 if (ep->base.bind_addr.port < PROT_SOCK &&
1821 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1827 scope = sctp_scope(&to);
1828 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1834 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1840 /* If the SCTP_INIT ancillary data is specified, set all
1841 * the association init values accordingly.
1844 if (sinit->sinit_num_ostreams) {
1845 asoc->c.sinit_num_ostreams =
1846 sinit->sinit_num_ostreams;
1848 if (sinit->sinit_max_instreams) {
1849 asoc->c.sinit_max_instreams =
1850 sinit->sinit_max_instreams;
1852 if (sinit->sinit_max_attempts) {
1853 asoc->max_init_attempts
1854 = sinit->sinit_max_attempts;
1856 if (sinit->sinit_max_init_timeo) {
1857 asoc->max_init_timeo =
1858 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1862 /* Prime the peer's transport structures. */
1863 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1870 /* ASSERT: we have a valid association at this point. */
1871 pr_debug("%s: we have a valid association\n", __func__);
1874 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1875 * one with some defaults.
1877 memset(&default_sinfo, 0, sizeof(default_sinfo));
1878 default_sinfo.sinfo_stream = asoc->default_stream;
1879 default_sinfo.sinfo_flags = asoc->default_flags;
1880 default_sinfo.sinfo_ppid = asoc->default_ppid;
1881 default_sinfo.sinfo_context = asoc->default_context;
1882 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1883 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1885 sinfo = &default_sinfo;
1886 } else if (fill_sinfo_ttl) {
1887 /* In case SNDINFO was specified, we still need to fill
1888 * it with a default ttl from the assoc here.
1890 sinfo->sinfo_timetolive = asoc->default_timetolive;
1893 /* API 7.1.7, the sndbuf size per association bounds the
1894 * maximum size of data that can be sent in a single send call.
1896 if (msg_len > sk->sk_sndbuf) {
1901 if (asoc->pmtu_pending)
1902 sctp_assoc_pending_pmtu(sk, asoc);
1904 /* If fragmentation is disabled and the message length exceeds the
1905 * association fragmentation point, return EMSGSIZE. The I-D
1906 * does not specify what this error is, but this looks like
1909 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1914 /* Check for invalid stream. */
1915 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1920 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1921 if (!sctp_wspace(asoc)) {
1922 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1927 /* If an address is passed with the sendto/sendmsg call, it is used
1928 * to override the primary destination address in the TCP model, or
1929 * when SCTP_ADDR_OVER flag is set in the UDP model.
1931 if ((sctp_style(sk, TCP) && msg_name) ||
1932 (sinfo_flags & SCTP_ADDR_OVER)) {
1933 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1941 /* Auto-connect, if we aren't connected already. */
1942 if (sctp_state(asoc, CLOSED)) {
1943 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1947 wait_connect = true;
1948 pr_debug("%s: we associated primitively\n", __func__);
1951 /* Break the message into multiple chunks of maximum size. */
1952 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1953 if (IS_ERR(datamsg)) {
1954 err = PTR_ERR(datamsg);
1958 /* Now send the (possibly) fragmented message. */
1959 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1960 /* Do accounting for the write space. */
1961 sctp_set_owner_w(chunk);
1963 chunk->transport = chunk_tp;
1966 /* Send it to the lower layers. Note: all chunks
1967 * must either fail or succeed. The lower layer
1968 * works that way today. Keep it that way or this
1971 err = sctp_primitive_SEND(net, asoc, datamsg);
1972 sctp_datamsg_put(datamsg);
1973 /* Did the lower layer accept the chunk? */
1977 pr_debug("%s: we sent primitively\n", __func__);
1981 if (unlikely(wait_connect)) {
1982 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
1983 sctp_wait_for_connect(asoc, &timeo);
1986 /* If we are already past ASSOCIATE, the lower
1987 * layers are responsible for association cleanup.
1993 sctp_unhash_established(asoc);
1994 sctp_association_free(asoc);
2000 return sctp_error(sk, msg_flags, err);
2007 err = sock_error(sk);
2017 /* This is an extended version of skb_pull() that removes the data from the
2018 * start of a skb even when data is spread across the list of skb's in the
2019 * frag_list. len specifies the total amount of data that needs to be removed.
2020 * when 'len' bytes could be removed from the skb, it returns 0.
2021 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2022 * could not be removed.
2024 static int sctp_skb_pull(struct sk_buff *skb, int len)
2026 struct sk_buff *list;
2027 int skb_len = skb_headlen(skb);
2030 if (len <= skb_len) {
2031 __skb_pull(skb, len);
2035 __skb_pull(skb, skb_len);
2037 skb_walk_frags(skb, list) {
2038 rlen = sctp_skb_pull(list, len);
2039 skb->len -= (len-rlen);
2040 skb->data_len -= (len-rlen);
2051 /* API 3.1.3 recvmsg() - UDP Style Syntax
2053 * ssize_t recvmsg(int socket, struct msghdr *message,
2056 * socket - the socket descriptor of the endpoint.
2057 * message - pointer to the msghdr structure which contains a single
2058 * user message and possibly some ancillary data.
2060 * See Section 5 for complete description of the data
2063 * flags - flags sent or received with the user message, see Section
2064 * 5 for complete description of the flags.
2066 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2067 int noblock, int flags, int *addr_len)
2069 struct sctp_ulpevent *event = NULL;
2070 struct sctp_sock *sp = sctp_sk(sk);
2071 struct sk_buff *skb;
2076 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2077 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2082 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2087 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2091 /* Get the total length of the skb including any skb's in the
2100 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2102 event = sctp_skb2event(skb);
2107 sock_recv_ts_and_drops(msg, sk, skb);
2108 if (sctp_ulpevent_is_notification(event)) {
2109 msg->msg_flags |= MSG_NOTIFICATION;
2110 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2112 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2115 /* Check if we allow SCTP_NXTINFO. */
2116 if (sp->recvnxtinfo)
2117 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2118 /* Check if we allow SCTP_RCVINFO. */
2119 if (sp->recvrcvinfo)
2120 sctp_ulpevent_read_rcvinfo(event, msg);
2121 /* Check if we allow SCTP_SNDRCVINFO. */
2122 if (sp->subscribe.sctp_data_io_event)
2123 sctp_ulpevent_read_sndrcvinfo(event, msg);
2127 /* If skb's length exceeds the user's buffer, update the skb and
2128 * push it back to the receive_queue so that the next call to
2129 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2131 if (skb_len > copied) {
2132 msg->msg_flags &= ~MSG_EOR;
2133 if (flags & MSG_PEEK)
2135 sctp_skb_pull(skb, copied);
2136 skb_queue_head(&sk->sk_receive_queue, skb);
2138 /* When only partial message is copied to the user, increase
2139 * rwnd by that amount. If all the data in the skb is read,
2140 * rwnd is updated when the event is freed.
2142 if (!sctp_ulpevent_is_notification(event))
2143 sctp_assoc_rwnd_increase(event->asoc, copied);
2145 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2146 (event->msg_flags & MSG_EOR))
2147 msg->msg_flags |= MSG_EOR;
2149 msg->msg_flags &= ~MSG_EOR;
2152 if (flags & MSG_PEEK) {
2153 /* Release the skb reference acquired after peeking the skb in
2154 * sctp_skb_recv_datagram().
2158 /* Free the event which includes releasing the reference to
2159 * the owner of the skb, freeing the skb and updating the
2162 sctp_ulpevent_free(event);
2169 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2171 * This option is a on/off flag. If enabled no SCTP message
2172 * fragmentation will be performed. Instead if a message being sent
2173 * exceeds the current PMTU size, the message will NOT be sent and
2174 * instead a error will be indicated to the user.
2176 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2177 char __user *optval,
2178 unsigned int optlen)
2182 if (optlen < sizeof(int))
2185 if (get_user(val, (int __user *)optval))
2188 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2193 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2194 unsigned int optlen)
2196 struct sctp_association *asoc;
2197 struct sctp_ulpevent *event;
2199 if (optlen > sizeof(struct sctp_event_subscribe))
2201 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2204 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2205 * if there is no data to be sent or retransmit, the stack will
2206 * immediately send up this notification.
2208 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2209 &sctp_sk(sk)->subscribe)) {
2210 asoc = sctp_id2assoc(sk, 0);
2212 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2213 event = sctp_ulpevent_make_sender_dry_event(asoc,
2218 sctp_ulpq_tail_event(&asoc->ulpq, event);
2225 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2227 * This socket option is applicable to the UDP-style socket only. When
2228 * set it will cause associations that are idle for more than the
2229 * specified number of seconds to automatically close. An association
2230 * being idle is defined an association that has NOT sent or received
2231 * user data. The special value of '0' indicates that no automatic
2232 * close of any associations should be performed. The option expects an
2233 * integer defining the number of seconds of idle time before an
2234 * association is closed.
2236 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2237 unsigned int optlen)
2239 struct sctp_sock *sp = sctp_sk(sk);
2240 struct net *net = sock_net(sk);
2242 /* Applicable to UDP-style socket only */
2243 if (sctp_style(sk, TCP))
2245 if (optlen != sizeof(int))
2247 if (copy_from_user(&sp->autoclose, optval, optlen))
2250 if (sp->autoclose > net->sctp.max_autoclose)
2251 sp->autoclose = net->sctp.max_autoclose;
2256 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2258 * Applications can enable or disable heartbeats for any peer address of
2259 * an association, modify an address's heartbeat interval, force a
2260 * heartbeat to be sent immediately, and adjust the address's maximum
2261 * number of retransmissions sent before an address is considered
2262 * unreachable. The following structure is used to access and modify an
2263 * address's parameters:
2265 * struct sctp_paddrparams {
2266 * sctp_assoc_t spp_assoc_id;
2267 * struct sockaddr_storage spp_address;
2268 * uint32_t spp_hbinterval;
2269 * uint16_t spp_pathmaxrxt;
2270 * uint32_t spp_pathmtu;
2271 * uint32_t spp_sackdelay;
2272 * uint32_t spp_flags;
2275 * spp_assoc_id - (one-to-many style socket) This is filled in the
2276 * application, and identifies the association for
2278 * spp_address - This specifies which address is of interest.
2279 * spp_hbinterval - This contains the value of the heartbeat interval,
2280 * in milliseconds. If a value of zero
2281 * is present in this field then no changes are to
2282 * be made to this parameter.
2283 * spp_pathmaxrxt - This contains the maximum number of
2284 * retransmissions before this address shall be
2285 * considered unreachable. If a value of zero
2286 * is present in this field then no changes are to
2287 * be made to this parameter.
2288 * spp_pathmtu - When Path MTU discovery is disabled the value
2289 * specified here will be the "fixed" path mtu.
2290 * Note that if the spp_address field is empty
2291 * then all associations on this address will
2292 * have this fixed path mtu set upon them.
2294 * spp_sackdelay - When delayed sack is enabled, this value specifies
2295 * the number of milliseconds that sacks will be delayed
2296 * for. This value will apply to all addresses of an
2297 * association if the spp_address field is empty. Note
2298 * also, that if delayed sack is enabled and this
2299 * value is set to 0, no change is made to the last
2300 * recorded delayed sack timer value.
2302 * spp_flags - These flags are used to control various features
2303 * on an association. The flag field may contain
2304 * zero or more of the following options.
2306 * SPP_HB_ENABLE - Enable heartbeats on the
2307 * specified address. Note that if the address
2308 * field is empty all addresses for the association
2309 * have heartbeats enabled upon them.
2311 * SPP_HB_DISABLE - Disable heartbeats on the
2312 * speicifed address. Note that if the address
2313 * field is empty all addresses for the association
2314 * will have their heartbeats disabled. Note also
2315 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2316 * mutually exclusive, only one of these two should
2317 * be specified. Enabling both fields will have
2318 * undetermined results.
2320 * SPP_HB_DEMAND - Request a user initiated heartbeat
2321 * to be made immediately.
2323 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2324 * heartbeat delayis to be set to the value of 0
2327 * SPP_PMTUD_ENABLE - This field will enable PMTU
2328 * discovery upon the specified address. Note that
2329 * if the address feild is empty then all addresses
2330 * on the association are effected.
2332 * SPP_PMTUD_DISABLE - This field will disable 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. Not also that
2336 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2337 * exclusive. Enabling both will have undetermined
2340 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2341 * on delayed sack. The time specified in spp_sackdelay
2342 * is used to specify the sack delay for this address. Note
2343 * that if spp_address is empty then all addresses will
2344 * enable delayed sack and take on the sack delay
2345 * value specified in spp_sackdelay.
2346 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2347 * off delayed sack. If the spp_address field is blank then
2348 * delayed sack is disabled for the entire association. Note
2349 * also that this field is mutually exclusive to
2350 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2353 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2354 struct sctp_transport *trans,
2355 struct sctp_association *asoc,
2356 struct sctp_sock *sp,
2359 int sackdelay_change)
2363 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2364 struct net *net = sock_net(trans->asoc->base.sk);
2366 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2371 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2372 * this field is ignored. Note also that a value of zero indicates
2373 * the current setting should be left unchanged.
2375 if (params->spp_flags & SPP_HB_ENABLE) {
2377 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2378 * set. This lets us use 0 value when this flag
2381 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2382 params->spp_hbinterval = 0;
2384 if (params->spp_hbinterval ||
2385 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2388 msecs_to_jiffies(params->spp_hbinterval);
2391 msecs_to_jiffies(params->spp_hbinterval);
2393 sp->hbinterval = params->spp_hbinterval;
2400 trans->param_flags =
2401 (trans->param_flags & ~SPP_HB) | hb_change;
2404 (asoc->param_flags & ~SPP_HB) | hb_change;
2407 (sp->param_flags & ~SPP_HB) | hb_change;
2411 /* When Path MTU discovery is disabled the value specified here will
2412 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2413 * include the flag SPP_PMTUD_DISABLE for this field to have any
2416 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2418 trans->pathmtu = params->spp_pathmtu;
2419 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2421 asoc->pathmtu = params->spp_pathmtu;
2422 sctp_frag_point(asoc, params->spp_pathmtu);
2424 sp->pathmtu = params->spp_pathmtu;
2430 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2431 (params->spp_flags & SPP_PMTUD_ENABLE);
2432 trans->param_flags =
2433 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2435 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2436 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2440 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2443 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2447 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2448 * value of this field is ignored. Note also that a value of zero
2449 * indicates the current setting should be left unchanged.
2451 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2454 msecs_to_jiffies(params->spp_sackdelay);
2457 msecs_to_jiffies(params->spp_sackdelay);
2459 sp->sackdelay = params->spp_sackdelay;
2463 if (sackdelay_change) {
2465 trans->param_flags =
2466 (trans->param_flags & ~SPP_SACKDELAY) |
2470 (asoc->param_flags & ~SPP_SACKDELAY) |
2474 (sp->param_flags & ~SPP_SACKDELAY) |
2479 /* Note that a value of zero indicates the current setting should be
2482 if (params->spp_pathmaxrxt) {
2484 trans->pathmaxrxt = params->spp_pathmaxrxt;
2486 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2488 sp->pathmaxrxt = params->spp_pathmaxrxt;
2495 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2496 char __user *optval,
2497 unsigned int optlen)
2499 struct sctp_paddrparams params;
2500 struct sctp_transport *trans = NULL;
2501 struct sctp_association *asoc = NULL;
2502 struct sctp_sock *sp = sctp_sk(sk);
2504 int hb_change, pmtud_change, sackdelay_change;
2506 if (optlen != sizeof(struct sctp_paddrparams))
2509 if (copy_from_user(¶ms, optval, optlen))
2512 /* Validate flags and value parameters. */
2513 hb_change = params.spp_flags & SPP_HB;
2514 pmtud_change = params.spp_flags & SPP_PMTUD;
2515 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2517 if (hb_change == SPP_HB ||
2518 pmtud_change == SPP_PMTUD ||
2519 sackdelay_change == SPP_SACKDELAY ||
2520 params.spp_sackdelay > 500 ||
2521 (params.spp_pathmtu &&
2522 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2525 /* If an address other than INADDR_ANY is specified, and
2526 * no transport is found, then the request is invalid.
2528 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2529 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2530 params.spp_assoc_id);
2535 /* Get association, if assoc_id != 0 and the socket is a one
2536 * to many style socket, and an association was not found, then
2537 * the id was invalid.
2539 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2540 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2543 /* Heartbeat demand can only be sent on a transport or
2544 * association, but not a socket.
2546 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2549 /* Process parameters. */
2550 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2551 hb_change, pmtud_change,
2557 /* If changes are for association, also apply parameters to each
2560 if (!trans && asoc) {
2561 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2563 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2564 hb_change, pmtud_change,
2572 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2574 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2577 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2579 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2583 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2585 * This option will effect the way delayed acks are performed. This
2586 * option allows you to get or set the delayed ack time, in
2587 * milliseconds. It also allows changing the delayed ack frequency.
2588 * Changing the frequency to 1 disables the delayed sack algorithm. If
2589 * the assoc_id is 0, then this sets or gets the endpoints default
2590 * values. If the assoc_id field is non-zero, then the set or get
2591 * effects the specified association for the one to many model (the
2592 * assoc_id field is ignored by the one to one model). Note that if
2593 * sack_delay or sack_freq are 0 when setting this option, then the
2594 * current values will remain unchanged.
2596 * struct sctp_sack_info {
2597 * sctp_assoc_t sack_assoc_id;
2598 * uint32_t sack_delay;
2599 * uint32_t sack_freq;
2602 * sack_assoc_id - This parameter, indicates which association the user
2603 * is performing an action upon. Note that if this field's value is
2604 * zero then the endpoints default value is changed (effecting future
2605 * associations only).
2607 * sack_delay - This parameter contains the number of milliseconds that
2608 * the user is requesting the delayed ACK timer be set to. Note that
2609 * this value is defined in the standard to be between 200 and 500
2612 * sack_freq - This parameter contains the number of packets that must
2613 * be received before a sack is sent without waiting for the delay
2614 * timer to expire. The default value for this is 2, setting this
2615 * value to 1 will disable the delayed sack algorithm.
2618 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2619 char __user *optval, unsigned int optlen)
2621 struct sctp_sack_info params;
2622 struct sctp_transport *trans = NULL;
2623 struct sctp_association *asoc = NULL;
2624 struct sctp_sock *sp = sctp_sk(sk);
2626 if (optlen == sizeof(struct sctp_sack_info)) {
2627 if (copy_from_user(¶ms, optval, optlen))
2630 if (params.sack_delay == 0 && params.sack_freq == 0)
2632 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2633 pr_warn_ratelimited(DEPRECATED
2635 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2636 "Use struct sctp_sack_info instead\n",
2637 current->comm, task_pid_nr(current));
2638 if (copy_from_user(¶ms, optval, optlen))
2641 if (params.sack_delay == 0)
2642 params.sack_freq = 1;
2644 params.sack_freq = 0;
2648 /* Validate value parameter. */
2649 if (params.sack_delay > 500)
2652 /* Get association, if sack_assoc_id != 0 and the socket is a one
2653 * to many style socket, and an association was not found, then
2654 * the id was invalid.
2656 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2657 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2660 if (params.sack_delay) {
2663 msecs_to_jiffies(params.sack_delay);
2665 sctp_spp_sackdelay_enable(asoc->param_flags);
2667 sp->sackdelay = params.sack_delay;
2669 sctp_spp_sackdelay_enable(sp->param_flags);
2673 if (params.sack_freq == 1) {
2676 sctp_spp_sackdelay_disable(asoc->param_flags);
2679 sctp_spp_sackdelay_disable(sp->param_flags);
2681 } else if (params.sack_freq > 1) {
2683 asoc->sackfreq = params.sack_freq;
2685 sctp_spp_sackdelay_enable(asoc->param_flags);
2687 sp->sackfreq = params.sack_freq;
2689 sctp_spp_sackdelay_enable(sp->param_flags);
2693 /* If change is for association, also apply to each transport. */
2695 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2697 if (params.sack_delay) {
2699 msecs_to_jiffies(params.sack_delay);
2700 trans->param_flags =
2701 sctp_spp_sackdelay_enable(trans->param_flags);
2703 if (params.sack_freq == 1) {
2704 trans->param_flags =
2705 sctp_spp_sackdelay_disable(trans->param_flags);
2706 } else if (params.sack_freq > 1) {
2707 trans->sackfreq = params.sack_freq;
2708 trans->param_flags =
2709 sctp_spp_sackdelay_enable(trans->param_flags);
2717 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2719 * Applications can specify protocol parameters for the default association
2720 * initialization. The option name argument to setsockopt() and getsockopt()
2723 * Setting initialization parameters is effective only on an unconnected
2724 * socket (for UDP-style sockets only future associations are effected
2725 * by the change). With TCP-style sockets, this option is inherited by
2726 * sockets derived from a listener socket.
2728 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2730 struct sctp_initmsg sinit;
2731 struct sctp_sock *sp = sctp_sk(sk);
2733 if (optlen != sizeof(struct sctp_initmsg))
2735 if (copy_from_user(&sinit, optval, optlen))
2738 if (sinit.sinit_num_ostreams)
2739 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2740 if (sinit.sinit_max_instreams)
2741 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2742 if (sinit.sinit_max_attempts)
2743 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2744 if (sinit.sinit_max_init_timeo)
2745 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2751 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2753 * Applications that wish to use the sendto() system call may wish to
2754 * specify a default set of parameters that would normally be supplied
2755 * through the inclusion of ancillary data. This socket option allows
2756 * such an application to set the default sctp_sndrcvinfo structure.
2757 * The application that wishes to use this socket option simply passes
2758 * in to this call the sctp_sndrcvinfo structure defined in Section
2759 * 5.2.2) The input parameters accepted by this call include
2760 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2761 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2762 * to this call if the caller is using the UDP model.
2764 static int sctp_setsockopt_default_send_param(struct sock *sk,
2765 char __user *optval,
2766 unsigned int optlen)
2768 struct sctp_sock *sp = sctp_sk(sk);
2769 struct sctp_association *asoc;
2770 struct sctp_sndrcvinfo info;
2772 if (optlen != sizeof(info))
2774 if (copy_from_user(&info, optval, optlen))
2776 if (info.sinfo_flags &
2777 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2778 SCTP_ABORT | SCTP_EOF))
2781 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2782 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2785 asoc->default_stream = info.sinfo_stream;
2786 asoc->default_flags = info.sinfo_flags;
2787 asoc->default_ppid = info.sinfo_ppid;
2788 asoc->default_context = info.sinfo_context;
2789 asoc->default_timetolive = info.sinfo_timetolive;
2791 sp->default_stream = info.sinfo_stream;
2792 sp->default_flags = info.sinfo_flags;
2793 sp->default_ppid = info.sinfo_ppid;
2794 sp->default_context = info.sinfo_context;
2795 sp->default_timetolive = info.sinfo_timetolive;
2801 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2802 * (SCTP_DEFAULT_SNDINFO)
2804 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2805 char __user *optval,
2806 unsigned int optlen)
2808 struct sctp_sock *sp = sctp_sk(sk);
2809 struct sctp_association *asoc;
2810 struct sctp_sndinfo info;
2812 if (optlen != sizeof(info))
2814 if (copy_from_user(&info, optval, optlen))
2816 if (info.snd_flags &
2817 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2818 SCTP_ABORT | SCTP_EOF))
2821 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2822 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2825 asoc->default_stream = info.snd_sid;
2826 asoc->default_flags = info.snd_flags;
2827 asoc->default_ppid = info.snd_ppid;
2828 asoc->default_context = info.snd_context;
2830 sp->default_stream = info.snd_sid;
2831 sp->default_flags = info.snd_flags;
2832 sp->default_ppid = info.snd_ppid;
2833 sp->default_context = info.snd_context;
2839 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2841 * Requests that the local SCTP stack use the enclosed peer address as
2842 * the association primary. The enclosed address must be one of the
2843 * association peer's addresses.
2845 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2846 unsigned int optlen)
2848 struct sctp_prim prim;
2849 struct sctp_transport *trans;
2851 if (optlen != sizeof(struct sctp_prim))
2854 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2857 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2861 sctp_assoc_set_primary(trans->asoc, trans);
2867 * 7.1.5 SCTP_NODELAY
2869 * Turn on/off any Nagle-like algorithm. This means that packets are
2870 * generally sent as soon as possible and no unnecessary delays are
2871 * introduced, at the cost of more packets in the network. Expects an
2872 * integer boolean flag.
2874 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2875 unsigned int optlen)
2879 if (optlen < sizeof(int))
2881 if (get_user(val, (int __user *)optval))
2884 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2890 * 7.1.1 SCTP_RTOINFO
2892 * The protocol parameters used to initialize and bound retransmission
2893 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2894 * and modify these parameters.
2895 * All parameters are time values, in milliseconds. A value of 0, when
2896 * modifying the parameters, indicates that the current value should not
2900 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2902 struct sctp_rtoinfo rtoinfo;
2903 struct sctp_association *asoc;
2904 unsigned long rto_min, rto_max;
2905 struct sctp_sock *sp = sctp_sk(sk);
2907 if (optlen != sizeof (struct sctp_rtoinfo))
2910 if (copy_from_user(&rtoinfo, optval, optlen))
2913 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2915 /* Set the values to the specific association */
2916 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2919 rto_max = rtoinfo.srto_max;
2920 rto_min = rtoinfo.srto_min;
2923 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2925 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2928 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2930 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2932 if (rto_min > rto_max)
2936 if (rtoinfo.srto_initial != 0)
2938 msecs_to_jiffies(rtoinfo.srto_initial);
2939 asoc->rto_max = rto_max;
2940 asoc->rto_min = rto_min;
2942 /* If there is no association or the association-id = 0
2943 * set the values to the endpoint.
2945 if (rtoinfo.srto_initial != 0)
2946 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2947 sp->rtoinfo.srto_max = rto_max;
2948 sp->rtoinfo.srto_min = rto_min;
2956 * 7.1.2 SCTP_ASSOCINFO
2958 * This option is used to tune the maximum retransmission attempts
2959 * of the association.
2960 * Returns an error if the new association retransmission value is
2961 * greater than the sum of the retransmission value of the peer.
2962 * See [SCTP] for more information.
2965 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2968 struct sctp_assocparams assocparams;
2969 struct sctp_association *asoc;
2971 if (optlen != sizeof(struct sctp_assocparams))
2973 if (copy_from_user(&assocparams, optval, optlen))
2976 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2978 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2981 /* Set the values to the specific association */
2983 if (assocparams.sasoc_asocmaxrxt != 0) {
2986 struct sctp_transport *peer_addr;
2988 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2990 path_sum += peer_addr->pathmaxrxt;
2994 /* Only validate asocmaxrxt if we have more than
2995 * one path/transport. We do this because path
2996 * retransmissions are only counted when we have more
3000 assocparams.sasoc_asocmaxrxt > path_sum)
3003 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3006 if (assocparams.sasoc_cookie_life != 0)
3007 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3009 /* Set the values to the endpoint */
3010 struct sctp_sock *sp = sctp_sk(sk);
3012 if (assocparams.sasoc_asocmaxrxt != 0)
3013 sp->assocparams.sasoc_asocmaxrxt =
3014 assocparams.sasoc_asocmaxrxt;
3015 if (assocparams.sasoc_cookie_life != 0)
3016 sp->assocparams.sasoc_cookie_life =
3017 assocparams.sasoc_cookie_life;
3023 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3025 * This socket option is a boolean flag which turns on or off mapped V4
3026 * addresses. If this option is turned on and the socket is type
3027 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3028 * If this option is turned off, then no mapping will be done of V4
3029 * addresses and a user will receive both PF_INET6 and PF_INET type
3030 * addresses on the socket.
3032 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3035 struct sctp_sock *sp = sctp_sk(sk);
3037 if (optlen < sizeof(int))
3039 if (get_user(val, (int __user *)optval))
3050 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3051 * This option will get or set the maximum size to put in any outgoing
3052 * SCTP DATA chunk. If a message is larger than this size it will be
3053 * fragmented by SCTP into the specified size. Note that the underlying
3054 * SCTP implementation may fragment into smaller sized chunks when the
3055 * PMTU of the underlying association is smaller than the value set by
3056 * the user. The default value for this option is '0' which indicates
3057 * the user is NOT limiting fragmentation and only the PMTU will effect
3058 * SCTP's choice of DATA chunk size. Note also that values set larger
3059 * than the maximum size of an IP datagram will effectively let SCTP
3060 * control fragmentation (i.e. the same as setting this option to 0).
3062 * The following structure is used to access and modify this parameter:
3064 * struct sctp_assoc_value {
3065 * sctp_assoc_t assoc_id;
3066 * uint32_t assoc_value;
3069 * assoc_id: This parameter is ignored for one-to-one style sockets.
3070 * For one-to-many style sockets this parameter indicates which
3071 * association the user is performing an action upon. Note that if
3072 * this field's value is zero then the endpoints default value is
3073 * changed (effecting future associations only).
3074 * assoc_value: This parameter specifies the maximum size in bytes.
3076 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3078 struct sctp_assoc_value params;
3079 struct sctp_association *asoc;
3080 struct sctp_sock *sp = sctp_sk(sk);
3083 if (optlen == sizeof(int)) {
3084 pr_warn_ratelimited(DEPRECATED
3086 "Use of int in maxseg socket option.\n"
3087 "Use struct sctp_assoc_value instead\n",
3088 current->comm, task_pid_nr(current));
3089 if (copy_from_user(&val, optval, optlen))
3091 params.assoc_id = 0;
3092 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3093 if (copy_from_user(¶ms, optval, optlen))
3095 val = params.assoc_value;
3099 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3102 asoc = sctp_id2assoc(sk, params.assoc_id);
3103 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3108 val = asoc->pathmtu;
3109 val -= sp->pf->af->net_header_len;
3110 val -= sizeof(struct sctphdr) +
3111 sizeof(struct sctp_data_chunk);
3113 asoc->user_frag = val;
3114 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3116 sp->user_frag = val;
3124 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3126 * Requests that the peer mark the enclosed address as the association
3127 * primary. The enclosed address must be one of the association's
3128 * locally bound addresses. The following structure is used to make a
3129 * set primary request:
3131 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3132 unsigned int optlen)
3134 struct net *net = sock_net(sk);
3135 struct sctp_sock *sp;
3136 struct sctp_association *asoc = NULL;
3137 struct sctp_setpeerprim prim;
3138 struct sctp_chunk *chunk;
3144 if (!net->sctp.addip_enable)
3147 if (optlen != sizeof(struct sctp_setpeerprim))
3150 if (copy_from_user(&prim, optval, optlen))
3153 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3157 if (!asoc->peer.asconf_capable)
3160 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3163 if (!sctp_state(asoc, ESTABLISHED))
3166 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3170 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3171 return -EADDRNOTAVAIL;
3173 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3174 return -EADDRNOTAVAIL;
3176 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3177 chunk = sctp_make_asconf_set_prim(asoc,
3178 (union sctp_addr *)&prim.sspp_addr);
3182 err = sctp_send_asconf(asoc, chunk);
3184 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3189 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3190 unsigned int optlen)
3192 struct sctp_setadaptation adaptation;
3194 if (optlen != sizeof(struct sctp_setadaptation))
3196 if (copy_from_user(&adaptation, optval, optlen))
3199 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3205 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3207 * The context field in the sctp_sndrcvinfo structure is normally only
3208 * used when a failed message is retrieved holding the value that was
3209 * sent down on the actual send call. This option allows the setting of
3210 * a default context on an association basis that will be received on
3211 * reading messages from the peer. This is especially helpful in the
3212 * one-2-many model for an application to keep some reference to an
3213 * internal state machine that is processing messages on the
3214 * association. Note that the setting of this value only effects
3215 * received messages from the peer and does not effect the value that is
3216 * saved with outbound messages.
3218 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3219 unsigned int optlen)
3221 struct sctp_assoc_value params;
3222 struct sctp_sock *sp;
3223 struct sctp_association *asoc;
3225 if (optlen != sizeof(struct sctp_assoc_value))
3227 if (copy_from_user(¶ms, optval, optlen))
3232 if (params.assoc_id != 0) {
3233 asoc = sctp_id2assoc(sk, params.assoc_id);
3236 asoc->default_rcv_context = params.assoc_value;
3238 sp->default_rcv_context = params.assoc_value;
3245 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3247 * This options will at a minimum specify if the implementation is doing
3248 * fragmented interleave. Fragmented interleave, for a one to many
3249 * socket, is when subsequent calls to receive a message may return
3250 * parts of messages from different associations. Some implementations
3251 * may allow you to turn this value on or off. If so, when turned off,
3252 * no fragment interleave will occur (which will cause a head of line
3253 * blocking amongst multiple associations sharing the same one to many
3254 * socket). When this option is turned on, then each receive call may
3255 * come from a different association (thus the user must receive data
3256 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3257 * association each receive belongs to.
3259 * This option takes a boolean value. A non-zero value indicates that
3260 * fragmented interleave is on. A value of zero indicates that
3261 * fragmented interleave is off.
3263 * Note that it is important that an implementation that allows this
3264 * option to be turned on, have it off by default. Otherwise an unaware
3265 * application using the one to many model may become confused and act
3268 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3269 char __user *optval,
3270 unsigned int optlen)
3274 if (optlen != sizeof(int))
3276 if (get_user(val, (int __user *)optval))
3279 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3285 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3286 * (SCTP_PARTIAL_DELIVERY_POINT)
3288 * This option will set or get the SCTP partial delivery point. This
3289 * point is the size of a message where the partial delivery API will be
3290 * invoked to help free up rwnd space for the peer. Setting this to a
3291 * lower value will cause partial deliveries to happen more often. The
3292 * calls argument is an integer that sets or gets the partial delivery
3293 * point. Note also that the call will fail if the user attempts to set
3294 * this value larger than the socket receive buffer size.
3296 * Note that any single message having a length smaller than or equal to
3297 * the SCTP partial delivery point will be delivered in one single read
3298 * call as long as the user provided buffer is large enough to hold the
3301 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3302 char __user *optval,
3303 unsigned int optlen)
3307 if (optlen != sizeof(u32))
3309 if (get_user(val, (int __user *)optval))
3312 /* Note: We double the receive buffer from what the user sets
3313 * it to be, also initial rwnd is based on rcvbuf/2.
3315 if (val > (sk->sk_rcvbuf >> 1))
3318 sctp_sk(sk)->pd_point = val;
3320 return 0; /* is this the right error code? */
3324 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3326 * This option will allow a user to change the maximum burst of packets
3327 * that can be emitted by this association. Note that the default value
3328 * is 4, and some implementations may restrict this setting so that it
3329 * can only be lowered.
3331 * NOTE: This text doesn't seem right. Do this on a socket basis with
3332 * future associations inheriting the socket value.
3334 static int sctp_setsockopt_maxburst(struct sock *sk,
3335 char __user *optval,
3336 unsigned int optlen)
3338 struct sctp_assoc_value params;
3339 struct sctp_sock *sp;
3340 struct sctp_association *asoc;
3344 if (optlen == sizeof(int)) {
3345 pr_warn_ratelimited(DEPRECATED
3347 "Use of int in max_burst socket option deprecated.\n"
3348 "Use struct sctp_assoc_value instead\n",
3349 current->comm, task_pid_nr(current));
3350 if (copy_from_user(&val, optval, optlen))
3352 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3353 if (copy_from_user(¶ms, optval, optlen))
3355 val = params.assoc_value;
3356 assoc_id = params.assoc_id;
3362 if (assoc_id != 0) {
3363 asoc = sctp_id2assoc(sk, assoc_id);
3366 asoc->max_burst = val;
3368 sp->max_burst = val;
3374 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3376 * This set option adds a chunk type that the user is requesting to be
3377 * received only in an authenticated way. Changes to the list of chunks
3378 * will only effect future associations on the socket.
3380 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3381 char __user *optval,
3382 unsigned int optlen)
3384 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3385 struct sctp_authchunk val;
3387 if (!ep->auth_enable)
3390 if (optlen != sizeof(struct sctp_authchunk))
3392 if (copy_from_user(&val, optval, optlen))
3395 switch (val.sauth_chunk) {
3397 case SCTP_CID_INIT_ACK:
3398 case SCTP_CID_SHUTDOWN_COMPLETE:
3403 /* add this chunk id to the endpoint */
3404 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3408 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3410 * This option gets or sets the list of HMAC algorithms that the local
3411 * endpoint requires the peer to use.
3413 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3414 char __user *optval,
3415 unsigned int optlen)
3417 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3418 struct sctp_hmacalgo *hmacs;
3422 if (!ep->auth_enable)
3425 if (optlen < sizeof(struct sctp_hmacalgo))
3428 hmacs = memdup_user(optval, optlen);
3430 return PTR_ERR(hmacs);
3432 idents = hmacs->shmac_num_idents;
3433 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3434 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3439 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3446 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3448 * This option will set a shared secret key which is used to build an
3449 * association shared key.
3451 static int sctp_setsockopt_auth_key(struct sock *sk,
3452 char __user *optval,
3453 unsigned int optlen)
3455 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3456 struct sctp_authkey *authkey;
3457 struct sctp_association *asoc;
3460 if (!ep->auth_enable)
3463 if (optlen <= sizeof(struct sctp_authkey))
3466 authkey = memdup_user(optval, optlen);
3467 if (IS_ERR(authkey))
3468 return PTR_ERR(authkey);
3470 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3475 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3476 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3481 ret = sctp_auth_set_key(ep, asoc, authkey);
3488 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3490 * This option will get or set the active shared key to be used to build
3491 * the association shared key.
3493 static int sctp_setsockopt_active_key(struct sock *sk,
3494 char __user *optval,
3495 unsigned int optlen)
3497 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3498 struct sctp_authkeyid val;
3499 struct sctp_association *asoc;
3501 if (!ep->auth_enable)
3504 if (optlen != sizeof(struct sctp_authkeyid))
3506 if (copy_from_user(&val, optval, optlen))
3509 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3510 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3513 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3517 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3519 * This set option will delete a shared secret key from use.
3521 static int sctp_setsockopt_del_key(struct sock *sk,
3522 char __user *optval,
3523 unsigned int optlen)
3525 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3526 struct sctp_authkeyid val;
3527 struct sctp_association *asoc;
3529 if (!ep->auth_enable)
3532 if (optlen != sizeof(struct sctp_authkeyid))
3534 if (copy_from_user(&val, optval, optlen))
3537 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3538 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3541 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3546 * 8.1.23 SCTP_AUTO_ASCONF
3548 * This option will enable or disable the use of the automatic generation of
3549 * ASCONF chunks to add and delete addresses to an existing association. Note
3550 * that this option has two caveats namely: a) it only affects sockets that
3551 * are bound to all addresses available to the SCTP stack, and b) the system
3552 * administrator may have an overriding control that turns the ASCONF feature
3553 * off no matter what setting the socket option may have.
3554 * This option expects an integer boolean flag, where a non-zero value turns on
3555 * the option, and a zero value turns off the option.
3556 * Note. In this implementation, socket operation overrides default parameter
3557 * being set by sysctl as well as FreeBSD implementation
3559 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3560 unsigned int optlen)
3563 struct sctp_sock *sp = sctp_sk(sk);
3565 if (optlen < sizeof(int))
3567 if (get_user(val, (int __user *)optval))
3569 if (!sctp_is_ep_boundall(sk) && val)
3571 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3574 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3575 if (val == 0 && sp->do_auto_asconf) {
3576 list_del(&sp->auto_asconf_list);
3577 sp->do_auto_asconf = 0;
3578 } else if (val && !sp->do_auto_asconf) {
3579 list_add_tail(&sp->auto_asconf_list,
3580 &sock_net(sk)->sctp.auto_asconf_splist);
3581 sp->do_auto_asconf = 1;
3583 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3588 * SCTP_PEER_ADDR_THLDS
3590 * This option allows us to alter the partially failed threshold for one or all
3591 * transports in an association. See Section 6.1 of:
3592 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3594 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3595 char __user *optval,
3596 unsigned int optlen)
3598 struct sctp_paddrthlds val;
3599 struct sctp_transport *trans;
3600 struct sctp_association *asoc;
3602 if (optlen < sizeof(struct sctp_paddrthlds))
3604 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3605 sizeof(struct sctp_paddrthlds)))
3609 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3610 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3613 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3615 if (val.spt_pathmaxrxt)
3616 trans->pathmaxrxt = val.spt_pathmaxrxt;
3617 trans->pf_retrans = val.spt_pathpfthld;
3620 if (val.spt_pathmaxrxt)
3621 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3622 asoc->pf_retrans = val.spt_pathpfthld;
3624 trans = sctp_addr_id2transport(sk, &val.spt_address,
3629 if (val.spt_pathmaxrxt)
3630 trans->pathmaxrxt = val.spt_pathmaxrxt;
3631 trans->pf_retrans = val.spt_pathpfthld;
3637 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3638 char __user *optval,
3639 unsigned int optlen)
3643 if (optlen < sizeof(int))
3645 if (get_user(val, (int __user *) optval))
3648 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3653 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3654 char __user *optval,
3655 unsigned int optlen)
3659 if (optlen < sizeof(int))
3661 if (get_user(val, (int __user *) optval))
3664 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3669 /* API 6.2 setsockopt(), getsockopt()
3671 * Applications use setsockopt() and getsockopt() to set or retrieve
3672 * socket options. Socket options are used to change the default
3673 * behavior of sockets calls. They are described in Section 7.
3677 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3678 * int __user *optlen);
3679 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3682 * sd - the socket descript.
3683 * level - set to IPPROTO_SCTP for all SCTP options.
3684 * optname - the option name.
3685 * optval - the buffer to store the value of the option.
3686 * optlen - the size of the buffer.
3688 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3689 char __user *optval, unsigned int optlen)
3693 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3695 /* I can hardly begin to describe how wrong this is. This is
3696 * so broken as to be worse than useless. The API draft
3697 * REALLY is NOT helpful here... I am not convinced that the
3698 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3699 * are at all well-founded.
3701 if (level != SOL_SCTP) {
3702 struct sctp_af *af = sctp_sk(sk)->pf->af;
3703 retval = af->setsockopt(sk, level, optname, optval, optlen);
3710 case SCTP_SOCKOPT_BINDX_ADD:
3711 /* 'optlen' is the size of the addresses buffer. */
3712 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3713 optlen, SCTP_BINDX_ADD_ADDR);
3716 case SCTP_SOCKOPT_BINDX_REM:
3717 /* 'optlen' is the size of the addresses buffer. */
3718 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3719 optlen, SCTP_BINDX_REM_ADDR);
3722 case SCTP_SOCKOPT_CONNECTX_OLD:
3723 /* 'optlen' is the size of the addresses buffer. */
3724 retval = sctp_setsockopt_connectx_old(sk,
3725 (struct sockaddr __user *)optval,
3729 case SCTP_SOCKOPT_CONNECTX:
3730 /* 'optlen' is the size of the addresses buffer. */
3731 retval = sctp_setsockopt_connectx(sk,
3732 (struct sockaddr __user *)optval,
3736 case SCTP_DISABLE_FRAGMENTS:
3737 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3741 retval = sctp_setsockopt_events(sk, optval, optlen);
3744 case SCTP_AUTOCLOSE:
3745 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3748 case SCTP_PEER_ADDR_PARAMS:
3749 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3752 case SCTP_DELAYED_SACK:
3753 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3755 case SCTP_PARTIAL_DELIVERY_POINT:
3756 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3760 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3762 case SCTP_DEFAULT_SEND_PARAM:
3763 retval = sctp_setsockopt_default_send_param(sk, optval,
3766 case SCTP_DEFAULT_SNDINFO:
3767 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3769 case SCTP_PRIMARY_ADDR:
3770 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3772 case SCTP_SET_PEER_PRIMARY_ADDR:
3773 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3776 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3779 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3781 case SCTP_ASSOCINFO:
3782 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3784 case SCTP_I_WANT_MAPPED_V4_ADDR:
3785 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3788 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3790 case SCTP_ADAPTATION_LAYER:
3791 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3794 retval = sctp_setsockopt_context(sk, optval, optlen);
3796 case SCTP_FRAGMENT_INTERLEAVE:
3797 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3799 case SCTP_MAX_BURST:
3800 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3802 case SCTP_AUTH_CHUNK:
3803 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3805 case SCTP_HMAC_IDENT:
3806 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3809 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3811 case SCTP_AUTH_ACTIVE_KEY:
3812 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3814 case SCTP_AUTH_DELETE_KEY:
3815 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3817 case SCTP_AUTO_ASCONF:
3818 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3820 case SCTP_PEER_ADDR_THLDS:
3821 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3823 case SCTP_RECVRCVINFO:
3824 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3826 case SCTP_RECVNXTINFO:
3827 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3830 retval = -ENOPROTOOPT;
3840 /* API 3.1.6 connect() - UDP Style Syntax
3842 * An application may use the connect() call in the UDP model to initiate an
3843 * association without sending data.
3847 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3849 * sd: the socket descriptor to have a new association added to.
3851 * nam: the address structure (either struct sockaddr_in or struct
3852 * sockaddr_in6 defined in RFC2553 [7]).
3854 * len: the size of the address.
3856 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3864 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3867 /* Validate addr_len before calling common connect/connectx routine. */
3868 af = sctp_get_af_specific(addr->sa_family);
3869 if (!af || addr_len < af->sockaddr_len) {
3872 /* Pass correct addr len to common routine (so it knows there
3873 * is only one address being passed.
3875 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3882 /* FIXME: Write comments. */
3883 static int sctp_disconnect(struct sock *sk, int flags)
3885 return -EOPNOTSUPP; /* STUB */
3888 /* 4.1.4 accept() - TCP Style Syntax
3890 * Applications use accept() call to remove an established SCTP
3891 * association from the accept queue of the endpoint. A new socket
3892 * descriptor will be returned from accept() to represent the newly
3893 * formed association.
3895 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3897 struct sctp_sock *sp;
3898 struct sctp_endpoint *ep;
3899 struct sock *newsk = NULL;
3900 struct sctp_association *asoc;
3909 if (!sctp_style(sk, TCP)) {
3910 error = -EOPNOTSUPP;
3914 if (!sctp_sstate(sk, LISTENING)) {
3919 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3921 error = sctp_wait_for_accept(sk, timeo);
3925 /* We treat the list of associations on the endpoint as the accept
3926 * queue and pick the first association on the list.
3928 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3930 newsk = sp->pf->create_accept_sk(sk, asoc);
3936 /* Populate the fields of the newsk from the oldsk and migrate the
3937 * asoc to the newsk.
3939 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3947 /* The SCTP ioctl handler. */
3948 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3955 * SEQPACKET-style sockets in LISTENING state are valid, for
3956 * SCTP, so only discard TCP-style sockets in LISTENING state.
3958 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3963 struct sk_buff *skb;
3964 unsigned int amount = 0;
3966 skb = skb_peek(&sk->sk_receive_queue);
3969 * We will only return the amount of this packet since
3970 * that is all that will be read.
3974 rc = put_user(amount, (int __user *)arg);
3986 /* This is the function which gets called during socket creation to
3987 * initialized the SCTP-specific portion of the sock.
3988 * The sock structure should already be zero-filled memory.
3990 static int sctp_init_sock(struct sock *sk)
3992 struct net *net = sock_net(sk);
3993 struct sctp_sock *sp;
3995 pr_debug("%s: sk:%p\n", __func__, sk);
3999 /* Initialize the SCTP per socket area. */
4000 switch (sk->sk_type) {
4001 case SOCK_SEQPACKET:
4002 sp->type = SCTP_SOCKET_UDP;
4005 sp->type = SCTP_SOCKET_TCP;
4008 return -ESOCKTNOSUPPORT;
4011 /* Initialize default send parameters. These parameters can be
4012 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4014 sp->default_stream = 0;
4015 sp->default_ppid = 0;
4016 sp->default_flags = 0;
4017 sp->default_context = 0;
4018 sp->default_timetolive = 0;
4020 sp->default_rcv_context = 0;
4021 sp->max_burst = net->sctp.max_burst;
4023 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4025 /* Initialize default setup parameters. These parameters
4026 * can be modified with the SCTP_INITMSG socket option or
4027 * overridden by the SCTP_INIT CMSG.
4029 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4030 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4031 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4032 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4034 /* Initialize default RTO related parameters. These parameters can
4035 * be modified for with the SCTP_RTOINFO socket option.
4037 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4038 sp->rtoinfo.srto_max = net->sctp.rto_max;
4039 sp->rtoinfo.srto_min = net->sctp.rto_min;
4041 /* Initialize default association related parameters. These parameters
4042 * can be modified with the SCTP_ASSOCINFO socket option.
4044 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4045 sp->assocparams.sasoc_number_peer_destinations = 0;
4046 sp->assocparams.sasoc_peer_rwnd = 0;
4047 sp->assocparams.sasoc_local_rwnd = 0;
4048 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4050 /* Initialize default event subscriptions. By default, all the
4053 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4055 /* Default Peer Address Parameters. These defaults can
4056 * be modified via SCTP_PEER_ADDR_PARAMS
4058 sp->hbinterval = net->sctp.hb_interval;
4059 sp->pathmaxrxt = net->sctp.max_retrans_path;
4060 sp->pathmtu = 0; /* allow default discovery */
4061 sp->sackdelay = net->sctp.sack_timeout;
4063 sp->param_flags = SPP_HB_ENABLE |
4065 SPP_SACKDELAY_ENABLE;
4067 /* If enabled no SCTP message fragmentation will be performed.
4068 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4070 sp->disable_fragments = 0;
4072 /* Enable Nagle algorithm by default. */
4075 sp->recvrcvinfo = 0;
4076 sp->recvnxtinfo = 0;
4078 /* Enable by default. */
4081 /* Auto-close idle associations after the configured
4082 * number of seconds. A value of 0 disables this
4083 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4084 * for UDP-style sockets only.
4088 /* User specified fragmentation limit. */
4091 sp->adaptation_ind = 0;
4093 sp->pf = sctp_get_pf_specific(sk->sk_family);
4095 /* Control variables for partial data delivery. */
4096 atomic_set(&sp->pd_mode, 0);
4097 skb_queue_head_init(&sp->pd_lobby);
4098 sp->frag_interleave = 0;
4100 /* Create a per socket endpoint structure. Even if we
4101 * change the data structure relationships, this may still
4102 * be useful for storing pre-connect address information.
4104 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4110 sk->sk_destruct = sctp_destruct_sock;
4112 SCTP_DBG_OBJCNT_INC(sock);
4115 percpu_counter_inc(&sctp_sockets_allocated);
4116 sock_prot_inuse_add(net, sk->sk_prot, 1);
4118 /* Nothing can fail after this block, otherwise
4119 * sctp_destroy_sock() will be called without addr_wq_lock held
4121 if (net->sctp.default_auto_asconf) {
4122 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4123 list_add_tail(&sp->auto_asconf_list,
4124 &net->sctp.auto_asconf_splist);
4125 sp->do_auto_asconf = 1;
4126 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4128 sp->do_auto_asconf = 0;
4136 /* Cleanup any SCTP per socket resources. Must be called with
4137 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4139 static void sctp_destroy_sock(struct sock *sk)
4141 struct sctp_sock *sp;
4143 pr_debug("%s: sk:%p\n", __func__, sk);
4145 /* Release our hold on the endpoint. */
4147 /* This could happen during socket init, thus we bail out
4148 * early, since the rest of the below is not setup either.
4153 if (sp->do_auto_asconf) {
4154 sp->do_auto_asconf = 0;
4155 list_del(&sp->auto_asconf_list);
4157 sctp_endpoint_free(sp->ep);
4159 percpu_counter_dec(&sctp_sockets_allocated);
4160 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4164 /* Triggered when there are no references on the socket anymore */
4165 static void sctp_destruct_sock(struct sock *sk)
4167 struct sctp_sock *sp = sctp_sk(sk);
4169 /* Free up the HMAC transform. */
4170 crypto_free_hash(sp->hmac);
4172 inet_sock_destruct(sk);
4175 /* API 4.1.7 shutdown() - TCP Style Syntax
4176 * int shutdown(int socket, int how);
4178 * sd - the socket descriptor of the association to be closed.
4179 * how - Specifies the type of shutdown. The values are
4182 * Disables further receive operations. No SCTP
4183 * protocol action is taken.
4185 * Disables further send operations, and initiates
4186 * the SCTP shutdown sequence.
4188 * Disables further send and receive operations
4189 * and initiates the SCTP shutdown sequence.
4191 static void sctp_shutdown(struct sock *sk, int how)
4193 struct net *net = sock_net(sk);
4194 struct sctp_endpoint *ep;
4195 struct sctp_association *asoc;
4197 if (!sctp_style(sk, TCP))
4200 if (how & SEND_SHUTDOWN) {
4201 ep = sctp_sk(sk)->ep;
4202 if (!list_empty(&ep->asocs)) {
4203 asoc = list_entry(ep->asocs.next,
4204 struct sctp_association, asocs);
4205 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4210 /* 7.2.1 Association Status (SCTP_STATUS)
4212 * Applications can retrieve current status information about an
4213 * association, including association state, peer receiver window size,
4214 * number of unacked data chunks, and number of data chunks pending
4215 * receipt. This information is read-only.
4217 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4218 char __user *optval,
4221 struct sctp_status status;
4222 struct sctp_association *asoc = NULL;
4223 struct sctp_transport *transport;
4224 sctp_assoc_t associd;
4227 if (len < sizeof(status)) {
4232 len = sizeof(status);
4233 if (copy_from_user(&status, optval, len)) {
4238 associd = status.sstat_assoc_id;
4239 asoc = sctp_id2assoc(sk, associd);
4245 transport = asoc->peer.primary_path;
4247 status.sstat_assoc_id = sctp_assoc2id(asoc);
4248 status.sstat_state = sctp_assoc_to_state(asoc);
4249 status.sstat_rwnd = asoc->peer.rwnd;
4250 status.sstat_unackdata = asoc->unack_data;
4252 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4253 status.sstat_instrms = asoc->c.sinit_max_instreams;
4254 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4255 status.sstat_fragmentation_point = asoc->frag_point;
4256 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4257 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4258 transport->af_specific->sockaddr_len);
4259 /* Map ipv4 address into v4-mapped-on-v6 address. */
4260 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4261 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4262 status.sstat_primary.spinfo_state = transport->state;
4263 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4264 status.sstat_primary.spinfo_srtt = transport->srtt;
4265 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4266 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4268 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4269 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4271 if (put_user(len, optlen)) {
4276 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4277 __func__, len, status.sstat_state, status.sstat_rwnd,
4278 status.sstat_assoc_id);
4280 if (copy_to_user(optval, &status, len)) {
4290 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4292 * Applications can retrieve information about a specific peer address
4293 * of an association, including its reachability state, congestion
4294 * window, and retransmission timer values. This information is
4297 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4298 char __user *optval,
4301 struct sctp_paddrinfo pinfo;
4302 struct sctp_transport *transport;
4305 if (len < sizeof(pinfo)) {
4310 len = sizeof(pinfo);
4311 if (copy_from_user(&pinfo, optval, len)) {
4316 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4317 pinfo.spinfo_assoc_id);
4321 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4322 pinfo.spinfo_state = transport->state;
4323 pinfo.spinfo_cwnd = transport->cwnd;
4324 pinfo.spinfo_srtt = transport->srtt;
4325 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4326 pinfo.spinfo_mtu = transport->pathmtu;
4328 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4329 pinfo.spinfo_state = SCTP_ACTIVE;
4331 if (put_user(len, optlen)) {
4336 if (copy_to_user(optval, &pinfo, len)) {
4345 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4347 * This option is a on/off flag. If enabled no SCTP message
4348 * fragmentation will be performed. Instead if a message being sent
4349 * exceeds the current PMTU size, the message will NOT be sent and
4350 * instead a error will be indicated to the user.
4352 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4353 char __user *optval, int __user *optlen)
4357 if (len < sizeof(int))
4361 val = (sctp_sk(sk)->disable_fragments == 1);
4362 if (put_user(len, optlen))
4364 if (copy_to_user(optval, &val, len))
4369 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4371 * This socket option is used to specify various notifications and
4372 * ancillary data the user wishes to receive.
4374 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4379 if (len > sizeof(struct sctp_event_subscribe))
4380 len = sizeof(struct sctp_event_subscribe);
4381 if (put_user(len, optlen))
4383 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4388 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4390 * This socket option is applicable to the UDP-style socket only. When
4391 * set it will cause associations that are idle for more than the
4392 * specified number of seconds to automatically close. An association
4393 * being idle is defined an association that has NOT sent or received
4394 * user data. The special value of '0' indicates that no automatic
4395 * close of any associations should be performed. The option expects an
4396 * integer defining the number of seconds of idle time before an
4397 * association is closed.
4399 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4401 /* Applicable to UDP-style socket only */
4402 if (sctp_style(sk, TCP))
4404 if (len < sizeof(int))
4407 if (put_user(len, optlen))
4409 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4414 /* Helper routine to branch off an association to a new socket. */
4415 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4417 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4418 struct sctp_sock *sp = sctp_sk(sk);
4419 struct socket *sock;
4425 /* An association cannot be branched off from an already peeled-off
4426 * socket, nor is this supported for tcp style sockets.
4428 if (!sctp_style(sk, UDP))
4431 /* Create a new socket. */
4432 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4436 sctp_copy_sock(sock->sk, sk, asoc);
4438 /* Make peeled-off sockets more like 1-1 accepted sockets.
4439 * Set the daddr and initialize id to something more random
4441 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4443 /* Populate the fields of the newsk from the oldsk and migrate the
4444 * asoc to the newsk.
4446 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4452 EXPORT_SYMBOL(sctp_do_peeloff);
4454 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4456 sctp_peeloff_arg_t peeloff;
4457 struct socket *newsock;
4458 struct file *newfile;
4461 if (len < sizeof(sctp_peeloff_arg_t))
4463 len = sizeof(sctp_peeloff_arg_t);
4464 if (copy_from_user(&peeloff, optval, len))
4467 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4471 /* Map the socket to an unused fd that can be returned to the user. */
4472 retval = get_unused_fd_flags(0);
4474 sock_release(newsock);
4478 newfile = sock_alloc_file(newsock, 0, NULL);
4479 if (IS_ERR(newfile)) {
4480 put_unused_fd(retval);
4481 sock_release(newsock);
4482 return PTR_ERR(newfile);
4485 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4488 /* Return the fd mapped to the new socket. */
4489 if (put_user(len, optlen)) {
4491 put_unused_fd(retval);
4494 peeloff.sd = retval;
4495 if (copy_to_user(optval, &peeloff, len)) {
4497 put_unused_fd(retval);
4500 fd_install(retval, newfile);
4505 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4507 * Applications can enable or disable heartbeats for any peer address of
4508 * an association, modify an address's heartbeat interval, force a
4509 * heartbeat to be sent immediately, and adjust the address's maximum
4510 * number of retransmissions sent before an address is considered
4511 * unreachable. The following structure is used to access and modify an
4512 * address's parameters:
4514 * struct sctp_paddrparams {
4515 * sctp_assoc_t spp_assoc_id;
4516 * struct sockaddr_storage spp_address;
4517 * uint32_t spp_hbinterval;
4518 * uint16_t spp_pathmaxrxt;
4519 * uint32_t spp_pathmtu;
4520 * uint32_t spp_sackdelay;
4521 * uint32_t spp_flags;
4524 * spp_assoc_id - (one-to-many style socket) This is filled in the
4525 * application, and identifies the association for
4527 * spp_address - This specifies which address is of interest.
4528 * spp_hbinterval - This contains the value of the heartbeat interval,
4529 * in milliseconds. If a value of zero
4530 * is present in this field then no changes are to
4531 * be made to this parameter.
4532 * spp_pathmaxrxt - This contains the maximum number of
4533 * retransmissions before this address shall be
4534 * considered unreachable. If a value of zero
4535 * is present in this field then no changes are to
4536 * be made to this parameter.
4537 * spp_pathmtu - When Path MTU discovery is disabled the value
4538 * specified here will be the "fixed" path mtu.
4539 * Note that if the spp_address field is empty
4540 * then all associations on this address will
4541 * have this fixed path mtu set upon them.
4543 * spp_sackdelay - When delayed sack is enabled, this value specifies
4544 * the number of milliseconds that sacks will be delayed
4545 * for. This value will apply to all addresses of an
4546 * association if the spp_address field is empty. Note
4547 * also, that if delayed sack is enabled and this
4548 * value is set to 0, no change is made to the last
4549 * recorded delayed sack timer value.
4551 * spp_flags - These flags are used to control various features
4552 * on an association. The flag field may contain
4553 * zero or more of the following options.
4555 * SPP_HB_ENABLE - Enable heartbeats on the
4556 * specified address. Note that if the address
4557 * field is empty all addresses for the association
4558 * have heartbeats enabled upon them.
4560 * SPP_HB_DISABLE - Disable heartbeats on the
4561 * speicifed address. Note that if the address
4562 * field is empty all addresses for the association
4563 * will have their heartbeats disabled. Note also
4564 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4565 * mutually exclusive, only one of these two should
4566 * be specified. Enabling both fields will have
4567 * undetermined results.
4569 * SPP_HB_DEMAND - Request a user initiated heartbeat
4570 * to be made immediately.
4572 * SPP_PMTUD_ENABLE - This field will enable PMTU
4573 * discovery upon the specified address. Note that
4574 * if the address feild is empty then all addresses
4575 * on the association are effected.
4577 * SPP_PMTUD_DISABLE - This field will disable 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. Not also that
4581 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4582 * exclusive. Enabling both will have undetermined
4585 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4586 * on delayed sack. The time specified in spp_sackdelay
4587 * is used to specify the sack delay for this address. Note
4588 * that if spp_address is empty then all addresses will
4589 * enable delayed sack and take on the sack delay
4590 * value specified in spp_sackdelay.
4591 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4592 * off delayed sack. If the spp_address field is blank then
4593 * delayed sack is disabled for the entire association. Note
4594 * also that this field is mutually exclusive to
4595 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4598 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4599 char __user *optval, int __user *optlen)
4601 struct sctp_paddrparams params;
4602 struct sctp_transport *trans = NULL;
4603 struct sctp_association *asoc = NULL;
4604 struct sctp_sock *sp = sctp_sk(sk);
4606 if (len < sizeof(struct sctp_paddrparams))
4608 len = sizeof(struct sctp_paddrparams);
4609 if (copy_from_user(¶ms, optval, len))
4612 /* If an address other than INADDR_ANY is specified, and
4613 * no transport is found, then the request is invalid.
4615 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4616 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4617 params.spp_assoc_id);
4619 pr_debug("%s: failed no transport\n", __func__);
4624 /* Get association, if assoc_id != 0 and the socket is a one
4625 * to many style socket, and an association was not found, then
4626 * the id was invalid.
4628 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4629 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4630 pr_debug("%s: failed no association\n", __func__);
4635 /* Fetch transport values. */
4636 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4637 params.spp_pathmtu = trans->pathmtu;
4638 params.spp_pathmaxrxt = trans->pathmaxrxt;
4639 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4641 /*draft-11 doesn't say what to return in spp_flags*/
4642 params.spp_flags = trans->param_flags;
4644 /* Fetch association values. */
4645 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4646 params.spp_pathmtu = asoc->pathmtu;
4647 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4648 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4650 /*draft-11 doesn't say what to return in spp_flags*/
4651 params.spp_flags = asoc->param_flags;
4653 /* Fetch socket values. */
4654 params.spp_hbinterval = sp->hbinterval;
4655 params.spp_pathmtu = sp->pathmtu;
4656 params.spp_sackdelay = sp->sackdelay;
4657 params.spp_pathmaxrxt = sp->pathmaxrxt;
4659 /*draft-11 doesn't say what to return in spp_flags*/
4660 params.spp_flags = sp->param_flags;
4663 if (copy_to_user(optval, ¶ms, len))
4666 if (put_user(len, optlen))
4673 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4675 * This option will effect the way delayed acks are performed. This
4676 * option allows you to get or set the delayed ack time, in
4677 * milliseconds. It also allows changing the delayed ack frequency.
4678 * Changing the frequency to 1 disables the delayed sack algorithm. If
4679 * the assoc_id is 0, then this sets or gets the endpoints default
4680 * values. If the assoc_id field is non-zero, then the set or get
4681 * effects the specified association for the one to many model (the
4682 * assoc_id field is ignored by the one to one model). Note that if
4683 * sack_delay or sack_freq are 0 when setting this option, then the
4684 * current values will remain unchanged.
4686 * struct sctp_sack_info {
4687 * sctp_assoc_t sack_assoc_id;
4688 * uint32_t sack_delay;
4689 * uint32_t sack_freq;
4692 * sack_assoc_id - This parameter, indicates which association the user
4693 * is performing an action upon. Note that if this field's value is
4694 * zero then the endpoints default value is changed (effecting future
4695 * associations only).
4697 * sack_delay - This parameter contains the number of milliseconds that
4698 * the user is requesting the delayed ACK timer be set to. Note that
4699 * this value is defined in the standard to be between 200 and 500
4702 * sack_freq - This parameter contains the number of packets that must
4703 * be received before a sack is sent without waiting for the delay
4704 * timer to expire. The default value for this is 2, setting this
4705 * value to 1 will disable the delayed sack algorithm.
4707 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4708 char __user *optval,
4711 struct sctp_sack_info params;
4712 struct sctp_association *asoc = NULL;
4713 struct sctp_sock *sp = sctp_sk(sk);
4715 if (len >= sizeof(struct sctp_sack_info)) {
4716 len = sizeof(struct sctp_sack_info);
4718 if (copy_from_user(¶ms, optval, len))
4720 } else if (len == sizeof(struct sctp_assoc_value)) {
4721 pr_warn_ratelimited(DEPRECATED
4723 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4724 "Use struct sctp_sack_info instead\n",
4725 current->comm, task_pid_nr(current));
4726 if (copy_from_user(¶ms, optval, len))
4731 /* Get association, if sack_assoc_id != 0 and the socket is a one
4732 * to many style socket, and an association was not found, then
4733 * the id was invalid.
4735 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4736 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4740 /* Fetch association values. */
4741 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4742 params.sack_delay = jiffies_to_msecs(
4744 params.sack_freq = asoc->sackfreq;
4747 params.sack_delay = 0;
4748 params.sack_freq = 1;
4751 /* Fetch socket values. */
4752 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4753 params.sack_delay = sp->sackdelay;
4754 params.sack_freq = sp->sackfreq;
4756 params.sack_delay = 0;
4757 params.sack_freq = 1;
4761 if (copy_to_user(optval, ¶ms, len))
4764 if (put_user(len, optlen))
4770 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4772 * Applications can specify protocol parameters for the default association
4773 * initialization. The option name argument to setsockopt() and getsockopt()
4776 * Setting initialization parameters is effective only on an unconnected
4777 * socket (for UDP-style sockets only future associations are effected
4778 * by the change). With TCP-style sockets, this option is inherited by
4779 * sockets derived from a listener socket.
4781 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4783 if (len < sizeof(struct sctp_initmsg))
4785 len = sizeof(struct sctp_initmsg);
4786 if (put_user(len, optlen))
4788 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4794 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4795 char __user *optval, int __user *optlen)
4797 struct sctp_association *asoc;
4799 struct sctp_getaddrs getaddrs;
4800 struct sctp_transport *from;
4802 union sctp_addr temp;
4803 struct sctp_sock *sp = sctp_sk(sk);
4808 if (len < sizeof(struct sctp_getaddrs))
4811 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4814 /* For UDP-style sockets, id specifies the association to query. */
4815 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4819 to = optval + offsetof(struct sctp_getaddrs, addrs);
4820 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4822 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4824 memcpy(&temp, &from->ipaddr, sizeof(temp));
4825 addrlen = sctp_get_pf_specific(sk->sk_family)
4826 ->addr_to_user(sp, &temp);
4827 if (space_left < addrlen)
4829 if (copy_to_user(to, &temp, addrlen))
4833 space_left -= addrlen;
4836 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4838 bytes_copied = ((char __user *)to) - optval;
4839 if (put_user(bytes_copied, optlen))
4845 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4846 size_t space_left, int *bytes_copied)
4848 struct sctp_sockaddr_entry *addr;
4849 union sctp_addr temp;
4852 struct net *net = sock_net(sk);
4855 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4859 if ((PF_INET == sk->sk_family) &&
4860 (AF_INET6 == addr->a.sa.sa_family))
4862 if ((PF_INET6 == sk->sk_family) &&
4863 inet_v6_ipv6only(sk) &&
4864 (AF_INET == addr->a.sa.sa_family))
4866 memcpy(&temp, &addr->a, sizeof(temp));
4867 if (!temp.v4.sin_port)
4868 temp.v4.sin_port = htons(port);
4870 addrlen = sctp_get_pf_specific(sk->sk_family)
4871 ->addr_to_user(sctp_sk(sk), &temp);
4873 if (space_left < addrlen) {
4877 memcpy(to, &temp, addrlen);
4881 space_left -= addrlen;
4882 *bytes_copied += addrlen;
4890 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4891 char __user *optval, int __user *optlen)
4893 struct sctp_bind_addr *bp;
4894 struct sctp_association *asoc;
4896 struct sctp_getaddrs getaddrs;
4897 struct sctp_sockaddr_entry *addr;
4899 union sctp_addr temp;
4900 struct sctp_sock *sp = sctp_sk(sk);
4904 int bytes_copied = 0;
4908 if (len < sizeof(struct sctp_getaddrs))
4911 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4915 * For UDP-style sockets, id specifies the association to query.
4916 * If the id field is set to the value '0' then the locally bound
4917 * addresses are returned without regard to any particular
4920 if (0 == getaddrs.assoc_id) {
4921 bp = &sctp_sk(sk)->ep->base.bind_addr;
4923 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4926 bp = &asoc->base.bind_addr;
4929 to = optval + offsetof(struct sctp_getaddrs, addrs);
4930 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4932 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
4936 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4937 * addresses from the global local address list.
4939 if (sctp_list_single_entry(&bp->address_list)) {
4940 addr = list_entry(bp->address_list.next,
4941 struct sctp_sockaddr_entry, list);
4942 if (sctp_is_any(sk, &addr->a)) {
4943 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4944 space_left, &bytes_copied);
4954 /* Protection on the bound address list is not needed since
4955 * in the socket option context we hold a socket lock and
4956 * thus the bound address list can't change.
4958 list_for_each_entry(addr, &bp->address_list, list) {
4959 memcpy(&temp, &addr->a, sizeof(temp));
4960 addrlen = sctp_get_pf_specific(sk->sk_family)
4961 ->addr_to_user(sp, &temp);
4962 if (space_left < addrlen) {
4963 err = -ENOMEM; /*fixme: right error?*/
4966 memcpy(buf, &temp, addrlen);
4968 bytes_copied += addrlen;
4970 space_left -= addrlen;
4974 if (copy_to_user(to, addrs, bytes_copied)) {
4978 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4982 if (put_user(bytes_copied, optlen))
4989 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4991 * Requests that the local SCTP stack use the enclosed peer address as
4992 * the association primary. The enclosed address must be one of the
4993 * association peer's addresses.
4995 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4996 char __user *optval, int __user *optlen)
4998 struct sctp_prim prim;
4999 struct sctp_association *asoc;
5000 struct sctp_sock *sp = sctp_sk(sk);
5002 if (len < sizeof(struct sctp_prim))
5005 len = sizeof(struct sctp_prim);
5007 if (copy_from_user(&prim, optval, len))
5010 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5014 if (!asoc->peer.primary_path)
5017 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5018 asoc->peer.primary_path->af_specific->sockaddr_len);
5020 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5021 (union sctp_addr *)&prim.ssp_addr);
5023 if (put_user(len, optlen))
5025 if (copy_to_user(optval, &prim, len))
5032 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5034 * Requests that the local endpoint set the specified Adaptation Layer
5035 * Indication parameter for all future INIT and INIT-ACK exchanges.
5037 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5038 char __user *optval, int __user *optlen)
5040 struct sctp_setadaptation adaptation;
5042 if (len < sizeof(struct sctp_setadaptation))
5045 len = sizeof(struct sctp_setadaptation);
5047 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5049 if (put_user(len, optlen))
5051 if (copy_to_user(optval, &adaptation, len))
5059 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5061 * Applications that wish to use the sendto() system call may wish to
5062 * specify a default set of parameters that would normally be supplied
5063 * through the inclusion of ancillary data. This socket option allows
5064 * such an application to set the default sctp_sndrcvinfo structure.
5067 * The application that wishes to use this socket option simply passes
5068 * in to this call the sctp_sndrcvinfo structure defined in Section
5069 * 5.2.2) The input parameters accepted by this call include
5070 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5071 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5072 * to this call if the caller is using the UDP model.
5074 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5076 static int sctp_getsockopt_default_send_param(struct sock *sk,
5077 int len, char __user *optval,
5080 struct sctp_sock *sp = sctp_sk(sk);
5081 struct sctp_association *asoc;
5082 struct sctp_sndrcvinfo info;
5084 if (len < sizeof(info))
5089 if (copy_from_user(&info, optval, len))
5092 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5093 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5096 info.sinfo_stream = asoc->default_stream;
5097 info.sinfo_flags = asoc->default_flags;
5098 info.sinfo_ppid = asoc->default_ppid;
5099 info.sinfo_context = asoc->default_context;
5100 info.sinfo_timetolive = asoc->default_timetolive;
5102 info.sinfo_stream = sp->default_stream;
5103 info.sinfo_flags = sp->default_flags;
5104 info.sinfo_ppid = sp->default_ppid;
5105 info.sinfo_context = sp->default_context;
5106 info.sinfo_timetolive = sp->default_timetolive;
5109 if (put_user(len, optlen))
5111 if (copy_to_user(optval, &info, len))
5117 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5118 * (SCTP_DEFAULT_SNDINFO)
5120 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5121 char __user *optval,
5124 struct sctp_sock *sp = sctp_sk(sk);
5125 struct sctp_association *asoc;
5126 struct sctp_sndinfo info;
5128 if (len < sizeof(info))
5133 if (copy_from_user(&info, optval, len))
5136 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5137 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5140 info.snd_sid = asoc->default_stream;
5141 info.snd_flags = asoc->default_flags;
5142 info.snd_ppid = asoc->default_ppid;
5143 info.snd_context = asoc->default_context;
5145 info.snd_sid = sp->default_stream;
5146 info.snd_flags = sp->default_flags;
5147 info.snd_ppid = sp->default_ppid;
5148 info.snd_context = sp->default_context;
5151 if (put_user(len, optlen))
5153 if (copy_to_user(optval, &info, len))
5161 * 7.1.5 SCTP_NODELAY
5163 * Turn on/off any Nagle-like algorithm. This means that packets are
5164 * generally sent as soon as possible and no unnecessary delays are
5165 * introduced, at the cost of more packets in the network. Expects an
5166 * integer boolean flag.
5169 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5170 char __user *optval, int __user *optlen)
5174 if (len < sizeof(int))
5178 val = (sctp_sk(sk)->nodelay == 1);
5179 if (put_user(len, optlen))
5181 if (copy_to_user(optval, &val, len))
5188 * 7.1.1 SCTP_RTOINFO
5190 * The protocol parameters used to initialize and bound retransmission
5191 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5192 * and modify these parameters.
5193 * All parameters are time values, in milliseconds. A value of 0, when
5194 * modifying the parameters, indicates that the current value should not
5198 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5199 char __user *optval,
5200 int __user *optlen) {
5201 struct sctp_rtoinfo rtoinfo;
5202 struct sctp_association *asoc;
5204 if (len < sizeof (struct sctp_rtoinfo))
5207 len = sizeof(struct sctp_rtoinfo);
5209 if (copy_from_user(&rtoinfo, optval, len))
5212 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5214 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5217 /* Values corresponding to the specific association. */
5219 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5220 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5221 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5223 /* Values corresponding to the endpoint. */
5224 struct sctp_sock *sp = sctp_sk(sk);
5226 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5227 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5228 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5231 if (put_user(len, optlen))
5234 if (copy_to_user(optval, &rtoinfo, len))
5242 * 7.1.2 SCTP_ASSOCINFO
5244 * This option is used to tune the maximum retransmission attempts
5245 * of the association.
5246 * Returns an error if the new association retransmission value is
5247 * greater than the sum of the retransmission value of the peer.
5248 * See [SCTP] for more information.
5251 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5252 char __user *optval,
5256 struct sctp_assocparams assocparams;
5257 struct sctp_association *asoc;
5258 struct list_head *pos;
5261 if (len < sizeof (struct sctp_assocparams))
5264 len = sizeof(struct sctp_assocparams);
5266 if (copy_from_user(&assocparams, optval, len))
5269 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5271 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5274 /* Values correspoinding to the specific association */
5276 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5277 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5278 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5279 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5281 list_for_each(pos, &asoc->peer.transport_addr_list) {
5285 assocparams.sasoc_number_peer_destinations = cnt;
5287 /* Values corresponding to the endpoint */
5288 struct sctp_sock *sp = sctp_sk(sk);
5290 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5291 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5292 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5293 assocparams.sasoc_cookie_life =
5294 sp->assocparams.sasoc_cookie_life;
5295 assocparams.sasoc_number_peer_destinations =
5297 sasoc_number_peer_destinations;
5300 if (put_user(len, optlen))
5303 if (copy_to_user(optval, &assocparams, len))
5310 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5312 * This socket option is a boolean flag which turns on or off mapped V4
5313 * addresses. If this option is turned on and the socket is type
5314 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5315 * If this option is turned off, then no mapping will be done of V4
5316 * addresses and a user will receive both PF_INET6 and PF_INET type
5317 * addresses on the socket.
5319 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5320 char __user *optval, int __user *optlen)
5323 struct sctp_sock *sp = sctp_sk(sk);
5325 if (len < sizeof(int))
5330 if (put_user(len, optlen))
5332 if (copy_to_user(optval, &val, len))
5339 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5340 * (chapter and verse is quoted at sctp_setsockopt_context())
5342 static int sctp_getsockopt_context(struct sock *sk, int len,
5343 char __user *optval, int __user *optlen)
5345 struct sctp_assoc_value params;
5346 struct sctp_sock *sp;
5347 struct sctp_association *asoc;
5349 if (len < sizeof(struct sctp_assoc_value))
5352 len = sizeof(struct sctp_assoc_value);
5354 if (copy_from_user(¶ms, optval, len))
5359 if (params.assoc_id != 0) {
5360 asoc = sctp_id2assoc(sk, params.assoc_id);
5363 params.assoc_value = asoc->default_rcv_context;
5365 params.assoc_value = sp->default_rcv_context;
5368 if (put_user(len, optlen))
5370 if (copy_to_user(optval, ¶ms, len))
5377 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5378 * This option will get or set the maximum size to put in any outgoing
5379 * SCTP DATA chunk. If a message is larger than this size it will be
5380 * fragmented by SCTP into the specified size. Note that the underlying
5381 * SCTP implementation may fragment into smaller sized chunks when the
5382 * PMTU of the underlying association is smaller than the value set by
5383 * the user. The default value for this option is '0' which indicates
5384 * the user is NOT limiting fragmentation and only the PMTU will effect
5385 * SCTP's choice of DATA chunk size. Note also that values set larger
5386 * than the maximum size of an IP datagram will effectively let SCTP
5387 * control fragmentation (i.e. the same as setting this option to 0).
5389 * The following structure is used to access and modify this parameter:
5391 * struct sctp_assoc_value {
5392 * sctp_assoc_t assoc_id;
5393 * uint32_t assoc_value;
5396 * assoc_id: This parameter is ignored for one-to-one style sockets.
5397 * For one-to-many style sockets this parameter indicates which
5398 * association the user is performing an action upon. Note that if
5399 * this field's value is zero then the endpoints default value is
5400 * changed (effecting future associations only).
5401 * assoc_value: This parameter specifies the maximum size in bytes.
5403 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5404 char __user *optval, int __user *optlen)
5406 struct sctp_assoc_value params;
5407 struct sctp_association *asoc;
5409 if (len == sizeof(int)) {
5410 pr_warn_ratelimited(DEPRECATED
5412 "Use of int in maxseg socket option.\n"
5413 "Use struct sctp_assoc_value instead\n",
5414 current->comm, task_pid_nr(current));
5415 params.assoc_id = 0;
5416 } else if (len >= sizeof(struct sctp_assoc_value)) {
5417 len = sizeof(struct sctp_assoc_value);
5418 if (copy_from_user(¶ms, optval, sizeof(params)))
5423 asoc = sctp_id2assoc(sk, params.assoc_id);
5424 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5428 params.assoc_value = asoc->frag_point;
5430 params.assoc_value = sctp_sk(sk)->user_frag;
5432 if (put_user(len, optlen))
5434 if (len == sizeof(int)) {
5435 if (copy_to_user(optval, ¶ms.assoc_value, len))
5438 if (copy_to_user(optval, ¶ms, len))
5446 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5447 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5449 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5450 char __user *optval, int __user *optlen)
5454 if (len < sizeof(int))
5459 val = sctp_sk(sk)->frag_interleave;
5460 if (put_user(len, optlen))
5462 if (copy_to_user(optval, &val, len))
5469 * 7.1.25. Set or Get the sctp partial delivery point
5470 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5472 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5473 char __user *optval,
5478 if (len < sizeof(u32))
5483 val = sctp_sk(sk)->pd_point;
5484 if (put_user(len, optlen))
5486 if (copy_to_user(optval, &val, len))
5493 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5494 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5496 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5497 char __user *optval,
5500 struct sctp_assoc_value params;
5501 struct sctp_sock *sp;
5502 struct sctp_association *asoc;
5504 if (len == sizeof(int)) {
5505 pr_warn_ratelimited(DEPRECATED
5507 "Use of int in max_burst socket option.\n"
5508 "Use struct sctp_assoc_value instead\n",
5509 current->comm, task_pid_nr(current));
5510 params.assoc_id = 0;
5511 } else if (len >= sizeof(struct sctp_assoc_value)) {
5512 len = sizeof(struct sctp_assoc_value);
5513 if (copy_from_user(¶ms, optval, len))
5520 if (params.assoc_id != 0) {
5521 asoc = sctp_id2assoc(sk, params.assoc_id);
5524 params.assoc_value = asoc->max_burst;
5526 params.assoc_value = sp->max_burst;
5528 if (len == sizeof(int)) {
5529 if (copy_to_user(optval, ¶ms.assoc_value, len))
5532 if (copy_to_user(optval, ¶ms, len))
5540 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5541 char __user *optval, int __user *optlen)
5543 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5544 struct sctp_hmacalgo __user *p = (void __user *)optval;
5545 struct sctp_hmac_algo_param *hmacs;
5550 if (!ep->auth_enable)
5553 hmacs = ep->auth_hmacs_list;
5554 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5556 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5559 len = sizeof(struct sctp_hmacalgo) + data_len;
5560 num_idents = data_len / sizeof(u16);
5562 if (put_user(len, optlen))
5564 if (put_user(num_idents, &p->shmac_num_idents))
5566 for (i = 0; i < num_idents; i++) {
5567 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
5569 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
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_USER | __GFP_NOWARN);
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))
5985 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5987 case SCTP_DISABLE_FRAGMENTS:
5988 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5992 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5994 case SCTP_AUTOCLOSE:
5995 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5997 case SCTP_SOCKOPT_PEELOFF:
5998 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6000 case SCTP_PEER_ADDR_PARAMS:
6001 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6004 case SCTP_DELAYED_SACK:
6005 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6009 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6011 case SCTP_GET_PEER_ADDRS:
6012 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6015 case SCTP_GET_LOCAL_ADDRS:
6016 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6019 case SCTP_SOCKOPT_CONNECTX3:
6020 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6022 case SCTP_DEFAULT_SEND_PARAM:
6023 retval = sctp_getsockopt_default_send_param(sk, len,
6026 case SCTP_DEFAULT_SNDINFO:
6027 retval = sctp_getsockopt_default_sndinfo(sk, len,
6030 case SCTP_PRIMARY_ADDR:
6031 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6034 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6037 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6039 case SCTP_ASSOCINFO:
6040 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6042 case SCTP_I_WANT_MAPPED_V4_ADDR:
6043 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6046 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6048 case SCTP_GET_PEER_ADDR_INFO:
6049 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6052 case SCTP_ADAPTATION_LAYER:
6053 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6057 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6059 case SCTP_FRAGMENT_INTERLEAVE:
6060 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6063 case SCTP_PARTIAL_DELIVERY_POINT:
6064 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6067 case SCTP_MAX_BURST:
6068 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6071 case SCTP_AUTH_CHUNK:
6072 case SCTP_AUTH_DELETE_KEY:
6073 retval = -EOPNOTSUPP;
6075 case SCTP_HMAC_IDENT:
6076 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6078 case SCTP_AUTH_ACTIVE_KEY:
6079 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6081 case SCTP_PEER_AUTH_CHUNKS:
6082 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6085 case SCTP_LOCAL_AUTH_CHUNKS:
6086 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6089 case SCTP_GET_ASSOC_NUMBER:
6090 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6092 case SCTP_GET_ASSOC_ID_LIST:
6093 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6095 case SCTP_AUTO_ASCONF:
6096 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6098 case SCTP_PEER_ADDR_THLDS:
6099 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6101 case SCTP_GET_ASSOC_STATS:
6102 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6104 case SCTP_RECVRCVINFO:
6105 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6107 case SCTP_RECVNXTINFO:
6108 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6111 retval = -ENOPROTOOPT;
6119 static void sctp_hash(struct sock *sk)
6124 static void sctp_unhash(struct sock *sk)
6129 /* Check if port is acceptable. Possibly find first available port.
6131 * The port hash table (contained in the 'global' SCTP protocol storage
6132 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6133 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6134 * list (the list number is the port number hashed out, so as you
6135 * would expect from a hash function, all the ports in a given list have
6136 * such a number that hashes out to the same list number; you were
6137 * expecting that, right?); so each list has a set of ports, with a
6138 * link to the socket (struct sock) that uses it, the port number and
6139 * a fastreuse flag (FIXME: NPI ipg).
6141 static struct sctp_bind_bucket *sctp_bucket_create(
6142 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6144 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6146 struct sctp_bind_hashbucket *head; /* hash list */
6147 struct sctp_bind_bucket *pp;
6148 unsigned short snum;
6151 snum = ntohs(addr->v4.sin_port);
6153 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6158 /* Search for an available port. */
6159 int low, high, remaining, index;
6161 struct net *net = sock_net(sk);
6163 inet_get_local_port_range(net, &low, &high);
6164 remaining = (high - low) + 1;
6165 rover = prandom_u32() % remaining + low;
6169 if ((rover < low) || (rover > high))
6171 if (inet_is_local_reserved_port(net, rover))
6173 index = sctp_phashfn(sock_net(sk), rover);
6174 head = &sctp_port_hashtable[index];
6175 spin_lock(&head->lock);
6176 sctp_for_each_hentry(pp, &head->chain)
6177 if ((pp->port == rover) &&
6178 net_eq(sock_net(sk), pp->net))
6182 spin_unlock(&head->lock);
6183 } while (--remaining > 0);
6185 /* Exhausted local port range during search? */
6190 /* OK, here is the one we will use. HEAD (the port
6191 * hash table list entry) is non-NULL and we hold it's
6196 /* We are given an specific port number; we verify
6197 * that it is not being used. If it is used, we will
6198 * exahust the search in the hash list corresponding
6199 * to the port number (snum) - we detect that with the
6200 * port iterator, pp being NULL.
6202 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6203 spin_lock(&head->lock);
6204 sctp_for_each_hentry(pp, &head->chain) {
6205 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6212 if (!hlist_empty(&pp->owner)) {
6213 /* We had a port hash table hit - there is an
6214 * available port (pp != NULL) and it is being
6215 * used by other socket (pp->owner not empty); that other
6216 * socket is going to be sk2.
6218 int reuse = sk->sk_reuse;
6221 pr_debug("%s: found a possible match\n", __func__);
6223 if (pp->fastreuse && sk->sk_reuse &&
6224 sk->sk_state != SCTP_SS_LISTENING)
6227 /* Run through the list of sockets bound to the port
6228 * (pp->port) [via the pointers bind_next and
6229 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6230 * we get the endpoint they describe and run through
6231 * the endpoint's list of IP (v4 or v6) addresses,
6232 * comparing each of the addresses with the address of
6233 * the socket sk. If we find a match, then that means
6234 * that this port/socket (sk) combination are already
6237 sk_for_each_bound(sk2, &pp->owner) {
6238 struct sctp_endpoint *ep2;
6239 ep2 = sctp_sk(sk2)->ep;
6242 (reuse && sk2->sk_reuse &&
6243 sk2->sk_state != SCTP_SS_LISTENING))
6246 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6247 sctp_sk(sk2), sctp_sk(sk))) {
6253 pr_debug("%s: found a match\n", __func__);
6256 /* If there was a hash table miss, create a new port. */
6258 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6261 /* In either case (hit or miss), make sure fastreuse is 1 only
6262 * if sk->sk_reuse is too (that is, if the caller requested
6263 * SO_REUSEADDR on this socket -sk-).
6265 if (hlist_empty(&pp->owner)) {
6266 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6270 } else if (pp->fastreuse &&
6271 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6274 /* We are set, so fill up all the data in the hash table
6275 * entry, tie the socket list information with the rest of the
6276 * sockets FIXME: Blurry, NPI (ipg).
6279 if (!sctp_sk(sk)->bind_hash) {
6280 inet_sk(sk)->inet_num = snum;
6281 sk_add_bind_node(sk, &pp->owner);
6282 sctp_sk(sk)->bind_hash = pp;
6287 spin_unlock(&head->lock);
6294 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6295 * port is requested.
6297 static int sctp_get_port(struct sock *sk, unsigned short snum)
6299 union sctp_addr addr;
6300 struct sctp_af *af = sctp_sk(sk)->pf->af;
6302 /* Set up a dummy address struct from the sk. */
6303 af->from_sk(&addr, sk);
6304 addr.v4.sin_port = htons(snum);
6306 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6307 return !!sctp_get_port_local(sk, &addr);
6311 * Move a socket to LISTENING state.
6313 static int sctp_listen_start(struct sock *sk, int backlog)
6315 struct sctp_sock *sp = sctp_sk(sk);
6316 struct sctp_endpoint *ep = sp->ep;
6317 struct crypto_hash *tfm = NULL;
6320 /* Allocate HMAC for generating cookie. */
6321 if (!sp->hmac && sp->sctp_hmac_alg) {
6322 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6323 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6325 net_info_ratelimited("failed to load transform for %s: %ld\n",
6326 sp->sctp_hmac_alg, PTR_ERR(tfm));
6329 sctp_sk(sk)->hmac = tfm;
6333 * If a bind() or sctp_bindx() is not called prior to a listen()
6334 * call that allows new associations to be accepted, the system
6335 * picks an ephemeral port and will choose an address set equivalent
6336 * to binding with a wildcard address.
6338 * This is not currently spelled out in the SCTP sockets
6339 * extensions draft, but follows the practice as seen in TCP
6343 sk->sk_state = SCTP_SS_LISTENING;
6344 if (!ep->base.bind_addr.port) {
6345 if (sctp_autobind(sk))
6348 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6349 sk->sk_state = SCTP_SS_CLOSED;
6354 sk->sk_max_ack_backlog = backlog;
6355 sctp_hash_endpoint(ep);
6360 * 4.1.3 / 5.1.3 listen()
6362 * By default, new associations are not accepted for UDP style sockets.
6363 * An application uses listen() to mark a socket as being able to
6364 * accept new associations.
6366 * On TCP style sockets, applications use listen() to ready the SCTP
6367 * endpoint for accepting inbound associations.
6369 * On both types of endpoints a backlog of '0' disables listening.
6371 * Move a socket to LISTENING state.
6373 int sctp_inet_listen(struct socket *sock, int backlog)
6375 struct sock *sk = sock->sk;
6376 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6379 if (unlikely(backlog < 0))
6384 /* Peeled-off sockets are not allowed to listen(). */
6385 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6388 if (sock->state != SS_UNCONNECTED)
6391 /* If backlog is zero, disable listening. */
6393 if (sctp_sstate(sk, CLOSED))
6397 sctp_unhash_endpoint(ep);
6398 sk->sk_state = SCTP_SS_CLOSED;
6400 sctp_sk(sk)->bind_hash->fastreuse = 1;
6404 /* If we are already listening, just update the backlog */
6405 if (sctp_sstate(sk, LISTENING))
6406 sk->sk_max_ack_backlog = backlog;
6408 err = sctp_listen_start(sk, backlog);
6420 * This function is done by modeling the current datagram_poll() and the
6421 * tcp_poll(). Note that, based on these implementations, we don't
6422 * lock the socket in this function, even though it seems that,
6423 * ideally, locking or some other mechanisms can be used to ensure
6424 * the integrity of the counters (sndbuf and wmem_alloc) used
6425 * in this place. We assume that we don't need locks either until proven
6428 * Another thing to note is that we include the Async I/O support
6429 * here, again, by modeling the current TCP/UDP code. We don't have
6430 * a good way to test with it yet.
6432 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6434 struct sock *sk = sock->sk;
6435 struct sctp_sock *sp = sctp_sk(sk);
6438 poll_wait(file, sk_sleep(sk), wait);
6440 /* A TCP-style listening socket becomes readable when the accept queue
6443 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6444 return (!list_empty(&sp->ep->asocs)) ?
6445 (POLLIN | POLLRDNORM) : 0;
6449 /* Is there any exceptional events? */
6450 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6452 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6453 if (sk->sk_shutdown & RCV_SHUTDOWN)
6454 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6455 if (sk->sk_shutdown == SHUTDOWN_MASK)
6458 /* Is it readable? Reconsider this code with TCP-style support. */
6459 if (!skb_queue_empty(&sk->sk_receive_queue))
6460 mask |= POLLIN | POLLRDNORM;
6462 /* The association is either gone or not ready. */
6463 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6466 /* Is it writable? */
6467 if (sctp_writeable(sk)) {
6468 mask |= POLLOUT | POLLWRNORM;
6470 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
6472 * Since the socket is not locked, the buffer
6473 * might be made available after the writeable check and
6474 * before the bit is set. This could cause a lost I/O
6475 * signal. tcp_poll() has a race breaker for this race
6476 * condition. Based on their implementation, we put
6477 * in the following code to cover it as well.
6479 if (sctp_writeable(sk))
6480 mask |= POLLOUT | POLLWRNORM;
6485 /********************************************************************
6486 * 2nd Level Abstractions
6487 ********************************************************************/
6489 static struct sctp_bind_bucket *sctp_bucket_create(
6490 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6492 struct sctp_bind_bucket *pp;
6494 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6496 SCTP_DBG_OBJCNT_INC(bind_bucket);
6499 INIT_HLIST_HEAD(&pp->owner);
6501 hlist_add_head(&pp->node, &head->chain);
6506 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6507 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6509 if (pp && hlist_empty(&pp->owner)) {
6510 __hlist_del(&pp->node);
6511 kmem_cache_free(sctp_bucket_cachep, pp);
6512 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6516 /* Release this socket's reference to a local port. */
6517 static inline void __sctp_put_port(struct sock *sk)
6519 struct sctp_bind_hashbucket *head =
6520 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6521 inet_sk(sk)->inet_num)];
6522 struct sctp_bind_bucket *pp;
6524 spin_lock(&head->lock);
6525 pp = sctp_sk(sk)->bind_hash;
6526 __sk_del_bind_node(sk);
6527 sctp_sk(sk)->bind_hash = NULL;
6528 inet_sk(sk)->inet_num = 0;
6529 sctp_bucket_destroy(pp);
6530 spin_unlock(&head->lock);
6533 void sctp_put_port(struct sock *sk)
6536 __sctp_put_port(sk);
6541 * The system picks an ephemeral port and choose an address set equivalent
6542 * to binding with a wildcard address.
6543 * One of those addresses will be the primary address for the association.
6544 * This automatically enables the multihoming capability of SCTP.
6546 static int sctp_autobind(struct sock *sk)
6548 union sctp_addr autoaddr;
6552 /* Initialize a local sockaddr structure to INADDR_ANY. */
6553 af = sctp_sk(sk)->pf->af;
6555 port = htons(inet_sk(sk)->inet_num);
6556 af->inaddr_any(&autoaddr, port);
6558 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6561 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6564 * 4.2 The cmsghdr Structure *
6566 * When ancillary data is sent or received, any number of ancillary data
6567 * objects can be specified by the msg_control and msg_controllen members of
6568 * the msghdr structure, because each object is preceded by
6569 * a cmsghdr structure defining the object's length (the cmsg_len member).
6570 * Historically Berkeley-derived implementations have passed only one object
6571 * at a time, but this API allows multiple objects to be
6572 * passed in a single call to sendmsg() or recvmsg(). The following example
6573 * shows two ancillary data objects in a control buffer.
6575 * |<--------------------------- msg_controllen -------------------------->|
6578 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6580 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6583 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6585 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6588 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6589 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6591 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6593 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6600 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6602 struct cmsghdr *cmsg;
6603 struct msghdr *my_msg = (struct msghdr *)msg;
6605 for_each_cmsghdr(cmsg, my_msg) {
6606 if (!CMSG_OK(my_msg, cmsg))
6609 /* Should we parse this header or ignore? */
6610 if (cmsg->cmsg_level != IPPROTO_SCTP)
6613 /* Strictly check lengths following example in SCM code. */
6614 switch (cmsg->cmsg_type) {
6616 /* SCTP Socket API Extension
6617 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6619 * This cmsghdr structure provides information for
6620 * initializing new SCTP associations with sendmsg().
6621 * The SCTP_INITMSG socket option uses this same data
6622 * structure. This structure is not used for
6625 * cmsg_level cmsg_type cmsg_data[]
6626 * ------------ ------------ ----------------------
6627 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6629 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6632 cmsgs->init = CMSG_DATA(cmsg);
6636 /* SCTP Socket API Extension
6637 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6639 * This cmsghdr structure specifies SCTP options for
6640 * sendmsg() and describes SCTP header information
6641 * about a received message through recvmsg().
6643 * cmsg_level cmsg_type cmsg_data[]
6644 * ------------ ------------ ----------------------
6645 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6647 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6650 cmsgs->srinfo = CMSG_DATA(cmsg);
6652 if (cmsgs->srinfo->sinfo_flags &
6653 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6654 SCTP_SACK_IMMEDIATELY |
6655 SCTP_ABORT | SCTP_EOF))
6660 /* SCTP Socket API Extension
6661 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6663 * This cmsghdr structure specifies SCTP options for
6664 * sendmsg(). This structure and SCTP_RCVINFO replaces
6665 * SCTP_SNDRCV which has been deprecated.
6667 * cmsg_level cmsg_type cmsg_data[]
6668 * ------------ ------------ ---------------------
6669 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6671 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6674 cmsgs->sinfo = CMSG_DATA(cmsg);
6676 if (cmsgs->sinfo->snd_flags &
6677 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6678 SCTP_SACK_IMMEDIATELY |
6679 SCTP_ABORT | SCTP_EOF))
6691 * Wait for a packet..
6692 * Note: This function is the same function as in core/datagram.c
6693 * with a few modifications to make lksctp work.
6695 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6700 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6702 /* Socket errors? */
6703 error = sock_error(sk);
6707 if (!skb_queue_empty(&sk->sk_receive_queue))
6710 /* Socket shut down? */
6711 if (sk->sk_shutdown & RCV_SHUTDOWN)
6714 /* Sequenced packets can come disconnected. If so we report the
6719 /* Is there a good reason to think that we may receive some data? */
6720 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6723 /* Handle signals. */
6724 if (signal_pending(current))
6727 /* Let another process have a go. Since we are going to sleep
6728 * anyway. Note: This may cause odd behaviors if the message
6729 * does not fit in the user's buffer, but this seems to be the
6730 * only way to honor MSG_DONTWAIT realistically.
6733 *timeo_p = schedule_timeout(*timeo_p);
6737 finish_wait(sk_sleep(sk), &wait);
6741 error = sock_intr_errno(*timeo_p);
6744 finish_wait(sk_sleep(sk), &wait);
6749 /* Receive a datagram.
6750 * Note: This is pretty much the same routine as in core/datagram.c
6751 * with a few changes to make lksctp work.
6753 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6754 int noblock, int *err)
6757 struct sk_buff *skb;
6760 timeo = sock_rcvtimeo(sk, noblock);
6762 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6763 MAX_SCHEDULE_TIMEOUT);
6766 /* Again only user level code calls this function,
6767 * so nothing interrupt level
6768 * will suddenly eat the receive_queue.
6770 * Look at current nfs client by the way...
6771 * However, this function was correct in any case. 8)
6773 if (flags & MSG_PEEK) {
6774 spin_lock_bh(&sk->sk_receive_queue.lock);
6775 skb = skb_peek(&sk->sk_receive_queue);
6777 atomic_inc(&skb->users);
6778 spin_unlock_bh(&sk->sk_receive_queue.lock);
6780 skb = skb_dequeue(&sk->sk_receive_queue);
6786 /* Caller is allowed not to check sk->sk_err before calling. */
6787 error = sock_error(sk);
6791 if (sk->sk_shutdown & RCV_SHUTDOWN)
6794 if (sk_can_busy_loop(sk) &&
6795 sk_busy_loop(sk, noblock))
6798 /* User doesn't want to wait. */
6802 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6811 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6812 static void __sctp_write_space(struct sctp_association *asoc)
6814 struct sock *sk = asoc->base.sk;
6816 if (sctp_wspace(asoc) <= 0)
6819 if (waitqueue_active(&asoc->wait))
6820 wake_up_interruptible(&asoc->wait);
6822 if (sctp_writeable(sk)) {
6823 struct socket_wq *wq;
6826 wq = rcu_dereference(sk->sk_wq);
6828 if (waitqueue_active(&wq->wait))
6829 wake_up_interruptible(&wq->wait);
6831 /* Note that we try to include the Async I/O support
6832 * here by modeling from the current TCP/UDP code.
6833 * We have not tested with it yet.
6835 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6836 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
6842 static void sctp_wake_up_waiters(struct sock *sk,
6843 struct sctp_association *asoc)
6845 struct sctp_association *tmp = asoc;
6847 /* We do accounting for the sndbuf space per association,
6848 * so we only need to wake our own association.
6850 if (asoc->ep->sndbuf_policy)
6851 return __sctp_write_space(asoc);
6853 /* If association goes down and is just flushing its
6854 * outq, then just normally notify others.
6856 if (asoc->base.dead)
6857 return sctp_write_space(sk);
6859 /* Accounting for the sndbuf space is per socket, so we
6860 * need to wake up others, try to be fair and in case of
6861 * other associations, let them have a go first instead
6862 * of just doing a sctp_write_space() call.
6864 * Note that we reach sctp_wake_up_waiters() only when
6865 * associations free up queued chunks, thus we are under
6866 * lock and the list of associations on a socket is
6867 * guaranteed not to change.
6869 for (tmp = list_next_entry(tmp, asocs); 1;
6870 tmp = list_next_entry(tmp, asocs)) {
6871 /* Manually skip the head element. */
6872 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6874 /* Wake up association. */
6875 __sctp_write_space(tmp);
6876 /* We've reached the end. */
6882 /* Do accounting for the sndbuf space.
6883 * Decrement the used sndbuf space of the corresponding association by the
6884 * data size which was just transmitted(freed).
6886 static void sctp_wfree(struct sk_buff *skb)
6888 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
6889 struct sctp_association *asoc = chunk->asoc;
6890 struct sock *sk = asoc->base.sk;
6892 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6893 sizeof(struct sk_buff) +
6894 sizeof(struct sctp_chunk);
6896 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6899 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6901 sk->sk_wmem_queued -= skb->truesize;
6902 sk_mem_uncharge(sk, skb->truesize);
6905 sctp_wake_up_waiters(sk, asoc);
6907 sctp_association_put(asoc);
6910 /* Do accounting for the receive space on the socket.
6911 * Accounting for the association is done in ulpevent.c
6912 * We set this as a destructor for the cloned data skbs so that
6913 * accounting is done at the correct time.
6915 void sctp_sock_rfree(struct sk_buff *skb)
6917 struct sock *sk = skb->sk;
6918 struct sctp_ulpevent *event = sctp_skb2event(skb);
6920 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6923 * Mimic the behavior of sock_rfree
6925 sk_mem_uncharge(sk, event->rmem_len);
6929 /* Helper function to wait for space in the sndbuf. */
6930 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6933 struct sock *sk = asoc->base.sk;
6935 long current_timeo = *timeo_p;
6938 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6941 /* Increment the association's refcnt. */
6942 sctp_association_hold(asoc);
6944 /* Wait on the association specific sndbuf space. */
6946 prepare_to_wait_exclusive(&asoc->wait, &wait,
6947 TASK_INTERRUPTIBLE);
6950 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6953 if (signal_pending(current))
6954 goto do_interrupted;
6955 if (msg_len <= sctp_wspace(asoc))
6958 /* Let another process have a go. Since we are going
6962 current_timeo = schedule_timeout(current_timeo);
6963 if (sk != asoc->base.sk)
6967 *timeo_p = current_timeo;
6971 finish_wait(&asoc->wait, &wait);
6973 /* Release the association's refcnt. */
6974 sctp_association_put(asoc);
6983 err = sock_intr_errno(*timeo_p);
6991 void sctp_data_ready(struct sock *sk)
6993 struct socket_wq *wq;
6996 wq = rcu_dereference(sk->sk_wq);
6997 if (wq_has_sleeper(wq))
6998 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6999 POLLRDNORM | POLLRDBAND);
7000 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7004 /* If socket sndbuf has changed, wake up all per association waiters. */
7005 void sctp_write_space(struct sock *sk)
7007 struct sctp_association *asoc;
7009 /* Wake up the tasks in each wait queue. */
7010 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7011 __sctp_write_space(asoc);
7015 /* Is there any sndbuf space available on the socket?
7017 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7018 * associations on the same socket. For a UDP-style socket with
7019 * multiple associations, it is possible for it to be "unwriteable"
7020 * prematurely. I assume that this is acceptable because
7021 * a premature "unwriteable" is better than an accidental "writeable" which
7022 * would cause an unwanted block under certain circumstances. For the 1-1
7023 * UDP-style sockets or TCP-style sockets, this code should work.
7026 static int sctp_writeable(struct sock *sk)
7030 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7036 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7037 * returns immediately with EINPROGRESS.
7039 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7041 struct sock *sk = asoc->base.sk;
7043 long current_timeo = *timeo_p;
7046 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7048 /* Increment the association's refcnt. */
7049 sctp_association_hold(asoc);
7052 prepare_to_wait_exclusive(&asoc->wait, &wait,
7053 TASK_INTERRUPTIBLE);
7056 if (sk->sk_shutdown & RCV_SHUTDOWN)
7058 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7061 if (signal_pending(current))
7062 goto do_interrupted;
7064 if (sctp_state(asoc, ESTABLISHED))
7067 /* Let another process have a go. Since we are going
7071 current_timeo = schedule_timeout(current_timeo);
7074 *timeo_p = current_timeo;
7078 finish_wait(&asoc->wait, &wait);
7080 /* Release the association's refcnt. */
7081 sctp_association_put(asoc);
7086 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7089 err = -ECONNREFUSED;
7093 err = sock_intr_errno(*timeo_p);
7101 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7103 struct sctp_endpoint *ep;
7107 ep = sctp_sk(sk)->ep;
7111 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
7112 TASK_INTERRUPTIBLE);
7114 if (list_empty(&ep->asocs)) {
7116 timeo = schedule_timeout(timeo);
7121 if (!sctp_sstate(sk, LISTENING))
7125 if (!list_empty(&ep->asocs))
7128 err = sock_intr_errno(timeo);
7129 if (signal_pending(current))
7137 finish_wait(sk_sleep(sk), &wait);
7142 static void sctp_wait_for_close(struct sock *sk, long timeout)
7147 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7148 if (list_empty(&sctp_sk(sk)->ep->asocs))
7151 timeout = schedule_timeout(timeout);
7153 } while (!signal_pending(current) && timeout);
7155 finish_wait(sk_sleep(sk), &wait);
7158 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7160 struct sk_buff *frag;
7165 /* Don't forget the fragments. */
7166 skb_walk_frags(skb, frag)
7167 sctp_skb_set_owner_r_frag(frag, sk);
7170 sctp_skb_set_owner_r(skb, sk);
7173 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7174 struct sctp_association *asoc)
7176 struct inet_sock *inet = inet_sk(sk);
7177 struct inet_sock *newinet;
7179 newsk->sk_type = sk->sk_type;
7180 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7181 newsk->sk_flags = sk->sk_flags;
7182 newsk->sk_tsflags = sk->sk_tsflags;
7183 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7184 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7185 newsk->sk_reuse = sk->sk_reuse;
7187 newsk->sk_shutdown = sk->sk_shutdown;
7188 newsk->sk_destruct = sctp_destruct_sock;
7189 newsk->sk_family = sk->sk_family;
7190 newsk->sk_protocol = IPPROTO_SCTP;
7191 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7192 newsk->sk_sndbuf = sk->sk_sndbuf;
7193 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7194 newsk->sk_lingertime = sk->sk_lingertime;
7195 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7196 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7198 newinet = inet_sk(newsk);
7200 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7201 * getsockname() and getpeername()
7203 newinet->inet_sport = inet->inet_sport;
7204 newinet->inet_saddr = inet->inet_saddr;
7205 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7206 newinet->inet_dport = htons(asoc->peer.port);
7207 newinet->pmtudisc = inet->pmtudisc;
7208 newinet->inet_id = asoc->next_tsn ^ jiffies;
7210 newinet->uc_ttl = inet->uc_ttl;
7211 newinet->mc_loop = 1;
7212 newinet->mc_ttl = 1;
7213 newinet->mc_index = 0;
7214 newinet->mc_list = NULL;
7216 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
7217 net_enable_timestamp();
7219 security_sk_clone(sk, newsk);
7222 static inline void sctp_copy_descendant(struct sock *sk_to,
7223 const struct sock *sk_from)
7225 int ancestor_size = sizeof(struct inet_sock) +
7226 sizeof(struct sctp_sock) -
7227 offsetof(struct sctp_sock, auto_asconf_list);
7229 if (sk_from->sk_family == PF_INET6)
7230 ancestor_size += sizeof(struct ipv6_pinfo);
7232 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7235 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7236 * and its messages to the newsk.
7238 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7239 struct sctp_association *assoc,
7240 sctp_socket_type_t type)
7242 struct sctp_sock *oldsp = sctp_sk(oldsk);
7243 struct sctp_sock *newsp = sctp_sk(newsk);
7244 struct sctp_bind_bucket *pp; /* hash list port iterator */
7245 struct sctp_endpoint *newep = newsp->ep;
7246 struct sk_buff *skb, *tmp;
7247 struct sctp_ulpevent *event;
7248 struct sctp_bind_hashbucket *head;
7250 /* Migrate socket buffer sizes and all the socket level options to the
7253 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7254 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7255 /* Brute force copy old sctp opt. */
7256 sctp_copy_descendant(newsk, oldsk);
7258 /* Restore the ep value that was overwritten with the above structure
7264 /* Hook this new socket in to the bind_hash list. */
7265 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7266 inet_sk(oldsk)->inet_num)];
7268 spin_lock(&head->lock);
7269 pp = sctp_sk(oldsk)->bind_hash;
7270 sk_add_bind_node(newsk, &pp->owner);
7271 sctp_sk(newsk)->bind_hash = pp;
7272 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7273 spin_unlock(&head->lock);
7276 /* Copy the bind_addr list from the original endpoint to the new
7277 * endpoint so that we can handle restarts properly
7279 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7280 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7282 /* Move any messages in the old socket's receive queue that are for the
7283 * peeled off association to the new socket's receive queue.
7285 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7286 event = sctp_skb2event(skb);
7287 if (event->asoc == assoc) {
7288 __skb_unlink(skb, &oldsk->sk_receive_queue);
7289 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7290 sctp_skb_set_owner_r_frag(skb, newsk);
7294 /* Clean up any messages pending delivery due to partial
7295 * delivery. Three cases:
7296 * 1) No partial deliver; no work.
7297 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7298 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7300 skb_queue_head_init(&newsp->pd_lobby);
7301 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7303 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7304 struct sk_buff_head *queue;
7306 /* Decide which queue to move pd_lobby skbs to. */
7307 if (assoc->ulpq.pd_mode) {
7308 queue = &newsp->pd_lobby;
7310 queue = &newsk->sk_receive_queue;
7312 /* Walk through the pd_lobby, looking for skbs that
7313 * need moved to the new socket.
7315 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7316 event = sctp_skb2event(skb);
7317 if (event->asoc == assoc) {
7318 __skb_unlink(skb, &oldsp->pd_lobby);
7319 __skb_queue_tail(queue, skb);
7320 sctp_skb_set_owner_r_frag(skb, newsk);
7324 /* Clear up any skbs waiting for the partial
7325 * delivery to finish.
7327 if (assoc->ulpq.pd_mode)
7328 sctp_clear_pd(oldsk, NULL);
7332 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7333 sctp_skb_set_owner_r_frag(skb, newsk);
7335 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7336 sctp_skb_set_owner_r_frag(skb, newsk);
7338 /* Set the type of socket to indicate that it is peeled off from the
7339 * original UDP-style socket or created with the accept() call on a
7340 * TCP-style socket..
7344 /* Mark the new socket "in-use" by the user so that any packets
7345 * that may arrive on the association after we've moved it are
7346 * queued to the backlog. This prevents a potential race between
7347 * backlog processing on the old socket and new-packet processing
7348 * on the new socket.
7350 * The caller has just allocated newsk so we can guarantee that other
7351 * paths won't try to lock it and then oldsk.
7353 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7354 sctp_assoc_migrate(assoc, newsk);
7356 /* If the association on the newsk is already closed before accept()
7357 * is called, set RCV_SHUTDOWN flag.
7359 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7360 newsk->sk_shutdown |= RCV_SHUTDOWN;
7362 newsk->sk_state = SCTP_SS_ESTABLISHED;
7363 release_sock(newsk);
7367 /* This proto struct describes the ULP interface for SCTP. */
7368 struct proto sctp_prot = {
7370 .owner = THIS_MODULE,
7371 .close = sctp_close,
7372 .connect = sctp_connect,
7373 .disconnect = sctp_disconnect,
7374 .accept = sctp_accept,
7375 .ioctl = sctp_ioctl,
7376 .init = sctp_init_sock,
7377 .destroy = sctp_destroy_sock,
7378 .shutdown = sctp_shutdown,
7379 .setsockopt = sctp_setsockopt,
7380 .getsockopt = sctp_getsockopt,
7381 .sendmsg = sctp_sendmsg,
7382 .recvmsg = sctp_recvmsg,
7384 .backlog_rcv = sctp_backlog_rcv,
7386 .unhash = sctp_unhash,
7387 .get_port = sctp_get_port,
7388 .obj_size = sizeof(struct sctp_sock),
7389 .sysctl_mem = sysctl_sctp_mem,
7390 .sysctl_rmem = sysctl_sctp_rmem,
7391 .sysctl_wmem = sysctl_sctp_wmem,
7392 .memory_pressure = &sctp_memory_pressure,
7393 .enter_memory_pressure = sctp_enter_memory_pressure,
7394 .memory_allocated = &sctp_memory_allocated,
7395 .sockets_allocated = &sctp_sockets_allocated,
7398 #if IS_ENABLED(CONFIG_IPV6)
7400 #include <net/transp_v6.h>
7401 static void sctp_v6_destroy_sock(struct sock *sk)
7403 sctp_destroy_sock(sk);
7404 inet6_destroy_sock(sk);
7407 struct proto sctpv6_prot = {
7409 .owner = THIS_MODULE,
7410 .close = sctp_close,
7411 .connect = sctp_connect,
7412 .disconnect = sctp_disconnect,
7413 .accept = sctp_accept,
7414 .ioctl = sctp_ioctl,
7415 .init = sctp_init_sock,
7416 .destroy = sctp_v6_destroy_sock,
7417 .shutdown = sctp_shutdown,
7418 .setsockopt = sctp_setsockopt,
7419 .getsockopt = sctp_getsockopt,
7420 .sendmsg = sctp_sendmsg,
7421 .recvmsg = sctp_recvmsg,
7423 .backlog_rcv = sctp_backlog_rcv,
7425 .unhash = sctp_unhash,
7426 .get_port = sctp_get_port,
7427 .obj_size = sizeof(struct sctp6_sock),
7428 .sysctl_mem = sysctl_sctp_mem,
7429 .sysctl_rmem = sysctl_sctp_rmem,
7430 .sysctl_wmem = sysctl_sctp_wmem,
7431 .memory_pressure = &sctp_memory_pressure,
7432 .enter_memory_pressure = sctp_enter_memory_pressure,
7433 .memory_allocated = &sctp_memory_allocated,
7434 .sockets_allocated = &sctp_sockets_allocated,
7436 #endif /* IS_ENABLED(CONFIG_IPV6) */