1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <linux/types.h>
56 #include <linux/kernel.h>
57 #include <linux/wait.h>
58 #include <linux/time.h>
60 #include <linux/capability.h>
61 #include <linux/fcntl.h>
62 #include <linux/poll.h>
63 #include <linux/init.h>
64 #include <linux/crypto.h>
65 #include <linux/slab.h>
66 #include <linux/file.h>
67 #include <linux/compat.h>
71 #include <net/route.h>
73 #include <net/inet_common.h>
74 #include <net/busy_poll.h>
76 #include <linux/socket.h> /* for sa_family_t */
77 #include <linux/export.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* Forward declarations for internal helper functions. */
83 static int sctp_writeable(struct sock *sk);
84 static void sctp_wfree(struct sk_buff *skb);
85 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
87 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
88 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
89 static int sctp_wait_for_accept(struct sock *sk, long timeo);
90 static void sctp_wait_for_close(struct sock *sk, long timeo);
91 static void sctp_destruct_sock(struct sock *sk);
92 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
93 union sctp_addr *addr, int len);
94 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
95 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
96 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
97 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf(struct sctp_association *asoc,
99 struct sctp_chunk *chunk);
100 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
101 static int sctp_autobind(struct sock *sk);
102 static void sctp_sock_migrate(struct sock *, struct sock *,
103 struct sctp_association *, sctp_socket_type_t);
105 static int sctp_memory_pressure;
106 static atomic_long_t sctp_memory_allocated;
107 struct percpu_counter sctp_sockets_allocated;
109 static void sctp_enter_memory_pressure(struct sock *sk)
111 sctp_memory_pressure = 1;
115 /* Get the sndbuf space available at the time on the association. */
116 static inline int sctp_wspace(struct sctp_association *asoc)
120 if (asoc->ep->sndbuf_policy)
121 amt = asoc->sndbuf_used;
123 amt = sk_wmem_alloc_get(asoc->base.sk);
125 if (amt >= asoc->base.sk->sk_sndbuf) {
126 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
129 amt = sk_stream_wspace(asoc->base.sk);
134 amt = asoc->base.sk->sk_sndbuf - amt;
139 /* Increment the used sndbuf space count of the corresponding association by
140 * the size of the outgoing data chunk.
141 * Also, set the skb destructor for sndbuf accounting later.
143 * Since it is always 1-1 between chunk and skb, and also a new skb is always
144 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
145 * destructor in the data chunk skb for the purpose of the sndbuf space
148 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
150 struct sctp_association *asoc = chunk->asoc;
151 struct sock *sk = asoc->base.sk;
153 /* The sndbuf space is tracked per association. */
154 sctp_association_hold(asoc);
156 skb_set_owner_w(chunk->skb, sk);
158 chunk->skb->destructor = sctp_wfree;
159 /* Save the chunk pointer in skb for sctp_wfree to use later. */
160 skb_shinfo(chunk->skb)->destructor_arg = chunk;
162 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
163 sizeof(struct sk_buff) +
164 sizeof(struct sctp_chunk);
166 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
167 sk->sk_wmem_queued += chunk->skb->truesize;
168 sk_mem_charge(sk, chunk->skb->truesize);
171 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
173 skb_orphan(chunk->skb);
176 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
177 void (*cb)(struct sctp_chunk *))
180 struct sctp_outq *q = &asoc->outqueue;
181 struct sctp_transport *t;
182 struct sctp_chunk *chunk;
184 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
185 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
188 list_for_each_entry(chunk, &q->retransmit, list)
191 list_for_each_entry(chunk, &q->sacked, list)
194 list_for_each_entry(chunk, &q->abandoned, list)
197 list_for_each_entry(chunk, &q->out_chunk_list, list)
201 /* Verify that this is a valid address. */
202 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
207 /* Verify basic sockaddr. */
208 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
212 /* Is this a valid SCTP address? */
213 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
216 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
222 /* Look up the association by its id. If this is not a UDP-style
223 * socket, the ID field is always ignored.
225 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
227 struct sctp_association *asoc = NULL;
229 /* If this is not a UDP-style socket, assoc id should be ignored. */
230 if (!sctp_style(sk, UDP)) {
231 /* Return NULL if the socket state is not ESTABLISHED. It
232 * could be a TCP-style listening socket or a socket which
233 * hasn't yet called connect() to establish an association.
235 if (!sctp_sstate(sk, ESTABLISHED))
238 /* Get the first and the only association from the list. */
239 if (!list_empty(&sctp_sk(sk)->ep->asocs))
240 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
241 struct sctp_association, asocs);
245 /* Otherwise this is a UDP-style socket. */
246 if (!id || (id == (sctp_assoc_t)-1))
249 spin_lock_bh(&sctp_assocs_id_lock);
250 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
251 spin_unlock_bh(&sctp_assocs_id_lock);
253 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
259 /* Look up the transport from an address and an assoc id. If both address and
260 * id are specified, the associations matching the address and the id should be
263 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
264 struct sockaddr_storage *addr,
267 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
268 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
269 union sctp_addr *laddr = (union sctp_addr *)addr;
270 struct sctp_transport *transport;
272 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
275 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
282 id_asoc = sctp_id2assoc(sk, id);
283 if (id_asoc && (id_asoc != addr_asoc))
286 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
287 (union sctp_addr *)addr);
292 /* API 3.1.2 bind() - UDP Style Syntax
293 * The syntax of bind() is,
295 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
297 * sd - the socket descriptor returned by socket().
298 * addr - the address structure (struct sockaddr_in or struct
299 * sockaddr_in6 [RFC 2553]),
300 * addr_len - the size of the address structure.
302 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
308 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
311 /* Disallow binding twice. */
312 if (!sctp_sk(sk)->ep->base.bind_addr.port)
313 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
323 static long sctp_get_port_local(struct sock *, union sctp_addr *);
325 /* Verify this is a valid sockaddr. */
326 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
327 union sctp_addr *addr, int len)
331 /* Check minimum size. */
332 if (len < sizeof (struct sockaddr))
335 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
338 if (addr->sa.sa_family == AF_INET6) {
339 if (len < SIN6_LEN_RFC2133)
341 /* V4 mapped address are really of AF_INET family */
342 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
343 !opt->pf->af_supported(AF_INET, opt))
347 /* If we get this far, af is valid. */
348 af = sctp_get_af_specific(addr->sa.sa_family);
350 if (len < af->sockaddr_len)
356 /* Bind a local address either to an endpoint or to an association. */
357 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
359 struct net *net = sock_net(sk);
360 struct sctp_sock *sp = sctp_sk(sk);
361 struct sctp_endpoint *ep = sp->ep;
362 struct sctp_bind_addr *bp = &ep->base.bind_addr;
367 /* Common sockaddr verification. */
368 af = sctp_sockaddr_af(sp, addr, len);
370 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
371 __func__, sk, addr, len);
375 snum = ntohs(addr->v4.sin_port);
377 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
378 __func__, sk, &addr->sa, bp->port, snum, len);
380 /* PF specific bind() address verification. */
381 if (!sp->pf->bind_verify(sp, addr))
382 return -EADDRNOTAVAIL;
384 /* We must either be unbound, or bind to the same port.
385 * It's OK to allow 0 ports if we are already bound.
386 * We'll just inhert an already bound port in this case
391 else if (snum != bp->port) {
392 pr_debug("%s: new port %d doesn't match existing port "
393 "%d\n", __func__, snum, bp->port);
398 if (snum && snum < PROT_SOCK &&
399 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
402 /* See if the address matches any of the addresses we may have
403 * already bound before checking against other endpoints.
405 if (sctp_bind_addr_match(bp, addr, sp))
408 /* Make sure we are allowed to bind here.
409 * The function sctp_get_port_local() does duplicate address
412 addr->v4.sin_port = htons(snum);
413 if ((ret = sctp_get_port_local(sk, addr))) {
417 /* Refresh ephemeral port. */
419 bp->port = inet_sk(sk)->inet_num;
421 /* Add the address to the bind address list.
422 * Use GFP_ATOMIC since BHs will be disabled.
424 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
426 /* Copy back into socket for getsockname() use. */
428 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
429 sp->pf->to_sk_saddr(addr, sk);
435 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
437 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
438 * at any one time. If a sender, after sending an ASCONF chunk, decides
439 * it needs to transfer another ASCONF Chunk, it MUST wait until the
440 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
441 * subsequent ASCONF. Note this restriction binds each side, so at any
442 * time two ASCONF may be in-transit on any given association (one sent
443 * from each endpoint).
445 static int sctp_send_asconf(struct sctp_association *asoc,
446 struct sctp_chunk *chunk)
448 struct net *net = sock_net(asoc->base.sk);
451 /* If there is an outstanding ASCONF chunk, queue it for later
454 if (asoc->addip_last_asconf) {
455 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
459 /* Hold the chunk until an ASCONF_ACK is received. */
460 sctp_chunk_hold(chunk);
461 retval = sctp_primitive_ASCONF(net, asoc, chunk);
463 sctp_chunk_free(chunk);
465 asoc->addip_last_asconf = chunk;
471 /* Add a list of addresses as bind addresses to local endpoint or
474 * Basically run through each address specified in the addrs/addrcnt
475 * array/length pair, determine if it is IPv6 or IPv4 and call
476 * sctp_do_bind() on it.
478 * If any of them fails, then the operation will be reversed and the
479 * ones that were added will be removed.
481 * Only sctp_setsockopt_bindx() is supposed to call this function.
483 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
488 struct sockaddr *sa_addr;
491 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
495 for (cnt = 0; cnt < addrcnt; cnt++) {
496 /* The list may contain either IPv4 or IPv6 address;
497 * determine the address length for walking thru the list.
500 af = sctp_get_af_specific(sa_addr->sa_family);
506 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
509 addr_buf += af->sockaddr_len;
513 /* Failed. Cleanup the ones that have been added */
515 sctp_bindx_rem(sk, addrs, cnt);
523 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
524 * associations that are part of the endpoint indicating that a list of local
525 * addresses are added to the endpoint.
527 * If any of the addresses is already in the bind address list of the
528 * association, we do not send the chunk for that association. But it will not
529 * affect other associations.
531 * Only sctp_setsockopt_bindx() is supposed to call this function.
533 static int sctp_send_asconf_add_ip(struct sock *sk,
534 struct sockaddr *addrs,
537 struct net *net = sock_net(sk);
538 struct sctp_sock *sp;
539 struct sctp_endpoint *ep;
540 struct sctp_association *asoc;
541 struct sctp_bind_addr *bp;
542 struct sctp_chunk *chunk;
543 struct sctp_sockaddr_entry *laddr;
544 union sctp_addr *addr;
545 union sctp_addr saveaddr;
552 if (!net->sctp.addip_enable)
558 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
559 __func__, sk, addrs, addrcnt);
561 list_for_each_entry(asoc, &ep->asocs, asocs) {
562 if (!asoc->peer.asconf_capable)
565 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
568 if (!sctp_state(asoc, ESTABLISHED))
571 /* Check if any address in the packed array of addresses is
572 * in the bind address list of the association. If so,
573 * do not send the asconf chunk to its peer, but continue with
574 * other associations.
577 for (i = 0; i < addrcnt; i++) {
579 af = sctp_get_af_specific(addr->v4.sin_family);
585 if (sctp_assoc_lookup_laddr(asoc, addr))
588 addr_buf += af->sockaddr_len;
593 /* Use the first valid address in bind addr list of
594 * association as Address Parameter of ASCONF CHUNK.
596 bp = &asoc->base.bind_addr;
597 p = bp->address_list.next;
598 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
599 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
600 addrcnt, SCTP_PARAM_ADD_IP);
606 /* Add the new addresses to the bind address list with
607 * use_as_src set to 0.
610 for (i = 0; i < addrcnt; i++) {
612 af = sctp_get_af_specific(addr->v4.sin_family);
613 memcpy(&saveaddr, addr, af->sockaddr_len);
614 retval = sctp_add_bind_addr(bp, &saveaddr,
615 SCTP_ADDR_NEW, GFP_ATOMIC);
616 addr_buf += af->sockaddr_len;
618 if (asoc->src_out_of_asoc_ok) {
619 struct sctp_transport *trans;
621 list_for_each_entry(trans,
622 &asoc->peer.transport_addr_list, transports) {
623 /* Clear the source and route cache */
624 dst_release(trans->dst);
625 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
626 2*asoc->pathmtu, 4380));
627 trans->ssthresh = asoc->peer.i.a_rwnd;
628 trans->rto = asoc->rto_initial;
629 sctp_max_rto(asoc, trans);
630 trans->rtt = trans->srtt = trans->rttvar = 0;
631 sctp_transport_route(trans, NULL,
632 sctp_sk(asoc->base.sk));
635 retval = sctp_send_asconf(asoc, chunk);
642 /* Remove a list of addresses from bind addresses list. Do not remove the
645 * Basically run through each address specified in the addrs/addrcnt
646 * array/length pair, determine if it is IPv6 or IPv4 and call
647 * sctp_del_bind() on it.
649 * If any of them fails, then the operation will be reversed and the
650 * ones that were removed will be added back.
652 * At least one address has to be left; if only one address is
653 * available, the operation will return -EBUSY.
655 * Only sctp_setsockopt_bindx() is supposed to call this function.
657 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
659 struct sctp_sock *sp = sctp_sk(sk);
660 struct sctp_endpoint *ep = sp->ep;
662 struct sctp_bind_addr *bp = &ep->base.bind_addr;
665 union sctp_addr *sa_addr;
668 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
669 __func__, sk, addrs, addrcnt);
672 for (cnt = 0; cnt < addrcnt; cnt++) {
673 /* If the bind address list is empty or if there is only one
674 * bind address, there is nothing more to be removed (we need
675 * at least one address here).
677 if (list_empty(&bp->address_list) ||
678 (sctp_list_single_entry(&bp->address_list))) {
684 af = sctp_get_af_specific(sa_addr->sa.sa_family);
690 if (!af->addr_valid(sa_addr, sp, NULL)) {
691 retval = -EADDRNOTAVAIL;
695 if (sa_addr->v4.sin_port &&
696 sa_addr->v4.sin_port != htons(bp->port)) {
701 if (!sa_addr->v4.sin_port)
702 sa_addr->v4.sin_port = htons(bp->port);
704 /* FIXME - There is probably a need to check if sk->sk_saddr and
705 * sk->sk_rcv_addr are currently set to one of the addresses to
706 * be removed. This is something which needs to be looked into
707 * when we are fixing the outstanding issues with multi-homing
708 * socket routing and failover schemes. Refer to comments in
709 * sctp_do_bind(). -daisy
711 retval = sctp_del_bind_addr(bp, sa_addr);
713 addr_buf += af->sockaddr_len;
716 /* Failed. Add the ones that has been removed back */
718 sctp_bindx_add(sk, addrs, cnt);
726 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
727 * the associations that are part of the endpoint indicating that a list of
728 * local addresses are removed from the endpoint.
730 * If any of the addresses is already in the bind address list of the
731 * association, we do not send the chunk for that association. But it will not
732 * affect other associations.
734 * Only sctp_setsockopt_bindx() is supposed to call this function.
736 static int sctp_send_asconf_del_ip(struct sock *sk,
737 struct sockaddr *addrs,
740 struct net *net = sock_net(sk);
741 struct sctp_sock *sp;
742 struct sctp_endpoint *ep;
743 struct sctp_association *asoc;
744 struct sctp_transport *transport;
745 struct sctp_bind_addr *bp;
746 struct sctp_chunk *chunk;
747 union sctp_addr *laddr;
750 struct sctp_sockaddr_entry *saddr;
756 if (!net->sctp.addip_enable)
762 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
763 __func__, sk, addrs, addrcnt);
765 list_for_each_entry(asoc, &ep->asocs, asocs) {
767 if (!asoc->peer.asconf_capable)
770 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
773 if (!sctp_state(asoc, ESTABLISHED))
776 /* Check if any address in the packed array of addresses is
777 * not present in the bind address list of the association.
778 * If so, do not send the asconf chunk to its peer, but
779 * continue with other associations.
782 for (i = 0; i < addrcnt; i++) {
784 af = sctp_get_af_specific(laddr->v4.sin_family);
790 if (!sctp_assoc_lookup_laddr(asoc, laddr))
793 addr_buf += af->sockaddr_len;
798 /* Find one address in the association's bind address list
799 * that is not in the packed array of addresses. This is to
800 * make sure that we do not delete all the addresses in the
803 bp = &asoc->base.bind_addr;
804 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
806 if ((laddr == NULL) && (addrcnt == 1)) {
807 if (asoc->asconf_addr_del_pending)
809 asoc->asconf_addr_del_pending =
810 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
811 if (asoc->asconf_addr_del_pending == NULL) {
815 asoc->asconf_addr_del_pending->sa.sa_family =
817 asoc->asconf_addr_del_pending->v4.sin_port =
819 if (addrs->sa_family == AF_INET) {
820 struct sockaddr_in *sin;
822 sin = (struct sockaddr_in *)addrs;
823 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
824 } else if (addrs->sa_family == AF_INET6) {
825 struct sockaddr_in6 *sin6;
827 sin6 = (struct sockaddr_in6 *)addrs;
828 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
831 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
832 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
833 asoc->asconf_addr_del_pending);
835 asoc->src_out_of_asoc_ok = 1;
843 /* We do not need RCU protection throughout this loop
844 * because this is done under a socket lock from the
847 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
855 /* Reset use_as_src flag for the addresses in the bind address
856 * list that are to be deleted.
859 for (i = 0; i < addrcnt; i++) {
861 af = sctp_get_af_specific(laddr->v4.sin_family);
862 list_for_each_entry(saddr, &bp->address_list, list) {
863 if (sctp_cmp_addr_exact(&saddr->a, laddr))
864 saddr->state = SCTP_ADDR_DEL;
866 addr_buf += af->sockaddr_len;
869 /* Update the route and saddr entries for all the transports
870 * as some of the addresses in the bind address list are
871 * about to be deleted and cannot be used as source addresses.
873 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
875 dst_release(transport->dst);
876 sctp_transport_route(transport, NULL,
877 sctp_sk(asoc->base.sk));
881 /* We don't need to transmit ASCONF */
883 retval = sctp_send_asconf(asoc, chunk);
889 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
890 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
892 struct sock *sk = sctp_opt2sk(sp);
893 union sctp_addr *addr;
896 /* It is safe to write port space in caller. */
898 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
899 af = sctp_get_af_specific(addr->sa.sa_family);
902 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
905 if (addrw->state == SCTP_ADDR_NEW)
906 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
908 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
911 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
914 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
917 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
918 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
921 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
922 * Section 3.1.2 for this usage.
924 * addrs is a pointer to an array of one or more socket addresses. Each
925 * address is contained in its appropriate structure (i.e. struct
926 * sockaddr_in or struct sockaddr_in6) the family of the address type
927 * must be used to distinguish the address length (note that this
928 * representation is termed a "packed array" of addresses). The caller
929 * specifies the number of addresses in the array with addrcnt.
931 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
932 * -1, and sets errno to the appropriate error code.
934 * For SCTP, the port given in each socket address must be the same, or
935 * sctp_bindx() will fail, setting errno to EINVAL.
937 * The flags parameter is formed from the bitwise OR of zero or more of
938 * the following currently defined flags:
940 * SCTP_BINDX_ADD_ADDR
942 * SCTP_BINDX_REM_ADDR
944 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
945 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
946 * addresses from the association. The two flags are mutually exclusive;
947 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
948 * not remove all addresses from an association; sctp_bindx() will
949 * reject such an attempt with EINVAL.
951 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
952 * additional addresses with an endpoint after calling bind(). Or use
953 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
954 * socket is associated with so that no new association accepted will be
955 * associated with those addresses. If the endpoint supports dynamic
956 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
957 * endpoint to send the appropriate message to the peer to change the
958 * peers address lists.
960 * Adding and removing addresses from a connected association is
961 * optional functionality. Implementations that do not support this
962 * functionality should return EOPNOTSUPP.
964 * Basically do nothing but copying the addresses from user to kernel
965 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
966 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
969 * We don't use copy_from_user() for optimization: we first do the
970 * sanity checks (buffer size -fast- and access check-healthy
971 * pointer); if all of those succeed, then we can alloc the memory
972 * (expensive operation) needed to copy the data to kernel. Then we do
973 * the copying without checking the user space area
974 * (__copy_from_user()).
976 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
979 * sk The sk of the socket
980 * addrs The pointer to the addresses in user land
981 * addrssize Size of the addrs buffer
982 * op Operation to perform (add or remove, see the flags of
985 * Returns 0 if ok, <0 errno code on error.
987 static int sctp_setsockopt_bindx(struct sock *sk,
988 struct sockaddr __user *addrs,
989 int addrs_size, int op)
991 struct sockaddr *kaddrs;
995 struct sockaddr *sa_addr;
999 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1000 __func__, sk, addrs, addrs_size, op);
1002 if (unlikely(addrs_size <= 0))
1005 /* Check the user passed a healthy pointer. */
1006 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1009 /* Alloc space for the address array in kernel memory. */
1010 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
1011 if (unlikely(!kaddrs))
1014 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1019 /* Walk through the addrs buffer and count the number of addresses. */
1021 while (walk_size < addrs_size) {
1022 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1028 af = sctp_get_af_specific(sa_addr->sa_family);
1030 /* If the address family is not supported or if this address
1031 * causes the address buffer to overflow return EINVAL.
1033 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1038 addr_buf += af->sockaddr_len;
1039 walk_size += af->sockaddr_len;
1044 case SCTP_BINDX_ADD_ADDR:
1045 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1048 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1051 case SCTP_BINDX_REM_ADDR:
1052 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1055 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1069 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1071 * Common routine for handling connect() and sctp_connectx().
1072 * Connect will come in with just a single address.
1074 static int __sctp_connect(struct sock *sk,
1075 struct sockaddr *kaddrs,
1077 sctp_assoc_t *assoc_id)
1079 struct net *net = sock_net(sk);
1080 struct sctp_sock *sp;
1081 struct sctp_endpoint *ep;
1082 struct sctp_association *asoc = NULL;
1083 struct sctp_association *asoc2;
1084 struct sctp_transport *transport;
1091 union sctp_addr *sa_addr = NULL;
1093 unsigned short port;
1094 unsigned int f_flags = 0;
1099 /* connect() cannot be done on a socket that is already in ESTABLISHED
1100 * state - UDP-style peeled off socket or a TCP-style socket that
1101 * is already connected.
1102 * It cannot be done even on a TCP-style listening socket.
1104 if (sctp_sstate(sk, ESTABLISHED) ||
1105 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1110 /* Walk through the addrs buffer and count the number of addresses. */
1112 while (walk_size < addrs_size) {
1115 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1121 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1123 /* If the address family is not supported or if this address
1124 * causes the address buffer to overflow return EINVAL.
1126 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1131 port = ntohs(sa_addr->v4.sin_port);
1133 /* Save current address so we can work with it */
1134 memcpy(&to, sa_addr, af->sockaddr_len);
1136 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1140 /* Make sure the destination port is correctly set
1143 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1148 /* Check if there already is a matching association on the
1149 * endpoint (other than the one created here).
1151 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1152 if (asoc2 && asoc2 != asoc) {
1153 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1160 /* If we could not find a matching association on the endpoint,
1161 * make sure that there is no peeled-off association matching
1162 * the peer address even on another socket.
1164 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1165 err = -EADDRNOTAVAIL;
1170 /* If a bind() or sctp_bindx() is not called prior to
1171 * an sctp_connectx() call, the system picks an
1172 * ephemeral port and will choose an address set
1173 * equivalent to binding with a wildcard address.
1175 if (!ep->base.bind_addr.port) {
1176 if (sctp_autobind(sk)) {
1182 * If an unprivileged user inherits a 1-many
1183 * style socket with open associations on a
1184 * privileged port, it MAY be permitted to
1185 * accept new associations, but it SHOULD NOT
1186 * be permitted to open new associations.
1188 if (ep->base.bind_addr.port < PROT_SOCK &&
1189 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1195 scope = sctp_scope(&to);
1196 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1202 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1210 /* Prime the peer's transport structures. */
1211 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1219 addr_buf += af->sockaddr_len;
1220 walk_size += af->sockaddr_len;
1223 /* In case the user of sctp_connectx() wants an association
1224 * id back, assign one now.
1227 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1232 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1237 /* Initialize sk's dport and daddr for getpeername() */
1238 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1239 sp->pf->to_sk_daddr(sa_addr, sk);
1242 /* in-kernel sockets don't generally have a file allocated to them
1243 * if all they do is call sock_create_kern().
1245 if (sk->sk_socket->file)
1246 f_flags = sk->sk_socket->file->f_flags;
1248 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1251 *assoc_id = asoc->assoc_id;
1252 err = sctp_wait_for_connect(asoc, &timeo);
1253 /* Note: the asoc may be freed after the return of
1254 * sctp_wait_for_connect.
1257 /* Don't free association on exit. */
1261 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1262 __func__, asoc, kaddrs, err);
1265 /* sctp_primitive_ASSOCIATE may have added this association
1266 * To the hash table, try to unhash it, just in case, its a noop
1267 * if it wasn't hashed so we're safe
1269 sctp_unhash_established(asoc);
1270 sctp_association_free(asoc);
1275 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1278 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1279 * sctp_assoc_t *asoc);
1281 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1282 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1283 * or IPv6 addresses.
1285 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1286 * Section 3.1.2 for this usage.
1288 * addrs is a pointer to an array of one or more socket addresses. Each
1289 * address is contained in its appropriate structure (i.e. struct
1290 * sockaddr_in or struct sockaddr_in6) the family of the address type
1291 * must be used to distengish the address length (note that this
1292 * representation is termed a "packed array" of addresses). The caller
1293 * specifies the number of addresses in the array with addrcnt.
1295 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1296 * the association id of the new association. On failure, sctp_connectx()
1297 * returns -1, and sets errno to the appropriate error code. The assoc_id
1298 * is not touched by the kernel.
1300 * For SCTP, the port given in each socket address must be the same, or
1301 * sctp_connectx() will fail, setting errno to EINVAL.
1303 * An application can use sctp_connectx to initiate an association with
1304 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1305 * allows a caller to specify multiple addresses at which a peer can be
1306 * reached. The way the SCTP stack uses the list of addresses to set up
1307 * the association is implementation dependent. This function only
1308 * specifies that the stack will try to make use of all the addresses in
1309 * the list when needed.
1311 * Note that the list of addresses passed in is only used for setting up
1312 * the association. It does not necessarily equal the set of addresses
1313 * the peer uses for the resulting association. If the caller wants to
1314 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1315 * retrieve them after the association has been set up.
1317 * Basically do nothing but copying the addresses from user to kernel
1318 * land and invoking either sctp_connectx(). This is used for tunneling
1319 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1321 * We don't use copy_from_user() for optimization: we first do the
1322 * sanity checks (buffer size -fast- and access check-healthy
1323 * pointer); if all of those succeed, then we can alloc the memory
1324 * (expensive operation) needed to copy the data to kernel. Then we do
1325 * the copying without checking the user space area
1326 * (__copy_from_user()).
1328 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1331 * sk The sk of the socket
1332 * addrs The pointer to the addresses in user land
1333 * addrssize Size of the addrs buffer
1335 * Returns >=0 if ok, <0 errno code on error.
1337 static int __sctp_setsockopt_connectx(struct sock *sk,
1338 struct sockaddr __user *addrs,
1340 sctp_assoc_t *assoc_id)
1342 struct sockaddr *kaddrs;
1343 gfp_t gfp = GFP_KERNEL;
1346 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1347 __func__, sk, addrs, addrs_size);
1349 if (unlikely(addrs_size <= 0))
1352 /* Check the user passed a healthy pointer. */
1353 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1356 /* Alloc space for the address array in kernel memory. */
1357 if (sk->sk_socket->file)
1358 gfp = GFP_USER | __GFP_NOWARN;
1359 kaddrs = kmalloc(addrs_size, gfp);
1360 if (unlikely(!kaddrs))
1363 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1366 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1375 * This is an older interface. It's kept for backward compatibility
1376 * to the option that doesn't provide association id.
1378 static int sctp_setsockopt_connectx_old(struct sock *sk,
1379 struct sockaddr __user *addrs,
1382 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1386 * New interface for the API. The since the API is done with a socket
1387 * option, to make it simple we feed back the association id is as a return
1388 * indication to the call. Error is always negative and association id is
1391 static int sctp_setsockopt_connectx(struct sock *sk,
1392 struct sockaddr __user *addrs,
1395 sctp_assoc_t assoc_id = 0;
1398 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1407 * New (hopefully final) interface for the API.
1408 * We use the sctp_getaddrs_old structure so that use-space library
1409 * can avoid any unnecessary allocations. The only different part
1410 * is that we store the actual length of the address buffer into the
1411 * addrs_num structure member. That way we can re-use the existing
1414 #ifdef CONFIG_COMPAT
1415 struct compat_sctp_getaddrs_old {
1416 sctp_assoc_t assoc_id;
1418 compat_uptr_t addrs; /* struct sockaddr * */
1422 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1423 char __user *optval,
1426 struct sctp_getaddrs_old param;
1427 sctp_assoc_t assoc_id = 0;
1430 #ifdef CONFIG_COMPAT
1431 if (is_compat_task()) {
1432 struct compat_sctp_getaddrs_old param32;
1434 if (len < sizeof(param32))
1436 if (copy_from_user(¶m32, optval, sizeof(param32)))
1439 param.assoc_id = param32.assoc_id;
1440 param.addr_num = param32.addr_num;
1441 param.addrs = compat_ptr(param32.addrs);
1445 if (len < sizeof(param))
1447 if (copy_from_user(¶m, optval, sizeof(param)))
1451 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1452 param.addrs, param.addr_num,
1454 if (err == 0 || err == -EINPROGRESS) {
1455 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1457 if (put_user(sizeof(assoc_id), optlen))
1464 /* API 3.1.4 close() - UDP Style Syntax
1465 * Applications use close() to perform graceful shutdown (as described in
1466 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1467 * by a UDP-style socket.
1471 * ret = close(int sd);
1473 * sd - the socket descriptor of the associations to be closed.
1475 * To gracefully shutdown a specific association represented by the
1476 * UDP-style socket, an application should use the sendmsg() call,
1477 * passing no user data, but including the appropriate flag in the
1478 * ancillary data (see Section xxxx).
1480 * If sd in the close() call is a branched-off socket representing only
1481 * one association, the shutdown is performed on that association only.
1483 * 4.1.6 close() - TCP Style Syntax
1485 * Applications use close() to gracefully close down an association.
1489 * int close(int sd);
1491 * sd - the socket descriptor of the association to be closed.
1493 * After an application calls close() on a socket descriptor, no further
1494 * socket operations will succeed on that descriptor.
1496 * API 7.1.4 SO_LINGER
1498 * An application using the TCP-style socket can use this option to
1499 * perform the SCTP ABORT primitive. The linger option structure is:
1502 * int l_onoff; // option on/off
1503 * int l_linger; // linger time
1506 * To enable the option, set l_onoff to 1. If the l_linger value is set
1507 * to 0, calling close() is the same as the ABORT primitive. If the
1508 * value is set to a negative value, the setsockopt() call will return
1509 * an error. If the value is set to a positive value linger_time, the
1510 * close() can be blocked for at most linger_time ms. If the graceful
1511 * shutdown phase does not finish during this period, close() will
1512 * return but the graceful shutdown phase continues in the system.
1514 static void sctp_close(struct sock *sk, long timeout)
1516 struct net *net = sock_net(sk);
1517 struct sctp_endpoint *ep;
1518 struct sctp_association *asoc;
1519 struct list_head *pos, *temp;
1520 unsigned int data_was_unread;
1522 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1524 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1525 sk->sk_shutdown = SHUTDOWN_MASK;
1526 sk->sk_state = SCTP_SS_CLOSING;
1528 ep = sctp_sk(sk)->ep;
1530 /* Clean up any skbs sitting on the receive queue. */
1531 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1532 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1534 /* Walk all associations on an endpoint. */
1535 list_for_each_safe(pos, temp, &ep->asocs) {
1536 asoc = list_entry(pos, struct sctp_association, asocs);
1538 if (sctp_style(sk, TCP)) {
1539 /* A closed association can still be in the list if
1540 * it belongs to a TCP-style listening socket that is
1541 * not yet accepted. If so, free it. If not, send an
1542 * ABORT or SHUTDOWN based on the linger options.
1544 if (sctp_state(asoc, CLOSED)) {
1545 sctp_unhash_established(asoc);
1546 sctp_association_free(asoc);
1551 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1552 !skb_queue_empty(&asoc->ulpq.reasm) ||
1553 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1554 struct sctp_chunk *chunk;
1556 chunk = sctp_make_abort_user(asoc, NULL, 0);
1557 sctp_primitive_ABORT(net, asoc, chunk);
1559 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1562 /* On a TCP-style socket, block for at most linger_time if set. */
1563 if (sctp_style(sk, TCP) && timeout)
1564 sctp_wait_for_close(sk, timeout);
1566 /* This will run the backlog queue. */
1569 /* Supposedly, no process has access to the socket, but
1570 * the net layers still may.
1571 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1572 * held and that should be grabbed before socket lock.
1574 spin_lock_bh(&net->sctp.addr_wq_lock);
1575 bh_lock_sock_nested(sk);
1577 /* Hold the sock, since sk_common_release() will put sock_put()
1578 * and we have just a little more cleanup.
1581 sk_common_release(sk);
1584 spin_unlock_bh(&net->sctp.addr_wq_lock);
1588 SCTP_DBG_OBJCNT_DEC(sock);
1591 /* Handle EPIPE error. */
1592 static int sctp_error(struct sock *sk, int flags, int err)
1595 err = sock_error(sk) ? : -EPIPE;
1596 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1597 send_sig(SIGPIPE, current, 0);
1601 /* API 3.1.3 sendmsg() - UDP Style Syntax
1603 * An application uses sendmsg() and recvmsg() calls to transmit data to
1604 * and receive data from its peer.
1606 * ssize_t sendmsg(int socket, const struct msghdr *message,
1609 * socket - the socket descriptor of the endpoint.
1610 * message - pointer to the msghdr structure which contains a single
1611 * user message and possibly some ancillary data.
1613 * See Section 5 for complete description of the data
1616 * flags - flags sent or received with the user message, see Section
1617 * 5 for complete description of the flags.
1619 * Note: This function could use a rewrite especially when explicit
1620 * connect support comes in.
1622 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1624 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1626 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1628 struct net *net = sock_net(sk);
1629 struct sctp_sock *sp;
1630 struct sctp_endpoint *ep;
1631 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1632 struct sctp_transport *transport, *chunk_tp;
1633 struct sctp_chunk *chunk;
1635 struct sockaddr *msg_name = NULL;
1636 struct sctp_sndrcvinfo default_sinfo;
1637 struct sctp_sndrcvinfo *sinfo;
1638 struct sctp_initmsg *sinit;
1639 sctp_assoc_t associd = 0;
1640 sctp_cmsgs_t cmsgs = { NULL };
1642 bool fill_sinfo_ttl = false, wait_connect = false;
1643 struct sctp_datamsg *datamsg;
1644 int msg_flags = msg->msg_flags;
1645 __u16 sinfo_flags = 0;
1653 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1656 /* We cannot send a message over a TCP-style listening socket. */
1657 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1662 /* Parse out the SCTP CMSGs. */
1663 err = sctp_msghdr_parse(msg, &cmsgs);
1665 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1669 /* Fetch the destination address for this packet. This
1670 * address only selects the association--it is not necessarily
1671 * the address we will send to.
1672 * For a peeled-off socket, msg_name is ignored.
1674 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1675 int msg_namelen = msg->msg_namelen;
1677 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1682 if (msg_namelen > sizeof(to))
1683 msg_namelen = sizeof(to);
1684 memcpy(&to, msg->msg_name, msg_namelen);
1685 msg_name = msg->msg_name;
1689 if (cmsgs.sinfo != NULL) {
1690 memset(&default_sinfo, 0, sizeof(default_sinfo));
1691 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1692 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1693 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1694 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1695 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1697 sinfo = &default_sinfo;
1698 fill_sinfo_ttl = true;
1700 sinfo = cmsgs.srinfo;
1702 /* Did the user specify SNDINFO/SNDRCVINFO? */
1704 sinfo_flags = sinfo->sinfo_flags;
1705 associd = sinfo->sinfo_assoc_id;
1708 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1709 msg_len, sinfo_flags);
1711 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1712 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1717 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1718 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1719 * If SCTP_ABORT is set, the message length could be non zero with
1720 * the msg_iov set to the user abort reason.
1722 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1723 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1728 /* If SCTP_ADDR_OVER is set, there must be an address
1729 * specified in msg_name.
1731 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1738 pr_debug("%s: about to look up association\n", __func__);
1742 /* If a msg_name has been specified, assume this is to be used. */
1744 /* Look for a matching association on the endpoint. */
1745 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1747 /* If we could not find a matching association on the
1748 * endpoint, make sure that it is not a TCP-style
1749 * socket that already has an association or there is
1750 * no peeled-off association on another socket.
1752 if ((sctp_style(sk, TCP) &&
1753 sctp_sstate(sk, ESTABLISHED)) ||
1754 sctp_endpoint_is_peeled_off(ep, &to)) {
1755 err = -EADDRNOTAVAIL;
1760 asoc = sctp_id2assoc(sk, associd);
1768 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1770 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1771 * socket that has an association in CLOSED state. This can
1772 * happen when an accepted socket has an association that is
1775 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1780 if (sinfo_flags & SCTP_EOF) {
1781 pr_debug("%s: shutting down association:%p\n",
1784 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1788 if (sinfo_flags & SCTP_ABORT) {
1790 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1796 pr_debug("%s: aborting association:%p\n",
1799 sctp_primitive_ABORT(net, asoc, chunk);
1805 /* Do we need to create the association? */
1807 pr_debug("%s: there is no association yet\n", __func__);
1809 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1814 /* Check for invalid stream against the stream counts,
1815 * either the default or the user specified stream counts.
1818 if (!sinit || !sinit->sinit_num_ostreams) {
1819 /* Check against the defaults. */
1820 if (sinfo->sinfo_stream >=
1821 sp->initmsg.sinit_num_ostreams) {
1826 /* Check against the requested. */
1827 if (sinfo->sinfo_stream >=
1828 sinit->sinit_num_ostreams) {
1836 * API 3.1.2 bind() - UDP Style Syntax
1837 * If a bind() or sctp_bindx() is not called prior to a
1838 * sendmsg() call that initiates a new association, the
1839 * system picks an ephemeral port and will choose an address
1840 * set equivalent to binding with a wildcard address.
1842 if (!ep->base.bind_addr.port) {
1843 if (sctp_autobind(sk)) {
1849 * If an unprivileged user inherits a one-to-many
1850 * style socket with open associations on a privileged
1851 * port, it MAY be permitted to accept new associations,
1852 * but it SHOULD NOT be permitted to open new
1855 if (ep->base.bind_addr.port < PROT_SOCK &&
1856 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1862 scope = sctp_scope(&to);
1863 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1869 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1875 /* If the SCTP_INIT ancillary data is specified, set all
1876 * the association init values accordingly.
1879 if (sinit->sinit_num_ostreams) {
1880 asoc->c.sinit_num_ostreams =
1881 sinit->sinit_num_ostreams;
1883 if (sinit->sinit_max_instreams) {
1884 asoc->c.sinit_max_instreams =
1885 sinit->sinit_max_instreams;
1887 if (sinit->sinit_max_attempts) {
1888 asoc->max_init_attempts
1889 = sinit->sinit_max_attempts;
1891 if (sinit->sinit_max_init_timeo) {
1892 asoc->max_init_timeo =
1893 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1897 /* Prime the peer's transport structures. */
1898 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1905 /* ASSERT: we have a valid association at this point. */
1906 pr_debug("%s: we have a valid association\n", __func__);
1909 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1910 * one with some defaults.
1912 memset(&default_sinfo, 0, sizeof(default_sinfo));
1913 default_sinfo.sinfo_stream = asoc->default_stream;
1914 default_sinfo.sinfo_flags = asoc->default_flags;
1915 default_sinfo.sinfo_ppid = asoc->default_ppid;
1916 default_sinfo.sinfo_context = asoc->default_context;
1917 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1918 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1920 sinfo = &default_sinfo;
1921 } else if (fill_sinfo_ttl) {
1922 /* In case SNDINFO was specified, we still need to fill
1923 * it with a default ttl from the assoc here.
1925 sinfo->sinfo_timetolive = asoc->default_timetolive;
1928 /* API 7.1.7, the sndbuf size per association bounds the
1929 * maximum size of data that can be sent in a single send call.
1931 if (msg_len > sk->sk_sndbuf) {
1936 if (asoc->pmtu_pending)
1937 sctp_assoc_pending_pmtu(sk, asoc);
1939 /* If fragmentation is disabled and the message length exceeds the
1940 * association fragmentation point, return EMSGSIZE. The I-D
1941 * does not specify what this error is, but this looks like
1944 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1949 /* Check for invalid stream. */
1950 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1955 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1956 if (!sctp_wspace(asoc)) {
1957 /* sk can be changed by peel off when waiting for buf. */
1958 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1960 if (err == -ESRCH) {
1961 /* asoc is already dead. */
1969 /* If an address is passed with the sendto/sendmsg call, it is used
1970 * to override the primary destination address in the TCP model, or
1971 * when SCTP_ADDR_OVER flag is set in the UDP model.
1973 if ((sctp_style(sk, TCP) && msg_name) ||
1974 (sinfo_flags & SCTP_ADDR_OVER)) {
1975 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1983 /* Auto-connect, if we aren't connected already. */
1984 if (sctp_state(asoc, CLOSED)) {
1985 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1989 wait_connect = true;
1990 pr_debug("%s: we associated primitively\n", __func__);
1993 /* Break the message into multiple chunks of maximum size. */
1994 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1995 if (IS_ERR(datamsg)) {
1996 err = PTR_ERR(datamsg);
2000 /* Now send the (possibly) fragmented message. */
2001 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2002 /* Do accounting for the write space. */
2003 sctp_set_owner_w(chunk);
2005 chunk->transport = chunk_tp;
2008 /* Send it to the lower layers. Note: all chunks
2009 * must either fail or succeed. The lower layer
2010 * works that way today. Keep it that way or this
2013 err = sctp_primitive_SEND(net, asoc, datamsg);
2014 sctp_datamsg_put(datamsg);
2015 /* Did the lower layer accept the chunk? */
2019 pr_debug("%s: we sent primitively\n", __func__);
2023 if (unlikely(wait_connect)) {
2024 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
2025 sctp_wait_for_connect(asoc, &timeo);
2028 /* If we are already past ASSOCIATE, the lower
2029 * layers are responsible for association cleanup.
2035 sctp_unhash_established(asoc);
2036 sctp_association_free(asoc);
2042 return sctp_error(sk, msg_flags, err);
2049 err = sock_error(sk);
2059 /* This is an extended version of skb_pull() that removes the data from the
2060 * start of a skb even when data is spread across the list of skb's in the
2061 * frag_list. len specifies the total amount of data that needs to be removed.
2062 * when 'len' bytes could be removed from the skb, it returns 0.
2063 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2064 * could not be removed.
2066 static int sctp_skb_pull(struct sk_buff *skb, int len)
2068 struct sk_buff *list;
2069 int skb_len = skb_headlen(skb);
2072 if (len <= skb_len) {
2073 __skb_pull(skb, len);
2077 __skb_pull(skb, skb_len);
2079 skb_walk_frags(skb, list) {
2080 rlen = sctp_skb_pull(list, len);
2081 skb->len -= (len-rlen);
2082 skb->data_len -= (len-rlen);
2093 /* API 3.1.3 recvmsg() - UDP Style Syntax
2095 * ssize_t recvmsg(int socket, struct msghdr *message,
2098 * socket - the socket descriptor of the endpoint.
2099 * message - pointer to the msghdr structure which contains a single
2100 * user message and possibly some ancillary data.
2102 * See Section 5 for complete description of the data
2105 * flags - flags sent or received with the user message, see Section
2106 * 5 for complete description of the flags.
2108 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2109 int noblock, int flags, int *addr_len)
2111 struct sctp_ulpevent *event = NULL;
2112 struct sctp_sock *sp = sctp_sk(sk);
2113 struct sk_buff *skb;
2118 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2119 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2124 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2129 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2133 /* Get the total length of the skb including any skb's in the
2142 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2144 event = sctp_skb2event(skb);
2149 sock_recv_ts_and_drops(msg, sk, skb);
2150 if (sctp_ulpevent_is_notification(event)) {
2151 msg->msg_flags |= MSG_NOTIFICATION;
2152 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2154 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2157 /* Check if we allow SCTP_NXTINFO. */
2158 if (sp->recvnxtinfo)
2159 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2160 /* Check if we allow SCTP_RCVINFO. */
2161 if (sp->recvrcvinfo)
2162 sctp_ulpevent_read_rcvinfo(event, msg);
2163 /* Check if we allow SCTP_SNDRCVINFO. */
2164 if (sp->subscribe.sctp_data_io_event)
2165 sctp_ulpevent_read_sndrcvinfo(event, msg);
2169 /* If skb's length exceeds the user's buffer, update the skb and
2170 * push it back to the receive_queue so that the next call to
2171 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2173 if (skb_len > copied) {
2174 msg->msg_flags &= ~MSG_EOR;
2175 if (flags & MSG_PEEK)
2177 sctp_skb_pull(skb, copied);
2178 skb_queue_head(&sk->sk_receive_queue, skb);
2180 /* When only partial message is copied to the user, increase
2181 * rwnd by that amount. If all the data in the skb is read,
2182 * rwnd is updated when the event is freed.
2184 if (!sctp_ulpevent_is_notification(event))
2185 sctp_assoc_rwnd_increase(event->asoc, copied);
2187 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2188 (event->msg_flags & MSG_EOR))
2189 msg->msg_flags |= MSG_EOR;
2191 msg->msg_flags &= ~MSG_EOR;
2194 if (flags & MSG_PEEK) {
2195 /* Release the skb reference acquired after peeking the skb in
2196 * sctp_skb_recv_datagram().
2200 /* Free the event which includes releasing the reference to
2201 * the owner of the skb, freeing the skb and updating the
2204 sctp_ulpevent_free(event);
2211 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2213 * This option is a on/off flag. If enabled no SCTP message
2214 * fragmentation will be performed. Instead if a message being sent
2215 * exceeds the current PMTU size, the message will NOT be sent and
2216 * instead a error will be indicated to the user.
2218 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2219 char __user *optval,
2220 unsigned int optlen)
2224 if (optlen < sizeof(int))
2227 if (get_user(val, (int __user *)optval))
2230 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2235 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2236 unsigned int optlen)
2238 struct sctp_association *asoc;
2239 struct sctp_ulpevent *event;
2241 if (optlen > sizeof(struct sctp_event_subscribe))
2243 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2246 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2247 * if there is no data to be sent or retransmit, the stack will
2248 * immediately send up this notification.
2250 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2251 &sctp_sk(sk)->subscribe)) {
2252 asoc = sctp_id2assoc(sk, 0);
2254 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2255 event = sctp_ulpevent_make_sender_dry_event(asoc,
2260 sctp_ulpq_tail_event(&asoc->ulpq, event);
2267 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2269 * This socket option is applicable to the UDP-style socket only. When
2270 * set it will cause associations that are idle for more than the
2271 * specified number of seconds to automatically close. An association
2272 * being idle is defined an association that has NOT sent or received
2273 * user data. The special value of '0' indicates that no automatic
2274 * close of any associations should be performed. The option expects an
2275 * integer defining the number of seconds of idle time before an
2276 * association is closed.
2278 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2279 unsigned int optlen)
2281 struct sctp_sock *sp = sctp_sk(sk);
2282 struct net *net = sock_net(sk);
2284 /* Applicable to UDP-style socket only */
2285 if (sctp_style(sk, TCP))
2287 if (optlen != sizeof(int))
2289 if (copy_from_user(&sp->autoclose, optval, optlen))
2292 if (sp->autoclose > net->sctp.max_autoclose)
2293 sp->autoclose = net->sctp.max_autoclose;
2298 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2300 * Applications can enable or disable heartbeats for any peer address of
2301 * an association, modify an address's heartbeat interval, force a
2302 * heartbeat to be sent immediately, and adjust the address's maximum
2303 * number of retransmissions sent before an address is considered
2304 * unreachable. The following structure is used to access and modify an
2305 * address's parameters:
2307 * struct sctp_paddrparams {
2308 * sctp_assoc_t spp_assoc_id;
2309 * struct sockaddr_storage spp_address;
2310 * uint32_t spp_hbinterval;
2311 * uint16_t spp_pathmaxrxt;
2312 * uint32_t spp_pathmtu;
2313 * uint32_t spp_sackdelay;
2314 * uint32_t spp_flags;
2317 * spp_assoc_id - (one-to-many style socket) This is filled in the
2318 * application, and identifies the association for
2320 * spp_address - This specifies which address is of interest.
2321 * spp_hbinterval - This contains the value of the heartbeat interval,
2322 * in milliseconds. If a value of zero
2323 * is present in this field then no changes are to
2324 * be made to this parameter.
2325 * spp_pathmaxrxt - This contains the maximum number of
2326 * retransmissions before this address shall be
2327 * considered unreachable. If a value of zero
2328 * is present in this field then no changes are to
2329 * be made to this parameter.
2330 * spp_pathmtu - When Path MTU discovery is disabled the value
2331 * specified here will be the "fixed" path mtu.
2332 * Note that if the spp_address field is empty
2333 * then all associations on this address will
2334 * have this fixed path mtu set upon them.
2336 * spp_sackdelay - When delayed sack is enabled, this value specifies
2337 * the number of milliseconds that sacks will be delayed
2338 * for. This value will apply to all addresses of an
2339 * association if the spp_address field is empty. Note
2340 * also, that if delayed sack is enabled and this
2341 * value is set to 0, no change is made to the last
2342 * recorded delayed sack timer value.
2344 * spp_flags - These flags are used to control various features
2345 * on an association. The flag field may contain
2346 * zero or more of the following options.
2348 * SPP_HB_ENABLE - Enable heartbeats on the
2349 * specified address. Note that if the address
2350 * field is empty all addresses for the association
2351 * have heartbeats enabled upon them.
2353 * SPP_HB_DISABLE - Disable heartbeats on the
2354 * speicifed address. Note that if the address
2355 * field is empty all addresses for the association
2356 * will have their heartbeats disabled. Note also
2357 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2358 * mutually exclusive, only one of these two should
2359 * be specified. Enabling both fields will have
2360 * undetermined results.
2362 * SPP_HB_DEMAND - Request a user initiated heartbeat
2363 * to be made immediately.
2365 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2366 * heartbeat delayis to be set to the value of 0
2369 * SPP_PMTUD_ENABLE - This field will enable PMTU
2370 * discovery upon the specified address. Note that
2371 * if the address feild is empty then all addresses
2372 * on the association are effected.
2374 * SPP_PMTUD_DISABLE - This field will disable PMTU
2375 * discovery upon the specified address. Note that
2376 * if the address feild is empty then all addresses
2377 * on the association are effected. Not also that
2378 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2379 * exclusive. Enabling both will have undetermined
2382 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2383 * on delayed sack. The time specified in spp_sackdelay
2384 * is used to specify the sack delay for this address. Note
2385 * that if spp_address is empty then all addresses will
2386 * enable delayed sack and take on the sack delay
2387 * value specified in spp_sackdelay.
2388 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2389 * off delayed sack. If the spp_address field is blank then
2390 * delayed sack is disabled for the entire association. Note
2391 * also that this field is mutually exclusive to
2392 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2395 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2396 struct sctp_transport *trans,
2397 struct sctp_association *asoc,
2398 struct sctp_sock *sp,
2401 int sackdelay_change)
2405 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2406 struct net *net = sock_net(trans->asoc->base.sk);
2408 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2413 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2414 * this field is ignored. Note also that a value of zero indicates
2415 * the current setting should be left unchanged.
2417 if (params->spp_flags & SPP_HB_ENABLE) {
2419 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2420 * set. This lets us use 0 value when this flag
2423 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2424 params->spp_hbinterval = 0;
2426 if (params->spp_hbinterval ||
2427 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2430 msecs_to_jiffies(params->spp_hbinterval);
2433 msecs_to_jiffies(params->spp_hbinterval);
2435 sp->hbinterval = params->spp_hbinterval;
2442 trans->param_flags =
2443 (trans->param_flags & ~SPP_HB) | hb_change;
2446 (asoc->param_flags & ~SPP_HB) | hb_change;
2449 (sp->param_flags & ~SPP_HB) | hb_change;
2453 /* When Path MTU discovery is disabled the value specified here will
2454 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2455 * include the flag SPP_PMTUD_DISABLE for this field to have any
2458 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2460 trans->pathmtu = params->spp_pathmtu;
2461 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2463 asoc->pathmtu = params->spp_pathmtu;
2464 sctp_frag_point(asoc, params->spp_pathmtu);
2466 sp->pathmtu = params->spp_pathmtu;
2472 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2473 (params->spp_flags & SPP_PMTUD_ENABLE);
2474 trans->param_flags =
2475 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2477 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2478 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2482 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2485 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2489 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2490 * value of this field is ignored. Note also that a value of zero
2491 * indicates the current setting should be left unchanged.
2493 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2496 msecs_to_jiffies(params->spp_sackdelay);
2499 msecs_to_jiffies(params->spp_sackdelay);
2501 sp->sackdelay = params->spp_sackdelay;
2505 if (sackdelay_change) {
2507 trans->param_flags =
2508 (trans->param_flags & ~SPP_SACKDELAY) |
2512 (asoc->param_flags & ~SPP_SACKDELAY) |
2516 (sp->param_flags & ~SPP_SACKDELAY) |
2521 /* Note that a value of zero indicates the current setting should be
2524 if (params->spp_pathmaxrxt) {
2526 trans->pathmaxrxt = params->spp_pathmaxrxt;
2528 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2530 sp->pathmaxrxt = params->spp_pathmaxrxt;
2537 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2538 char __user *optval,
2539 unsigned int optlen)
2541 struct sctp_paddrparams params;
2542 struct sctp_transport *trans = NULL;
2543 struct sctp_association *asoc = NULL;
2544 struct sctp_sock *sp = sctp_sk(sk);
2546 int hb_change, pmtud_change, sackdelay_change;
2548 if (optlen != sizeof(struct sctp_paddrparams))
2551 if (copy_from_user(¶ms, optval, optlen))
2554 /* Validate flags and value parameters. */
2555 hb_change = params.spp_flags & SPP_HB;
2556 pmtud_change = params.spp_flags & SPP_PMTUD;
2557 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2559 if (hb_change == SPP_HB ||
2560 pmtud_change == SPP_PMTUD ||
2561 sackdelay_change == SPP_SACKDELAY ||
2562 params.spp_sackdelay > 500 ||
2563 (params.spp_pathmtu &&
2564 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2567 /* If an address other than INADDR_ANY is specified, and
2568 * no transport is found, then the request is invalid.
2570 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2571 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2572 params.spp_assoc_id);
2577 /* Get association, if assoc_id != 0 and the socket is a one
2578 * to many style socket, and an association was not found, then
2579 * the id was invalid.
2581 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2582 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2585 /* Heartbeat demand can only be sent on a transport or
2586 * association, but not a socket.
2588 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2591 /* Process parameters. */
2592 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2593 hb_change, pmtud_change,
2599 /* If changes are for association, also apply parameters to each
2602 if (!trans && asoc) {
2603 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2605 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2606 hb_change, pmtud_change,
2614 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2616 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2619 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2621 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2625 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2627 * This option will effect the way delayed acks are performed. This
2628 * option allows you to get or set the delayed ack time, in
2629 * milliseconds. It also allows changing the delayed ack frequency.
2630 * Changing the frequency to 1 disables the delayed sack algorithm. If
2631 * the assoc_id is 0, then this sets or gets the endpoints default
2632 * values. If the assoc_id field is non-zero, then the set or get
2633 * effects the specified association for the one to many model (the
2634 * assoc_id field is ignored by the one to one model). Note that if
2635 * sack_delay or sack_freq are 0 when setting this option, then the
2636 * current values will remain unchanged.
2638 * struct sctp_sack_info {
2639 * sctp_assoc_t sack_assoc_id;
2640 * uint32_t sack_delay;
2641 * uint32_t sack_freq;
2644 * sack_assoc_id - This parameter, indicates which association the user
2645 * is performing an action upon. Note that if this field's value is
2646 * zero then the endpoints default value is changed (effecting future
2647 * associations only).
2649 * sack_delay - This parameter contains the number of milliseconds that
2650 * the user is requesting the delayed ACK timer be set to. Note that
2651 * this value is defined in the standard to be between 200 and 500
2654 * sack_freq - This parameter contains the number of packets that must
2655 * be received before a sack is sent without waiting for the delay
2656 * timer to expire. The default value for this is 2, setting this
2657 * value to 1 will disable the delayed sack algorithm.
2660 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2661 char __user *optval, unsigned int optlen)
2663 struct sctp_sack_info params;
2664 struct sctp_transport *trans = NULL;
2665 struct sctp_association *asoc = NULL;
2666 struct sctp_sock *sp = sctp_sk(sk);
2668 if (optlen == sizeof(struct sctp_sack_info)) {
2669 if (copy_from_user(¶ms, optval, optlen))
2672 if (params.sack_delay == 0 && params.sack_freq == 0)
2674 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2675 pr_warn_ratelimited(DEPRECATED
2677 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2678 "Use struct sctp_sack_info instead\n",
2679 current->comm, task_pid_nr(current));
2680 if (copy_from_user(¶ms, optval, optlen))
2683 if (params.sack_delay == 0)
2684 params.sack_freq = 1;
2686 params.sack_freq = 0;
2690 /* Validate value parameter. */
2691 if (params.sack_delay > 500)
2694 /* Get association, if sack_assoc_id != 0 and the socket is a one
2695 * to many style socket, and an association was not found, then
2696 * the id was invalid.
2698 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2699 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2702 if (params.sack_delay) {
2705 msecs_to_jiffies(params.sack_delay);
2707 sctp_spp_sackdelay_enable(asoc->param_flags);
2709 sp->sackdelay = params.sack_delay;
2711 sctp_spp_sackdelay_enable(sp->param_flags);
2715 if (params.sack_freq == 1) {
2718 sctp_spp_sackdelay_disable(asoc->param_flags);
2721 sctp_spp_sackdelay_disable(sp->param_flags);
2723 } else if (params.sack_freq > 1) {
2725 asoc->sackfreq = params.sack_freq;
2727 sctp_spp_sackdelay_enable(asoc->param_flags);
2729 sp->sackfreq = params.sack_freq;
2731 sctp_spp_sackdelay_enable(sp->param_flags);
2735 /* If change is for association, also apply to each transport. */
2737 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2739 if (params.sack_delay) {
2741 msecs_to_jiffies(params.sack_delay);
2742 trans->param_flags =
2743 sctp_spp_sackdelay_enable(trans->param_flags);
2745 if (params.sack_freq == 1) {
2746 trans->param_flags =
2747 sctp_spp_sackdelay_disable(trans->param_flags);
2748 } else if (params.sack_freq > 1) {
2749 trans->sackfreq = params.sack_freq;
2750 trans->param_flags =
2751 sctp_spp_sackdelay_enable(trans->param_flags);
2759 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2761 * Applications can specify protocol parameters for the default association
2762 * initialization. The option name argument to setsockopt() and getsockopt()
2765 * Setting initialization parameters is effective only on an unconnected
2766 * socket (for UDP-style sockets only future associations are effected
2767 * by the change). With TCP-style sockets, this option is inherited by
2768 * sockets derived from a listener socket.
2770 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2772 struct sctp_initmsg sinit;
2773 struct sctp_sock *sp = sctp_sk(sk);
2775 if (optlen != sizeof(struct sctp_initmsg))
2777 if (copy_from_user(&sinit, optval, optlen))
2780 if (sinit.sinit_num_ostreams)
2781 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2782 if (sinit.sinit_max_instreams)
2783 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2784 if (sinit.sinit_max_attempts)
2785 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2786 if (sinit.sinit_max_init_timeo)
2787 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2793 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2795 * Applications that wish to use the sendto() system call may wish to
2796 * specify a default set of parameters that would normally be supplied
2797 * through the inclusion of ancillary data. This socket option allows
2798 * such an application to set the default sctp_sndrcvinfo structure.
2799 * The application that wishes to use this socket option simply passes
2800 * in to this call the sctp_sndrcvinfo structure defined in Section
2801 * 5.2.2) The input parameters accepted by this call include
2802 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2803 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2804 * to this call if the caller is using the UDP model.
2806 static int sctp_setsockopt_default_send_param(struct sock *sk,
2807 char __user *optval,
2808 unsigned int optlen)
2810 struct sctp_sock *sp = sctp_sk(sk);
2811 struct sctp_association *asoc;
2812 struct sctp_sndrcvinfo info;
2814 if (optlen != sizeof(info))
2816 if (copy_from_user(&info, optval, optlen))
2818 if (info.sinfo_flags &
2819 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2820 SCTP_ABORT | SCTP_EOF))
2823 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2824 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2827 asoc->default_stream = info.sinfo_stream;
2828 asoc->default_flags = info.sinfo_flags;
2829 asoc->default_ppid = info.sinfo_ppid;
2830 asoc->default_context = info.sinfo_context;
2831 asoc->default_timetolive = info.sinfo_timetolive;
2833 sp->default_stream = info.sinfo_stream;
2834 sp->default_flags = info.sinfo_flags;
2835 sp->default_ppid = info.sinfo_ppid;
2836 sp->default_context = info.sinfo_context;
2837 sp->default_timetolive = info.sinfo_timetolive;
2843 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2844 * (SCTP_DEFAULT_SNDINFO)
2846 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2847 char __user *optval,
2848 unsigned int optlen)
2850 struct sctp_sock *sp = sctp_sk(sk);
2851 struct sctp_association *asoc;
2852 struct sctp_sndinfo info;
2854 if (optlen != sizeof(info))
2856 if (copy_from_user(&info, optval, optlen))
2858 if (info.snd_flags &
2859 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2860 SCTP_ABORT | SCTP_EOF))
2863 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2864 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2867 asoc->default_stream = info.snd_sid;
2868 asoc->default_flags = info.snd_flags;
2869 asoc->default_ppid = info.snd_ppid;
2870 asoc->default_context = info.snd_context;
2872 sp->default_stream = info.snd_sid;
2873 sp->default_flags = info.snd_flags;
2874 sp->default_ppid = info.snd_ppid;
2875 sp->default_context = info.snd_context;
2881 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2883 * Requests that the local SCTP stack use the enclosed peer address as
2884 * the association primary. The enclosed address must be one of the
2885 * association peer's addresses.
2887 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2888 unsigned int optlen)
2890 struct sctp_prim prim;
2891 struct sctp_transport *trans;
2893 if (optlen != sizeof(struct sctp_prim))
2896 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2899 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2903 sctp_assoc_set_primary(trans->asoc, trans);
2909 * 7.1.5 SCTP_NODELAY
2911 * Turn on/off any Nagle-like algorithm. This means that packets are
2912 * generally sent as soon as possible and no unnecessary delays are
2913 * introduced, at the cost of more packets in the network. Expects an
2914 * integer boolean flag.
2916 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2917 unsigned int optlen)
2921 if (optlen < sizeof(int))
2923 if (get_user(val, (int __user *)optval))
2926 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2932 * 7.1.1 SCTP_RTOINFO
2934 * The protocol parameters used to initialize and bound retransmission
2935 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2936 * and modify these parameters.
2937 * All parameters are time values, in milliseconds. A value of 0, when
2938 * modifying the parameters, indicates that the current value should not
2942 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2944 struct sctp_rtoinfo rtoinfo;
2945 struct sctp_association *asoc;
2946 unsigned long rto_min, rto_max;
2947 struct sctp_sock *sp = sctp_sk(sk);
2949 if (optlen != sizeof (struct sctp_rtoinfo))
2952 if (copy_from_user(&rtoinfo, optval, optlen))
2955 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2957 /* Set the values to the specific association */
2958 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2961 rto_max = rtoinfo.srto_max;
2962 rto_min = rtoinfo.srto_min;
2965 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2967 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2970 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2972 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2974 if (rto_min > rto_max)
2978 if (rtoinfo.srto_initial != 0)
2980 msecs_to_jiffies(rtoinfo.srto_initial);
2981 asoc->rto_max = rto_max;
2982 asoc->rto_min = rto_min;
2984 /* If there is no association or the association-id = 0
2985 * set the values to the endpoint.
2987 if (rtoinfo.srto_initial != 0)
2988 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2989 sp->rtoinfo.srto_max = rto_max;
2990 sp->rtoinfo.srto_min = rto_min;
2998 * 7.1.2 SCTP_ASSOCINFO
3000 * This option is used to tune the maximum retransmission attempts
3001 * of the association.
3002 * Returns an error if the new association retransmission value is
3003 * greater than the sum of the retransmission value of the peer.
3004 * See [SCTP] for more information.
3007 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3010 struct sctp_assocparams assocparams;
3011 struct sctp_association *asoc;
3013 if (optlen != sizeof(struct sctp_assocparams))
3015 if (copy_from_user(&assocparams, optval, optlen))
3018 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3020 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3023 /* Set the values to the specific association */
3025 if (assocparams.sasoc_asocmaxrxt != 0) {
3028 struct sctp_transport *peer_addr;
3030 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3032 path_sum += peer_addr->pathmaxrxt;
3036 /* Only validate asocmaxrxt if we have more than
3037 * one path/transport. We do this because path
3038 * retransmissions are only counted when we have more
3042 assocparams.sasoc_asocmaxrxt > path_sum)
3045 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3048 if (assocparams.sasoc_cookie_life != 0)
3049 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3051 /* Set the values to the endpoint */
3052 struct sctp_sock *sp = sctp_sk(sk);
3054 if (assocparams.sasoc_asocmaxrxt != 0)
3055 sp->assocparams.sasoc_asocmaxrxt =
3056 assocparams.sasoc_asocmaxrxt;
3057 if (assocparams.sasoc_cookie_life != 0)
3058 sp->assocparams.sasoc_cookie_life =
3059 assocparams.sasoc_cookie_life;
3065 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3067 * This socket option is a boolean flag which turns on or off mapped V4
3068 * addresses. If this option is turned on and the socket is type
3069 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3070 * If this option is turned off, then no mapping will be done of V4
3071 * addresses and a user will receive both PF_INET6 and PF_INET type
3072 * addresses on the socket.
3074 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3077 struct sctp_sock *sp = sctp_sk(sk);
3079 if (optlen < sizeof(int))
3081 if (get_user(val, (int __user *)optval))
3092 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3093 * This option will get or set the maximum size to put in any outgoing
3094 * SCTP DATA chunk. If a message is larger than this size it will be
3095 * fragmented by SCTP into the specified size. Note that the underlying
3096 * SCTP implementation may fragment into smaller sized chunks when the
3097 * PMTU of the underlying association is smaller than the value set by
3098 * the user. The default value for this option is '0' which indicates
3099 * the user is NOT limiting fragmentation and only the PMTU will effect
3100 * SCTP's choice of DATA chunk size. Note also that values set larger
3101 * than the maximum size of an IP datagram will effectively let SCTP
3102 * control fragmentation (i.e. the same as setting this option to 0).
3104 * The following structure is used to access and modify this parameter:
3106 * struct sctp_assoc_value {
3107 * sctp_assoc_t assoc_id;
3108 * uint32_t assoc_value;
3111 * assoc_id: This parameter is ignored for one-to-one style sockets.
3112 * For one-to-many style sockets this parameter indicates which
3113 * association the user is performing an action upon. Note that if
3114 * this field's value is zero then the endpoints default value is
3115 * changed (effecting future associations only).
3116 * assoc_value: This parameter specifies the maximum size in bytes.
3118 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3120 struct sctp_assoc_value params;
3121 struct sctp_association *asoc;
3122 struct sctp_sock *sp = sctp_sk(sk);
3125 if (optlen == sizeof(int)) {
3126 pr_warn_ratelimited(DEPRECATED
3128 "Use of int in maxseg socket option.\n"
3129 "Use struct sctp_assoc_value instead\n",
3130 current->comm, task_pid_nr(current));
3131 if (copy_from_user(&val, optval, optlen))
3133 params.assoc_id = 0;
3134 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3135 if (copy_from_user(¶ms, optval, optlen))
3137 val = params.assoc_value;
3141 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3144 asoc = sctp_id2assoc(sk, params.assoc_id);
3145 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3150 val = asoc->pathmtu;
3151 val -= sp->pf->af->net_header_len;
3152 val -= sizeof(struct sctphdr) +
3153 sizeof(struct sctp_data_chunk);
3155 asoc->user_frag = val;
3156 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3158 sp->user_frag = val;
3166 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3168 * Requests that the peer mark the enclosed address as the association
3169 * primary. The enclosed address must be one of the association's
3170 * locally bound addresses. The following structure is used to make a
3171 * set primary request:
3173 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3174 unsigned int optlen)
3176 struct net *net = sock_net(sk);
3177 struct sctp_sock *sp;
3178 struct sctp_association *asoc = NULL;
3179 struct sctp_setpeerprim prim;
3180 struct sctp_chunk *chunk;
3186 if (!net->sctp.addip_enable)
3189 if (optlen != sizeof(struct sctp_setpeerprim))
3192 if (copy_from_user(&prim, optval, optlen))
3195 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3199 if (!asoc->peer.asconf_capable)
3202 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3205 if (!sctp_state(asoc, ESTABLISHED))
3208 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3212 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3213 return -EADDRNOTAVAIL;
3215 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3216 return -EADDRNOTAVAIL;
3218 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3219 chunk = sctp_make_asconf_set_prim(asoc,
3220 (union sctp_addr *)&prim.sspp_addr);
3224 err = sctp_send_asconf(asoc, chunk);
3226 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3231 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3232 unsigned int optlen)
3234 struct sctp_setadaptation adaptation;
3236 if (optlen != sizeof(struct sctp_setadaptation))
3238 if (copy_from_user(&adaptation, optval, optlen))
3241 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3247 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3249 * The context field in the sctp_sndrcvinfo structure is normally only
3250 * used when a failed message is retrieved holding the value that was
3251 * sent down on the actual send call. This option allows the setting of
3252 * a default context on an association basis that will be received on
3253 * reading messages from the peer. This is especially helpful in the
3254 * one-2-many model for an application to keep some reference to an
3255 * internal state machine that is processing messages on the
3256 * association. Note that the setting of this value only effects
3257 * received messages from the peer and does not effect the value that is
3258 * saved with outbound messages.
3260 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3261 unsigned int optlen)
3263 struct sctp_assoc_value params;
3264 struct sctp_sock *sp;
3265 struct sctp_association *asoc;
3267 if (optlen != sizeof(struct sctp_assoc_value))
3269 if (copy_from_user(¶ms, optval, optlen))
3274 if (params.assoc_id != 0) {
3275 asoc = sctp_id2assoc(sk, params.assoc_id);
3278 asoc->default_rcv_context = params.assoc_value;
3280 sp->default_rcv_context = params.assoc_value;
3287 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3289 * This options will at a minimum specify if the implementation is doing
3290 * fragmented interleave. Fragmented interleave, for a one to many
3291 * socket, is when subsequent calls to receive a message may return
3292 * parts of messages from different associations. Some implementations
3293 * may allow you to turn this value on or off. If so, when turned off,
3294 * no fragment interleave will occur (which will cause a head of line
3295 * blocking amongst multiple associations sharing the same one to many
3296 * socket). When this option is turned on, then each receive call may
3297 * come from a different association (thus the user must receive data
3298 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3299 * association each receive belongs to.
3301 * This option takes a boolean value. A non-zero value indicates that
3302 * fragmented interleave is on. A value of zero indicates that
3303 * fragmented interleave is off.
3305 * Note that it is important that an implementation that allows this
3306 * option to be turned on, have it off by default. Otherwise an unaware
3307 * application using the one to many model may become confused and act
3310 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3311 char __user *optval,
3312 unsigned int optlen)
3316 if (optlen != sizeof(int))
3318 if (get_user(val, (int __user *)optval))
3321 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3327 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3328 * (SCTP_PARTIAL_DELIVERY_POINT)
3330 * This option will set or get the SCTP partial delivery point. This
3331 * point is the size of a message where the partial delivery API will be
3332 * invoked to help free up rwnd space for the peer. Setting this to a
3333 * lower value will cause partial deliveries to happen more often. The
3334 * calls argument is an integer that sets or gets the partial delivery
3335 * point. Note also that the call will fail if the user attempts to set
3336 * this value larger than the socket receive buffer size.
3338 * Note that any single message having a length smaller than or equal to
3339 * the SCTP partial delivery point will be delivered in one single read
3340 * call as long as the user provided buffer is large enough to hold the
3343 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3344 char __user *optval,
3345 unsigned int optlen)
3349 if (optlen != sizeof(u32))
3351 if (get_user(val, (int __user *)optval))
3354 /* Note: We double the receive buffer from what the user sets
3355 * it to be, also initial rwnd is based on rcvbuf/2.
3357 if (val > (sk->sk_rcvbuf >> 1))
3360 sctp_sk(sk)->pd_point = val;
3362 return 0; /* is this the right error code? */
3366 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3368 * This option will allow a user to change the maximum burst of packets
3369 * that can be emitted by this association. Note that the default value
3370 * is 4, and some implementations may restrict this setting so that it
3371 * can only be lowered.
3373 * NOTE: This text doesn't seem right. Do this on a socket basis with
3374 * future associations inheriting the socket value.
3376 static int sctp_setsockopt_maxburst(struct sock *sk,
3377 char __user *optval,
3378 unsigned int optlen)
3380 struct sctp_assoc_value params;
3381 struct sctp_sock *sp;
3382 struct sctp_association *asoc;
3386 if (optlen == sizeof(int)) {
3387 pr_warn_ratelimited(DEPRECATED
3389 "Use of int in max_burst socket option deprecated.\n"
3390 "Use struct sctp_assoc_value instead\n",
3391 current->comm, task_pid_nr(current));
3392 if (copy_from_user(&val, optval, optlen))
3394 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3395 if (copy_from_user(¶ms, optval, optlen))
3397 val = params.assoc_value;
3398 assoc_id = params.assoc_id;
3404 if (assoc_id != 0) {
3405 asoc = sctp_id2assoc(sk, assoc_id);
3408 asoc->max_burst = val;
3410 sp->max_burst = val;
3416 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3418 * This set option adds a chunk type that the user is requesting to be
3419 * received only in an authenticated way. Changes to the list of chunks
3420 * will only effect future associations on the socket.
3422 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3423 char __user *optval,
3424 unsigned int optlen)
3426 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3427 struct sctp_authchunk val;
3429 if (!ep->auth_enable)
3432 if (optlen != sizeof(struct sctp_authchunk))
3434 if (copy_from_user(&val, optval, optlen))
3437 switch (val.sauth_chunk) {
3439 case SCTP_CID_INIT_ACK:
3440 case SCTP_CID_SHUTDOWN_COMPLETE:
3445 /* add this chunk id to the endpoint */
3446 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3450 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3452 * This option gets or sets the list of HMAC algorithms that the local
3453 * endpoint requires the peer to use.
3455 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3456 char __user *optval,
3457 unsigned int optlen)
3459 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3460 struct sctp_hmacalgo *hmacs;
3464 if (!ep->auth_enable)
3467 if (optlen < sizeof(struct sctp_hmacalgo))
3470 hmacs = memdup_user(optval, optlen);
3472 return PTR_ERR(hmacs);
3474 idents = hmacs->shmac_num_idents;
3475 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3476 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3481 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3488 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3490 * This option will set a shared secret key which is used to build an
3491 * association shared key.
3493 static int sctp_setsockopt_auth_key(struct sock *sk,
3494 char __user *optval,
3495 unsigned int optlen)
3497 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3498 struct sctp_authkey *authkey;
3499 struct sctp_association *asoc;
3502 if (!ep->auth_enable)
3505 if (optlen <= sizeof(struct sctp_authkey))
3508 authkey = memdup_user(optval, optlen);
3509 if (IS_ERR(authkey))
3510 return PTR_ERR(authkey);
3512 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3517 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3518 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3523 ret = sctp_auth_set_key(ep, asoc, authkey);
3530 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3532 * This option will get or set the active shared key to be used to build
3533 * the association shared key.
3535 static int sctp_setsockopt_active_key(struct sock *sk,
3536 char __user *optval,
3537 unsigned int optlen)
3539 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3540 struct sctp_authkeyid val;
3541 struct sctp_association *asoc;
3543 if (!ep->auth_enable)
3546 if (optlen != sizeof(struct sctp_authkeyid))
3548 if (copy_from_user(&val, optval, optlen))
3551 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3552 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3555 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3559 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3561 * This set option will delete a shared secret key from use.
3563 static int sctp_setsockopt_del_key(struct sock *sk,
3564 char __user *optval,
3565 unsigned int optlen)
3567 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3568 struct sctp_authkeyid val;
3569 struct sctp_association *asoc;
3571 if (!ep->auth_enable)
3574 if (optlen != sizeof(struct sctp_authkeyid))
3576 if (copy_from_user(&val, optval, optlen))
3579 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3580 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3583 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3588 * 8.1.23 SCTP_AUTO_ASCONF
3590 * This option will enable or disable the use of the automatic generation of
3591 * ASCONF chunks to add and delete addresses to an existing association. Note
3592 * that this option has two caveats namely: a) it only affects sockets that
3593 * are bound to all addresses available to the SCTP stack, and b) the system
3594 * administrator may have an overriding control that turns the ASCONF feature
3595 * off no matter what setting the socket option may have.
3596 * This option expects an integer boolean flag, where a non-zero value turns on
3597 * the option, and a zero value turns off the option.
3598 * Note. In this implementation, socket operation overrides default parameter
3599 * being set by sysctl as well as FreeBSD implementation
3601 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3602 unsigned int optlen)
3605 struct sctp_sock *sp = sctp_sk(sk);
3607 if (optlen < sizeof(int))
3609 if (get_user(val, (int __user *)optval))
3611 if (!sctp_is_ep_boundall(sk) && val)
3613 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3616 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3617 if (val == 0 && sp->do_auto_asconf) {
3618 list_del(&sp->auto_asconf_list);
3619 sp->do_auto_asconf = 0;
3620 } else if (val && !sp->do_auto_asconf) {
3621 list_add_tail(&sp->auto_asconf_list,
3622 &sock_net(sk)->sctp.auto_asconf_splist);
3623 sp->do_auto_asconf = 1;
3625 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3630 * SCTP_PEER_ADDR_THLDS
3632 * This option allows us to alter the partially failed threshold for one or all
3633 * transports in an association. See Section 6.1 of:
3634 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3636 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3637 char __user *optval,
3638 unsigned int optlen)
3640 struct sctp_paddrthlds val;
3641 struct sctp_transport *trans;
3642 struct sctp_association *asoc;
3644 if (optlen < sizeof(struct sctp_paddrthlds))
3646 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3647 sizeof(struct sctp_paddrthlds)))
3651 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3652 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3655 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3657 if (val.spt_pathmaxrxt)
3658 trans->pathmaxrxt = val.spt_pathmaxrxt;
3659 trans->pf_retrans = val.spt_pathpfthld;
3662 if (val.spt_pathmaxrxt)
3663 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3664 asoc->pf_retrans = val.spt_pathpfthld;
3666 trans = sctp_addr_id2transport(sk, &val.spt_address,
3671 if (val.spt_pathmaxrxt)
3672 trans->pathmaxrxt = val.spt_pathmaxrxt;
3673 trans->pf_retrans = val.spt_pathpfthld;
3679 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3680 char __user *optval,
3681 unsigned int optlen)
3685 if (optlen < sizeof(int))
3687 if (get_user(val, (int __user *) optval))
3690 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3695 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3696 char __user *optval,
3697 unsigned int optlen)
3701 if (optlen < sizeof(int))
3703 if (get_user(val, (int __user *) optval))
3706 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3711 /* API 6.2 setsockopt(), getsockopt()
3713 * Applications use setsockopt() and getsockopt() to set or retrieve
3714 * socket options. Socket options are used to change the default
3715 * behavior of sockets calls. They are described in Section 7.
3719 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3720 * int __user *optlen);
3721 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3724 * sd - the socket descript.
3725 * level - set to IPPROTO_SCTP for all SCTP options.
3726 * optname - the option name.
3727 * optval - the buffer to store the value of the option.
3728 * optlen - the size of the buffer.
3730 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3731 char __user *optval, unsigned int optlen)
3735 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3737 /* I can hardly begin to describe how wrong this is. This is
3738 * so broken as to be worse than useless. The API draft
3739 * REALLY is NOT helpful here... I am not convinced that the
3740 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3741 * are at all well-founded.
3743 if (level != SOL_SCTP) {
3744 struct sctp_af *af = sctp_sk(sk)->pf->af;
3745 retval = af->setsockopt(sk, level, optname, optval, optlen);
3752 case SCTP_SOCKOPT_BINDX_ADD:
3753 /* 'optlen' is the size of the addresses buffer. */
3754 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3755 optlen, SCTP_BINDX_ADD_ADDR);
3758 case SCTP_SOCKOPT_BINDX_REM:
3759 /* 'optlen' is the size of the addresses buffer. */
3760 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3761 optlen, SCTP_BINDX_REM_ADDR);
3764 case SCTP_SOCKOPT_CONNECTX_OLD:
3765 /* 'optlen' is the size of the addresses buffer. */
3766 retval = sctp_setsockopt_connectx_old(sk,
3767 (struct sockaddr __user *)optval,
3771 case SCTP_SOCKOPT_CONNECTX:
3772 /* 'optlen' is the size of the addresses buffer. */
3773 retval = sctp_setsockopt_connectx(sk,
3774 (struct sockaddr __user *)optval,
3778 case SCTP_DISABLE_FRAGMENTS:
3779 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3783 retval = sctp_setsockopt_events(sk, optval, optlen);
3786 case SCTP_AUTOCLOSE:
3787 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3790 case SCTP_PEER_ADDR_PARAMS:
3791 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3794 case SCTP_DELAYED_SACK:
3795 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3797 case SCTP_PARTIAL_DELIVERY_POINT:
3798 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3802 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3804 case SCTP_DEFAULT_SEND_PARAM:
3805 retval = sctp_setsockopt_default_send_param(sk, optval,
3808 case SCTP_DEFAULT_SNDINFO:
3809 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3811 case SCTP_PRIMARY_ADDR:
3812 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3814 case SCTP_SET_PEER_PRIMARY_ADDR:
3815 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3818 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3821 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3823 case SCTP_ASSOCINFO:
3824 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3826 case SCTP_I_WANT_MAPPED_V4_ADDR:
3827 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3830 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3832 case SCTP_ADAPTATION_LAYER:
3833 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3836 retval = sctp_setsockopt_context(sk, optval, optlen);
3838 case SCTP_FRAGMENT_INTERLEAVE:
3839 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3841 case SCTP_MAX_BURST:
3842 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3844 case SCTP_AUTH_CHUNK:
3845 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3847 case SCTP_HMAC_IDENT:
3848 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3851 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3853 case SCTP_AUTH_ACTIVE_KEY:
3854 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3856 case SCTP_AUTH_DELETE_KEY:
3857 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3859 case SCTP_AUTO_ASCONF:
3860 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3862 case SCTP_PEER_ADDR_THLDS:
3863 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3865 case SCTP_RECVRCVINFO:
3866 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3868 case SCTP_RECVNXTINFO:
3869 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3872 retval = -ENOPROTOOPT;
3882 /* API 3.1.6 connect() - UDP Style Syntax
3884 * An application may use the connect() call in the UDP model to initiate an
3885 * association without sending data.
3889 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3891 * sd: the socket descriptor to have a new association added to.
3893 * nam: the address structure (either struct sockaddr_in or struct
3894 * sockaddr_in6 defined in RFC2553 [7]).
3896 * len: the size of the address.
3898 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3906 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3909 /* Validate addr_len before calling common connect/connectx routine. */
3910 af = sctp_get_af_specific(addr->sa_family);
3911 if (!af || addr_len < af->sockaddr_len) {
3914 /* Pass correct addr len to common routine (so it knows there
3915 * is only one address being passed.
3917 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3924 /* FIXME: Write comments. */
3925 static int sctp_disconnect(struct sock *sk, int flags)
3927 return -EOPNOTSUPP; /* STUB */
3930 /* 4.1.4 accept() - TCP Style Syntax
3932 * Applications use accept() call to remove an established SCTP
3933 * association from the accept queue of the endpoint. A new socket
3934 * descriptor will be returned from accept() to represent the newly
3935 * formed association.
3937 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3939 struct sctp_sock *sp;
3940 struct sctp_endpoint *ep;
3941 struct sock *newsk = NULL;
3942 struct sctp_association *asoc;
3951 if (!sctp_style(sk, TCP)) {
3952 error = -EOPNOTSUPP;
3956 if (!sctp_sstate(sk, LISTENING)) {
3961 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3963 error = sctp_wait_for_accept(sk, timeo);
3967 /* We treat the list of associations on the endpoint as the accept
3968 * queue and pick the first association on the list.
3970 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3972 newsk = sp->pf->create_accept_sk(sk, asoc);
3978 /* Populate the fields of the newsk from the oldsk and migrate the
3979 * asoc to the newsk.
3981 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3989 /* The SCTP ioctl handler. */
3990 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3997 * SEQPACKET-style sockets in LISTENING state are valid, for
3998 * SCTP, so only discard TCP-style sockets in LISTENING state.
4000 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4005 struct sk_buff *skb;
4006 unsigned int amount = 0;
4008 skb = skb_peek(&sk->sk_receive_queue);
4011 * We will only return the amount of this packet since
4012 * that is all that will be read.
4016 rc = put_user(amount, (int __user *)arg);
4028 /* This is the function which gets called during socket creation to
4029 * initialized the SCTP-specific portion of the sock.
4030 * The sock structure should already be zero-filled memory.
4032 static int sctp_init_sock(struct sock *sk)
4034 struct net *net = sock_net(sk);
4035 struct sctp_sock *sp;
4037 pr_debug("%s: sk:%p\n", __func__, sk);
4041 /* Initialize the SCTP per socket area. */
4042 switch (sk->sk_type) {
4043 case SOCK_SEQPACKET:
4044 sp->type = SCTP_SOCKET_UDP;
4047 sp->type = SCTP_SOCKET_TCP;
4050 return -ESOCKTNOSUPPORT;
4053 /* Initialize default send parameters. These parameters can be
4054 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4056 sp->default_stream = 0;
4057 sp->default_ppid = 0;
4058 sp->default_flags = 0;
4059 sp->default_context = 0;
4060 sp->default_timetolive = 0;
4062 sp->default_rcv_context = 0;
4063 sp->max_burst = net->sctp.max_burst;
4065 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4067 /* Initialize default setup parameters. These parameters
4068 * can be modified with the SCTP_INITMSG socket option or
4069 * overridden by the SCTP_INIT CMSG.
4071 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4072 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4073 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4074 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4076 /* Initialize default RTO related parameters. These parameters can
4077 * be modified for with the SCTP_RTOINFO socket option.
4079 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4080 sp->rtoinfo.srto_max = net->sctp.rto_max;
4081 sp->rtoinfo.srto_min = net->sctp.rto_min;
4083 /* Initialize default association related parameters. These parameters
4084 * can be modified with the SCTP_ASSOCINFO socket option.
4086 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4087 sp->assocparams.sasoc_number_peer_destinations = 0;
4088 sp->assocparams.sasoc_peer_rwnd = 0;
4089 sp->assocparams.sasoc_local_rwnd = 0;
4090 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4092 /* Initialize default event subscriptions. By default, all the
4095 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4097 /* Default Peer Address Parameters. These defaults can
4098 * be modified via SCTP_PEER_ADDR_PARAMS
4100 sp->hbinterval = net->sctp.hb_interval;
4101 sp->pathmaxrxt = net->sctp.max_retrans_path;
4102 sp->pathmtu = 0; /* allow default discovery */
4103 sp->sackdelay = net->sctp.sack_timeout;
4105 sp->param_flags = SPP_HB_ENABLE |
4107 SPP_SACKDELAY_ENABLE;
4109 /* If enabled no SCTP message fragmentation will be performed.
4110 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4112 sp->disable_fragments = 0;
4114 /* Enable Nagle algorithm by default. */
4117 sp->recvrcvinfo = 0;
4118 sp->recvnxtinfo = 0;
4120 /* Enable by default. */
4123 /* Auto-close idle associations after the configured
4124 * number of seconds. A value of 0 disables this
4125 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4126 * for UDP-style sockets only.
4130 /* User specified fragmentation limit. */
4133 sp->adaptation_ind = 0;
4135 sp->pf = sctp_get_pf_specific(sk->sk_family);
4137 /* Control variables for partial data delivery. */
4138 atomic_set(&sp->pd_mode, 0);
4139 skb_queue_head_init(&sp->pd_lobby);
4140 sp->frag_interleave = 0;
4142 /* Create a per socket endpoint structure. Even if we
4143 * change the data structure relationships, this may still
4144 * be useful for storing pre-connect address information.
4146 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4152 sk->sk_destruct = sctp_destruct_sock;
4154 SCTP_DBG_OBJCNT_INC(sock);
4157 sk_sockets_allocated_inc(sk);
4158 sock_prot_inuse_add(net, sk->sk_prot, 1);
4160 /* Nothing can fail after this block, otherwise
4161 * sctp_destroy_sock() will be called without addr_wq_lock held
4163 if (net->sctp.default_auto_asconf) {
4164 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4165 list_add_tail(&sp->auto_asconf_list,
4166 &net->sctp.auto_asconf_splist);
4167 sp->do_auto_asconf = 1;
4168 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4170 sp->do_auto_asconf = 0;
4178 /* Cleanup any SCTP per socket resources. Must be called with
4179 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4181 static void sctp_destroy_sock(struct sock *sk)
4183 struct sctp_sock *sp;
4185 pr_debug("%s: sk:%p\n", __func__, sk);
4187 /* Release our hold on the endpoint. */
4189 /* This could happen during socket init, thus we bail out
4190 * early, since the rest of the below is not setup either.
4195 if (sp->do_auto_asconf) {
4196 sp->do_auto_asconf = 0;
4197 list_del(&sp->auto_asconf_list);
4199 sctp_endpoint_free(sp->ep);
4201 sk_sockets_allocated_dec(sk);
4202 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4206 /* Triggered when there are no references on the socket anymore */
4207 static void sctp_destruct_sock(struct sock *sk)
4209 struct sctp_sock *sp = sctp_sk(sk);
4211 /* Free up the HMAC transform. */
4212 crypto_free_hash(sp->hmac);
4214 inet_sock_destruct(sk);
4217 /* API 4.1.7 shutdown() - TCP Style Syntax
4218 * int shutdown(int socket, int how);
4220 * sd - the socket descriptor of the association to be closed.
4221 * how - Specifies the type of shutdown. The values are
4224 * Disables further receive operations. No SCTP
4225 * protocol action is taken.
4227 * Disables further send operations, and initiates
4228 * the SCTP shutdown sequence.
4230 * Disables further send and receive operations
4231 * and initiates the SCTP shutdown sequence.
4233 static void sctp_shutdown(struct sock *sk, int how)
4235 struct net *net = sock_net(sk);
4236 struct sctp_endpoint *ep;
4237 struct sctp_association *asoc;
4239 if (!sctp_style(sk, TCP))
4242 if (how & SEND_SHUTDOWN) {
4243 ep = sctp_sk(sk)->ep;
4244 if (!list_empty(&ep->asocs)) {
4245 asoc = list_entry(ep->asocs.next,
4246 struct sctp_association, asocs);
4247 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4252 /* 7.2.1 Association Status (SCTP_STATUS)
4254 * Applications can retrieve current status information about an
4255 * association, including association state, peer receiver window size,
4256 * number of unacked data chunks, and number of data chunks pending
4257 * receipt. This information is read-only.
4259 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4260 char __user *optval,
4263 struct sctp_status status;
4264 struct sctp_association *asoc = NULL;
4265 struct sctp_transport *transport;
4266 sctp_assoc_t associd;
4269 if (len < sizeof(status)) {
4274 len = sizeof(status);
4275 if (copy_from_user(&status, optval, len)) {
4280 associd = status.sstat_assoc_id;
4281 asoc = sctp_id2assoc(sk, associd);
4287 transport = asoc->peer.primary_path;
4289 status.sstat_assoc_id = sctp_assoc2id(asoc);
4290 status.sstat_state = sctp_assoc_to_state(asoc);
4291 status.sstat_rwnd = asoc->peer.rwnd;
4292 status.sstat_unackdata = asoc->unack_data;
4294 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4295 status.sstat_instrms = asoc->c.sinit_max_instreams;
4296 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4297 status.sstat_fragmentation_point = asoc->frag_point;
4298 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4299 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4300 transport->af_specific->sockaddr_len);
4301 /* Map ipv4 address into v4-mapped-on-v6 address. */
4302 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4303 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4304 status.sstat_primary.spinfo_state = transport->state;
4305 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4306 status.sstat_primary.spinfo_srtt = transport->srtt;
4307 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4308 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4310 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4311 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4313 if (put_user(len, optlen)) {
4318 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4319 __func__, len, status.sstat_state, status.sstat_rwnd,
4320 status.sstat_assoc_id);
4322 if (copy_to_user(optval, &status, len)) {
4332 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4334 * Applications can retrieve information about a specific peer address
4335 * of an association, including its reachability state, congestion
4336 * window, and retransmission timer values. This information is
4339 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4340 char __user *optval,
4343 struct sctp_paddrinfo pinfo;
4344 struct sctp_transport *transport;
4347 if (len < sizeof(pinfo)) {
4352 len = sizeof(pinfo);
4353 if (copy_from_user(&pinfo, optval, len)) {
4358 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4359 pinfo.spinfo_assoc_id);
4363 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4364 pinfo.spinfo_state = transport->state;
4365 pinfo.spinfo_cwnd = transport->cwnd;
4366 pinfo.spinfo_srtt = transport->srtt;
4367 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4368 pinfo.spinfo_mtu = transport->pathmtu;
4370 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4371 pinfo.spinfo_state = SCTP_ACTIVE;
4373 if (put_user(len, optlen)) {
4378 if (copy_to_user(optval, &pinfo, len)) {
4387 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4389 * This option is a on/off flag. If enabled no SCTP message
4390 * fragmentation will be performed. Instead if a message being sent
4391 * exceeds the current PMTU size, the message will NOT be sent and
4392 * instead a error will be indicated to the user.
4394 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4395 char __user *optval, int __user *optlen)
4399 if (len < sizeof(int))
4403 val = (sctp_sk(sk)->disable_fragments == 1);
4404 if (put_user(len, optlen))
4406 if (copy_to_user(optval, &val, len))
4411 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4413 * This socket option is used to specify various notifications and
4414 * ancillary data the user wishes to receive.
4416 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4421 if (len > sizeof(struct sctp_event_subscribe))
4422 len = sizeof(struct sctp_event_subscribe);
4423 if (put_user(len, optlen))
4425 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4430 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4432 * This socket option is applicable to the UDP-style socket only. When
4433 * set it will cause associations that are idle for more than the
4434 * specified number of seconds to automatically close. An association
4435 * being idle is defined an association that has NOT sent or received
4436 * user data. The special value of '0' indicates that no automatic
4437 * close of any associations should be performed. The option expects an
4438 * integer defining the number of seconds of idle time before an
4439 * association is closed.
4441 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4443 /* Applicable to UDP-style socket only */
4444 if (sctp_style(sk, TCP))
4446 if (len < sizeof(int))
4449 if (put_user(len, optlen))
4451 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
4456 /* Helper routine to branch off an association to a new socket. */
4457 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4459 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4460 struct sctp_sock *sp = sctp_sk(sk);
4461 struct socket *sock;
4464 /* Do not peel off from one netns to another one. */
4465 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
4471 /* An association cannot be branched off from an already peeled-off
4472 * socket, nor is this supported for tcp style sockets.
4474 if (!sctp_style(sk, UDP))
4477 /* Create a new socket. */
4478 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4482 sctp_copy_sock(sock->sk, sk, asoc);
4484 /* Make peeled-off sockets more like 1-1 accepted sockets.
4485 * Set the daddr and initialize id to something more random
4487 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4489 /* Populate the fields of the newsk from the oldsk and migrate the
4490 * asoc to the newsk.
4492 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4498 EXPORT_SYMBOL(sctp_do_peeloff);
4500 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4502 sctp_peeloff_arg_t peeloff;
4503 struct socket *newsock;
4504 struct file *newfile;
4507 if (len < sizeof(sctp_peeloff_arg_t))
4509 len = sizeof(sctp_peeloff_arg_t);
4510 if (copy_from_user(&peeloff, optval, len))
4513 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4517 /* Map the socket to an unused fd that can be returned to the user. */
4518 retval = get_unused_fd_flags(0);
4520 sock_release(newsock);
4524 newfile = sock_alloc_file(newsock, 0, NULL);
4525 if (IS_ERR(newfile)) {
4526 put_unused_fd(retval);
4527 sock_release(newsock);
4528 return PTR_ERR(newfile);
4531 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4534 /* Return the fd mapped to the new socket. */
4535 if (put_user(len, optlen)) {
4537 put_unused_fd(retval);
4540 peeloff.sd = retval;
4541 if (copy_to_user(optval, &peeloff, len)) {
4543 put_unused_fd(retval);
4546 fd_install(retval, newfile);
4551 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4553 * Applications can enable or disable heartbeats for any peer address of
4554 * an association, modify an address's heartbeat interval, force a
4555 * heartbeat to be sent immediately, and adjust the address's maximum
4556 * number of retransmissions sent before an address is considered
4557 * unreachable. The following structure is used to access and modify an
4558 * address's parameters:
4560 * struct sctp_paddrparams {
4561 * sctp_assoc_t spp_assoc_id;
4562 * struct sockaddr_storage spp_address;
4563 * uint32_t spp_hbinterval;
4564 * uint16_t spp_pathmaxrxt;
4565 * uint32_t spp_pathmtu;
4566 * uint32_t spp_sackdelay;
4567 * uint32_t spp_flags;
4570 * spp_assoc_id - (one-to-many style socket) This is filled in the
4571 * application, and identifies the association for
4573 * spp_address - This specifies which address is of interest.
4574 * spp_hbinterval - This contains the value of the heartbeat interval,
4575 * in milliseconds. If a value of zero
4576 * is present in this field then no changes are to
4577 * be made to this parameter.
4578 * spp_pathmaxrxt - This contains the maximum number of
4579 * retransmissions before this address shall be
4580 * considered unreachable. If a value of zero
4581 * is present in this field then no changes are to
4582 * be made to this parameter.
4583 * spp_pathmtu - When Path MTU discovery is disabled the value
4584 * specified here will be the "fixed" path mtu.
4585 * Note that if the spp_address field is empty
4586 * then all associations on this address will
4587 * have this fixed path mtu set upon them.
4589 * spp_sackdelay - When delayed sack is enabled, this value specifies
4590 * the number of milliseconds that sacks will be delayed
4591 * for. This value will apply to all addresses of an
4592 * association if the spp_address field is empty. Note
4593 * also, that if delayed sack is enabled and this
4594 * value is set to 0, no change is made to the last
4595 * recorded delayed sack timer value.
4597 * spp_flags - These flags are used to control various features
4598 * on an association. The flag field may contain
4599 * zero or more of the following options.
4601 * SPP_HB_ENABLE - Enable heartbeats on the
4602 * specified address. Note that if the address
4603 * field is empty all addresses for the association
4604 * have heartbeats enabled upon them.
4606 * SPP_HB_DISABLE - Disable heartbeats on the
4607 * speicifed address. Note that if the address
4608 * field is empty all addresses for the association
4609 * will have their heartbeats disabled. Note also
4610 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4611 * mutually exclusive, only one of these two should
4612 * be specified. Enabling both fields will have
4613 * undetermined results.
4615 * SPP_HB_DEMAND - Request a user initiated heartbeat
4616 * to be made immediately.
4618 * SPP_PMTUD_ENABLE - This field will enable PMTU
4619 * discovery upon the specified address. Note that
4620 * if the address feild is empty then all addresses
4621 * on the association are effected.
4623 * SPP_PMTUD_DISABLE - This field will disable PMTU
4624 * discovery upon the specified address. Note that
4625 * if the address feild is empty then all addresses
4626 * on the association are effected. Not also that
4627 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4628 * exclusive. Enabling both will have undetermined
4631 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4632 * on delayed sack. The time specified in spp_sackdelay
4633 * is used to specify the sack delay for this address. Note
4634 * that if spp_address is empty then all addresses will
4635 * enable delayed sack and take on the sack delay
4636 * value specified in spp_sackdelay.
4637 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4638 * off delayed sack. If the spp_address field is blank then
4639 * delayed sack is disabled for the entire association. Note
4640 * also that this field is mutually exclusive to
4641 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4644 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4645 char __user *optval, int __user *optlen)
4647 struct sctp_paddrparams params;
4648 struct sctp_transport *trans = NULL;
4649 struct sctp_association *asoc = NULL;
4650 struct sctp_sock *sp = sctp_sk(sk);
4652 if (len < sizeof(struct sctp_paddrparams))
4654 len = sizeof(struct sctp_paddrparams);
4655 if (copy_from_user(¶ms, optval, len))
4658 /* If an address other than INADDR_ANY is specified, and
4659 * no transport is found, then the request is invalid.
4661 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
4662 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4663 params.spp_assoc_id);
4665 pr_debug("%s: failed no transport\n", __func__);
4670 /* Get association, if assoc_id != 0 and the socket is a one
4671 * to many style socket, and an association was not found, then
4672 * the id was invalid.
4674 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4675 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4676 pr_debug("%s: failed no association\n", __func__);
4681 /* Fetch transport values. */
4682 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4683 params.spp_pathmtu = trans->pathmtu;
4684 params.spp_pathmaxrxt = trans->pathmaxrxt;
4685 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4687 /*draft-11 doesn't say what to return in spp_flags*/
4688 params.spp_flags = trans->param_flags;
4690 /* Fetch association values. */
4691 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4692 params.spp_pathmtu = asoc->pathmtu;
4693 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4694 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4696 /*draft-11 doesn't say what to return in spp_flags*/
4697 params.spp_flags = asoc->param_flags;
4699 /* Fetch socket values. */
4700 params.spp_hbinterval = sp->hbinterval;
4701 params.spp_pathmtu = sp->pathmtu;
4702 params.spp_sackdelay = sp->sackdelay;
4703 params.spp_pathmaxrxt = sp->pathmaxrxt;
4705 /*draft-11 doesn't say what to return in spp_flags*/
4706 params.spp_flags = sp->param_flags;
4709 if (copy_to_user(optval, ¶ms, len))
4712 if (put_user(len, optlen))
4719 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4721 * This option will effect the way delayed acks are performed. This
4722 * option allows you to get or set the delayed ack time, in
4723 * milliseconds. It also allows changing the delayed ack frequency.
4724 * Changing the frequency to 1 disables the delayed sack algorithm. If
4725 * the assoc_id is 0, then this sets or gets the endpoints default
4726 * values. If the assoc_id field is non-zero, then the set or get
4727 * effects the specified association for the one to many model (the
4728 * assoc_id field is ignored by the one to one model). Note that if
4729 * sack_delay or sack_freq are 0 when setting this option, then the
4730 * current values will remain unchanged.
4732 * struct sctp_sack_info {
4733 * sctp_assoc_t sack_assoc_id;
4734 * uint32_t sack_delay;
4735 * uint32_t sack_freq;
4738 * sack_assoc_id - This parameter, indicates which association the user
4739 * is performing an action upon. Note that if this field's value is
4740 * zero then the endpoints default value is changed (effecting future
4741 * associations only).
4743 * sack_delay - This parameter contains the number of milliseconds that
4744 * the user is requesting the delayed ACK timer be set to. Note that
4745 * this value is defined in the standard to be between 200 and 500
4748 * sack_freq - This parameter contains the number of packets that must
4749 * be received before a sack is sent without waiting for the delay
4750 * timer to expire. The default value for this is 2, setting this
4751 * value to 1 will disable the delayed sack algorithm.
4753 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4754 char __user *optval,
4757 struct sctp_sack_info params;
4758 struct sctp_association *asoc = NULL;
4759 struct sctp_sock *sp = sctp_sk(sk);
4761 if (len >= sizeof(struct sctp_sack_info)) {
4762 len = sizeof(struct sctp_sack_info);
4764 if (copy_from_user(¶ms, optval, len))
4766 } else if (len == sizeof(struct sctp_assoc_value)) {
4767 pr_warn_ratelimited(DEPRECATED
4769 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4770 "Use struct sctp_sack_info instead\n",
4771 current->comm, task_pid_nr(current));
4772 if (copy_from_user(¶ms, optval, len))
4777 /* Get association, if sack_assoc_id != 0 and the socket is a one
4778 * to many style socket, and an association was not found, then
4779 * the id was invalid.
4781 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4782 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4786 /* Fetch association values. */
4787 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4788 params.sack_delay = jiffies_to_msecs(
4790 params.sack_freq = asoc->sackfreq;
4793 params.sack_delay = 0;
4794 params.sack_freq = 1;
4797 /* Fetch socket values. */
4798 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4799 params.sack_delay = sp->sackdelay;
4800 params.sack_freq = sp->sackfreq;
4802 params.sack_delay = 0;
4803 params.sack_freq = 1;
4807 if (copy_to_user(optval, ¶ms, len))
4810 if (put_user(len, optlen))
4816 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4818 * Applications can specify protocol parameters for the default association
4819 * initialization. The option name argument to setsockopt() and getsockopt()
4822 * Setting initialization parameters is effective only on an unconnected
4823 * socket (for UDP-style sockets only future associations are effected
4824 * by the change). With TCP-style sockets, this option is inherited by
4825 * sockets derived from a listener socket.
4827 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4829 if (len < sizeof(struct sctp_initmsg))
4831 len = sizeof(struct sctp_initmsg);
4832 if (put_user(len, optlen))
4834 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4840 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4841 char __user *optval, int __user *optlen)
4843 struct sctp_association *asoc;
4845 struct sctp_getaddrs getaddrs;
4846 struct sctp_transport *from;
4848 union sctp_addr temp;
4849 struct sctp_sock *sp = sctp_sk(sk);
4854 if (len < sizeof(struct sctp_getaddrs))
4857 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4860 /* For UDP-style sockets, id specifies the association to query. */
4861 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4865 to = optval + offsetof(struct sctp_getaddrs, addrs);
4866 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4868 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4870 memcpy(&temp, &from->ipaddr, sizeof(temp));
4871 addrlen = sctp_get_pf_specific(sk->sk_family)
4872 ->addr_to_user(sp, &temp);
4873 if (space_left < addrlen)
4875 if (copy_to_user(to, &temp, addrlen))
4879 space_left -= addrlen;
4882 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4884 bytes_copied = ((char __user *)to) - optval;
4885 if (put_user(bytes_copied, optlen))
4891 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4892 size_t space_left, int *bytes_copied)
4894 struct sctp_sockaddr_entry *addr;
4895 union sctp_addr temp;
4898 struct net *net = sock_net(sk);
4901 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4905 if ((PF_INET == sk->sk_family) &&
4906 (AF_INET6 == addr->a.sa.sa_family))
4908 if ((PF_INET6 == sk->sk_family) &&
4909 inet_v6_ipv6only(sk) &&
4910 (AF_INET == addr->a.sa.sa_family))
4912 memcpy(&temp, &addr->a, sizeof(temp));
4913 if (!temp.v4.sin_port)
4914 temp.v4.sin_port = htons(port);
4916 addrlen = sctp_get_pf_specific(sk->sk_family)
4917 ->addr_to_user(sctp_sk(sk), &temp);
4919 if (space_left < addrlen) {
4923 memcpy(to, &temp, addrlen);
4927 space_left -= addrlen;
4928 *bytes_copied += addrlen;
4936 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4937 char __user *optval, int __user *optlen)
4939 struct sctp_bind_addr *bp;
4940 struct sctp_association *asoc;
4942 struct sctp_getaddrs getaddrs;
4943 struct sctp_sockaddr_entry *addr;
4945 union sctp_addr temp;
4946 struct sctp_sock *sp = sctp_sk(sk);
4950 int bytes_copied = 0;
4954 if (len < sizeof(struct sctp_getaddrs))
4957 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4961 * For UDP-style sockets, id specifies the association to query.
4962 * If the id field is set to the value '0' then the locally bound
4963 * addresses are returned without regard to any particular
4966 if (0 == getaddrs.assoc_id) {
4967 bp = &sctp_sk(sk)->ep->base.bind_addr;
4969 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4972 bp = &asoc->base.bind_addr;
4975 to = optval + offsetof(struct sctp_getaddrs, addrs);
4976 space_left = len - offsetof(struct sctp_getaddrs, addrs);
4978 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
4982 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4983 * addresses from the global local address list.
4985 if (sctp_list_single_entry(&bp->address_list)) {
4986 addr = list_entry(bp->address_list.next,
4987 struct sctp_sockaddr_entry, list);
4988 if (sctp_is_any(sk, &addr->a)) {
4989 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4990 space_left, &bytes_copied);
5000 /* Protection on the bound address list is not needed since
5001 * in the socket option context we hold a socket lock and
5002 * thus the bound address list can't change.
5004 list_for_each_entry(addr, &bp->address_list, list) {
5005 memcpy(&temp, &addr->a, sizeof(temp));
5006 addrlen = sctp_get_pf_specific(sk->sk_family)
5007 ->addr_to_user(sp, &temp);
5008 if (space_left < addrlen) {
5009 err = -ENOMEM; /*fixme: right error?*/
5012 memcpy(buf, &temp, addrlen);
5014 bytes_copied += addrlen;
5016 space_left -= addrlen;
5020 if (copy_to_user(to, addrs, bytes_copied)) {
5024 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5028 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5029 * but we can't change it anymore.
5031 if (put_user(bytes_copied, optlen))
5038 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5040 * Requests that the local SCTP stack use the enclosed peer address as
5041 * the association primary. The enclosed address must be one of the
5042 * association peer's addresses.
5044 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5045 char __user *optval, int __user *optlen)
5047 struct sctp_prim prim;
5048 struct sctp_association *asoc;
5049 struct sctp_sock *sp = sctp_sk(sk);
5051 if (len < sizeof(struct sctp_prim))
5054 len = sizeof(struct sctp_prim);
5056 if (copy_from_user(&prim, optval, len))
5059 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5063 if (!asoc->peer.primary_path)
5066 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5067 asoc->peer.primary_path->af_specific->sockaddr_len);
5069 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5070 (union sctp_addr *)&prim.ssp_addr);
5072 if (put_user(len, optlen))
5074 if (copy_to_user(optval, &prim, len))
5081 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5083 * Requests that the local endpoint set the specified Adaptation Layer
5084 * Indication parameter for all future INIT and INIT-ACK exchanges.
5086 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5087 char __user *optval, int __user *optlen)
5089 struct sctp_setadaptation adaptation;
5091 if (len < sizeof(struct sctp_setadaptation))
5094 len = sizeof(struct sctp_setadaptation);
5096 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5098 if (put_user(len, optlen))
5100 if (copy_to_user(optval, &adaptation, len))
5108 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5110 * Applications that wish to use the sendto() system call may wish to
5111 * specify a default set of parameters that would normally be supplied
5112 * through the inclusion of ancillary data. This socket option allows
5113 * such an application to set the default sctp_sndrcvinfo structure.
5116 * The application that wishes to use this socket option simply passes
5117 * in to this call the sctp_sndrcvinfo structure defined in Section
5118 * 5.2.2) The input parameters accepted by this call include
5119 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5120 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5121 * to this call if the caller is using the UDP model.
5123 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5125 static int sctp_getsockopt_default_send_param(struct sock *sk,
5126 int len, char __user *optval,
5129 struct sctp_sock *sp = sctp_sk(sk);
5130 struct sctp_association *asoc;
5131 struct sctp_sndrcvinfo info;
5133 if (len < sizeof(info))
5138 if (copy_from_user(&info, optval, len))
5141 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5142 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5145 info.sinfo_stream = asoc->default_stream;
5146 info.sinfo_flags = asoc->default_flags;
5147 info.sinfo_ppid = asoc->default_ppid;
5148 info.sinfo_context = asoc->default_context;
5149 info.sinfo_timetolive = asoc->default_timetolive;
5151 info.sinfo_stream = sp->default_stream;
5152 info.sinfo_flags = sp->default_flags;
5153 info.sinfo_ppid = sp->default_ppid;
5154 info.sinfo_context = sp->default_context;
5155 info.sinfo_timetolive = sp->default_timetolive;
5158 if (put_user(len, optlen))
5160 if (copy_to_user(optval, &info, len))
5166 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5167 * (SCTP_DEFAULT_SNDINFO)
5169 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5170 char __user *optval,
5173 struct sctp_sock *sp = sctp_sk(sk);
5174 struct sctp_association *asoc;
5175 struct sctp_sndinfo info;
5177 if (len < sizeof(info))
5182 if (copy_from_user(&info, optval, len))
5185 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5186 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5189 info.snd_sid = asoc->default_stream;
5190 info.snd_flags = asoc->default_flags;
5191 info.snd_ppid = asoc->default_ppid;
5192 info.snd_context = asoc->default_context;
5194 info.snd_sid = sp->default_stream;
5195 info.snd_flags = sp->default_flags;
5196 info.snd_ppid = sp->default_ppid;
5197 info.snd_context = sp->default_context;
5200 if (put_user(len, optlen))
5202 if (copy_to_user(optval, &info, len))
5210 * 7.1.5 SCTP_NODELAY
5212 * Turn on/off any Nagle-like algorithm. This means that packets are
5213 * generally sent as soon as possible and no unnecessary delays are
5214 * introduced, at the cost of more packets in the network. Expects an
5215 * integer boolean flag.
5218 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5219 char __user *optval, int __user *optlen)
5223 if (len < sizeof(int))
5227 val = (sctp_sk(sk)->nodelay == 1);
5228 if (put_user(len, optlen))
5230 if (copy_to_user(optval, &val, len))
5237 * 7.1.1 SCTP_RTOINFO
5239 * The protocol parameters used to initialize and bound retransmission
5240 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5241 * and modify these parameters.
5242 * All parameters are time values, in milliseconds. A value of 0, when
5243 * modifying the parameters, indicates that the current value should not
5247 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5248 char __user *optval,
5249 int __user *optlen) {
5250 struct sctp_rtoinfo rtoinfo;
5251 struct sctp_association *asoc;
5253 if (len < sizeof (struct sctp_rtoinfo))
5256 len = sizeof(struct sctp_rtoinfo);
5258 if (copy_from_user(&rtoinfo, optval, len))
5261 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5263 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5266 /* Values corresponding to the specific association. */
5268 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5269 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5270 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5272 /* Values corresponding to the endpoint. */
5273 struct sctp_sock *sp = sctp_sk(sk);
5275 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5276 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5277 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5280 if (put_user(len, optlen))
5283 if (copy_to_user(optval, &rtoinfo, len))
5291 * 7.1.2 SCTP_ASSOCINFO
5293 * This option is used to tune the maximum retransmission attempts
5294 * of the association.
5295 * Returns an error if the new association retransmission value is
5296 * greater than the sum of the retransmission value of the peer.
5297 * See [SCTP] for more information.
5300 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5301 char __user *optval,
5305 struct sctp_assocparams assocparams;
5306 struct sctp_association *asoc;
5307 struct list_head *pos;
5310 if (len < sizeof (struct sctp_assocparams))
5313 len = sizeof(struct sctp_assocparams);
5315 if (copy_from_user(&assocparams, optval, len))
5318 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5320 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5323 /* Values correspoinding to the specific association */
5325 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5326 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5327 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5328 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5330 list_for_each(pos, &asoc->peer.transport_addr_list) {
5334 assocparams.sasoc_number_peer_destinations = cnt;
5336 /* Values corresponding to the endpoint */
5337 struct sctp_sock *sp = sctp_sk(sk);
5339 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5340 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5341 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5342 assocparams.sasoc_cookie_life =
5343 sp->assocparams.sasoc_cookie_life;
5344 assocparams.sasoc_number_peer_destinations =
5346 sasoc_number_peer_destinations;
5349 if (put_user(len, optlen))
5352 if (copy_to_user(optval, &assocparams, len))
5359 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5361 * This socket option is a boolean flag which turns on or off mapped V4
5362 * addresses. If this option is turned on and the socket is type
5363 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5364 * If this option is turned off, then no mapping will be done of V4
5365 * addresses and a user will receive both PF_INET6 and PF_INET type
5366 * addresses on the socket.
5368 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5369 char __user *optval, int __user *optlen)
5372 struct sctp_sock *sp = sctp_sk(sk);
5374 if (len < sizeof(int))
5379 if (put_user(len, optlen))
5381 if (copy_to_user(optval, &val, len))
5388 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5389 * (chapter and verse is quoted at sctp_setsockopt_context())
5391 static int sctp_getsockopt_context(struct sock *sk, int len,
5392 char __user *optval, int __user *optlen)
5394 struct sctp_assoc_value params;
5395 struct sctp_sock *sp;
5396 struct sctp_association *asoc;
5398 if (len < sizeof(struct sctp_assoc_value))
5401 len = sizeof(struct sctp_assoc_value);
5403 if (copy_from_user(¶ms, optval, len))
5408 if (params.assoc_id != 0) {
5409 asoc = sctp_id2assoc(sk, params.assoc_id);
5412 params.assoc_value = asoc->default_rcv_context;
5414 params.assoc_value = sp->default_rcv_context;
5417 if (put_user(len, optlen))
5419 if (copy_to_user(optval, ¶ms, len))
5426 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5427 * This option will get or set the maximum size to put in any outgoing
5428 * SCTP DATA chunk. If a message is larger than this size it will be
5429 * fragmented by SCTP into the specified size. Note that the underlying
5430 * SCTP implementation may fragment into smaller sized chunks when the
5431 * PMTU of the underlying association is smaller than the value set by
5432 * the user. The default value for this option is '0' which indicates
5433 * the user is NOT limiting fragmentation and only the PMTU will effect
5434 * SCTP's choice of DATA chunk size. Note also that values set larger
5435 * than the maximum size of an IP datagram will effectively let SCTP
5436 * control fragmentation (i.e. the same as setting this option to 0).
5438 * The following structure is used to access and modify this parameter:
5440 * struct sctp_assoc_value {
5441 * sctp_assoc_t assoc_id;
5442 * uint32_t assoc_value;
5445 * assoc_id: This parameter is ignored for one-to-one style sockets.
5446 * For one-to-many style sockets this parameter indicates which
5447 * association the user is performing an action upon. Note that if
5448 * this field's value is zero then the endpoints default value is
5449 * changed (effecting future associations only).
5450 * assoc_value: This parameter specifies the maximum size in bytes.
5452 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5453 char __user *optval, int __user *optlen)
5455 struct sctp_assoc_value params;
5456 struct sctp_association *asoc;
5458 if (len == sizeof(int)) {
5459 pr_warn_ratelimited(DEPRECATED
5461 "Use of int in maxseg socket option.\n"
5462 "Use struct sctp_assoc_value instead\n",
5463 current->comm, task_pid_nr(current));
5464 params.assoc_id = 0;
5465 } else if (len >= sizeof(struct sctp_assoc_value)) {
5466 len = sizeof(struct sctp_assoc_value);
5467 if (copy_from_user(¶ms, optval, len))
5472 asoc = sctp_id2assoc(sk, params.assoc_id);
5473 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5477 params.assoc_value = asoc->frag_point;
5479 params.assoc_value = sctp_sk(sk)->user_frag;
5481 if (put_user(len, optlen))
5483 if (len == sizeof(int)) {
5484 if (copy_to_user(optval, ¶ms.assoc_value, len))
5487 if (copy_to_user(optval, ¶ms, len))
5495 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5496 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5498 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5499 char __user *optval, int __user *optlen)
5503 if (len < sizeof(int))
5508 val = sctp_sk(sk)->frag_interleave;
5509 if (put_user(len, optlen))
5511 if (copy_to_user(optval, &val, len))
5518 * 7.1.25. Set or Get the sctp partial delivery point
5519 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5521 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5522 char __user *optval,
5527 if (len < sizeof(u32))
5532 val = sctp_sk(sk)->pd_point;
5533 if (put_user(len, optlen))
5535 if (copy_to_user(optval, &val, len))
5542 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5543 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5545 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5546 char __user *optval,
5549 struct sctp_assoc_value params;
5550 struct sctp_sock *sp;
5551 struct sctp_association *asoc;
5553 if (len == sizeof(int)) {
5554 pr_warn_ratelimited(DEPRECATED
5556 "Use of int in max_burst socket option.\n"
5557 "Use struct sctp_assoc_value instead\n",
5558 current->comm, task_pid_nr(current));
5559 params.assoc_id = 0;
5560 } else if (len >= sizeof(struct sctp_assoc_value)) {
5561 len = sizeof(struct sctp_assoc_value);
5562 if (copy_from_user(¶ms, optval, len))
5569 if (params.assoc_id != 0) {
5570 asoc = sctp_id2assoc(sk, params.assoc_id);
5573 params.assoc_value = asoc->max_burst;
5575 params.assoc_value = sp->max_burst;
5577 if (len == sizeof(int)) {
5578 if (copy_to_user(optval, ¶ms.assoc_value, len))
5581 if (copy_to_user(optval, ¶ms, len))
5589 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5590 char __user *optval, int __user *optlen)
5592 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5593 struct sctp_hmacalgo __user *p = (void __user *)optval;
5594 struct sctp_hmac_algo_param *hmacs;
5599 if (!ep->auth_enable)
5602 hmacs = ep->auth_hmacs_list;
5603 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5605 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5608 len = sizeof(struct sctp_hmacalgo) + data_len;
5609 num_idents = data_len / sizeof(u16);
5611 if (put_user(len, optlen))
5613 if (put_user(num_idents, &p->shmac_num_idents))
5615 for (i = 0; i < num_idents; i++) {
5616 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
5618 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
5624 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5625 char __user *optval, int __user *optlen)
5627 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5628 struct sctp_authkeyid val;
5629 struct sctp_association *asoc;
5631 if (!ep->auth_enable)
5634 if (len < sizeof(struct sctp_authkeyid))
5637 len = sizeof(struct sctp_authkeyid);
5638 if (copy_from_user(&val, optval, len))
5641 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5642 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5646 val.scact_keynumber = asoc->active_key_id;
5648 val.scact_keynumber = ep->active_key_id;
5650 if (put_user(len, optlen))
5652 if (copy_to_user(optval, &val, len))
5658 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5659 char __user *optval, int __user *optlen)
5661 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5662 struct sctp_authchunks __user *p = (void __user *)optval;
5663 struct sctp_authchunks val;
5664 struct sctp_association *asoc;
5665 struct sctp_chunks_param *ch;
5669 if (!ep->auth_enable)
5672 if (len < sizeof(struct sctp_authchunks))
5675 if (copy_from_user(&val, optval, sizeof(val)))
5678 to = p->gauth_chunks;
5679 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5683 ch = asoc->peer.peer_chunks;
5687 /* See if the user provided enough room for all the data */
5688 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5689 if (len < num_chunks)
5692 if (copy_to_user(to, ch->chunks, num_chunks))
5695 len = sizeof(struct sctp_authchunks) + num_chunks;
5696 if (put_user(len, optlen))
5698 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5703 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5704 char __user *optval, int __user *optlen)
5706 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5707 struct sctp_authchunks __user *p = (void __user *)optval;
5708 struct sctp_authchunks val;
5709 struct sctp_association *asoc;
5710 struct sctp_chunks_param *ch;
5714 if (!ep->auth_enable)
5717 if (len < sizeof(struct sctp_authchunks))
5720 if (copy_from_user(&val, optval, sizeof(val)))
5723 to = p->gauth_chunks;
5724 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5725 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5729 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5731 ch = ep->auth_chunk_list;
5736 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5737 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5740 if (copy_to_user(to, ch->chunks, num_chunks))
5743 len = sizeof(struct sctp_authchunks) + num_chunks;
5744 if (put_user(len, optlen))
5746 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5753 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5754 * This option gets the current number of associations that are attached
5755 * to a one-to-many style socket. The option value is an uint32_t.
5757 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5758 char __user *optval, int __user *optlen)
5760 struct sctp_sock *sp = sctp_sk(sk);
5761 struct sctp_association *asoc;
5764 if (sctp_style(sk, TCP))
5767 if (len < sizeof(u32))
5772 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5776 if (put_user(len, optlen))
5778 if (copy_to_user(optval, &val, len))
5785 * 8.1.23 SCTP_AUTO_ASCONF
5786 * See the corresponding setsockopt entry as description
5788 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5789 char __user *optval, int __user *optlen)
5793 if (len < sizeof(int))
5797 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5799 if (put_user(len, optlen))
5801 if (copy_to_user(optval, &val, len))
5807 * 8.2.6. Get the Current Identifiers of Associations
5808 * (SCTP_GET_ASSOC_ID_LIST)
5810 * This option gets the current list of SCTP association identifiers of
5811 * the SCTP associations handled by a one-to-many style socket.
5813 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5814 char __user *optval, int __user *optlen)
5816 struct sctp_sock *sp = sctp_sk(sk);
5817 struct sctp_association *asoc;
5818 struct sctp_assoc_ids *ids;
5821 if (sctp_style(sk, TCP))
5824 if (len < sizeof(struct sctp_assoc_ids))
5827 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5831 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5834 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5836 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
5840 ids->gaids_number_of_ids = num;
5842 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5843 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5846 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5856 * SCTP_PEER_ADDR_THLDS
5858 * This option allows us to fetch the partially failed threshold for one or all
5859 * transports in an association. See Section 6.1 of:
5860 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5862 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5863 char __user *optval,
5867 struct sctp_paddrthlds val;
5868 struct sctp_transport *trans;
5869 struct sctp_association *asoc;
5871 if (len < sizeof(struct sctp_paddrthlds))
5873 len = sizeof(struct sctp_paddrthlds);
5874 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5877 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5878 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5882 val.spt_pathpfthld = asoc->pf_retrans;
5883 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5885 trans = sctp_addr_id2transport(sk, &val.spt_address,
5890 val.spt_pathmaxrxt = trans->pathmaxrxt;
5891 val.spt_pathpfthld = trans->pf_retrans;
5894 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5901 * SCTP_GET_ASSOC_STATS
5903 * This option retrieves local per endpoint statistics. It is modeled
5904 * after OpenSolaris' implementation
5906 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5907 char __user *optval,
5910 struct sctp_assoc_stats sas;
5911 struct sctp_association *asoc = NULL;
5913 /* User must provide at least the assoc id */
5914 if (len < sizeof(sctp_assoc_t))
5917 /* Allow the struct to grow and fill in as much as possible */
5918 len = min_t(size_t, len, sizeof(sas));
5920 if (copy_from_user(&sas, optval, len))
5923 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5927 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5928 sas.sas_gapcnt = asoc->stats.gapcnt;
5929 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5930 sas.sas_osacks = asoc->stats.osacks;
5931 sas.sas_isacks = asoc->stats.isacks;
5932 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5933 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5934 sas.sas_oodchunks = asoc->stats.oodchunks;
5935 sas.sas_iodchunks = asoc->stats.iodchunks;
5936 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5937 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5938 sas.sas_idupchunks = asoc->stats.idupchunks;
5939 sas.sas_opackets = asoc->stats.opackets;
5940 sas.sas_ipackets = asoc->stats.ipackets;
5942 /* New high max rto observed, will return 0 if not a single
5943 * RTO update took place. obs_rto_ipaddr will be bogus
5946 sas.sas_maxrto = asoc->stats.max_obs_rto;
5947 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5948 sizeof(struct sockaddr_storage));
5950 /* Mark beginning of a new observation period */
5951 asoc->stats.max_obs_rto = asoc->rto_min;
5953 if (put_user(len, optlen))
5956 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5958 if (copy_to_user(optval, &sas, len))
5964 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5965 char __user *optval,
5970 if (len < sizeof(int))
5974 if (sctp_sk(sk)->recvrcvinfo)
5976 if (put_user(len, optlen))
5978 if (copy_to_user(optval, &val, len))
5984 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5985 char __user *optval,
5990 if (len < sizeof(int))
5994 if (sctp_sk(sk)->recvnxtinfo)
5996 if (put_user(len, optlen))
5998 if (copy_to_user(optval, &val, len))
6004 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6005 char __user *optval, int __user *optlen)
6010 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6012 /* I can hardly begin to describe how wrong this is. This is
6013 * so broken as to be worse than useless. The API draft
6014 * REALLY is NOT helpful here... I am not convinced that the
6015 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6016 * are at all well-founded.
6018 if (level != SOL_SCTP) {
6019 struct sctp_af *af = sctp_sk(sk)->pf->af;
6021 retval = af->getsockopt(sk, level, optname, optval, optlen);
6025 if (get_user(len, optlen))
6035 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6037 case SCTP_DISABLE_FRAGMENTS:
6038 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6042 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6044 case SCTP_AUTOCLOSE:
6045 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6047 case SCTP_SOCKOPT_PEELOFF:
6048 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6050 case SCTP_PEER_ADDR_PARAMS:
6051 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6054 case SCTP_DELAYED_SACK:
6055 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6059 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6061 case SCTP_GET_PEER_ADDRS:
6062 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6065 case SCTP_GET_LOCAL_ADDRS:
6066 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6069 case SCTP_SOCKOPT_CONNECTX3:
6070 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6072 case SCTP_DEFAULT_SEND_PARAM:
6073 retval = sctp_getsockopt_default_send_param(sk, len,
6076 case SCTP_DEFAULT_SNDINFO:
6077 retval = sctp_getsockopt_default_sndinfo(sk, len,
6080 case SCTP_PRIMARY_ADDR:
6081 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6084 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6087 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6089 case SCTP_ASSOCINFO:
6090 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6092 case SCTP_I_WANT_MAPPED_V4_ADDR:
6093 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6096 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6098 case SCTP_GET_PEER_ADDR_INFO:
6099 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6102 case SCTP_ADAPTATION_LAYER:
6103 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6107 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6109 case SCTP_FRAGMENT_INTERLEAVE:
6110 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6113 case SCTP_PARTIAL_DELIVERY_POINT:
6114 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6117 case SCTP_MAX_BURST:
6118 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6121 case SCTP_AUTH_CHUNK:
6122 case SCTP_AUTH_DELETE_KEY:
6123 retval = -EOPNOTSUPP;
6125 case SCTP_HMAC_IDENT:
6126 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6128 case SCTP_AUTH_ACTIVE_KEY:
6129 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6131 case SCTP_PEER_AUTH_CHUNKS:
6132 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6135 case SCTP_LOCAL_AUTH_CHUNKS:
6136 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6139 case SCTP_GET_ASSOC_NUMBER:
6140 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6142 case SCTP_GET_ASSOC_ID_LIST:
6143 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6145 case SCTP_AUTO_ASCONF:
6146 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6148 case SCTP_PEER_ADDR_THLDS:
6149 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6151 case SCTP_GET_ASSOC_STATS:
6152 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6154 case SCTP_RECVRCVINFO:
6155 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6157 case SCTP_RECVNXTINFO:
6158 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6161 retval = -ENOPROTOOPT;
6169 static void sctp_hash(struct sock *sk)
6174 static void sctp_unhash(struct sock *sk)
6179 /* Check if port is acceptable. Possibly find first available port.
6181 * The port hash table (contained in the 'global' SCTP protocol storage
6182 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6183 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6184 * list (the list number is the port number hashed out, so as you
6185 * would expect from a hash function, all the ports in a given list have
6186 * such a number that hashes out to the same list number; you were
6187 * expecting that, right?); so each list has a set of ports, with a
6188 * link to the socket (struct sock) that uses it, the port number and
6189 * a fastreuse flag (FIXME: NPI ipg).
6191 static struct sctp_bind_bucket *sctp_bucket_create(
6192 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6194 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6196 struct sctp_bind_hashbucket *head; /* hash list */
6197 struct sctp_bind_bucket *pp;
6198 unsigned short snum;
6201 snum = ntohs(addr->v4.sin_port);
6203 pr_debug("%s: begins, snum:%d\n", __func__, snum);
6208 /* Search for an available port. */
6209 int low, high, remaining, index;
6211 struct net *net = sock_net(sk);
6213 inet_get_local_port_range(net, &low, &high);
6214 remaining = (high - low) + 1;
6215 rover = prandom_u32() % remaining + low;
6219 if ((rover < low) || (rover > high))
6221 if (inet_is_local_reserved_port(net, rover))
6223 index = sctp_phashfn(sock_net(sk), rover);
6224 head = &sctp_port_hashtable[index];
6225 spin_lock(&head->lock);
6226 sctp_for_each_hentry(pp, &head->chain)
6227 if ((pp->port == rover) &&
6228 net_eq(sock_net(sk), pp->net))
6232 spin_unlock(&head->lock);
6233 } while (--remaining > 0);
6235 /* Exhausted local port range during search? */
6240 /* OK, here is the one we will use. HEAD (the port
6241 * hash table list entry) is non-NULL and we hold it's
6246 /* We are given an specific port number; we verify
6247 * that it is not being used. If it is used, we will
6248 * exahust the search in the hash list corresponding
6249 * to the port number (snum) - we detect that with the
6250 * port iterator, pp being NULL.
6252 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6253 spin_lock(&head->lock);
6254 sctp_for_each_hentry(pp, &head->chain) {
6255 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6262 if (!hlist_empty(&pp->owner)) {
6263 /* We had a port hash table hit - there is an
6264 * available port (pp != NULL) and it is being
6265 * used by other socket (pp->owner not empty); that other
6266 * socket is going to be sk2.
6268 int reuse = sk->sk_reuse;
6271 pr_debug("%s: found a possible match\n", __func__);
6273 if (pp->fastreuse && sk->sk_reuse &&
6274 sk->sk_state != SCTP_SS_LISTENING)
6277 /* Run through the list of sockets bound to the port
6278 * (pp->port) [via the pointers bind_next and
6279 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6280 * we get the endpoint they describe and run through
6281 * the endpoint's list of IP (v4 or v6) addresses,
6282 * comparing each of the addresses with the address of
6283 * the socket sk. If we find a match, then that means
6284 * that this port/socket (sk) combination are already
6287 sk_for_each_bound(sk2, &pp->owner) {
6288 struct sctp_endpoint *ep2;
6289 ep2 = sctp_sk(sk2)->ep;
6292 (reuse && sk2->sk_reuse &&
6293 sk2->sk_state != SCTP_SS_LISTENING))
6296 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6297 sctp_sk(sk2), sctp_sk(sk))) {
6303 pr_debug("%s: found a match\n", __func__);
6306 /* If there was a hash table miss, create a new port. */
6308 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6311 /* In either case (hit or miss), make sure fastreuse is 1 only
6312 * if sk->sk_reuse is too (that is, if the caller requested
6313 * SO_REUSEADDR on this socket -sk-).
6315 if (hlist_empty(&pp->owner)) {
6316 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6320 } else if (pp->fastreuse &&
6321 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6324 /* We are set, so fill up all the data in the hash table
6325 * entry, tie the socket list information with the rest of the
6326 * sockets FIXME: Blurry, NPI (ipg).
6329 if (!sctp_sk(sk)->bind_hash) {
6330 inet_sk(sk)->inet_num = snum;
6331 sk_add_bind_node(sk, &pp->owner);
6332 sctp_sk(sk)->bind_hash = pp;
6337 spin_unlock(&head->lock);
6344 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6345 * port is requested.
6347 static int sctp_get_port(struct sock *sk, unsigned short snum)
6349 union sctp_addr addr;
6350 struct sctp_af *af = sctp_sk(sk)->pf->af;
6352 /* Set up a dummy address struct from the sk. */
6353 af->from_sk(&addr, sk);
6354 addr.v4.sin_port = htons(snum);
6356 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6357 return !!sctp_get_port_local(sk, &addr);
6361 * Move a socket to LISTENING state.
6363 static int sctp_listen_start(struct sock *sk, int backlog)
6365 struct sctp_sock *sp = sctp_sk(sk);
6366 struct sctp_endpoint *ep = sp->ep;
6367 struct crypto_hash *tfm = NULL;
6370 /* Allocate HMAC for generating cookie. */
6371 if (!sp->hmac && sp->sctp_hmac_alg) {
6372 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6373 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6375 net_info_ratelimited("failed to load transform for %s: %ld\n",
6376 sp->sctp_hmac_alg, PTR_ERR(tfm));
6379 sctp_sk(sk)->hmac = tfm;
6383 * If a bind() or sctp_bindx() is not called prior to a listen()
6384 * call that allows new associations to be accepted, the system
6385 * picks an ephemeral port and will choose an address set equivalent
6386 * to binding with a wildcard address.
6388 * This is not currently spelled out in the SCTP sockets
6389 * extensions draft, but follows the practice as seen in TCP
6393 sk->sk_state = SCTP_SS_LISTENING;
6394 if (!ep->base.bind_addr.port) {
6395 if (sctp_autobind(sk))
6398 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6399 sk->sk_state = SCTP_SS_CLOSED;
6404 sk->sk_max_ack_backlog = backlog;
6405 sctp_hash_endpoint(ep);
6410 * 4.1.3 / 5.1.3 listen()
6412 * By default, new associations are not accepted for UDP style sockets.
6413 * An application uses listen() to mark a socket as being able to
6414 * accept new associations.
6416 * On TCP style sockets, applications use listen() to ready the SCTP
6417 * endpoint for accepting inbound associations.
6419 * On both types of endpoints a backlog of '0' disables listening.
6421 * Move a socket to LISTENING state.
6423 int sctp_inet_listen(struct socket *sock, int backlog)
6425 struct sock *sk = sock->sk;
6426 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6429 if (unlikely(backlog < 0))
6434 /* Peeled-off sockets are not allowed to listen(). */
6435 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6438 if (sock->state != SS_UNCONNECTED)
6441 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
6444 /* If backlog is zero, disable listening. */
6446 if (sctp_sstate(sk, CLOSED))
6450 sctp_unhash_endpoint(ep);
6451 sk->sk_state = SCTP_SS_CLOSED;
6453 sctp_sk(sk)->bind_hash->fastreuse = 1;
6457 /* If we are already listening, just update the backlog */
6458 if (sctp_sstate(sk, LISTENING))
6459 sk->sk_max_ack_backlog = backlog;
6461 err = sctp_listen_start(sk, backlog);
6473 * This function is done by modeling the current datagram_poll() and the
6474 * tcp_poll(). Note that, based on these implementations, we don't
6475 * lock the socket in this function, even though it seems that,
6476 * ideally, locking or some other mechanisms can be used to ensure
6477 * the integrity of the counters (sndbuf and wmem_alloc) used
6478 * in this place. We assume that we don't need locks either until proven
6481 * Another thing to note is that we include the Async I/O support
6482 * here, again, by modeling the current TCP/UDP code. We don't have
6483 * a good way to test with it yet.
6485 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6487 struct sock *sk = sock->sk;
6488 struct sctp_sock *sp = sctp_sk(sk);
6491 poll_wait(file, sk_sleep(sk), wait);
6493 /* A TCP-style listening socket becomes readable when the accept queue
6496 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6497 return (!list_empty(&sp->ep->asocs)) ?
6498 (POLLIN | POLLRDNORM) : 0;
6502 /* Is there any exceptional events? */
6503 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6505 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6506 if (sk->sk_shutdown & RCV_SHUTDOWN)
6507 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6508 if (sk->sk_shutdown == SHUTDOWN_MASK)
6511 /* Is it readable? Reconsider this code with TCP-style support. */
6512 if (!skb_queue_empty(&sk->sk_receive_queue))
6513 mask |= POLLIN | POLLRDNORM;
6515 /* The association is either gone or not ready. */
6516 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6519 /* Is it writable? */
6520 if (sctp_writeable(sk)) {
6521 mask |= POLLOUT | POLLWRNORM;
6523 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
6525 * Since the socket is not locked, the buffer
6526 * might be made available after the writeable check and
6527 * before the bit is set. This could cause a lost I/O
6528 * signal. tcp_poll() has a race breaker for this race
6529 * condition. Based on their implementation, we put
6530 * in the following code to cover it as well.
6532 if (sctp_writeable(sk))
6533 mask |= POLLOUT | POLLWRNORM;
6538 /********************************************************************
6539 * 2nd Level Abstractions
6540 ********************************************************************/
6542 static struct sctp_bind_bucket *sctp_bucket_create(
6543 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6545 struct sctp_bind_bucket *pp;
6547 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6549 SCTP_DBG_OBJCNT_INC(bind_bucket);
6552 INIT_HLIST_HEAD(&pp->owner);
6554 hlist_add_head(&pp->node, &head->chain);
6559 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6560 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6562 if (pp && hlist_empty(&pp->owner)) {
6563 __hlist_del(&pp->node);
6564 kmem_cache_free(sctp_bucket_cachep, pp);
6565 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6569 /* Release this socket's reference to a local port. */
6570 static inline void __sctp_put_port(struct sock *sk)
6572 struct sctp_bind_hashbucket *head =
6573 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6574 inet_sk(sk)->inet_num)];
6575 struct sctp_bind_bucket *pp;
6577 spin_lock(&head->lock);
6578 pp = sctp_sk(sk)->bind_hash;
6579 __sk_del_bind_node(sk);
6580 sctp_sk(sk)->bind_hash = NULL;
6581 inet_sk(sk)->inet_num = 0;
6582 sctp_bucket_destroy(pp);
6583 spin_unlock(&head->lock);
6586 void sctp_put_port(struct sock *sk)
6589 __sctp_put_port(sk);
6594 * The system picks an ephemeral port and choose an address set equivalent
6595 * to binding with a wildcard address.
6596 * One of those addresses will be the primary address for the association.
6597 * This automatically enables the multihoming capability of SCTP.
6599 static int sctp_autobind(struct sock *sk)
6601 union sctp_addr autoaddr;
6605 /* Initialize a local sockaddr structure to INADDR_ANY. */
6606 af = sctp_sk(sk)->pf->af;
6608 port = htons(inet_sk(sk)->inet_num);
6609 af->inaddr_any(&autoaddr, port);
6611 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6614 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6617 * 4.2 The cmsghdr Structure *
6619 * When ancillary data is sent or received, any number of ancillary data
6620 * objects can be specified by the msg_control and msg_controllen members of
6621 * the msghdr structure, because each object is preceded by
6622 * a cmsghdr structure defining the object's length (the cmsg_len member).
6623 * Historically Berkeley-derived implementations have passed only one object
6624 * at a time, but this API allows multiple objects to be
6625 * passed in a single call to sendmsg() or recvmsg(). The following example
6626 * shows two ancillary data objects in a control buffer.
6628 * |<--------------------------- msg_controllen -------------------------->|
6631 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6633 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6636 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6638 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6641 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6642 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6644 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6646 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6653 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6655 struct cmsghdr *cmsg;
6656 struct msghdr *my_msg = (struct msghdr *)msg;
6658 for_each_cmsghdr(cmsg, my_msg) {
6659 if (!CMSG_OK(my_msg, cmsg))
6662 /* Should we parse this header or ignore? */
6663 if (cmsg->cmsg_level != IPPROTO_SCTP)
6666 /* Strictly check lengths following example in SCM code. */
6667 switch (cmsg->cmsg_type) {
6669 /* SCTP Socket API Extension
6670 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
6672 * This cmsghdr structure provides information for
6673 * initializing new SCTP associations with sendmsg().
6674 * The SCTP_INITMSG socket option uses this same data
6675 * structure. This structure is not used for
6678 * cmsg_level cmsg_type cmsg_data[]
6679 * ------------ ------------ ----------------------
6680 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6682 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
6685 cmsgs->init = CMSG_DATA(cmsg);
6689 /* SCTP Socket API Extension
6690 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
6692 * This cmsghdr structure specifies SCTP options for
6693 * sendmsg() and describes SCTP header information
6694 * about a received message through recvmsg().
6696 * cmsg_level cmsg_type cmsg_data[]
6697 * ------------ ------------ ----------------------
6698 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6700 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6703 cmsgs->srinfo = CMSG_DATA(cmsg);
6705 if (cmsgs->srinfo->sinfo_flags &
6706 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6707 SCTP_SACK_IMMEDIATELY |
6708 SCTP_ABORT | SCTP_EOF))
6713 /* SCTP Socket API Extension
6714 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
6716 * This cmsghdr structure specifies SCTP options for
6717 * sendmsg(). This structure and SCTP_RCVINFO replaces
6718 * SCTP_SNDRCV which has been deprecated.
6720 * cmsg_level cmsg_type cmsg_data[]
6721 * ------------ ------------ ---------------------
6722 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
6724 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
6727 cmsgs->sinfo = CMSG_DATA(cmsg);
6729 if (cmsgs->sinfo->snd_flags &
6730 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6731 SCTP_SACK_IMMEDIATELY |
6732 SCTP_ABORT | SCTP_EOF))
6744 * Wait for a packet..
6745 * Note: This function is the same function as in core/datagram.c
6746 * with a few modifications to make lksctp work.
6748 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
6753 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6755 /* Socket errors? */
6756 error = sock_error(sk);
6760 if (!skb_queue_empty(&sk->sk_receive_queue))
6763 /* Socket shut down? */
6764 if (sk->sk_shutdown & RCV_SHUTDOWN)
6767 /* Sequenced packets can come disconnected. If so we report the
6772 /* Is there a good reason to think that we may receive some data? */
6773 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6776 /* Handle signals. */
6777 if (signal_pending(current))
6780 /* Let another process have a go. Since we are going to sleep
6781 * anyway. Note: This may cause odd behaviors if the message
6782 * does not fit in the user's buffer, but this seems to be the
6783 * only way to honor MSG_DONTWAIT realistically.
6786 *timeo_p = schedule_timeout(*timeo_p);
6790 finish_wait(sk_sleep(sk), &wait);
6794 error = sock_intr_errno(*timeo_p);
6797 finish_wait(sk_sleep(sk), &wait);
6802 /* Receive a datagram.
6803 * Note: This is pretty much the same routine as in core/datagram.c
6804 * with a few changes to make lksctp work.
6806 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6807 int noblock, int *err)
6810 struct sk_buff *skb;
6813 timeo = sock_rcvtimeo(sk, noblock);
6815 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
6816 MAX_SCHEDULE_TIMEOUT);
6819 /* Again only user level code calls this function,
6820 * so nothing interrupt level
6821 * will suddenly eat the receive_queue.
6823 * Look at current nfs client by the way...
6824 * However, this function was correct in any case. 8)
6826 if (flags & MSG_PEEK) {
6827 spin_lock_bh(&sk->sk_receive_queue.lock);
6828 skb = skb_peek(&sk->sk_receive_queue);
6830 atomic_inc(&skb->users);
6831 spin_unlock_bh(&sk->sk_receive_queue.lock);
6833 skb = skb_dequeue(&sk->sk_receive_queue);
6839 /* Caller is allowed not to check sk->sk_err before calling. */
6840 error = sock_error(sk);
6844 if (sk->sk_shutdown & RCV_SHUTDOWN)
6847 if (sk_can_busy_loop(sk) &&
6848 sk_busy_loop(sk, noblock))
6851 /* User doesn't want to wait. */
6855 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6864 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6865 static void __sctp_write_space(struct sctp_association *asoc)
6867 struct sock *sk = asoc->base.sk;
6869 if (sctp_wspace(asoc) <= 0)
6872 if (waitqueue_active(&asoc->wait))
6873 wake_up_interruptible(&asoc->wait);
6875 if (sctp_writeable(sk)) {
6876 struct socket_wq *wq;
6879 wq = rcu_dereference(sk->sk_wq);
6881 if (waitqueue_active(&wq->wait))
6882 wake_up_interruptible(&wq->wait);
6884 /* Note that we try to include the Async I/O support
6885 * here by modeling from the current TCP/UDP code.
6886 * We have not tested with it yet.
6888 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6889 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
6895 static void sctp_wake_up_waiters(struct sock *sk,
6896 struct sctp_association *asoc)
6898 struct sctp_association *tmp = asoc;
6900 /* We do accounting for the sndbuf space per association,
6901 * so we only need to wake our own association.
6903 if (asoc->ep->sndbuf_policy)
6904 return __sctp_write_space(asoc);
6906 /* If association goes down and is just flushing its
6907 * outq, then just normally notify others.
6909 if (asoc->base.dead)
6910 return sctp_write_space(sk);
6912 /* Accounting for the sndbuf space is per socket, so we
6913 * need to wake up others, try to be fair and in case of
6914 * other associations, let them have a go first instead
6915 * of just doing a sctp_write_space() call.
6917 * Note that we reach sctp_wake_up_waiters() only when
6918 * associations free up queued chunks, thus we are under
6919 * lock and the list of associations on a socket is
6920 * guaranteed not to change.
6922 for (tmp = list_next_entry(tmp, asocs); 1;
6923 tmp = list_next_entry(tmp, asocs)) {
6924 /* Manually skip the head element. */
6925 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
6927 /* Wake up association. */
6928 __sctp_write_space(tmp);
6929 /* We've reached the end. */
6935 /* Do accounting for the sndbuf space.
6936 * Decrement the used sndbuf space of the corresponding association by the
6937 * data size which was just transmitted(freed).
6939 static void sctp_wfree(struct sk_buff *skb)
6941 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
6942 struct sctp_association *asoc = chunk->asoc;
6943 struct sock *sk = asoc->base.sk;
6945 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6946 sizeof(struct sk_buff) +
6947 sizeof(struct sctp_chunk);
6949 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6952 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6954 sk->sk_wmem_queued -= skb->truesize;
6955 sk_mem_uncharge(sk, skb->truesize);
6958 sctp_wake_up_waiters(sk, asoc);
6960 sctp_association_put(asoc);
6963 /* Do accounting for the receive space on the socket.
6964 * Accounting for the association is done in ulpevent.c
6965 * We set this as a destructor for the cloned data skbs so that
6966 * accounting is done at the correct time.
6968 void sctp_sock_rfree(struct sk_buff *skb)
6970 struct sock *sk = skb->sk;
6971 struct sctp_ulpevent *event = sctp_skb2event(skb);
6973 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6976 * Mimic the behavior of sock_rfree
6978 sk_mem_uncharge(sk, event->rmem_len);
6982 /* Helper function to wait for space in the sndbuf. */
6983 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6986 struct sock *sk = asoc->base.sk;
6987 long current_timeo = *timeo_p;
6991 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
6994 /* Increment the association's refcnt. */
6995 sctp_association_hold(asoc);
6997 /* Wait on the association specific sndbuf space. */
6999 prepare_to_wait_exclusive(&asoc->wait, &wait,
7000 TASK_INTERRUPTIBLE);
7001 if (asoc->base.dead)
7005 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
7007 if (signal_pending(current))
7008 goto do_interrupted;
7009 if (msg_len <= sctp_wspace(asoc))
7012 /* Let another process have a go. Since we are going
7016 current_timeo = schedule_timeout(current_timeo);
7018 if (sk != asoc->base.sk)
7021 *timeo_p = current_timeo;
7025 finish_wait(&asoc->wait, &wait);
7027 /* Release the association's refcnt. */
7028 sctp_association_put(asoc);
7041 err = sock_intr_errno(*timeo_p);
7049 void sctp_data_ready(struct sock *sk)
7051 struct socket_wq *wq;
7054 wq = rcu_dereference(sk->sk_wq);
7055 if (wq_has_sleeper(wq))
7056 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7057 POLLRDNORM | POLLRDBAND);
7058 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7062 /* If socket sndbuf has changed, wake up all per association waiters. */
7063 void sctp_write_space(struct sock *sk)
7065 struct sctp_association *asoc;
7067 /* Wake up the tasks in each wait queue. */
7068 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7069 __sctp_write_space(asoc);
7073 /* Is there any sndbuf space available on the socket?
7075 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7076 * associations on the same socket. For a UDP-style socket with
7077 * multiple associations, it is possible for it to be "unwriteable"
7078 * prematurely. I assume that this is acceptable because
7079 * a premature "unwriteable" is better than an accidental "writeable" which
7080 * would cause an unwanted block under certain circumstances. For the 1-1
7081 * UDP-style sockets or TCP-style sockets, this code should work.
7084 static int sctp_writeable(struct sock *sk)
7088 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7094 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7095 * returns immediately with EINPROGRESS.
7097 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7099 struct sock *sk = asoc->base.sk;
7101 long current_timeo = *timeo_p;
7104 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7106 /* Increment the association's refcnt. */
7107 sctp_association_hold(asoc);
7110 prepare_to_wait_exclusive(&asoc->wait, &wait,
7111 TASK_INTERRUPTIBLE);
7114 if (sk->sk_shutdown & RCV_SHUTDOWN)
7116 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7119 if (signal_pending(current))
7120 goto do_interrupted;
7122 if (sctp_state(asoc, ESTABLISHED))
7125 /* Let another process have a go. Since we are going
7129 current_timeo = schedule_timeout(current_timeo);
7132 *timeo_p = current_timeo;
7136 finish_wait(&asoc->wait, &wait);
7138 /* Release the association's refcnt. */
7139 sctp_association_put(asoc);
7144 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7147 err = -ECONNREFUSED;
7151 err = sock_intr_errno(*timeo_p);
7159 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7161 struct sctp_endpoint *ep;
7165 ep = sctp_sk(sk)->ep;
7169 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
7170 TASK_INTERRUPTIBLE);
7172 if (list_empty(&ep->asocs)) {
7174 timeo = schedule_timeout(timeo);
7179 if (!sctp_sstate(sk, LISTENING))
7183 if (!list_empty(&ep->asocs))
7186 err = sock_intr_errno(timeo);
7187 if (signal_pending(current))
7195 finish_wait(sk_sleep(sk), &wait);
7200 static void sctp_wait_for_close(struct sock *sk, long timeout)
7205 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7206 if (list_empty(&sctp_sk(sk)->ep->asocs))
7209 timeout = schedule_timeout(timeout);
7211 } while (!signal_pending(current) && timeout);
7213 finish_wait(sk_sleep(sk), &wait);
7216 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
7218 struct sk_buff *frag;
7223 /* Don't forget the fragments. */
7224 skb_walk_frags(skb, frag)
7225 sctp_skb_set_owner_r_frag(frag, sk);
7228 sctp_skb_set_owner_r(skb, sk);
7231 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
7232 struct sctp_association *asoc)
7234 struct inet_sock *inet = inet_sk(sk);
7235 struct inet_sock *newinet;
7237 newsk->sk_type = sk->sk_type;
7238 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
7239 newsk->sk_flags = sk->sk_flags;
7240 newsk->sk_tsflags = sk->sk_tsflags;
7241 newsk->sk_no_check_tx = sk->sk_no_check_tx;
7242 newsk->sk_no_check_rx = sk->sk_no_check_rx;
7243 newsk->sk_reuse = sk->sk_reuse;
7245 newsk->sk_shutdown = sk->sk_shutdown;
7246 newsk->sk_destruct = sctp_destruct_sock;
7247 newsk->sk_family = sk->sk_family;
7248 newsk->sk_protocol = IPPROTO_SCTP;
7249 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
7250 newsk->sk_sndbuf = sk->sk_sndbuf;
7251 newsk->sk_rcvbuf = sk->sk_rcvbuf;
7252 newsk->sk_lingertime = sk->sk_lingertime;
7253 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
7254 newsk->sk_sndtimeo = sk->sk_sndtimeo;
7256 newinet = inet_sk(newsk);
7258 /* Initialize sk's sport, dport, rcv_saddr and daddr for
7259 * getsockname() and getpeername()
7261 newinet->inet_sport = inet->inet_sport;
7262 newinet->inet_saddr = inet->inet_saddr;
7263 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
7264 newinet->inet_dport = htons(asoc->peer.port);
7265 newinet->pmtudisc = inet->pmtudisc;
7266 newinet->inet_id = asoc->next_tsn ^ jiffies;
7268 newinet->uc_ttl = inet->uc_ttl;
7269 newinet->mc_loop = 1;
7270 newinet->mc_ttl = 1;
7271 newinet->mc_index = 0;
7272 newinet->mc_list = NULL;
7274 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
7275 net_enable_timestamp();
7277 security_sk_clone(sk, newsk);
7280 static inline void sctp_copy_descendant(struct sock *sk_to,
7281 const struct sock *sk_from)
7283 int ancestor_size = sizeof(struct inet_sock) +
7284 sizeof(struct sctp_sock) -
7285 offsetof(struct sctp_sock, auto_asconf_list);
7287 if (sk_from->sk_family == PF_INET6)
7288 ancestor_size += sizeof(struct ipv6_pinfo);
7290 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
7293 /* Populate the fields of the newsk from the oldsk and migrate the assoc
7294 * and its messages to the newsk.
7296 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
7297 struct sctp_association *assoc,
7298 sctp_socket_type_t type)
7300 struct sctp_sock *oldsp = sctp_sk(oldsk);
7301 struct sctp_sock *newsp = sctp_sk(newsk);
7302 struct sctp_bind_bucket *pp; /* hash list port iterator */
7303 struct sctp_endpoint *newep = newsp->ep;
7304 struct sk_buff *skb, *tmp;
7305 struct sctp_ulpevent *event;
7306 struct sctp_bind_hashbucket *head;
7308 /* Migrate socket buffer sizes and all the socket level options to the
7311 newsk->sk_sndbuf = oldsk->sk_sndbuf;
7312 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
7313 /* Brute force copy old sctp opt. */
7314 sctp_copy_descendant(newsk, oldsk);
7316 /* Restore the ep value that was overwritten with the above structure
7322 /* Hook this new socket in to the bind_hash list. */
7323 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
7324 inet_sk(oldsk)->inet_num)];
7326 spin_lock(&head->lock);
7327 pp = sctp_sk(oldsk)->bind_hash;
7328 sk_add_bind_node(newsk, &pp->owner);
7329 sctp_sk(newsk)->bind_hash = pp;
7330 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
7331 spin_unlock(&head->lock);
7334 /* Copy the bind_addr list from the original endpoint to the new
7335 * endpoint so that we can handle restarts properly
7337 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
7338 &oldsp->ep->base.bind_addr, GFP_KERNEL);
7340 /* Move any messages in the old socket's receive queue that are for the
7341 * peeled off association to the new socket's receive queue.
7343 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
7344 event = sctp_skb2event(skb);
7345 if (event->asoc == assoc) {
7346 __skb_unlink(skb, &oldsk->sk_receive_queue);
7347 __skb_queue_tail(&newsk->sk_receive_queue, skb);
7348 sctp_skb_set_owner_r_frag(skb, newsk);
7352 /* Clean up any messages pending delivery due to partial
7353 * delivery. Three cases:
7354 * 1) No partial deliver; no work.
7355 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
7356 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
7358 skb_queue_head_init(&newsp->pd_lobby);
7359 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
7361 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
7362 struct sk_buff_head *queue;
7364 /* Decide which queue to move pd_lobby skbs to. */
7365 if (assoc->ulpq.pd_mode) {
7366 queue = &newsp->pd_lobby;
7368 queue = &newsk->sk_receive_queue;
7370 /* Walk through the pd_lobby, looking for skbs that
7371 * need moved to the new socket.
7373 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
7374 event = sctp_skb2event(skb);
7375 if (event->asoc == assoc) {
7376 __skb_unlink(skb, &oldsp->pd_lobby);
7377 __skb_queue_tail(queue, skb);
7378 sctp_skb_set_owner_r_frag(skb, newsk);
7382 /* Clear up any skbs waiting for the partial
7383 * delivery to finish.
7385 if (assoc->ulpq.pd_mode)
7386 sctp_clear_pd(oldsk, NULL);
7390 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7391 sctp_skb_set_owner_r_frag(skb, newsk);
7393 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7394 sctp_skb_set_owner_r_frag(skb, newsk);
7396 /* Set the type of socket to indicate that it is peeled off from the
7397 * original UDP-style socket or created with the accept() call on a
7398 * TCP-style socket..
7402 /* Mark the new socket "in-use" by the user so that any packets
7403 * that may arrive on the association after we've moved it are
7404 * queued to the backlog. This prevents a potential race between
7405 * backlog processing on the old socket and new-packet processing
7406 * on the new socket.
7408 * The caller has just allocated newsk so we can guarantee that other
7409 * paths won't try to lock it and then oldsk.
7411 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7412 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
7413 sctp_assoc_migrate(assoc, newsk);
7414 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
7416 /* If the association on the newsk is already closed before accept()
7417 * is called, set RCV_SHUTDOWN flag.
7419 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7420 newsk->sk_shutdown |= RCV_SHUTDOWN;
7422 newsk->sk_state = SCTP_SS_ESTABLISHED;
7423 release_sock(newsk);
7427 /* This proto struct describes the ULP interface for SCTP. */
7428 struct proto sctp_prot = {
7430 .owner = THIS_MODULE,
7431 .close = sctp_close,
7432 .connect = sctp_connect,
7433 .disconnect = sctp_disconnect,
7434 .accept = sctp_accept,
7435 .ioctl = sctp_ioctl,
7436 .init = sctp_init_sock,
7437 .destroy = sctp_destroy_sock,
7438 .shutdown = sctp_shutdown,
7439 .setsockopt = sctp_setsockopt,
7440 .getsockopt = sctp_getsockopt,
7441 .sendmsg = sctp_sendmsg,
7442 .recvmsg = sctp_recvmsg,
7444 .backlog_rcv = sctp_backlog_rcv,
7446 .unhash = sctp_unhash,
7447 .get_port = sctp_get_port,
7448 .obj_size = sizeof(struct sctp_sock),
7449 .sysctl_mem = sysctl_sctp_mem,
7450 .sysctl_rmem = sysctl_sctp_rmem,
7451 .sysctl_wmem = sysctl_sctp_wmem,
7452 .memory_pressure = &sctp_memory_pressure,
7453 .enter_memory_pressure = sctp_enter_memory_pressure,
7454 .memory_allocated = &sctp_memory_allocated,
7455 .sockets_allocated = &sctp_sockets_allocated,
7458 #if IS_ENABLED(CONFIG_IPV6)
7460 #include <net/transp_v6.h>
7461 static void sctp_v6_destroy_sock(struct sock *sk)
7463 sctp_destroy_sock(sk);
7464 inet6_destroy_sock(sk);
7467 struct proto sctpv6_prot = {
7469 .owner = THIS_MODULE,
7470 .close = sctp_close,
7471 .connect = sctp_connect,
7472 .disconnect = sctp_disconnect,
7473 .accept = sctp_accept,
7474 .ioctl = sctp_ioctl,
7475 .init = sctp_init_sock,
7476 .destroy = sctp_v6_destroy_sock,
7477 .shutdown = sctp_shutdown,
7478 .setsockopt = sctp_setsockopt,
7479 .getsockopt = sctp_getsockopt,
7480 .sendmsg = sctp_sendmsg,
7481 .recvmsg = sctp_recvmsg,
7483 .backlog_rcv = sctp_backlog_rcv,
7485 .unhash = sctp_unhash,
7486 .get_port = sctp_get_port,
7487 .obj_size = sizeof(struct sctp6_sock),
7488 .sysctl_mem = sysctl_sctp_mem,
7489 .sysctl_rmem = sysctl_sctp_rmem,
7490 .sysctl_wmem = sysctl_sctp_wmem,
7491 .memory_pressure = &sctp_memory_pressure,
7492 .enter_memory_pressure = sctp_enter_memory_pressure,
7493 .memory_allocated = &sctp_memory_allocated,
7494 .sockets_allocated = &sctp_sockets_allocated,
7496 #endif /* IS_ENABLED(CONFIG_IPV6) */