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 <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
72 #include <net/route.h>
74 #include <net/inet_common.h>
75 #include <net/busy_poll.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <linux/export.h>
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
83 /* Forward declarations for internal helper functions. */
84 static int sctp_writeable(struct sock *sk);
85 static void sctp_wfree(struct sk_buff *skb);
86 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
87 size_t msg_len, struct sock **orig_sk);
88 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
89 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
90 static int sctp_wait_for_accept(struct sock *sk, long timeo);
91 static void sctp_wait_for_close(struct sock *sk, long timeo);
92 static void sctp_destruct_sock(struct sock *sk);
93 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
94 union sctp_addr *addr, int len);
95 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
96 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
97 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
99 static int sctp_send_asconf(struct sctp_association *asoc,
100 struct sctp_chunk *chunk);
101 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
102 static int sctp_autobind(struct sock *sk);
103 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
104 struct sctp_association *assoc,
105 enum sctp_socket_type type);
107 static unsigned long sctp_memory_pressure;
108 static atomic_long_t sctp_memory_allocated;
109 struct percpu_counter sctp_sockets_allocated;
111 static void sctp_enter_memory_pressure(struct sock *sk)
113 sctp_memory_pressure = 1;
117 /* Get the sndbuf space available at the time on the association. */
118 static inline int sctp_wspace(struct sctp_association *asoc)
122 if (asoc->ep->sndbuf_policy)
123 amt = asoc->sndbuf_used;
125 amt = sk_wmem_alloc_get(asoc->base.sk);
127 if (amt >= asoc->base.sk->sk_sndbuf) {
128 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
131 amt = sk_stream_wspace(asoc->base.sk);
136 amt = asoc->base.sk->sk_sndbuf - amt;
141 /* Increment the used sndbuf space count of the corresponding association by
142 * the size of the outgoing data chunk.
143 * Also, set the skb destructor for sndbuf accounting later.
145 * Since it is always 1-1 between chunk and skb, and also a new skb is always
146 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
147 * destructor in the data chunk skb for the purpose of the sndbuf space
150 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
152 struct sctp_association *asoc = chunk->asoc;
153 struct sock *sk = asoc->base.sk;
155 /* The sndbuf space is tracked per association. */
156 sctp_association_hold(asoc);
158 skb_set_owner_w(chunk->skb, sk);
160 chunk->skb->destructor = sctp_wfree;
161 /* Save the chunk pointer in skb for sctp_wfree to use later. */
162 skb_shinfo(chunk->skb)->destructor_arg = chunk;
164 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
165 sizeof(struct sk_buff) +
166 sizeof(struct sctp_chunk);
168 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
169 sk->sk_wmem_queued += chunk->skb->truesize;
170 sk_mem_charge(sk, chunk->skb->truesize);
173 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
175 skb_orphan(chunk->skb);
178 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
179 void (*cb)(struct sctp_chunk *))
182 struct sctp_outq *q = &asoc->outqueue;
183 struct sctp_transport *t;
184 struct sctp_chunk *chunk;
186 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
187 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
190 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
193 list_for_each_entry(chunk, &q->sacked, transmitted_list)
196 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
199 list_for_each_entry(chunk, &q->out_chunk_list, list)
203 /* Verify that this is a valid address. */
204 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
209 /* Verify basic sockaddr. */
210 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
214 /* Is this a valid SCTP address? */
215 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
218 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
224 /* Look up the association by its id. If this is not a UDP-style
225 * socket, the ID field is always ignored.
227 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
229 struct sctp_association *asoc = NULL;
231 /* If this is not a UDP-style socket, assoc id should be ignored. */
232 if (!sctp_style(sk, UDP)) {
233 /* Return NULL if the socket state is not ESTABLISHED. It
234 * could be a TCP-style listening socket or a socket which
235 * hasn't yet called connect() to establish an association.
237 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
240 /* Get the first and the only association from the list. */
241 if (!list_empty(&sctp_sk(sk)->ep->asocs))
242 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
243 struct sctp_association, asocs);
247 /* Otherwise this is a UDP-style socket. */
248 if (!id || (id == (sctp_assoc_t)-1))
251 spin_lock_bh(&sctp_assocs_id_lock);
252 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
253 spin_unlock_bh(&sctp_assocs_id_lock);
255 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
261 /* Look up the transport from an address and an assoc id. If both address and
262 * id are specified, the associations matching the address and the id should be
265 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
266 struct sockaddr_storage *addr,
269 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
270 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
271 union sctp_addr *laddr = (union sctp_addr *)addr;
272 struct sctp_transport *transport;
274 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
277 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
284 id_asoc = sctp_id2assoc(sk, id);
285 if (id_asoc && (id_asoc != addr_asoc))
288 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
289 (union sctp_addr *)addr);
294 /* API 3.1.2 bind() - UDP Style Syntax
295 * The syntax of bind() is,
297 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
299 * sd - the socket descriptor returned by socket().
300 * addr - the address structure (struct sockaddr_in or struct
301 * sockaddr_in6 [RFC 2553]),
302 * addr_len - the size of the address structure.
304 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
313 /* Disallow binding twice. */
314 if (!sctp_sk(sk)->ep->base.bind_addr.port)
315 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
325 static long sctp_get_port_local(struct sock *, union sctp_addr *);
327 /* Verify this is a valid sockaddr. */
328 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
329 union sctp_addr *addr, int len)
333 /* Check minimum size. */
334 if (len < sizeof (struct sockaddr))
337 /* V4 mapped address are really of AF_INET family */
338 if (addr->sa.sa_family == AF_INET6 &&
339 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
340 if (!opt->pf->af_supported(AF_INET, opt))
343 /* Does this PF support this AF? */
344 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
348 /* If we get this far, af is valid. */
349 af = sctp_get_af_specific(addr->sa.sa_family);
351 if (len < af->sockaddr_len)
357 /* Bind a local address either to an endpoint or to an association. */
358 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
360 struct net *net = sock_net(sk);
361 struct sctp_sock *sp = sctp_sk(sk);
362 struct sctp_endpoint *ep = sp->ep;
363 struct sctp_bind_addr *bp = &ep->base.bind_addr;
368 /* Common sockaddr verification. */
369 af = sctp_sockaddr_af(sp, addr, len);
371 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
372 __func__, sk, addr, len);
376 snum = ntohs(addr->v4.sin_port);
378 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
379 __func__, sk, &addr->sa, bp->port, snum, len);
381 /* PF specific bind() address verification. */
382 if (!sp->pf->bind_verify(sp, addr))
383 return -EADDRNOTAVAIL;
385 /* We must either be unbound, or bind to the same port.
386 * It's OK to allow 0 ports if we are already bound.
387 * We'll just inhert an already bound port in this case
392 else if (snum != bp->port) {
393 pr_debug("%s: new port %d doesn't match existing port "
394 "%d\n", __func__, snum, bp->port);
399 if (snum && snum < inet_prot_sock(net) &&
400 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
403 /* See if the address matches any of the addresses we may have
404 * already bound before checking against other endpoints.
406 if (sctp_bind_addr_match(bp, addr, sp))
409 /* Make sure we are allowed to bind here.
410 * The function sctp_get_port_local() does duplicate address
413 addr->v4.sin_port = htons(snum);
414 if ((ret = sctp_get_port_local(sk, addr))) {
418 /* Refresh ephemeral port. */
420 bp->port = inet_sk(sk)->inet_num;
422 /* Add the address to the bind address list.
423 * Use GFP_ATOMIC since BHs will be disabled.
425 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
426 SCTP_ADDR_SRC, GFP_ATOMIC);
428 /* Copy back into socket for getsockname() use. */
430 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
431 sp->pf->to_sk_saddr(addr, sk);
437 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
439 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
440 * at any one time. If a sender, after sending an ASCONF chunk, decides
441 * it needs to transfer another ASCONF Chunk, it MUST wait until the
442 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
443 * subsequent ASCONF. Note this restriction binds each side, so at any
444 * time two ASCONF may be in-transit on any given association (one sent
445 * from each endpoint).
447 static int sctp_send_asconf(struct sctp_association *asoc,
448 struct sctp_chunk *chunk)
450 struct net *net = sock_net(asoc->base.sk);
453 /* If there is an outstanding ASCONF chunk, queue it for later
456 if (asoc->addip_last_asconf) {
457 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
461 /* Hold the chunk until an ASCONF_ACK is received. */
462 sctp_chunk_hold(chunk);
463 retval = sctp_primitive_ASCONF(net, asoc, chunk);
465 sctp_chunk_free(chunk);
467 asoc->addip_last_asconf = chunk;
473 /* Add a list of addresses as bind addresses to local endpoint or
476 * Basically run through each address specified in the addrs/addrcnt
477 * array/length pair, determine if it is IPv6 or IPv4 and call
478 * sctp_do_bind() on it.
480 * If any of them fails, then the operation will be reversed and the
481 * ones that were added will be removed.
483 * Only sctp_setsockopt_bindx() is supposed to call this function.
485 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
490 struct sockaddr *sa_addr;
493 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
497 for (cnt = 0; cnt < addrcnt; cnt++) {
498 /* The list may contain either IPv4 or IPv6 address;
499 * determine the address length for walking thru the list.
502 af = sctp_get_af_specific(sa_addr->sa_family);
508 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
511 addr_buf += af->sockaddr_len;
515 /* Failed. Cleanup the ones that have been added */
517 sctp_bindx_rem(sk, addrs, cnt);
525 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
526 * associations that are part of the endpoint indicating that a list of local
527 * addresses are added to the endpoint.
529 * If any of the addresses is already in the bind address list of the
530 * association, we do not send the chunk for that association. But it will not
531 * affect other associations.
533 * Only sctp_setsockopt_bindx() is supposed to call this function.
535 static int sctp_send_asconf_add_ip(struct sock *sk,
536 struct sockaddr *addrs,
539 struct net *net = sock_net(sk);
540 struct sctp_sock *sp;
541 struct sctp_endpoint *ep;
542 struct sctp_association *asoc;
543 struct sctp_bind_addr *bp;
544 struct sctp_chunk *chunk;
545 struct sctp_sockaddr_entry *laddr;
546 union sctp_addr *addr;
547 union sctp_addr saveaddr;
554 if (!net->sctp.addip_enable)
560 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
561 __func__, sk, addrs, addrcnt);
563 list_for_each_entry(asoc, &ep->asocs, asocs) {
564 if (!asoc->peer.asconf_capable)
567 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
570 if (!sctp_state(asoc, ESTABLISHED))
573 /* Check if any address in the packed array of addresses is
574 * in the bind address list of the association. If so,
575 * do not send the asconf chunk to its peer, but continue with
576 * other associations.
579 for (i = 0; i < addrcnt; i++) {
581 af = sctp_get_af_specific(addr->v4.sin_family);
587 if (sctp_assoc_lookup_laddr(asoc, addr))
590 addr_buf += af->sockaddr_len;
595 /* Use the first valid address in bind addr list of
596 * association as Address Parameter of ASCONF CHUNK.
598 bp = &asoc->base.bind_addr;
599 p = bp->address_list.next;
600 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
601 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
602 addrcnt, SCTP_PARAM_ADD_IP);
608 /* Add the new addresses to the bind address list with
609 * use_as_src set to 0.
612 for (i = 0; i < addrcnt; i++) {
614 af = sctp_get_af_specific(addr->v4.sin_family);
615 memcpy(&saveaddr, addr, af->sockaddr_len);
616 retval = sctp_add_bind_addr(bp, &saveaddr,
618 SCTP_ADDR_NEW, GFP_ATOMIC);
619 addr_buf += af->sockaddr_len;
621 if (asoc->src_out_of_asoc_ok) {
622 struct sctp_transport *trans;
624 list_for_each_entry(trans,
625 &asoc->peer.transport_addr_list, transports) {
626 /* Clear the source and route cache */
627 sctp_transport_dst_release(trans);
628 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
629 2*asoc->pathmtu, 4380));
630 trans->ssthresh = asoc->peer.i.a_rwnd;
631 trans->rto = asoc->rto_initial;
632 sctp_max_rto(asoc, trans);
633 trans->rtt = trans->srtt = trans->rttvar = 0;
634 sctp_transport_route(trans, NULL,
635 sctp_sk(asoc->base.sk));
638 retval = sctp_send_asconf(asoc, chunk);
645 /* Remove a list of addresses from bind addresses list. Do not remove the
648 * Basically run through each address specified in the addrs/addrcnt
649 * array/length pair, determine if it is IPv6 or IPv4 and call
650 * sctp_del_bind() on it.
652 * If any of them fails, then the operation will be reversed and the
653 * ones that were removed will be added back.
655 * At least one address has to be left; if only one address is
656 * available, the operation will return -EBUSY.
658 * Only sctp_setsockopt_bindx() is supposed to call this function.
660 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
662 struct sctp_sock *sp = sctp_sk(sk);
663 struct sctp_endpoint *ep = sp->ep;
665 struct sctp_bind_addr *bp = &ep->base.bind_addr;
668 union sctp_addr *sa_addr;
671 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
672 __func__, sk, addrs, addrcnt);
675 for (cnt = 0; cnt < addrcnt; cnt++) {
676 /* If the bind address list is empty or if there is only one
677 * bind address, there is nothing more to be removed (we need
678 * at least one address here).
680 if (list_empty(&bp->address_list) ||
681 (sctp_list_single_entry(&bp->address_list))) {
687 af = sctp_get_af_specific(sa_addr->sa.sa_family);
693 if (!af->addr_valid(sa_addr, sp, NULL)) {
694 retval = -EADDRNOTAVAIL;
698 if (sa_addr->v4.sin_port &&
699 sa_addr->v4.sin_port != htons(bp->port)) {
704 if (!sa_addr->v4.sin_port)
705 sa_addr->v4.sin_port = htons(bp->port);
707 /* FIXME - There is probably a need to check if sk->sk_saddr and
708 * sk->sk_rcv_addr are currently set to one of the addresses to
709 * be removed. This is something which needs to be looked into
710 * when we are fixing the outstanding issues with multi-homing
711 * socket routing and failover schemes. Refer to comments in
712 * sctp_do_bind(). -daisy
714 retval = sctp_del_bind_addr(bp, sa_addr);
716 addr_buf += af->sockaddr_len;
719 /* Failed. Add the ones that has been removed back */
721 sctp_bindx_add(sk, addrs, cnt);
729 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
730 * the associations that are part of the endpoint indicating that a list of
731 * local addresses are removed from the endpoint.
733 * If any of the addresses is already in the bind address list of the
734 * association, we do not send the chunk for that association. But it will not
735 * affect other associations.
737 * Only sctp_setsockopt_bindx() is supposed to call this function.
739 static int sctp_send_asconf_del_ip(struct sock *sk,
740 struct sockaddr *addrs,
743 struct net *net = sock_net(sk);
744 struct sctp_sock *sp;
745 struct sctp_endpoint *ep;
746 struct sctp_association *asoc;
747 struct sctp_transport *transport;
748 struct sctp_bind_addr *bp;
749 struct sctp_chunk *chunk;
750 union sctp_addr *laddr;
753 struct sctp_sockaddr_entry *saddr;
759 if (!net->sctp.addip_enable)
765 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
766 __func__, sk, addrs, addrcnt);
768 list_for_each_entry(asoc, &ep->asocs, asocs) {
770 if (!asoc->peer.asconf_capable)
773 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776 if (!sctp_state(asoc, ESTABLISHED))
779 /* Check if any address in the packed array of addresses is
780 * not present in the bind address list of the association.
781 * If so, do not send the asconf chunk to its peer, but
782 * continue with other associations.
785 for (i = 0; i < addrcnt; i++) {
787 af = sctp_get_af_specific(laddr->v4.sin_family);
793 if (!sctp_assoc_lookup_laddr(asoc, laddr))
796 addr_buf += af->sockaddr_len;
801 /* Find one address in the association's bind address list
802 * that is not in the packed array of addresses. This is to
803 * make sure that we do not delete all the addresses in the
806 bp = &asoc->base.bind_addr;
807 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
809 if ((laddr == NULL) && (addrcnt == 1)) {
810 if (asoc->asconf_addr_del_pending)
812 asoc->asconf_addr_del_pending =
813 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
814 if (asoc->asconf_addr_del_pending == NULL) {
818 asoc->asconf_addr_del_pending->sa.sa_family =
820 asoc->asconf_addr_del_pending->v4.sin_port =
822 if (addrs->sa_family == AF_INET) {
823 struct sockaddr_in *sin;
825 sin = (struct sockaddr_in *)addrs;
826 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
827 } else if (addrs->sa_family == AF_INET6) {
828 struct sockaddr_in6 *sin6;
830 sin6 = (struct sockaddr_in6 *)addrs;
831 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
835 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
836 asoc->asconf_addr_del_pending);
838 asoc->src_out_of_asoc_ok = 1;
846 /* We do not need RCU protection throughout this loop
847 * because this is done under a socket lock from the
850 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
858 /* Reset use_as_src flag for the addresses in the bind address
859 * list that are to be deleted.
862 for (i = 0; i < addrcnt; i++) {
864 af = sctp_get_af_specific(laddr->v4.sin_family);
865 list_for_each_entry(saddr, &bp->address_list, list) {
866 if (sctp_cmp_addr_exact(&saddr->a, laddr))
867 saddr->state = SCTP_ADDR_DEL;
869 addr_buf += af->sockaddr_len;
872 /* Update the route and saddr entries for all the transports
873 * as some of the addresses in the bind address list are
874 * about to be deleted and cannot be used as source addresses.
876 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
878 sctp_transport_dst_release(transport);
879 sctp_transport_route(transport, NULL,
880 sctp_sk(asoc->base.sk));
884 /* We don't need to transmit ASCONF */
886 retval = sctp_send_asconf(asoc, chunk);
892 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
893 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
895 struct sock *sk = sctp_opt2sk(sp);
896 union sctp_addr *addr;
899 /* It is safe to write port space in caller. */
901 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
902 af = sctp_get_af_specific(addr->sa.sa_family);
905 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
908 if (addrw->state == SCTP_ADDR_NEW)
909 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
911 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
914 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
917 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
920 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
921 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
924 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
925 * Section 3.1.2 for this usage.
927 * addrs is a pointer to an array of one or more socket addresses. Each
928 * address is contained in its appropriate structure (i.e. struct
929 * sockaddr_in or struct sockaddr_in6) the family of the address type
930 * must be used to distinguish the address length (note that this
931 * representation is termed a "packed array" of addresses). The caller
932 * specifies the number of addresses in the array with addrcnt.
934 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
935 * -1, and sets errno to the appropriate error code.
937 * For SCTP, the port given in each socket address must be the same, or
938 * sctp_bindx() will fail, setting errno to EINVAL.
940 * The flags parameter is formed from the bitwise OR of zero or more of
941 * the following currently defined flags:
943 * SCTP_BINDX_ADD_ADDR
945 * SCTP_BINDX_REM_ADDR
947 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
948 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
949 * addresses from the association. The two flags are mutually exclusive;
950 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
951 * not remove all addresses from an association; sctp_bindx() will
952 * reject such an attempt with EINVAL.
954 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
955 * additional addresses with an endpoint after calling bind(). Or use
956 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
957 * socket is associated with so that no new association accepted will be
958 * associated with those addresses. If the endpoint supports dynamic
959 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
960 * endpoint to send the appropriate message to the peer to change the
961 * peers address lists.
963 * Adding and removing addresses from a connected association is
964 * optional functionality. Implementations that do not support this
965 * functionality should return EOPNOTSUPP.
967 * Basically do nothing but copying the addresses from user to kernel
968 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
969 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
972 * We don't use copy_from_user() for optimization: we first do the
973 * sanity checks (buffer size -fast- and access check-healthy
974 * pointer); if all of those succeed, then we can alloc the memory
975 * (expensive operation) needed to copy the data to kernel. Then we do
976 * the copying without checking the user space area
977 * (__copy_from_user()).
979 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
982 * sk The sk of the socket
983 * addrs The pointer to the addresses in user land
984 * addrssize Size of the addrs buffer
985 * op Operation to perform (add or remove, see the flags of
988 * Returns 0 if ok, <0 errno code on error.
990 static int sctp_setsockopt_bindx(struct sock *sk,
991 struct sockaddr __user *addrs,
992 int addrs_size, int op)
994 struct sockaddr *kaddrs;
998 struct sockaddr *sa_addr;
1002 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1003 __func__, sk, addrs, addrs_size, op);
1005 if (unlikely(addrs_size <= 0))
1008 /* Check the user passed a healthy pointer. */
1009 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1012 /* Alloc space for the address array in kernel memory. */
1013 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
1014 if (unlikely(!kaddrs))
1017 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1022 /* Walk through the addrs buffer and count the number of addresses. */
1024 while (walk_size < addrs_size) {
1025 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1031 af = sctp_get_af_specific(sa_addr->sa_family);
1033 /* If the address family is not supported or if this address
1034 * causes the address buffer to overflow return EINVAL.
1036 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1041 addr_buf += af->sockaddr_len;
1042 walk_size += af->sockaddr_len;
1047 case SCTP_BINDX_ADD_ADDR:
1048 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1051 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1054 case SCTP_BINDX_REM_ADDR:
1055 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1058 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1072 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1074 * Common routine for handling connect() and sctp_connectx().
1075 * Connect will come in with just a single address.
1077 static int __sctp_connect(struct sock *sk,
1078 struct sockaddr *kaddrs,
1080 sctp_assoc_t *assoc_id)
1082 struct net *net = sock_net(sk);
1083 struct sctp_sock *sp;
1084 struct sctp_endpoint *ep;
1085 struct sctp_association *asoc = NULL;
1086 struct sctp_association *asoc2;
1087 struct sctp_transport *transport;
1089 enum sctp_scope scope;
1094 union sctp_addr *sa_addr = NULL;
1096 unsigned short port;
1097 unsigned int f_flags = 0;
1102 /* connect() cannot be done on a socket that is already in ESTABLISHED
1103 * state - UDP-style peeled off socket or a TCP-style socket that
1104 * is already connected.
1105 * It cannot be done even on a TCP-style listening socket.
1107 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1108 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1113 /* Walk through the addrs buffer and count the number of addresses. */
1115 while (walk_size < addrs_size) {
1118 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1124 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1126 /* If the address family is not supported or if this address
1127 * causes the address buffer to overflow return EINVAL.
1129 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1134 port = ntohs(sa_addr->v4.sin_port);
1136 /* Save current address so we can work with it */
1137 memcpy(&to, sa_addr, af->sockaddr_len);
1139 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1143 /* Make sure the destination port is correctly set
1146 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1151 /* Check if there already is a matching association on the
1152 * endpoint (other than the one created here).
1154 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1155 if (asoc2 && asoc2 != asoc) {
1156 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1163 /* If we could not find a matching association on the endpoint,
1164 * make sure that there is no peeled-off association matching
1165 * the peer address even on another socket.
1167 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1168 err = -EADDRNOTAVAIL;
1173 /* If a bind() or sctp_bindx() is not called prior to
1174 * an sctp_connectx() call, the system picks an
1175 * ephemeral port and will choose an address set
1176 * equivalent to binding with a wildcard address.
1178 if (!ep->base.bind_addr.port) {
1179 if (sctp_autobind(sk)) {
1185 * If an unprivileged user inherits a 1-many
1186 * style socket with open associations on a
1187 * privileged port, it MAY be permitted to
1188 * accept new associations, but it SHOULD NOT
1189 * be permitted to open new associations.
1191 if (ep->base.bind_addr.port <
1192 inet_prot_sock(net) &&
1193 !ns_capable(net->user_ns,
1194 CAP_NET_BIND_SERVICE)) {
1200 scope = sctp_scope(&to);
1201 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1207 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1215 /* Prime the peer's transport structures. */
1216 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1224 addr_buf += af->sockaddr_len;
1225 walk_size += af->sockaddr_len;
1228 /* In case the user of sctp_connectx() wants an association
1229 * id back, assign one now.
1232 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1237 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1242 /* Initialize sk's dport and daddr for getpeername() */
1243 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1244 sp->pf->to_sk_daddr(sa_addr, sk);
1247 /* in-kernel sockets don't generally have a file allocated to them
1248 * if all they do is call sock_create_kern().
1250 if (sk->sk_socket->file)
1251 f_flags = sk->sk_socket->file->f_flags;
1253 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1256 *assoc_id = asoc->assoc_id;
1257 err = sctp_wait_for_connect(asoc, &timeo);
1258 /* Note: the asoc may be freed after the return of
1259 * sctp_wait_for_connect.
1262 /* Don't free association on exit. */
1266 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1267 __func__, asoc, kaddrs, err);
1270 /* sctp_primitive_ASSOCIATE may have added this association
1271 * To the hash table, try to unhash it, just in case, its a noop
1272 * if it wasn't hashed so we're safe
1274 sctp_association_free(asoc);
1279 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1282 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1283 * sctp_assoc_t *asoc);
1285 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1286 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1287 * or IPv6 addresses.
1289 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1290 * Section 3.1.2 for this usage.
1292 * addrs is a pointer to an array of one or more socket addresses. Each
1293 * address is contained in its appropriate structure (i.e. struct
1294 * sockaddr_in or struct sockaddr_in6) the family of the address type
1295 * must be used to distengish the address length (note that this
1296 * representation is termed a "packed array" of addresses). The caller
1297 * specifies the number of addresses in the array with addrcnt.
1299 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1300 * the association id of the new association. On failure, sctp_connectx()
1301 * returns -1, and sets errno to the appropriate error code. The assoc_id
1302 * is not touched by the kernel.
1304 * For SCTP, the port given in each socket address must be the same, or
1305 * sctp_connectx() will fail, setting errno to EINVAL.
1307 * An application can use sctp_connectx to initiate an association with
1308 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1309 * allows a caller to specify multiple addresses at which a peer can be
1310 * reached. The way the SCTP stack uses the list of addresses to set up
1311 * the association is implementation dependent. This function only
1312 * specifies that the stack will try to make use of all the addresses in
1313 * the list when needed.
1315 * Note that the list of addresses passed in is only used for setting up
1316 * the association. It does not necessarily equal the set of addresses
1317 * the peer uses for the resulting association. If the caller wants to
1318 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1319 * retrieve them after the association has been set up.
1321 * Basically do nothing but copying the addresses from user to kernel
1322 * land and invoking either sctp_connectx(). This is used for tunneling
1323 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1325 * We don't use copy_from_user() for optimization: we first do the
1326 * sanity checks (buffer size -fast- and access check-healthy
1327 * pointer); if all of those succeed, then we can alloc the memory
1328 * (expensive operation) needed to copy the data to kernel. Then we do
1329 * the copying without checking the user space area
1330 * (__copy_from_user()).
1332 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1335 * sk The sk of the socket
1336 * addrs The pointer to the addresses in user land
1337 * addrssize Size of the addrs buffer
1339 * Returns >=0 if ok, <0 errno code on error.
1341 static int __sctp_setsockopt_connectx(struct sock *sk,
1342 struct sockaddr __user *addrs,
1344 sctp_assoc_t *assoc_id)
1346 struct sockaddr *kaddrs;
1347 gfp_t gfp = GFP_KERNEL;
1350 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1351 __func__, sk, addrs, addrs_size);
1353 if (unlikely(addrs_size <= 0))
1356 /* Check the user passed a healthy pointer. */
1357 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1360 /* Alloc space for the address array in kernel memory. */
1361 if (sk->sk_socket->file)
1362 gfp = GFP_USER | __GFP_NOWARN;
1363 kaddrs = kmalloc(addrs_size, gfp);
1364 if (unlikely(!kaddrs))
1367 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1370 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1379 * This is an older interface. It's kept for backward compatibility
1380 * to the option that doesn't provide association id.
1382 static int sctp_setsockopt_connectx_old(struct sock *sk,
1383 struct sockaddr __user *addrs,
1386 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1390 * New interface for the API. The since the API is done with a socket
1391 * option, to make it simple we feed back the association id is as a return
1392 * indication to the call. Error is always negative and association id is
1395 static int sctp_setsockopt_connectx(struct sock *sk,
1396 struct sockaddr __user *addrs,
1399 sctp_assoc_t assoc_id = 0;
1402 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1411 * New (hopefully final) interface for the API.
1412 * We use the sctp_getaddrs_old structure so that use-space library
1413 * can avoid any unnecessary allocations. The only different part
1414 * is that we store the actual length of the address buffer into the
1415 * addrs_num structure member. That way we can re-use the existing
1418 #ifdef CONFIG_COMPAT
1419 struct compat_sctp_getaddrs_old {
1420 sctp_assoc_t assoc_id;
1422 compat_uptr_t addrs; /* struct sockaddr * */
1426 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1427 char __user *optval,
1430 struct sctp_getaddrs_old param;
1431 sctp_assoc_t assoc_id = 0;
1434 #ifdef CONFIG_COMPAT
1435 if (in_compat_syscall()) {
1436 struct compat_sctp_getaddrs_old param32;
1438 if (len < sizeof(param32))
1440 if (copy_from_user(¶m32, optval, sizeof(param32)))
1443 param.assoc_id = param32.assoc_id;
1444 param.addr_num = param32.addr_num;
1445 param.addrs = compat_ptr(param32.addrs);
1449 if (len < sizeof(param))
1451 if (copy_from_user(¶m, optval, sizeof(param)))
1455 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1456 param.addrs, param.addr_num,
1458 if (err == 0 || err == -EINPROGRESS) {
1459 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1461 if (put_user(sizeof(assoc_id), optlen))
1468 /* API 3.1.4 close() - UDP Style Syntax
1469 * Applications use close() to perform graceful shutdown (as described in
1470 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1471 * by a UDP-style socket.
1475 * ret = close(int sd);
1477 * sd - the socket descriptor of the associations to be closed.
1479 * To gracefully shutdown a specific association represented by the
1480 * UDP-style socket, an application should use the sendmsg() call,
1481 * passing no user data, but including the appropriate flag in the
1482 * ancillary data (see Section xxxx).
1484 * If sd in the close() call is a branched-off socket representing only
1485 * one association, the shutdown is performed on that association only.
1487 * 4.1.6 close() - TCP Style Syntax
1489 * Applications use close() to gracefully close down an association.
1493 * int close(int sd);
1495 * sd - the socket descriptor of the association to be closed.
1497 * After an application calls close() on a socket descriptor, no further
1498 * socket operations will succeed on that descriptor.
1500 * API 7.1.4 SO_LINGER
1502 * An application using the TCP-style socket can use this option to
1503 * perform the SCTP ABORT primitive. The linger option structure is:
1506 * int l_onoff; // option on/off
1507 * int l_linger; // linger time
1510 * To enable the option, set l_onoff to 1. If the l_linger value is set
1511 * to 0, calling close() is the same as the ABORT primitive. If the
1512 * value is set to a negative value, the setsockopt() call will return
1513 * an error. If the value is set to a positive value linger_time, the
1514 * close() can be blocked for at most linger_time ms. If the graceful
1515 * shutdown phase does not finish during this period, close() will
1516 * return but the graceful shutdown phase continues in the system.
1518 static void sctp_close(struct sock *sk, long timeout)
1520 struct net *net = sock_net(sk);
1521 struct sctp_endpoint *ep;
1522 struct sctp_association *asoc;
1523 struct list_head *pos, *temp;
1524 unsigned int data_was_unread;
1526 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1528 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1529 sk->sk_shutdown = SHUTDOWN_MASK;
1530 sk->sk_state = SCTP_SS_CLOSING;
1532 ep = sctp_sk(sk)->ep;
1534 /* Clean up any skbs sitting on the receive queue. */
1535 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1536 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1538 /* Walk all associations on an endpoint. */
1539 list_for_each_safe(pos, temp, &ep->asocs) {
1540 asoc = list_entry(pos, struct sctp_association, asocs);
1542 if (sctp_style(sk, TCP)) {
1543 /* A closed association can still be in the list if
1544 * it belongs to a TCP-style listening socket that is
1545 * not yet accepted. If so, free it. If not, send an
1546 * ABORT or SHUTDOWN based on the linger options.
1548 if (sctp_state(asoc, CLOSED)) {
1549 sctp_association_free(asoc);
1554 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1555 !skb_queue_empty(&asoc->ulpq.reasm) ||
1556 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1557 struct sctp_chunk *chunk;
1559 chunk = sctp_make_abort_user(asoc, NULL, 0);
1560 sctp_primitive_ABORT(net, asoc, chunk);
1562 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1565 /* On a TCP-style socket, block for at most linger_time if set. */
1566 if (sctp_style(sk, TCP) && timeout)
1567 sctp_wait_for_close(sk, timeout);
1569 /* This will run the backlog queue. */
1572 /* Supposedly, no process has access to the socket, but
1573 * the net layers still may.
1574 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1575 * held and that should be grabbed before socket lock.
1577 spin_lock_bh(&net->sctp.addr_wq_lock);
1578 bh_lock_sock_nested(sk);
1580 /* Hold the sock, since sk_common_release() will put sock_put()
1581 * and we have just a little more cleanup.
1584 sk_common_release(sk);
1587 spin_unlock_bh(&net->sctp.addr_wq_lock);
1591 SCTP_DBG_OBJCNT_DEC(sock);
1594 /* Handle EPIPE error. */
1595 static int sctp_error(struct sock *sk, int flags, int err)
1598 err = sock_error(sk) ? : -EPIPE;
1599 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1600 send_sig(SIGPIPE, current, 0);
1604 /* API 3.1.3 sendmsg() - UDP Style Syntax
1606 * An application uses sendmsg() and recvmsg() calls to transmit data to
1607 * and receive data from its peer.
1609 * ssize_t sendmsg(int socket, const struct msghdr *message,
1612 * socket - the socket descriptor of the endpoint.
1613 * message - pointer to the msghdr structure which contains a single
1614 * user message and possibly some ancillary data.
1616 * See Section 5 for complete description of the data
1619 * flags - flags sent or received with the user message, see Section
1620 * 5 for complete description of the flags.
1622 * Note: This function could use a rewrite especially when explicit
1623 * connect support comes in.
1625 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1627 static int sctp_msghdr_parse(const struct msghdr *msg,
1628 struct sctp_cmsgs *cmsgs);
1630 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1632 struct net *net = sock_net(sk);
1633 struct sctp_sock *sp;
1634 struct sctp_endpoint *ep;
1635 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1636 struct sctp_transport *transport, *chunk_tp;
1637 struct sctp_chunk *chunk;
1639 struct sockaddr *msg_name = NULL;
1640 struct sctp_sndrcvinfo default_sinfo;
1641 struct sctp_sndrcvinfo *sinfo;
1642 struct sctp_initmsg *sinit;
1643 sctp_assoc_t associd = 0;
1644 struct sctp_cmsgs cmsgs = { NULL };
1645 enum sctp_scope scope;
1646 bool fill_sinfo_ttl = false, wait_connect = false;
1647 struct sctp_datamsg *datamsg;
1648 int msg_flags = msg->msg_flags;
1649 __u16 sinfo_flags = 0;
1657 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1660 /* We cannot send a message over a TCP-style listening socket. */
1661 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1666 /* Parse out the SCTP CMSGs. */
1667 err = sctp_msghdr_parse(msg, &cmsgs);
1669 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1673 /* Fetch the destination address for this packet. This
1674 * address only selects the association--it is not necessarily
1675 * the address we will send to.
1676 * For a peeled-off socket, msg_name is ignored.
1678 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1679 int msg_namelen = msg->msg_namelen;
1681 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1686 if (msg_namelen > sizeof(to))
1687 msg_namelen = sizeof(to);
1688 memcpy(&to, msg->msg_name, msg_namelen);
1689 msg_name = msg->msg_name;
1693 if (cmsgs.sinfo != NULL) {
1694 memset(&default_sinfo, 0, sizeof(default_sinfo));
1695 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1696 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1697 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1698 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1699 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1701 sinfo = &default_sinfo;
1702 fill_sinfo_ttl = true;
1704 sinfo = cmsgs.srinfo;
1706 /* Did the user specify SNDINFO/SNDRCVINFO? */
1708 sinfo_flags = sinfo->sinfo_flags;
1709 associd = sinfo->sinfo_assoc_id;
1712 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1713 msg_len, sinfo_flags);
1715 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1716 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1721 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1722 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1723 * If SCTP_ABORT is set, the message length could be non zero with
1724 * the msg_iov set to the user abort reason.
1726 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1727 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1732 /* If SCTP_ADDR_OVER is set, there must be an address
1733 * specified in msg_name.
1735 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1742 pr_debug("%s: about to look up association\n", __func__);
1746 /* If a msg_name has been specified, assume this is to be used. */
1748 /* Look for a matching association on the endpoint. */
1749 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1751 /* If we could not find a matching association on the
1752 * endpoint, make sure that it is not a TCP-style
1753 * socket that already has an association or there is
1754 * no peeled-off association on another socket.
1757 ((sctp_style(sk, TCP) &&
1758 (sctp_sstate(sk, ESTABLISHED) ||
1759 sctp_sstate(sk, CLOSING))) ||
1760 sctp_endpoint_is_peeled_off(ep, &to))) {
1761 err = -EADDRNOTAVAIL;
1765 asoc = sctp_id2assoc(sk, associd);
1773 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1775 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1776 * socket that has an association in CLOSED state. This can
1777 * happen when an accepted socket has an association that is
1780 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1785 if (sinfo_flags & SCTP_EOF) {
1786 pr_debug("%s: shutting down association:%p\n",
1789 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1793 if (sinfo_flags & SCTP_ABORT) {
1795 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1801 pr_debug("%s: aborting association:%p\n",
1804 sctp_primitive_ABORT(net, asoc, chunk);
1810 /* Do we need to create the association? */
1812 pr_debug("%s: there is no association yet\n", __func__);
1814 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1819 /* Check for invalid stream against the stream counts,
1820 * either the default or the user specified stream counts.
1823 if (!sinit || !sinit->sinit_num_ostreams) {
1824 /* Check against the defaults. */
1825 if (sinfo->sinfo_stream >=
1826 sp->initmsg.sinit_num_ostreams) {
1831 /* Check against the requested. */
1832 if (sinfo->sinfo_stream >=
1833 sinit->sinit_num_ostreams) {
1841 * API 3.1.2 bind() - UDP Style Syntax
1842 * If a bind() or sctp_bindx() is not called prior to a
1843 * sendmsg() call that initiates a new association, the
1844 * system picks an ephemeral port and will choose an address
1845 * set equivalent to binding with a wildcard address.
1847 if (!ep->base.bind_addr.port) {
1848 if (sctp_autobind(sk)) {
1854 * If an unprivileged user inherits a one-to-many
1855 * style socket with open associations on a privileged
1856 * port, it MAY be permitted to accept new associations,
1857 * but it SHOULD NOT be permitted to open new
1860 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1861 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1867 scope = sctp_scope(&to);
1868 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1874 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1880 /* If the SCTP_INIT ancillary data is specified, set all
1881 * the association init values accordingly.
1884 if (sinit->sinit_num_ostreams) {
1885 asoc->c.sinit_num_ostreams =
1886 sinit->sinit_num_ostreams;
1888 if (sinit->sinit_max_instreams) {
1889 asoc->c.sinit_max_instreams =
1890 sinit->sinit_max_instreams;
1892 if (sinit->sinit_max_attempts) {
1893 asoc->max_init_attempts
1894 = sinit->sinit_max_attempts;
1896 if (sinit->sinit_max_init_timeo) {
1897 asoc->max_init_timeo =
1898 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1902 /* Prime the peer's transport structures. */
1903 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1910 /* ASSERT: we have a valid association at this point. */
1911 pr_debug("%s: we have a valid association\n", __func__);
1914 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1915 * one with some defaults.
1917 memset(&default_sinfo, 0, sizeof(default_sinfo));
1918 default_sinfo.sinfo_stream = asoc->default_stream;
1919 default_sinfo.sinfo_flags = asoc->default_flags;
1920 default_sinfo.sinfo_ppid = asoc->default_ppid;
1921 default_sinfo.sinfo_context = asoc->default_context;
1922 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1923 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1925 sinfo = &default_sinfo;
1926 } else if (fill_sinfo_ttl) {
1927 /* In case SNDINFO was specified, we still need to fill
1928 * it with a default ttl from the assoc here.
1930 sinfo->sinfo_timetolive = asoc->default_timetolive;
1933 /* API 7.1.7, the sndbuf size per association bounds the
1934 * maximum size of data that can be sent in a single send call.
1936 if (msg_len > sk->sk_sndbuf) {
1941 if (asoc->pmtu_pending)
1942 sctp_assoc_pending_pmtu(asoc);
1944 /* If fragmentation is disabled and the message length exceeds the
1945 * association fragmentation point, return EMSGSIZE. The I-D
1946 * does not specify what this error is, but this looks like
1949 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1954 /* Check for invalid stream. */
1955 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1960 if (sctp_wspace(asoc) < msg_len)
1961 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1963 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1964 if (!sctp_wspace(asoc)) {
1965 /* sk can be changed by peel off when waiting for buf. */
1966 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len, &sk);
1968 if (err == -ESRCH) {
1969 /* asoc is already dead. */
1977 /* If an address is passed with the sendto/sendmsg call, it is used
1978 * to override the primary destination address in the TCP model, or
1979 * when SCTP_ADDR_OVER flag is set in the UDP model.
1981 if ((sctp_style(sk, TCP) && msg_name) ||
1982 (sinfo_flags & SCTP_ADDR_OVER)) {
1983 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1991 /* Auto-connect, if we aren't connected already. */
1992 if (sctp_state(asoc, CLOSED)) {
1993 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1997 wait_connect = true;
1998 pr_debug("%s: we associated primitively\n", __func__);
2001 /* Break the message into multiple chunks of maximum size. */
2002 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
2003 if (IS_ERR(datamsg)) {
2004 err = PTR_ERR(datamsg);
2007 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
2009 /* Now send the (possibly) fragmented message. */
2010 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2011 sctp_chunk_hold(chunk);
2013 /* Do accounting for the write space. */
2014 sctp_set_owner_w(chunk);
2016 chunk->transport = chunk_tp;
2019 /* Send it to the lower layers. Note: all chunks
2020 * must either fail or succeed. The lower layer
2021 * works that way today. Keep it that way or this
2024 err = sctp_primitive_SEND(net, asoc, datamsg);
2025 /* Did the lower layer accept the chunk? */
2027 sctp_datamsg_free(datamsg);
2031 pr_debug("%s: we sent primitively\n", __func__);
2033 sctp_datamsg_put(datamsg);
2036 if (unlikely(wait_connect)) {
2037 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
2038 sctp_wait_for_connect(asoc, &timeo);
2041 /* If we are already past ASSOCIATE, the lower
2042 * layers are responsible for association cleanup.
2048 sctp_association_free(asoc);
2053 return sctp_error(sk, msg_flags, err);
2060 err = sock_error(sk);
2070 /* This is an extended version of skb_pull() that removes the data from the
2071 * start of a skb even when data is spread across the list of skb's in the
2072 * frag_list. len specifies the total amount of data that needs to be removed.
2073 * when 'len' bytes could be removed from the skb, it returns 0.
2074 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2075 * could not be removed.
2077 static int sctp_skb_pull(struct sk_buff *skb, int len)
2079 struct sk_buff *list;
2080 int skb_len = skb_headlen(skb);
2083 if (len <= skb_len) {
2084 __skb_pull(skb, len);
2088 __skb_pull(skb, skb_len);
2090 skb_walk_frags(skb, list) {
2091 rlen = sctp_skb_pull(list, len);
2092 skb->len -= (len-rlen);
2093 skb->data_len -= (len-rlen);
2104 /* API 3.1.3 recvmsg() - UDP Style Syntax
2106 * ssize_t recvmsg(int socket, struct msghdr *message,
2109 * socket - the socket descriptor of the endpoint.
2110 * message - pointer to the msghdr structure which contains a single
2111 * user message and possibly some ancillary data.
2113 * See Section 5 for complete description of the data
2116 * flags - flags sent or received with the user message, see Section
2117 * 5 for complete description of the flags.
2119 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2120 int noblock, int flags, int *addr_len)
2122 struct sctp_ulpevent *event = NULL;
2123 struct sctp_sock *sp = sctp_sk(sk);
2124 struct sk_buff *skb, *head_skb;
2129 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2130 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2135 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2136 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2141 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2145 /* Get the total length of the skb including any skb's in the
2154 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2156 event = sctp_skb2event(skb);
2161 if (event->chunk && event->chunk->head_skb)
2162 head_skb = event->chunk->head_skb;
2165 sock_recv_ts_and_drops(msg, sk, head_skb);
2166 if (sctp_ulpevent_is_notification(event)) {
2167 msg->msg_flags |= MSG_NOTIFICATION;
2168 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2170 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2173 /* Check if we allow SCTP_NXTINFO. */
2174 if (sp->recvnxtinfo)
2175 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2176 /* Check if we allow SCTP_RCVINFO. */
2177 if (sp->recvrcvinfo)
2178 sctp_ulpevent_read_rcvinfo(event, msg);
2179 /* Check if we allow SCTP_SNDRCVINFO. */
2180 if (sp->subscribe.sctp_data_io_event)
2181 sctp_ulpevent_read_sndrcvinfo(event, msg);
2185 /* If skb's length exceeds the user's buffer, update the skb and
2186 * push it back to the receive_queue so that the next call to
2187 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2189 if (skb_len > copied) {
2190 msg->msg_flags &= ~MSG_EOR;
2191 if (flags & MSG_PEEK)
2193 sctp_skb_pull(skb, copied);
2194 skb_queue_head(&sk->sk_receive_queue, skb);
2196 /* When only partial message is copied to the user, increase
2197 * rwnd by that amount. If all the data in the skb is read,
2198 * rwnd is updated when the event is freed.
2200 if (!sctp_ulpevent_is_notification(event))
2201 sctp_assoc_rwnd_increase(event->asoc, copied);
2203 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2204 (event->msg_flags & MSG_EOR))
2205 msg->msg_flags |= MSG_EOR;
2207 msg->msg_flags &= ~MSG_EOR;
2210 if (flags & MSG_PEEK) {
2211 /* Release the skb reference acquired after peeking the skb in
2212 * sctp_skb_recv_datagram().
2216 /* Free the event which includes releasing the reference to
2217 * the owner of the skb, freeing the skb and updating the
2220 sctp_ulpevent_free(event);
2227 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2229 * This option is a on/off flag. If enabled no SCTP message
2230 * fragmentation will be performed. Instead if a message being sent
2231 * exceeds the current PMTU size, the message will NOT be sent and
2232 * instead a error will be indicated to the user.
2234 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2235 char __user *optval,
2236 unsigned int optlen)
2240 if (optlen < sizeof(int))
2243 if (get_user(val, (int __user *)optval))
2246 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2251 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2252 unsigned int optlen)
2254 struct sctp_association *asoc;
2255 struct sctp_ulpevent *event;
2257 if (optlen > sizeof(struct sctp_event_subscribe))
2259 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2262 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2263 * if there is no data to be sent or retransmit, the stack will
2264 * immediately send up this notification.
2266 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2267 &sctp_sk(sk)->subscribe)) {
2268 asoc = sctp_id2assoc(sk, 0);
2270 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2271 event = sctp_ulpevent_make_sender_dry_event(asoc,
2276 sctp_ulpq_tail_event(&asoc->ulpq, event);
2283 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2285 * This socket option is applicable to the UDP-style socket only. When
2286 * set it will cause associations that are idle for more than the
2287 * specified number of seconds to automatically close. An association
2288 * being idle is defined an association that has NOT sent or received
2289 * user data. The special value of '0' indicates that no automatic
2290 * close of any associations should be performed. The option expects an
2291 * integer defining the number of seconds of idle time before an
2292 * association is closed.
2294 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2295 unsigned int optlen)
2297 struct sctp_sock *sp = sctp_sk(sk);
2298 struct net *net = sock_net(sk);
2300 /* Applicable to UDP-style socket only */
2301 if (sctp_style(sk, TCP))
2303 if (optlen != sizeof(int))
2305 if (copy_from_user(&sp->autoclose, optval, optlen))
2308 if (sp->autoclose > net->sctp.max_autoclose)
2309 sp->autoclose = net->sctp.max_autoclose;
2314 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2316 * Applications can enable or disable heartbeats for any peer address of
2317 * an association, modify an address's heartbeat interval, force a
2318 * heartbeat to be sent immediately, and adjust the address's maximum
2319 * number of retransmissions sent before an address is considered
2320 * unreachable. The following structure is used to access and modify an
2321 * address's parameters:
2323 * struct sctp_paddrparams {
2324 * sctp_assoc_t spp_assoc_id;
2325 * struct sockaddr_storage spp_address;
2326 * uint32_t spp_hbinterval;
2327 * uint16_t spp_pathmaxrxt;
2328 * uint32_t spp_pathmtu;
2329 * uint32_t spp_sackdelay;
2330 * uint32_t spp_flags;
2333 * spp_assoc_id - (one-to-many style socket) This is filled in the
2334 * application, and identifies the association for
2336 * spp_address - This specifies which address is of interest.
2337 * spp_hbinterval - This contains the value of the heartbeat interval,
2338 * in milliseconds. If a value of zero
2339 * is present in this field then no changes are to
2340 * be made to this parameter.
2341 * spp_pathmaxrxt - This contains the maximum number of
2342 * retransmissions before this address shall be
2343 * considered unreachable. If a value of zero
2344 * is present in this field then no changes are to
2345 * be made to this parameter.
2346 * spp_pathmtu - When Path MTU discovery is disabled the value
2347 * specified here will be the "fixed" path mtu.
2348 * Note that if the spp_address field is empty
2349 * then all associations on this address will
2350 * have this fixed path mtu set upon them.
2352 * spp_sackdelay - When delayed sack is enabled, this value specifies
2353 * the number of milliseconds that sacks will be delayed
2354 * for. This value will apply to all addresses of an
2355 * association if the spp_address field is empty. Note
2356 * also, that if delayed sack is enabled and this
2357 * value is set to 0, no change is made to the last
2358 * recorded delayed sack timer value.
2360 * spp_flags - These flags are used to control various features
2361 * on an association. The flag field may contain
2362 * zero or more of the following options.
2364 * SPP_HB_ENABLE - Enable heartbeats on the
2365 * specified address. Note that if the address
2366 * field is empty all addresses for the association
2367 * have heartbeats enabled upon them.
2369 * SPP_HB_DISABLE - Disable heartbeats on the
2370 * speicifed address. Note that if the address
2371 * field is empty all addresses for the association
2372 * will have their heartbeats disabled. Note also
2373 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2374 * mutually exclusive, only one of these two should
2375 * be specified. Enabling both fields will have
2376 * undetermined results.
2378 * SPP_HB_DEMAND - Request a user initiated heartbeat
2379 * to be made immediately.
2381 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2382 * heartbeat delayis to be set to the value of 0
2385 * SPP_PMTUD_ENABLE - This field will enable PMTU
2386 * discovery upon the specified address. Note that
2387 * if the address feild is empty then all addresses
2388 * on the association are effected.
2390 * SPP_PMTUD_DISABLE - This field will disable PMTU
2391 * discovery upon the specified address. Note that
2392 * if the address feild is empty then all addresses
2393 * on the association are effected. Not also that
2394 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2395 * exclusive. Enabling both will have undetermined
2398 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2399 * on delayed sack. The time specified in spp_sackdelay
2400 * is used to specify the sack delay for this address. Note
2401 * that if spp_address is empty then all addresses will
2402 * enable delayed sack and take on the sack delay
2403 * value specified in spp_sackdelay.
2404 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2405 * off delayed sack. If the spp_address field is blank then
2406 * delayed sack is disabled for the entire association. Note
2407 * also that this field is mutually exclusive to
2408 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2411 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2412 struct sctp_transport *trans,
2413 struct sctp_association *asoc,
2414 struct sctp_sock *sp,
2417 int sackdelay_change)
2421 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2422 struct net *net = sock_net(trans->asoc->base.sk);
2424 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2429 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2430 * this field is ignored. Note also that a value of zero indicates
2431 * the current setting should be left unchanged.
2433 if (params->spp_flags & SPP_HB_ENABLE) {
2435 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2436 * set. This lets us use 0 value when this flag
2439 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2440 params->spp_hbinterval = 0;
2442 if (params->spp_hbinterval ||
2443 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2446 msecs_to_jiffies(params->spp_hbinterval);
2449 msecs_to_jiffies(params->spp_hbinterval);
2451 sp->hbinterval = params->spp_hbinterval;
2458 trans->param_flags =
2459 (trans->param_flags & ~SPP_HB) | hb_change;
2462 (asoc->param_flags & ~SPP_HB) | hb_change;
2465 (sp->param_flags & ~SPP_HB) | hb_change;
2469 /* When Path MTU discovery is disabled the value specified here will
2470 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2471 * include the flag SPP_PMTUD_DISABLE for this field to have any
2474 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2476 trans->pathmtu = params->spp_pathmtu;
2477 sctp_assoc_sync_pmtu(asoc);
2479 asoc->pathmtu = params->spp_pathmtu;
2481 sp->pathmtu = params->spp_pathmtu;
2487 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2488 (params->spp_flags & SPP_PMTUD_ENABLE);
2489 trans->param_flags =
2490 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2492 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2493 sctp_assoc_sync_pmtu(asoc);
2497 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2500 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2504 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2505 * value of this field is ignored. Note also that a value of zero
2506 * indicates the current setting should be left unchanged.
2508 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2511 msecs_to_jiffies(params->spp_sackdelay);
2514 msecs_to_jiffies(params->spp_sackdelay);
2516 sp->sackdelay = params->spp_sackdelay;
2520 if (sackdelay_change) {
2522 trans->param_flags =
2523 (trans->param_flags & ~SPP_SACKDELAY) |
2527 (asoc->param_flags & ~SPP_SACKDELAY) |
2531 (sp->param_flags & ~SPP_SACKDELAY) |
2536 /* Note that a value of zero indicates the current setting should be
2539 if (params->spp_pathmaxrxt) {
2541 trans->pathmaxrxt = params->spp_pathmaxrxt;
2543 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2545 sp->pathmaxrxt = params->spp_pathmaxrxt;
2552 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2553 char __user *optval,
2554 unsigned int optlen)
2556 struct sctp_paddrparams params;
2557 struct sctp_transport *trans = NULL;
2558 struct sctp_association *asoc = NULL;
2559 struct sctp_sock *sp = sctp_sk(sk);
2561 int hb_change, pmtud_change, sackdelay_change;
2563 if (optlen != sizeof(struct sctp_paddrparams))
2566 if (copy_from_user(¶ms, optval, optlen))
2569 /* Validate flags and value parameters. */
2570 hb_change = params.spp_flags & SPP_HB;
2571 pmtud_change = params.spp_flags & SPP_PMTUD;
2572 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2574 if (hb_change == SPP_HB ||
2575 pmtud_change == SPP_PMTUD ||
2576 sackdelay_change == SPP_SACKDELAY ||
2577 params.spp_sackdelay > 500 ||
2578 (params.spp_pathmtu &&
2579 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2582 /* If an address other than INADDR_ANY is specified, and
2583 * no transport is found, then the request is invalid.
2585 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2586 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2587 params.spp_assoc_id);
2592 /* Get association, if assoc_id != 0 and the socket is a one
2593 * to many style socket, and an association was not found, then
2594 * the id was invalid.
2596 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2597 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2600 /* Heartbeat demand can only be sent on a transport or
2601 * association, but not a socket.
2603 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2606 /* Process parameters. */
2607 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2608 hb_change, pmtud_change,
2614 /* If changes are for association, also apply parameters to each
2617 if (!trans && asoc) {
2618 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2620 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2621 hb_change, pmtud_change,
2629 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2631 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2634 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2636 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2640 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2642 * This option will effect the way delayed acks are performed. This
2643 * option allows you to get or set the delayed ack time, in
2644 * milliseconds. It also allows changing the delayed ack frequency.
2645 * Changing the frequency to 1 disables the delayed sack algorithm. If
2646 * the assoc_id is 0, then this sets or gets the endpoints default
2647 * values. If the assoc_id field is non-zero, then the set or get
2648 * effects the specified association for the one to many model (the
2649 * assoc_id field is ignored by the one to one model). Note that if
2650 * sack_delay or sack_freq are 0 when setting this option, then the
2651 * current values will remain unchanged.
2653 * struct sctp_sack_info {
2654 * sctp_assoc_t sack_assoc_id;
2655 * uint32_t sack_delay;
2656 * uint32_t sack_freq;
2659 * sack_assoc_id - This parameter, indicates which association the user
2660 * is performing an action upon. Note that if this field's value is
2661 * zero then the endpoints default value is changed (effecting future
2662 * associations only).
2664 * sack_delay - This parameter contains the number of milliseconds that
2665 * the user is requesting the delayed ACK timer be set to. Note that
2666 * this value is defined in the standard to be between 200 and 500
2669 * sack_freq - This parameter contains the number of packets that must
2670 * be received before a sack is sent without waiting for the delay
2671 * timer to expire. The default value for this is 2, setting this
2672 * value to 1 will disable the delayed sack algorithm.
2675 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2676 char __user *optval, unsigned int optlen)
2678 struct sctp_sack_info params;
2679 struct sctp_transport *trans = NULL;
2680 struct sctp_association *asoc = NULL;
2681 struct sctp_sock *sp = sctp_sk(sk);
2683 if (optlen == sizeof(struct sctp_sack_info)) {
2684 if (copy_from_user(¶ms, optval, optlen))
2687 if (params.sack_delay == 0 && params.sack_freq == 0)
2689 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2690 pr_warn_ratelimited(DEPRECATED
2692 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2693 "Use struct sctp_sack_info instead\n",
2694 current->comm, task_pid_nr(current));
2695 if (copy_from_user(¶ms, optval, optlen))
2698 if (params.sack_delay == 0)
2699 params.sack_freq = 1;
2701 params.sack_freq = 0;
2705 /* Validate value parameter. */
2706 if (params.sack_delay > 500)
2709 /* Get association, if sack_assoc_id != 0 and the socket is a one
2710 * to many style socket, and an association was not found, then
2711 * the id was invalid.
2713 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2714 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2717 if (params.sack_delay) {
2720 msecs_to_jiffies(params.sack_delay);
2722 sctp_spp_sackdelay_enable(asoc->param_flags);
2724 sp->sackdelay = params.sack_delay;
2726 sctp_spp_sackdelay_enable(sp->param_flags);
2730 if (params.sack_freq == 1) {
2733 sctp_spp_sackdelay_disable(asoc->param_flags);
2736 sctp_spp_sackdelay_disable(sp->param_flags);
2738 } else if (params.sack_freq > 1) {
2740 asoc->sackfreq = params.sack_freq;
2742 sctp_spp_sackdelay_enable(asoc->param_flags);
2744 sp->sackfreq = params.sack_freq;
2746 sctp_spp_sackdelay_enable(sp->param_flags);
2750 /* If change is for association, also apply to each transport. */
2752 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2754 if (params.sack_delay) {
2756 msecs_to_jiffies(params.sack_delay);
2757 trans->param_flags =
2758 sctp_spp_sackdelay_enable(trans->param_flags);
2760 if (params.sack_freq == 1) {
2761 trans->param_flags =
2762 sctp_spp_sackdelay_disable(trans->param_flags);
2763 } else if (params.sack_freq > 1) {
2764 trans->sackfreq = params.sack_freq;
2765 trans->param_flags =
2766 sctp_spp_sackdelay_enable(trans->param_flags);
2774 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2776 * Applications can specify protocol parameters for the default association
2777 * initialization. The option name argument to setsockopt() and getsockopt()
2780 * Setting initialization parameters is effective only on an unconnected
2781 * socket (for UDP-style sockets only future associations are effected
2782 * by the change). With TCP-style sockets, this option is inherited by
2783 * sockets derived from a listener socket.
2785 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2787 struct sctp_initmsg sinit;
2788 struct sctp_sock *sp = sctp_sk(sk);
2790 if (optlen != sizeof(struct sctp_initmsg))
2792 if (copy_from_user(&sinit, optval, optlen))
2795 if (sinit.sinit_num_ostreams)
2796 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2797 if (sinit.sinit_max_instreams)
2798 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2799 if (sinit.sinit_max_attempts)
2800 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2801 if (sinit.sinit_max_init_timeo)
2802 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2808 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2810 * Applications that wish to use the sendto() system call may wish to
2811 * specify a default set of parameters that would normally be supplied
2812 * through the inclusion of ancillary data. This socket option allows
2813 * such an application to set the default sctp_sndrcvinfo structure.
2814 * The application that wishes to use this socket option simply passes
2815 * in to this call the sctp_sndrcvinfo structure defined in Section
2816 * 5.2.2) The input parameters accepted by this call include
2817 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2818 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2819 * to this call if the caller is using the UDP model.
2821 static int sctp_setsockopt_default_send_param(struct sock *sk,
2822 char __user *optval,
2823 unsigned int optlen)
2825 struct sctp_sock *sp = sctp_sk(sk);
2826 struct sctp_association *asoc;
2827 struct sctp_sndrcvinfo info;
2829 if (optlen != sizeof(info))
2831 if (copy_from_user(&info, optval, optlen))
2833 if (info.sinfo_flags &
2834 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2835 SCTP_ABORT | SCTP_EOF))
2838 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2839 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2842 asoc->default_stream = info.sinfo_stream;
2843 asoc->default_flags = info.sinfo_flags;
2844 asoc->default_ppid = info.sinfo_ppid;
2845 asoc->default_context = info.sinfo_context;
2846 asoc->default_timetolive = info.sinfo_timetolive;
2848 sp->default_stream = info.sinfo_stream;
2849 sp->default_flags = info.sinfo_flags;
2850 sp->default_ppid = info.sinfo_ppid;
2851 sp->default_context = info.sinfo_context;
2852 sp->default_timetolive = info.sinfo_timetolive;
2858 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2859 * (SCTP_DEFAULT_SNDINFO)
2861 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2862 char __user *optval,
2863 unsigned int optlen)
2865 struct sctp_sock *sp = sctp_sk(sk);
2866 struct sctp_association *asoc;
2867 struct sctp_sndinfo info;
2869 if (optlen != sizeof(info))
2871 if (copy_from_user(&info, optval, optlen))
2873 if (info.snd_flags &
2874 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2875 SCTP_ABORT | SCTP_EOF))
2878 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2879 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2882 asoc->default_stream = info.snd_sid;
2883 asoc->default_flags = info.snd_flags;
2884 asoc->default_ppid = info.snd_ppid;
2885 asoc->default_context = info.snd_context;
2887 sp->default_stream = info.snd_sid;
2888 sp->default_flags = info.snd_flags;
2889 sp->default_ppid = info.snd_ppid;
2890 sp->default_context = info.snd_context;
2896 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2898 * Requests that the local SCTP stack use the enclosed peer address as
2899 * the association primary. The enclosed address must be one of the
2900 * association peer's addresses.
2902 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2903 unsigned int optlen)
2905 struct sctp_prim prim;
2906 struct sctp_transport *trans;
2908 if (optlen != sizeof(struct sctp_prim))
2911 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2914 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2918 sctp_assoc_set_primary(trans->asoc, trans);
2924 * 7.1.5 SCTP_NODELAY
2926 * Turn on/off any Nagle-like algorithm. This means that packets are
2927 * generally sent as soon as possible and no unnecessary delays are
2928 * introduced, at the cost of more packets in the network. Expects an
2929 * integer boolean flag.
2931 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2932 unsigned int optlen)
2936 if (optlen < sizeof(int))
2938 if (get_user(val, (int __user *)optval))
2941 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2947 * 7.1.1 SCTP_RTOINFO
2949 * The protocol parameters used to initialize and bound retransmission
2950 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2951 * and modify these parameters.
2952 * All parameters are time values, in milliseconds. A value of 0, when
2953 * modifying the parameters, indicates that the current value should not
2957 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2959 struct sctp_rtoinfo rtoinfo;
2960 struct sctp_association *asoc;
2961 unsigned long rto_min, rto_max;
2962 struct sctp_sock *sp = sctp_sk(sk);
2964 if (optlen != sizeof (struct sctp_rtoinfo))
2967 if (copy_from_user(&rtoinfo, optval, optlen))
2970 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2972 /* Set the values to the specific association */
2973 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2976 rto_max = rtoinfo.srto_max;
2977 rto_min = rtoinfo.srto_min;
2980 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2982 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2985 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2987 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2989 if (rto_min > rto_max)
2993 if (rtoinfo.srto_initial != 0)
2995 msecs_to_jiffies(rtoinfo.srto_initial);
2996 asoc->rto_max = rto_max;
2997 asoc->rto_min = rto_min;
2999 /* If there is no association or the association-id = 0
3000 * set the values to the endpoint.
3002 if (rtoinfo.srto_initial != 0)
3003 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3004 sp->rtoinfo.srto_max = rto_max;
3005 sp->rtoinfo.srto_min = rto_min;
3013 * 7.1.2 SCTP_ASSOCINFO
3015 * This option is used to tune the maximum retransmission attempts
3016 * of the association.
3017 * Returns an error if the new association retransmission value is
3018 * greater than the sum of the retransmission value of the peer.
3019 * See [SCTP] for more information.
3022 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3025 struct sctp_assocparams assocparams;
3026 struct sctp_association *asoc;
3028 if (optlen != sizeof(struct sctp_assocparams))
3030 if (copy_from_user(&assocparams, optval, optlen))
3033 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3035 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3038 /* Set the values to the specific association */
3040 if (assocparams.sasoc_asocmaxrxt != 0) {
3043 struct sctp_transport *peer_addr;
3045 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3047 path_sum += peer_addr->pathmaxrxt;
3051 /* Only validate asocmaxrxt if we have more than
3052 * one path/transport. We do this because path
3053 * retransmissions are only counted when we have more
3057 assocparams.sasoc_asocmaxrxt > path_sum)
3060 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3063 if (assocparams.sasoc_cookie_life != 0)
3064 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3066 /* Set the values to the endpoint */
3067 struct sctp_sock *sp = sctp_sk(sk);
3069 if (assocparams.sasoc_asocmaxrxt != 0)
3070 sp->assocparams.sasoc_asocmaxrxt =
3071 assocparams.sasoc_asocmaxrxt;
3072 if (assocparams.sasoc_cookie_life != 0)
3073 sp->assocparams.sasoc_cookie_life =
3074 assocparams.sasoc_cookie_life;
3080 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3082 * This socket option is a boolean flag which turns on or off mapped V4
3083 * addresses. If this option is turned on and the socket is type
3084 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3085 * If this option is turned off, then no mapping will be done of V4
3086 * addresses and a user will receive both PF_INET6 and PF_INET type
3087 * addresses on the socket.
3089 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3092 struct sctp_sock *sp = sctp_sk(sk);
3094 if (optlen < sizeof(int))
3096 if (get_user(val, (int __user *)optval))
3107 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3108 * This option will get or set the maximum size to put in any outgoing
3109 * SCTP DATA chunk. If a message is larger than this size it will be
3110 * fragmented by SCTP into the specified size. Note that the underlying
3111 * SCTP implementation may fragment into smaller sized chunks when the
3112 * PMTU of the underlying association is smaller than the value set by
3113 * the user. The default value for this option is '0' which indicates
3114 * the user is NOT limiting fragmentation and only the PMTU will effect
3115 * SCTP's choice of DATA chunk size. Note also that values set larger
3116 * than the maximum size of an IP datagram will effectively let SCTP
3117 * control fragmentation (i.e. the same as setting this option to 0).
3119 * The following structure is used to access and modify this parameter:
3121 * struct sctp_assoc_value {
3122 * sctp_assoc_t assoc_id;
3123 * uint32_t assoc_value;
3126 * assoc_id: This parameter is ignored for one-to-one style sockets.
3127 * For one-to-many style sockets this parameter indicates which
3128 * association the user is performing an action upon. Note that if
3129 * this field's value is zero then the endpoints default value is
3130 * changed (effecting future associations only).
3131 * assoc_value: This parameter specifies the maximum size in bytes.
3133 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3135 struct sctp_assoc_value params;
3136 struct sctp_association *asoc;
3137 struct sctp_sock *sp = sctp_sk(sk);
3140 if (optlen == sizeof(int)) {
3141 pr_warn_ratelimited(DEPRECATED
3143 "Use of int in maxseg socket option.\n"
3144 "Use struct sctp_assoc_value instead\n",
3145 current->comm, task_pid_nr(current));
3146 if (copy_from_user(&val, optval, optlen))
3148 params.assoc_id = 0;
3149 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3150 if (copy_from_user(¶ms, optval, optlen))
3152 val = params.assoc_value;
3156 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3159 asoc = sctp_id2assoc(sk, params.assoc_id);
3160 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3165 val = asoc->pathmtu;
3166 val -= sp->pf->af->net_header_len;
3167 val -= sizeof(struct sctphdr) +
3168 sizeof(struct sctp_data_chunk);
3170 asoc->user_frag = val;
3171 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3173 sp->user_frag = val;
3181 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3183 * Requests that the peer mark the enclosed address as the association
3184 * primary. The enclosed address must be one of the association's
3185 * locally bound addresses. The following structure is used to make a
3186 * set primary request:
3188 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3189 unsigned int optlen)
3191 struct net *net = sock_net(sk);
3192 struct sctp_sock *sp;
3193 struct sctp_association *asoc = NULL;
3194 struct sctp_setpeerprim prim;
3195 struct sctp_chunk *chunk;
3201 if (!net->sctp.addip_enable)
3204 if (optlen != sizeof(struct sctp_setpeerprim))
3207 if (copy_from_user(&prim, optval, optlen))
3210 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3214 if (!asoc->peer.asconf_capable)
3217 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3220 if (!sctp_state(asoc, ESTABLISHED))
3223 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3227 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3228 return -EADDRNOTAVAIL;
3230 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3231 return -EADDRNOTAVAIL;
3233 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3234 chunk = sctp_make_asconf_set_prim(asoc,
3235 (union sctp_addr *)&prim.sspp_addr);
3239 err = sctp_send_asconf(asoc, chunk);
3241 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3246 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3247 unsigned int optlen)
3249 struct sctp_setadaptation adaptation;
3251 if (optlen != sizeof(struct sctp_setadaptation))
3253 if (copy_from_user(&adaptation, optval, optlen))
3256 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3262 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3264 * The context field in the sctp_sndrcvinfo structure is normally only
3265 * used when a failed message is retrieved holding the value that was
3266 * sent down on the actual send call. This option allows the setting of
3267 * a default context on an association basis that will be received on
3268 * reading messages from the peer. This is especially helpful in the
3269 * one-2-many model for an application to keep some reference to an
3270 * internal state machine that is processing messages on the
3271 * association. Note that the setting of this value only effects
3272 * received messages from the peer and does not effect the value that is
3273 * saved with outbound messages.
3275 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3276 unsigned int optlen)
3278 struct sctp_assoc_value params;
3279 struct sctp_sock *sp;
3280 struct sctp_association *asoc;
3282 if (optlen != sizeof(struct sctp_assoc_value))
3284 if (copy_from_user(¶ms, optval, optlen))
3289 if (params.assoc_id != 0) {
3290 asoc = sctp_id2assoc(sk, params.assoc_id);
3293 asoc->default_rcv_context = params.assoc_value;
3295 sp->default_rcv_context = params.assoc_value;
3302 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3304 * This options will at a minimum specify if the implementation is doing
3305 * fragmented interleave. Fragmented interleave, for a one to many
3306 * socket, is when subsequent calls to receive a message may return
3307 * parts of messages from different associations. Some implementations
3308 * may allow you to turn this value on or off. If so, when turned off,
3309 * no fragment interleave will occur (which will cause a head of line
3310 * blocking amongst multiple associations sharing the same one to many
3311 * socket). When this option is turned on, then each receive call may
3312 * come from a different association (thus the user must receive data
3313 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3314 * association each receive belongs to.
3316 * This option takes a boolean value. A non-zero value indicates that
3317 * fragmented interleave is on. A value of zero indicates that
3318 * fragmented interleave is off.
3320 * Note that it is important that an implementation that allows this
3321 * option to be turned on, have it off by default. Otherwise an unaware
3322 * application using the one to many model may become confused and act
3325 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3326 char __user *optval,
3327 unsigned int optlen)
3331 if (optlen != sizeof(int))
3333 if (get_user(val, (int __user *)optval))
3336 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3342 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3343 * (SCTP_PARTIAL_DELIVERY_POINT)
3345 * This option will set or get the SCTP partial delivery point. This
3346 * point is the size of a message where the partial delivery API will be
3347 * invoked to help free up rwnd space for the peer. Setting this to a
3348 * lower value will cause partial deliveries to happen more often. The
3349 * calls argument is an integer that sets or gets the partial delivery
3350 * point. Note also that the call will fail if the user attempts to set
3351 * this value larger than the socket receive buffer size.
3353 * Note that any single message having a length smaller than or equal to
3354 * the SCTP partial delivery point will be delivered in one single read
3355 * call as long as the user provided buffer is large enough to hold the
3358 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3359 char __user *optval,
3360 unsigned int optlen)
3364 if (optlen != sizeof(u32))
3366 if (get_user(val, (int __user *)optval))
3369 /* Note: We double the receive buffer from what the user sets
3370 * it to be, also initial rwnd is based on rcvbuf/2.
3372 if (val > (sk->sk_rcvbuf >> 1))
3375 sctp_sk(sk)->pd_point = val;
3377 return 0; /* is this the right error code? */
3381 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3383 * This option will allow a user to change the maximum burst of packets
3384 * that can be emitted by this association. Note that the default value
3385 * is 4, and some implementations may restrict this setting so that it
3386 * can only be lowered.
3388 * NOTE: This text doesn't seem right. Do this on a socket basis with
3389 * future associations inheriting the socket value.
3391 static int sctp_setsockopt_maxburst(struct sock *sk,
3392 char __user *optval,
3393 unsigned int optlen)
3395 struct sctp_assoc_value params;
3396 struct sctp_sock *sp;
3397 struct sctp_association *asoc;
3401 if (optlen == sizeof(int)) {
3402 pr_warn_ratelimited(DEPRECATED
3404 "Use of int in max_burst socket option deprecated.\n"
3405 "Use struct sctp_assoc_value instead\n",
3406 current->comm, task_pid_nr(current));
3407 if (copy_from_user(&val, optval, optlen))
3409 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3410 if (copy_from_user(¶ms, optval, optlen))
3412 val = params.assoc_value;
3413 assoc_id = params.assoc_id;
3419 if (assoc_id != 0) {
3420 asoc = sctp_id2assoc(sk, assoc_id);
3423 asoc->max_burst = val;
3425 sp->max_burst = val;
3431 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3433 * This set option adds a chunk type that the user is requesting to be
3434 * received only in an authenticated way. Changes to the list of chunks
3435 * will only effect future associations on the socket.
3437 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3438 char __user *optval,
3439 unsigned int optlen)
3441 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3442 struct sctp_authchunk val;
3444 if (!ep->auth_enable)
3447 if (optlen != sizeof(struct sctp_authchunk))
3449 if (copy_from_user(&val, optval, optlen))
3452 switch (val.sauth_chunk) {
3454 case SCTP_CID_INIT_ACK:
3455 case SCTP_CID_SHUTDOWN_COMPLETE:
3460 /* add this chunk id to the endpoint */
3461 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3465 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3467 * This option gets or sets the list of HMAC algorithms that the local
3468 * endpoint requires the peer to use.
3470 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3471 char __user *optval,
3472 unsigned int optlen)
3474 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3475 struct sctp_hmacalgo *hmacs;
3479 if (!ep->auth_enable)
3482 if (optlen < sizeof(struct sctp_hmacalgo))
3485 hmacs = memdup_user(optval, optlen);
3487 return PTR_ERR(hmacs);
3489 idents = hmacs->shmac_num_idents;
3490 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3491 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3496 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3503 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3505 * This option will set a shared secret key which is used to build an
3506 * association shared key.
3508 static int sctp_setsockopt_auth_key(struct sock *sk,
3509 char __user *optval,
3510 unsigned int optlen)
3512 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3513 struct sctp_authkey *authkey;
3514 struct sctp_association *asoc;
3517 if (!ep->auth_enable)
3520 if (optlen <= sizeof(struct sctp_authkey))
3523 authkey = memdup_user(optval, optlen);
3524 if (IS_ERR(authkey))
3525 return PTR_ERR(authkey);
3527 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3532 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3533 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3538 ret = sctp_auth_set_key(ep, asoc, authkey);
3545 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3547 * This option will get or set the active shared key to be used to build
3548 * the association shared key.
3550 static int sctp_setsockopt_active_key(struct sock *sk,
3551 char __user *optval,
3552 unsigned int optlen)
3554 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3555 struct sctp_authkeyid val;
3556 struct sctp_association *asoc;
3558 if (!ep->auth_enable)
3561 if (optlen != sizeof(struct sctp_authkeyid))
3563 if (copy_from_user(&val, optval, optlen))
3566 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3567 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3570 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3574 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3576 * This set option will delete a shared secret key from use.
3578 static int sctp_setsockopt_del_key(struct sock *sk,
3579 char __user *optval,
3580 unsigned int optlen)
3582 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3583 struct sctp_authkeyid val;
3584 struct sctp_association *asoc;
3586 if (!ep->auth_enable)
3589 if (optlen != sizeof(struct sctp_authkeyid))
3591 if (copy_from_user(&val, optval, optlen))
3594 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3595 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3598 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3603 * 8.1.23 SCTP_AUTO_ASCONF
3605 * This option will enable or disable the use of the automatic generation of
3606 * ASCONF chunks to add and delete addresses to an existing association. Note
3607 * that this option has two caveats namely: a) it only affects sockets that
3608 * are bound to all addresses available to the SCTP stack, and b) the system
3609 * administrator may have an overriding control that turns the ASCONF feature
3610 * off no matter what setting the socket option may have.
3611 * This option expects an integer boolean flag, where a non-zero value turns on
3612 * the option, and a zero value turns off the option.
3613 * Note. In this implementation, socket operation overrides default parameter
3614 * being set by sysctl as well as FreeBSD implementation
3616 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3617 unsigned int optlen)
3620 struct sctp_sock *sp = sctp_sk(sk);
3622 if (optlen < sizeof(int))
3624 if (get_user(val, (int __user *)optval))
3626 if (!sctp_is_ep_boundall(sk) && val)
3628 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3631 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3632 if (val == 0 && sp->do_auto_asconf) {
3633 list_del(&sp->auto_asconf_list);
3634 sp->do_auto_asconf = 0;
3635 } else if (val && !sp->do_auto_asconf) {
3636 list_add_tail(&sp->auto_asconf_list,
3637 &sock_net(sk)->sctp.auto_asconf_splist);
3638 sp->do_auto_asconf = 1;
3640 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3645 * SCTP_PEER_ADDR_THLDS
3647 * This option allows us to alter the partially failed threshold for one or all
3648 * transports in an association. See Section 6.1 of:
3649 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3651 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3652 char __user *optval,
3653 unsigned int optlen)
3655 struct sctp_paddrthlds val;
3656 struct sctp_transport *trans;
3657 struct sctp_association *asoc;
3659 if (optlen < sizeof(struct sctp_paddrthlds))
3661 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3662 sizeof(struct sctp_paddrthlds)))
3666 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3667 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3670 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3672 if (val.spt_pathmaxrxt)
3673 trans->pathmaxrxt = val.spt_pathmaxrxt;
3674 trans->pf_retrans = val.spt_pathpfthld;
3677 if (val.spt_pathmaxrxt)
3678 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3679 asoc->pf_retrans = val.spt_pathpfthld;
3681 trans = sctp_addr_id2transport(sk, &val.spt_address,
3686 if (val.spt_pathmaxrxt)
3687 trans->pathmaxrxt = val.spt_pathmaxrxt;
3688 trans->pf_retrans = val.spt_pathpfthld;
3694 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3695 char __user *optval,
3696 unsigned int optlen)
3700 if (optlen < sizeof(int))
3702 if (get_user(val, (int __user *) optval))
3705 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3710 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3711 char __user *optval,
3712 unsigned int optlen)
3716 if (optlen < sizeof(int))
3718 if (get_user(val, (int __user *) optval))
3721 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3726 static int sctp_setsockopt_pr_supported(struct sock *sk,
3727 char __user *optval,
3728 unsigned int optlen)
3730 struct sctp_assoc_value params;
3731 struct sctp_association *asoc;
3732 int retval = -EINVAL;
3734 if (optlen != sizeof(params))
3737 if (copy_from_user(¶ms, optval, optlen)) {
3742 asoc = sctp_id2assoc(sk, params.assoc_id);
3744 asoc->prsctp_enable = !!params.assoc_value;
3745 } else if (!params.assoc_id) {
3746 struct sctp_sock *sp = sctp_sk(sk);
3748 sp->ep->prsctp_enable = !!params.assoc_value;
3759 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3760 char __user *optval,
3761 unsigned int optlen)
3763 struct sctp_default_prinfo info;
3764 struct sctp_association *asoc;
3765 int retval = -EINVAL;
3767 if (optlen != sizeof(info))
3770 if (copy_from_user(&info, optval, sizeof(info))) {
3775 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3778 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3781 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3783 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3784 asoc->default_timetolive = info.pr_value;
3785 } else if (!info.pr_assoc_id) {
3786 struct sctp_sock *sp = sctp_sk(sk);
3788 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3789 sp->default_timetolive = info.pr_value;
3800 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3801 char __user *optval,
3802 unsigned int optlen)
3804 struct sctp_assoc_value params;
3805 struct sctp_association *asoc;
3806 int retval = -EINVAL;
3808 if (optlen != sizeof(params))
3811 if (copy_from_user(¶ms, optval, optlen)) {
3816 asoc = sctp_id2assoc(sk, params.assoc_id);
3818 asoc->reconf_enable = !!params.assoc_value;
3819 } else if (!params.assoc_id) {
3820 struct sctp_sock *sp = sctp_sk(sk);
3822 sp->ep->reconf_enable = !!params.assoc_value;
3833 static int sctp_setsockopt_enable_strreset(struct sock *sk,
3834 char __user *optval,
3835 unsigned int optlen)
3837 struct sctp_assoc_value params;
3838 struct sctp_association *asoc;
3839 int retval = -EINVAL;
3841 if (optlen != sizeof(params))
3844 if (copy_from_user(¶ms, optval, optlen)) {
3849 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3852 asoc = sctp_id2assoc(sk, params.assoc_id);
3854 asoc->strreset_enable = params.assoc_value;
3855 } else if (!params.assoc_id) {
3856 struct sctp_sock *sp = sctp_sk(sk);
3858 sp->ep->strreset_enable = params.assoc_value;
3869 static int sctp_setsockopt_reset_streams(struct sock *sk,
3870 char __user *optval,
3871 unsigned int optlen)
3873 struct sctp_reset_streams *params;
3874 struct sctp_association *asoc;
3875 int retval = -EINVAL;
3877 if (optlen < sizeof(struct sctp_reset_streams))
3880 params = memdup_user(optval, optlen);
3882 return PTR_ERR(params);
3884 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
3888 retval = sctp_send_reset_streams(asoc, params);
3895 static int sctp_setsockopt_reset_assoc(struct sock *sk,
3896 char __user *optval,
3897 unsigned int optlen)
3899 struct sctp_association *asoc;
3900 sctp_assoc_t associd;
3901 int retval = -EINVAL;
3903 if (optlen != sizeof(associd))
3906 if (copy_from_user(&associd, optval, optlen)) {
3911 asoc = sctp_id2assoc(sk, associd);
3915 retval = sctp_send_reset_assoc(asoc);
3921 static int sctp_setsockopt_add_streams(struct sock *sk,
3922 char __user *optval,
3923 unsigned int optlen)
3925 struct sctp_association *asoc;
3926 struct sctp_add_streams params;
3927 int retval = -EINVAL;
3929 if (optlen != sizeof(params))
3932 if (copy_from_user(¶ms, optval, optlen)) {
3937 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
3941 retval = sctp_send_add_streams(asoc, ¶ms);
3947 /* API 6.2 setsockopt(), getsockopt()
3949 * Applications use setsockopt() and getsockopt() to set or retrieve
3950 * socket options. Socket options are used to change the default
3951 * behavior of sockets calls. They are described in Section 7.
3955 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3956 * int __user *optlen);
3957 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3960 * sd - the socket descript.
3961 * level - set to IPPROTO_SCTP for all SCTP options.
3962 * optname - the option name.
3963 * optval - the buffer to store the value of the option.
3964 * optlen - the size of the buffer.
3966 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3967 char __user *optval, unsigned int optlen)
3971 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3973 /* I can hardly begin to describe how wrong this is. This is
3974 * so broken as to be worse than useless. The API draft
3975 * REALLY is NOT helpful here... I am not convinced that the
3976 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3977 * are at all well-founded.
3979 if (level != SOL_SCTP) {
3980 struct sctp_af *af = sctp_sk(sk)->pf->af;
3981 retval = af->setsockopt(sk, level, optname, optval, optlen);
3988 case SCTP_SOCKOPT_BINDX_ADD:
3989 /* 'optlen' is the size of the addresses buffer. */
3990 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3991 optlen, SCTP_BINDX_ADD_ADDR);
3994 case SCTP_SOCKOPT_BINDX_REM:
3995 /* 'optlen' is the size of the addresses buffer. */
3996 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3997 optlen, SCTP_BINDX_REM_ADDR);
4000 case SCTP_SOCKOPT_CONNECTX_OLD:
4001 /* 'optlen' is the size of the addresses buffer. */
4002 retval = sctp_setsockopt_connectx_old(sk,
4003 (struct sockaddr __user *)optval,
4007 case SCTP_SOCKOPT_CONNECTX:
4008 /* 'optlen' is the size of the addresses buffer. */
4009 retval = sctp_setsockopt_connectx(sk,
4010 (struct sockaddr __user *)optval,
4014 case SCTP_DISABLE_FRAGMENTS:
4015 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4019 retval = sctp_setsockopt_events(sk, optval, optlen);
4022 case SCTP_AUTOCLOSE:
4023 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4026 case SCTP_PEER_ADDR_PARAMS:
4027 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4030 case SCTP_DELAYED_SACK:
4031 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4033 case SCTP_PARTIAL_DELIVERY_POINT:
4034 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4038 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4040 case SCTP_DEFAULT_SEND_PARAM:
4041 retval = sctp_setsockopt_default_send_param(sk, optval,
4044 case SCTP_DEFAULT_SNDINFO:
4045 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4047 case SCTP_PRIMARY_ADDR:
4048 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4050 case SCTP_SET_PEER_PRIMARY_ADDR:
4051 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4054 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4057 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4059 case SCTP_ASSOCINFO:
4060 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4062 case SCTP_I_WANT_MAPPED_V4_ADDR:
4063 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4066 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4068 case SCTP_ADAPTATION_LAYER:
4069 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4072 retval = sctp_setsockopt_context(sk, optval, optlen);
4074 case SCTP_FRAGMENT_INTERLEAVE:
4075 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4077 case SCTP_MAX_BURST:
4078 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4080 case SCTP_AUTH_CHUNK:
4081 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4083 case SCTP_HMAC_IDENT:
4084 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4087 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4089 case SCTP_AUTH_ACTIVE_KEY:
4090 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4092 case SCTP_AUTH_DELETE_KEY:
4093 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4095 case SCTP_AUTO_ASCONF:
4096 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4098 case SCTP_PEER_ADDR_THLDS:
4099 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4101 case SCTP_RECVRCVINFO:
4102 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4104 case SCTP_RECVNXTINFO:
4105 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4107 case SCTP_PR_SUPPORTED:
4108 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4110 case SCTP_DEFAULT_PRINFO:
4111 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4113 case SCTP_RECONFIG_SUPPORTED:
4114 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4116 case SCTP_ENABLE_STREAM_RESET:
4117 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4119 case SCTP_RESET_STREAMS:
4120 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4122 case SCTP_RESET_ASSOC:
4123 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4125 case SCTP_ADD_STREAMS:
4126 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4129 retval = -ENOPROTOOPT;
4139 /* API 3.1.6 connect() - UDP Style Syntax
4141 * An application may use the connect() call in the UDP model to initiate an
4142 * association without sending data.
4146 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4148 * sd: the socket descriptor to have a new association added to.
4150 * nam: the address structure (either struct sockaddr_in or struct
4151 * sockaddr_in6 defined in RFC2553 [7]).
4153 * len: the size of the address.
4155 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4163 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4166 /* Validate addr_len before calling common connect/connectx routine. */
4167 af = sctp_get_af_specific(addr->sa_family);
4168 if (!af || addr_len < af->sockaddr_len) {
4171 /* Pass correct addr len to common routine (so it knows there
4172 * is only one address being passed.
4174 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
4181 /* FIXME: Write comments. */
4182 static int sctp_disconnect(struct sock *sk, int flags)
4184 return -EOPNOTSUPP; /* STUB */
4187 /* 4.1.4 accept() - TCP Style Syntax
4189 * Applications use accept() call to remove an established SCTP
4190 * association from the accept queue of the endpoint. A new socket
4191 * descriptor will be returned from accept() to represent the newly
4192 * formed association.
4194 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4196 struct sctp_sock *sp;
4197 struct sctp_endpoint *ep;
4198 struct sock *newsk = NULL;
4199 struct sctp_association *asoc;
4208 if (!sctp_style(sk, TCP)) {
4209 error = -EOPNOTSUPP;
4213 if (!sctp_sstate(sk, LISTENING)) {
4218 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4220 error = sctp_wait_for_accept(sk, timeo);
4224 /* We treat the list of associations on the endpoint as the accept
4225 * queue and pick the first association on the list.
4227 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4229 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4235 /* Populate the fields of the newsk from the oldsk and migrate the
4236 * asoc to the newsk.
4238 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4246 /* The SCTP ioctl handler. */
4247 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4254 * SEQPACKET-style sockets in LISTENING state are valid, for
4255 * SCTP, so only discard TCP-style sockets in LISTENING state.
4257 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4262 struct sk_buff *skb;
4263 unsigned int amount = 0;
4265 skb = skb_peek(&sk->sk_receive_queue);
4268 * We will only return the amount of this packet since
4269 * that is all that will be read.
4273 rc = put_user(amount, (int __user *)arg);
4285 /* This is the function which gets called during socket creation to
4286 * initialized the SCTP-specific portion of the sock.
4287 * The sock structure should already be zero-filled memory.
4289 static int sctp_init_sock(struct sock *sk)
4291 struct net *net = sock_net(sk);
4292 struct sctp_sock *sp;
4294 pr_debug("%s: sk:%p\n", __func__, sk);
4298 /* Initialize the SCTP per socket area. */
4299 switch (sk->sk_type) {
4300 case SOCK_SEQPACKET:
4301 sp->type = SCTP_SOCKET_UDP;
4304 sp->type = SCTP_SOCKET_TCP;
4307 return -ESOCKTNOSUPPORT;
4310 sk->sk_gso_type = SKB_GSO_SCTP;
4312 /* Initialize default send parameters. These parameters can be
4313 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4315 sp->default_stream = 0;
4316 sp->default_ppid = 0;
4317 sp->default_flags = 0;
4318 sp->default_context = 0;
4319 sp->default_timetolive = 0;
4321 sp->default_rcv_context = 0;
4322 sp->max_burst = net->sctp.max_burst;
4324 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4326 /* Initialize default setup parameters. These parameters
4327 * can be modified with the SCTP_INITMSG socket option or
4328 * overridden by the SCTP_INIT CMSG.
4330 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4331 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4332 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4333 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4335 /* Initialize default RTO related parameters. These parameters can
4336 * be modified for with the SCTP_RTOINFO socket option.
4338 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4339 sp->rtoinfo.srto_max = net->sctp.rto_max;
4340 sp->rtoinfo.srto_min = net->sctp.rto_min;
4342 /* Initialize default association related parameters. These parameters
4343 * can be modified with the SCTP_ASSOCINFO socket option.
4345 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4346 sp->assocparams.sasoc_number_peer_destinations = 0;
4347 sp->assocparams.sasoc_peer_rwnd = 0;
4348 sp->assocparams.sasoc_local_rwnd = 0;
4349 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4351 /* Initialize default event subscriptions. By default, all the
4354 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4356 /* Default Peer Address Parameters. These defaults can
4357 * be modified via SCTP_PEER_ADDR_PARAMS
4359 sp->hbinterval = net->sctp.hb_interval;
4360 sp->pathmaxrxt = net->sctp.max_retrans_path;
4361 sp->pathmtu = 0; /* allow default discovery */
4362 sp->sackdelay = net->sctp.sack_timeout;
4364 sp->param_flags = SPP_HB_ENABLE |
4366 SPP_SACKDELAY_ENABLE;
4368 /* If enabled no SCTP message fragmentation will be performed.
4369 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4371 sp->disable_fragments = 0;
4373 /* Enable Nagle algorithm by default. */
4376 sp->recvrcvinfo = 0;
4377 sp->recvnxtinfo = 0;
4379 /* Enable by default. */
4382 /* Auto-close idle associations after the configured
4383 * number of seconds. A value of 0 disables this
4384 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4385 * for UDP-style sockets only.
4389 /* User specified fragmentation limit. */
4392 sp->adaptation_ind = 0;
4394 sp->pf = sctp_get_pf_specific(sk->sk_family);
4396 /* Control variables for partial data delivery. */
4397 atomic_set(&sp->pd_mode, 0);
4398 skb_queue_head_init(&sp->pd_lobby);
4399 sp->frag_interleave = 0;
4401 /* Create a per socket endpoint structure. Even if we
4402 * change the data structure relationships, this may still
4403 * be useful for storing pre-connect address information.
4405 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4411 sk->sk_destruct = sctp_destruct_sock;
4413 SCTP_DBG_OBJCNT_INC(sock);
4416 sk_sockets_allocated_inc(sk);
4417 sock_prot_inuse_add(net, sk->sk_prot, 1);
4419 /* Nothing can fail after this block, otherwise
4420 * sctp_destroy_sock() will be called without addr_wq_lock held
4422 if (net->sctp.default_auto_asconf) {
4423 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4424 list_add_tail(&sp->auto_asconf_list,
4425 &net->sctp.auto_asconf_splist);
4426 sp->do_auto_asconf = 1;
4427 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4429 sp->do_auto_asconf = 0;
4437 /* Cleanup any SCTP per socket resources. Must be called with
4438 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4440 static void sctp_destroy_sock(struct sock *sk)
4442 struct sctp_sock *sp;
4444 pr_debug("%s: sk:%p\n", __func__, sk);
4446 /* Release our hold on the endpoint. */
4448 /* This could happen during socket init, thus we bail out
4449 * early, since the rest of the below is not setup either.
4454 if (sp->do_auto_asconf) {
4455 sp->do_auto_asconf = 0;
4456 list_del(&sp->auto_asconf_list);
4458 sctp_endpoint_free(sp->ep);
4460 sk_sockets_allocated_dec(sk);
4461 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4465 /* Triggered when there are no references on the socket anymore */
4466 static void sctp_destruct_sock(struct sock *sk)
4468 struct sctp_sock *sp = sctp_sk(sk);
4470 /* Free up the HMAC transform. */
4471 crypto_free_shash(sp->hmac);
4473 inet_sock_destruct(sk);
4476 /* API 4.1.7 shutdown() - TCP Style Syntax
4477 * int shutdown(int socket, int how);
4479 * sd - the socket descriptor of the association to be closed.
4480 * how - Specifies the type of shutdown. The values are
4483 * Disables further receive operations. No SCTP
4484 * protocol action is taken.
4486 * Disables further send operations, and initiates
4487 * the SCTP shutdown sequence.
4489 * Disables further send and receive operations
4490 * and initiates the SCTP shutdown sequence.
4492 static void sctp_shutdown(struct sock *sk, int how)
4494 struct net *net = sock_net(sk);
4495 struct sctp_endpoint *ep;
4497 if (!sctp_style(sk, TCP))
4500 ep = sctp_sk(sk)->ep;
4501 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4502 struct sctp_association *asoc;
4504 sk->sk_state = SCTP_SS_CLOSING;
4505 asoc = list_entry(ep->asocs.next,
4506 struct sctp_association, asocs);
4507 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4511 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4512 struct sctp_info *info)
4514 struct sctp_transport *prim;
4515 struct list_head *pos;
4518 memset(info, 0, sizeof(*info));
4520 struct sctp_sock *sp = sctp_sk(sk);
4522 info->sctpi_s_autoclose = sp->autoclose;
4523 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4524 info->sctpi_s_pd_point = sp->pd_point;
4525 info->sctpi_s_nodelay = sp->nodelay;
4526 info->sctpi_s_disable_fragments = sp->disable_fragments;
4527 info->sctpi_s_v4mapped = sp->v4mapped;
4528 info->sctpi_s_frag_interleave = sp->frag_interleave;
4529 info->sctpi_s_type = sp->type;
4534 info->sctpi_tag = asoc->c.my_vtag;
4535 info->sctpi_state = asoc->state;
4536 info->sctpi_rwnd = asoc->a_rwnd;
4537 info->sctpi_unackdata = asoc->unack_data;
4538 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4539 info->sctpi_instrms = asoc->stream.incnt;
4540 info->sctpi_outstrms = asoc->stream.outcnt;
4541 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4542 info->sctpi_inqueue++;
4543 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4544 info->sctpi_outqueue++;
4545 info->sctpi_overall_error = asoc->overall_error_count;
4546 info->sctpi_max_burst = asoc->max_burst;
4547 info->sctpi_maxseg = asoc->frag_point;
4548 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4549 info->sctpi_peer_tag = asoc->c.peer_vtag;
4551 mask = asoc->peer.ecn_capable << 1;
4552 mask = (mask | asoc->peer.ipv4_address) << 1;
4553 mask = (mask | asoc->peer.ipv6_address) << 1;
4554 mask = (mask | asoc->peer.hostname_address) << 1;
4555 mask = (mask | asoc->peer.asconf_capable) << 1;
4556 mask = (mask | asoc->peer.prsctp_capable) << 1;
4557 mask = (mask | asoc->peer.auth_capable);
4558 info->sctpi_peer_capable = mask;
4559 mask = asoc->peer.sack_needed << 1;
4560 mask = (mask | asoc->peer.sack_generation) << 1;
4561 mask = (mask | asoc->peer.zero_window_announced);
4562 info->sctpi_peer_sack = mask;
4564 info->sctpi_isacks = asoc->stats.isacks;
4565 info->sctpi_osacks = asoc->stats.osacks;
4566 info->sctpi_opackets = asoc->stats.opackets;
4567 info->sctpi_ipackets = asoc->stats.ipackets;
4568 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4569 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4570 info->sctpi_idupchunks = asoc->stats.idupchunks;
4571 info->sctpi_gapcnt = asoc->stats.gapcnt;
4572 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4573 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4574 info->sctpi_oodchunks = asoc->stats.oodchunks;
4575 info->sctpi_iodchunks = asoc->stats.iodchunks;
4576 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4577 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4579 prim = asoc->peer.primary_path;
4580 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4581 info->sctpi_p_state = prim->state;
4582 info->sctpi_p_cwnd = prim->cwnd;
4583 info->sctpi_p_srtt = prim->srtt;
4584 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4585 info->sctpi_p_hbinterval = prim->hbinterval;
4586 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4587 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4588 info->sctpi_p_ssthresh = prim->ssthresh;
4589 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4590 info->sctpi_p_flight_size = prim->flight_size;
4591 info->sctpi_p_error = prim->error_count;
4595 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4597 /* use callback to avoid exporting the core structure */
4598 int sctp_transport_walk_start(struct rhashtable_iter *iter)
4602 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4604 err = rhashtable_walk_start(iter);
4605 if (err && err != -EAGAIN) {
4606 rhashtable_walk_stop(iter);
4607 rhashtable_walk_exit(iter);
4614 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4616 rhashtable_walk_stop(iter);
4617 rhashtable_walk_exit(iter);
4620 struct sctp_transport *sctp_transport_get_next(struct net *net,
4621 struct rhashtable_iter *iter)
4623 struct sctp_transport *t;
4625 t = rhashtable_walk_next(iter);
4626 for (; t; t = rhashtable_walk_next(iter)) {
4628 if (PTR_ERR(t) == -EAGAIN)
4633 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4634 t->asoc->peer.primary_path == t)
4641 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4642 struct rhashtable_iter *iter,
4645 void *obj = SEQ_START_TOKEN;
4647 while (pos && (obj = sctp_transport_get_next(net, iter)) &&
4654 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4658 struct sctp_ep_common *epb;
4659 struct sctp_hashbucket *head;
4661 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4663 read_lock_bh(&head->lock);
4664 sctp_for_each_hentry(epb, &head->chain) {
4665 err = cb(sctp_ep(epb), p);
4669 read_unlock_bh(&head->lock);
4674 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4676 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4678 const union sctp_addr *laddr,
4679 const union sctp_addr *paddr, void *p)
4681 struct sctp_transport *transport;
4685 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4690 err = cb(transport, p);
4691 sctp_transport_put(transport);
4695 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4697 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4698 int (*cb_done)(struct sctp_transport *, void *),
4699 struct net *net, int *pos, void *p) {
4700 struct rhashtable_iter hti;
4701 struct sctp_transport *tsp;
4705 ret = sctp_transport_walk_start(&hti);
4709 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
4710 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
4711 if (!sctp_transport_hold(tsp))
4717 sctp_transport_put(tsp);
4719 sctp_transport_walk_stop(&hti);
4722 if (cb_done && !cb_done(tsp, p)) {
4724 sctp_transport_put(tsp);
4727 sctp_transport_put(tsp);
4732 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
4734 /* 7.2.1 Association Status (SCTP_STATUS)
4736 * Applications can retrieve current status information about an
4737 * association, including association state, peer receiver window size,
4738 * number of unacked data chunks, and number of data chunks pending
4739 * receipt. This information is read-only.
4741 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4742 char __user *optval,
4745 struct sctp_status status;
4746 struct sctp_association *asoc = NULL;
4747 struct sctp_transport *transport;
4748 sctp_assoc_t associd;
4751 if (len < sizeof(status)) {
4756 len = sizeof(status);
4757 if (copy_from_user(&status, optval, len)) {
4762 associd = status.sstat_assoc_id;
4763 asoc = sctp_id2assoc(sk, associd);
4769 transport = asoc->peer.primary_path;
4771 status.sstat_assoc_id = sctp_assoc2id(asoc);
4772 status.sstat_state = sctp_assoc_to_state(asoc);
4773 status.sstat_rwnd = asoc->peer.rwnd;
4774 status.sstat_unackdata = asoc->unack_data;
4776 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4777 status.sstat_instrms = asoc->stream.incnt;
4778 status.sstat_outstrms = asoc->stream.outcnt;
4779 status.sstat_fragmentation_point = asoc->frag_point;
4780 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4781 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4782 transport->af_specific->sockaddr_len);
4783 /* Map ipv4 address into v4-mapped-on-v6 address. */
4784 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4785 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4786 status.sstat_primary.spinfo_state = transport->state;
4787 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4788 status.sstat_primary.spinfo_srtt = transport->srtt;
4789 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4790 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4792 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4793 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4795 if (put_user(len, optlen)) {
4800 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4801 __func__, len, status.sstat_state, status.sstat_rwnd,
4802 status.sstat_assoc_id);
4804 if (copy_to_user(optval, &status, len)) {
4814 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4816 * Applications can retrieve information about a specific peer address
4817 * of an association, including its reachability state, congestion
4818 * window, and retransmission timer values. This information is
4821 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4822 char __user *optval,
4825 struct sctp_paddrinfo pinfo;
4826 struct sctp_transport *transport;
4829 if (len < sizeof(pinfo)) {
4834 len = sizeof(pinfo);
4835 if (copy_from_user(&pinfo, optval, len)) {
4840 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4841 pinfo.spinfo_assoc_id);
4845 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4846 pinfo.spinfo_state = transport->state;
4847 pinfo.spinfo_cwnd = transport->cwnd;
4848 pinfo.spinfo_srtt = transport->srtt;
4849 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4850 pinfo.spinfo_mtu = transport->pathmtu;
4852 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4853 pinfo.spinfo_state = SCTP_ACTIVE;
4855 if (put_user(len, optlen)) {
4860 if (copy_to_user(optval, &pinfo, len)) {
4869 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4871 * This option is a on/off flag. If enabled no SCTP message
4872 * fragmentation will be performed. Instead if a message being sent
4873 * exceeds the current PMTU size, the message will NOT be sent and
4874 * instead a error will be indicated to the user.
4876 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4877 char __user *optval, int __user *optlen)
4881 if (len < sizeof(int))
4885 val = (sctp_sk(sk)->disable_fragments == 1);
4886 if (put_user(len, optlen))
4888 if (copy_to_user(optval, &val, len))
4893 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4895 * This socket option is used to specify various notifications and
4896 * ancillary data the user wishes to receive.
4898 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4903 if (len > sizeof(struct sctp_event_subscribe))
4904 len = sizeof(struct sctp_event_subscribe);
4905 if (put_user(len, optlen))
4907 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4912 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4914 * This socket option is applicable to the UDP-style socket only. When
4915 * set it will cause associations that are idle for more than the
4916 * specified number of seconds to automatically close. An association
4917 * being idle is defined an association that has NOT sent or received
4918 * user data. The special value of '0' indicates that no automatic
4919 * close of any associations should be performed. The option expects an
4920 * integer defining the number of seconds of idle time before an
4921 * association is closed.
4923 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4925 /* Applicable to UDP-style socket only */
4926 if (sctp_style(sk, TCP))
4928 if (len < sizeof(int))
4931 if (put_user(len, optlen))
4933 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4938 /* Helper routine to branch off an association to a new socket. */
4939 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4941 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4942 struct sctp_sock *sp = sctp_sk(sk);
4943 struct socket *sock;
4946 /* Do not peel off from one netns to another one. */
4947 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
4953 /* An association cannot be branched off from an already peeled-off
4954 * socket, nor is this supported for tcp style sockets.
4956 if (!sctp_style(sk, UDP))
4959 /* Create a new socket. */
4960 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4964 sctp_copy_sock(sock->sk, sk, asoc);
4966 /* Make peeled-off sockets more like 1-1 accepted sockets.
4967 * Set the daddr and initialize id to something more random
4969 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4971 /* Populate the fields of the newsk from the oldsk and migrate the
4972 * asoc to the newsk.
4974 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4980 EXPORT_SYMBOL(sctp_do_peeloff);
4982 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
4983 struct file **newfile, unsigned flags)
4985 struct socket *newsock;
4988 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
4992 /* Map the socket to an unused fd that can be returned to the user. */
4993 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
4995 sock_release(newsock);
4999 *newfile = sock_alloc_file(newsock, 0, NULL);
5000 if (IS_ERR(*newfile)) {
5001 put_unused_fd(retval);
5002 sock_release(newsock);
5003 retval = PTR_ERR(*newfile);
5008 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5011 peeloff->sd = retval;
5013 if (flags & SOCK_NONBLOCK)
5014 (*newfile)->f_flags |= O_NONBLOCK;
5019 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5021 sctp_peeloff_arg_t peeloff;
5022 struct file *newfile = NULL;
5025 if (len < sizeof(sctp_peeloff_arg_t))
5027 len = sizeof(sctp_peeloff_arg_t);
5028 if (copy_from_user(&peeloff, optval, len))
5031 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5035 /* Return the fd mapped to the new socket. */
5036 if (put_user(len, optlen)) {
5038 put_unused_fd(retval);
5042 if (copy_to_user(optval, &peeloff, len)) {
5044 put_unused_fd(retval);
5047 fd_install(retval, newfile);
5052 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5053 char __user *optval, int __user *optlen)
5055 sctp_peeloff_flags_arg_t peeloff;
5056 struct file *newfile = NULL;
5059 if (len < sizeof(sctp_peeloff_flags_arg_t))
5061 len = sizeof(sctp_peeloff_flags_arg_t);
5062 if (copy_from_user(&peeloff, optval, len))
5065 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5066 &newfile, peeloff.flags);
5070 /* Return the fd mapped to the new socket. */
5071 if (put_user(len, optlen)) {
5073 put_unused_fd(retval);
5077 if (copy_to_user(optval, &peeloff, len)) {
5079 put_unused_fd(retval);
5082 fd_install(retval, newfile);
5087 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5089 * Applications can enable or disable heartbeats for any peer address of
5090 * an association, modify an address's heartbeat interval, force a
5091 * heartbeat to be sent immediately, and adjust the address's maximum
5092 * number of retransmissions sent before an address is considered
5093 * unreachable. The following structure is used to access and modify an
5094 * address's parameters:
5096 * struct sctp_paddrparams {
5097 * sctp_assoc_t spp_assoc_id;
5098 * struct sockaddr_storage spp_address;
5099 * uint32_t spp_hbinterval;
5100 * uint16_t spp_pathmaxrxt;
5101 * uint32_t spp_pathmtu;
5102 * uint32_t spp_sackdelay;
5103 * uint32_t spp_flags;
5106 * spp_assoc_id - (one-to-many style socket) This is filled in the
5107 * application, and identifies the association for
5109 * spp_address - This specifies which address is of interest.
5110 * spp_hbinterval - This contains the value of the heartbeat interval,
5111 * in milliseconds. If a value of zero
5112 * is present in this field then no changes are to
5113 * be made to this parameter.
5114 * spp_pathmaxrxt - This contains the maximum number of
5115 * retransmissions before this address shall be
5116 * considered unreachable. If a value of zero
5117 * is present in this field then no changes are to
5118 * be made to this parameter.
5119 * spp_pathmtu - When Path MTU discovery is disabled the value
5120 * specified here will be the "fixed" path mtu.
5121 * Note that if the spp_address field is empty
5122 * then all associations on this address will
5123 * have this fixed path mtu set upon them.
5125 * spp_sackdelay - When delayed sack is enabled, this value specifies
5126 * the number of milliseconds that sacks will be delayed
5127 * for. This value will apply to all addresses of an
5128 * association if the spp_address field is empty. Note
5129 * also, that if delayed sack is enabled and this
5130 * value is set to 0, no change is made to the last
5131 * recorded delayed sack timer value.
5133 * spp_flags - These flags are used to control various features
5134 * on an association. The flag field may contain
5135 * zero or more of the following options.
5137 * SPP_HB_ENABLE - Enable heartbeats on the
5138 * specified address. Note that if the address
5139 * field is empty all addresses for the association
5140 * have heartbeats enabled upon them.
5142 * SPP_HB_DISABLE - Disable heartbeats on the
5143 * speicifed address. Note that if the address
5144 * field is empty all addresses for the association
5145 * will have their heartbeats disabled. Note also
5146 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5147 * mutually exclusive, only one of these two should
5148 * be specified. Enabling both fields will have
5149 * undetermined results.
5151 * SPP_HB_DEMAND - Request a user initiated heartbeat
5152 * to be made immediately.
5154 * SPP_PMTUD_ENABLE - This field will enable PMTU
5155 * discovery upon the specified address. Note that
5156 * if the address feild is empty then all addresses
5157 * on the association are effected.
5159 * SPP_PMTUD_DISABLE - This field will disable PMTU
5160 * discovery upon the specified address. Note that
5161 * if the address feild is empty then all addresses
5162 * on the association are effected. Not also that
5163 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5164 * exclusive. Enabling both will have undetermined
5167 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5168 * on delayed sack. The time specified in spp_sackdelay
5169 * is used to specify the sack delay for this address. Note
5170 * that if spp_address is empty then all addresses will
5171 * enable delayed sack and take on the sack delay
5172 * value specified in spp_sackdelay.
5173 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5174 * off delayed sack. If the spp_address field is blank then
5175 * delayed sack is disabled for the entire association. Note
5176 * also that this field is mutually exclusive to
5177 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5180 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5181 char __user *optval, int __user *optlen)
5183 struct sctp_paddrparams params;
5184 struct sctp_transport *trans = NULL;
5185 struct sctp_association *asoc = NULL;
5186 struct sctp_sock *sp = sctp_sk(sk);
5188 if (len < sizeof(struct sctp_paddrparams))
5190 len = sizeof(struct sctp_paddrparams);
5191 if (copy_from_user(¶ms, optval, len))
5194 /* If an address other than INADDR_ANY is specified, and
5195 * no transport is found, then the request is invalid.
5197 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5198 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5199 params.spp_assoc_id);
5201 pr_debug("%s: failed no transport\n", __func__);
5206 /* Get association, if assoc_id != 0 and the socket is a one
5207 * to many style socket, and an association was not found, then
5208 * the id was invalid.
5210 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5211 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5212 pr_debug("%s: failed no association\n", __func__);
5217 /* Fetch transport values. */
5218 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5219 params.spp_pathmtu = trans->pathmtu;
5220 params.spp_pathmaxrxt = trans->pathmaxrxt;
5221 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5223 /*draft-11 doesn't say what to return in spp_flags*/
5224 params.spp_flags = trans->param_flags;
5226 /* Fetch association values. */
5227 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5228 params.spp_pathmtu = asoc->pathmtu;
5229 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5230 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5232 /*draft-11 doesn't say what to return in spp_flags*/
5233 params.spp_flags = asoc->param_flags;
5235 /* Fetch socket values. */
5236 params.spp_hbinterval = sp->hbinterval;
5237 params.spp_pathmtu = sp->pathmtu;
5238 params.spp_sackdelay = sp->sackdelay;
5239 params.spp_pathmaxrxt = sp->pathmaxrxt;
5241 /*draft-11 doesn't say what to return in spp_flags*/
5242 params.spp_flags = sp->param_flags;
5245 if (copy_to_user(optval, ¶ms, len))
5248 if (put_user(len, optlen))
5255 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5257 * This option will effect the way delayed acks are performed. This
5258 * option allows you to get or set the delayed ack time, in
5259 * milliseconds. It also allows changing the delayed ack frequency.
5260 * Changing the frequency to 1 disables the delayed sack algorithm. If
5261 * the assoc_id is 0, then this sets or gets the endpoints default
5262 * values. If the assoc_id field is non-zero, then the set or get
5263 * effects the specified association for the one to many model (the
5264 * assoc_id field is ignored by the one to one model). Note that if
5265 * sack_delay or sack_freq are 0 when setting this option, then the
5266 * current values will remain unchanged.
5268 * struct sctp_sack_info {
5269 * sctp_assoc_t sack_assoc_id;
5270 * uint32_t sack_delay;
5271 * uint32_t sack_freq;
5274 * sack_assoc_id - This parameter, indicates which association the user
5275 * is performing an action upon. Note that if this field's value is
5276 * zero then the endpoints default value is changed (effecting future
5277 * associations only).
5279 * sack_delay - This parameter contains the number of milliseconds that
5280 * the user is requesting the delayed ACK timer be set to. Note that
5281 * this value is defined in the standard to be between 200 and 500
5284 * sack_freq - This parameter contains the number of packets that must
5285 * be received before a sack is sent without waiting for the delay
5286 * timer to expire. The default value for this is 2, setting this
5287 * value to 1 will disable the delayed sack algorithm.
5289 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5290 char __user *optval,
5293 struct sctp_sack_info params;
5294 struct sctp_association *asoc = NULL;
5295 struct sctp_sock *sp = sctp_sk(sk);
5297 if (len >= sizeof(struct sctp_sack_info)) {
5298 len = sizeof(struct sctp_sack_info);
5300 if (copy_from_user(¶ms, optval, len))
5302 } else if (len == sizeof(struct sctp_assoc_value)) {
5303 pr_warn_ratelimited(DEPRECATED
5305 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5306 "Use struct sctp_sack_info instead\n",
5307 current->comm, task_pid_nr(current));
5308 if (copy_from_user(¶ms, optval, len))
5313 /* Get association, if sack_assoc_id != 0 and the socket is a one
5314 * to many style socket, and an association was not found, then
5315 * the id was invalid.
5317 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5318 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5322 /* Fetch association values. */
5323 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5324 params.sack_delay = jiffies_to_msecs(
5326 params.sack_freq = asoc->sackfreq;
5329 params.sack_delay = 0;
5330 params.sack_freq = 1;
5333 /* Fetch socket values. */
5334 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5335 params.sack_delay = sp->sackdelay;
5336 params.sack_freq = sp->sackfreq;
5338 params.sack_delay = 0;
5339 params.sack_freq = 1;
5343 if (copy_to_user(optval, ¶ms, len))
5346 if (put_user(len, optlen))
5352 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5354 * Applications can specify protocol parameters for the default association
5355 * initialization. The option name argument to setsockopt() and getsockopt()
5358 * Setting initialization parameters is effective only on an unconnected
5359 * socket (for UDP-style sockets only future associations are effected
5360 * by the change). With TCP-style sockets, this option is inherited by
5361 * sockets derived from a listener socket.
5363 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5365 if (len < sizeof(struct sctp_initmsg))
5367 len = sizeof(struct sctp_initmsg);
5368 if (put_user(len, optlen))
5370 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5376 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5377 char __user *optval, int __user *optlen)
5379 struct sctp_association *asoc;
5381 struct sctp_getaddrs getaddrs;
5382 struct sctp_transport *from;
5384 union sctp_addr temp;
5385 struct sctp_sock *sp = sctp_sk(sk);
5390 if (len < sizeof(struct sctp_getaddrs))
5393 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5396 /* For UDP-style sockets, id specifies the association to query. */
5397 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5401 to = optval + offsetof(struct sctp_getaddrs, addrs);
5402 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5404 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5406 memcpy(&temp, &from->ipaddr, sizeof(temp));
5407 addrlen = sctp_get_pf_specific(sk->sk_family)
5408 ->addr_to_user(sp, &temp);
5409 if (space_left < addrlen)
5411 if (copy_to_user(to, &temp, addrlen))
5415 space_left -= addrlen;
5418 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5420 bytes_copied = ((char __user *)to) - optval;
5421 if (put_user(bytes_copied, optlen))
5427 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5428 size_t space_left, int *bytes_copied)
5430 struct sctp_sockaddr_entry *addr;
5431 union sctp_addr temp;
5434 struct net *net = sock_net(sk);
5437 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5441 if ((PF_INET == sk->sk_family) &&
5442 (AF_INET6 == addr->a.sa.sa_family))
5444 if ((PF_INET6 == sk->sk_family) &&
5445 inet_v6_ipv6only(sk) &&
5446 (AF_INET == addr->a.sa.sa_family))
5448 memcpy(&temp, &addr->a, sizeof(temp));
5449 if (!temp.v4.sin_port)
5450 temp.v4.sin_port = htons(port);
5452 addrlen = sctp_get_pf_specific(sk->sk_family)
5453 ->addr_to_user(sctp_sk(sk), &temp);
5455 if (space_left < addrlen) {
5459 memcpy(to, &temp, addrlen);
5463 space_left -= addrlen;
5464 *bytes_copied += addrlen;
5472 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5473 char __user *optval, int __user *optlen)
5475 struct sctp_bind_addr *bp;
5476 struct sctp_association *asoc;
5478 struct sctp_getaddrs getaddrs;
5479 struct sctp_sockaddr_entry *addr;
5481 union sctp_addr temp;
5482 struct sctp_sock *sp = sctp_sk(sk);
5486 int bytes_copied = 0;
5490 if (len < sizeof(struct sctp_getaddrs))
5493 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5497 * For UDP-style sockets, id specifies the association to query.
5498 * If the id field is set to the value '0' then the locally bound
5499 * addresses are returned without regard to any particular
5502 if (0 == getaddrs.assoc_id) {
5503 bp = &sctp_sk(sk)->ep->base.bind_addr;
5505 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5508 bp = &asoc->base.bind_addr;
5511 to = optval + offsetof(struct sctp_getaddrs, addrs);
5512 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5514 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5518 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5519 * addresses from the global local address list.
5521 if (sctp_list_single_entry(&bp->address_list)) {
5522 addr = list_entry(bp->address_list.next,
5523 struct sctp_sockaddr_entry, list);
5524 if (sctp_is_any(sk, &addr->a)) {
5525 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5526 space_left, &bytes_copied);
5536 /* Protection on the bound address list is not needed since
5537 * in the socket option context we hold a socket lock and
5538 * thus the bound address list can't change.
5540 list_for_each_entry(addr, &bp->address_list, list) {
5541 memcpy(&temp, &addr->a, sizeof(temp));
5542 addrlen = sctp_get_pf_specific(sk->sk_family)
5543 ->addr_to_user(sp, &temp);
5544 if (space_left < addrlen) {
5545 err = -ENOMEM; /*fixme: right error?*/
5548 memcpy(buf, &temp, addrlen);
5550 bytes_copied += addrlen;
5552 space_left -= addrlen;
5556 if (copy_to_user(to, addrs, bytes_copied)) {
5560 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5564 if (put_user(bytes_copied, optlen))
5571 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5573 * Requests that the local SCTP stack use the enclosed peer address as
5574 * the association primary. The enclosed address must be one of the
5575 * association peer's addresses.
5577 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5578 char __user *optval, int __user *optlen)
5580 struct sctp_prim prim;
5581 struct sctp_association *asoc;
5582 struct sctp_sock *sp = sctp_sk(sk);
5584 if (len < sizeof(struct sctp_prim))
5587 len = sizeof(struct sctp_prim);
5589 if (copy_from_user(&prim, optval, len))
5592 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5596 if (!asoc->peer.primary_path)
5599 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5600 asoc->peer.primary_path->af_specific->sockaddr_len);
5602 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5603 (union sctp_addr *)&prim.ssp_addr);
5605 if (put_user(len, optlen))
5607 if (copy_to_user(optval, &prim, len))
5614 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5616 * Requests that the local endpoint set the specified Adaptation Layer
5617 * Indication parameter for all future INIT and INIT-ACK exchanges.
5619 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5620 char __user *optval, int __user *optlen)
5622 struct sctp_setadaptation adaptation;
5624 if (len < sizeof(struct sctp_setadaptation))
5627 len = sizeof(struct sctp_setadaptation);
5629 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5631 if (put_user(len, optlen))
5633 if (copy_to_user(optval, &adaptation, len))
5641 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5643 * Applications that wish to use the sendto() system call may wish to
5644 * specify a default set of parameters that would normally be supplied
5645 * through the inclusion of ancillary data. This socket option allows
5646 * such an application to set the default sctp_sndrcvinfo structure.
5649 * The application that wishes to use this socket option simply passes
5650 * in to this call the sctp_sndrcvinfo structure defined in Section
5651 * 5.2.2) The input parameters accepted by this call include
5652 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5653 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5654 * to this call if the caller is using the UDP model.
5656 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5658 static int sctp_getsockopt_default_send_param(struct sock *sk,
5659 int len, char __user *optval,
5662 struct sctp_sock *sp = sctp_sk(sk);
5663 struct sctp_association *asoc;
5664 struct sctp_sndrcvinfo info;
5666 if (len < sizeof(info))
5671 if (copy_from_user(&info, optval, len))
5674 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5675 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5678 info.sinfo_stream = asoc->default_stream;
5679 info.sinfo_flags = asoc->default_flags;
5680 info.sinfo_ppid = asoc->default_ppid;
5681 info.sinfo_context = asoc->default_context;
5682 info.sinfo_timetolive = asoc->default_timetolive;
5684 info.sinfo_stream = sp->default_stream;
5685 info.sinfo_flags = sp->default_flags;
5686 info.sinfo_ppid = sp->default_ppid;
5687 info.sinfo_context = sp->default_context;
5688 info.sinfo_timetolive = sp->default_timetolive;
5691 if (put_user(len, optlen))
5693 if (copy_to_user(optval, &info, len))
5699 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5700 * (SCTP_DEFAULT_SNDINFO)
5702 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5703 char __user *optval,
5706 struct sctp_sock *sp = sctp_sk(sk);
5707 struct sctp_association *asoc;
5708 struct sctp_sndinfo info;
5710 if (len < sizeof(info))
5715 if (copy_from_user(&info, optval, len))
5718 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5719 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5722 info.snd_sid = asoc->default_stream;
5723 info.snd_flags = asoc->default_flags;
5724 info.snd_ppid = asoc->default_ppid;
5725 info.snd_context = asoc->default_context;
5727 info.snd_sid = sp->default_stream;
5728 info.snd_flags = sp->default_flags;
5729 info.snd_ppid = sp->default_ppid;
5730 info.snd_context = sp->default_context;
5733 if (put_user(len, optlen))
5735 if (copy_to_user(optval, &info, len))
5743 * 7.1.5 SCTP_NODELAY
5745 * Turn on/off any Nagle-like algorithm. This means that packets are
5746 * generally sent as soon as possible and no unnecessary delays are
5747 * introduced, at the cost of more packets in the network. Expects an
5748 * integer boolean flag.
5751 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5752 char __user *optval, int __user *optlen)
5756 if (len < sizeof(int))
5760 val = (sctp_sk(sk)->nodelay == 1);
5761 if (put_user(len, optlen))
5763 if (copy_to_user(optval, &val, len))
5770 * 7.1.1 SCTP_RTOINFO
5772 * The protocol parameters used to initialize and bound retransmission
5773 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5774 * and modify these parameters.
5775 * All parameters are time values, in milliseconds. A value of 0, when
5776 * modifying the parameters, indicates that the current value should not
5780 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5781 char __user *optval,
5782 int __user *optlen) {
5783 struct sctp_rtoinfo rtoinfo;
5784 struct sctp_association *asoc;
5786 if (len < sizeof (struct sctp_rtoinfo))
5789 len = sizeof(struct sctp_rtoinfo);
5791 if (copy_from_user(&rtoinfo, optval, len))
5794 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5796 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5799 /* Values corresponding to the specific association. */
5801 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5802 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5803 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5805 /* Values corresponding to the endpoint. */
5806 struct sctp_sock *sp = sctp_sk(sk);
5808 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5809 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5810 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5813 if (put_user(len, optlen))
5816 if (copy_to_user(optval, &rtoinfo, len))
5824 * 7.1.2 SCTP_ASSOCINFO
5826 * This option is used to tune the maximum retransmission attempts
5827 * of the association.
5828 * Returns an error if the new association retransmission value is
5829 * greater than the sum of the retransmission value of the peer.
5830 * See [SCTP] for more information.
5833 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5834 char __user *optval,
5838 struct sctp_assocparams assocparams;
5839 struct sctp_association *asoc;
5840 struct list_head *pos;
5843 if (len < sizeof (struct sctp_assocparams))
5846 len = sizeof(struct sctp_assocparams);
5848 if (copy_from_user(&assocparams, optval, len))
5851 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5853 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5856 /* Values correspoinding to the specific association */
5858 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5859 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5860 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5861 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5863 list_for_each(pos, &asoc->peer.transport_addr_list) {
5867 assocparams.sasoc_number_peer_destinations = cnt;
5869 /* Values corresponding to the endpoint */
5870 struct sctp_sock *sp = sctp_sk(sk);
5872 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5873 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5874 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5875 assocparams.sasoc_cookie_life =
5876 sp->assocparams.sasoc_cookie_life;
5877 assocparams.sasoc_number_peer_destinations =
5879 sasoc_number_peer_destinations;
5882 if (put_user(len, optlen))
5885 if (copy_to_user(optval, &assocparams, len))
5892 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5894 * This socket option is a boolean flag which turns on or off mapped V4
5895 * addresses. If this option is turned on and the socket is type
5896 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5897 * If this option is turned off, then no mapping will be done of V4
5898 * addresses and a user will receive both PF_INET6 and PF_INET type
5899 * addresses on the socket.
5901 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5902 char __user *optval, int __user *optlen)
5905 struct sctp_sock *sp = sctp_sk(sk);
5907 if (len < sizeof(int))
5912 if (put_user(len, optlen))
5914 if (copy_to_user(optval, &val, len))
5921 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5922 * (chapter and verse is quoted at sctp_setsockopt_context())
5924 static int sctp_getsockopt_context(struct sock *sk, int len,
5925 char __user *optval, int __user *optlen)
5927 struct sctp_assoc_value params;
5928 struct sctp_sock *sp;
5929 struct sctp_association *asoc;
5931 if (len < sizeof(struct sctp_assoc_value))
5934 len = sizeof(struct sctp_assoc_value);
5936 if (copy_from_user(¶ms, optval, len))
5941 if (params.assoc_id != 0) {
5942 asoc = sctp_id2assoc(sk, params.assoc_id);
5945 params.assoc_value = asoc->default_rcv_context;
5947 params.assoc_value = sp->default_rcv_context;
5950 if (put_user(len, optlen))
5952 if (copy_to_user(optval, ¶ms, len))
5959 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5960 * This option will get or set the maximum size to put in any outgoing
5961 * SCTP DATA chunk. If a message is larger than this size it will be
5962 * fragmented by SCTP into the specified size. Note that the underlying
5963 * SCTP implementation may fragment into smaller sized chunks when the
5964 * PMTU of the underlying association is smaller than the value set by
5965 * the user. The default value for this option is '0' which indicates
5966 * the user is NOT limiting fragmentation and only the PMTU will effect
5967 * SCTP's choice of DATA chunk size. Note also that values set larger
5968 * than the maximum size of an IP datagram will effectively let SCTP
5969 * control fragmentation (i.e. the same as setting this option to 0).
5971 * The following structure is used to access and modify this parameter:
5973 * struct sctp_assoc_value {
5974 * sctp_assoc_t assoc_id;
5975 * uint32_t assoc_value;
5978 * assoc_id: This parameter is ignored for one-to-one style sockets.
5979 * For one-to-many style sockets this parameter indicates which
5980 * association the user is performing an action upon. Note that if
5981 * this field's value is zero then the endpoints default value is
5982 * changed (effecting future associations only).
5983 * assoc_value: This parameter specifies the maximum size in bytes.
5985 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5986 char __user *optval, int __user *optlen)
5988 struct sctp_assoc_value params;
5989 struct sctp_association *asoc;
5991 if (len == sizeof(int)) {
5992 pr_warn_ratelimited(DEPRECATED
5994 "Use of int in maxseg socket option.\n"
5995 "Use struct sctp_assoc_value instead\n",
5996 current->comm, task_pid_nr(current));
5997 params.assoc_id = 0;
5998 } else if (len >= sizeof(struct sctp_assoc_value)) {
5999 len = sizeof(struct sctp_assoc_value);
6000 if (copy_from_user(¶ms, optval, sizeof(params)))
6005 asoc = sctp_id2assoc(sk, params.assoc_id);
6006 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6010 params.assoc_value = asoc->frag_point;
6012 params.assoc_value = sctp_sk(sk)->user_frag;
6014 if (put_user(len, optlen))
6016 if (len == sizeof(int)) {
6017 if (copy_to_user(optval, ¶ms.assoc_value, len))
6020 if (copy_to_user(optval, ¶ms, len))
6028 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6029 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6031 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6032 char __user *optval, int __user *optlen)
6036 if (len < sizeof(int))
6041 val = sctp_sk(sk)->frag_interleave;
6042 if (put_user(len, optlen))
6044 if (copy_to_user(optval, &val, len))
6051 * 7.1.25. Set or Get the sctp partial delivery point
6052 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6054 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6055 char __user *optval,
6060 if (len < sizeof(u32))
6065 val = sctp_sk(sk)->pd_point;
6066 if (put_user(len, optlen))
6068 if (copy_to_user(optval, &val, len))
6075 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6076 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6078 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6079 char __user *optval,
6082 struct sctp_assoc_value params;
6083 struct sctp_sock *sp;
6084 struct sctp_association *asoc;
6086 if (len == sizeof(int)) {
6087 pr_warn_ratelimited(DEPRECATED
6089 "Use of int in max_burst socket option.\n"
6090 "Use struct sctp_assoc_value instead\n",
6091 current->comm, task_pid_nr(current));
6092 params.assoc_id = 0;
6093 } else if (len >= sizeof(struct sctp_assoc_value)) {
6094 len = sizeof(struct sctp_assoc_value);
6095 if (copy_from_user(¶ms, optval, len))
6102 if (params.assoc_id != 0) {
6103 asoc = sctp_id2assoc(sk, params.assoc_id);
6106 params.assoc_value = asoc->max_burst;
6108 params.assoc_value = sp->max_burst;
6110 if (len == sizeof(int)) {
6111 if (copy_to_user(optval, ¶ms.assoc_value, len))
6114 if (copy_to_user(optval, ¶ms, len))
6122 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6123 char __user *optval, int __user *optlen)
6125 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6126 struct sctp_hmacalgo __user *p = (void __user *)optval;
6127 struct sctp_hmac_algo_param *hmacs;
6132 if (!ep->auth_enable)
6135 hmacs = ep->auth_hmacs_list;
6136 data_len = ntohs(hmacs->param_hdr.length) -
6137 sizeof(struct sctp_paramhdr);
6139 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6142 len = sizeof(struct sctp_hmacalgo) + data_len;
6143 num_idents = data_len / sizeof(u16);
6145 if (put_user(len, optlen))
6147 if (put_user(num_idents, &p->shmac_num_idents))
6149 for (i = 0; i < num_idents; i++) {
6150 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6152 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6158 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6159 char __user *optval, int __user *optlen)
6161 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6162 struct sctp_authkeyid val;
6163 struct sctp_association *asoc;
6165 if (!ep->auth_enable)
6168 if (len < sizeof(struct sctp_authkeyid))
6170 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
6173 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6174 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6178 val.scact_keynumber = asoc->active_key_id;
6180 val.scact_keynumber = ep->active_key_id;
6182 len = sizeof(struct sctp_authkeyid);
6183 if (put_user(len, optlen))
6185 if (copy_to_user(optval, &val, len))
6191 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6192 char __user *optval, int __user *optlen)
6194 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6195 struct sctp_authchunks __user *p = (void __user *)optval;
6196 struct sctp_authchunks val;
6197 struct sctp_association *asoc;
6198 struct sctp_chunks_param *ch;
6202 if (!ep->auth_enable)
6205 if (len < sizeof(struct sctp_authchunks))
6208 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6211 to = p->gauth_chunks;
6212 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6216 ch = asoc->peer.peer_chunks;
6220 /* See if the user provided enough room for all the data */
6221 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6222 if (len < num_chunks)
6225 if (copy_to_user(to, ch->chunks, num_chunks))
6228 len = sizeof(struct sctp_authchunks) + num_chunks;
6229 if (put_user(len, optlen))
6231 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6236 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6237 char __user *optval, int __user *optlen)
6239 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6240 struct sctp_authchunks __user *p = (void __user *)optval;
6241 struct sctp_authchunks val;
6242 struct sctp_association *asoc;
6243 struct sctp_chunks_param *ch;
6247 if (!ep->auth_enable)
6250 if (len < sizeof(struct sctp_authchunks))
6253 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6256 to = p->gauth_chunks;
6257 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6258 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6262 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6264 ch = ep->auth_chunk_list;
6269 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6270 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6273 if (copy_to_user(to, ch->chunks, num_chunks))
6276 len = sizeof(struct sctp_authchunks) + num_chunks;
6277 if (put_user(len, optlen))
6279 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6286 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6287 * This option gets the current number of associations that are attached
6288 * to a one-to-many style socket. The option value is an uint32_t.
6290 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6291 char __user *optval, int __user *optlen)
6293 struct sctp_sock *sp = sctp_sk(sk);
6294 struct sctp_association *asoc;
6297 if (sctp_style(sk, TCP))
6300 if (len < sizeof(u32))
6305 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6309 if (put_user(len, optlen))
6311 if (copy_to_user(optval, &val, len))
6318 * 8.1.23 SCTP_AUTO_ASCONF
6319 * See the corresponding setsockopt entry as description
6321 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6322 char __user *optval, int __user *optlen)
6326 if (len < sizeof(int))
6330 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6332 if (put_user(len, optlen))
6334 if (copy_to_user(optval, &val, len))
6340 * 8.2.6. Get the Current Identifiers of Associations
6341 * (SCTP_GET_ASSOC_ID_LIST)
6343 * This option gets the current list of SCTP association identifiers of
6344 * the SCTP associations handled by a one-to-many style socket.
6346 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6347 char __user *optval, int __user *optlen)
6349 struct sctp_sock *sp = sctp_sk(sk);
6350 struct sctp_association *asoc;
6351 struct sctp_assoc_ids *ids;
6354 if (sctp_style(sk, TCP))
6357 if (len < sizeof(struct sctp_assoc_ids))
6360 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6364 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6367 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6369 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6373 ids->gaids_number_of_ids = num;
6375 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6376 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6379 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6389 * SCTP_PEER_ADDR_THLDS
6391 * This option allows us to fetch the partially failed threshold for one or all
6392 * transports in an association. See Section 6.1 of:
6393 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6395 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6396 char __user *optval,
6400 struct sctp_paddrthlds val;
6401 struct sctp_transport *trans;
6402 struct sctp_association *asoc;
6404 if (len < sizeof(struct sctp_paddrthlds))
6406 len = sizeof(struct sctp_paddrthlds);
6407 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6410 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6411 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6415 val.spt_pathpfthld = asoc->pf_retrans;
6416 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6418 trans = sctp_addr_id2transport(sk, &val.spt_address,
6423 val.spt_pathmaxrxt = trans->pathmaxrxt;
6424 val.spt_pathpfthld = trans->pf_retrans;
6427 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6434 * SCTP_GET_ASSOC_STATS
6436 * This option retrieves local per endpoint statistics. It is modeled
6437 * after OpenSolaris' implementation
6439 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6440 char __user *optval,
6443 struct sctp_assoc_stats sas;
6444 struct sctp_association *asoc = NULL;
6446 /* User must provide at least the assoc id */
6447 if (len < sizeof(sctp_assoc_t))
6450 /* Allow the struct to grow and fill in as much as possible */
6451 len = min_t(size_t, len, sizeof(sas));
6453 if (copy_from_user(&sas, optval, len))
6456 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6460 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6461 sas.sas_gapcnt = asoc->stats.gapcnt;
6462 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6463 sas.sas_osacks = asoc->stats.osacks;
6464 sas.sas_isacks = asoc->stats.isacks;
6465 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6466 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6467 sas.sas_oodchunks = asoc->stats.oodchunks;
6468 sas.sas_iodchunks = asoc->stats.iodchunks;
6469 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6470 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6471 sas.sas_idupchunks = asoc->stats.idupchunks;
6472 sas.sas_opackets = asoc->stats.opackets;
6473 sas.sas_ipackets = asoc->stats.ipackets;
6475 /* New high max rto observed, will return 0 if not a single
6476 * RTO update took place. obs_rto_ipaddr will be bogus
6479 sas.sas_maxrto = asoc->stats.max_obs_rto;
6480 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6481 sizeof(struct sockaddr_storage));
6483 /* Mark beginning of a new observation period */
6484 asoc->stats.max_obs_rto = asoc->rto_min;
6486 if (put_user(len, optlen))
6489 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6491 if (copy_to_user(optval, &sas, len))
6497 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6498 char __user *optval,
6503 if (len < sizeof(int))
6507 if (sctp_sk(sk)->recvrcvinfo)
6509 if (put_user(len, optlen))
6511 if (copy_to_user(optval, &val, len))
6517 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6518 char __user *optval,
6523 if (len < sizeof(int))
6527 if (sctp_sk(sk)->recvnxtinfo)
6529 if (put_user(len, optlen))
6531 if (copy_to_user(optval, &val, len))
6537 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6538 char __user *optval,
6541 struct sctp_assoc_value params;
6542 struct sctp_association *asoc;
6543 int retval = -EFAULT;
6545 if (len < sizeof(params)) {
6550 len = sizeof(params);
6551 if (copy_from_user(¶ms, optval, len))
6554 asoc = sctp_id2assoc(sk, params.assoc_id);
6556 params.assoc_value = asoc->prsctp_enable;
6557 } else if (!params.assoc_id) {
6558 struct sctp_sock *sp = sctp_sk(sk);
6560 params.assoc_value = sp->ep->prsctp_enable;
6566 if (put_user(len, optlen))
6569 if (copy_to_user(optval, ¶ms, len))
6578 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6579 char __user *optval,
6582 struct sctp_default_prinfo info;
6583 struct sctp_association *asoc;
6584 int retval = -EFAULT;
6586 if (len < sizeof(info)) {
6592 if (copy_from_user(&info, optval, len))
6595 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6597 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6598 info.pr_value = asoc->default_timetolive;
6599 } else if (!info.pr_assoc_id) {
6600 struct sctp_sock *sp = sctp_sk(sk);
6602 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6603 info.pr_value = sp->default_timetolive;
6609 if (put_user(len, optlen))
6612 if (copy_to_user(optval, &info, len))
6621 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6622 char __user *optval,
6625 struct sctp_prstatus params;
6626 struct sctp_association *asoc;
6628 int retval = -EINVAL;
6630 if (len < sizeof(params))
6633 len = sizeof(params);
6634 if (copy_from_user(¶ms, optval, len)) {
6639 policy = params.sprstat_policy;
6640 if (policy & ~SCTP_PR_SCTP_MASK)
6643 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6647 if (policy == SCTP_PR_SCTP_NONE) {
6648 params.sprstat_abandoned_unsent = 0;
6649 params.sprstat_abandoned_sent = 0;
6650 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6651 params.sprstat_abandoned_unsent +=
6652 asoc->abandoned_unsent[policy];
6653 params.sprstat_abandoned_sent +=
6654 asoc->abandoned_sent[policy];
6657 params.sprstat_abandoned_unsent =
6658 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6659 params.sprstat_abandoned_sent =
6660 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6663 if (put_user(len, optlen)) {
6668 if (copy_to_user(optval, ¶ms, len)) {
6679 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
6680 char __user *optval,
6683 struct sctp_stream_out *streamout;
6684 struct sctp_association *asoc;
6685 struct sctp_prstatus params;
6686 int retval = -EINVAL;
6689 if (len < sizeof(params))
6692 len = sizeof(params);
6693 if (copy_from_user(¶ms, optval, len)) {
6698 policy = params.sprstat_policy;
6699 if (policy & ~SCTP_PR_SCTP_MASK)
6702 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6703 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6706 streamout = &asoc->stream.out[params.sprstat_sid];
6707 if (policy == SCTP_PR_SCTP_NONE) {
6708 params.sprstat_abandoned_unsent = 0;
6709 params.sprstat_abandoned_sent = 0;
6710 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6711 params.sprstat_abandoned_unsent +=
6712 streamout->abandoned_unsent[policy];
6713 params.sprstat_abandoned_sent +=
6714 streamout->abandoned_sent[policy];
6717 params.sprstat_abandoned_unsent =
6718 streamout->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6719 params.sprstat_abandoned_sent =
6720 streamout->abandoned_sent[__SCTP_PR_INDEX(policy)];
6723 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
6734 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
6735 char __user *optval,
6738 struct sctp_assoc_value params;
6739 struct sctp_association *asoc;
6740 int retval = -EFAULT;
6742 if (len < sizeof(params)) {
6747 len = sizeof(params);
6748 if (copy_from_user(¶ms, optval, len))
6751 asoc = sctp_id2assoc(sk, params.assoc_id);
6753 params.assoc_value = asoc->reconf_enable;
6754 } else if (!params.assoc_id) {
6755 struct sctp_sock *sp = sctp_sk(sk);
6757 params.assoc_value = sp->ep->reconf_enable;
6763 if (put_user(len, optlen))
6766 if (copy_to_user(optval, ¶ms, len))
6775 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
6776 char __user *optval,
6779 struct sctp_assoc_value params;
6780 struct sctp_association *asoc;
6781 int retval = -EFAULT;
6783 if (len < sizeof(params)) {
6788 len = sizeof(params);
6789 if (copy_from_user(¶ms, optval, len))
6792 asoc = sctp_id2assoc(sk, params.assoc_id);
6794 params.assoc_value = asoc->strreset_enable;
6795 } else if (!params.assoc_id) {
6796 struct sctp_sock *sp = sctp_sk(sk);
6798 params.assoc_value = sp->ep->strreset_enable;
6804 if (put_user(len, optlen))
6807 if (copy_to_user(optval, ¶ms, len))
6816 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6817 char __user *optval, int __user *optlen)
6822 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6824 /* I can hardly begin to describe how wrong this is. This is
6825 * so broken as to be worse than useless. The API draft
6826 * REALLY is NOT helpful here... I am not convinced that the
6827 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6828 * are at all well-founded.
6830 if (level != SOL_SCTP) {
6831 struct sctp_af *af = sctp_sk(sk)->pf->af;
6833 retval = af->getsockopt(sk, level, optname, optval, optlen);
6837 if (get_user(len, optlen))
6847 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6849 case SCTP_DISABLE_FRAGMENTS:
6850 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6854 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6856 case SCTP_AUTOCLOSE:
6857 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6859 case SCTP_SOCKOPT_PEELOFF:
6860 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6862 case SCTP_SOCKOPT_PEELOFF_FLAGS:
6863 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
6865 case SCTP_PEER_ADDR_PARAMS:
6866 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6869 case SCTP_DELAYED_SACK:
6870 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6874 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6876 case SCTP_GET_PEER_ADDRS:
6877 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6880 case SCTP_GET_LOCAL_ADDRS:
6881 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6884 case SCTP_SOCKOPT_CONNECTX3:
6885 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6887 case SCTP_DEFAULT_SEND_PARAM:
6888 retval = sctp_getsockopt_default_send_param(sk, len,
6891 case SCTP_DEFAULT_SNDINFO:
6892 retval = sctp_getsockopt_default_sndinfo(sk, len,
6895 case SCTP_PRIMARY_ADDR:
6896 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6899 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6902 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6904 case SCTP_ASSOCINFO:
6905 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6907 case SCTP_I_WANT_MAPPED_V4_ADDR:
6908 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6911 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6913 case SCTP_GET_PEER_ADDR_INFO:
6914 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6917 case SCTP_ADAPTATION_LAYER:
6918 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6922 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6924 case SCTP_FRAGMENT_INTERLEAVE:
6925 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6928 case SCTP_PARTIAL_DELIVERY_POINT:
6929 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6932 case SCTP_MAX_BURST:
6933 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6936 case SCTP_AUTH_CHUNK:
6937 case SCTP_AUTH_DELETE_KEY:
6938 retval = -EOPNOTSUPP;
6940 case SCTP_HMAC_IDENT:
6941 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6943 case SCTP_AUTH_ACTIVE_KEY:
6944 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6946 case SCTP_PEER_AUTH_CHUNKS:
6947 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6950 case SCTP_LOCAL_AUTH_CHUNKS:
6951 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6954 case SCTP_GET_ASSOC_NUMBER:
6955 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6957 case SCTP_GET_ASSOC_ID_LIST:
6958 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6960 case SCTP_AUTO_ASCONF:
6961 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6963 case SCTP_PEER_ADDR_THLDS:
6964 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6966 case SCTP_GET_ASSOC_STATS:
6967 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6969 case SCTP_RECVRCVINFO:
6970 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6972 case SCTP_RECVNXTINFO:
6973 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6975 case SCTP_PR_SUPPORTED:
6976 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
6978 case SCTP_DEFAULT_PRINFO:
6979 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
6982 case SCTP_PR_ASSOC_STATUS:
6983 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
6986 case SCTP_PR_STREAM_STATUS:
6987 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
6990 case SCTP_RECONFIG_SUPPORTED:
6991 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
6994 case SCTP_ENABLE_STREAM_RESET:
6995 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
6999 retval = -ENOPROTOOPT;
7007 static int sctp_hash(struct sock *sk)
7013 static void sctp_unhash(struct sock *sk)
7018 /* Check if port is acceptable. Possibly find first available port.
7020 * The port hash table (contained in the 'global' SCTP protocol storage
7021 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7022 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7023 * list (the list number is the port number hashed out, so as you
7024 * would expect from a hash function, all the ports in a given list have
7025 * such a number that hashes out to the same list number; you were
7026 * expecting that, right?); so each list has a set of ports, with a
7027 * link to the socket (struct sock) that uses it, the port number and
7028 * a fastreuse flag (FIXME: NPI ipg).
7030 static struct sctp_bind_bucket *sctp_bucket_create(
7031 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7033 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7035 struct sctp_bind_hashbucket *head; /* hash list */
7036 struct sctp_bind_bucket *pp;
7037 unsigned short snum;
7040 snum = ntohs(addr->v4.sin_port);
7042 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7047 /* Search for an available port. */
7048 int low, high, remaining, index;
7050 struct net *net = sock_net(sk);
7052 inet_get_local_port_range(net, &low, &high);
7053 remaining = (high - low) + 1;
7054 rover = prandom_u32() % remaining + low;
7058 if ((rover < low) || (rover > high))
7060 if (inet_is_local_reserved_port(net, rover))
7062 index = sctp_phashfn(sock_net(sk), rover);
7063 head = &sctp_port_hashtable[index];
7064 spin_lock(&head->lock);
7065 sctp_for_each_hentry(pp, &head->chain)
7066 if ((pp->port == rover) &&
7067 net_eq(sock_net(sk), pp->net))
7071 spin_unlock(&head->lock);
7072 } while (--remaining > 0);
7074 /* Exhausted local port range during search? */
7079 /* OK, here is the one we will use. HEAD (the port
7080 * hash table list entry) is non-NULL and we hold it's
7085 /* We are given an specific port number; we verify
7086 * that it is not being used. If it is used, we will
7087 * exahust the search in the hash list corresponding
7088 * to the port number (snum) - we detect that with the
7089 * port iterator, pp being NULL.
7091 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7092 spin_lock(&head->lock);
7093 sctp_for_each_hentry(pp, &head->chain) {
7094 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7101 if (!hlist_empty(&pp->owner)) {
7102 /* We had a port hash table hit - there is an
7103 * available port (pp != NULL) and it is being
7104 * used by other socket (pp->owner not empty); that other
7105 * socket is going to be sk2.
7107 int reuse = sk->sk_reuse;
7110 pr_debug("%s: found a possible match\n", __func__);
7112 if (pp->fastreuse && sk->sk_reuse &&
7113 sk->sk_state != SCTP_SS_LISTENING)
7116 /* Run through the list of sockets bound to the port
7117 * (pp->port) [via the pointers bind_next and
7118 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7119 * we get the endpoint they describe and run through
7120 * the endpoint's list of IP (v4 or v6) addresses,
7121 * comparing each of the addresses with the address of
7122 * the socket sk. If we find a match, then that means
7123 * that this port/socket (sk) combination are already
7126 sk_for_each_bound(sk2, &pp->owner) {
7127 struct sctp_endpoint *ep2;
7128 ep2 = sctp_sk(sk2)->ep;
7131 (reuse && sk2->sk_reuse &&
7132 sk2->sk_state != SCTP_SS_LISTENING))
7135 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7136 sctp_sk(sk2), sctp_sk(sk))) {
7142 pr_debug("%s: found a match\n", __func__);
7145 /* If there was a hash table miss, create a new port. */
7147 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7150 /* In either case (hit or miss), make sure fastreuse is 1 only
7151 * if sk->sk_reuse is too (that is, if the caller requested
7152 * SO_REUSEADDR on this socket -sk-).
7154 if (hlist_empty(&pp->owner)) {
7155 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
7159 } else if (pp->fastreuse &&
7160 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
7163 /* We are set, so fill up all the data in the hash table
7164 * entry, tie the socket list information with the rest of the
7165 * sockets FIXME: Blurry, NPI (ipg).
7168 if (!sctp_sk(sk)->bind_hash) {
7169 inet_sk(sk)->inet_num = snum;
7170 sk_add_bind_node(sk, &pp->owner);
7171 sctp_sk(sk)->bind_hash = pp;
7176 spin_unlock(&head->lock);
7183 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7184 * port is requested.
7186 static int sctp_get_port(struct sock *sk, unsigned short snum)
7188 union sctp_addr addr;
7189 struct sctp_af *af = sctp_sk(sk)->pf->af;
7191 /* Set up a dummy address struct from the sk. */
7192 af->from_sk(&addr, sk);
7193 addr.v4.sin_port = htons(snum);
7195 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7196 return !!sctp_get_port_local(sk, &addr);
7200 * Move a socket to LISTENING state.
7202 static int sctp_listen_start(struct sock *sk, int backlog)
7204 struct sctp_sock *sp = sctp_sk(sk);
7205 struct sctp_endpoint *ep = sp->ep;
7206 struct crypto_shash *tfm = NULL;
7209 /* Allocate HMAC for generating cookie. */
7210 if (!sp->hmac && sp->sctp_hmac_alg) {
7211 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7212 tfm = crypto_alloc_shash(alg, 0, 0);
7214 net_info_ratelimited("failed to load transform for %s: %ld\n",
7215 sp->sctp_hmac_alg, PTR_ERR(tfm));
7218 sctp_sk(sk)->hmac = tfm;
7222 * If a bind() or sctp_bindx() is not called prior to a listen()
7223 * call that allows new associations to be accepted, the system
7224 * picks an ephemeral port and will choose an address set equivalent
7225 * to binding with a wildcard address.
7227 * This is not currently spelled out in the SCTP sockets
7228 * extensions draft, but follows the practice as seen in TCP
7232 sk->sk_state = SCTP_SS_LISTENING;
7233 if (!ep->base.bind_addr.port) {
7234 if (sctp_autobind(sk))
7237 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7238 sk->sk_state = SCTP_SS_CLOSED;
7243 sk->sk_max_ack_backlog = backlog;
7244 sctp_hash_endpoint(ep);
7249 * 4.1.3 / 5.1.3 listen()
7251 * By default, new associations are not accepted for UDP style sockets.
7252 * An application uses listen() to mark a socket as being able to
7253 * accept new associations.
7255 * On TCP style sockets, applications use listen() to ready the SCTP
7256 * endpoint for accepting inbound associations.
7258 * On both types of endpoints a backlog of '0' disables listening.
7260 * Move a socket to LISTENING state.
7262 int sctp_inet_listen(struct socket *sock, int backlog)
7264 struct sock *sk = sock->sk;
7265 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7268 if (unlikely(backlog < 0))
7273 /* Peeled-off sockets are not allowed to listen(). */
7274 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7277 if (sock->state != SS_UNCONNECTED)
7280 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7283 /* If backlog is zero, disable listening. */
7285 if (sctp_sstate(sk, CLOSED))
7289 sctp_unhash_endpoint(ep);
7290 sk->sk_state = SCTP_SS_CLOSED;
7292 sctp_sk(sk)->bind_hash->fastreuse = 1;
7296 /* If we are already listening, just update the backlog */
7297 if (sctp_sstate(sk, LISTENING))
7298 sk->sk_max_ack_backlog = backlog;
7300 err = sctp_listen_start(sk, backlog);
7312 * This function is done by modeling the current datagram_poll() and the
7313 * tcp_poll(). Note that, based on these implementations, we don't
7314 * lock the socket in this function, even though it seems that,
7315 * ideally, locking or some other mechanisms can be used to ensure
7316 * the integrity of the counters (sndbuf and wmem_alloc) used
7317 * in this place. We assume that we don't need locks either until proven
7320 * Another thing to note is that we include the Async I/O support
7321 * here, again, by modeling the current TCP/UDP code. We don't have
7322 * a good way to test with it yet.
7324 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7326 struct sock *sk = sock->sk;
7327 struct sctp_sock *sp = sctp_sk(sk);
7330 poll_wait(file, sk_sleep(sk), wait);
7332 sock_rps_record_flow(sk);
7334 /* A TCP-style listening socket becomes readable when the accept queue
7337 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7338 return (!list_empty(&sp->ep->asocs)) ?
7339 (POLLIN | POLLRDNORM) : 0;
7343 /* Is there any exceptional events? */
7344 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7346 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
7347 if (sk->sk_shutdown & RCV_SHUTDOWN)
7348 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
7349 if (sk->sk_shutdown == SHUTDOWN_MASK)
7352 /* Is it readable? Reconsider this code with TCP-style support. */
7353 if (!skb_queue_empty(&sk->sk_receive_queue))
7354 mask |= POLLIN | POLLRDNORM;
7356 /* The association is either gone or not ready. */
7357 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7360 /* Is it writable? */
7361 if (sctp_writeable(sk)) {
7362 mask |= POLLOUT | POLLWRNORM;
7364 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7366 * Since the socket is not locked, the buffer
7367 * might be made available after the writeable check and
7368 * before the bit is set. This could cause a lost I/O
7369 * signal. tcp_poll() has a race breaker for this race
7370 * condition. Based on their implementation, we put
7371 * in the following code to cover it as well.
7373 if (sctp_writeable(sk))
7374 mask |= POLLOUT | POLLWRNORM;
7379 /********************************************************************
7380 * 2nd Level Abstractions
7381 ********************************************************************/
7383 static struct sctp_bind_bucket *sctp_bucket_create(
7384 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
7386 struct sctp_bind_bucket *pp;
7388 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
7390 SCTP_DBG_OBJCNT_INC(bind_bucket);
7393 INIT_HLIST_HEAD(&pp->owner);
7395 hlist_add_head(&pp->node, &head->chain);
7400 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7401 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7403 if (pp && hlist_empty(&pp->owner)) {
7404 __hlist_del(&pp->node);
7405 kmem_cache_free(sctp_bucket_cachep, pp);
7406 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7410 /* Release this socket's reference to a local port. */
7411 static inline void __sctp_put_port(struct sock *sk)
7413 struct sctp_bind_hashbucket *head =
7414 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7415 inet_sk(sk)->inet_num)];
7416 struct sctp_bind_bucket *pp;
7418 spin_lock(&head->lock);
7419 pp = sctp_sk(sk)->bind_hash;
7420 __sk_del_bind_node(sk);
7421 sctp_sk(sk)->bind_hash = NULL;
7422 inet_sk(sk)->inet_num = 0;
7423 sctp_bucket_destroy(pp);
7424 spin_unlock(&head->lock);
7427 void sctp_put_port(struct sock *sk)
7430 __sctp_put_port(sk);
7435 * The system picks an ephemeral port and choose an address set equivalent
7436 * to binding with a wildcard address.
7437 * One of those addresses will be the primary address for the association.
7438 * This automatically enables the multihoming capability of SCTP.
7440 static int sctp_autobind(struct sock *sk)
7442 union sctp_addr autoaddr;
7446 /* Initialize a local sockaddr structure to INADDR_ANY. */
7447 af = sctp_sk(sk)->pf->af;
7449 port = htons(inet_sk(sk)->inet_num);
7450 af->inaddr_any(&autoaddr, port);
7452 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7455 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7458 * 4.2 The cmsghdr Structure *
7460 * When ancillary data is sent or received, any number of ancillary data
7461 * objects can be specified by the msg_control and msg_controllen members of
7462 * the msghdr structure, because each object is preceded by
7463 * a cmsghdr structure defining the object's length (the cmsg_len member).
7464 * Historically Berkeley-derived implementations have passed only one object
7465 * at a time, but this API allows multiple objects to be
7466 * passed in a single call to sendmsg() or recvmsg(). The following example
7467 * shows two ancillary data objects in a control buffer.
7469 * |<--------------------------- msg_controllen -------------------------->|
7472 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7474 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7477 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7479 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7482 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7483 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7485 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7487 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7494 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
7496 struct msghdr *my_msg = (struct msghdr *)msg;
7497 struct cmsghdr *cmsg;
7499 for_each_cmsghdr(cmsg, my_msg) {
7500 if (!CMSG_OK(my_msg, cmsg))
7503 /* Should we parse this header or ignore? */
7504 if (cmsg->cmsg_level != IPPROTO_SCTP)
7507 /* Strictly check lengths following example in SCM code. */
7508 switch (cmsg->cmsg_type) {
7510 /* SCTP Socket API Extension
7511 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7513 * This cmsghdr structure provides information for
7514 * initializing new SCTP associations with sendmsg().
7515 * The SCTP_INITMSG socket option uses this same data
7516 * structure. This structure is not used for
7519 * cmsg_level cmsg_type cmsg_data[]
7520 * ------------ ------------ ----------------------
7521 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7523 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
7526 cmsgs->init = CMSG_DATA(cmsg);
7530 /* SCTP Socket API Extension
7531 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7533 * This cmsghdr structure specifies SCTP options for
7534 * sendmsg() and describes SCTP header information
7535 * about a received message through recvmsg().
7537 * cmsg_level cmsg_type cmsg_data[]
7538 * ------------ ------------ ----------------------
7539 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7541 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
7544 cmsgs->srinfo = CMSG_DATA(cmsg);
7546 if (cmsgs->srinfo->sinfo_flags &
7547 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7548 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7549 SCTP_ABORT | SCTP_EOF))
7554 /* SCTP Socket API Extension
7555 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7557 * This cmsghdr structure specifies SCTP options for
7558 * sendmsg(). This structure and SCTP_RCVINFO replaces
7559 * SCTP_SNDRCV which has been deprecated.
7561 * cmsg_level cmsg_type cmsg_data[]
7562 * ------------ ------------ ---------------------
7563 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7565 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7568 cmsgs->sinfo = CMSG_DATA(cmsg);
7570 if (cmsgs->sinfo->snd_flags &
7571 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7572 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7573 SCTP_ABORT | SCTP_EOF))
7585 * Wait for a packet..
7586 * Note: This function is the same function as in core/datagram.c
7587 * with a few modifications to make lksctp work.
7589 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
7594 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7596 /* Socket errors? */
7597 error = sock_error(sk);
7601 if (!skb_queue_empty(&sk->sk_receive_queue))
7604 /* Socket shut down? */
7605 if (sk->sk_shutdown & RCV_SHUTDOWN)
7608 /* Sequenced packets can come disconnected. If so we report the
7613 /* Is there a good reason to think that we may receive some data? */
7614 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
7617 /* Handle signals. */
7618 if (signal_pending(current))
7621 /* Let another process have a go. Since we are going to sleep
7622 * anyway. Note: This may cause odd behaviors if the message
7623 * does not fit in the user's buffer, but this seems to be the
7624 * only way to honor MSG_DONTWAIT realistically.
7627 *timeo_p = schedule_timeout(*timeo_p);
7631 finish_wait(sk_sleep(sk), &wait);
7635 error = sock_intr_errno(*timeo_p);
7638 finish_wait(sk_sleep(sk), &wait);
7643 /* Receive a datagram.
7644 * Note: This is pretty much the same routine as in core/datagram.c
7645 * with a few changes to make lksctp work.
7647 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
7648 int noblock, int *err)
7651 struct sk_buff *skb;
7654 timeo = sock_rcvtimeo(sk, noblock);
7656 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
7657 MAX_SCHEDULE_TIMEOUT);
7660 /* Again only user level code calls this function,
7661 * so nothing interrupt level
7662 * will suddenly eat the receive_queue.
7664 * Look at current nfs client by the way...
7665 * However, this function was correct in any case. 8)
7667 if (flags & MSG_PEEK) {
7668 skb = skb_peek(&sk->sk_receive_queue);
7670 refcount_inc(&skb->users);
7672 skb = __skb_dequeue(&sk->sk_receive_queue);
7678 /* Caller is allowed not to check sk->sk_err before calling. */
7679 error = sock_error(sk);
7683 if (sk->sk_shutdown & RCV_SHUTDOWN)
7686 if (sk_can_busy_loop(sk)) {
7687 sk_busy_loop(sk, noblock);
7689 if (!skb_queue_empty(&sk->sk_receive_queue))
7693 /* User doesn't want to wait. */
7697 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
7706 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7707 static void __sctp_write_space(struct sctp_association *asoc)
7709 struct sock *sk = asoc->base.sk;
7711 if (sctp_wspace(asoc) <= 0)
7714 if (waitqueue_active(&asoc->wait))
7715 wake_up_interruptible(&asoc->wait);
7717 if (sctp_writeable(sk)) {
7718 struct socket_wq *wq;
7721 wq = rcu_dereference(sk->sk_wq);
7723 if (waitqueue_active(&wq->wait))
7724 wake_up_interruptible(&wq->wait);
7726 /* Note that we try to include the Async I/O support
7727 * here by modeling from the current TCP/UDP code.
7728 * We have not tested with it yet.
7730 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7731 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
7737 static void sctp_wake_up_waiters(struct sock *sk,
7738 struct sctp_association *asoc)
7740 struct sctp_association *tmp = asoc;
7742 /* We do accounting for the sndbuf space per association,
7743 * so we only need to wake our own association.
7745 if (asoc->ep->sndbuf_policy)
7746 return __sctp_write_space(asoc);
7748 /* If association goes down and is just flushing its
7749 * outq, then just normally notify others.
7751 if (asoc->base.dead)
7752 return sctp_write_space(sk);
7754 /* Accounting for the sndbuf space is per socket, so we
7755 * need to wake up others, try to be fair and in case of
7756 * other associations, let them have a go first instead
7757 * of just doing a sctp_write_space() call.
7759 * Note that we reach sctp_wake_up_waiters() only when
7760 * associations free up queued chunks, thus we are under
7761 * lock and the list of associations on a socket is
7762 * guaranteed not to change.
7764 for (tmp = list_next_entry(tmp, asocs); 1;
7765 tmp = list_next_entry(tmp, asocs)) {
7766 /* Manually skip the head element. */
7767 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
7769 /* Wake up association. */
7770 __sctp_write_space(tmp);
7771 /* We've reached the end. */
7777 /* Do accounting for the sndbuf space.
7778 * Decrement the used sndbuf space of the corresponding association by the
7779 * data size which was just transmitted(freed).
7781 static void sctp_wfree(struct sk_buff *skb)
7783 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
7784 struct sctp_association *asoc = chunk->asoc;
7785 struct sock *sk = asoc->base.sk;
7787 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
7788 sizeof(struct sk_buff) +
7789 sizeof(struct sctp_chunk);
7791 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
7794 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7796 sk->sk_wmem_queued -= skb->truesize;
7797 sk_mem_uncharge(sk, skb->truesize);
7800 sctp_wake_up_waiters(sk, asoc);
7802 sctp_association_put(asoc);
7805 /* Do accounting for the receive space on the socket.
7806 * Accounting for the association is done in ulpevent.c
7807 * We set this as a destructor for the cloned data skbs so that
7808 * accounting is done at the correct time.
7810 void sctp_sock_rfree(struct sk_buff *skb)
7812 struct sock *sk = skb->sk;
7813 struct sctp_ulpevent *event = sctp_skb2event(skb);
7815 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
7818 * Mimic the behavior of sock_rfree
7820 sk_mem_uncharge(sk, event->rmem_len);
7824 /* Helper function to wait for space in the sndbuf. */
7825 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
7826 size_t msg_len, struct sock **orig_sk)
7828 struct sock *sk = asoc->base.sk;
7830 long current_timeo = *timeo_p;
7833 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
7836 /* Increment the association's refcnt. */
7837 sctp_association_hold(asoc);
7839 /* Wait on the association specific sndbuf space. */
7841 prepare_to_wait_exclusive(&asoc->wait, &wait,
7842 TASK_INTERRUPTIBLE);
7843 if (asoc->base.dead)
7847 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
7849 if (signal_pending(current))
7850 goto do_interrupted;
7851 if (msg_len <= sctp_wspace(asoc))
7854 /* Let another process have a go. Since we are going
7858 current_timeo = schedule_timeout(current_timeo);
7860 if (sk != asoc->base.sk) {
7866 *timeo_p = current_timeo;
7871 finish_wait(&asoc->wait, &wait);
7873 /* Release the association's refcnt. */
7874 sctp_association_put(asoc);
7887 err = sock_intr_errno(*timeo_p);
7895 void sctp_data_ready(struct sock *sk)
7897 struct socket_wq *wq;
7900 wq = rcu_dereference(sk->sk_wq);
7901 if (skwq_has_sleeper(wq))
7902 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7903 POLLRDNORM | POLLRDBAND);
7904 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7908 /* If socket sndbuf has changed, wake up all per association waiters. */
7909 void sctp_write_space(struct sock *sk)
7911 struct sctp_association *asoc;
7913 /* Wake up the tasks in each wait queue. */
7914 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7915 __sctp_write_space(asoc);
7919 /* Is there any sndbuf space available on the socket?
7921 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7922 * associations on the same socket. For a UDP-style socket with
7923 * multiple associations, it is possible for it to be "unwriteable"
7924 * prematurely. I assume that this is acceptable because
7925 * a premature "unwriteable" is better than an accidental "writeable" which
7926 * would cause an unwanted block under certain circumstances. For the 1-1
7927 * UDP-style sockets or TCP-style sockets, this code should work.
7930 static int sctp_writeable(struct sock *sk)
7934 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7940 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7941 * returns immediately with EINPROGRESS.
7943 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7945 struct sock *sk = asoc->base.sk;
7947 long current_timeo = *timeo_p;
7950 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7952 /* Increment the association's refcnt. */
7953 sctp_association_hold(asoc);
7956 prepare_to_wait_exclusive(&asoc->wait, &wait,
7957 TASK_INTERRUPTIBLE);
7960 if (sk->sk_shutdown & RCV_SHUTDOWN)
7962 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7965 if (signal_pending(current))
7966 goto do_interrupted;
7968 if (sctp_state(asoc, ESTABLISHED))
7971 /* Let another process have a go. Since we are going
7975 current_timeo = schedule_timeout(current_timeo);
7978 *timeo_p = current_timeo;
7982 finish_wait(&asoc->wait, &wait);
7984 /* Release the association's refcnt. */
7985 sctp_association_put(asoc);
7990 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7993 err = -ECONNREFUSED;
7997 err = sock_intr_errno(*timeo_p);
8005 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8007 struct sctp_endpoint *ep;
8011 ep = sctp_sk(sk)->ep;
8015 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8016 TASK_INTERRUPTIBLE);
8018 if (list_empty(&ep->asocs)) {
8020 timeo = schedule_timeout(timeo);
8025 if (!sctp_sstate(sk, LISTENING))
8029 if (!list_empty(&ep->asocs))
8032 err = sock_intr_errno(timeo);
8033 if (signal_pending(current))
8041 finish_wait(sk_sleep(sk), &wait);
8046 static void sctp_wait_for_close(struct sock *sk, long timeout)
8051 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8052 if (list_empty(&sctp_sk(sk)->ep->asocs))
8055 timeout = schedule_timeout(timeout);
8057 } while (!signal_pending(current) && timeout);
8059 finish_wait(sk_sleep(sk), &wait);
8062 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8064 struct sk_buff *frag;
8069 /* Don't forget the fragments. */
8070 skb_walk_frags(skb, frag)
8071 sctp_skb_set_owner_r_frag(frag, sk);
8074 sctp_skb_set_owner_r(skb, sk);
8077 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8078 struct sctp_association *asoc)
8080 struct inet_sock *inet = inet_sk(sk);
8081 struct inet_sock *newinet;
8083 newsk->sk_type = sk->sk_type;
8084 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8085 newsk->sk_flags = sk->sk_flags;
8086 newsk->sk_tsflags = sk->sk_tsflags;
8087 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8088 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8089 newsk->sk_reuse = sk->sk_reuse;
8091 newsk->sk_shutdown = sk->sk_shutdown;
8092 newsk->sk_destruct = sctp_destruct_sock;
8093 newsk->sk_family = sk->sk_family;
8094 newsk->sk_protocol = IPPROTO_SCTP;
8095 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8096 newsk->sk_sndbuf = sk->sk_sndbuf;
8097 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8098 newsk->sk_lingertime = sk->sk_lingertime;
8099 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8100 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8101 newsk->sk_rxhash = sk->sk_rxhash;
8103 newinet = inet_sk(newsk);
8105 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8106 * getsockname() and getpeername()
8108 newinet->inet_sport = inet->inet_sport;
8109 newinet->inet_saddr = inet->inet_saddr;
8110 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8111 newinet->inet_dport = htons(asoc->peer.port);
8112 newinet->pmtudisc = inet->pmtudisc;
8113 newinet->inet_id = asoc->next_tsn ^ jiffies;
8115 newinet->uc_ttl = inet->uc_ttl;
8116 newinet->mc_loop = 1;
8117 newinet->mc_ttl = 1;
8118 newinet->mc_index = 0;
8119 newinet->mc_list = NULL;
8121 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8122 net_enable_timestamp();
8124 security_sk_clone(sk, newsk);
8127 static inline void sctp_copy_descendant(struct sock *sk_to,
8128 const struct sock *sk_from)
8130 int ancestor_size = sizeof(struct inet_sock) +
8131 sizeof(struct sctp_sock) -
8132 offsetof(struct sctp_sock, auto_asconf_list);
8134 if (sk_from->sk_family == PF_INET6)
8135 ancestor_size += sizeof(struct ipv6_pinfo);
8137 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8140 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8141 * and its messages to the newsk.
8143 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8144 struct sctp_association *assoc,
8145 enum sctp_socket_type type)
8147 struct sctp_sock *oldsp = sctp_sk(oldsk);
8148 struct sctp_sock *newsp = sctp_sk(newsk);
8149 struct sctp_bind_bucket *pp; /* hash list port iterator */
8150 struct sctp_endpoint *newep = newsp->ep;
8151 struct sk_buff *skb, *tmp;
8152 struct sctp_ulpevent *event;
8153 struct sctp_bind_hashbucket *head;
8155 /* Migrate socket buffer sizes and all the socket level options to the
8158 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8159 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8160 /* Brute force copy old sctp opt. */
8161 sctp_copy_descendant(newsk, oldsk);
8163 /* Restore the ep value that was overwritten with the above structure
8169 /* Hook this new socket in to the bind_hash list. */
8170 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8171 inet_sk(oldsk)->inet_num)];
8172 spin_lock_bh(&head->lock);
8173 pp = sctp_sk(oldsk)->bind_hash;
8174 sk_add_bind_node(newsk, &pp->owner);
8175 sctp_sk(newsk)->bind_hash = pp;
8176 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8177 spin_unlock_bh(&head->lock);
8179 /* Copy the bind_addr list from the original endpoint to the new
8180 * endpoint so that we can handle restarts properly
8182 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8183 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8185 /* Move any messages in the old socket's receive queue that are for the
8186 * peeled off association to the new socket's receive queue.
8188 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8189 event = sctp_skb2event(skb);
8190 if (event->asoc == assoc) {
8191 __skb_unlink(skb, &oldsk->sk_receive_queue);
8192 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8193 sctp_skb_set_owner_r_frag(skb, newsk);
8197 /* Clean up any messages pending delivery due to partial
8198 * delivery. Three cases:
8199 * 1) No partial deliver; no work.
8200 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8201 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8203 skb_queue_head_init(&newsp->pd_lobby);
8204 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8206 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8207 struct sk_buff_head *queue;
8209 /* Decide which queue to move pd_lobby skbs to. */
8210 if (assoc->ulpq.pd_mode) {
8211 queue = &newsp->pd_lobby;
8213 queue = &newsk->sk_receive_queue;
8215 /* Walk through the pd_lobby, looking for skbs that
8216 * need moved to the new socket.
8218 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8219 event = sctp_skb2event(skb);
8220 if (event->asoc == assoc) {
8221 __skb_unlink(skb, &oldsp->pd_lobby);
8222 __skb_queue_tail(queue, skb);
8223 sctp_skb_set_owner_r_frag(skb, newsk);
8227 /* Clear up any skbs waiting for the partial
8228 * delivery to finish.
8230 if (assoc->ulpq.pd_mode)
8231 sctp_clear_pd(oldsk, NULL);
8235 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
8236 sctp_skb_set_owner_r_frag(skb, newsk);
8238 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
8239 sctp_skb_set_owner_r_frag(skb, newsk);
8241 /* Set the type of socket to indicate that it is peeled off from the
8242 * original UDP-style socket or created with the accept() call on a
8243 * TCP-style socket..
8247 /* Mark the new socket "in-use" by the user so that any packets
8248 * that may arrive on the association after we've moved it are
8249 * queued to the backlog. This prevents a potential race between
8250 * backlog processing on the old socket and new-packet processing
8251 * on the new socket.
8253 * The caller has just allocated newsk so we can guarantee that other
8254 * paths won't try to lock it and then oldsk.
8256 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8257 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
8258 sctp_assoc_migrate(assoc, newsk);
8259 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
8261 /* If the association on the newsk is already closed before accept()
8262 * is called, set RCV_SHUTDOWN flag.
8264 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8265 newsk->sk_state = SCTP_SS_CLOSED;
8266 newsk->sk_shutdown |= RCV_SHUTDOWN;
8268 newsk->sk_state = SCTP_SS_ESTABLISHED;
8271 release_sock(newsk);
8275 /* This proto struct describes the ULP interface for SCTP. */
8276 struct proto sctp_prot = {
8278 .owner = THIS_MODULE,
8279 .close = sctp_close,
8280 .connect = sctp_connect,
8281 .disconnect = sctp_disconnect,
8282 .accept = sctp_accept,
8283 .ioctl = sctp_ioctl,
8284 .init = sctp_init_sock,
8285 .destroy = sctp_destroy_sock,
8286 .shutdown = sctp_shutdown,
8287 .setsockopt = sctp_setsockopt,
8288 .getsockopt = sctp_getsockopt,
8289 .sendmsg = sctp_sendmsg,
8290 .recvmsg = sctp_recvmsg,
8292 .backlog_rcv = sctp_backlog_rcv,
8294 .unhash = sctp_unhash,
8295 .get_port = sctp_get_port,
8296 .obj_size = sizeof(struct sctp_sock),
8297 .sysctl_mem = sysctl_sctp_mem,
8298 .sysctl_rmem = sysctl_sctp_rmem,
8299 .sysctl_wmem = sysctl_sctp_wmem,
8300 .memory_pressure = &sctp_memory_pressure,
8301 .enter_memory_pressure = sctp_enter_memory_pressure,
8302 .memory_allocated = &sctp_memory_allocated,
8303 .sockets_allocated = &sctp_sockets_allocated,
8306 #if IS_ENABLED(CONFIG_IPV6)
8308 #include <net/transp_v6.h>
8309 static void sctp_v6_destroy_sock(struct sock *sk)
8311 sctp_destroy_sock(sk);
8312 inet6_destroy_sock(sk);
8315 struct proto sctpv6_prot = {
8317 .owner = THIS_MODULE,
8318 .close = sctp_close,
8319 .connect = sctp_connect,
8320 .disconnect = sctp_disconnect,
8321 .accept = sctp_accept,
8322 .ioctl = sctp_ioctl,
8323 .init = sctp_init_sock,
8324 .destroy = sctp_v6_destroy_sock,
8325 .shutdown = sctp_shutdown,
8326 .setsockopt = sctp_setsockopt,
8327 .getsockopt = sctp_getsockopt,
8328 .sendmsg = sctp_sendmsg,
8329 .recvmsg = sctp_recvmsg,
8331 .backlog_rcv = sctp_backlog_rcv,
8333 .unhash = sctp_unhash,
8334 .get_port = sctp_get_port,
8335 .obj_size = sizeof(struct sctp6_sock),
8336 .sysctl_mem = sysctl_sctp_mem,
8337 .sysctl_rmem = sysctl_sctp_rmem,
8338 .sysctl_wmem = sysctl_sctp_wmem,
8339 .memory_pressure = &sctp_memory_pressure,
8340 .enter_memory_pressure = sctp_enter_memory_pressure,
8341 .memory_allocated = &sctp_memory_allocated,
8342 .sockets_allocated = &sctp_sockets_allocated,
8344 #endif /* IS_ENABLED(CONFIG_IPV6) */