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,
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 WRITE_ONCE(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 #define traverse_and_process() \
181 if (msg == prev_msg) \
183 list_for_each_entry(c, &msg->chunks, frag_list) { \
184 if ((clear && asoc->base.sk == c->skb->sk) || \
185 (!clear && asoc->base.sk != c->skb->sk)) \
191 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
193 void (*cb)(struct sctp_chunk *))
196 struct sctp_datamsg *msg, *prev_msg = NULL;
197 struct sctp_outq *q = &asoc->outqueue;
198 struct sctp_chunk *chunk, *c;
199 struct sctp_transport *t;
201 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
202 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
203 traverse_and_process();
205 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
206 traverse_and_process();
208 list_for_each_entry(chunk, &q->sacked, transmitted_list)
209 traverse_and_process();
211 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
212 traverse_and_process();
214 list_for_each_entry(chunk, &q->out_chunk_list, list)
215 traverse_and_process();
218 /* Verify that this is a valid address. */
219 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
224 /* Verify basic sockaddr. */
225 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
229 /* Is this a valid SCTP address? */
230 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
233 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
239 /* Look up the association by its id. If this is not a UDP-style
240 * socket, the ID field is always ignored.
242 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
244 struct sctp_association *asoc = NULL;
246 /* If this is not a UDP-style socket, assoc id should be ignored. */
247 if (!sctp_style(sk, UDP)) {
248 /* Return NULL if the socket state is not ESTABLISHED. It
249 * could be a TCP-style listening socket or a socket which
250 * hasn't yet called connect() to establish an association.
252 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
255 /* Get the first and the only association from the list. */
256 if (!list_empty(&sctp_sk(sk)->ep->asocs))
257 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
258 struct sctp_association, asocs);
262 /* Otherwise this is a UDP-style socket. */
263 if (!id || (id == (sctp_assoc_t)-1))
266 spin_lock_bh(&sctp_assocs_id_lock);
267 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
268 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
270 spin_unlock_bh(&sctp_assocs_id_lock);
275 /* Look up the transport from an address and an assoc id. If both address and
276 * id are specified, the associations matching the address and the id should be
279 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
280 struct sockaddr_storage *addr,
283 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
284 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
285 union sctp_addr *laddr = (union sctp_addr *)addr;
286 struct sctp_transport *transport;
288 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
291 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
298 id_asoc = sctp_id2assoc(sk, id);
299 if (id_asoc && (id_asoc != addr_asoc))
302 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
303 (union sctp_addr *)addr);
308 /* API 3.1.2 bind() - UDP Style Syntax
309 * The syntax of bind() is,
311 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
313 * sd - the socket descriptor returned by socket().
314 * addr - the address structure (struct sockaddr_in or struct
315 * sockaddr_in6 [RFC 2553]),
316 * addr_len - the size of the address structure.
318 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
324 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
327 /* Disallow binding twice. */
328 if (!sctp_sk(sk)->ep->base.bind_addr.port)
329 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
339 static long sctp_get_port_local(struct sock *, union sctp_addr *);
341 /* Verify this is a valid sockaddr. */
342 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
343 union sctp_addr *addr, int len)
347 /* Check minimum size. */
348 if (len < sizeof (struct sockaddr))
351 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
354 if (addr->sa.sa_family == AF_INET6) {
355 if (len < SIN6_LEN_RFC2133)
357 /* V4 mapped address are really of AF_INET family */
358 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
359 !opt->pf->af_supported(AF_INET, opt))
363 /* If we get this far, af is valid. */
364 af = sctp_get_af_specific(addr->sa.sa_family);
366 if (len < af->sockaddr_len)
372 static void sctp_auto_asconf_init(struct sctp_sock *sp)
374 struct net *net = sock_net(&sp->inet.sk);
376 if (net->sctp.default_auto_asconf) {
377 spin_lock_bh(&net->sctp.addr_wq_lock);
378 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
379 spin_unlock_bh(&net->sctp.addr_wq_lock);
380 sp->do_auto_asconf = 1;
384 /* Bind a local address either to an endpoint or to an association. */
385 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
387 struct net *net = sock_net(sk);
388 struct sctp_sock *sp = sctp_sk(sk);
389 struct sctp_endpoint *ep = sp->ep;
390 struct sctp_bind_addr *bp = &ep->base.bind_addr;
395 /* Common sockaddr verification. */
396 af = sctp_sockaddr_af(sp, addr, len);
398 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
399 __func__, sk, addr, len);
403 snum = ntohs(addr->v4.sin_port);
405 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
406 __func__, sk, &addr->sa, bp->port, snum, len);
408 /* PF specific bind() address verification. */
409 if (!sp->pf->bind_verify(sp, addr))
410 return -EADDRNOTAVAIL;
412 /* We must either be unbound, or bind to the same port.
413 * It's OK to allow 0 ports if we are already bound.
414 * We'll just inhert an already bound port in this case
419 else if (snum != bp->port) {
420 pr_debug("%s: new port %d doesn't match existing port "
421 "%d\n", __func__, snum, bp->port);
426 if (snum && snum < inet_prot_sock(net) &&
427 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
430 /* See if the address matches any of the addresses we may have
431 * already bound before checking against other endpoints.
433 if (sctp_bind_addr_match(bp, addr, sp))
436 /* Make sure we are allowed to bind here.
437 * The function sctp_get_port_local() does duplicate address
440 addr->v4.sin_port = htons(snum);
441 if ((ret = sctp_get_port_local(sk, addr))) {
445 /* Refresh ephemeral port. */
447 bp->port = inet_sk(sk)->inet_num;
448 sctp_auto_asconf_init(sp);
451 /* Add the address to the bind address list.
452 * Use GFP_ATOMIC since BHs will be disabled.
454 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
455 SCTP_ADDR_SRC, GFP_ATOMIC);
457 /* Copy back into socket for getsockname() use. */
459 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
460 sp->pf->to_sk_saddr(addr, sk);
466 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
468 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
469 * at any one time. If a sender, after sending an ASCONF chunk, decides
470 * it needs to transfer another ASCONF Chunk, it MUST wait until the
471 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
472 * subsequent ASCONF. Note this restriction binds each side, so at any
473 * time two ASCONF may be in-transit on any given association (one sent
474 * from each endpoint).
476 static int sctp_send_asconf(struct sctp_association *asoc,
477 struct sctp_chunk *chunk)
479 struct net *net = sock_net(asoc->base.sk);
482 /* If there is an outstanding ASCONF chunk, queue it for later
485 if (asoc->addip_last_asconf) {
486 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
490 /* Hold the chunk until an ASCONF_ACK is received. */
491 sctp_chunk_hold(chunk);
492 retval = sctp_primitive_ASCONF(net, asoc, chunk);
494 sctp_chunk_free(chunk);
496 asoc->addip_last_asconf = chunk;
502 /* Add a list of addresses as bind addresses to local endpoint or
505 * Basically run through each address specified in the addrs/addrcnt
506 * array/length pair, determine if it is IPv6 or IPv4 and call
507 * sctp_do_bind() on it.
509 * If any of them fails, then the operation will be reversed and the
510 * ones that were added will be removed.
512 * Only sctp_setsockopt_bindx() is supposed to call this function.
514 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
519 struct sockaddr *sa_addr;
522 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
526 for (cnt = 0; cnt < addrcnt; cnt++) {
527 /* The list may contain either IPv4 or IPv6 address;
528 * determine the address length for walking thru the list.
531 af = sctp_get_af_specific(sa_addr->sa_family);
537 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
540 addr_buf += af->sockaddr_len;
544 /* Failed. Cleanup the ones that have been added */
546 sctp_bindx_rem(sk, addrs, cnt);
554 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
555 * associations that are part of the endpoint indicating that a list of local
556 * addresses are added to the endpoint.
558 * If any of the addresses is already in the bind address list of the
559 * association, we do not send the chunk for that association. But it will not
560 * affect other associations.
562 * Only sctp_setsockopt_bindx() is supposed to call this function.
564 static int sctp_send_asconf_add_ip(struct sock *sk,
565 struct sockaddr *addrs,
568 struct net *net = sock_net(sk);
569 struct sctp_sock *sp;
570 struct sctp_endpoint *ep;
571 struct sctp_association *asoc;
572 struct sctp_bind_addr *bp;
573 struct sctp_chunk *chunk;
574 struct sctp_sockaddr_entry *laddr;
575 union sctp_addr *addr;
576 union sctp_addr saveaddr;
583 if (!net->sctp.addip_enable)
589 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
590 __func__, sk, addrs, addrcnt);
592 list_for_each_entry(asoc, &ep->asocs, asocs) {
593 if (!asoc->peer.asconf_capable)
596 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
599 if (!sctp_state(asoc, ESTABLISHED))
602 /* Check if any address in the packed array of addresses is
603 * in the bind address list of the association. If so,
604 * do not send the asconf chunk to its peer, but continue with
605 * other associations.
608 for (i = 0; i < addrcnt; i++) {
610 af = sctp_get_af_specific(addr->v4.sin_family);
616 if (sctp_assoc_lookup_laddr(asoc, addr))
619 addr_buf += af->sockaddr_len;
624 /* Use the first valid address in bind addr list of
625 * association as Address Parameter of ASCONF CHUNK.
627 bp = &asoc->base.bind_addr;
628 p = bp->address_list.next;
629 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
630 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
631 addrcnt, SCTP_PARAM_ADD_IP);
637 /* Add the new addresses to the bind address list with
638 * use_as_src set to 0.
641 for (i = 0; i < addrcnt; i++) {
643 af = sctp_get_af_specific(addr->v4.sin_family);
644 memcpy(&saveaddr, addr, af->sockaddr_len);
645 retval = sctp_add_bind_addr(bp, &saveaddr,
647 SCTP_ADDR_NEW, GFP_ATOMIC);
648 addr_buf += af->sockaddr_len;
650 if (asoc->src_out_of_asoc_ok) {
651 struct sctp_transport *trans;
653 list_for_each_entry(trans,
654 &asoc->peer.transport_addr_list, transports) {
655 /* Clear the source and route cache */
656 sctp_transport_dst_release(trans);
657 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
658 2*asoc->pathmtu, 4380));
659 trans->ssthresh = asoc->peer.i.a_rwnd;
660 trans->rto = asoc->rto_initial;
661 sctp_max_rto(asoc, trans);
662 trans->rtt = trans->srtt = trans->rttvar = 0;
663 sctp_transport_route(trans, NULL,
664 sctp_sk(asoc->base.sk));
667 retval = sctp_send_asconf(asoc, chunk);
674 /* Remove a list of addresses from bind addresses list. Do not remove the
677 * Basically run through each address specified in the addrs/addrcnt
678 * array/length pair, determine if it is IPv6 or IPv4 and call
679 * sctp_del_bind() on it.
681 * If any of them fails, then the operation will be reversed and the
682 * ones that were removed will be added back.
684 * At least one address has to be left; if only one address is
685 * available, the operation will return -EBUSY.
687 * Only sctp_setsockopt_bindx() is supposed to call this function.
689 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
691 struct sctp_sock *sp = sctp_sk(sk);
692 struct sctp_endpoint *ep = sp->ep;
694 struct sctp_bind_addr *bp = &ep->base.bind_addr;
697 union sctp_addr *sa_addr;
700 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
701 __func__, sk, addrs, addrcnt);
704 for (cnt = 0; cnt < addrcnt; cnt++) {
705 /* If the bind address list is empty or if there is only one
706 * bind address, there is nothing more to be removed (we need
707 * at least one address here).
709 if (list_empty(&bp->address_list) ||
710 (sctp_list_single_entry(&bp->address_list))) {
716 af = sctp_get_af_specific(sa_addr->sa.sa_family);
722 if (!af->addr_valid(sa_addr, sp, NULL)) {
723 retval = -EADDRNOTAVAIL;
727 if (sa_addr->v4.sin_port &&
728 sa_addr->v4.sin_port != htons(bp->port)) {
733 if (!sa_addr->v4.sin_port)
734 sa_addr->v4.sin_port = htons(bp->port);
736 /* FIXME - There is probably a need to check if sk->sk_saddr and
737 * sk->sk_rcv_addr are currently set to one of the addresses to
738 * be removed. This is something which needs to be looked into
739 * when we are fixing the outstanding issues with multi-homing
740 * socket routing and failover schemes. Refer to comments in
741 * sctp_do_bind(). -daisy
743 retval = sctp_del_bind_addr(bp, sa_addr);
745 addr_buf += af->sockaddr_len;
748 /* Failed. Add the ones that has been removed back */
750 sctp_bindx_add(sk, addrs, cnt);
758 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
759 * the associations that are part of the endpoint indicating that a list of
760 * local addresses are removed from the endpoint.
762 * If any of the addresses is already in the bind address list of the
763 * association, we do not send the chunk for that association. But it will not
764 * affect other associations.
766 * Only sctp_setsockopt_bindx() is supposed to call this function.
768 static int sctp_send_asconf_del_ip(struct sock *sk,
769 struct sockaddr *addrs,
772 struct net *net = sock_net(sk);
773 struct sctp_sock *sp;
774 struct sctp_endpoint *ep;
775 struct sctp_association *asoc;
776 struct sctp_transport *transport;
777 struct sctp_bind_addr *bp;
778 struct sctp_chunk *chunk;
779 union sctp_addr *laddr;
782 struct sctp_sockaddr_entry *saddr;
788 if (!net->sctp.addip_enable)
794 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
795 __func__, sk, addrs, addrcnt);
797 list_for_each_entry(asoc, &ep->asocs, asocs) {
799 if (!asoc->peer.asconf_capable)
802 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
805 if (!sctp_state(asoc, ESTABLISHED))
808 /* Check if any address in the packed array of addresses is
809 * not present in the bind address list of the association.
810 * If so, do not send the asconf chunk to its peer, but
811 * continue with other associations.
814 for (i = 0; i < addrcnt; i++) {
816 af = sctp_get_af_specific(laddr->v4.sin_family);
822 if (!sctp_assoc_lookup_laddr(asoc, laddr))
825 addr_buf += af->sockaddr_len;
830 /* Find one address in the association's bind address list
831 * that is not in the packed array of addresses. This is to
832 * make sure that we do not delete all the addresses in the
835 bp = &asoc->base.bind_addr;
836 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
838 if ((laddr == NULL) && (addrcnt == 1)) {
839 if (asoc->asconf_addr_del_pending)
841 asoc->asconf_addr_del_pending =
842 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
843 if (asoc->asconf_addr_del_pending == NULL) {
847 asoc->asconf_addr_del_pending->sa.sa_family =
849 asoc->asconf_addr_del_pending->v4.sin_port =
851 if (addrs->sa_family == AF_INET) {
852 struct sockaddr_in *sin;
854 sin = (struct sockaddr_in *)addrs;
855 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
856 } else if (addrs->sa_family == AF_INET6) {
857 struct sockaddr_in6 *sin6;
859 sin6 = (struct sockaddr_in6 *)addrs;
860 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
863 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
864 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
865 asoc->asconf_addr_del_pending);
867 asoc->src_out_of_asoc_ok = 1;
875 /* We do not need RCU protection throughout this loop
876 * because this is done under a socket lock from the
879 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
887 /* Reset use_as_src flag for the addresses in the bind address
888 * list that are to be deleted.
891 for (i = 0; i < addrcnt; i++) {
893 af = sctp_get_af_specific(laddr->v4.sin_family);
894 list_for_each_entry(saddr, &bp->address_list, list) {
895 if (sctp_cmp_addr_exact(&saddr->a, laddr))
896 saddr->state = SCTP_ADDR_DEL;
898 addr_buf += af->sockaddr_len;
901 /* Update the route and saddr entries for all the transports
902 * as some of the addresses in the bind address list are
903 * about to be deleted and cannot be used as source addresses.
905 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
907 sctp_transport_dst_release(transport);
908 sctp_transport_route(transport, NULL,
909 sctp_sk(asoc->base.sk));
913 /* We don't need to transmit ASCONF */
915 retval = sctp_send_asconf(asoc, chunk);
921 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
922 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
924 struct sock *sk = sctp_opt2sk(sp);
925 union sctp_addr *addr;
928 /* It is safe to write port space in caller. */
930 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
931 af = sctp_get_af_specific(addr->sa.sa_family);
934 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
937 if (addrw->state == SCTP_ADDR_NEW)
938 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
940 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
943 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
946 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
949 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
950 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
953 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
954 * Section 3.1.2 for this usage.
956 * addrs is a pointer to an array of one or more socket addresses. Each
957 * address is contained in its appropriate structure (i.e. struct
958 * sockaddr_in or struct sockaddr_in6) the family of the address type
959 * must be used to distinguish the address length (note that this
960 * representation is termed a "packed array" of addresses). The caller
961 * specifies the number of addresses in the array with addrcnt.
963 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
964 * -1, and sets errno to the appropriate error code.
966 * For SCTP, the port given in each socket address must be the same, or
967 * sctp_bindx() will fail, setting errno to EINVAL.
969 * The flags parameter is formed from the bitwise OR of zero or more of
970 * the following currently defined flags:
972 * SCTP_BINDX_ADD_ADDR
974 * SCTP_BINDX_REM_ADDR
976 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
977 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
978 * addresses from the association. The two flags are mutually exclusive;
979 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
980 * not remove all addresses from an association; sctp_bindx() will
981 * reject such an attempt with EINVAL.
983 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
984 * additional addresses with an endpoint after calling bind(). Or use
985 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
986 * socket is associated with so that no new association accepted will be
987 * associated with those addresses. If the endpoint supports dynamic
988 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
989 * endpoint to send the appropriate message to the peer to change the
990 * peers address lists.
992 * Adding and removing addresses from a connected association is
993 * optional functionality. Implementations that do not support this
994 * functionality should return EOPNOTSUPP.
996 * Basically do nothing but copying the addresses from user to kernel
997 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
998 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
1001 * We don't use copy_from_user() for optimization: we first do the
1002 * sanity checks (buffer size -fast- and access check-healthy
1003 * pointer); if all of those succeed, then we can alloc the memory
1004 * (expensive operation) needed to copy the data to kernel. Then we do
1005 * the copying without checking the user space area
1006 * (__copy_from_user()).
1008 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1011 * sk The sk of the socket
1012 * addrs The pointer to the addresses in user land
1013 * addrssize Size of the addrs buffer
1014 * op Operation to perform (add or remove, see the flags of
1017 * Returns 0 if ok, <0 errno code on error.
1019 static int sctp_setsockopt_bindx(struct sock *sk,
1020 struct sockaddr __user *addrs,
1021 int addrs_size, int op)
1023 struct sockaddr *kaddrs;
1027 struct sockaddr *sa_addr;
1031 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1032 __func__, sk, addrs, addrs_size, op);
1034 if (unlikely(addrs_size <= 0))
1037 /* Check the user passed a healthy pointer. */
1038 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1041 /* Alloc space for the address array in kernel memory. */
1042 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
1043 if (unlikely(!kaddrs))
1046 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1051 /* Walk through the addrs buffer and count the number of addresses. */
1053 while (walk_size < addrs_size) {
1054 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1060 af = sctp_get_af_specific(sa_addr->sa_family);
1062 /* If the address family is not supported or if this address
1063 * causes the address buffer to overflow return EINVAL.
1065 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1070 addr_buf += af->sockaddr_len;
1071 walk_size += af->sockaddr_len;
1076 case SCTP_BINDX_ADD_ADDR:
1077 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1080 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1083 case SCTP_BINDX_REM_ADDR:
1084 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1087 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1101 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1103 * Common routine for handling connect() and sctp_connectx().
1104 * Connect will come in with just a single address.
1106 static int __sctp_connect(struct sock *sk,
1107 struct sockaddr *kaddrs,
1108 int addrs_size, int flags,
1109 sctp_assoc_t *assoc_id)
1111 struct net *net = sock_net(sk);
1112 struct sctp_sock *sp;
1113 struct sctp_endpoint *ep;
1114 struct sctp_association *asoc = NULL;
1115 struct sctp_association *asoc2;
1116 struct sctp_transport *transport;
1118 enum sctp_scope scope;
1123 union sctp_addr *sa_addr = NULL;
1125 unsigned short port;
1130 /* connect() cannot be done on a socket that is already in ESTABLISHED
1131 * state - UDP-style peeled off socket or a TCP-style socket that
1132 * is already connected.
1133 * It cannot be done even on a TCP-style listening socket.
1135 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1136 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1141 /* Walk through the addrs buffer and count the number of addresses. */
1143 while (walk_size < addrs_size) {
1146 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1152 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1154 /* If the address family is not supported or if this address
1155 * causes the address buffer to overflow return EINVAL.
1157 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1162 port = ntohs(sa_addr->v4.sin_port);
1164 /* Save current address so we can work with it */
1165 memcpy(&to, sa_addr, af->sockaddr_len);
1167 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1171 /* Make sure the destination port is correctly set
1174 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1179 /* Check if there already is a matching association on the
1180 * endpoint (other than the one created here).
1182 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1183 if (asoc2 && asoc2 != asoc) {
1184 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1191 /* If we could not find a matching association on the endpoint,
1192 * make sure that there is no peeled-off association matching
1193 * the peer address even on another socket.
1195 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1196 err = -EADDRNOTAVAIL;
1201 /* If a bind() or sctp_bindx() is not called prior to
1202 * an sctp_connectx() call, the system picks an
1203 * ephemeral port and will choose an address set
1204 * equivalent to binding with a wildcard address.
1206 if (!ep->base.bind_addr.port) {
1207 if (sctp_autobind(sk)) {
1213 * If an unprivileged user inherits a 1-many
1214 * style socket with open associations on a
1215 * privileged port, it MAY be permitted to
1216 * accept new associations, but it SHOULD NOT
1217 * be permitted to open new associations.
1219 if (ep->base.bind_addr.port <
1220 inet_prot_sock(net) &&
1221 !ns_capable(net->user_ns,
1222 CAP_NET_BIND_SERVICE)) {
1228 scope = sctp_scope(&to);
1229 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1235 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1243 /* Prime the peer's transport structures. */
1244 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1252 addr_buf += af->sockaddr_len;
1253 walk_size += af->sockaddr_len;
1256 /* In case the user of sctp_connectx() wants an association
1257 * id back, assign one now.
1260 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1265 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1270 /* Initialize sk's dport and daddr for getpeername() */
1271 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1272 sp->pf->to_sk_daddr(sa_addr, sk);
1275 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1278 *assoc_id = asoc->assoc_id;
1279 err = sctp_wait_for_connect(asoc, &timeo);
1280 /* Note: the asoc may be freed after the return of
1281 * sctp_wait_for_connect.
1284 /* Don't free association on exit. */
1288 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1289 __func__, asoc, kaddrs, err);
1292 /* sctp_primitive_ASSOCIATE may have added this association
1293 * To the hash table, try to unhash it, just in case, its a noop
1294 * if it wasn't hashed so we're safe
1296 sctp_association_free(asoc);
1301 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1304 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1305 * sctp_assoc_t *asoc);
1307 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1308 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1309 * or IPv6 addresses.
1311 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1312 * Section 3.1.2 for this usage.
1314 * addrs is a pointer to an array of one or more socket addresses. Each
1315 * address is contained in its appropriate structure (i.e. struct
1316 * sockaddr_in or struct sockaddr_in6) the family of the address type
1317 * must be used to distengish the address length (note that this
1318 * representation is termed a "packed array" of addresses). The caller
1319 * specifies the number of addresses in the array with addrcnt.
1321 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1322 * the association id of the new association. On failure, sctp_connectx()
1323 * returns -1, and sets errno to the appropriate error code. The assoc_id
1324 * is not touched by the kernel.
1326 * For SCTP, the port given in each socket address must be the same, or
1327 * sctp_connectx() will fail, setting errno to EINVAL.
1329 * An application can use sctp_connectx to initiate an association with
1330 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1331 * allows a caller to specify multiple addresses at which a peer can be
1332 * reached. The way the SCTP stack uses the list of addresses to set up
1333 * the association is implementation dependent. This function only
1334 * specifies that the stack will try to make use of all the addresses in
1335 * the list when needed.
1337 * Note that the list of addresses passed in is only used for setting up
1338 * the association. It does not necessarily equal the set of addresses
1339 * the peer uses for the resulting association. If the caller wants to
1340 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1341 * retrieve them after the association has been set up.
1343 * Basically do nothing but copying the addresses from user to kernel
1344 * land and invoking either sctp_connectx(). This is used for tunneling
1345 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1347 * We don't use copy_from_user() for optimization: we first do the
1348 * sanity checks (buffer size -fast- and access check-healthy
1349 * pointer); if all of those succeed, then we can alloc the memory
1350 * (expensive operation) needed to copy the data to kernel. Then we do
1351 * the copying without checking the user space area
1352 * (__copy_from_user()).
1354 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1357 * sk The sk of the socket
1358 * addrs The pointer to the addresses in user land
1359 * addrssize Size of the addrs buffer
1361 * Returns >=0 if ok, <0 errno code on error.
1363 static int __sctp_setsockopt_connectx(struct sock *sk,
1364 struct sockaddr __user *addrs,
1366 sctp_assoc_t *assoc_id)
1368 struct sockaddr *kaddrs;
1369 gfp_t gfp = GFP_KERNEL;
1370 int err = 0, flags = 0;
1372 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1373 __func__, sk, addrs, addrs_size);
1375 if (unlikely(addrs_size <= 0))
1378 /* Check the user passed a healthy pointer. */
1379 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1382 /* Alloc space for the address array in kernel memory. */
1383 if (sk->sk_socket->file)
1384 gfp = GFP_USER | __GFP_NOWARN;
1385 kaddrs = kmalloc(addrs_size, gfp);
1386 if (unlikely(!kaddrs))
1389 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1394 /* in-kernel sockets don't generally have a file allocated to them
1395 * if all they do is call sock_create_kern().
1397 if (sk->sk_socket->file)
1398 flags = sk->sk_socket->file->f_flags;
1400 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1408 * This is an older interface. It's kept for backward compatibility
1409 * to the option that doesn't provide association id.
1411 static int sctp_setsockopt_connectx_old(struct sock *sk,
1412 struct sockaddr __user *addrs,
1415 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1419 * New interface for the API. The since the API is done with a socket
1420 * option, to make it simple we feed back the association id is as a return
1421 * indication to the call. Error is always negative and association id is
1424 static int sctp_setsockopt_connectx(struct sock *sk,
1425 struct sockaddr __user *addrs,
1428 sctp_assoc_t assoc_id = 0;
1431 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1440 * New (hopefully final) interface for the API.
1441 * We use the sctp_getaddrs_old structure so that use-space library
1442 * can avoid any unnecessary allocations. The only different part
1443 * is that we store the actual length of the address buffer into the
1444 * addrs_num structure member. That way we can re-use the existing
1447 #ifdef CONFIG_COMPAT
1448 struct compat_sctp_getaddrs_old {
1449 sctp_assoc_t assoc_id;
1451 compat_uptr_t addrs; /* struct sockaddr * */
1455 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1456 char __user *optval,
1459 struct sctp_getaddrs_old param;
1460 sctp_assoc_t assoc_id = 0;
1463 #ifdef CONFIG_COMPAT
1464 if (in_compat_syscall()) {
1465 struct compat_sctp_getaddrs_old param32;
1467 if (len < sizeof(param32))
1469 if (copy_from_user(¶m32, optval, sizeof(param32)))
1472 param.assoc_id = param32.assoc_id;
1473 param.addr_num = param32.addr_num;
1474 param.addrs = compat_ptr(param32.addrs);
1478 if (len < sizeof(param))
1480 if (copy_from_user(¶m, optval, sizeof(param)))
1484 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1485 param.addrs, param.addr_num,
1487 if (err == 0 || err == -EINPROGRESS) {
1488 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1490 if (put_user(sizeof(assoc_id), optlen))
1497 /* API 3.1.4 close() - UDP Style Syntax
1498 * Applications use close() to perform graceful shutdown (as described in
1499 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1500 * by a UDP-style socket.
1504 * ret = close(int sd);
1506 * sd - the socket descriptor of the associations to be closed.
1508 * To gracefully shutdown a specific association represented by the
1509 * UDP-style socket, an application should use the sendmsg() call,
1510 * passing no user data, but including the appropriate flag in the
1511 * ancillary data (see Section xxxx).
1513 * If sd in the close() call is a branched-off socket representing only
1514 * one association, the shutdown is performed on that association only.
1516 * 4.1.6 close() - TCP Style Syntax
1518 * Applications use close() to gracefully close down an association.
1522 * int close(int sd);
1524 * sd - the socket descriptor of the association to be closed.
1526 * After an application calls close() on a socket descriptor, no further
1527 * socket operations will succeed on that descriptor.
1529 * API 7.1.4 SO_LINGER
1531 * An application using the TCP-style socket can use this option to
1532 * perform the SCTP ABORT primitive. The linger option structure is:
1535 * int l_onoff; // option on/off
1536 * int l_linger; // linger time
1539 * To enable the option, set l_onoff to 1. If the l_linger value is set
1540 * to 0, calling close() is the same as the ABORT primitive. If the
1541 * value is set to a negative value, the setsockopt() call will return
1542 * an error. If the value is set to a positive value linger_time, the
1543 * close() can be blocked for at most linger_time ms. If the graceful
1544 * shutdown phase does not finish during this period, close() will
1545 * return but the graceful shutdown phase continues in the system.
1547 static void sctp_close(struct sock *sk, long timeout)
1549 struct net *net = sock_net(sk);
1550 struct sctp_endpoint *ep;
1551 struct sctp_association *asoc;
1552 struct list_head *pos, *temp;
1553 unsigned int data_was_unread;
1555 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1557 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1558 sk->sk_shutdown = SHUTDOWN_MASK;
1559 sk->sk_state = SCTP_SS_CLOSING;
1561 ep = sctp_sk(sk)->ep;
1563 /* Clean up any skbs sitting on the receive queue. */
1564 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1565 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1567 /* Walk all associations on an endpoint. */
1568 list_for_each_safe(pos, temp, &ep->asocs) {
1569 asoc = list_entry(pos, struct sctp_association, asocs);
1571 if (sctp_style(sk, TCP)) {
1572 /* A closed association can still be in the list if
1573 * it belongs to a TCP-style listening socket that is
1574 * not yet accepted. If so, free it. If not, send an
1575 * ABORT or SHUTDOWN based on the linger options.
1577 if (sctp_state(asoc, CLOSED)) {
1578 sctp_association_free(asoc);
1583 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1584 !skb_queue_empty(&asoc->ulpq.reasm) ||
1585 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1586 struct sctp_chunk *chunk;
1588 chunk = sctp_make_abort_user(asoc, NULL, 0);
1589 sctp_primitive_ABORT(net, asoc, chunk);
1591 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1594 /* On a TCP-style socket, block for at most linger_time if set. */
1595 if (sctp_style(sk, TCP) && timeout)
1596 sctp_wait_for_close(sk, timeout);
1598 /* This will run the backlog queue. */
1601 /* Supposedly, no process has access to the socket, but
1602 * the net layers still may.
1603 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1604 * held and that should be grabbed before socket lock.
1606 spin_lock_bh(&net->sctp.addr_wq_lock);
1607 bh_lock_sock_nested(sk);
1609 /* Hold the sock, since sk_common_release() will put sock_put()
1610 * and we have just a little more cleanup.
1613 sk_common_release(sk);
1616 spin_unlock_bh(&net->sctp.addr_wq_lock);
1620 SCTP_DBG_OBJCNT_DEC(sock);
1623 /* Handle EPIPE error. */
1624 static int sctp_error(struct sock *sk, int flags, int err)
1627 err = sock_error(sk) ? : -EPIPE;
1628 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1629 send_sig(SIGPIPE, current, 0);
1633 /* API 3.1.3 sendmsg() - UDP Style Syntax
1635 * An application uses sendmsg() and recvmsg() calls to transmit data to
1636 * and receive data from its peer.
1638 * ssize_t sendmsg(int socket, const struct msghdr *message,
1641 * socket - the socket descriptor of the endpoint.
1642 * message - pointer to the msghdr structure which contains a single
1643 * user message and possibly some ancillary data.
1645 * See Section 5 for complete description of the data
1648 * flags - flags sent or received with the user message, see Section
1649 * 5 for complete description of the flags.
1651 * Note: This function could use a rewrite especially when explicit
1652 * connect support comes in.
1654 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1656 static int sctp_msghdr_parse(const struct msghdr *msg,
1657 struct sctp_cmsgs *cmsgs);
1659 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1661 struct net *net = sock_net(sk);
1662 struct sctp_sock *sp;
1663 struct sctp_endpoint *ep;
1664 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1665 struct sctp_transport *transport, *chunk_tp;
1666 struct sctp_chunk *chunk;
1668 struct sockaddr *msg_name = NULL;
1669 struct sctp_sndrcvinfo default_sinfo;
1670 struct sctp_sndrcvinfo *sinfo;
1671 struct sctp_initmsg *sinit;
1672 sctp_assoc_t associd = 0;
1673 struct sctp_cmsgs cmsgs = { NULL };
1674 enum sctp_scope scope;
1675 bool fill_sinfo_ttl = false, wait_connect = false;
1676 struct sctp_datamsg *datamsg;
1677 int msg_flags = msg->msg_flags;
1678 __u16 sinfo_flags = 0;
1686 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1689 /* We cannot send a message over a TCP-style listening socket. */
1690 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1695 /* Parse out the SCTP CMSGs. */
1696 err = sctp_msghdr_parse(msg, &cmsgs);
1698 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1702 /* Fetch the destination address for this packet. This
1703 * address only selects the association--it is not necessarily
1704 * the address we will send to.
1705 * For a peeled-off socket, msg_name is ignored.
1707 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1708 int msg_namelen = msg->msg_namelen;
1710 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1715 if (msg_namelen > sizeof(to))
1716 msg_namelen = sizeof(to);
1717 memcpy(&to, msg->msg_name, msg_namelen);
1718 msg_name = msg->msg_name;
1722 if (cmsgs.sinfo != NULL) {
1723 memset(&default_sinfo, 0, sizeof(default_sinfo));
1724 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1725 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1726 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1727 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1728 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1730 sinfo = &default_sinfo;
1731 fill_sinfo_ttl = true;
1733 sinfo = cmsgs.srinfo;
1735 /* Did the user specify SNDINFO/SNDRCVINFO? */
1737 sinfo_flags = sinfo->sinfo_flags;
1738 associd = sinfo->sinfo_assoc_id;
1741 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1742 msg_len, sinfo_flags);
1744 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1745 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1750 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1751 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1752 * If SCTP_ABORT is set, the message length could be non zero with
1753 * the msg_iov set to the user abort reason.
1755 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1756 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1761 /* If SCTP_ADDR_OVER is set, there must be an address
1762 * specified in msg_name.
1764 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1771 pr_debug("%s: about to look up association\n", __func__);
1775 /* If a msg_name has been specified, assume this is to be used. */
1777 /* Look for a matching association on the endpoint. */
1778 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1780 /* If we could not find a matching association on the
1781 * endpoint, make sure that it is not a TCP-style
1782 * socket that already has an association or there is
1783 * no peeled-off association on another socket.
1786 ((sctp_style(sk, TCP) &&
1787 (sctp_sstate(sk, ESTABLISHED) ||
1788 sctp_sstate(sk, CLOSING))) ||
1789 sctp_endpoint_is_peeled_off(ep, &to))) {
1790 err = -EADDRNOTAVAIL;
1794 asoc = sctp_id2assoc(sk, associd);
1802 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1804 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1805 * socket that has an association in CLOSED state. This can
1806 * happen when an accepted socket has an association that is
1809 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1814 if (sinfo_flags & SCTP_EOF) {
1815 pr_debug("%s: shutting down association:%p\n",
1818 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1822 if (sinfo_flags & SCTP_ABORT) {
1824 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1830 pr_debug("%s: aborting association:%p\n",
1833 sctp_primitive_ABORT(net, asoc, chunk);
1839 /* Do we need to create the association? */
1841 pr_debug("%s: there is no association yet\n", __func__);
1843 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1848 /* Check for invalid stream against the stream counts,
1849 * either the default or the user specified stream counts.
1852 if (!sinit || !sinit->sinit_num_ostreams) {
1853 /* Check against the defaults. */
1854 if (sinfo->sinfo_stream >=
1855 sp->initmsg.sinit_num_ostreams) {
1860 /* Check against the requested. */
1861 if (sinfo->sinfo_stream >=
1862 sinit->sinit_num_ostreams) {
1870 * API 3.1.2 bind() - UDP Style Syntax
1871 * If a bind() or sctp_bindx() is not called prior to a
1872 * sendmsg() call that initiates a new association, the
1873 * system picks an ephemeral port and will choose an address
1874 * set equivalent to binding with a wildcard address.
1876 if (!ep->base.bind_addr.port) {
1877 if (sctp_autobind(sk)) {
1883 * If an unprivileged user inherits a one-to-many
1884 * style socket with open associations on a privileged
1885 * port, it MAY be permitted to accept new associations,
1886 * but it SHOULD NOT be permitted to open new
1889 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1890 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1896 scope = sctp_scope(&to);
1897 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1903 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1909 /* If the SCTP_INIT ancillary data is specified, set all
1910 * the association init values accordingly.
1913 if (sinit->sinit_num_ostreams) {
1914 __u16 outcnt = sinit->sinit_num_ostreams;
1916 asoc->c.sinit_num_ostreams = outcnt;
1917 /* outcnt has been changed, so re-init stream */
1918 err = sctp_stream_init(&asoc->stream, outcnt, 0,
1923 if (sinit->sinit_max_instreams) {
1924 asoc->c.sinit_max_instreams =
1925 sinit->sinit_max_instreams;
1927 if (sinit->sinit_max_attempts) {
1928 asoc->max_init_attempts
1929 = sinit->sinit_max_attempts;
1931 if (sinit->sinit_max_init_timeo) {
1932 asoc->max_init_timeo =
1933 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1937 /* Prime the peer's transport structures. */
1938 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1945 /* ASSERT: we have a valid association at this point. */
1946 pr_debug("%s: we have a valid association\n", __func__);
1949 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1950 * one with some defaults.
1952 memset(&default_sinfo, 0, sizeof(default_sinfo));
1953 default_sinfo.sinfo_stream = asoc->default_stream;
1954 default_sinfo.sinfo_flags = asoc->default_flags;
1955 default_sinfo.sinfo_ppid = asoc->default_ppid;
1956 default_sinfo.sinfo_context = asoc->default_context;
1957 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1958 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1960 sinfo = &default_sinfo;
1961 } else if (fill_sinfo_ttl) {
1962 /* In case SNDINFO was specified, we still need to fill
1963 * it with a default ttl from the assoc here.
1965 sinfo->sinfo_timetolive = asoc->default_timetolive;
1968 /* API 7.1.7, the sndbuf size per association bounds the
1969 * maximum size of data that can be sent in a single send call.
1971 if (msg_len > sk->sk_sndbuf) {
1976 if (asoc->pmtu_pending)
1977 sctp_assoc_pending_pmtu(asoc);
1979 /* If fragmentation is disabled and the message length exceeds the
1980 * association fragmentation point, return EMSGSIZE. The I-D
1981 * does not specify what this error is, but this looks like
1984 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1989 /* Check for invalid stream. */
1990 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1995 if (sctp_wspace(asoc) < msg_len)
1996 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1998 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1999 if (!sctp_wspace(asoc)) {
2000 /* sk can be changed by peel off when waiting for buf. */
2001 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
2003 if (err == -ESRCH) {
2004 /* asoc is already dead. */
2012 /* If an address is passed with the sendto/sendmsg call, it is used
2013 * to override the primary destination address in the TCP model, or
2014 * when SCTP_ADDR_OVER flag is set in the UDP model.
2016 if ((sctp_style(sk, TCP) && msg_name) ||
2017 (sinfo_flags & SCTP_ADDR_OVER)) {
2018 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
2026 /* Auto-connect, if we aren't connected already. */
2027 if (sctp_state(asoc, CLOSED)) {
2028 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
2032 wait_connect = true;
2033 pr_debug("%s: we associated primitively\n", __func__);
2036 /* Break the message into multiple chunks of maximum size. */
2037 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
2038 if (IS_ERR(datamsg)) {
2039 err = PTR_ERR(datamsg);
2042 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
2044 /* Now send the (possibly) fragmented message. */
2045 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2046 sctp_chunk_hold(chunk);
2048 /* Do accounting for the write space. */
2049 sctp_set_owner_w(chunk);
2051 chunk->transport = chunk_tp;
2054 /* Send it to the lower layers. Note: all chunks
2055 * must either fail or succeed. The lower layer
2056 * works that way today. Keep it that way or this
2059 err = sctp_primitive_SEND(net, asoc, datamsg);
2060 /* Did the lower layer accept the chunk? */
2062 sctp_datamsg_free(datamsg);
2066 pr_debug("%s: we sent primitively\n", __func__);
2068 sctp_datamsg_put(datamsg);
2071 if (unlikely(wait_connect)) {
2072 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
2073 sctp_wait_for_connect(asoc, &timeo);
2076 /* If we are already past ASSOCIATE, the lower
2077 * layers are responsible for association cleanup.
2083 sctp_association_free(asoc);
2088 return sctp_error(sk, msg_flags, err);
2095 err = sock_error(sk);
2105 /* This is an extended version of skb_pull() that removes the data from the
2106 * start of a skb even when data is spread across the list of skb's in the
2107 * frag_list. len specifies the total amount of data that needs to be removed.
2108 * when 'len' bytes could be removed from the skb, it returns 0.
2109 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2110 * could not be removed.
2112 static int sctp_skb_pull(struct sk_buff *skb, int len)
2114 struct sk_buff *list;
2115 int skb_len = skb_headlen(skb);
2118 if (len <= skb_len) {
2119 __skb_pull(skb, len);
2123 __skb_pull(skb, skb_len);
2125 skb_walk_frags(skb, list) {
2126 rlen = sctp_skb_pull(list, len);
2127 skb->len -= (len-rlen);
2128 skb->data_len -= (len-rlen);
2139 /* API 3.1.3 recvmsg() - UDP Style Syntax
2141 * ssize_t recvmsg(int socket, struct msghdr *message,
2144 * socket - the socket descriptor of the endpoint.
2145 * message - pointer to the msghdr structure which contains a single
2146 * user message and possibly some ancillary data.
2148 * See Section 5 for complete description of the data
2151 * flags - flags sent or received with the user message, see Section
2152 * 5 for complete description of the flags.
2154 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2155 int noblock, int flags, int *addr_len)
2157 struct sctp_ulpevent *event = NULL;
2158 struct sctp_sock *sp = sctp_sk(sk);
2159 struct sk_buff *skb, *head_skb;
2164 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2165 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2170 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2171 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2176 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2180 /* Get the total length of the skb including any skb's in the
2189 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2191 event = sctp_skb2event(skb);
2196 if (event->chunk && event->chunk->head_skb)
2197 head_skb = event->chunk->head_skb;
2200 sock_recv_ts_and_drops(msg, sk, head_skb);
2201 if (sctp_ulpevent_is_notification(event)) {
2202 msg->msg_flags |= MSG_NOTIFICATION;
2203 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2205 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2208 /* Check if we allow SCTP_NXTINFO. */
2209 if (sp->recvnxtinfo)
2210 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2211 /* Check if we allow SCTP_RCVINFO. */
2212 if (sp->recvrcvinfo)
2213 sctp_ulpevent_read_rcvinfo(event, msg);
2214 /* Check if we allow SCTP_SNDRCVINFO. */
2215 if (sp->subscribe.sctp_data_io_event)
2216 sctp_ulpevent_read_sndrcvinfo(event, msg);
2220 /* If skb's length exceeds the user's buffer, update the skb and
2221 * push it back to the receive_queue so that the next call to
2222 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2224 if (skb_len > copied) {
2225 msg->msg_flags &= ~MSG_EOR;
2226 if (flags & MSG_PEEK)
2228 sctp_skb_pull(skb, copied);
2229 skb_queue_head(&sk->sk_receive_queue, skb);
2231 /* When only partial message is copied to the user, increase
2232 * rwnd by that amount. If all the data in the skb is read,
2233 * rwnd is updated when the event is freed.
2235 if (!sctp_ulpevent_is_notification(event))
2236 sctp_assoc_rwnd_increase(event->asoc, copied);
2238 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2239 (event->msg_flags & MSG_EOR))
2240 msg->msg_flags |= MSG_EOR;
2242 msg->msg_flags &= ~MSG_EOR;
2245 if (flags & MSG_PEEK) {
2246 /* Release the skb reference acquired after peeking the skb in
2247 * sctp_skb_recv_datagram().
2251 /* Free the event which includes releasing the reference to
2252 * the owner of the skb, freeing the skb and updating the
2255 sctp_ulpevent_free(event);
2262 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2264 * This option is a on/off flag. If enabled no SCTP message
2265 * fragmentation will be performed. Instead if a message being sent
2266 * exceeds the current PMTU size, the message will NOT be sent and
2267 * instead a error will be indicated to the user.
2269 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2270 char __user *optval,
2271 unsigned int optlen)
2275 if (optlen < sizeof(int))
2278 if (get_user(val, (int __user *)optval))
2281 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2286 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2287 unsigned int optlen)
2289 struct sctp_association *asoc;
2290 struct sctp_ulpevent *event;
2292 if (optlen > sizeof(struct sctp_event_subscribe))
2294 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2297 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2298 * if there is no data to be sent or retransmit, the stack will
2299 * immediately send up this notification.
2301 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2302 &sctp_sk(sk)->subscribe)) {
2303 asoc = sctp_id2assoc(sk, 0);
2305 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2306 event = sctp_ulpevent_make_sender_dry_event(asoc,
2311 sctp_ulpq_tail_event(&asoc->ulpq, event);
2318 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2320 * This socket option is applicable to the UDP-style socket only. When
2321 * set it will cause associations that are idle for more than the
2322 * specified number of seconds to automatically close. An association
2323 * being idle is defined an association that has NOT sent or received
2324 * user data. The special value of '0' indicates that no automatic
2325 * close of any associations should be performed. The option expects an
2326 * integer defining the number of seconds of idle time before an
2327 * association is closed.
2329 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2330 unsigned int optlen)
2332 struct sctp_sock *sp = sctp_sk(sk);
2333 struct net *net = sock_net(sk);
2335 /* Applicable to UDP-style socket only */
2336 if (sctp_style(sk, TCP))
2338 if (optlen != sizeof(int))
2340 if (copy_from_user(&sp->autoclose, optval, optlen))
2343 if (sp->autoclose > net->sctp.max_autoclose)
2344 sp->autoclose = net->sctp.max_autoclose;
2349 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2351 * Applications can enable or disable heartbeats for any peer address of
2352 * an association, modify an address's heartbeat interval, force a
2353 * heartbeat to be sent immediately, and adjust the address's maximum
2354 * number of retransmissions sent before an address is considered
2355 * unreachable. The following structure is used to access and modify an
2356 * address's parameters:
2358 * struct sctp_paddrparams {
2359 * sctp_assoc_t spp_assoc_id;
2360 * struct sockaddr_storage spp_address;
2361 * uint32_t spp_hbinterval;
2362 * uint16_t spp_pathmaxrxt;
2363 * uint32_t spp_pathmtu;
2364 * uint32_t spp_sackdelay;
2365 * uint32_t spp_flags;
2368 * spp_assoc_id - (one-to-many style socket) This is filled in the
2369 * application, and identifies the association for
2371 * spp_address - This specifies which address is of interest.
2372 * spp_hbinterval - This contains the value of the heartbeat interval,
2373 * in milliseconds. If a value of zero
2374 * is present in this field then no changes are to
2375 * be made to this parameter.
2376 * spp_pathmaxrxt - This contains the maximum number of
2377 * retransmissions before this address shall be
2378 * considered unreachable. If a value of zero
2379 * is present in this field then no changes are to
2380 * be made to this parameter.
2381 * spp_pathmtu - When Path MTU discovery is disabled the value
2382 * specified here will be the "fixed" path mtu.
2383 * Note that if the spp_address field is empty
2384 * then all associations on this address will
2385 * have this fixed path mtu set upon them.
2387 * spp_sackdelay - When delayed sack is enabled, this value specifies
2388 * the number of milliseconds that sacks will be delayed
2389 * for. This value will apply to all addresses of an
2390 * association if the spp_address field is empty. Note
2391 * also, that if delayed sack is enabled and this
2392 * value is set to 0, no change is made to the last
2393 * recorded delayed sack timer value.
2395 * spp_flags - These flags are used to control various features
2396 * on an association. The flag field may contain
2397 * zero or more of the following options.
2399 * SPP_HB_ENABLE - Enable heartbeats on the
2400 * specified address. Note that if the address
2401 * field is empty all addresses for the association
2402 * have heartbeats enabled upon them.
2404 * SPP_HB_DISABLE - Disable heartbeats on the
2405 * speicifed address. Note that if the address
2406 * field is empty all addresses for the association
2407 * will have their heartbeats disabled. Note also
2408 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2409 * mutually exclusive, only one of these two should
2410 * be specified. Enabling both fields will have
2411 * undetermined results.
2413 * SPP_HB_DEMAND - Request a user initiated heartbeat
2414 * to be made immediately.
2416 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2417 * heartbeat delayis to be set to the value of 0
2420 * SPP_PMTUD_ENABLE - This field will enable PMTU
2421 * discovery upon the specified address. Note that
2422 * if the address feild is empty then all addresses
2423 * on the association are effected.
2425 * SPP_PMTUD_DISABLE - This field will disable PMTU
2426 * discovery upon the specified address. Note that
2427 * if the address feild is empty then all addresses
2428 * on the association are effected. Not also that
2429 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2430 * exclusive. Enabling both will have undetermined
2433 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2434 * on delayed sack. The time specified in spp_sackdelay
2435 * is used to specify the sack delay for this address. Note
2436 * that if spp_address is empty then all addresses will
2437 * enable delayed sack and take on the sack delay
2438 * value specified in spp_sackdelay.
2439 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2440 * off delayed sack. If the spp_address field is blank then
2441 * delayed sack is disabled for the entire association. Note
2442 * also that this field is mutually exclusive to
2443 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2446 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2447 struct sctp_transport *trans,
2448 struct sctp_association *asoc,
2449 struct sctp_sock *sp,
2452 int sackdelay_change)
2456 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2457 struct net *net = sock_net(trans->asoc->base.sk);
2459 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2464 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2465 * this field is ignored. Note also that a value of zero indicates
2466 * the current setting should be left unchanged.
2468 if (params->spp_flags & SPP_HB_ENABLE) {
2470 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2471 * set. This lets us use 0 value when this flag
2474 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2475 params->spp_hbinterval = 0;
2477 if (params->spp_hbinterval ||
2478 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2481 msecs_to_jiffies(params->spp_hbinterval);
2482 sctp_transport_reset_hb_timer(trans);
2485 msecs_to_jiffies(params->spp_hbinterval);
2487 sp->hbinterval = params->spp_hbinterval;
2494 trans->param_flags =
2495 (trans->param_flags & ~SPP_HB) | hb_change;
2498 (asoc->param_flags & ~SPP_HB) | hb_change;
2501 (sp->param_flags & ~SPP_HB) | hb_change;
2505 /* When Path MTU discovery is disabled the value specified here will
2506 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2507 * include the flag SPP_PMTUD_DISABLE for this field to have any
2510 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2512 trans->pathmtu = params->spp_pathmtu;
2513 sctp_assoc_sync_pmtu(asoc);
2515 asoc->pathmtu = params->spp_pathmtu;
2517 sp->pathmtu = params->spp_pathmtu;
2523 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2524 (params->spp_flags & SPP_PMTUD_ENABLE);
2525 trans->param_flags =
2526 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2528 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2529 sctp_assoc_sync_pmtu(asoc);
2533 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2536 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2540 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2541 * value of this field is ignored. Note also that a value of zero
2542 * indicates the current setting should be left unchanged.
2544 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2547 msecs_to_jiffies(params->spp_sackdelay);
2550 msecs_to_jiffies(params->spp_sackdelay);
2552 sp->sackdelay = params->spp_sackdelay;
2556 if (sackdelay_change) {
2558 trans->param_flags =
2559 (trans->param_flags & ~SPP_SACKDELAY) |
2563 (asoc->param_flags & ~SPP_SACKDELAY) |
2567 (sp->param_flags & ~SPP_SACKDELAY) |
2572 /* Note that a value of zero indicates the current setting should be
2575 if (params->spp_pathmaxrxt) {
2577 trans->pathmaxrxt = params->spp_pathmaxrxt;
2579 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2581 sp->pathmaxrxt = params->spp_pathmaxrxt;
2588 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2589 char __user *optval,
2590 unsigned int optlen)
2592 struct sctp_paddrparams params;
2593 struct sctp_transport *trans = NULL;
2594 struct sctp_association *asoc = NULL;
2595 struct sctp_sock *sp = sctp_sk(sk);
2597 int hb_change, pmtud_change, sackdelay_change;
2599 if (optlen != sizeof(struct sctp_paddrparams))
2602 if (copy_from_user(¶ms, optval, optlen))
2605 /* Validate flags and value parameters. */
2606 hb_change = params.spp_flags & SPP_HB;
2607 pmtud_change = params.spp_flags & SPP_PMTUD;
2608 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2610 if (hb_change == SPP_HB ||
2611 pmtud_change == SPP_PMTUD ||
2612 sackdelay_change == SPP_SACKDELAY ||
2613 params.spp_sackdelay > 500 ||
2614 (params.spp_pathmtu &&
2615 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2618 /* If an address other than INADDR_ANY is specified, and
2619 * no transport is found, then the request is invalid.
2621 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2622 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2623 params.spp_assoc_id);
2628 /* Get association, if assoc_id != 0 and the socket is a one
2629 * to many style socket, and an association was not found, then
2630 * the id was invalid.
2632 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2633 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2636 /* Heartbeat demand can only be sent on a transport or
2637 * association, but not a socket.
2639 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2642 /* Process parameters. */
2643 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2644 hb_change, pmtud_change,
2650 /* If changes are for association, also apply parameters to each
2653 if (!trans && asoc) {
2654 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2656 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2657 hb_change, pmtud_change,
2665 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2667 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2670 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2672 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2676 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2678 * This option will effect the way delayed acks are performed. This
2679 * option allows you to get or set the delayed ack time, in
2680 * milliseconds. It also allows changing the delayed ack frequency.
2681 * Changing the frequency to 1 disables the delayed sack algorithm. If
2682 * the assoc_id is 0, then this sets or gets the endpoints default
2683 * values. If the assoc_id field is non-zero, then the set or get
2684 * effects the specified association for the one to many model (the
2685 * assoc_id field is ignored by the one to one model). Note that if
2686 * sack_delay or sack_freq are 0 when setting this option, then the
2687 * current values will remain unchanged.
2689 * struct sctp_sack_info {
2690 * sctp_assoc_t sack_assoc_id;
2691 * uint32_t sack_delay;
2692 * uint32_t sack_freq;
2695 * sack_assoc_id - This parameter, indicates which association the user
2696 * is performing an action upon. Note that if this field's value is
2697 * zero then the endpoints default value is changed (effecting future
2698 * associations only).
2700 * sack_delay - This parameter contains the number of milliseconds that
2701 * the user is requesting the delayed ACK timer be set to. Note that
2702 * this value is defined in the standard to be between 200 and 500
2705 * sack_freq - This parameter contains the number of packets that must
2706 * be received before a sack is sent without waiting for the delay
2707 * timer to expire. The default value for this is 2, setting this
2708 * value to 1 will disable the delayed sack algorithm.
2711 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2712 char __user *optval, unsigned int optlen)
2714 struct sctp_sack_info params;
2715 struct sctp_transport *trans = NULL;
2716 struct sctp_association *asoc = NULL;
2717 struct sctp_sock *sp = sctp_sk(sk);
2719 if (optlen == sizeof(struct sctp_sack_info)) {
2720 if (copy_from_user(¶ms, optval, optlen))
2723 if (params.sack_delay == 0 && params.sack_freq == 0)
2725 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2726 pr_warn_ratelimited(DEPRECATED
2728 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2729 "Use struct sctp_sack_info instead\n",
2730 current->comm, task_pid_nr(current));
2731 if (copy_from_user(¶ms, optval, optlen))
2734 if (params.sack_delay == 0)
2735 params.sack_freq = 1;
2737 params.sack_freq = 0;
2741 /* Validate value parameter. */
2742 if (params.sack_delay > 500)
2745 /* Get association, if sack_assoc_id != 0 and the socket is a one
2746 * to many style socket, and an association was not found, then
2747 * the id was invalid.
2749 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2750 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2753 if (params.sack_delay) {
2756 msecs_to_jiffies(params.sack_delay);
2758 sctp_spp_sackdelay_enable(asoc->param_flags);
2760 sp->sackdelay = params.sack_delay;
2762 sctp_spp_sackdelay_enable(sp->param_flags);
2766 if (params.sack_freq == 1) {
2769 sctp_spp_sackdelay_disable(asoc->param_flags);
2772 sctp_spp_sackdelay_disable(sp->param_flags);
2774 } else if (params.sack_freq > 1) {
2776 asoc->sackfreq = params.sack_freq;
2778 sctp_spp_sackdelay_enable(asoc->param_flags);
2780 sp->sackfreq = params.sack_freq;
2782 sctp_spp_sackdelay_enable(sp->param_flags);
2786 /* If change is for association, also apply to each transport. */
2788 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2790 if (params.sack_delay) {
2792 msecs_to_jiffies(params.sack_delay);
2793 trans->param_flags =
2794 sctp_spp_sackdelay_enable(trans->param_flags);
2796 if (params.sack_freq == 1) {
2797 trans->param_flags =
2798 sctp_spp_sackdelay_disable(trans->param_flags);
2799 } else if (params.sack_freq > 1) {
2800 trans->sackfreq = params.sack_freq;
2801 trans->param_flags =
2802 sctp_spp_sackdelay_enable(trans->param_flags);
2810 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2812 * Applications can specify protocol parameters for the default association
2813 * initialization. The option name argument to setsockopt() and getsockopt()
2816 * Setting initialization parameters is effective only on an unconnected
2817 * socket (for UDP-style sockets only future associations are effected
2818 * by the change). With TCP-style sockets, this option is inherited by
2819 * sockets derived from a listener socket.
2821 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2823 struct sctp_initmsg sinit;
2824 struct sctp_sock *sp = sctp_sk(sk);
2826 if (optlen != sizeof(struct sctp_initmsg))
2828 if (copy_from_user(&sinit, optval, optlen))
2831 if (sinit.sinit_num_ostreams)
2832 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2833 if (sinit.sinit_max_instreams)
2834 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2835 if (sinit.sinit_max_attempts)
2836 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2837 if (sinit.sinit_max_init_timeo)
2838 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2844 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2846 * Applications that wish to use the sendto() system call may wish to
2847 * specify a default set of parameters that would normally be supplied
2848 * through the inclusion of ancillary data. This socket option allows
2849 * such an application to set the default sctp_sndrcvinfo structure.
2850 * The application that wishes to use this socket option simply passes
2851 * in to this call the sctp_sndrcvinfo structure defined in Section
2852 * 5.2.2) The input parameters accepted by this call include
2853 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2854 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2855 * to this call if the caller is using the UDP model.
2857 static int sctp_setsockopt_default_send_param(struct sock *sk,
2858 char __user *optval,
2859 unsigned int optlen)
2861 struct sctp_sock *sp = sctp_sk(sk);
2862 struct sctp_association *asoc;
2863 struct sctp_sndrcvinfo info;
2865 if (optlen != sizeof(info))
2867 if (copy_from_user(&info, optval, optlen))
2869 if (info.sinfo_flags &
2870 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2871 SCTP_ABORT | SCTP_EOF))
2874 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2875 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2878 asoc->default_stream = info.sinfo_stream;
2879 asoc->default_flags = info.sinfo_flags;
2880 asoc->default_ppid = info.sinfo_ppid;
2881 asoc->default_context = info.sinfo_context;
2882 asoc->default_timetolive = info.sinfo_timetolive;
2884 sp->default_stream = info.sinfo_stream;
2885 sp->default_flags = info.sinfo_flags;
2886 sp->default_ppid = info.sinfo_ppid;
2887 sp->default_context = info.sinfo_context;
2888 sp->default_timetolive = info.sinfo_timetolive;
2894 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2895 * (SCTP_DEFAULT_SNDINFO)
2897 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2898 char __user *optval,
2899 unsigned int optlen)
2901 struct sctp_sock *sp = sctp_sk(sk);
2902 struct sctp_association *asoc;
2903 struct sctp_sndinfo info;
2905 if (optlen != sizeof(info))
2907 if (copy_from_user(&info, optval, optlen))
2909 if (info.snd_flags &
2910 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2911 SCTP_ABORT | SCTP_EOF))
2914 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2915 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2918 asoc->default_stream = info.snd_sid;
2919 asoc->default_flags = info.snd_flags;
2920 asoc->default_ppid = info.snd_ppid;
2921 asoc->default_context = info.snd_context;
2923 sp->default_stream = info.snd_sid;
2924 sp->default_flags = info.snd_flags;
2925 sp->default_ppid = info.snd_ppid;
2926 sp->default_context = info.snd_context;
2932 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2934 * Requests that the local SCTP stack use the enclosed peer address as
2935 * the association primary. The enclosed address must be one of the
2936 * association peer's addresses.
2938 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2939 unsigned int optlen)
2941 struct sctp_prim prim;
2942 struct sctp_transport *trans;
2944 if (optlen != sizeof(struct sctp_prim))
2947 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2950 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2954 sctp_assoc_set_primary(trans->asoc, trans);
2960 * 7.1.5 SCTP_NODELAY
2962 * Turn on/off any Nagle-like algorithm. This means that packets are
2963 * generally sent as soon as possible and no unnecessary delays are
2964 * introduced, at the cost of more packets in the network. Expects an
2965 * integer boolean flag.
2967 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2968 unsigned int optlen)
2972 if (optlen < sizeof(int))
2974 if (get_user(val, (int __user *)optval))
2977 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2983 * 7.1.1 SCTP_RTOINFO
2985 * The protocol parameters used to initialize and bound retransmission
2986 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2987 * and modify these parameters.
2988 * All parameters are time values, in milliseconds. A value of 0, when
2989 * modifying the parameters, indicates that the current value should not
2993 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2995 struct sctp_rtoinfo rtoinfo;
2996 struct sctp_association *asoc;
2997 unsigned long rto_min, rto_max;
2998 struct sctp_sock *sp = sctp_sk(sk);
3000 if (optlen != sizeof (struct sctp_rtoinfo))
3003 if (copy_from_user(&rtoinfo, optval, optlen))
3006 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3008 /* Set the values to the specific association */
3009 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
3012 rto_max = rtoinfo.srto_max;
3013 rto_min = rtoinfo.srto_min;
3016 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3018 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3021 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3023 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3025 if (rto_min > rto_max)
3029 if (rtoinfo.srto_initial != 0)
3031 msecs_to_jiffies(rtoinfo.srto_initial);
3032 asoc->rto_max = rto_max;
3033 asoc->rto_min = rto_min;
3035 /* If there is no association or the association-id = 0
3036 * set the values to the endpoint.
3038 if (rtoinfo.srto_initial != 0)
3039 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3040 sp->rtoinfo.srto_max = rto_max;
3041 sp->rtoinfo.srto_min = rto_min;
3049 * 7.1.2 SCTP_ASSOCINFO
3051 * This option is used to tune the maximum retransmission attempts
3052 * of the association.
3053 * Returns an error if the new association retransmission value is
3054 * greater than the sum of the retransmission value of the peer.
3055 * See [SCTP] for more information.
3058 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3061 struct sctp_assocparams assocparams;
3062 struct sctp_association *asoc;
3064 if (optlen != sizeof(struct sctp_assocparams))
3066 if (copy_from_user(&assocparams, optval, optlen))
3069 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3071 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3074 /* Set the values to the specific association */
3076 if (assocparams.sasoc_asocmaxrxt != 0) {
3079 struct sctp_transport *peer_addr;
3081 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3083 path_sum += peer_addr->pathmaxrxt;
3087 /* Only validate asocmaxrxt if we have more than
3088 * one path/transport. We do this because path
3089 * retransmissions are only counted when we have more
3093 assocparams.sasoc_asocmaxrxt > path_sum)
3096 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3099 if (assocparams.sasoc_cookie_life != 0)
3100 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3102 /* Set the values to the endpoint */
3103 struct sctp_sock *sp = sctp_sk(sk);
3105 if (assocparams.sasoc_asocmaxrxt != 0)
3106 sp->assocparams.sasoc_asocmaxrxt =
3107 assocparams.sasoc_asocmaxrxt;
3108 if (assocparams.sasoc_cookie_life != 0)
3109 sp->assocparams.sasoc_cookie_life =
3110 assocparams.sasoc_cookie_life;
3116 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3118 * This socket option is a boolean flag which turns on or off mapped V4
3119 * addresses. If this option is turned on and the socket is type
3120 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3121 * If this option is turned off, then no mapping will be done of V4
3122 * addresses and a user will receive both PF_INET6 and PF_INET type
3123 * addresses on the socket.
3125 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3128 struct sctp_sock *sp = sctp_sk(sk);
3130 if (optlen < sizeof(int))
3132 if (get_user(val, (int __user *)optval))
3143 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3144 * This option will get or set the maximum size to put in any outgoing
3145 * SCTP DATA chunk. If a message is larger than this size it will be
3146 * fragmented by SCTP into the specified size. Note that the underlying
3147 * SCTP implementation may fragment into smaller sized chunks when the
3148 * PMTU of the underlying association is smaller than the value set by
3149 * the user. The default value for this option is '0' which indicates
3150 * the user is NOT limiting fragmentation and only the PMTU will effect
3151 * SCTP's choice of DATA chunk size. Note also that values set larger
3152 * than the maximum size of an IP datagram will effectively let SCTP
3153 * control fragmentation (i.e. the same as setting this option to 0).
3155 * The following structure is used to access and modify this parameter:
3157 * struct sctp_assoc_value {
3158 * sctp_assoc_t assoc_id;
3159 * uint32_t assoc_value;
3162 * assoc_id: This parameter is ignored for one-to-one style sockets.
3163 * For one-to-many style sockets this parameter indicates which
3164 * association the user is performing an action upon. Note that if
3165 * this field's value is zero then the endpoints default value is
3166 * changed (effecting future associations only).
3167 * assoc_value: This parameter specifies the maximum size in bytes.
3169 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3171 struct sctp_sock *sp = sctp_sk(sk);
3172 struct sctp_assoc_value params;
3173 struct sctp_association *asoc;
3176 if (optlen == sizeof(int)) {
3177 pr_warn_ratelimited(DEPRECATED
3179 "Use of int in maxseg socket option.\n"
3180 "Use struct sctp_assoc_value instead\n",
3181 current->comm, task_pid_nr(current));
3182 if (copy_from_user(&val, optval, optlen))
3184 params.assoc_id = 0;
3185 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3186 if (copy_from_user(¶ms, optval, optlen))
3188 val = params.assoc_value;
3194 int min_len, max_len;
3196 min_len = SCTP_DEFAULT_MINSEGMENT - sp->pf->af->net_header_len;
3197 min_len -= sizeof(struct sctphdr) +
3198 sizeof(struct sctp_data_chunk);
3200 max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
3202 if (val < min_len || val > max_len)
3206 asoc = sctp_id2assoc(sk, params.assoc_id);
3209 val = asoc->pathmtu - sp->pf->af->net_header_len;
3210 val -= sizeof(struct sctphdr) +
3211 sizeof(struct sctp_data_chunk);
3213 asoc->user_frag = val;
3214 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3216 if (params.assoc_id && sctp_style(sk, UDP))
3218 sp->user_frag = val;
3226 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3228 * Requests that the peer mark the enclosed address as the association
3229 * primary. The enclosed address must be one of the association's
3230 * locally bound addresses. The following structure is used to make a
3231 * set primary request:
3233 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3234 unsigned int optlen)
3236 struct net *net = sock_net(sk);
3237 struct sctp_sock *sp;
3238 struct sctp_association *asoc = NULL;
3239 struct sctp_setpeerprim prim;
3240 struct sctp_chunk *chunk;
3246 if (!net->sctp.addip_enable)
3249 if (optlen != sizeof(struct sctp_setpeerprim))
3252 if (copy_from_user(&prim, optval, optlen))
3255 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3259 if (!asoc->peer.asconf_capable)
3262 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3265 if (!sctp_state(asoc, ESTABLISHED))
3268 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3272 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3273 return -EADDRNOTAVAIL;
3275 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3276 return -EADDRNOTAVAIL;
3278 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3279 chunk = sctp_make_asconf_set_prim(asoc,
3280 (union sctp_addr *)&prim.sspp_addr);
3284 err = sctp_send_asconf(asoc, chunk);
3286 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3291 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3292 unsigned int optlen)
3294 struct sctp_setadaptation adaptation;
3296 if (optlen != sizeof(struct sctp_setadaptation))
3298 if (copy_from_user(&adaptation, optval, optlen))
3301 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3307 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3309 * The context field in the sctp_sndrcvinfo structure is normally only
3310 * used when a failed message is retrieved holding the value that was
3311 * sent down on the actual send call. This option allows the setting of
3312 * a default context on an association basis that will be received on
3313 * reading messages from the peer. This is especially helpful in the
3314 * one-2-many model for an application to keep some reference to an
3315 * internal state machine that is processing messages on the
3316 * association. Note that the setting of this value only effects
3317 * received messages from the peer and does not effect the value that is
3318 * saved with outbound messages.
3320 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3321 unsigned int optlen)
3323 struct sctp_assoc_value params;
3324 struct sctp_sock *sp;
3325 struct sctp_association *asoc;
3327 if (optlen != sizeof(struct sctp_assoc_value))
3329 if (copy_from_user(¶ms, optval, optlen))
3334 if (params.assoc_id != 0) {
3335 asoc = sctp_id2assoc(sk, params.assoc_id);
3338 asoc->default_rcv_context = params.assoc_value;
3340 sp->default_rcv_context = params.assoc_value;
3347 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3349 * This options will at a minimum specify if the implementation is doing
3350 * fragmented interleave. Fragmented interleave, for a one to many
3351 * socket, is when subsequent calls to receive a message may return
3352 * parts of messages from different associations. Some implementations
3353 * may allow you to turn this value on or off. If so, when turned off,
3354 * no fragment interleave will occur (which will cause a head of line
3355 * blocking amongst multiple associations sharing the same one to many
3356 * socket). When this option is turned on, then each receive call may
3357 * come from a different association (thus the user must receive data
3358 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3359 * association each receive belongs to.
3361 * This option takes a boolean value. A non-zero value indicates that
3362 * fragmented interleave is on. A value of zero indicates that
3363 * fragmented interleave is off.
3365 * Note that it is important that an implementation that allows this
3366 * option to be turned on, have it off by default. Otherwise an unaware
3367 * application using the one to many model may become confused and act
3370 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3371 char __user *optval,
3372 unsigned int optlen)
3376 if (optlen != sizeof(int))
3378 if (get_user(val, (int __user *)optval))
3381 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3387 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3388 * (SCTP_PARTIAL_DELIVERY_POINT)
3390 * This option will set or get the SCTP partial delivery point. This
3391 * point is the size of a message where the partial delivery API will be
3392 * invoked to help free up rwnd space for the peer. Setting this to a
3393 * lower value will cause partial deliveries to happen more often. The
3394 * calls argument is an integer that sets or gets the partial delivery
3395 * point. Note also that the call will fail if the user attempts to set
3396 * this value larger than the socket receive buffer size.
3398 * Note that any single message having a length smaller than or equal to
3399 * the SCTP partial delivery point will be delivered in one single read
3400 * call as long as the user provided buffer is large enough to hold the
3403 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3404 char __user *optval,
3405 unsigned int optlen)
3409 if (optlen != sizeof(u32))
3411 if (get_user(val, (int __user *)optval))
3414 /* Note: We double the receive buffer from what the user sets
3415 * it to be, also initial rwnd is based on rcvbuf/2.
3417 if (val > (sk->sk_rcvbuf >> 1))
3420 sctp_sk(sk)->pd_point = val;
3422 return 0; /* is this the right error code? */
3426 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3428 * This option will allow a user to change the maximum burst of packets
3429 * that can be emitted by this association. Note that the default value
3430 * is 4, and some implementations may restrict this setting so that it
3431 * can only be lowered.
3433 * NOTE: This text doesn't seem right. Do this on a socket basis with
3434 * future associations inheriting the socket value.
3436 static int sctp_setsockopt_maxburst(struct sock *sk,
3437 char __user *optval,
3438 unsigned int optlen)
3440 struct sctp_assoc_value params;
3441 struct sctp_sock *sp;
3442 struct sctp_association *asoc;
3446 if (optlen == sizeof(int)) {
3447 pr_warn_ratelimited(DEPRECATED
3449 "Use of int in max_burst socket option deprecated.\n"
3450 "Use struct sctp_assoc_value instead\n",
3451 current->comm, task_pid_nr(current));
3452 if (copy_from_user(&val, optval, optlen))
3454 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3455 if (copy_from_user(¶ms, optval, optlen))
3457 val = params.assoc_value;
3458 assoc_id = params.assoc_id;
3464 if (assoc_id != 0) {
3465 asoc = sctp_id2assoc(sk, assoc_id);
3468 asoc->max_burst = val;
3470 sp->max_burst = val;
3476 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3478 * This set option adds a chunk type that the user is requesting to be
3479 * received only in an authenticated way. Changes to the list of chunks
3480 * will only effect future associations on the socket.
3482 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3483 char __user *optval,
3484 unsigned int optlen)
3486 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3487 struct sctp_authchunk val;
3489 if (!ep->auth_enable)
3492 if (optlen != sizeof(struct sctp_authchunk))
3494 if (copy_from_user(&val, optval, optlen))
3497 switch (val.sauth_chunk) {
3499 case SCTP_CID_INIT_ACK:
3500 case SCTP_CID_SHUTDOWN_COMPLETE:
3505 /* add this chunk id to the endpoint */
3506 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3510 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3512 * This option gets or sets the list of HMAC algorithms that the local
3513 * endpoint requires the peer to use.
3515 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3516 char __user *optval,
3517 unsigned int optlen)
3519 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3520 struct sctp_hmacalgo *hmacs;
3524 if (!ep->auth_enable)
3527 if (optlen < sizeof(struct sctp_hmacalgo))
3529 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3530 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3532 hmacs = memdup_user(optval, optlen);
3534 return PTR_ERR(hmacs);
3536 idents = hmacs->shmac_num_idents;
3537 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3538 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3543 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3550 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3552 * This option will set a shared secret key which is used to build an
3553 * association shared key.
3555 static int sctp_setsockopt_auth_key(struct sock *sk,
3556 char __user *optval,
3557 unsigned int optlen)
3559 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3560 struct sctp_authkey *authkey;
3561 struct sctp_association *asoc;
3564 if (!ep->auth_enable)
3567 if (optlen <= sizeof(struct sctp_authkey))
3569 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3572 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3573 sizeof(struct sctp_authkey));
3575 authkey = memdup_user(optval, optlen);
3576 if (IS_ERR(authkey))
3577 return PTR_ERR(authkey);
3579 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3584 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3585 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3590 ret = sctp_auth_set_key(ep, asoc, authkey);
3597 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3599 * This option will get or set the active shared key to be used to build
3600 * the association shared key.
3602 static int sctp_setsockopt_active_key(struct sock *sk,
3603 char __user *optval,
3604 unsigned int optlen)
3606 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3607 struct sctp_authkeyid val;
3608 struct sctp_association *asoc;
3610 if (!ep->auth_enable)
3613 if (optlen != sizeof(struct sctp_authkeyid))
3615 if (copy_from_user(&val, optval, optlen))
3618 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3619 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3622 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3626 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3628 * This set option will delete a shared secret key from use.
3630 static int sctp_setsockopt_del_key(struct sock *sk,
3631 char __user *optval,
3632 unsigned int optlen)
3634 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3635 struct sctp_authkeyid val;
3636 struct sctp_association *asoc;
3638 if (!ep->auth_enable)
3641 if (optlen != sizeof(struct sctp_authkeyid))
3643 if (copy_from_user(&val, optval, optlen))
3646 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3647 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3650 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3655 * 8.1.23 SCTP_AUTO_ASCONF
3657 * This option will enable or disable the use of the automatic generation of
3658 * ASCONF chunks to add and delete addresses to an existing association. Note
3659 * that this option has two caveats namely: a) it only affects sockets that
3660 * are bound to all addresses available to the SCTP stack, and b) the system
3661 * administrator may have an overriding control that turns the ASCONF feature
3662 * off no matter what setting the socket option may have.
3663 * This option expects an integer boolean flag, where a non-zero value turns on
3664 * the option, and a zero value turns off the option.
3665 * Note. In this implementation, socket operation overrides default parameter
3666 * being set by sysctl as well as FreeBSD implementation
3668 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3669 unsigned int optlen)
3672 struct sctp_sock *sp = sctp_sk(sk);
3674 if (optlen < sizeof(int))
3676 if (get_user(val, (int __user *)optval))
3678 if (!sctp_is_ep_boundall(sk) && val)
3680 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3683 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3684 if (val == 0 && sp->do_auto_asconf) {
3685 list_del(&sp->auto_asconf_list);
3686 sp->do_auto_asconf = 0;
3687 } else if (val && !sp->do_auto_asconf) {
3688 list_add_tail(&sp->auto_asconf_list,
3689 &sock_net(sk)->sctp.auto_asconf_splist);
3690 sp->do_auto_asconf = 1;
3692 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3697 * SCTP_PEER_ADDR_THLDS
3699 * This option allows us to alter the partially failed threshold for one or all
3700 * transports in an association. See Section 6.1 of:
3701 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3703 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3704 char __user *optval,
3705 unsigned int optlen)
3707 struct sctp_paddrthlds val;
3708 struct sctp_transport *trans;
3709 struct sctp_association *asoc;
3711 if (optlen < sizeof(struct sctp_paddrthlds))
3713 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3714 sizeof(struct sctp_paddrthlds)))
3718 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3719 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3722 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3724 if (val.spt_pathmaxrxt)
3725 trans->pathmaxrxt = val.spt_pathmaxrxt;
3726 trans->pf_retrans = val.spt_pathpfthld;
3729 if (val.spt_pathmaxrxt)
3730 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3731 asoc->pf_retrans = val.spt_pathpfthld;
3733 trans = sctp_addr_id2transport(sk, &val.spt_address,
3738 if (val.spt_pathmaxrxt)
3739 trans->pathmaxrxt = val.spt_pathmaxrxt;
3740 trans->pf_retrans = val.spt_pathpfthld;
3746 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3747 char __user *optval,
3748 unsigned int optlen)
3752 if (optlen < sizeof(int))
3754 if (get_user(val, (int __user *) optval))
3757 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3762 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3763 char __user *optval,
3764 unsigned int optlen)
3768 if (optlen < sizeof(int))
3770 if (get_user(val, (int __user *) optval))
3773 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3778 static int sctp_setsockopt_pr_supported(struct sock *sk,
3779 char __user *optval,
3780 unsigned int optlen)
3782 struct sctp_assoc_value params;
3784 if (optlen != sizeof(params))
3787 if (copy_from_user(¶ms, optval, optlen))
3790 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
3795 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3796 char __user *optval,
3797 unsigned int optlen)
3799 struct sctp_default_prinfo info;
3800 struct sctp_association *asoc;
3801 int retval = -EINVAL;
3803 if (optlen != sizeof(info))
3806 if (copy_from_user(&info, optval, sizeof(info))) {
3811 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3814 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3817 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3819 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3820 asoc->default_timetolive = info.pr_value;
3821 } else if (!info.pr_assoc_id) {
3822 struct sctp_sock *sp = sctp_sk(sk);
3824 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3825 sp->default_timetolive = info.pr_value;
3836 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3837 char __user *optval,
3838 unsigned int optlen)
3840 struct sctp_assoc_value params;
3841 struct sctp_association *asoc;
3842 int retval = -EINVAL;
3844 if (optlen != sizeof(params))
3847 if (copy_from_user(¶ms, optval, optlen)) {
3852 asoc = sctp_id2assoc(sk, params.assoc_id);
3854 asoc->reconf_enable = !!params.assoc_value;
3855 } else if (!params.assoc_id) {
3856 struct sctp_sock *sp = sctp_sk(sk);
3858 sp->ep->reconf_enable = !!params.assoc_value;
3869 static int sctp_setsockopt_enable_strreset(struct sock *sk,
3870 char __user *optval,
3871 unsigned int optlen)
3873 struct sctp_assoc_value params;
3874 struct sctp_association *asoc;
3875 int retval = -EINVAL;
3877 if (optlen != sizeof(params))
3880 if (copy_from_user(¶ms, optval, optlen)) {
3885 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3888 asoc = sctp_id2assoc(sk, params.assoc_id);
3890 asoc->strreset_enable = params.assoc_value;
3891 } else if (!params.assoc_id) {
3892 struct sctp_sock *sp = sctp_sk(sk);
3894 sp->ep->strreset_enable = params.assoc_value;
3905 static int sctp_setsockopt_reset_streams(struct sock *sk,
3906 char __user *optval,
3907 unsigned int optlen)
3909 struct sctp_reset_streams *params;
3910 struct sctp_association *asoc;
3911 int retval = -EINVAL;
3913 if (optlen < sizeof(*params))
3915 /* srs_number_streams is u16, so optlen can't be bigger than this. */
3916 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3917 sizeof(__u16) * sizeof(*params));
3919 params = memdup_user(optval, optlen);
3921 return PTR_ERR(params);
3923 if (params->srs_number_streams * sizeof(__u16) >
3924 optlen - sizeof(*params))
3927 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
3931 retval = sctp_send_reset_streams(asoc, params);
3938 static int sctp_setsockopt_reset_assoc(struct sock *sk,
3939 char __user *optval,
3940 unsigned int optlen)
3942 struct sctp_association *asoc;
3943 sctp_assoc_t associd;
3944 int retval = -EINVAL;
3946 if (optlen != sizeof(associd))
3949 if (copy_from_user(&associd, optval, optlen)) {
3954 asoc = sctp_id2assoc(sk, associd);
3958 retval = sctp_send_reset_assoc(asoc);
3964 static int sctp_setsockopt_add_streams(struct sock *sk,
3965 char __user *optval,
3966 unsigned int optlen)
3968 struct sctp_association *asoc;
3969 struct sctp_add_streams params;
3970 int retval = -EINVAL;
3972 if (optlen != sizeof(params))
3975 if (copy_from_user(¶ms, optval, optlen)) {
3980 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
3984 retval = sctp_send_add_streams(asoc, ¶ms);
3990 /* API 6.2 setsockopt(), getsockopt()
3992 * Applications use setsockopt() and getsockopt() to set or retrieve
3993 * socket options. Socket options are used to change the default
3994 * behavior of sockets calls. They are described in Section 7.
3998 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3999 * int __user *optlen);
4000 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4003 * sd - the socket descript.
4004 * level - set to IPPROTO_SCTP for all SCTP options.
4005 * optname - the option name.
4006 * optval - the buffer to store the value of the option.
4007 * optlen - the size of the buffer.
4009 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4010 char __user *optval, unsigned int optlen)
4014 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4016 /* I can hardly begin to describe how wrong this is. This is
4017 * so broken as to be worse than useless. The API draft
4018 * REALLY is NOT helpful here... I am not convinced that the
4019 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4020 * are at all well-founded.
4022 if (level != SOL_SCTP) {
4023 struct sctp_af *af = sctp_sk(sk)->pf->af;
4024 retval = af->setsockopt(sk, level, optname, optval, optlen);
4031 case SCTP_SOCKOPT_BINDX_ADD:
4032 /* 'optlen' is the size of the addresses buffer. */
4033 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4034 optlen, SCTP_BINDX_ADD_ADDR);
4037 case SCTP_SOCKOPT_BINDX_REM:
4038 /* 'optlen' is the size of the addresses buffer. */
4039 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4040 optlen, SCTP_BINDX_REM_ADDR);
4043 case SCTP_SOCKOPT_CONNECTX_OLD:
4044 /* 'optlen' is the size of the addresses buffer. */
4045 retval = sctp_setsockopt_connectx_old(sk,
4046 (struct sockaddr __user *)optval,
4050 case SCTP_SOCKOPT_CONNECTX:
4051 /* 'optlen' is the size of the addresses buffer. */
4052 retval = sctp_setsockopt_connectx(sk,
4053 (struct sockaddr __user *)optval,
4057 case SCTP_DISABLE_FRAGMENTS:
4058 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4062 retval = sctp_setsockopt_events(sk, optval, optlen);
4065 case SCTP_AUTOCLOSE:
4066 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4069 case SCTP_PEER_ADDR_PARAMS:
4070 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4073 case SCTP_DELAYED_SACK:
4074 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4076 case SCTP_PARTIAL_DELIVERY_POINT:
4077 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4081 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4083 case SCTP_DEFAULT_SEND_PARAM:
4084 retval = sctp_setsockopt_default_send_param(sk, optval,
4087 case SCTP_DEFAULT_SNDINFO:
4088 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4090 case SCTP_PRIMARY_ADDR:
4091 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4093 case SCTP_SET_PEER_PRIMARY_ADDR:
4094 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4097 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4100 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4102 case SCTP_ASSOCINFO:
4103 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4105 case SCTP_I_WANT_MAPPED_V4_ADDR:
4106 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4109 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4111 case SCTP_ADAPTATION_LAYER:
4112 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4115 retval = sctp_setsockopt_context(sk, optval, optlen);
4117 case SCTP_FRAGMENT_INTERLEAVE:
4118 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4120 case SCTP_MAX_BURST:
4121 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4123 case SCTP_AUTH_CHUNK:
4124 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4126 case SCTP_HMAC_IDENT:
4127 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4130 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4132 case SCTP_AUTH_ACTIVE_KEY:
4133 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4135 case SCTP_AUTH_DELETE_KEY:
4136 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4138 case SCTP_AUTO_ASCONF:
4139 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4141 case SCTP_PEER_ADDR_THLDS:
4142 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4144 case SCTP_RECVRCVINFO:
4145 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4147 case SCTP_RECVNXTINFO:
4148 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4150 case SCTP_PR_SUPPORTED:
4151 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4153 case SCTP_DEFAULT_PRINFO:
4154 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4156 case SCTP_RECONFIG_SUPPORTED:
4157 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4159 case SCTP_ENABLE_STREAM_RESET:
4160 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4162 case SCTP_RESET_STREAMS:
4163 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4165 case SCTP_RESET_ASSOC:
4166 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4168 case SCTP_ADD_STREAMS:
4169 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4172 retval = -ENOPROTOOPT;
4182 /* API 3.1.6 connect() - UDP Style Syntax
4184 * An application may use the connect() call in the UDP model to initiate an
4185 * association without sending data.
4189 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4191 * sd: the socket descriptor to have a new association added to.
4193 * nam: the address structure (either struct sockaddr_in or struct
4194 * sockaddr_in6 defined in RFC2553 [7]).
4196 * len: the size of the address.
4198 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4199 int addr_len, int flags)
4205 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4208 /* Validate addr_len before calling common connect/connectx routine. */
4209 af = sctp_get_af_specific(addr->sa_family);
4210 if (af && addr_len >= af->sockaddr_len)
4211 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4217 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4218 int addr_len, int flags)
4220 if (addr_len < sizeof(uaddr->sa_family))
4223 if (uaddr->sa_family == AF_UNSPEC)
4226 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4229 /* FIXME: Write comments. */
4230 static int sctp_disconnect(struct sock *sk, int flags)
4232 return -EOPNOTSUPP; /* STUB */
4235 /* 4.1.4 accept() - TCP Style Syntax
4237 * Applications use accept() call to remove an established SCTP
4238 * association from the accept queue of the endpoint. A new socket
4239 * descriptor will be returned from accept() to represent the newly
4240 * formed association.
4242 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4244 struct sctp_sock *sp;
4245 struct sctp_endpoint *ep;
4246 struct sock *newsk = NULL;
4247 struct sctp_association *asoc;
4256 if (!sctp_style(sk, TCP)) {
4257 error = -EOPNOTSUPP;
4261 if (!sctp_sstate(sk, LISTENING)) {
4266 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4268 error = sctp_wait_for_accept(sk, timeo);
4272 /* We treat the list of associations on the endpoint as the accept
4273 * queue and pick the first association on the list.
4275 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4277 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4283 /* Populate the fields of the newsk from the oldsk and migrate the
4284 * asoc to the newsk.
4286 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4294 /* The SCTP ioctl handler. */
4295 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4302 * SEQPACKET-style sockets in LISTENING state are valid, for
4303 * SCTP, so only discard TCP-style sockets in LISTENING state.
4305 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4310 struct sk_buff *skb;
4311 unsigned int amount = 0;
4313 skb = skb_peek(&sk->sk_receive_queue);
4316 * We will only return the amount of this packet since
4317 * that is all that will be read.
4321 rc = put_user(amount, (int __user *)arg);
4333 /* This is the function which gets called during socket creation to
4334 * initialized the SCTP-specific portion of the sock.
4335 * The sock structure should already be zero-filled memory.
4337 static int sctp_init_sock(struct sock *sk)
4339 struct net *net = sock_net(sk);
4340 struct sctp_sock *sp;
4342 pr_debug("%s: sk:%p\n", __func__, sk);
4346 /* Initialize the SCTP per socket area. */
4347 switch (sk->sk_type) {
4348 case SOCK_SEQPACKET:
4349 sp->type = SCTP_SOCKET_UDP;
4352 sp->type = SCTP_SOCKET_TCP;
4355 return -ESOCKTNOSUPPORT;
4358 sk->sk_gso_type = SKB_GSO_SCTP;
4360 /* Initialize default send parameters. These parameters can be
4361 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4363 sp->default_stream = 0;
4364 sp->default_ppid = 0;
4365 sp->default_flags = 0;
4366 sp->default_context = 0;
4367 sp->default_timetolive = 0;
4369 sp->default_rcv_context = 0;
4370 sp->max_burst = net->sctp.max_burst;
4372 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4374 /* Initialize default setup parameters. These parameters
4375 * can be modified with the SCTP_INITMSG socket option or
4376 * overridden by the SCTP_INIT CMSG.
4378 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4379 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4380 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4381 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4383 /* Initialize default RTO related parameters. These parameters can
4384 * be modified for with the SCTP_RTOINFO socket option.
4386 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4387 sp->rtoinfo.srto_max = net->sctp.rto_max;
4388 sp->rtoinfo.srto_min = net->sctp.rto_min;
4390 /* Initialize default association related parameters. These parameters
4391 * can be modified with the SCTP_ASSOCINFO socket option.
4393 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4394 sp->assocparams.sasoc_number_peer_destinations = 0;
4395 sp->assocparams.sasoc_peer_rwnd = 0;
4396 sp->assocparams.sasoc_local_rwnd = 0;
4397 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4399 /* Initialize default event subscriptions. By default, all the
4402 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4404 /* Default Peer Address Parameters. These defaults can
4405 * be modified via SCTP_PEER_ADDR_PARAMS
4407 sp->hbinterval = net->sctp.hb_interval;
4408 sp->pathmaxrxt = net->sctp.max_retrans_path;
4409 sp->pathmtu = 0; /* allow default discovery */
4410 sp->sackdelay = net->sctp.sack_timeout;
4412 sp->param_flags = SPP_HB_ENABLE |
4414 SPP_SACKDELAY_ENABLE;
4416 /* If enabled no SCTP message fragmentation will be performed.
4417 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4419 sp->disable_fragments = 0;
4421 /* Enable Nagle algorithm by default. */
4424 sp->recvrcvinfo = 0;
4425 sp->recvnxtinfo = 0;
4427 /* Enable by default. */
4430 /* Auto-close idle associations after the configured
4431 * number of seconds. A value of 0 disables this
4432 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4433 * for UDP-style sockets only.
4437 /* User specified fragmentation limit. */
4440 sp->adaptation_ind = 0;
4442 sp->pf = sctp_get_pf_specific(sk->sk_family);
4444 /* Control variables for partial data delivery. */
4445 atomic_set(&sp->pd_mode, 0);
4446 skb_queue_head_init(&sp->pd_lobby);
4447 sp->frag_interleave = 0;
4449 /* Create a per socket endpoint structure. Even if we
4450 * change the data structure relationships, this may still
4451 * be useful for storing pre-connect address information.
4453 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4459 sk->sk_destruct = sctp_destruct_sock;
4461 SCTP_DBG_OBJCNT_INC(sock);
4464 sk_sockets_allocated_inc(sk);
4465 sock_prot_inuse_add(net, sk->sk_prot, 1);
4472 /* Cleanup any SCTP per socket resources. Must be called with
4473 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4475 static void sctp_destroy_sock(struct sock *sk)
4477 struct sctp_sock *sp;
4479 pr_debug("%s: sk:%p\n", __func__, sk);
4481 /* Release our hold on the endpoint. */
4483 /* This could happen during socket init, thus we bail out
4484 * early, since the rest of the below is not setup either.
4489 if (sp->do_auto_asconf) {
4490 sp->do_auto_asconf = 0;
4491 list_del(&sp->auto_asconf_list);
4493 sctp_endpoint_free(sp->ep);
4495 sk_sockets_allocated_dec(sk);
4496 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4500 /* Triggered when there are no references on the socket anymore */
4501 static void sctp_destruct_common(struct sock *sk)
4503 struct sctp_sock *sp = sctp_sk(sk);
4505 /* Free up the HMAC transform. */
4506 crypto_free_shash(sp->hmac);
4509 static void sctp_destruct_sock(struct sock *sk)
4511 sctp_destruct_common(sk);
4512 inet_sock_destruct(sk);
4515 /* API 4.1.7 shutdown() - TCP Style Syntax
4516 * int shutdown(int socket, int how);
4518 * sd - the socket descriptor of the association to be closed.
4519 * how - Specifies the type of shutdown. The values are
4522 * Disables further receive operations. No SCTP
4523 * protocol action is taken.
4525 * Disables further send operations, and initiates
4526 * the SCTP shutdown sequence.
4528 * Disables further send and receive operations
4529 * and initiates the SCTP shutdown sequence.
4531 static void sctp_shutdown(struct sock *sk, int how)
4533 struct net *net = sock_net(sk);
4534 struct sctp_endpoint *ep;
4536 if (!sctp_style(sk, TCP))
4539 ep = sctp_sk(sk)->ep;
4540 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4541 struct sctp_association *asoc;
4543 sk->sk_state = SCTP_SS_CLOSING;
4544 asoc = list_entry(ep->asocs.next,
4545 struct sctp_association, asocs);
4546 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4550 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4551 struct sctp_info *info)
4553 struct sctp_transport *prim;
4554 struct list_head *pos;
4557 memset(info, 0, sizeof(*info));
4559 struct sctp_sock *sp = sctp_sk(sk);
4561 info->sctpi_s_autoclose = sp->autoclose;
4562 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4563 info->sctpi_s_pd_point = sp->pd_point;
4564 info->sctpi_s_nodelay = sp->nodelay;
4565 info->sctpi_s_disable_fragments = sp->disable_fragments;
4566 info->sctpi_s_v4mapped = sp->v4mapped;
4567 info->sctpi_s_frag_interleave = sp->frag_interleave;
4568 info->sctpi_s_type = sp->type;
4573 info->sctpi_tag = asoc->c.my_vtag;
4574 info->sctpi_state = asoc->state;
4575 info->sctpi_rwnd = asoc->a_rwnd;
4576 info->sctpi_unackdata = asoc->unack_data;
4577 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4578 info->sctpi_instrms = asoc->stream.incnt;
4579 info->sctpi_outstrms = asoc->stream.outcnt;
4580 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4581 info->sctpi_inqueue++;
4582 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4583 info->sctpi_outqueue++;
4584 info->sctpi_overall_error = asoc->overall_error_count;
4585 info->sctpi_max_burst = asoc->max_burst;
4586 info->sctpi_maxseg = asoc->frag_point;
4587 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4588 info->sctpi_peer_tag = asoc->c.peer_vtag;
4590 mask = asoc->peer.ecn_capable << 1;
4591 mask = (mask | asoc->peer.ipv4_address) << 1;
4592 mask = (mask | asoc->peer.ipv6_address) << 1;
4593 mask = (mask | asoc->peer.hostname_address) << 1;
4594 mask = (mask | asoc->peer.asconf_capable) << 1;
4595 mask = (mask | asoc->peer.prsctp_capable) << 1;
4596 mask = (mask | asoc->peer.auth_capable);
4597 info->sctpi_peer_capable = mask;
4598 mask = asoc->peer.sack_needed << 1;
4599 mask = (mask | asoc->peer.sack_generation) << 1;
4600 mask = (mask | asoc->peer.zero_window_announced);
4601 info->sctpi_peer_sack = mask;
4603 info->sctpi_isacks = asoc->stats.isacks;
4604 info->sctpi_osacks = asoc->stats.osacks;
4605 info->sctpi_opackets = asoc->stats.opackets;
4606 info->sctpi_ipackets = asoc->stats.ipackets;
4607 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4608 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4609 info->sctpi_idupchunks = asoc->stats.idupchunks;
4610 info->sctpi_gapcnt = asoc->stats.gapcnt;
4611 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4612 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4613 info->sctpi_oodchunks = asoc->stats.oodchunks;
4614 info->sctpi_iodchunks = asoc->stats.iodchunks;
4615 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4616 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4618 prim = asoc->peer.primary_path;
4619 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4620 info->sctpi_p_state = prim->state;
4621 info->sctpi_p_cwnd = prim->cwnd;
4622 info->sctpi_p_srtt = prim->srtt;
4623 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4624 info->sctpi_p_hbinterval = prim->hbinterval;
4625 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4626 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4627 info->sctpi_p_ssthresh = prim->ssthresh;
4628 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4629 info->sctpi_p_flight_size = prim->flight_size;
4630 info->sctpi_p_error = prim->error_count;
4634 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4636 /* use callback to avoid exporting the core structure */
4637 int sctp_transport_walk_start(struct rhashtable_iter *iter)
4641 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4643 err = rhashtable_walk_start(iter);
4644 if (err && err != -EAGAIN) {
4645 rhashtable_walk_stop(iter);
4646 rhashtable_walk_exit(iter);
4653 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4655 rhashtable_walk_stop(iter);
4656 rhashtable_walk_exit(iter);
4659 struct sctp_transport *sctp_transport_get_next(struct net *net,
4660 struct rhashtable_iter *iter)
4662 struct sctp_transport *t;
4664 t = rhashtable_walk_next(iter);
4665 for (; t; t = rhashtable_walk_next(iter)) {
4667 if (PTR_ERR(t) == -EAGAIN)
4672 if (!sctp_transport_hold(t))
4675 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4676 t->asoc->peer.primary_path == t)
4679 sctp_transport_put(t);
4685 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4686 struct rhashtable_iter *iter,
4689 struct sctp_transport *t;
4692 return SEQ_START_TOKEN;
4694 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
4697 sctp_transport_put(t);
4703 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4707 struct sctp_ep_common *epb;
4708 struct sctp_hashbucket *head;
4710 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4712 read_lock_bh(&head->lock);
4713 sctp_for_each_hentry(epb, &head->chain) {
4714 err = cb(sctp_ep(epb), p);
4718 read_unlock_bh(&head->lock);
4723 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4725 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4727 const union sctp_addr *laddr,
4728 const union sctp_addr *paddr, void *p)
4730 struct sctp_transport *transport;
4734 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4739 err = cb(transport, p);
4740 sctp_transport_put(transport);
4744 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4746 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
4747 struct net *net, int *pos, void *p)
4749 struct rhashtable_iter hti;
4750 struct sctp_transport *tsp;
4751 struct sctp_endpoint *ep;
4755 ret = sctp_transport_walk_start(&hti);
4759 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
4760 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
4762 if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
4763 ret = cb(ep, tsp, p);
4766 sctp_endpoint_put(ep);
4769 sctp_transport_put(tsp);
4771 sctp_transport_walk_stop(&hti);
4774 if (cb_done && !cb_done(ep, tsp, p)) {
4776 sctp_endpoint_put(ep);
4777 sctp_transport_put(tsp);
4780 sctp_endpoint_put(ep);
4781 sctp_transport_put(tsp);
4786 EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
4788 /* 7.2.1 Association Status (SCTP_STATUS)
4790 * Applications can retrieve current status information about an
4791 * association, including association state, peer receiver window size,
4792 * number of unacked data chunks, and number of data chunks pending
4793 * receipt. This information is read-only.
4795 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4796 char __user *optval,
4799 struct sctp_status status;
4800 struct sctp_association *asoc = NULL;
4801 struct sctp_transport *transport;
4802 sctp_assoc_t associd;
4805 if (len < sizeof(status)) {
4810 len = sizeof(status);
4811 if (copy_from_user(&status, optval, len)) {
4816 associd = status.sstat_assoc_id;
4817 asoc = sctp_id2assoc(sk, associd);
4823 transport = asoc->peer.primary_path;
4825 status.sstat_assoc_id = sctp_assoc2id(asoc);
4826 status.sstat_state = sctp_assoc_to_state(asoc);
4827 status.sstat_rwnd = asoc->peer.rwnd;
4828 status.sstat_unackdata = asoc->unack_data;
4830 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4831 status.sstat_instrms = asoc->stream.incnt;
4832 status.sstat_outstrms = asoc->stream.outcnt;
4833 status.sstat_fragmentation_point = asoc->frag_point;
4834 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4835 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4836 transport->af_specific->sockaddr_len);
4837 /* Map ipv4 address into v4-mapped-on-v6 address. */
4838 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4839 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4840 status.sstat_primary.spinfo_state = transport->state;
4841 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4842 status.sstat_primary.spinfo_srtt = transport->srtt;
4843 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4844 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4846 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4847 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4849 if (put_user(len, optlen)) {
4854 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4855 __func__, len, status.sstat_state, status.sstat_rwnd,
4856 status.sstat_assoc_id);
4858 if (copy_to_user(optval, &status, len)) {
4868 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4870 * Applications can retrieve information about a specific peer address
4871 * of an association, including its reachability state, congestion
4872 * window, and retransmission timer values. This information is
4875 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4876 char __user *optval,
4879 struct sctp_paddrinfo pinfo;
4880 struct sctp_transport *transport;
4883 if (len < sizeof(pinfo)) {
4888 len = sizeof(pinfo);
4889 if (copy_from_user(&pinfo, optval, len)) {
4894 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4895 pinfo.spinfo_assoc_id);
4899 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4900 pinfo.spinfo_state = transport->state;
4901 pinfo.spinfo_cwnd = transport->cwnd;
4902 pinfo.spinfo_srtt = transport->srtt;
4903 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4904 pinfo.spinfo_mtu = transport->pathmtu;
4906 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4907 pinfo.spinfo_state = SCTP_ACTIVE;
4909 if (put_user(len, optlen)) {
4914 if (copy_to_user(optval, &pinfo, len)) {
4923 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4925 * This option is a on/off flag. If enabled no SCTP message
4926 * fragmentation will be performed. Instead if a message being sent
4927 * exceeds the current PMTU size, the message will NOT be sent and
4928 * instead a error will be indicated to the user.
4930 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4931 char __user *optval, int __user *optlen)
4935 if (len < sizeof(int))
4939 val = (sctp_sk(sk)->disable_fragments == 1);
4940 if (put_user(len, optlen))
4942 if (copy_to_user(optval, &val, len))
4947 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4949 * This socket option is used to specify various notifications and
4950 * ancillary data the user wishes to receive.
4952 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4957 if (len > sizeof(struct sctp_event_subscribe))
4958 len = sizeof(struct sctp_event_subscribe);
4959 if (put_user(len, optlen))
4961 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4966 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4968 * This socket option is applicable to the UDP-style socket only. When
4969 * set it will cause associations that are idle for more than the
4970 * specified number of seconds to automatically close. An association
4971 * being idle is defined an association that has NOT sent or received
4972 * user data. The special value of '0' indicates that no automatic
4973 * close of any associations should be performed. The option expects an
4974 * integer defining the number of seconds of idle time before an
4975 * association is closed.
4977 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4979 /* Applicable to UDP-style socket only */
4980 if (sctp_style(sk, TCP))
4982 if (len < sizeof(int))
4985 if (put_user(len, optlen))
4987 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
4992 /* Helper routine to branch off an association to a new socket. */
4993 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4995 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4996 struct sctp_sock *sp = sctp_sk(sk);
4997 struct socket *sock;
5000 /* Do not peel off from one netns to another one. */
5001 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5007 /* An association cannot be branched off from an already peeled-off
5008 * socket, nor is this supported for tcp style sockets.
5010 if (!sctp_style(sk, UDP))
5013 /* Create a new socket. */
5014 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5018 sctp_copy_sock(sock->sk, sk, asoc);
5020 /* Make peeled-off sockets more like 1-1 accepted sockets.
5021 * Set the daddr and initialize id to something more random
5023 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5025 /* Populate the fields of the newsk from the oldsk and migrate the
5026 * asoc to the newsk.
5028 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5034 EXPORT_SYMBOL(sctp_do_peeloff);
5036 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5037 struct file **newfile, unsigned flags)
5039 struct socket *newsock;
5042 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5046 /* Map the socket to an unused fd that can be returned to the user. */
5047 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5049 sock_release(newsock);
5053 *newfile = sock_alloc_file(newsock, 0, NULL);
5054 if (IS_ERR(*newfile)) {
5055 put_unused_fd(retval);
5056 sock_release(newsock);
5057 retval = PTR_ERR(*newfile);
5062 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5065 peeloff->sd = retval;
5067 if (flags & SOCK_NONBLOCK)
5068 (*newfile)->f_flags |= O_NONBLOCK;
5073 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5075 sctp_peeloff_arg_t peeloff;
5076 struct file *newfile = NULL;
5079 if (len < sizeof(sctp_peeloff_arg_t))
5081 len = sizeof(sctp_peeloff_arg_t);
5082 if (copy_from_user(&peeloff, optval, len))
5085 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5089 /* Return the fd mapped to the new socket. */
5090 if (put_user(len, optlen)) {
5092 put_unused_fd(retval);
5096 if (copy_to_user(optval, &peeloff, len)) {
5098 put_unused_fd(retval);
5101 fd_install(retval, newfile);
5106 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5107 char __user *optval, int __user *optlen)
5109 sctp_peeloff_flags_arg_t peeloff;
5110 struct file *newfile = NULL;
5113 if (len < sizeof(sctp_peeloff_flags_arg_t))
5115 len = sizeof(sctp_peeloff_flags_arg_t);
5116 if (copy_from_user(&peeloff, optval, len))
5119 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5120 &newfile, peeloff.flags);
5124 /* Return the fd mapped to the new socket. */
5125 if (put_user(len, optlen)) {
5127 put_unused_fd(retval);
5131 if (copy_to_user(optval, &peeloff, len)) {
5133 put_unused_fd(retval);
5136 fd_install(retval, newfile);
5141 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5143 * Applications can enable or disable heartbeats for any peer address of
5144 * an association, modify an address's heartbeat interval, force a
5145 * heartbeat to be sent immediately, and adjust the address's maximum
5146 * number of retransmissions sent before an address is considered
5147 * unreachable. The following structure is used to access and modify an
5148 * address's parameters:
5150 * struct sctp_paddrparams {
5151 * sctp_assoc_t spp_assoc_id;
5152 * struct sockaddr_storage spp_address;
5153 * uint32_t spp_hbinterval;
5154 * uint16_t spp_pathmaxrxt;
5155 * uint32_t spp_pathmtu;
5156 * uint32_t spp_sackdelay;
5157 * uint32_t spp_flags;
5160 * spp_assoc_id - (one-to-many style socket) This is filled in the
5161 * application, and identifies the association for
5163 * spp_address - This specifies which address is of interest.
5164 * spp_hbinterval - This contains the value of the heartbeat interval,
5165 * in milliseconds. If a value of zero
5166 * is present in this field then no changes are to
5167 * be made to this parameter.
5168 * spp_pathmaxrxt - This contains the maximum number of
5169 * retransmissions before this address shall be
5170 * considered unreachable. If a value of zero
5171 * is present in this field then no changes are to
5172 * be made to this parameter.
5173 * spp_pathmtu - When Path MTU discovery is disabled the value
5174 * specified here will be the "fixed" path mtu.
5175 * Note that if the spp_address field is empty
5176 * then all associations on this address will
5177 * have this fixed path mtu set upon them.
5179 * spp_sackdelay - When delayed sack is enabled, this value specifies
5180 * the number of milliseconds that sacks will be delayed
5181 * for. This value will apply to all addresses of an
5182 * association if the spp_address field is empty. Note
5183 * also, that if delayed sack is enabled and this
5184 * value is set to 0, no change is made to the last
5185 * recorded delayed sack timer value.
5187 * spp_flags - These flags are used to control various features
5188 * on an association. The flag field may contain
5189 * zero or more of the following options.
5191 * SPP_HB_ENABLE - Enable heartbeats on the
5192 * specified address. Note that if the address
5193 * field is empty all addresses for the association
5194 * have heartbeats enabled upon them.
5196 * SPP_HB_DISABLE - Disable heartbeats on the
5197 * speicifed address. Note that if the address
5198 * field is empty all addresses for the association
5199 * will have their heartbeats disabled. Note also
5200 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5201 * mutually exclusive, only one of these two should
5202 * be specified. Enabling both fields will have
5203 * undetermined results.
5205 * SPP_HB_DEMAND - Request a user initiated heartbeat
5206 * to be made immediately.
5208 * SPP_PMTUD_ENABLE - This field will enable PMTU
5209 * discovery upon the specified address. Note that
5210 * if the address feild is empty then all addresses
5211 * on the association are effected.
5213 * SPP_PMTUD_DISABLE - This field will disable PMTU
5214 * discovery upon the specified address. Note that
5215 * if the address feild is empty then all addresses
5216 * on the association are effected. Not also that
5217 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5218 * exclusive. Enabling both will have undetermined
5221 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5222 * on delayed sack. The time specified in spp_sackdelay
5223 * is used to specify the sack delay for this address. Note
5224 * that if spp_address is empty then all addresses will
5225 * enable delayed sack and take on the sack delay
5226 * value specified in spp_sackdelay.
5227 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5228 * off delayed sack. If the spp_address field is blank then
5229 * delayed sack is disabled for the entire association. Note
5230 * also that this field is mutually exclusive to
5231 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5234 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5235 char __user *optval, int __user *optlen)
5237 struct sctp_paddrparams params;
5238 struct sctp_transport *trans = NULL;
5239 struct sctp_association *asoc = NULL;
5240 struct sctp_sock *sp = sctp_sk(sk);
5242 if (len < sizeof(struct sctp_paddrparams))
5244 len = sizeof(struct sctp_paddrparams);
5245 if (copy_from_user(¶ms, optval, len))
5248 /* If an address other than INADDR_ANY is specified, and
5249 * no transport is found, then the request is invalid.
5251 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5252 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5253 params.spp_assoc_id);
5255 pr_debug("%s: failed no transport\n", __func__);
5260 /* Get association, if assoc_id != 0 and the socket is a one
5261 * to many style socket, and an association was not found, then
5262 * the id was invalid.
5264 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5265 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5266 pr_debug("%s: failed no association\n", __func__);
5271 /* Fetch transport values. */
5272 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5273 params.spp_pathmtu = trans->pathmtu;
5274 params.spp_pathmaxrxt = trans->pathmaxrxt;
5275 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5277 /*draft-11 doesn't say what to return in spp_flags*/
5278 params.spp_flags = trans->param_flags;
5280 /* Fetch association values. */
5281 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5282 params.spp_pathmtu = asoc->pathmtu;
5283 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5284 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5286 /*draft-11 doesn't say what to return in spp_flags*/
5287 params.spp_flags = asoc->param_flags;
5289 /* Fetch socket values. */
5290 params.spp_hbinterval = sp->hbinterval;
5291 params.spp_pathmtu = sp->pathmtu;
5292 params.spp_sackdelay = sp->sackdelay;
5293 params.spp_pathmaxrxt = sp->pathmaxrxt;
5295 /*draft-11 doesn't say what to return in spp_flags*/
5296 params.spp_flags = sp->param_flags;
5299 if (copy_to_user(optval, ¶ms, len))
5302 if (put_user(len, optlen))
5309 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5311 * This option will effect the way delayed acks are performed. This
5312 * option allows you to get or set the delayed ack time, in
5313 * milliseconds. It also allows changing the delayed ack frequency.
5314 * Changing the frequency to 1 disables the delayed sack algorithm. If
5315 * the assoc_id is 0, then this sets or gets the endpoints default
5316 * values. If the assoc_id field is non-zero, then the set or get
5317 * effects the specified association for the one to many model (the
5318 * assoc_id field is ignored by the one to one model). Note that if
5319 * sack_delay or sack_freq are 0 when setting this option, then the
5320 * current values will remain unchanged.
5322 * struct sctp_sack_info {
5323 * sctp_assoc_t sack_assoc_id;
5324 * uint32_t sack_delay;
5325 * uint32_t sack_freq;
5328 * sack_assoc_id - This parameter, indicates which association the user
5329 * is performing an action upon. Note that if this field's value is
5330 * zero then the endpoints default value is changed (effecting future
5331 * associations only).
5333 * sack_delay - This parameter contains the number of milliseconds that
5334 * the user is requesting the delayed ACK timer be set to. Note that
5335 * this value is defined in the standard to be between 200 and 500
5338 * sack_freq - This parameter contains the number of packets that must
5339 * be received before a sack is sent without waiting for the delay
5340 * timer to expire. The default value for this is 2, setting this
5341 * value to 1 will disable the delayed sack algorithm.
5343 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5344 char __user *optval,
5347 struct sctp_sack_info params;
5348 struct sctp_association *asoc = NULL;
5349 struct sctp_sock *sp = sctp_sk(sk);
5351 if (len >= sizeof(struct sctp_sack_info)) {
5352 len = sizeof(struct sctp_sack_info);
5354 if (copy_from_user(¶ms, optval, len))
5356 } else if (len == sizeof(struct sctp_assoc_value)) {
5357 pr_warn_ratelimited(DEPRECATED
5359 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5360 "Use struct sctp_sack_info instead\n",
5361 current->comm, task_pid_nr(current));
5362 if (copy_from_user(¶ms, optval, len))
5367 /* Get association, if sack_assoc_id != 0 and the socket is a one
5368 * to many style socket, and an association was not found, then
5369 * the id was invalid.
5371 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5372 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5376 /* Fetch association values. */
5377 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5378 params.sack_delay = jiffies_to_msecs(
5380 params.sack_freq = asoc->sackfreq;
5383 params.sack_delay = 0;
5384 params.sack_freq = 1;
5387 /* Fetch socket values. */
5388 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5389 params.sack_delay = sp->sackdelay;
5390 params.sack_freq = sp->sackfreq;
5392 params.sack_delay = 0;
5393 params.sack_freq = 1;
5397 if (copy_to_user(optval, ¶ms, len))
5400 if (put_user(len, optlen))
5406 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5408 * Applications can specify protocol parameters for the default association
5409 * initialization. The option name argument to setsockopt() and getsockopt()
5412 * Setting initialization parameters is effective only on an unconnected
5413 * socket (for UDP-style sockets only future associations are effected
5414 * by the change). With TCP-style sockets, this option is inherited by
5415 * sockets derived from a listener socket.
5417 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5419 if (len < sizeof(struct sctp_initmsg))
5421 len = sizeof(struct sctp_initmsg);
5422 if (put_user(len, optlen))
5424 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5430 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5431 char __user *optval, int __user *optlen)
5433 struct sctp_association *asoc;
5435 struct sctp_getaddrs getaddrs;
5436 struct sctp_transport *from;
5438 union sctp_addr temp;
5439 struct sctp_sock *sp = sctp_sk(sk);
5444 if (len < sizeof(struct sctp_getaddrs))
5447 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5450 /* For UDP-style sockets, id specifies the association to query. */
5451 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5455 to = optval + offsetof(struct sctp_getaddrs, addrs);
5456 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5458 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5460 memcpy(&temp, &from->ipaddr, sizeof(temp));
5461 addrlen = sctp_get_pf_specific(sk->sk_family)
5462 ->addr_to_user(sp, &temp);
5463 if (space_left < addrlen)
5465 if (copy_to_user(to, &temp, addrlen))
5469 space_left -= addrlen;
5472 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5474 bytes_copied = ((char __user *)to) - optval;
5475 if (put_user(bytes_copied, optlen))
5481 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5482 size_t space_left, int *bytes_copied)
5484 struct sctp_sockaddr_entry *addr;
5485 union sctp_addr temp;
5488 struct net *net = sock_net(sk);
5491 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5495 if ((PF_INET == sk->sk_family) &&
5496 (AF_INET6 == addr->a.sa.sa_family))
5498 if ((PF_INET6 == sk->sk_family) &&
5499 inet_v6_ipv6only(sk) &&
5500 (AF_INET == addr->a.sa.sa_family))
5502 memcpy(&temp, &addr->a, sizeof(temp));
5503 if (!temp.v4.sin_port)
5504 temp.v4.sin_port = htons(port);
5506 addrlen = sctp_get_pf_specific(sk->sk_family)
5507 ->addr_to_user(sctp_sk(sk), &temp);
5509 if (space_left < addrlen) {
5513 memcpy(to, &temp, addrlen);
5517 space_left -= addrlen;
5518 *bytes_copied += addrlen;
5526 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5527 char __user *optval, int __user *optlen)
5529 struct sctp_bind_addr *bp;
5530 struct sctp_association *asoc;
5532 struct sctp_getaddrs getaddrs;
5533 struct sctp_sockaddr_entry *addr;
5535 union sctp_addr temp;
5536 struct sctp_sock *sp = sctp_sk(sk);
5540 int bytes_copied = 0;
5544 if (len < sizeof(struct sctp_getaddrs))
5547 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5551 * For UDP-style sockets, id specifies the association to query.
5552 * If the id field is set to the value '0' then the locally bound
5553 * addresses are returned without regard to any particular
5556 if (0 == getaddrs.assoc_id) {
5557 bp = &sctp_sk(sk)->ep->base.bind_addr;
5559 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5562 bp = &asoc->base.bind_addr;
5565 to = optval + offsetof(struct sctp_getaddrs, addrs);
5566 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5568 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5572 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5573 * addresses from the global local address list.
5575 if (sctp_list_single_entry(&bp->address_list)) {
5576 addr = list_entry(bp->address_list.next,
5577 struct sctp_sockaddr_entry, list);
5578 if (sctp_is_any(sk, &addr->a)) {
5579 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5580 space_left, &bytes_copied);
5590 /* Protection on the bound address list is not needed since
5591 * in the socket option context we hold a socket lock and
5592 * thus the bound address list can't change.
5594 list_for_each_entry(addr, &bp->address_list, list) {
5595 memcpy(&temp, &addr->a, sizeof(temp));
5596 addrlen = sctp_get_pf_specific(sk->sk_family)
5597 ->addr_to_user(sp, &temp);
5598 if (space_left < addrlen) {
5599 err = -ENOMEM; /*fixme: right error?*/
5602 memcpy(buf, &temp, addrlen);
5604 bytes_copied += addrlen;
5606 space_left -= addrlen;
5610 if (copy_to_user(to, addrs, bytes_copied)) {
5614 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5618 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5619 * but we can't change it anymore.
5621 if (put_user(bytes_copied, optlen))
5628 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5630 * Requests that the local SCTP stack use the enclosed peer address as
5631 * the association primary. The enclosed address must be one of the
5632 * association peer's addresses.
5634 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5635 char __user *optval, int __user *optlen)
5637 struct sctp_prim prim;
5638 struct sctp_association *asoc;
5639 struct sctp_sock *sp = sctp_sk(sk);
5641 if (len < sizeof(struct sctp_prim))
5644 len = sizeof(struct sctp_prim);
5646 if (copy_from_user(&prim, optval, len))
5649 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5653 if (!asoc->peer.primary_path)
5656 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5657 asoc->peer.primary_path->af_specific->sockaddr_len);
5659 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5660 (union sctp_addr *)&prim.ssp_addr);
5662 if (put_user(len, optlen))
5664 if (copy_to_user(optval, &prim, len))
5671 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5673 * Requests that the local endpoint set the specified Adaptation Layer
5674 * Indication parameter for all future INIT and INIT-ACK exchanges.
5676 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5677 char __user *optval, int __user *optlen)
5679 struct sctp_setadaptation adaptation;
5681 if (len < sizeof(struct sctp_setadaptation))
5684 len = sizeof(struct sctp_setadaptation);
5686 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5688 if (put_user(len, optlen))
5690 if (copy_to_user(optval, &adaptation, len))
5698 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5700 * Applications that wish to use the sendto() system call may wish to
5701 * specify a default set of parameters that would normally be supplied
5702 * through the inclusion of ancillary data. This socket option allows
5703 * such an application to set the default sctp_sndrcvinfo structure.
5706 * The application that wishes to use this socket option simply passes
5707 * in to this call the sctp_sndrcvinfo structure defined in Section
5708 * 5.2.2) The input parameters accepted by this call include
5709 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5710 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5711 * to this call if the caller is using the UDP model.
5713 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5715 static int sctp_getsockopt_default_send_param(struct sock *sk,
5716 int len, char __user *optval,
5719 struct sctp_sock *sp = sctp_sk(sk);
5720 struct sctp_association *asoc;
5721 struct sctp_sndrcvinfo info;
5723 if (len < sizeof(info))
5728 if (copy_from_user(&info, optval, len))
5731 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5732 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5735 info.sinfo_stream = asoc->default_stream;
5736 info.sinfo_flags = asoc->default_flags;
5737 info.sinfo_ppid = asoc->default_ppid;
5738 info.sinfo_context = asoc->default_context;
5739 info.sinfo_timetolive = asoc->default_timetolive;
5741 info.sinfo_stream = sp->default_stream;
5742 info.sinfo_flags = sp->default_flags;
5743 info.sinfo_ppid = sp->default_ppid;
5744 info.sinfo_context = sp->default_context;
5745 info.sinfo_timetolive = sp->default_timetolive;
5748 if (put_user(len, optlen))
5750 if (copy_to_user(optval, &info, len))
5756 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5757 * (SCTP_DEFAULT_SNDINFO)
5759 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5760 char __user *optval,
5763 struct sctp_sock *sp = sctp_sk(sk);
5764 struct sctp_association *asoc;
5765 struct sctp_sndinfo info;
5767 if (len < sizeof(info))
5772 if (copy_from_user(&info, optval, len))
5775 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5776 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5779 info.snd_sid = asoc->default_stream;
5780 info.snd_flags = asoc->default_flags;
5781 info.snd_ppid = asoc->default_ppid;
5782 info.snd_context = asoc->default_context;
5784 info.snd_sid = sp->default_stream;
5785 info.snd_flags = sp->default_flags;
5786 info.snd_ppid = sp->default_ppid;
5787 info.snd_context = sp->default_context;
5790 if (put_user(len, optlen))
5792 if (copy_to_user(optval, &info, len))
5800 * 7.1.5 SCTP_NODELAY
5802 * Turn on/off any Nagle-like algorithm. This means that packets are
5803 * generally sent as soon as possible and no unnecessary delays are
5804 * introduced, at the cost of more packets in the network. Expects an
5805 * integer boolean flag.
5808 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5809 char __user *optval, int __user *optlen)
5813 if (len < sizeof(int))
5817 val = (sctp_sk(sk)->nodelay == 1);
5818 if (put_user(len, optlen))
5820 if (copy_to_user(optval, &val, len))
5827 * 7.1.1 SCTP_RTOINFO
5829 * The protocol parameters used to initialize and bound retransmission
5830 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5831 * and modify these parameters.
5832 * All parameters are time values, in milliseconds. A value of 0, when
5833 * modifying the parameters, indicates that the current value should not
5837 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5838 char __user *optval,
5839 int __user *optlen) {
5840 struct sctp_rtoinfo rtoinfo;
5841 struct sctp_association *asoc;
5843 if (len < sizeof (struct sctp_rtoinfo))
5846 len = sizeof(struct sctp_rtoinfo);
5848 if (copy_from_user(&rtoinfo, optval, len))
5851 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5853 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5856 /* Values corresponding to the specific association. */
5858 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5859 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5860 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5862 /* Values corresponding to the endpoint. */
5863 struct sctp_sock *sp = sctp_sk(sk);
5865 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5866 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5867 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5870 if (put_user(len, optlen))
5873 if (copy_to_user(optval, &rtoinfo, len))
5881 * 7.1.2 SCTP_ASSOCINFO
5883 * This option is used to tune the maximum retransmission attempts
5884 * of the association.
5885 * Returns an error if the new association retransmission value is
5886 * greater than the sum of the retransmission value of the peer.
5887 * See [SCTP] for more information.
5890 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5891 char __user *optval,
5895 struct sctp_assocparams assocparams;
5896 struct sctp_association *asoc;
5897 struct list_head *pos;
5900 if (len < sizeof (struct sctp_assocparams))
5903 len = sizeof(struct sctp_assocparams);
5905 if (copy_from_user(&assocparams, optval, len))
5908 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5910 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5913 /* Values correspoinding to the specific association */
5915 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5916 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5917 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5918 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5920 list_for_each(pos, &asoc->peer.transport_addr_list) {
5924 assocparams.sasoc_number_peer_destinations = cnt;
5926 /* Values corresponding to the endpoint */
5927 struct sctp_sock *sp = sctp_sk(sk);
5929 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5930 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5931 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5932 assocparams.sasoc_cookie_life =
5933 sp->assocparams.sasoc_cookie_life;
5934 assocparams.sasoc_number_peer_destinations =
5936 sasoc_number_peer_destinations;
5939 if (put_user(len, optlen))
5942 if (copy_to_user(optval, &assocparams, len))
5949 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5951 * This socket option is a boolean flag which turns on or off mapped V4
5952 * addresses. If this option is turned on and the socket is type
5953 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5954 * If this option is turned off, then no mapping will be done of V4
5955 * addresses and a user will receive both PF_INET6 and PF_INET type
5956 * addresses on the socket.
5958 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5959 char __user *optval, int __user *optlen)
5962 struct sctp_sock *sp = sctp_sk(sk);
5964 if (len < sizeof(int))
5969 if (put_user(len, optlen))
5971 if (copy_to_user(optval, &val, len))
5978 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5979 * (chapter and verse is quoted at sctp_setsockopt_context())
5981 static int sctp_getsockopt_context(struct sock *sk, int len,
5982 char __user *optval, int __user *optlen)
5984 struct sctp_assoc_value params;
5985 struct sctp_sock *sp;
5986 struct sctp_association *asoc;
5988 if (len < sizeof(struct sctp_assoc_value))
5991 len = sizeof(struct sctp_assoc_value);
5993 if (copy_from_user(¶ms, optval, len))
5998 if (params.assoc_id != 0) {
5999 asoc = sctp_id2assoc(sk, params.assoc_id);
6002 params.assoc_value = asoc->default_rcv_context;
6004 params.assoc_value = sp->default_rcv_context;
6007 if (put_user(len, optlen))
6009 if (copy_to_user(optval, ¶ms, len))
6016 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6017 * This option will get or set the maximum size to put in any outgoing
6018 * SCTP DATA chunk. If a message is larger than this size it will be
6019 * fragmented by SCTP into the specified size. Note that the underlying
6020 * SCTP implementation may fragment into smaller sized chunks when the
6021 * PMTU of the underlying association is smaller than the value set by
6022 * the user. The default value for this option is '0' which indicates
6023 * the user is NOT limiting fragmentation and only the PMTU will effect
6024 * SCTP's choice of DATA chunk size. Note also that values set larger
6025 * than the maximum size of an IP datagram will effectively let SCTP
6026 * control fragmentation (i.e. the same as setting this option to 0).
6028 * The following structure is used to access and modify this parameter:
6030 * struct sctp_assoc_value {
6031 * sctp_assoc_t assoc_id;
6032 * uint32_t assoc_value;
6035 * assoc_id: This parameter is ignored for one-to-one style sockets.
6036 * For one-to-many style sockets this parameter indicates which
6037 * association the user is performing an action upon. Note that if
6038 * this field's value is zero then the endpoints default value is
6039 * changed (effecting future associations only).
6040 * assoc_value: This parameter specifies the maximum size in bytes.
6042 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6043 char __user *optval, int __user *optlen)
6045 struct sctp_assoc_value params;
6046 struct sctp_association *asoc;
6048 if (len == sizeof(int)) {
6049 pr_warn_ratelimited(DEPRECATED
6051 "Use of int in maxseg socket option.\n"
6052 "Use struct sctp_assoc_value instead\n",
6053 current->comm, task_pid_nr(current));
6054 params.assoc_id = 0;
6055 } else if (len >= sizeof(struct sctp_assoc_value)) {
6056 len = sizeof(struct sctp_assoc_value);
6057 if (copy_from_user(¶ms, optval, len))
6062 asoc = sctp_id2assoc(sk, params.assoc_id);
6063 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6067 params.assoc_value = asoc->frag_point;
6069 params.assoc_value = sctp_sk(sk)->user_frag;
6071 if (put_user(len, optlen))
6073 if (len == sizeof(int)) {
6074 if (copy_to_user(optval, ¶ms.assoc_value, len))
6077 if (copy_to_user(optval, ¶ms, len))
6085 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6086 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6088 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6089 char __user *optval, int __user *optlen)
6093 if (len < sizeof(int))
6098 val = sctp_sk(sk)->frag_interleave;
6099 if (put_user(len, optlen))
6101 if (copy_to_user(optval, &val, len))
6108 * 7.1.25. Set or Get the sctp partial delivery point
6109 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6111 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6112 char __user *optval,
6117 if (len < sizeof(u32))
6122 val = sctp_sk(sk)->pd_point;
6123 if (put_user(len, optlen))
6125 if (copy_to_user(optval, &val, len))
6132 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6133 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6135 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6136 char __user *optval,
6139 struct sctp_assoc_value params;
6140 struct sctp_sock *sp;
6141 struct sctp_association *asoc;
6143 if (len == sizeof(int)) {
6144 pr_warn_ratelimited(DEPRECATED
6146 "Use of int in max_burst socket option.\n"
6147 "Use struct sctp_assoc_value instead\n",
6148 current->comm, task_pid_nr(current));
6149 params.assoc_id = 0;
6150 } else if (len >= sizeof(struct sctp_assoc_value)) {
6151 len = sizeof(struct sctp_assoc_value);
6152 if (copy_from_user(¶ms, optval, len))
6159 if (params.assoc_id != 0) {
6160 asoc = sctp_id2assoc(sk, params.assoc_id);
6163 params.assoc_value = asoc->max_burst;
6165 params.assoc_value = sp->max_burst;
6167 if (len == sizeof(int)) {
6168 if (copy_to_user(optval, ¶ms.assoc_value, len))
6171 if (copy_to_user(optval, ¶ms, len))
6179 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6180 char __user *optval, int __user *optlen)
6182 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6183 struct sctp_hmacalgo __user *p = (void __user *)optval;
6184 struct sctp_hmac_algo_param *hmacs;
6189 if (!ep->auth_enable)
6192 hmacs = ep->auth_hmacs_list;
6193 data_len = ntohs(hmacs->param_hdr.length) -
6194 sizeof(struct sctp_paramhdr);
6196 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6199 len = sizeof(struct sctp_hmacalgo) + data_len;
6200 num_idents = data_len / sizeof(u16);
6202 if (put_user(len, optlen))
6204 if (put_user(num_idents, &p->shmac_num_idents))
6206 for (i = 0; i < num_idents; i++) {
6207 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6209 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6215 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6216 char __user *optval, int __user *optlen)
6218 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6219 struct sctp_authkeyid val;
6220 struct sctp_association *asoc;
6222 if (!ep->auth_enable)
6225 if (len < sizeof(struct sctp_authkeyid))
6228 len = sizeof(struct sctp_authkeyid);
6229 if (copy_from_user(&val, optval, len))
6232 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6233 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6237 val.scact_keynumber = asoc->active_key_id;
6239 val.scact_keynumber = ep->active_key_id;
6241 if (put_user(len, optlen))
6243 if (copy_to_user(optval, &val, len))
6249 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6250 char __user *optval, int __user *optlen)
6252 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6253 struct sctp_authchunks __user *p = (void __user *)optval;
6254 struct sctp_authchunks val;
6255 struct sctp_association *asoc;
6256 struct sctp_chunks_param *ch;
6260 if (!ep->auth_enable)
6263 if (len < sizeof(struct sctp_authchunks))
6266 if (copy_from_user(&val, optval, sizeof(val)))
6269 to = p->gauth_chunks;
6270 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6274 ch = asoc->peer.peer_chunks;
6278 /* See if the user provided enough room for all the data */
6279 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6280 if (len < num_chunks)
6283 if (copy_to_user(to, ch->chunks, num_chunks))
6286 len = sizeof(struct sctp_authchunks) + num_chunks;
6287 if (put_user(len, optlen))
6289 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6294 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6295 char __user *optval, int __user *optlen)
6297 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6298 struct sctp_authchunks __user *p = (void __user *)optval;
6299 struct sctp_authchunks val;
6300 struct sctp_association *asoc;
6301 struct sctp_chunks_param *ch;
6305 if (!ep->auth_enable)
6308 if (len < sizeof(struct sctp_authchunks))
6311 if (copy_from_user(&val, optval, sizeof(val)))
6314 to = p->gauth_chunks;
6315 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6316 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6320 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6322 ch = ep->auth_chunk_list;
6327 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6328 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6331 if (copy_to_user(to, ch->chunks, num_chunks))
6334 len = sizeof(struct sctp_authchunks) + num_chunks;
6335 if (put_user(len, optlen))
6337 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6344 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6345 * This option gets the current number of associations that are attached
6346 * to a one-to-many style socket. The option value is an uint32_t.
6348 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6349 char __user *optval, int __user *optlen)
6351 struct sctp_sock *sp = sctp_sk(sk);
6352 struct sctp_association *asoc;
6355 if (sctp_style(sk, TCP))
6358 if (len < sizeof(u32))
6363 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6367 if (put_user(len, optlen))
6369 if (copy_to_user(optval, &val, len))
6376 * 8.1.23 SCTP_AUTO_ASCONF
6377 * See the corresponding setsockopt entry as description
6379 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6380 char __user *optval, int __user *optlen)
6384 if (len < sizeof(int))
6388 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6390 if (put_user(len, optlen))
6392 if (copy_to_user(optval, &val, len))
6398 * 8.2.6. Get the Current Identifiers of Associations
6399 * (SCTP_GET_ASSOC_ID_LIST)
6401 * This option gets the current list of SCTP association identifiers of
6402 * the SCTP associations handled by a one-to-many style socket.
6404 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6405 char __user *optval, int __user *optlen)
6407 struct sctp_sock *sp = sctp_sk(sk);
6408 struct sctp_association *asoc;
6409 struct sctp_assoc_ids *ids;
6412 if (sctp_style(sk, TCP))
6415 if (len < sizeof(struct sctp_assoc_ids))
6418 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6422 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6425 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6427 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6431 ids->gaids_number_of_ids = num;
6433 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6434 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6437 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6447 * SCTP_PEER_ADDR_THLDS
6449 * This option allows us to fetch the partially failed threshold for one or all
6450 * transports in an association. See Section 6.1 of:
6451 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6453 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6454 char __user *optval,
6458 struct sctp_paddrthlds val;
6459 struct sctp_transport *trans;
6460 struct sctp_association *asoc;
6462 if (len < sizeof(struct sctp_paddrthlds))
6464 len = sizeof(struct sctp_paddrthlds);
6465 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6468 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6469 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6473 val.spt_pathpfthld = asoc->pf_retrans;
6474 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6476 trans = sctp_addr_id2transport(sk, &val.spt_address,
6481 val.spt_pathmaxrxt = trans->pathmaxrxt;
6482 val.spt_pathpfthld = trans->pf_retrans;
6485 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6492 * SCTP_GET_ASSOC_STATS
6494 * This option retrieves local per endpoint statistics. It is modeled
6495 * after OpenSolaris' implementation
6497 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6498 char __user *optval,
6501 struct sctp_assoc_stats sas;
6502 struct sctp_association *asoc = NULL;
6504 /* User must provide at least the assoc id */
6505 if (len < sizeof(sctp_assoc_t))
6508 /* Allow the struct to grow and fill in as much as possible */
6509 len = min_t(size_t, len, sizeof(sas));
6511 if (copy_from_user(&sas, optval, len))
6514 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6518 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6519 sas.sas_gapcnt = asoc->stats.gapcnt;
6520 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6521 sas.sas_osacks = asoc->stats.osacks;
6522 sas.sas_isacks = asoc->stats.isacks;
6523 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6524 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6525 sas.sas_oodchunks = asoc->stats.oodchunks;
6526 sas.sas_iodchunks = asoc->stats.iodchunks;
6527 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6528 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6529 sas.sas_idupchunks = asoc->stats.idupchunks;
6530 sas.sas_opackets = asoc->stats.opackets;
6531 sas.sas_ipackets = asoc->stats.ipackets;
6533 /* New high max rto observed, will return 0 if not a single
6534 * RTO update took place. obs_rto_ipaddr will be bogus
6537 sas.sas_maxrto = asoc->stats.max_obs_rto;
6538 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6539 sizeof(struct sockaddr_storage));
6541 /* Mark beginning of a new observation period */
6542 asoc->stats.max_obs_rto = asoc->rto_min;
6544 if (put_user(len, optlen))
6547 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6549 if (copy_to_user(optval, &sas, len))
6555 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6556 char __user *optval,
6561 if (len < sizeof(int))
6565 if (sctp_sk(sk)->recvrcvinfo)
6567 if (put_user(len, optlen))
6569 if (copy_to_user(optval, &val, len))
6575 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6576 char __user *optval,
6581 if (len < sizeof(int))
6585 if (sctp_sk(sk)->recvnxtinfo)
6587 if (put_user(len, optlen))
6589 if (copy_to_user(optval, &val, len))
6595 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6596 char __user *optval,
6599 struct sctp_assoc_value params;
6600 struct sctp_association *asoc;
6601 int retval = -EFAULT;
6603 if (len < sizeof(params)) {
6608 len = sizeof(params);
6609 if (copy_from_user(¶ms, optval, len))
6612 asoc = sctp_id2assoc(sk, params.assoc_id);
6614 params.assoc_value = asoc->prsctp_enable;
6615 } else if (!params.assoc_id) {
6616 struct sctp_sock *sp = sctp_sk(sk);
6618 params.assoc_value = sp->ep->prsctp_enable;
6624 if (put_user(len, optlen))
6627 if (copy_to_user(optval, ¶ms, len))
6636 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6637 char __user *optval,
6640 struct sctp_default_prinfo info;
6641 struct sctp_association *asoc;
6642 int retval = -EFAULT;
6644 if (len < sizeof(info)) {
6650 if (copy_from_user(&info, optval, len))
6653 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6655 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6656 info.pr_value = asoc->default_timetolive;
6657 } else if (!info.pr_assoc_id) {
6658 struct sctp_sock *sp = sctp_sk(sk);
6660 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6661 info.pr_value = sp->default_timetolive;
6667 if (put_user(len, optlen))
6670 if (copy_to_user(optval, &info, len))
6679 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6680 char __user *optval,
6683 struct sctp_prstatus params;
6684 struct sctp_association *asoc;
6686 int retval = -EINVAL;
6688 if (len < sizeof(params))
6691 len = sizeof(params);
6692 if (copy_from_user(¶ms, optval, len)) {
6697 policy = params.sprstat_policy;
6698 if (policy & ~SCTP_PR_SCTP_MASK)
6701 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6705 if (policy == SCTP_PR_SCTP_NONE) {
6706 params.sprstat_abandoned_unsent = 0;
6707 params.sprstat_abandoned_sent = 0;
6708 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6709 params.sprstat_abandoned_unsent +=
6710 asoc->abandoned_unsent[policy];
6711 params.sprstat_abandoned_sent +=
6712 asoc->abandoned_sent[policy];
6715 params.sprstat_abandoned_unsent =
6716 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6717 params.sprstat_abandoned_sent =
6718 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6721 if (put_user(len, optlen)) {
6726 if (copy_to_user(optval, ¶ms, len)) {
6737 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
6738 char __user *optval,
6741 struct sctp_stream_out *streamout;
6742 struct sctp_association *asoc;
6743 struct sctp_prstatus params;
6744 int retval = -EINVAL;
6747 if (len < sizeof(params))
6750 len = sizeof(params);
6751 if (copy_from_user(¶ms, optval, len)) {
6756 policy = params.sprstat_policy;
6757 if (policy & ~SCTP_PR_SCTP_MASK)
6760 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6761 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6764 streamout = &asoc->stream.out[params.sprstat_sid];
6765 if (policy == SCTP_PR_SCTP_NONE) {
6766 params.sprstat_abandoned_unsent = 0;
6767 params.sprstat_abandoned_sent = 0;
6768 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6769 params.sprstat_abandoned_unsent +=
6770 streamout->abandoned_unsent[policy];
6771 params.sprstat_abandoned_sent +=
6772 streamout->abandoned_sent[policy];
6775 params.sprstat_abandoned_unsent =
6776 streamout->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6777 params.sprstat_abandoned_sent =
6778 streamout->abandoned_sent[__SCTP_PR_INDEX(policy)];
6781 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
6792 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
6793 char __user *optval,
6796 struct sctp_assoc_value params;
6797 struct sctp_association *asoc;
6798 int retval = -EFAULT;
6800 if (len < sizeof(params)) {
6805 len = sizeof(params);
6806 if (copy_from_user(¶ms, optval, len))
6809 asoc = sctp_id2assoc(sk, params.assoc_id);
6811 params.assoc_value = asoc->reconf_enable;
6812 } else if (!params.assoc_id) {
6813 struct sctp_sock *sp = sctp_sk(sk);
6815 params.assoc_value = sp->ep->reconf_enable;
6821 if (put_user(len, optlen))
6824 if (copy_to_user(optval, ¶ms, len))
6833 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
6834 char __user *optval,
6837 struct sctp_assoc_value params;
6838 struct sctp_association *asoc;
6839 int retval = -EFAULT;
6841 if (len < sizeof(params)) {
6846 len = sizeof(params);
6847 if (copy_from_user(¶ms, optval, len))
6850 asoc = sctp_id2assoc(sk, params.assoc_id);
6852 params.assoc_value = asoc->strreset_enable;
6853 } else if (!params.assoc_id) {
6854 struct sctp_sock *sp = sctp_sk(sk);
6856 params.assoc_value = sp->ep->strreset_enable;
6862 if (put_user(len, optlen))
6865 if (copy_to_user(optval, ¶ms, len))
6874 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6875 char __user *optval, int __user *optlen)
6880 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6882 /* I can hardly begin to describe how wrong this is. This is
6883 * so broken as to be worse than useless. The API draft
6884 * REALLY is NOT helpful here... I am not convinced that the
6885 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6886 * are at all well-founded.
6888 if (level != SOL_SCTP) {
6889 struct sctp_af *af = sctp_sk(sk)->pf->af;
6891 retval = af->getsockopt(sk, level, optname, optval, optlen);
6895 if (get_user(len, optlen))
6905 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6907 case SCTP_DISABLE_FRAGMENTS:
6908 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6912 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6914 case SCTP_AUTOCLOSE:
6915 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6917 case SCTP_SOCKOPT_PEELOFF:
6918 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6920 case SCTP_SOCKOPT_PEELOFF_FLAGS:
6921 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
6923 case SCTP_PEER_ADDR_PARAMS:
6924 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6927 case SCTP_DELAYED_SACK:
6928 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6932 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6934 case SCTP_GET_PEER_ADDRS:
6935 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6938 case SCTP_GET_LOCAL_ADDRS:
6939 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6942 case SCTP_SOCKOPT_CONNECTX3:
6943 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6945 case SCTP_DEFAULT_SEND_PARAM:
6946 retval = sctp_getsockopt_default_send_param(sk, len,
6949 case SCTP_DEFAULT_SNDINFO:
6950 retval = sctp_getsockopt_default_sndinfo(sk, len,
6953 case SCTP_PRIMARY_ADDR:
6954 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6957 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6960 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6962 case SCTP_ASSOCINFO:
6963 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6965 case SCTP_I_WANT_MAPPED_V4_ADDR:
6966 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6969 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6971 case SCTP_GET_PEER_ADDR_INFO:
6972 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6975 case SCTP_ADAPTATION_LAYER:
6976 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6980 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6982 case SCTP_FRAGMENT_INTERLEAVE:
6983 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6986 case SCTP_PARTIAL_DELIVERY_POINT:
6987 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6990 case SCTP_MAX_BURST:
6991 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6994 case SCTP_AUTH_CHUNK:
6995 case SCTP_AUTH_DELETE_KEY:
6996 retval = -EOPNOTSUPP;
6998 case SCTP_HMAC_IDENT:
6999 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7001 case SCTP_AUTH_ACTIVE_KEY:
7002 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7004 case SCTP_PEER_AUTH_CHUNKS:
7005 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7008 case SCTP_LOCAL_AUTH_CHUNKS:
7009 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7012 case SCTP_GET_ASSOC_NUMBER:
7013 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7015 case SCTP_GET_ASSOC_ID_LIST:
7016 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7018 case SCTP_AUTO_ASCONF:
7019 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7021 case SCTP_PEER_ADDR_THLDS:
7022 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7024 case SCTP_GET_ASSOC_STATS:
7025 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7027 case SCTP_RECVRCVINFO:
7028 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7030 case SCTP_RECVNXTINFO:
7031 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7033 case SCTP_PR_SUPPORTED:
7034 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7036 case SCTP_DEFAULT_PRINFO:
7037 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7040 case SCTP_PR_ASSOC_STATUS:
7041 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7044 case SCTP_PR_STREAM_STATUS:
7045 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7048 case SCTP_RECONFIG_SUPPORTED:
7049 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7052 case SCTP_ENABLE_STREAM_RESET:
7053 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7057 retval = -ENOPROTOOPT;
7065 static int sctp_hash(struct sock *sk)
7071 static void sctp_unhash(struct sock *sk)
7076 /* Check if port is acceptable. Possibly find first available port.
7078 * The port hash table (contained in the 'global' SCTP protocol storage
7079 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7080 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7081 * list (the list number is the port number hashed out, so as you
7082 * would expect from a hash function, all the ports in a given list have
7083 * such a number that hashes out to the same list number; you were
7084 * expecting that, right?); so each list has a set of ports, with a
7085 * link to the socket (struct sock) that uses it, the port number and
7086 * a fastreuse flag (FIXME: NPI ipg).
7088 static struct sctp_bind_bucket *sctp_bucket_create(
7089 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7091 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7093 struct sctp_bind_hashbucket *head; /* hash list */
7094 struct sctp_bind_bucket *pp;
7095 unsigned short snum;
7098 snum = ntohs(addr->v4.sin_port);
7100 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7103 /* Search for an available port. */
7104 int low, high, remaining, index;
7106 struct net *net = sock_net(sk);
7108 inet_get_local_port_range(net, &low, &high);
7109 remaining = (high - low) + 1;
7110 rover = prandom_u32() % remaining + low;
7114 if ((rover < low) || (rover > high))
7116 if (inet_is_local_reserved_port(net, rover))
7118 index = sctp_phashfn(sock_net(sk), rover);
7119 head = &sctp_port_hashtable[index];
7120 spin_lock_bh(&head->lock);
7121 sctp_for_each_hentry(pp, &head->chain)
7122 if ((pp->port == rover) &&
7123 net_eq(sock_net(sk), pp->net))
7127 spin_unlock_bh(&head->lock);
7129 } while (--remaining > 0);
7131 /* Exhausted local port range during search? */
7136 /* OK, here is the one we will use. HEAD (the port
7137 * hash table list entry) is non-NULL and we hold it's
7142 /* We are given an specific port number; we verify
7143 * that it is not being used. If it is used, we will
7144 * exahust the search in the hash list corresponding
7145 * to the port number (snum) - we detect that with the
7146 * port iterator, pp being NULL.
7148 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7149 spin_lock_bh(&head->lock);
7150 sctp_for_each_hentry(pp, &head->chain) {
7151 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7158 if (!hlist_empty(&pp->owner)) {
7159 /* We had a port hash table hit - there is an
7160 * available port (pp != NULL) and it is being
7161 * used by other socket (pp->owner not empty); that other
7162 * socket is going to be sk2.
7164 int reuse = sk->sk_reuse;
7167 pr_debug("%s: found a possible match\n", __func__);
7169 if (pp->fastreuse && sk->sk_reuse &&
7170 sk->sk_state != SCTP_SS_LISTENING)
7173 /* Run through the list of sockets bound to the port
7174 * (pp->port) [via the pointers bind_next and
7175 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7176 * we get the endpoint they describe and run through
7177 * the endpoint's list of IP (v4 or v6) addresses,
7178 * comparing each of the addresses with the address of
7179 * the socket sk. If we find a match, then that means
7180 * that this port/socket (sk) combination are already
7183 sk_for_each_bound(sk2, &pp->owner) {
7184 struct sctp_endpoint *ep2;
7185 ep2 = sctp_sk(sk2)->ep;
7188 (reuse && sk2->sk_reuse &&
7189 sk2->sk_state != SCTP_SS_LISTENING))
7192 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7193 sctp_sk(sk2), sctp_sk(sk))) {
7199 pr_debug("%s: found a match\n", __func__);
7202 /* If there was a hash table miss, create a new port. */
7204 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7207 /* In either case (hit or miss), make sure fastreuse is 1 only
7208 * if sk->sk_reuse is too (that is, if the caller requested
7209 * SO_REUSEADDR on this socket -sk-).
7211 if (hlist_empty(&pp->owner)) {
7212 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
7216 } else if (pp->fastreuse &&
7217 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
7220 /* We are set, so fill up all the data in the hash table
7221 * entry, tie the socket list information with the rest of the
7222 * sockets FIXME: Blurry, NPI (ipg).
7225 if (!sctp_sk(sk)->bind_hash) {
7226 inet_sk(sk)->inet_num = snum;
7227 sk_add_bind_node(sk, &pp->owner);
7228 sctp_sk(sk)->bind_hash = pp;
7233 spin_unlock_bh(&head->lock);
7237 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7238 * port is requested.
7240 static int sctp_get_port(struct sock *sk, unsigned short snum)
7242 union sctp_addr addr;
7243 struct sctp_af *af = sctp_sk(sk)->pf->af;
7245 /* Set up a dummy address struct from the sk. */
7246 af->from_sk(&addr, sk);
7247 addr.v4.sin_port = htons(snum);
7249 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7250 return !!sctp_get_port_local(sk, &addr);
7254 * Move a socket to LISTENING state.
7256 static int sctp_listen_start(struct sock *sk, int backlog)
7258 struct sctp_sock *sp = sctp_sk(sk);
7259 struct sctp_endpoint *ep = sp->ep;
7260 struct crypto_shash *tfm = NULL;
7263 /* Allocate HMAC for generating cookie. */
7264 if (!sp->hmac && sp->sctp_hmac_alg) {
7265 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7266 tfm = crypto_alloc_shash(alg, 0, 0);
7268 net_info_ratelimited("failed to load transform for %s: %ld\n",
7269 sp->sctp_hmac_alg, PTR_ERR(tfm));
7272 sctp_sk(sk)->hmac = tfm;
7276 * If a bind() or sctp_bindx() is not called prior to a listen()
7277 * call that allows new associations to be accepted, the system
7278 * picks an ephemeral port and will choose an address set equivalent
7279 * to binding with a wildcard address.
7281 * This is not currently spelled out in the SCTP sockets
7282 * extensions draft, but follows the practice as seen in TCP
7286 sk->sk_state = SCTP_SS_LISTENING;
7287 if (!ep->base.bind_addr.port) {
7288 if (sctp_autobind(sk))
7291 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7292 sk->sk_state = SCTP_SS_CLOSED;
7297 sk->sk_max_ack_backlog = backlog;
7298 sctp_hash_endpoint(ep);
7303 * 4.1.3 / 5.1.3 listen()
7305 * By default, new associations are not accepted for UDP style sockets.
7306 * An application uses listen() to mark a socket as being able to
7307 * accept new associations.
7309 * On TCP style sockets, applications use listen() to ready the SCTP
7310 * endpoint for accepting inbound associations.
7312 * On both types of endpoints a backlog of '0' disables listening.
7314 * Move a socket to LISTENING state.
7316 int sctp_inet_listen(struct socket *sock, int backlog)
7318 struct sock *sk = sock->sk;
7319 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7322 if (unlikely(backlog < 0))
7327 /* Peeled-off sockets are not allowed to listen(). */
7328 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7331 if (sock->state != SS_UNCONNECTED)
7334 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7337 /* If backlog is zero, disable listening. */
7339 if (sctp_sstate(sk, CLOSED))
7343 sctp_unhash_endpoint(ep);
7344 sk->sk_state = SCTP_SS_CLOSED;
7346 sctp_sk(sk)->bind_hash->fastreuse = 1;
7350 /* If we are already listening, just update the backlog */
7351 if (sctp_sstate(sk, LISTENING))
7352 sk->sk_max_ack_backlog = backlog;
7354 err = sctp_listen_start(sk, backlog);
7366 * This function is done by modeling the current datagram_poll() and the
7367 * tcp_poll(). Note that, based on these implementations, we don't
7368 * lock the socket in this function, even though it seems that,
7369 * ideally, locking or some other mechanisms can be used to ensure
7370 * the integrity of the counters (sndbuf and wmem_alloc) used
7371 * in this place. We assume that we don't need locks either until proven
7374 * Another thing to note is that we include the Async I/O support
7375 * here, again, by modeling the current TCP/UDP code. We don't have
7376 * a good way to test with it yet.
7378 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7380 struct sock *sk = sock->sk;
7381 struct sctp_sock *sp = sctp_sk(sk);
7384 poll_wait(file, sk_sleep(sk), wait);
7386 sock_rps_record_flow(sk);
7388 /* A TCP-style listening socket becomes readable when the accept queue
7391 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7392 return (!list_empty(&sp->ep->asocs)) ?
7393 (POLLIN | POLLRDNORM) : 0;
7397 /* Is there any exceptional events? */
7398 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
7400 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
7401 if (sk->sk_shutdown & RCV_SHUTDOWN)
7402 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
7403 if (sk->sk_shutdown == SHUTDOWN_MASK)
7406 /* Is it readable? Reconsider this code with TCP-style support. */
7407 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
7408 mask |= POLLIN | POLLRDNORM;
7410 /* The association is either gone or not ready. */
7411 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7414 /* Is it writable? */
7415 if (sctp_writeable(sk)) {
7416 mask |= POLLOUT | POLLWRNORM;
7418 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7420 * Since the socket is not locked, the buffer
7421 * might be made available after the writeable check and
7422 * before the bit is set. This could cause a lost I/O
7423 * signal. tcp_poll() has a race breaker for this race
7424 * condition. Based on their implementation, we put
7425 * in the following code to cover it as well.
7427 if (sctp_writeable(sk))
7428 mask |= POLLOUT | POLLWRNORM;
7433 /********************************************************************
7434 * 2nd Level Abstractions
7435 ********************************************************************/
7437 static struct sctp_bind_bucket *sctp_bucket_create(
7438 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
7440 struct sctp_bind_bucket *pp;
7442 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
7444 SCTP_DBG_OBJCNT_INC(bind_bucket);
7447 INIT_HLIST_HEAD(&pp->owner);
7449 hlist_add_head(&pp->node, &head->chain);
7454 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7455 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7457 if (pp && hlist_empty(&pp->owner)) {
7458 __hlist_del(&pp->node);
7459 kmem_cache_free(sctp_bucket_cachep, pp);
7460 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7464 /* Release this socket's reference to a local port. */
7465 static inline void __sctp_put_port(struct sock *sk)
7467 struct sctp_bind_hashbucket *head =
7468 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7469 inet_sk(sk)->inet_num)];
7470 struct sctp_bind_bucket *pp;
7472 spin_lock(&head->lock);
7473 pp = sctp_sk(sk)->bind_hash;
7474 __sk_del_bind_node(sk);
7475 sctp_sk(sk)->bind_hash = NULL;
7476 inet_sk(sk)->inet_num = 0;
7477 sctp_bucket_destroy(pp);
7478 spin_unlock(&head->lock);
7481 void sctp_put_port(struct sock *sk)
7484 __sctp_put_port(sk);
7489 * The system picks an ephemeral port and choose an address set equivalent
7490 * to binding with a wildcard address.
7491 * One of those addresses will be the primary address for the association.
7492 * This automatically enables the multihoming capability of SCTP.
7494 static int sctp_autobind(struct sock *sk)
7496 union sctp_addr autoaddr;
7500 /* Initialize a local sockaddr structure to INADDR_ANY. */
7501 af = sctp_sk(sk)->pf->af;
7503 port = htons(inet_sk(sk)->inet_num);
7504 af->inaddr_any(&autoaddr, port);
7506 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7509 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7512 * 4.2 The cmsghdr Structure *
7514 * When ancillary data is sent or received, any number of ancillary data
7515 * objects can be specified by the msg_control and msg_controllen members of
7516 * the msghdr structure, because each object is preceded by
7517 * a cmsghdr structure defining the object's length (the cmsg_len member).
7518 * Historically Berkeley-derived implementations have passed only one object
7519 * at a time, but this API allows multiple objects to be
7520 * passed in a single call to sendmsg() or recvmsg(). The following example
7521 * shows two ancillary data objects in a control buffer.
7523 * |<--------------------------- msg_controllen -------------------------->|
7526 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7528 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7531 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7533 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7536 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7537 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7539 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7541 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7548 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
7550 struct msghdr *my_msg = (struct msghdr *)msg;
7551 struct cmsghdr *cmsg;
7553 for_each_cmsghdr(cmsg, my_msg) {
7554 if (!CMSG_OK(my_msg, cmsg))
7557 /* Should we parse this header or ignore? */
7558 if (cmsg->cmsg_level != IPPROTO_SCTP)
7561 /* Strictly check lengths following example in SCM code. */
7562 switch (cmsg->cmsg_type) {
7564 /* SCTP Socket API Extension
7565 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7567 * This cmsghdr structure provides information for
7568 * initializing new SCTP associations with sendmsg().
7569 * The SCTP_INITMSG socket option uses this same data
7570 * structure. This structure is not used for
7573 * cmsg_level cmsg_type cmsg_data[]
7574 * ------------ ------------ ----------------------
7575 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7577 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
7580 cmsgs->init = CMSG_DATA(cmsg);
7584 /* SCTP Socket API Extension
7585 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7587 * This cmsghdr structure specifies SCTP options for
7588 * sendmsg() and describes SCTP header information
7589 * about a received message through recvmsg().
7591 * cmsg_level cmsg_type cmsg_data[]
7592 * ------------ ------------ ----------------------
7593 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7595 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
7598 cmsgs->srinfo = CMSG_DATA(cmsg);
7600 if (cmsgs->srinfo->sinfo_flags &
7601 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7602 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7603 SCTP_ABORT | SCTP_EOF))
7608 /* SCTP Socket API Extension
7609 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7611 * This cmsghdr structure specifies SCTP options for
7612 * sendmsg(). This structure and SCTP_RCVINFO replaces
7613 * SCTP_SNDRCV which has been deprecated.
7615 * cmsg_level cmsg_type cmsg_data[]
7616 * ------------ ------------ ---------------------
7617 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7619 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7622 cmsgs->sinfo = CMSG_DATA(cmsg);
7624 if (cmsgs->sinfo->snd_flags &
7625 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7626 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7627 SCTP_ABORT | SCTP_EOF))
7639 * Wait for a packet..
7640 * Note: This function is the same function as in core/datagram.c
7641 * with a few modifications to make lksctp work.
7643 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
7648 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7650 /* Socket errors? */
7651 error = sock_error(sk);
7655 if (!skb_queue_empty(&sk->sk_receive_queue))
7658 /* Socket shut down? */
7659 if (sk->sk_shutdown & RCV_SHUTDOWN)
7662 /* Sequenced packets can come disconnected. If so we report the
7667 /* Is there a good reason to think that we may receive some data? */
7668 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
7671 /* Handle signals. */
7672 if (signal_pending(current))
7675 /* Let another process have a go. Since we are going to sleep
7676 * anyway. Note: This may cause odd behaviors if the message
7677 * does not fit in the user's buffer, but this seems to be the
7678 * only way to honor MSG_DONTWAIT realistically.
7681 *timeo_p = schedule_timeout(*timeo_p);
7685 finish_wait(sk_sleep(sk), &wait);
7689 error = sock_intr_errno(*timeo_p);
7692 finish_wait(sk_sleep(sk), &wait);
7697 /* Receive a datagram.
7698 * Note: This is pretty much the same routine as in core/datagram.c
7699 * with a few changes to make lksctp work.
7701 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
7702 int noblock, int *err)
7705 struct sk_buff *skb;
7708 timeo = sock_rcvtimeo(sk, noblock);
7710 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
7711 MAX_SCHEDULE_TIMEOUT);
7714 /* Again only user level code calls this function,
7715 * so nothing interrupt level
7716 * will suddenly eat the receive_queue.
7718 * Look at current nfs client by the way...
7719 * However, this function was correct in any case. 8)
7721 if (flags & MSG_PEEK) {
7722 skb = skb_peek(&sk->sk_receive_queue);
7724 refcount_inc(&skb->users);
7726 skb = __skb_dequeue(&sk->sk_receive_queue);
7732 /* Caller is allowed not to check sk->sk_err before calling. */
7733 error = sock_error(sk);
7737 if (sk->sk_shutdown & RCV_SHUTDOWN)
7740 if (sk_can_busy_loop(sk)) {
7741 sk_busy_loop(sk, noblock);
7743 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
7747 /* User doesn't want to wait. */
7751 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
7760 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7761 static void __sctp_write_space(struct sctp_association *asoc)
7763 struct sock *sk = asoc->base.sk;
7765 if (sctp_wspace(asoc) <= 0)
7768 if (waitqueue_active(&asoc->wait))
7769 wake_up_interruptible(&asoc->wait);
7771 if (sctp_writeable(sk)) {
7772 struct socket_wq *wq;
7775 wq = rcu_dereference(sk->sk_wq);
7777 if (waitqueue_active(&wq->wait))
7778 wake_up_interruptible(&wq->wait);
7780 /* Note that we try to include the Async I/O support
7781 * here by modeling from the current TCP/UDP code.
7782 * We have not tested with it yet.
7784 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7785 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
7791 static void sctp_wake_up_waiters(struct sock *sk,
7792 struct sctp_association *asoc)
7794 struct sctp_association *tmp = asoc;
7796 /* We do accounting for the sndbuf space per association,
7797 * so we only need to wake our own association.
7799 if (asoc->ep->sndbuf_policy)
7800 return __sctp_write_space(asoc);
7802 /* If association goes down and is just flushing its
7803 * outq, then just normally notify others.
7805 if (asoc->base.dead)
7806 return sctp_write_space(sk);
7808 /* Accounting for the sndbuf space is per socket, so we
7809 * need to wake up others, try to be fair and in case of
7810 * other associations, let them have a go first instead
7811 * of just doing a sctp_write_space() call.
7813 * Note that we reach sctp_wake_up_waiters() only when
7814 * associations free up queued chunks, thus we are under
7815 * lock and the list of associations on a socket is
7816 * guaranteed not to change.
7818 for (tmp = list_next_entry(tmp, asocs); 1;
7819 tmp = list_next_entry(tmp, asocs)) {
7820 /* Manually skip the head element. */
7821 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
7823 /* Wake up association. */
7824 __sctp_write_space(tmp);
7825 /* We've reached the end. */
7831 /* Do accounting for the sndbuf space.
7832 * Decrement the used sndbuf space of the corresponding association by the
7833 * data size which was just transmitted(freed).
7835 static void sctp_wfree(struct sk_buff *skb)
7837 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
7838 struct sctp_association *asoc = chunk->asoc;
7839 struct sock *sk = asoc->base.sk;
7841 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
7842 sizeof(struct sk_buff) +
7843 sizeof(struct sctp_chunk);
7845 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
7848 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7850 sk->sk_wmem_queued -= skb->truesize;
7851 sk_mem_uncharge(sk, skb->truesize);
7854 sctp_wake_up_waiters(sk, asoc);
7856 sctp_association_put(asoc);
7859 /* Do accounting for the receive space on the socket.
7860 * Accounting for the association is done in ulpevent.c
7861 * We set this as a destructor for the cloned data skbs so that
7862 * accounting is done at the correct time.
7864 void sctp_sock_rfree(struct sk_buff *skb)
7866 struct sock *sk = skb->sk;
7867 struct sctp_ulpevent *event = sctp_skb2event(skb);
7869 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
7872 * Mimic the behavior of sock_rfree
7874 sk_mem_uncharge(sk, event->rmem_len);
7878 /* Helper function to wait for space in the sndbuf. */
7879 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
7882 struct sock *sk = asoc->base.sk;
7883 long current_timeo = *timeo_p;
7887 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
7890 /* Increment the association's refcnt. */
7891 sctp_association_hold(asoc);
7893 /* Wait on the association specific sndbuf space. */
7895 prepare_to_wait_exclusive(&asoc->wait, &wait,
7896 TASK_INTERRUPTIBLE);
7897 if (asoc->base.dead)
7901 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
7903 if (signal_pending(current))
7904 goto do_interrupted;
7905 if (msg_len <= sctp_wspace(asoc))
7908 /* Let another process have a go. Since we are going
7912 current_timeo = schedule_timeout(current_timeo);
7914 if (sk != asoc->base.sk)
7917 *timeo_p = current_timeo;
7921 finish_wait(&asoc->wait, &wait);
7923 /* Release the association's refcnt. */
7924 sctp_association_put(asoc);
7937 err = sock_intr_errno(*timeo_p);
7945 void sctp_data_ready(struct sock *sk)
7947 struct socket_wq *wq;
7950 wq = rcu_dereference(sk->sk_wq);
7951 if (skwq_has_sleeper(wq))
7952 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7953 POLLRDNORM | POLLRDBAND);
7954 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7958 /* If socket sndbuf has changed, wake up all per association waiters. */
7959 void sctp_write_space(struct sock *sk)
7961 struct sctp_association *asoc;
7963 /* Wake up the tasks in each wait queue. */
7964 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7965 __sctp_write_space(asoc);
7969 /* Is there any sndbuf space available on the socket?
7971 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7972 * associations on the same socket. For a UDP-style socket with
7973 * multiple associations, it is possible for it to be "unwriteable"
7974 * prematurely. I assume that this is acceptable because
7975 * a premature "unwriteable" is better than an accidental "writeable" which
7976 * would cause an unwanted block under certain circumstances. For the 1-1
7977 * UDP-style sockets or TCP-style sockets, this code should work.
7980 static int sctp_writeable(struct sock *sk)
7984 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7990 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7991 * returns immediately with EINPROGRESS.
7993 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7995 struct sock *sk = asoc->base.sk;
7997 long current_timeo = *timeo_p;
8000 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
8002 /* Increment the association's refcnt. */
8003 sctp_association_hold(asoc);
8006 prepare_to_wait_exclusive(&asoc->wait, &wait,
8007 TASK_INTERRUPTIBLE);
8010 if (sk->sk_shutdown & RCV_SHUTDOWN)
8012 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
8015 if (signal_pending(current))
8016 goto do_interrupted;
8018 if (sctp_state(asoc, ESTABLISHED))
8021 /* Let another process have a go. Since we are going
8025 current_timeo = schedule_timeout(current_timeo);
8028 *timeo_p = current_timeo;
8032 finish_wait(&asoc->wait, &wait);
8034 /* Release the association's refcnt. */
8035 sctp_association_put(asoc);
8040 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
8043 err = -ECONNREFUSED;
8047 err = sock_intr_errno(*timeo_p);
8055 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8057 struct sctp_endpoint *ep;
8061 ep = sctp_sk(sk)->ep;
8065 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8066 TASK_INTERRUPTIBLE);
8068 if (list_empty(&ep->asocs)) {
8070 timeo = schedule_timeout(timeo);
8075 if (!sctp_sstate(sk, LISTENING))
8079 if (!list_empty(&ep->asocs))
8082 err = sock_intr_errno(timeo);
8083 if (signal_pending(current))
8091 finish_wait(sk_sleep(sk), &wait);
8096 static void sctp_wait_for_close(struct sock *sk, long timeout)
8101 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8102 if (list_empty(&sctp_sk(sk)->ep->asocs))
8105 timeout = schedule_timeout(timeout);
8107 } while (!signal_pending(current) && timeout);
8109 finish_wait(sk_sleep(sk), &wait);
8112 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8114 struct sk_buff *frag;
8119 /* Don't forget the fragments. */
8120 skb_walk_frags(skb, frag)
8121 sctp_skb_set_owner_r_frag(frag, sk);
8124 sctp_skb_set_owner_r(skb, sk);
8127 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8128 struct sctp_association *asoc)
8130 struct inet_sock *inet = inet_sk(sk);
8131 struct inet_sock *newinet;
8133 newsk->sk_type = sk->sk_type;
8134 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8135 newsk->sk_flags = sk->sk_flags;
8136 newsk->sk_tsflags = sk->sk_tsflags;
8137 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8138 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8139 newsk->sk_reuse = sk->sk_reuse;
8141 newsk->sk_shutdown = sk->sk_shutdown;
8142 newsk->sk_destruct = sk->sk_destruct;
8143 newsk->sk_family = sk->sk_family;
8144 newsk->sk_protocol = IPPROTO_SCTP;
8145 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8146 newsk->sk_sndbuf = sk->sk_sndbuf;
8147 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8148 newsk->sk_lingertime = sk->sk_lingertime;
8149 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8150 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8151 newsk->sk_rxhash = sk->sk_rxhash;
8153 newinet = inet_sk(newsk);
8155 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8156 * getsockname() and getpeername()
8158 newinet->inet_sport = inet->inet_sport;
8159 newinet->inet_saddr = inet->inet_saddr;
8160 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8161 newinet->inet_dport = htons(asoc->peer.port);
8162 newinet->pmtudisc = inet->pmtudisc;
8163 newinet->inet_id = prandom_u32();
8165 newinet->uc_ttl = inet->uc_ttl;
8166 newinet->mc_loop = 1;
8167 newinet->mc_ttl = 1;
8168 newinet->mc_index = 0;
8169 newinet->mc_list = NULL;
8171 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8172 net_enable_timestamp();
8174 security_sk_clone(sk, newsk);
8177 static inline void sctp_copy_descendant(struct sock *sk_to,
8178 const struct sock *sk_from)
8180 int ancestor_size = sizeof(struct inet_sock) +
8181 sizeof(struct sctp_sock) -
8182 offsetof(struct sctp_sock, auto_asconf_list);
8184 if (sk_from->sk_family == PF_INET6)
8185 ancestor_size += sizeof(struct ipv6_pinfo);
8187 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8190 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8191 * and its messages to the newsk.
8193 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8194 struct sctp_association *assoc,
8195 enum sctp_socket_type type)
8197 struct sctp_sock *oldsp = sctp_sk(oldsk);
8198 struct sctp_sock *newsp = sctp_sk(newsk);
8199 struct sctp_bind_bucket *pp; /* hash list port iterator */
8200 struct sctp_endpoint *newep = newsp->ep;
8201 struct sk_buff *skb, *tmp;
8202 struct sctp_ulpevent *event;
8203 struct sctp_bind_hashbucket *head;
8205 /* Migrate socket buffer sizes and all the socket level options to the
8208 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8209 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8210 /* Brute force copy old sctp opt. */
8211 sctp_copy_descendant(newsk, oldsk);
8213 /* Restore the ep value that was overwritten with the above structure
8219 /* Hook this new socket in to the bind_hash list. */
8220 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8221 inet_sk(oldsk)->inet_num)];
8222 spin_lock_bh(&head->lock);
8223 pp = sctp_sk(oldsk)->bind_hash;
8224 sk_add_bind_node(newsk, &pp->owner);
8225 sctp_sk(newsk)->bind_hash = pp;
8226 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8227 spin_unlock_bh(&head->lock);
8229 /* Copy the bind_addr list from the original endpoint to the new
8230 * endpoint so that we can handle restarts properly
8232 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8233 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8235 sctp_auto_asconf_init(newsp);
8237 /* Move any messages in the old socket's receive queue that are for the
8238 * peeled off association to the new socket's receive queue.
8240 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8241 event = sctp_skb2event(skb);
8242 if (event->asoc == assoc) {
8243 __skb_unlink(skb, &oldsk->sk_receive_queue);
8244 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8245 sctp_skb_set_owner_r_frag(skb, newsk);
8249 /* Clean up any messages pending delivery due to partial
8250 * delivery. Three cases:
8251 * 1) No partial deliver; no work.
8252 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8253 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8255 skb_queue_head_init(&newsp->pd_lobby);
8256 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8258 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8259 struct sk_buff_head *queue;
8261 /* Decide which queue to move pd_lobby skbs to. */
8262 if (assoc->ulpq.pd_mode) {
8263 queue = &newsp->pd_lobby;
8265 queue = &newsk->sk_receive_queue;
8267 /* Walk through the pd_lobby, looking for skbs that
8268 * need moved to the new socket.
8270 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8271 event = sctp_skb2event(skb);
8272 if (event->asoc == assoc) {
8273 __skb_unlink(skb, &oldsp->pd_lobby);
8274 __skb_queue_tail(queue, skb);
8275 sctp_skb_set_owner_r_frag(skb, newsk);
8279 /* Clear up any skbs waiting for the partial
8280 * delivery to finish.
8282 if (assoc->ulpq.pd_mode)
8283 sctp_clear_pd(oldsk, NULL);
8287 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
8288 sctp_skb_set_owner_r_frag(skb, newsk);
8290 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
8291 sctp_skb_set_owner_r_frag(skb, newsk);
8293 /* Set the type of socket to indicate that it is peeled off from the
8294 * original UDP-style socket or created with the accept() call on a
8295 * TCP-style socket..
8299 /* Mark the new socket "in-use" by the user so that any packets
8300 * that may arrive on the association after we've moved it are
8301 * queued to the backlog. This prevents a potential race between
8302 * backlog processing on the old socket and new-packet processing
8303 * on the new socket.
8305 * The caller has just allocated newsk so we can guarantee that other
8306 * paths won't try to lock it and then oldsk.
8308 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8309 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
8310 sctp_assoc_migrate(assoc, newsk);
8311 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
8313 /* If the association on the newsk is already closed before accept()
8314 * is called, set RCV_SHUTDOWN flag.
8316 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8317 newsk->sk_state = SCTP_SS_CLOSED;
8318 newsk->sk_shutdown |= RCV_SHUTDOWN;
8320 newsk->sk_state = SCTP_SS_ESTABLISHED;
8323 release_sock(newsk);
8327 /* This proto struct describes the ULP interface for SCTP. */
8328 struct proto sctp_prot = {
8330 .owner = THIS_MODULE,
8331 .close = sctp_close,
8332 .disconnect = sctp_disconnect,
8333 .accept = sctp_accept,
8334 .ioctl = sctp_ioctl,
8335 .init = sctp_init_sock,
8336 .destroy = sctp_destroy_sock,
8337 .shutdown = sctp_shutdown,
8338 .setsockopt = sctp_setsockopt,
8339 .getsockopt = sctp_getsockopt,
8340 .sendmsg = sctp_sendmsg,
8341 .recvmsg = sctp_recvmsg,
8343 .backlog_rcv = sctp_backlog_rcv,
8345 .unhash = sctp_unhash,
8346 .no_autobind = true,
8347 .obj_size = sizeof(struct sctp_sock),
8348 .sysctl_mem = sysctl_sctp_mem,
8349 .sysctl_rmem = sysctl_sctp_rmem,
8350 .sysctl_wmem = sysctl_sctp_wmem,
8351 .memory_pressure = &sctp_memory_pressure,
8352 .enter_memory_pressure = sctp_enter_memory_pressure,
8353 .memory_allocated = &sctp_memory_allocated,
8354 .sockets_allocated = &sctp_sockets_allocated,
8357 #if IS_ENABLED(CONFIG_IPV6)
8359 static void sctp_v6_destruct_sock(struct sock *sk)
8361 sctp_destruct_common(sk);
8362 inet6_sock_destruct(sk);
8365 static int sctp_v6_init_sock(struct sock *sk)
8367 int ret = sctp_init_sock(sk);
8370 sk->sk_destruct = sctp_v6_destruct_sock;
8375 struct proto sctpv6_prot = {
8377 .owner = THIS_MODULE,
8378 .close = sctp_close,
8379 .disconnect = sctp_disconnect,
8380 .accept = sctp_accept,
8381 .ioctl = sctp_ioctl,
8382 .init = sctp_v6_init_sock,
8383 .destroy = sctp_destroy_sock,
8384 .shutdown = sctp_shutdown,
8385 .setsockopt = sctp_setsockopt,
8386 .getsockopt = sctp_getsockopt,
8387 .sendmsg = sctp_sendmsg,
8388 .recvmsg = sctp_recvmsg,
8390 .backlog_rcv = sctp_backlog_rcv,
8392 .unhash = sctp_unhash,
8393 .no_autobind = true,
8394 .obj_size = sizeof(struct sctp6_sock),
8395 .sysctl_mem = sysctl_sctp_mem,
8396 .sysctl_rmem = sysctl_sctp_rmem,
8397 .sysctl_wmem = sysctl_sctp_wmem,
8398 .memory_pressure = &sctp_memory_pressure,
8399 .enter_memory_pressure = sctp_enter_memory_pressure,
8400 .memory_allocated = &sctp_memory_allocated,
8401 .sockets_allocated = &sctp_sockets_allocated,
8403 #endif /* IS_ENABLED(CONFIG_IPV6) */