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 *, 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 sctp_memory_pressure = 1;
117 /* Get the sndbuf space available at the time on the association. */
118 static inline int sctp_wspace(struct sctp_association *asoc)
122 if (asoc->ep->sndbuf_policy)
123 amt = asoc->sndbuf_used;
125 amt = sk_wmem_alloc_get(asoc->base.sk);
127 if (amt >= asoc->base.sk->sk_sndbuf) {
128 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
131 amt = sk_stream_wspace(asoc->base.sk);
136 amt = asoc->base.sk->sk_sndbuf - amt;
141 /* Increment the used sndbuf space count of the corresponding association by
142 * the size of the outgoing data chunk.
143 * Also, set the skb destructor for sndbuf accounting later.
145 * Since it is always 1-1 between chunk and skb, and also a new skb is always
146 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
147 * destructor in the data chunk skb for the purpose of the sndbuf space
150 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
152 struct sctp_association *asoc = chunk->asoc;
153 struct sock *sk = asoc->base.sk;
155 /* The sndbuf space is tracked per association. */
156 sctp_association_hold(asoc);
158 skb_set_owner_w(chunk->skb, sk);
160 chunk->skb->destructor = sctp_wfree;
161 /* Save the chunk pointer in skb for sctp_wfree to use later. */
162 skb_shinfo(chunk->skb)->destructor_arg = chunk;
164 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
165 sizeof(struct sk_buff) +
166 sizeof(struct sctp_chunk);
168 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
169 sk->sk_wmem_queued += chunk->skb->truesize;
170 sk_mem_charge(sk, chunk->skb->truesize);
173 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
175 skb_orphan(chunk->skb);
178 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
179 void (*cb)(struct sctp_chunk *))
182 struct sctp_outq *q = &asoc->outqueue;
183 struct sctp_transport *t;
184 struct sctp_chunk *chunk;
186 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
187 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
190 list_for_each_entry(chunk, &q->retransmit, list)
193 list_for_each_entry(chunk, &q->sacked, list)
196 list_for_each_entry(chunk, &q->abandoned, list)
199 list_for_each_entry(chunk, &q->out_chunk_list, list)
203 /* Verify that this is a valid address. */
204 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
209 /* Verify basic sockaddr. */
210 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
214 /* Is this a valid SCTP address? */
215 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
218 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
224 /* Look up the association by its id. If this is not a UDP-style
225 * socket, the ID field is always ignored.
227 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
229 struct sctp_association *asoc = NULL;
231 /* If this is not a UDP-style socket, assoc id should be ignored. */
232 if (!sctp_style(sk, UDP)) {
233 /* Return NULL if the socket state is not ESTABLISHED. It
234 * could be a TCP-style listening socket or a socket which
235 * hasn't yet called connect() to establish an association.
237 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
240 /* Get the first and the only association from the list. */
241 if (!list_empty(&sctp_sk(sk)->ep->asocs))
242 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
243 struct sctp_association, asocs);
247 /* Otherwise this is a UDP-style socket. */
248 if (!id || (id == (sctp_assoc_t)-1))
251 spin_lock_bh(&sctp_assocs_id_lock);
252 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
253 spin_unlock_bh(&sctp_assocs_id_lock);
255 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
261 /* Look up the transport from an address and an assoc id. If both address and
262 * id are specified, the associations matching the address and the id should be
265 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
266 struct sockaddr_storage *addr,
269 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
270 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
271 union sctp_addr *laddr = (union sctp_addr *)addr;
272 struct sctp_transport *transport;
274 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
277 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
284 id_asoc = sctp_id2assoc(sk, id);
285 if (id_asoc && (id_asoc != addr_asoc))
288 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
289 (union sctp_addr *)addr);
294 /* API 3.1.2 bind() - UDP Style Syntax
295 * The syntax of bind() is,
297 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
299 * sd - the socket descriptor returned by socket().
300 * addr - the address structure (struct sockaddr_in or struct
301 * sockaddr_in6 [RFC 2553]),
302 * addr_len - the size of the address structure.
304 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
313 /* Disallow binding twice. */
314 if (!sctp_sk(sk)->ep->base.bind_addr.port)
315 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
325 static long sctp_get_port_local(struct sock *, union sctp_addr *);
327 /* Verify this is a valid sockaddr. */
328 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
329 union sctp_addr *addr, int len)
333 /* Check minimum size. */
334 if (len < sizeof (struct sockaddr))
337 /* V4 mapped address are really of AF_INET family */
338 if (addr->sa.sa_family == AF_INET6 &&
339 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
340 if (!opt->pf->af_supported(AF_INET, opt))
343 /* Does this PF support this AF? */
344 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
348 /* If we get this far, af is valid. */
349 af = sctp_get_af_specific(addr->sa.sa_family);
351 if (len < af->sockaddr_len)
357 /* Bind a local address either to an endpoint or to an association. */
358 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
360 struct net *net = sock_net(sk);
361 struct sctp_sock *sp = sctp_sk(sk);
362 struct sctp_endpoint *ep = sp->ep;
363 struct sctp_bind_addr *bp = &ep->base.bind_addr;
368 /* Common sockaddr verification. */
369 af = sctp_sockaddr_af(sp, addr, len);
371 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
372 __func__, sk, addr, len);
376 snum = ntohs(addr->v4.sin_port);
378 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
379 __func__, sk, &addr->sa, bp->port, snum, len);
381 /* PF specific bind() address verification. */
382 if (!sp->pf->bind_verify(sp, addr))
383 return -EADDRNOTAVAIL;
385 /* We must either be unbound, or bind to the same port.
386 * It's OK to allow 0 ports if we are already bound.
387 * We'll just inhert an already bound port in this case
392 else if (snum != bp->port) {
393 pr_debug("%s: new port %d doesn't match existing port "
394 "%d\n", __func__, snum, bp->port);
399 if (snum && snum < inet_prot_sock(net) &&
400 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
403 /* See if the address matches any of the addresses we may have
404 * already bound before checking against other endpoints.
406 if (sctp_bind_addr_match(bp, addr, sp))
409 /* Make sure we are allowed to bind here.
410 * The function sctp_get_port_local() does duplicate address
413 addr->v4.sin_port = htons(snum);
414 if ((ret = sctp_get_port_local(sk, addr))) {
418 /* Refresh ephemeral port. */
420 bp->port = inet_sk(sk)->inet_num;
422 /* Add the address to the bind address list.
423 * Use GFP_ATOMIC since BHs will be disabled.
425 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
426 SCTP_ADDR_SRC, GFP_ATOMIC);
428 /* Copy back into socket for getsockname() use. */
430 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
431 sp->pf->to_sk_saddr(addr, sk);
437 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
439 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
440 * at any one time. If a sender, after sending an ASCONF chunk, decides
441 * it needs to transfer another ASCONF Chunk, it MUST wait until the
442 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
443 * subsequent ASCONF. Note this restriction binds each side, so at any
444 * time two ASCONF may be in-transit on any given association (one sent
445 * from each endpoint).
447 static int sctp_send_asconf(struct sctp_association *asoc,
448 struct sctp_chunk *chunk)
450 struct net *net = sock_net(asoc->base.sk);
453 /* If there is an outstanding ASCONF chunk, queue it for later
456 if (asoc->addip_last_asconf) {
457 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
461 /* Hold the chunk until an ASCONF_ACK is received. */
462 sctp_chunk_hold(chunk);
463 retval = sctp_primitive_ASCONF(net, asoc, chunk);
465 sctp_chunk_free(chunk);
467 asoc->addip_last_asconf = chunk;
473 /* Add a list of addresses as bind addresses to local endpoint or
476 * Basically run through each address specified in the addrs/addrcnt
477 * array/length pair, determine if it is IPv6 or IPv4 and call
478 * sctp_do_bind() on it.
480 * If any of them fails, then the operation will be reversed and the
481 * ones that were added will be removed.
483 * Only sctp_setsockopt_bindx() is supposed to call this function.
485 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
490 struct sockaddr *sa_addr;
493 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
497 for (cnt = 0; cnt < addrcnt; cnt++) {
498 /* The list may contain either IPv4 or IPv6 address;
499 * determine the address length for walking thru the list.
502 af = sctp_get_af_specific(sa_addr->sa_family);
508 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
511 addr_buf += af->sockaddr_len;
515 /* Failed. Cleanup the ones that have been added */
517 sctp_bindx_rem(sk, addrs, cnt);
525 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
526 * associations that are part of the endpoint indicating that a list of local
527 * addresses are added to the endpoint.
529 * If any of the addresses is already in the bind address list of the
530 * association, we do not send the chunk for that association. But it will not
531 * affect other associations.
533 * Only sctp_setsockopt_bindx() is supposed to call this function.
535 static int sctp_send_asconf_add_ip(struct sock *sk,
536 struct sockaddr *addrs,
539 struct net *net = sock_net(sk);
540 struct sctp_sock *sp;
541 struct sctp_endpoint *ep;
542 struct sctp_association *asoc;
543 struct sctp_bind_addr *bp;
544 struct sctp_chunk *chunk;
545 struct sctp_sockaddr_entry *laddr;
546 union sctp_addr *addr;
547 union sctp_addr saveaddr;
554 if (!net->sctp.addip_enable)
560 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
561 __func__, sk, addrs, addrcnt);
563 list_for_each_entry(asoc, &ep->asocs, asocs) {
564 if (!asoc->peer.asconf_capable)
567 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
570 if (!sctp_state(asoc, ESTABLISHED))
573 /* Check if any address in the packed array of addresses is
574 * in the bind address list of the association. If so,
575 * do not send the asconf chunk to its peer, but continue with
576 * other associations.
579 for (i = 0; i < addrcnt; i++) {
581 af = sctp_get_af_specific(addr->v4.sin_family);
587 if (sctp_assoc_lookup_laddr(asoc, addr))
590 addr_buf += af->sockaddr_len;
595 /* Use the first valid address in bind addr list of
596 * association as Address Parameter of ASCONF CHUNK.
598 bp = &asoc->base.bind_addr;
599 p = bp->address_list.next;
600 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
601 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
602 addrcnt, SCTP_PARAM_ADD_IP);
608 /* Add the new addresses to the bind address list with
609 * use_as_src set to 0.
612 for (i = 0; i < addrcnt; i++) {
614 af = sctp_get_af_specific(addr->v4.sin_family);
615 memcpy(&saveaddr, addr, af->sockaddr_len);
616 retval = sctp_add_bind_addr(bp, &saveaddr,
618 SCTP_ADDR_NEW, GFP_ATOMIC);
619 addr_buf += af->sockaddr_len;
621 if (asoc->src_out_of_asoc_ok) {
622 struct sctp_transport *trans;
624 list_for_each_entry(trans,
625 &asoc->peer.transport_addr_list, transports) {
626 /* Clear the source and route cache */
627 sctp_transport_dst_release(trans);
628 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
629 2*asoc->pathmtu, 4380));
630 trans->ssthresh = asoc->peer.i.a_rwnd;
631 trans->rto = asoc->rto_initial;
632 sctp_max_rto(asoc, trans);
633 trans->rtt = trans->srtt = trans->rttvar = 0;
634 sctp_transport_route(trans, NULL,
635 sctp_sk(asoc->base.sk));
638 retval = sctp_send_asconf(asoc, chunk);
645 /* Remove a list of addresses from bind addresses list. Do not remove the
648 * Basically run through each address specified in the addrs/addrcnt
649 * array/length pair, determine if it is IPv6 or IPv4 and call
650 * sctp_del_bind() on it.
652 * If any of them fails, then the operation will be reversed and the
653 * ones that were removed will be added back.
655 * At least one address has to be left; if only one address is
656 * available, the operation will return -EBUSY.
658 * Only sctp_setsockopt_bindx() is supposed to call this function.
660 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
662 struct sctp_sock *sp = sctp_sk(sk);
663 struct sctp_endpoint *ep = sp->ep;
665 struct sctp_bind_addr *bp = &ep->base.bind_addr;
668 union sctp_addr *sa_addr;
671 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
672 __func__, sk, addrs, addrcnt);
675 for (cnt = 0; cnt < addrcnt; cnt++) {
676 /* If the bind address list is empty or if there is only one
677 * bind address, there is nothing more to be removed (we need
678 * at least one address here).
680 if (list_empty(&bp->address_list) ||
681 (sctp_list_single_entry(&bp->address_list))) {
687 af = sctp_get_af_specific(sa_addr->sa.sa_family);
693 if (!af->addr_valid(sa_addr, sp, NULL)) {
694 retval = -EADDRNOTAVAIL;
698 if (sa_addr->v4.sin_port &&
699 sa_addr->v4.sin_port != htons(bp->port)) {
704 if (!sa_addr->v4.sin_port)
705 sa_addr->v4.sin_port = htons(bp->port);
707 /* FIXME - There is probably a need to check if sk->sk_saddr and
708 * sk->sk_rcv_addr are currently set to one of the addresses to
709 * be removed. This is something which needs to be looked into
710 * when we are fixing the outstanding issues with multi-homing
711 * socket routing and failover schemes. Refer to comments in
712 * sctp_do_bind(). -daisy
714 retval = sctp_del_bind_addr(bp, sa_addr);
716 addr_buf += af->sockaddr_len;
719 /* Failed. Add the ones that has been removed back */
721 sctp_bindx_add(sk, addrs, cnt);
729 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
730 * the associations that are part of the endpoint indicating that a list of
731 * local addresses are removed from the endpoint.
733 * If any of the addresses is already in the bind address list of the
734 * association, we do not send the chunk for that association. But it will not
735 * affect other associations.
737 * Only sctp_setsockopt_bindx() is supposed to call this function.
739 static int sctp_send_asconf_del_ip(struct sock *sk,
740 struct sockaddr *addrs,
743 struct net *net = sock_net(sk);
744 struct sctp_sock *sp;
745 struct sctp_endpoint *ep;
746 struct sctp_association *asoc;
747 struct sctp_transport *transport;
748 struct sctp_bind_addr *bp;
749 struct sctp_chunk *chunk;
750 union sctp_addr *laddr;
753 struct sctp_sockaddr_entry *saddr;
759 if (!net->sctp.addip_enable)
765 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
766 __func__, sk, addrs, addrcnt);
768 list_for_each_entry(asoc, &ep->asocs, asocs) {
770 if (!asoc->peer.asconf_capable)
773 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776 if (!sctp_state(asoc, ESTABLISHED))
779 /* Check if any address in the packed array of addresses is
780 * not present in the bind address list of the association.
781 * If so, do not send the asconf chunk to its peer, but
782 * continue with other associations.
785 for (i = 0; i < addrcnt; i++) {
787 af = sctp_get_af_specific(laddr->v4.sin_family);
793 if (!sctp_assoc_lookup_laddr(asoc, laddr))
796 addr_buf += af->sockaddr_len;
801 /* Find one address in the association's bind address list
802 * that is not in the packed array of addresses. This is to
803 * make sure that we do not delete all the addresses in the
806 bp = &asoc->base.bind_addr;
807 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
809 if ((laddr == NULL) && (addrcnt == 1)) {
810 if (asoc->asconf_addr_del_pending)
812 asoc->asconf_addr_del_pending =
813 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
814 if (asoc->asconf_addr_del_pending == NULL) {
818 asoc->asconf_addr_del_pending->sa.sa_family =
820 asoc->asconf_addr_del_pending->v4.sin_port =
822 if (addrs->sa_family == AF_INET) {
823 struct sockaddr_in *sin;
825 sin = (struct sockaddr_in *)addrs;
826 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
827 } else if (addrs->sa_family == AF_INET6) {
828 struct sockaddr_in6 *sin6;
830 sin6 = (struct sockaddr_in6 *)addrs;
831 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
835 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
836 asoc->asconf_addr_del_pending);
838 asoc->src_out_of_asoc_ok = 1;
846 /* We do not need RCU protection throughout this loop
847 * because this is done under a socket lock from the
850 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
858 /* Reset use_as_src flag for the addresses in the bind address
859 * list that are to be deleted.
862 for (i = 0; i < addrcnt; i++) {
864 af = sctp_get_af_specific(laddr->v4.sin_family);
865 list_for_each_entry(saddr, &bp->address_list, list) {
866 if (sctp_cmp_addr_exact(&saddr->a, laddr))
867 saddr->state = SCTP_ADDR_DEL;
869 addr_buf += af->sockaddr_len;
872 /* Update the route and saddr entries for all the transports
873 * as some of the addresses in the bind address list are
874 * about to be deleted and cannot be used as source addresses.
876 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
878 sctp_transport_dst_release(transport);
879 sctp_transport_route(transport, NULL,
880 sctp_sk(asoc->base.sk));
884 /* We don't need to transmit ASCONF */
886 retval = sctp_send_asconf(asoc, chunk);
892 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
893 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
895 struct sock *sk = sctp_opt2sk(sp);
896 union sctp_addr *addr;
899 /* It is safe to write port space in caller. */
901 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
902 af = sctp_get_af_specific(addr->sa.sa_family);
905 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
908 if (addrw->state == SCTP_ADDR_NEW)
909 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
911 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
914 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
917 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
920 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
921 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
924 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
925 * Section 3.1.2 for this usage.
927 * addrs is a pointer to an array of one or more socket addresses. Each
928 * address is contained in its appropriate structure (i.e. struct
929 * sockaddr_in or struct sockaddr_in6) the family of the address type
930 * must be used to distinguish the address length (note that this
931 * representation is termed a "packed array" of addresses). The caller
932 * specifies the number of addresses in the array with addrcnt.
934 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
935 * -1, and sets errno to the appropriate error code.
937 * For SCTP, the port given in each socket address must be the same, or
938 * sctp_bindx() will fail, setting errno to EINVAL.
940 * The flags parameter is formed from the bitwise OR of zero or more of
941 * the following currently defined flags:
943 * SCTP_BINDX_ADD_ADDR
945 * SCTP_BINDX_REM_ADDR
947 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
948 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
949 * addresses from the association. The two flags are mutually exclusive;
950 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
951 * not remove all addresses from an association; sctp_bindx() will
952 * reject such an attempt with EINVAL.
954 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
955 * additional addresses with an endpoint after calling bind(). Or use
956 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
957 * socket is associated with so that no new association accepted will be
958 * associated with those addresses. If the endpoint supports dynamic
959 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
960 * endpoint to send the appropriate message to the peer to change the
961 * peers address lists.
963 * Adding and removing addresses from a connected association is
964 * optional functionality. Implementations that do not support this
965 * functionality should return EOPNOTSUPP.
967 * Basically do nothing but copying the addresses from user to kernel
968 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
969 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
972 * We don't use copy_from_user() for optimization: we first do the
973 * sanity checks (buffer size -fast- and access check-healthy
974 * pointer); if all of those succeed, then we can alloc the memory
975 * (expensive operation) needed to copy the data to kernel. Then we do
976 * the copying without checking the user space area
977 * (__copy_from_user()).
979 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
982 * sk The sk of the socket
983 * addrs The pointer to the addresses in user land
984 * addrssize Size of the addrs buffer
985 * op Operation to perform (add or remove, see the flags of
988 * Returns 0 if ok, <0 errno code on error.
990 static int sctp_setsockopt_bindx(struct sock *sk,
991 struct sockaddr __user *addrs,
992 int addrs_size, int op)
994 struct sockaddr *kaddrs;
998 struct sockaddr *sa_addr;
1002 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1003 __func__, sk, addrs, addrs_size, op);
1005 if (unlikely(addrs_size <= 0))
1008 /* Check the user passed a healthy pointer. */
1009 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1012 /* Alloc space for the address array in kernel memory. */
1013 kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN);
1014 if (unlikely(!kaddrs))
1017 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1022 /* Walk through the addrs buffer and count the number of addresses. */
1024 while (walk_size < addrs_size) {
1025 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1031 af = sctp_get_af_specific(sa_addr->sa_family);
1033 /* If the address family is not supported or if this address
1034 * causes the address buffer to overflow return EINVAL.
1036 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1041 addr_buf += af->sockaddr_len;
1042 walk_size += af->sockaddr_len;
1047 case SCTP_BINDX_ADD_ADDR:
1048 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1051 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1054 case SCTP_BINDX_REM_ADDR:
1055 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1058 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1072 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1074 * Common routine for handling connect() and sctp_connectx().
1075 * Connect will come in with just a single address.
1077 static int __sctp_connect(struct sock *sk,
1078 struct sockaddr *kaddrs,
1080 sctp_assoc_t *assoc_id)
1082 struct net *net = sock_net(sk);
1083 struct sctp_sock *sp;
1084 struct sctp_endpoint *ep;
1085 struct sctp_association *asoc = NULL;
1086 struct sctp_association *asoc2;
1087 struct sctp_transport *transport;
1089 enum sctp_scope scope;
1094 union sctp_addr *sa_addr = NULL;
1096 unsigned short port;
1097 unsigned int f_flags = 0;
1102 /* connect() cannot be done on a socket that is already in ESTABLISHED
1103 * state - UDP-style peeled off socket or a TCP-style socket that
1104 * is already connected.
1105 * It cannot be done even on a TCP-style listening socket.
1107 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1108 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1113 /* Walk through the addrs buffer and count the number of addresses. */
1115 while (walk_size < addrs_size) {
1118 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1124 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1126 /* If the address family is not supported or if this address
1127 * causes the address buffer to overflow return EINVAL.
1129 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1134 port = ntohs(sa_addr->v4.sin_port);
1136 /* Save current address so we can work with it */
1137 memcpy(&to, sa_addr, af->sockaddr_len);
1139 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1143 /* Make sure the destination port is correctly set
1146 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1151 /* Check if there already is a matching association on the
1152 * endpoint (other than the one created here).
1154 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1155 if (asoc2 && asoc2 != asoc) {
1156 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1163 /* If we could not find a matching association on the endpoint,
1164 * make sure that there is no peeled-off association matching
1165 * the peer address even on another socket.
1167 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1168 err = -EADDRNOTAVAIL;
1173 /* If a bind() or sctp_bindx() is not called prior to
1174 * an sctp_connectx() call, the system picks an
1175 * ephemeral port and will choose an address set
1176 * equivalent to binding with a wildcard address.
1178 if (!ep->base.bind_addr.port) {
1179 if (sctp_autobind(sk)) {
1185 * If an unprivileged user inherits a 1-many
1186 * style socket with open associations on a
1187 * privileged port, it MAY be permitted to
1188 * accept new associations, but it SHOULD NOT
1189 * be permitted to open new associations.
1191 if (ep->base.bind_addr.port <
1192 inet_prot_sock(net) &&
1193 !ns_capable(net->user_ns,
1194 CAP_NET_BIND_SERVICE)) {
1200 scope = sctp_scope(&to);
1201 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1207 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1215 /* Prime the peer's transport structures. */
1216 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1224 addr_buf += af->sockaddr_len;
1225 walk_size += af->sockaddr_len;
1228 /* In case the user of sctp_connectx() wants an association
1229 * id back, assign one now.
1232 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1237 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1242 /* Initialize sk's dport and daddr for getpeername() */
1243 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1244 sp->pf->to_sk_daddr(sa_addr, sk);
1247 /* in-kernel sockets don't generally have a file allocated to them
1248 * if all they do is call sock_create_kern().
1250 if (sk->sk_socket->file)
1251 f_flags = sk->sk_socket->file->f_flags;
1253 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1256 *assoc_id = asoc->assoc_id;
1257 err = sctp_wait_for_connect(asoc, &timeo);
1258 /* Note: the asoc may be freed after the return of
1259 * sctp_wait_for_connect.
1262 /* Don't free association on exit. */
1266 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1267 __func__, asoc, kaddrs, err);
1270 /* sctp_primitive_ASSOCIATE may have added this association
1271 * To the hash table, try to unhash it, just in case, its a noop
1272 * if it wasn't hashed so we're safe
1274 sctp_association_free(asoc);
1279 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1282 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1283 * sctp_assoc_t *asoc);
1285 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1286 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1287 * or IPv6 addresses.
1289 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1290 * Section 3.1.2 for this usage.
1292 * addrs is a pointer to an array of one or more socket addresses. Each
1293 * address is contained in its appropriate structure (i.e. struct
1294 * sockaddr_in or struct sockaddr_in6) the family of the address type
1295 * must be used to distengish the address length (note that this
1296 * representation is termed a "packed array" of addresses). The caller
1297 * specifies the number of addresses in the array with addrcnt.
1299 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1300 * the association id of the new association. On failure, sctp_connectx()
1301 * returns -1, and sets errno to the appropriate error code. The assoc_id
1302 * is not touched by the kernel.
1304 * For SCTP, the port given in each socket address must be the same, or
1305 * sctp_connectx() will fail, setting errno to EINVAL.
1307 * An application can use sctp_connectx to initiate an association with
1308 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1309 * allows a caller to specify multiple addresses at which a peer can be
1310 * reached. The way the SCTP stack uses the list of addresses to set up
1311 * the association is implementation dependent. This function only
1312 * specifies that the stack will try to make use of all the addresses in
1313 * the list when needed.
1315 * Note that the list of addresses passed in is only used for setting up
1316 * the association. It does not necessarily equal the set of addresses
1317 * the peer uses for the resulting association. If the caller wants to
1318 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1319 * retrieve them after the association has been set up.
1321 * Basically do nothing but copying the addresses from user to kernel
1322 * land and invoking either sctp_connectx(). This is used for tunneling
1323 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1325 * We don't use copy_from_user() for optimization: we first do the
1326 * sanity checks (buffer size -fast- and access check-healthy
1327 * pointer); if all of those succeed, then we can alloc the memory
1328 * (expensive operation) needed to copy the data to kernel. Then we do
1329 * the copying without checking the user space area
1330 * (__copy_from_user()).
1332 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1335 * sk The sk of the socket
1336 * addrs The pointer to the addresses in user land
1337 * addrssize Size of the addrs buffer
1339 * Returns >=0 if ok, <0 errno code on error.
1341 static int __sctp_setsockopt_connectx(struct sock *sk,
1342 struct sockaddr __user *addrs,
1344 sctp_assoc_t *assoc_id)
1346 struct sockaddr *kaddrs;
1347 gfp_t gfp = GFP_KERNEL;
1350 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1351 __func__, sk, addrs, addrs_size);
1353 if (unlikely(addrs_size <= 0))
1356 /* Check the user passed a healthy pointer. */
1357 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1360 /* Alloc space for the address array in kernel memory. */
1361 if (sk->sk_socket->file)
1362 gfp = GFP_USER | __GFP_NOWARN;
1363 kaddrs = kmalloc(addrs_size, gfp);
1364 if (unlikely(!kaddrs))
1367 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1370 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1379 * This is an older interface. It's kept for backward compatibility
1380 * to the option that doesn't provide association id.
1382 static int sctp_setsockopt_connectx_old(struct sock *sk,
1383 struct sockaddr __user *addrs,
1386 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1390 * New interface for the API. The since the API is done with a socket
1391 * option, to make it simple we feed back the association id is as a return
1392 * indication to the call. Error is always negative and association id is
1395 static int sctp_setsockopt_connectx(struct sock *sk,
1396 struct sockaddr __user *addrs,
1399 sctp_assoc_t assoc_id = 0;
1402 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1411 * New (hopefully final) interface for the API.
1412 * We use the sctp_getaddrs_old structure so that use-space library
1413 * can avoid any unnecessary allocations. The only different part
1414 * is that we store the actual length of the address buffer into the
1415 * addrs_num structure member. That way we can re-use the existing
1418 #ifdef CONFIG_COMPAT
1419 struct compat_sctp_getaddrs_old {
1420 sctp_assoc_t assoc_id;
1422 compat_uptr_t addrs; /* struct sockaddr * */
1426 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1427 char __user *optval,
1430 struct sctp_getaddrs_old param;
1431 sctp_assoc_t assoc_id = 0;
1434 #ifdef CONFIG_COMPAT
1435 if (in_compat_syscall()) {
1436 struct compat_sctp_getaddrs_old param32;
1438 if (len < sizeof(param32))
1440 if (copy_from_user(¶m32, optval, sizeof(param32)))
1443 param.assoc_id = param32.assoc_id;
1444 param.addr_num = param32.addr_num;
1445 param.addrs = compat_ptr(param32.addrs);
1449 if (len < sizeof(param))
1451 if (copy_from_user(¶m, optval, sizeof(param)))
1455 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1456 param.addrs, param.addr_num,
1458 if (err == 0 || err == -EINPROGRESS) {
1459 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1461 if (put_user(sizeof(assoc_id), optlen))
1468 /* API 3.1.4 close() - UDP Style Syntax
1469 * Applications use close() to perform graceful shutdown (as described in
1470 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1471 * by a UDP-style socket.
1475 * ret = close(int sd);
1477 * sd - the socket descriptor of the associations to be closed.
1479 * To gracefully shutdown a specific association represented by the
1480 * UDP-style socket, an application should use the sendmsg() call,
1481 * passing no user data, but including the appropriate flag in the
1482 * ancillary data (see Section xxxx).
1484 * If sd in the close() call is a branched-off socket representing only
1485 * one association, the shutdown is performed on that association only.
1487 * 4.1.6 close() - TCP Style Syntax
1489 * Applications use close() to gracefully close down an association.
1493 * int close(int sd);
1495 * sd - the socket descriptor of the association to be closed.
1497 * After an application calls close() on a socket descriptor, no further
1498 * socket operations will succeed on that descriptor.
1500 * API 7.1.4 SO_LINGER
1502 * An application using the TCP-style socket can use this option to
1503 * perform the SCTP ABORT primitive. The linger option structure is:
1506 * int l_onoff; // option on/off
1507 * int l_linger; // linger time
1510 * To enable the option, set l_onoff to 1. If the l_linger value is set
1511 * to 0, calling close() is the same as the ABORT primitive. If the
1512 * value is set to a negative value, the setsockopt() call will return
1513 * an error. If the value is set to a positive value linger_time, the
1514 * close() can be blocked for at most linger_time ms. If the graceful
1515 * shutdown phase does not finish during this period, close() will
1516 * return but the graceful shutdown phase continues in the system.
1518 static void sctp_close(struct sock *sk, long timeout)
1520 struct net *net = sock_net(sk);
1521 struct sctp_endpoint *ep;
1522 struct sctp_association *asoc;
1523 struct list_head *pos, *temp;
1524 unsigned int data_was_unread;
1526 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1528 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1529 sk->sk_shutdown = SHUTDOWN_MASK;
1530 sk->sk_state = SCTP_SS_CLOSING;
1532 ep = sctp_sk(sk)->ep;
1534 /* Clean up any skbs sitting on the receive queue. */
1535 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1536 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1538 /* Walk all associations on an endpoint. */
1539 list_for_each_safe(pos, temp, &ep->asocs) {
1540 asoc = list_entry(pos, struct sctp_association, asocs);
1542 if (sctp_style(sk, TCP)) {
1543 /* A closed association can still be in the list if
1544 * it belongs to a TCP-style listening socket that is
1545 * not yet accepted. If so, free it. If not, send an
1546 * ABORT or SHUTDOWN based on the linger options.
1548 if (sctp_state(asoc, CLOSED)) {
1549 sctp_association_free(asoc);
1554 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1555 !skb_queue_empty(&asoc->ulpq.reasm) ||
1556 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1557 struct sctp_chunk *chunk;
1559 chunk = sctp_make_abort_user(asoc, NULL, 0);
1560 sctp_primitive_ABORT(net, asoc, chunk);
1562 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1565 /* On a TCP-style socket, block for at most linger_time if set. */
1566 if (sctp_style(sk, TCP) && timeout)
1567 sctp_wait_for_close(sk, timeout);
1569 /* This will run the backlog queue. */
1572 /* Supposedly, no process has access to the socket, but
1573 * the net layers still may.
1574 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1575 * held and that should be grabbed before socket lock.
1577 spin_lock_bh(&net->sctp.addr_wq_lock);
1578 bh_lock_sock_nested(sk);
1580 /* Hold the sock, since sk_common_release() will put sock_put()
1581 * and we have just a little more cleanup.
1584 sk_common_release(sk);
1587 spin_unlock_bh(&net->sctp.addr_wq_lock);
1591 SCTP_DBG_OBJCNT_DEC(sock);
1594 /* Handle EPIPE error. */
1595 static int sctp_error(struct sock *sk, int flags, int err)
1598 err = sock_error(sk) ? : -EPIPE;
1599 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1600 send_sig(SIGPIPE, current, 0);
1604 /* API 3.1.3 sendmsg() - UDP Style Syntax
1606 * An application uses sendmsg() and recvmsg() calls to transmit data to
1607 * and receive data from its peer.
1609 * ssize_t sendmsg(int socket, const struct msghdr *message,
1612 * socket - the socket descriptor of the endpoint.
1613 * message - pointer to the msghdr structure which contains a single
1614 * user message and possibly some ancillary data.
1616 * See Section 5 for complete description of the data
1619 * flags - flags sent or received with the user message, see Section
1620 * 5 for complete description of the flags.
1622 * Note: This function could use a rewrite especially when explicit
1623 * connect support comes in.
1625 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1627 static int sctp_msghdr_parse(const struct msghdr *msg,
1628 struct sctp_cmsgs *cmsgs);
1630 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1632 struct net *net = sock_net(sk);
1633 struct sctp_sock *sp;
1634 struct sctp_endpoint *ep;
1635 struct sctp_association *new_asoc = NULL, *asoc = NULL;
1636 struct sctp_transport *transport, *chunk_tp;
1637 struct sctp_chunk *chunk;
1639 struct sockaddr *msg_name = NULL;
1640 struct sctp_sndrcvinfo default_sinfo;
1641 struct sctp_sndrcvinfo *sinfo;
1642 struct sctp_initmsg *sinit;
1643 sctp_assoc_t associd = 0;
1644 struct sctp_cmsgs cmsgs = { NULL };
1645 enum sctp_scope scope;
1646 bool fill_sinfo_ttl = false, wait_connect = false;
1647 struct sctp_datamsg *datamsg;
1648 int msg_flags = msg->msg_flags;
1649 __u16 sinfo_flags = 0;
1657 pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1660 /* We cannot send a message over a TCP-style listening socket. */
1661 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1666 /* Parse out the SCTP CMSGs. */
1667 err = sctp_msghdr_parse(msg, &cmsgs);
1669 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1673 /* Fetch the destination address for this packet. This
1674 * address only selects the association--it is not necessarily
1675 * the address we will send to.
1676 * For a peeled-off socket, msg_name is ignored.
1678 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1679 int msg_namelen = msg->msg_namelen;
1681 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1686 if (msg_namelen > sizeof(to))
1687 msg_namelen = sizeof(to);
1688 memcpy(&to, msg->msg_name, msg_namelen);
1689 msg_name = msg->msg_name;
1693 if (cmsgs.sinfo != NULL) {
1694 memset(&default_sinfo, 0, sizeof(default_sinfo));
1695 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1696 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1697 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1698 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1699 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1701 sinfo = &default_sinfo;
1702 fill_sinfo_ttl = true;
1704 sinfo = cmsgs.srinfo;
1706 /* Did the user specify SNDINFO/SNDRCVINFO? */
1708 sinfo_flags = sinfo->sinfo_flags;
1709 associd = sinfo->sinfo_assoc_id;
1712 pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1713 msg_len, sinfo_flags);
1715 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1716 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1721 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1722 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1723 * If SCTP_ABORT is set, the message length could be non zero with
1724 * the msg_iov set to the user abort reason.
1726 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1727 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1732 /* If SCTP_ADDR_OVER is set, there must be an address
1733 * specified in msg_name.
1735 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1742 pr_debug("%s: about to look up association\n", __func__);
1746 /* If a msg_name has been specified, assume this is to be used. */
1748 /* Look for a matching association on the endpoint. */
1749 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1751 /* If we could not find a matching association on the
1752 * endpoint, make sure that it is not a TCP-style
1753 * socket that already has an association or there is
1754 * no peeled-off association on another socket.
1757 ((sctp_style(sk, TCP) &&
1758 (sctp_sstate(sk, ESTABLISHED) ||
1759 sctp_sstate(sk, CLOSING))) ||
1760 sctp_endpoint_is_peeled_off(ep, &to))) {
1761 err = -EADDRNOTAVAIL;
1765 asoc = sctp_id2assoc(sk, associd);
1773 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1775 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1776 * socket that has an association in CLOSED state. This can
1777 * happen when an accepted socket has an association that is
1780 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1785 if (sinfo_flags & SCTP_EOF) {
1786 pr_debug("%s: shutting down association:%p\n",
1789 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1793 if (sinfo_flags & SCTP_ABORT) {
1795 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1801 pr_debug("%s: aborting association:%p\n",
1804 sctp_primitive_ABORT(net, asoc, chunk);
1810 /* Do we need to create the association? */
1812 pr_debug("%s: there is no association yet\n", __func__);
1814 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1819 /* Check for invalid stream against the stream counts,
1820 * either the default or the user specified stream counts.
1823 if (!sinit || !sinit->sinit_num_ostreams) {
1824 /* Check against the defaults. */
1825 if (sinfo->sinfo_stream >=
1826 sp->initmsg.sinit_num_ostreams) {
1831 /* Check against the requested. */
1832 if (sinfo->sinfo_stream >=
1833 sinit->sinit_num_ostreams) {
1841 * API 3.1.2 bind() - UDP Style Syntax
1842 * If a bind() or sctp_bindx() is not called prior to a
1843 * sendmsg() call that initiates a new association, the
1844 * system picks an ephemeral port and will choose an address
1845 * set equivalent to binding with a wildcard address.
1847 if (!ep->base.bind_addr.port) {
1848 if (sctp_autobind(sk)) {
1854 * If an unprivileged user inherits a one-to-many
1855 * style socket with open associations on a privileged
1856 * port, it MAY be permitted to accept new associations,
1857 * but it SHOULD NOT be permitted to open new
1860 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1861 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1867 scope = sctp_scope(&to);
1868 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1874 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1880 /* If the SCTP_INIT ancillary data is specified, set all
1881 * the association init values accordingly.
1884 if (sinit->sinit_num_ostreams) {
1885 asoc->c.sinit_num_ostreams =
1886 sinit->sinit_num_ostreams;
1888 if (sinit->sinit_max_instreams) {
1889 asoc->c.sinit_max_instreams =
1890 sinit->sinit_max_instreams;
1892 if (sinit->sinit_max_attempts) {
1893 asoc->max_init_attempts
1894 = sinit->sinit_max_attempts;
1896 if (sinit->sinit_max_init_timeo) {
1897 asoc->max_init_timeo =
1898 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1902 /* Prime the peer's transport structures. */
1903 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1910 /* ASSERT: we have a valid association at this point. */
1911 pr_debug("%s: we have a valid association\n", __func__);
1914 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1915 * one with some defaults.
1917 memset(&default_sinfo, 0, sizeof(default_sinfo));
1918 default_sinfo.sinfo_stream = asoc->default_stream;
1919 default_sinfo.sinfo_flags = asoc->default_flags;
1920 default_sinfo.sinfo_ppid = asoc->default_ppid;
1921 default_sinfo.sinfo_context = asoc->default_context;
1922 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1923 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1925 sinfo = &default_sinfo;
1926 } else if (fill_sinfo_ttl) {
1927 /* In case SNDINFO was specified, we still need to fill
1928 * it with a default ttl from the assoc here.
1930 sinfo->sinfo_timetolive = asoc->default_timetolive;
1933 /* API 7.1.7, the sndbuf size per association bounds the
1934 * maximum size of data that can be sent in a single send call.
1936 if (msg_len > sk->sk_sndbuf) {
1941 if (asoc->pmtu_pending)
1942 sctp_assoc_pending_pmtu(asoc);
1944 /* If fragmentation is disabled and the message length exceeds the
1945 * association fragmentation point, return EMSGSIZE. The I-D
1946 * does not specify what this error is, but this looks like
1949 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1954 /* Check for invalid stream. */
1955 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1960 if (sctp_wspace(asoc) < msg_len)
1961 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1963 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1964 if (!sctp_wspace(asoc)) {
1965 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1970 /* If an address is passed with the sendto/sendmsg call, it is used
1971 * to override the primary destination address in the TCP model, or
1972 * when SCTP_ADDR_OVER flag is set in the UDP model.
1974 if ((sctp_style(sk, TCP) && msg_name) ||
1975 (sinfo_flags & SCTP_ADDR_OVER)) {
1976 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1984 /* Auto-connect, if we aren't connected already. */
1985 if (sctp_state(asoc, CLOSED)) {
1986 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1990 wait_connect = true;
1991 pr_debug("%s: we associated primitively\n", __func__);
1994 /* Break the message into multiple chunks of maximum size. */
1995 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1996 if (IS_ERR(datamsg)) {
1997 err = PTR_ERR(datamsg);
2000 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
2002 /* Now send the (possibly) fragmented message. */
2003 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
2004 sctp_chunk_hold(chunk);
2006 /* Do accounting for the write space. */
2007 sctp_set_owner_w(chunk);
2009 chunk->transport = chunk_tp;
2012 /* Send it to the lower layers. Note: all chunks
2013 * must either fail or succeed. The lower layer
2014 * works that way today. Keep it that way or this
2017 err = sctp_primitive_SEND(net, asoc, datamsg);
2018 /* Did the lower layer accept the chunk? */
2020 sctp_datamsg_free(datamsg);
2024 pr_debug("%s: we sent primitively\n", __func__);
2026 sctp_datamsg_put(datamsg);
2029 if (unlikely(wait_connect)) {
2030 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
2031 sctp_wait_for_connect(asoc, &timeo);
2034 /* If we are already past ASSOCIATE, the lower
2035 * layers are responsible for association cleanup.
2041 sctp_association_free(asoc);
2046 return sctp_error(sk, msg_flags, err);
2053 err = sock_error(sk);
2063 /* This is an extended version of skb_pull() that removes the data from the
2064 * start of a skb even when data is spread across the list of skb's in the
2065 * frag_list. len specifies the total amount of data that needs to be removed.
2066 * when 'len' bytes could be removed from the skb, it returns 0.
2067 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2068 * could not be removed.
2070 static int sctp_skb_pull(struct sk_buff *skb, int len)
2072 struct sk_buff *list;
2073 int skb_len = skb_headlen(skb);
2076 if (len <= skb_len) {
2077 __skb_pull(skb, len);
2081 __skb_pull(skb, skb_len);
2083 skb_walk_frags(skb, list) {
2084 rlen = sctp_skb_pull(list, len);
2085 skb->len -= (len-rlen);
2086 skb->data_len -= (len-rlen);
2097 /* API 3.1.3 recvmsg() - UDP Style Syntax
2099 * ssize_t recvmsg(int socket, struct msghdr *message,
2102 * socket - the socket descriptor of the endpoint.
2103 * message - pointer to the msghdr structure which contains a single
2104 * user message and possibly some ancillary data.
2106 * See Section 5 for complete description of the data
2109 * flags - flags sent or received with the user message, see Section
2110 * 5 for complete description of the flags.
2112 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2113 int noblock, int flags, int *addr_len)
2115 struct sctp_ulpevent *event = NULL;
2116 struct sctp_sock *sp = sctp_sk(sk);
2117 struct sk_buff *skb, *head_skb;
2122 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2123 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2128 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2129 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2134 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2138 /* Get the total length of the skb including any skb's in the
2147 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2149 event = sctp_skb2event(skb);
2154 if (event->chunk && event->chunk->head_skb)
2155 head_skb = event->chunk->head_skb;
2158 sock_recv_ts_and_drops(msg, sk, head_skb);
2159 if (sctp_ulpevent_is_notification(event)) {
2160 msg->msg_flags |= MSG_NOTIFICATION;
2161 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2163 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2166 /* Check if we allow SCTP_NXTINFO. */
2167 if (sp->recvnxtinfo)
2168 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2169 /* Check if we allow SCTP_RCVINFO. */
2170 if (sp->recvrcvinfo)
2171 sctp_ulpevent_read_rcvinfo(event, msg);
2172 /* Check if we allow SCTP_SNDRCVINFO. */
2173 if (sp->subscribe.sctp_data_io_event)
2174 sctp_ulpevent_read_sndrcvinfo(event, msg);
2178 /* If skb's length exceeds the user's buffer, update the skb and
2179 * push it back to the receive_queue so that the next call to
2180 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2182 if (skb_len > copied) {
2183 msg->msg_flags &= ~MSG_EOR;
2184 if (flags & MSG_PEEK)
2186 sctp_skb_pull(skb, copied);
2187 skb_queue_head(&sk->sk_receive_queue, skb);
2189 /* When only partial message is copied to the user, increase
2190 * rwnd by that amount. If all the data in the skb is read,
2191 * rwnd is updated when the event is freed.
2193 if (!sctp_ulpevent_is_notification(event))
2194 sctp_assoc_rwnd_increase(event->asoc, copied);
2196 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2197 (event->msg_flags & MSG_EOR))
2198 msg->msg_flags |= MSG_EOR;
2200 msg->msg_flags &= ~MSG_EOR;
2203 if (flags & MSG_PEEK) {
2204 /* Release the skb reference acquired after peeking the skb in
2205 * sctp_skb_recv_datagram().
2209 /* Free the event which includes releasing the reference to
2210 * the owner of the skb, freeing the skb and updating the
2213 sctp_ulpevent_free(event);
2220 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2222 * This option is a on/off flag. If enabled no SCTP message
2223 * fragmentation will be performed. Instead if a message being sent
2224 * exceeds the current PMTU size, the message will NOT be sent and
2225 * instead a error will be indicated to the user.
2227 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2228 char __user *optval,
2229 unsigned int optlen)
2233 if (optlen < sizeof(int))
2236 if (get_user(val, (int __user *)optval))
2239 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2244 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2245 unsigned int optlen)
2247 struct sctp_association *asoc;
2248 struct sctp_ulpevent *event;
2250 if (optlen > sizeof(struct sctp_event_subscribe))
2252 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2255 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2256 * if there is no data to be sent or retransmit, the stack will
2257 * immediately send up this notification.
2259 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2260 &sctp_sk(sk)->subscribe)) {
2261 asoc = sctp_id2assoc(sk, 0);
2263 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2264 event = sctp_ulpevent_make_sender_dry_event(asoc,
2269 sctp_ulpq_tail_event(&asoc->ulpq, event);
2276 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2278 * This socket option is applicable to the UDP-style socket only. When
2279 * set it will cause associations that are idle for more than the
2280 * specified number of seconds to automatically close. An association
2281 * being idle is defined an association that has NOT sent or received
2282 * user data. The special value of '0' indicates that no automatic
2283 * close of any associations should be performed. The option expects an
2284 * integer defining the number of seconds of idle time before an
2285 * association is closed.
2287 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2288 unsigned int optlen)
2290 struct sctp_sock *sp = sctp_sk(sk);
2291 struct net *net = sock_net(sk);
2293 /* Applicable to UDP-style socket only */
2294 if (sctp_style(sk, TCP))
2296 if (optlen != sizeof(int))
2298 if (copy_from_user(&sp->autoclose, optval, optlen))
2301 if (sp->autoclose > net->sctp.max_autoclose)
2302 sp->autoclose = net->sctp.max_autoclose;
2307 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2309 * Applications can enable or disable heartbeats for any peer address of
2310 * an association, modify an address's heartbeat interval, force a
2311 * heartbeat to be sent immediately, and adjust the address's maximum
2312 * number of retransmissions sent before an address is considered
2313 * unreachable. The following structure is used to access and modify an
2314 * address's parameters:
2316 * struct sctp_paddrparams {
2317 * sctp_assoc_t spp_assoc_id;
2318 * struct sockaddr_storage spp_address;
2319 * uint32_t spp_hbinterval;
2320 * uint16_t spp_pathmaxrxt;
2321 * uint32_t spp_pathmtu;
2322 * uint32_t spp_sackdelay;
2323 * uint32_t spp_flags;
2326 * spp_assoc_id - (one-to-many style socket) This is filled in the
2327 * application, and identifies the association for
2329 * spp_address - This specifies which address is of interest.
2330 * spp_hbinterval - This contains the value of the heartbeat interval,
2331 * in milliseconds. If a value of zero
2332 * is present in this field then no changes are to
2333 * be made to this parameter.
2334 * spp_pathmaxrxt - This contains the maximum number of
2335 * retransmissions before this address shall be
2336 * considered unreachable. If a value of zero
2337 * is present in this field then no changes are to
2338 * be made to this parameter.
2339 * spp_pathmtu - When Path MTU discovery is disabled the value
2340 * specified here will be the "fixed" path mtu.
2341 * Note that if the spp_address field is empty
2342 * then all associations on this address will
2343 * have this fixed path mtu set upon them.
2345 * spp_sackdelay - When delayed sack is enabled, this value specifies
2346 * the number of milliseconds that sacks will be delayed
2347 * for. This value will apply to all addresses of an
2348 * association if the spp_address field is empty. Note
2349 * also, that if delayed sack is enabled and this
2350 * value is set to 0, no change is made to the last
2351 * recorded delayed sack timer value.
2353 * spp_flags - These flags are used to control various features
2354 * on an association. The flag field may contain
2355 * zero or more of the following options.
2357 * SPP_HB_ENABLE - Enable heartbeats on the
2358 * specified address. Note that if the address
2359 * field is empty all addresses for the association
2360 * have heartbeats enabled upon them.
2362 * SPP_HB_DISABLE - Disable heartbeats on the
2363 * speicifed address. Note that if the address
2364 * field is empty all addresses for the association
2365 * will have their heartbeats disabled. Note also
2366 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2367 * mutually exclusive, only one of these two should
2368 * be specified. Enabling both fields will have
2369 * undetermined results.
2371 * SPP_HB_DEMAND - Request a user initiated heartbeat
2372 * to be made immediately.
2374 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2375 * heartbeat delayis to be set to the value of 0
2378 * SPP_PMTUD_ENABLE - This field will enable PMTU
2379 * discovery upon the specified address. Note that
2380 * if the address feild is empty then all addresses
2381 * on the association are effected.
2383 * SPP_PMTUD_DISABLE - This field will disable PMTU
2384 * discovery upon the specified address. Note that
2385 * if the address feild is empty then all addresses
2386 * on the association are effected. Not also that
2387 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2388 * exclusive. Enabling both will have undetermined
2391 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2392 * on delayed sack. The time specified in spp_sackdelay
2393 * is used to specify the sack delay for this address. Note
2394 * that if spp_address is empty then all addresses will
2395 * enable delayed sack and take on the sack delay
2396 * value specified in spp_sackdelay.
2397 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2398 * off delayed sack. If the spp_address field is blank then
2399 * delayed sack is disabled for the entire association. Note
2400 * also that this field is mutually exclusive to
2401 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2404 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2405 struct sctp_transport *trans,
2406 struct sctp_association *asoc,
2407 struct sctp_sock *sp,
2410 int sackdelay_change)
2414 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2415 struct net *net = sock_net(trans->asoc->base.sk);
2417 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2422 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2423 * this field is ignored. Note also that a value of zero indicates
2424 * the current setting should be left unchanged.
2426 if (params->spp_flags & SPP_HB_ENABLE) {
2428 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2429 * set. This lets us use 0 value when this flag
2432 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2433 params->spp_hbinterval = 0;
2435 if (params->spp_hbinterval ||
2436 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2439 msecs_to_jiffies(params->spp_hbinterval);
2442 msecs_to_jiffies(params->spp_hbinterval);
2444 sp->hbinterval = params->spp_hbinterval;
2451 trans->param_flags =
2452 (trans->param_flags & ~SPP_HB) | hb_change;
2455 (asoc->param_flags & ~SPP_HB) | hb_change;
2458 (sp->param_flags & ~SPP_HB) | hb_change;
2462 /* When Path MTU discovery is disabled the value specified here will
2463 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2464 * include the flag SPP_PMTUD_DISABLE for this field to have any
2467 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2469 trans->pathmtu = params->spp_pathmtu;
2470 sctp_assoc_sync_pmtu(asoc);
2472 asoc->pathmtu = params->spp_pathmtu;
2474 sp->pathmtu = params->spp_pathmtu;
2480 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2481 (params->spp_flags & SPP_PMTUD_ENABLE);
2482 trans->param_flags =
2483 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2485 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2486 sctp_assoc_sync_pmtu(asoc);
2490 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2493 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2497 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2498 * value of this field is ignored. Note also that a value of zero
2499 * indicates the current setting should be left unchanged.
2501 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2504 msecs_to_jiffies(params->spp_sackdelay);
2507 msecs_to_jiffies(params->spp_sackdelay);
2509 sp->sackdelay = params->spp_sackdelay;
2513 if (sackdelay_change) {
2515 trans->param_flags =
2516 (trans->param_flags & ~SPP_SACKDELAY) |
2520 (asoc->param_flags & ~SPP_SACKDELAY) |
2524 (sp->param_flags & ~SPP_SACKDELAY) |
2529 /* Note that a value of zero indicates the current setting should be
2532 if (params->spp_pathmaxrxt) {
2534 trans->pathmaxrxt = params->spp_pathmaxrxt;
2536 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2538 sp->pathmaxrxt = params->spp_pathmaxrxt;
2545 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2546 char __user *optval,
2547 unsigned int optlen)
2549 struct sctp_paddrparams params;
2550 struct sctp_transport *trans = NULL;
2551 struct sctp_association *asoc = NULL;
2552 struct sctp_sock *sp = sctp_sk(sk);
2554 int hb_change, pmtud_change, sackdelay_change;
2556 if (optlen != sizeof(struct sctp_paddrparams))
2559 if (copy_from_user(¶ms, optval, optlen))
2562 /* Validate flags and value parameters. */
2563 hb_change = params.spp_flags & SPP_HB;
2564 pmtud_change = params.spp_flags & SPP_PMTUD;
2565 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2567 if (hb_change == SPP_HB ||
2568 pmtud_change == SPP_PMTUD ||
2569 sackdelay_change == SPP_SACKDELAY ||
2570 params.spp_sackdelay > 500 ||
2571 (params.spp_pathmtu &&
2572 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2575 /* If an address other than INADDR_ANY is specified, and
2576 * no transport is found, then the request is invalid.
2578 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2579 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2580 params.spp_assoc_id);
2585 /* Get association, if assoc_id != 0 and the socket is a one
2586 * to many style socket, and an association was not found, then
2587 * the id was invalid.
2589 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2590 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2593 /* Heartbeat demand can only be sent on a transport or
2594 * association, but not a socket.
2596 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2599 /* Process parameters. */
2600 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2601 hb_change, pmtud_change,
2607 /* If changes are for association, also apply parameters to each
2610 if (!trans && asoc) {
2611 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2613 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2614 hb_change, pmtud_change,
2622 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2624 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2627 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2629 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2633 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2635 * This option will effect the way delayed acks are performed. This
2636 * option allows you to get or set the delayed ack time, in
2637 * milliseconds. It also allows changing the delayed ack frequency.
2638 * Changing the frequency to 1 disables the delayed sack algorithm. If
2639 * the assoc_id is 0, then this sets or gets the endpoints default
2640 * values. If the assoc_id field is non-zero, then the set or get
2641 * effects the specified association for the one to many model (the
2642 * assoc_id field is ignored by the one to one model). Note that if
2643 * sack_delay or sack_freq are 0 when setting this option, then the
2644 * current values will remain unchanged.
2646 * struct sctp_sack_info {
2647 * sctp_assoc_t sack_assoc_id;
2648 * uint32_t sack_delay;
2649 * uint32_t sack_freq;
2652 * sack_assoc_id - This parameter, indicates which association the user
2653 * is performing an action upon. Note that if this field's value is
2654 * zero then the endpoints default value is changed (effecting future
2655 * associations only).
2657 * sack_delay - This parameter contains the number of milliseconds that
2658 * the user is requesting the delayed ACK timer be set to. Note that
2659 * this value is defined in the standard to be between 200 and 500
2662 * sack_freq - This parameter contains the number of packets that must
2663 * be received before a sack is sent without waiting for the delay
2664 * timer to expire. The default value for this is 2, setting this
2665 * value to 1 will disable the delayed sack algorithm.
2668 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2669 char __user *optval, unsigned int optlen)
2671 struct sctp_sack_info params;
2672 struct sctp_transport *trans = NULL;
2673 struct sctp_association *asoc = NULL;
2674 struct sctp_sock *sp = sctp_sk(sk);
2676 if (optlen == sizeof(struct sctp_sack_info)) {
2677 if (copy_from_user(¶ms, optval, optlen))
2680 if (params.sack_delay == 0 && params.sack_freq == 0)
2682 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2683 pr_warn_ratelimited(DEPRECATED
2685 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2686 "Use struct sctp_sack_info instead\n",
2687 current->comm, task_pid_nr(current));
2688 if (copy_from_user(¶ms, optval, optlen))
2691 if (params.sack_delay == 0)
2692 params.sack_freq = 1;
2694 params.sack_freq = 0;
2698 /* Validate value parameter. */
2699 if (params.sack_delay > 500)
2702 /* Get association, if sack_assoc_id != 0 and the socket is a one
2703 * to many style socket, and an association was not found, then
2704 * the id was invalid.
2706 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2707 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2710 if (params.sack_delay) {
2713 msecs_to_jiffies(params.sack_delay);
2715 sctp_spp_sackdelay_enable(asoc->param_flags);
2717 sp->sackdelay = params.sack_delay;
2719 sctp_spp_sackdelay_enable(sp->param_flags);
2723 if (params.sack_freq == 1) {
2726 sctp_spp_sackdelay_disable(asoc->param_flags);
2729 sctp_spp_sackdelay_disable(sp->param_flags);
2731 } else if (params.sack_freq > 1) {
2733 asoc->sackfreq = params.sack_freq;
2735 sctp_spp_sackdelay_enable(asoc->param_flags);
2737 sp->sackfreq = params.sack_freq;
2739 sctp_spp_sackdelay_enable(sp->param_flags);
2743 /* If change is for association, also apply to each transport. */
2745 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2747 if (params.sack_delay) {
2749 msecs_to_jiffies(params.sack_delay);
2750 trans->param_flags =
2751 sctp_spp_sackdelay_enable(trans->param_flags);
2753 if (params.sack_freq == 1) {
2754 trans->param_flags =
2755 sctp_spp_sackdelay_disable(trans->param_flags);
2756 } else if (params.sack_freq > 1) {
2757 trans->sackfreq = params.sack_freq;
2758 trans->param_flags =
2759 sctp_spp_sackdelay_enable(trans->param_flags);
2767 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2769 * Applications can specify protocol parameters for the default association
2770 * initialization. The option name argument to setsockopt() and getsockopt()
2773 * Setting initialization parameters is effective only on an unconnected
2774 * socket (for UDP-style sockets only future associations are effected
2775 * by the change). With TCP-style sockets, this option is inherited by
2776 * sockets derived from a listener socket.
2778 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2780 struct sctp_initmsg sinit;
2781 struct sctp_sock *sp = sctp_sk(sk);
2783 if (optlen != sizeof(struct sctp_initmsg))
2785 if (copy_from_user(&sinit, optval, optlen))
2788 if (sinit.sinit_num_ostreams)
2789 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2790 if (sinit.sinit_max_instreams)
2791 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2792 if (sinit.sinit_max_attempts)
2793 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2794 if (sinit.sinit_max_init_timeo)
2795 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2801 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2803 * Applications that wish to use the sendto() system call may wish to
2804 * specify a default set of parameters that would normally be supplied
2805 * through the inclusion of ancillary data. This socket option allows
2806 * such an application to set the default sctp_sndrcvinfo structure.
2807 * The application that wishes to use this socket option simply passes
2808 * in to this call the sctp_sndrcvinfo structure defined in Section
2809 * 5.2.2) The input parameters accepted by this call include
2810 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2811 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2812 * to this call if the caller is using the UDP model.
2814 static int sctp_setsockopt_default_send_param(struct sock *sk,
2815 char __user *optval,
2816 unsigned int optlen)
2818 struct sctp_sock *sp = sctp_sk(sk);
2819 struct sctp_association *asoc;
2820 struct sctp_sndrcvinfo info;
2822 if (optlen != sizeof(info))
2824 if (copy_from_user(&info, optval, optlen))
2826 if (info.sinfo_flags &
2827 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2828 SCTP_ABORT | SCTP_EOF))
2831 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2832 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2835 asoc->default_stream = info.sinfo_stream;
2836 asoc->default_flags = info.sinfo_flags;
2837 asoc->default_ppid = info.sinfo_ppid;
2838 asoc->default_context = info.sinfo_context;
2839 asoc->default_timetolive = info.sinfo_timetolive;
2841 sp->default_stream = info.sinfo_stream;
2842 sp->default_flags = info.sinfo_flags;
2843 sp->default_ppid = info.sinfo_ppid;
2844 sp->default_context = info.sinfo_context;
2845 sp->default_timetolive = info.sinfo_timetolive;
2851 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2852 * (SCTP_DEFAULT_SNDINFO)
2854 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2855 char __user *optval,
2856 unsigned int optlen)
2858 struct sctp_sock *sp = sctp_sk(sk);
2859 struct sctp_association *asoc;
2860 struct sctp_sndinfo info;
2862 if (optlen != sizeof(info))
2864 if (copy_from_user(&info, optval, optlen))
2866 if (info.snd_flags &
2867 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2868 SCTP_ABORT | SCTP_EOF))
2871 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2872 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2875 asoc->default_stream = info.snd_sid;
2876 asoc->default_flags = info.snd_flags;
2877 asoc->default_ppid = info.snd_ppid;
2878 asoc->default_context = info.snd_context;
2880 sp->default_stream = info.snd_sid;
2881 sp->default_flags = info.snd_flags;
2882 sp->default_ppid = info.snd_ppid;
2883 sp->default_context = info.snd_context;
2889 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2891 * Requests that the local SCTP stack use the enclosed peer address as
2892 * the association primary. The enclosed address must be one of the
2893 * association peer's addresses.
2895 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2896 unsigned int optlen)
2898 struct sctp_prim prim;
2899 struct sctp_transport *trans;
2901 if (optlen != sizeof(struct sctp_prim))
2904 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2907 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2911 sctp_assoc_set_primary(trans->asoc, trans);
2917 * 7.1.5 SCTP_NODELAY
2919 * Turn on/off any Nagle-like algorithm. This means that packets are
2920 * generally sent as soon as possible and no unnecessary delays are
2921 * introduced, at the cost of more packets in the network. Expects an
2922 * integer boolean flag.
2924 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2925 unsigned int optlen)
2929 if (optlen < sizeof(int))
2931 if (get_user(val, (int __user *)optval))
2934 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2940 * 7.1.1 SCTP_RTOINFO
2942 * The protocol parameters used to initialize and bound retransmission
2943 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2944 * and modify these parameters.
2945 * All parameters are time values, in milliseconds. A value of 0, when
2946 * modifying the parameters, indicates that the current value should not
2950 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2952 struct sctp_rtoinfo rtoinfo;
2953 struct sctp_association *asoc;
2954 unsigned long rto_min, rto_max;
2955 struct sctp_sock *sp = sctp_sk(sk);
2957 if (optlen != sizeof (struct sctp_rtoinfo))
2960 if (copy_from_user(&rtoinfo, optval, optlen))
2963 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2965 /* Set the values to the specific association */
2966 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2969 rto_max = rtoinfo.srto_max;
2970 rto_min = rtoinfo.srto_min;
2973 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2975 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2978 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2980 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2982 if (rto_min > rto_max)
2986 if (rtoinfo.srto_initial != 0)
2988 msecs_to_jiffies(rtoinfo.srto_initial);
2989 asoc->rto_max = rto_max;
2990 asoc->rto_min = rto_min;
2992 /* If there is no association or the association-id = 0
2993 * set the values to the endpoint.
2995 if (rtoinfo.srto_initial != 0)
2996 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2997 sp->rtoinfo.srto_max = rto_max;
2998 sp->rtoinfo.srto_min = rto_min;
3006 * 7.1.2 SCTP_ASSOCINFO
3008 * This option is used to tune the maximum retransmission attempts
3009 * of the association.
3010 * Returns an error if the new association retransmission value is
3011 * greater than the sum of the retransmission value of the peer.
3012 * See [SCTP] for more information.
3015 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3018 struct sctp_assocparams assocparams;
3019 struct sctp_association *asoc;
3021 if (optlen != sizeof(struct sctp_assocparams))
3023 if (copy_from_user(&assocparams, optval, optlen))
3026 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3028 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3031 /* Set the values to the specific association */
3033 if (assocparams.sasoc_asocmaxrxt != 0) {
3036 struct sctp_transport *peer_addr;
3038 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3040 path_sum += peer_addr->pathmaxrxt;
3044 /* Only validate asocmaxrxt if we have more than
3045 * one path/transport. We do this because path
3046 * retransmissions are only counted when we have more
3050 assocparams.sasoc_asocmaxrxt > path_sum)
3053 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3056 if (assocparams.sasoc_cookie_life != 0)
3057 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3059 /* Set the values to the endpoint */
3060 struct sctp_sock *sp = sctp_sk(sk);
3062 if (assocparams.sasoc_asocmaxrxt != 0)
3063 sp->assocparams.sasoc_asocmaxrxt =
3064 assocparams.sasoc_asocmaxrxt;
3065 if (assocparams.sasoc_cookie_life != 0)
3066 sp->assocparams.sasoc_cookie_life =
3067 assocparams.sasoc_cookie_life;
3073 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3075 * This socket option is a boolean flag which turns on or off mapped V4
3076 * addresses. If this option is turned on and the socket is type
3077 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3078 * If this option is turned off, then no mapping will be done of V4
3079 * addresses and a user will receive both PF_INET6 and PF_INET type
3080 * addresses on the socket.
3082 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3085 struct sctp_sock *sp = sctp_sk(sk);
3087 if (optlen < sizeof(int))
3089 if (get_user(val, (int __user *)optval))
3100 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3101 * This option will get or set the maximum size to put in any outgoing
3102 * SCTP DATA chunk. If a message is larger than this size it will be
3103 * fragmented by SCTP into the specified size. Note that the underlying
3104 * SCTP implementation may fragment into smaller sized chunks when the
3105 * PMTU of the underlying association is smaller than the value set by
3106 * the user. The default value for this option is '0' which indicates
3107 * the user is NOT limiting fragmentation and only the PMTU will effect
3108 * SCTP's choice of DATA chunk size. Note also that values set larger
3109 * than the maximum size of an IP datagram will effectively let SCTP
3110 * control fragmentation (i.e. the same as setting this option to 0).
3112 * The following structure is used to access and modify this parameter:
3114 * struct sctp_assoc_value {
3115 * sctp_assoc_t assoc_id;
3116 * uint32_t assoc_value;
3119 * assoc_id: This parameter is ignored for one-to-one style sockets.
3120 * For one-to-many style sockets this parameter indicates which
3121 * association the user is performing an action upon. Note that if
3122 * this field's value is zero then the endpoints default value is
3123 * changed (effecting future associations only).
3124 * assoc_value: This parameter specifies the maximum size in bytes.
3126 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3128 struct sctp_assoc_value params;
3129 struct sctp_association *asoc;
3130 struct sctp_sock *sp = sctp_sk(sk);
3133 if (optlen == sizeof(int)) {
3134 pr_warn_ratelimited(DEPRECATED
3136 "Use of int in maxseg socket option.\n"
3137 "Use struct sctp_assoc_value instead\n",
3138 current->comm, task_pid_nr(current));
3139 if (copy_from_user(&val, optval, optlen))
3141 params.assoc_id = 0;
3142 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3143 if (copy_from_user(¶ms, optval, optlen))
3145 val = params.assoc_value;
3149 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3152 asoc = sctp_id2assoc(sk, params.assoc_id);
3153 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3158 val = asoc->pathmtu;
3159 val -= sp->pf->af->net_header_len;
3160 val -= sizeof(struct sctphdr) +
3161 sizeof(struct sctp_data_chunk);
3163 asoc->user_frag = val;
3164 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3166 sp->user_frag = val;
3174 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3176 * Requests that the peer mark the enclosed address as the association
3177 * primary. The enclosed address must be one of the association's
3178 * locally bound addresses. The following structure is used to make a
3179 * set primary request:
3181 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3182 unsigned int optlen)
3184 struct net *net = sock_net(sk);
3185 struct sctp_sock *sp;
3186 struct sctp_association *asoc = NULL;
3187 struct sctp_setpeerprim prim;
3188 struct sctp_chunk *chunk;
3194 if (!net->sctp.addip_enable)
3197 if (optlen != sizeof(struct sctp_setpeerprim))
3200 if (copy_from_user(&prim, optval, optlen))
3203 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3207 if (!asoc->peer.asconf_capable)
3210 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3213 if (!sctp_state(asoc, ESTABLISHED))
3216 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3220 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3221 return -EADDRNOTAVAIL;
3223 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3224 return -EADDRNOTAVAIL;
3226 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3227 chunk = sctp_make_asconf_set_prim(asoc,
3228 (union sctp_addr *)&prim.sspp_addr);
3232 err = sctp_send_asconf(asoc, chunk);
3234 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3239 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3240 unsigned int optlen)
3242 struct sctp_setadaptation adaptation;
3244 if (optlen != sizeof(struct sctp_setadaptation))
3246 if (copy_from_user(&adaptation, optval, optlen))
3249 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3255 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3257 * The context field in the sctp_sndrcvinfo structure is normally only
3258 * used when a failed message is retrieved holding the value that was
3259 * sent down on the actual send call. This option allows the setting of
3260 * a default context on an association basis that will be received on
3261 * reading messages from the peer. This is especially helpful in the
3262 * one-2-many model for an application to keep some reference to an
3263 * internal state machine that is processing messages on the
3264 * association. Note that the setting of this value only effects
3265 * received messages from the peer and does not effect the value that is
3266 * saved with outbound messages.
3268 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3269 unsigned int optlen)
3271 struct sctp_assoc_value params;
3272 struct sctp_sock *sp;
3273 struct sctp_association *asoc;
3275 if (optlen != sizeof(struct sctp_assoc_value))
3277 if (copy_from_user(¶ms, optval, optlen))
3282 if (params.assoc_id != 0) {
3283 asoc = sctp_id2assoc(sk, params.assoc_id);
3286 asoc->default_rcv_context = params.assoc_value;
3288 sp->default_rcv_context = params.assoc_value;
3295 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3297 * This options will at a minimum specify if the implementation is doing
3298 * fragmented interleave. Fragmented interleave, for a one to many
3299 * socket, is when subsequent calls to receive a message may return
3300 * parts of messages from different associations. Some implementations
3301 * may allow you to turn this value on or off. If so, when turned off,
3302 * no fragment interleave will occur (which will cause a head of line
3303 * blocking amongst multiple associations sharing the same one to many
3304 * socket). When this option is turned on, then each receive call may
3305 * come from a different association (thus the user must receive data
3306 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3307 * association each receive belongs to.
3309 * This option takes a boolean value. A non-zero value indicates that
3310 * fragmented interleave is on. A value of zero indicates that
3311 * fragmented interleave is off.
3313 * Note that it is important that an implementation that allows this
3314 * option to be turned on, have it off by default. Otherwise an unaware
3315 * application using the one to many model may become confused and act
3318 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3319 char __user *optval,
3320 unsigned int optlen)
3324 if (optlen != sizeof(int))
3326 if (get_user(val, (int __user *)optval))
3329 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3335 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3336 * (SCTP_PARTIAL_DELIVERY_POINT)
3338 * This option will set or get the SCTP partial delivery point. This
3339 * point is the size of a message where the partial delivery API will be
3340 * invoked to help free up rwnd space for the peer. Setting this to a
3341 * lower value will cause partial deliveries to happen more often. The
3342 * calls argument is an integer that sets or gets the partial delivery
3343 * point. Note also that the call will fail if the user attempts to set
3344 * this value larger than the socket receive buffer size.
3346 * Note that any single message having a length smaller than or equal to
3347 * the SCTP partial delivery point will be delivered in one single read
3348 * call as long as the user provided buffer is large enough to hold the
3351 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3352 char __user *optval,
3353 unsigned int optlen)
3357 if (optlen != sizeof(u32))
3359 if (get_user(val, (int __user *)optval))
3362 /* Note: We double the receive buffer from what the user sets
3363 * it to be, also initial rwnd is based on rcvbuf/2.
3365 if (val > (sk->sk_rcvbuf >> 1))
3368 sctp_sk(sk)->pd_point = val;
3370 return 0; /* is this the right error code? */
3374 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3376 * This option will allow a user to change the maximum burst of packets
3377 * that can be emitted by this association. Note that the default value
3378 * is 4, and some implementations may restrict this setting so that it
3379 * can only be lowered.
3381 * NOTE: This text doesn't seem right. Do this on a socket basis with
3382 * future associations inheriting the socket value.
3384 static int sctp_setsockopt_maxburst(struct sock *sk,
3385 char __user *optval,
3386 unsigned int optlen)
3388 struct sctp_assoc_value params;
3389 struct sctp_sock *sp;
3390 struct sctp_association *asoc;
3394 if (optlen == sizeof(int)) {
3395 pr_warn_ratelimited(DEPRECATED
3397 "Use of int in max_burst socket option deprecated.\n"
3398 "Use struct sctp_assoc_value instead\n",
3399 current->comm, task_pid_nr(current));
3400 if (copy_from_user(&val, optval, optlen))
3402 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3403 if (copy_from_user(¶ms, optval, optlen))
3405 val = params.assoc_value;
3406 assoc_id = params.assoc_id;
3412 if (assoc_id != 0) {
3413 asoc = sctp_id2assoc(sk, assoc_id);
3416 asoc->max_burst = val;
3418 sp->max_burst = val;
3424 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3426 * This set option adds a chunk type that the user is requesting to be
3427 * received only in an authenticated way. Changes to the list of chunks
3428 * will only effect future associations on the socket.
3430 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3431 char __user *optval,
3432 unsigned int optlen)
3434 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3435 struct sctp_authchunk val;
3437 if (!ep->auth_enable)
3440 if (optlen != sizeof(struct sctp_authchunk))
3442 if (copy_from_user(&val, optval, optlen))
3445 switch (val.sauth_chunk) {
3447 case SCTP_CID_INIT_ACK:
3448 case SCTP_CID_SHUTDOWN_COMPLETE:
3453 /* add this chunk id to the endpoint */
3454 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3458 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3460 * This option gets or sets the list of HMAC algorithms that the local
3461 * endpoint requires the peer to use.
3463 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3464 char __user *optval,
3465 unsigned int optlen)
3467 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3468 struct sctp_hmacalgo *hmacs;
3472 if (!ep->auth_enable)
3475 if (optlen < sizeof(struct sctp_hmacalgo))
3478 hmacs = memdup_user(optval, optlen);
3480 return PTR_ERR(hmacs);
3482 idents = hmacs->shmac_num_idents;
3483 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3484 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3489 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3496 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3498 * This option will set a shared secret key which is used to build an
3499 * association shared key.
3501 static int sctp_setsockopt_auth_key(struct sock *sk,
3502 char __user *optval,
3503 unsigned int optlen)
3505 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3506 struct sctp_authkey *authkey;
3507 struct sctp_association *asoc;
3510 if (!ep->auth_enable)
3513 if (optlen <= sizeof(struct sctp_authkey))
3516 authkey = memdup_user(optval, optlen);
3517 if (IS_ERR(authkey))
3518 return PTR_ERR(authkey);
3520 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3525 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3526 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3531 ret = sctp_auth_set_key(ep, asoc, authkey);
3538 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3540 * This option will get or set the active shared key to be used to build
3541 * the association shared key.
3543 static int sctp_setsockopt_active_key(struct sock *sk,
3544 char __user *optval,
3545 unsigned int optlen)
3547 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3548 struct sctp_authkeyid val;
3549 struct sctp_association *asoc;
3551 if (!ep->auth_enable)
3554 if (optlen != sizeof(struct sctp_authkeyid))
3556 if (copy_from_user(&val, optval, optlen))
3559 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3560 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3563 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3567 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3569 * This set option will delete a shared secret key from use.
3571 static int sctp_setsockopt_del_key(struct sock *sk,
3572 char __user *optval,
3573 unsigned int optlen)
3575 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3576 struct sctp_authkeyid val;
3577 struct sctp_association *asoc;
3579 if (!ep->auth_enable)
3582 if (optlen != sizeof(struct sctp_authkeyid))
3584 if (copy_from_user(&val, optval, optlen))
3587 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3588 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3591 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3596 * 8.1.23 SCTP_AUTO_ASCONF
3598 * This option will enable or disable the use of the automatic generation of
3599 * ASCONF chunks to add and delete addresses to an existing association. Note
3600 * that this option has two caveats namely: a) it only affects sockets that
3601 * are bound to all addresses available to the SCTP stack, and b) the system
3602 * administrator may have an overriding control that turns the ASCONF feature
3603 * off no matter what setting the socket option may have.
3604 * This option expects an integer boolean flag, where a non-zero value turns on
3605 * the option, and a zero value turns off the option.
3606 * Note. In this implementation, socket operation overrides default parameter
3607 * being set by sysctl as well as FreeBSD implementation
3609 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3610 unsigned int optlen)
3613 struct sctp_sock *sp = sctp_sk(sk);
3615 if (optlen < sizeof(int))
3617 if (get_user(val, (int __user *)optval))
3619 if (!sctp_is_ep_boundall(sk) && val)
3621 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3624 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3625 if (val == 0 && sp->do_auto_asconf) {
3626 list_del(&sp->auto_asconf_list);
3627 sp->do_auto_asconf = 0;
3628 } else if (val && !sp->do_auto_asconf) {
3629 list_add_tail(&sp->auto_asconf_list,
3630 &sock_net(sk)->sctp.auto_asconf_splist);
3631 sp->do_auto_asconf = 1;
3633 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3638 * SCTP_PEER_ADDR_THLDS
3640 * This option allows us to alter the partially failed threshold for one or all
3641 * transports in an association. See Section 6.1 of:
3642 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3644 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3645 char __user *optval,
3646 unsigned int optlen)
3648 struct sctp_paddrthlds val;
3649 struct sctp_transport *trans;
3650 struct sctp_association *asoc;
3652 if (optlen < sizeof(struct sctp_paddrthlds))
3654 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3655 sizeof(struct sctp_paddrthlds)))
3659 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3660 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3663 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3665 if (val.spt_pathmaxrxt)
3666 trans->pathmaxrxt = val.spt_pathmaxrxt;
3667 trans->pf_retrans = val.spt_pathpfthld;
3670 if (val.spt_pathmaxrxt)
3671 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3672 asoc->pf_retrans = val.spt_pathpfthld;
3674 trans = sctp_addr_id2transport(sk, &val.spt_address,
3679 if (val.spt_pathmaxrxt)
3680 trans->pathmaxrxt = val.spt_pathmaxrxt;
3681 trans->pf_retrans = val.spt_pathpfthld;
3687 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3688 char __user *optval,
3689 unsigned int optlen)
3693 if (optlen < sizeof(int))
3695 if (get_user(val, (int __user *) optval))
3698 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3703 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3704 char __user *optval,
3705 unsigned int optlen)
3709 if (optlen < sizeof(int))
3711 if (get_user(val, (int __user *) optval))
3714 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3719 static int sctp_setsockopt_pr_supported(struct sock *sk,
3720 char __user *optval,
3721 unsigned int optlen)
3723 struct sctp_assoc_value params;
3724 struct sctp_association *asoc;
3725 int retval = -EINVAL;
3727 if (optlen != sizeof(params))
3730 if (copy_from_user(¶ms, optval, optlen)) {
3735 asoc = sctp_id2assoc(sk, params.assoc_id);
3737 asoc->prsctp_enable = !!params.assoc_value;
3738 } else if (!params.assoc_id) {
3739 struct sctp_sock *sp = sctp_sk(sk);
3741 sp->ep->prsctp_enable = !!params.assoc_value;
3752 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3753 char __user *optval,
3754 unsigned int optlen)
3756 struct sctp_default_prinfo info;
3757 struct sctp_association *asoc;
3758 int retval = -EINVAL;
3760 if (optlen != sizeof(info))
3763 if (copy_from_user(&info, optval, sizeof(info))) {
3768 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3771 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3774 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3776 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3777 asoc->default_timetolive = info.pr_value;
3778 } else if (!info.pr_assoc_id) {
3779 struct sctp_sock *sp = sctp_sk(sk);
3781 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3782 sp->default_timetolive = info.pr_value;
3793 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3794 char __user *optval,
3795 unsigned int optlen)
3797 struct sctp_assoc_value params;
3798 struct sctp_association *asoc;
3799 int retval = -EINVAL;
3801 if (optlen != sizeof(params))
3804 if (copy_from_user(¶ms, optval, optlen)) {
3809 asoc = sctp_id2assoc(sk, params.assoc_id);
3811 asoc->reconf_enable = !!params.assoc_value;
3812 } else if (!params.assoc_id) {
3813 struct sctp_sock *sp = sctp_sk(sk);
3815 sp->ep->reconf_enable = !!params.assoc_value;
3826 static int sctp_setsockopt_enable_strreset(struct sock *sk,
3827 char __user *optval,
3828 unsigned int optlen)
3830 struct sctp_assoc_value params;
3831 struct sctp_association *asoc;
3832 int retval = -EINVAL;
3834 if (optlen != sizeof(params))
3837 if (copy_from_user(¶ms, optval, optlen)) {
3842 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3845 asoc = sctp_id2assoc(sk, params.assoc_id);
3847 asoc->strreset_enable = params.assoc_value;
3848 } else if (!params.assoc_id) {
3849 struct sctp_sock *sp = sctp_sk(sk);
3851 sp->ep->strreset_enable = params.assoc_value;
3862 static int sctp_setsockopt_reset_streams(struct sock *sk,
3863 char __user *optval,
3864 unsigned int optlen)
3866 struct sctp_reset_streams *params;
3867 struct sctp_association *asoc;
3868 int retval = -EINVAL;
3870 if (optlen < sizeof(struct sctp_reset_streams))
3873 params = memdup_user(optval, optlen);
3875 return PTR_ERR(params);
3877 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
3881 retval = sctp_send_reset_streams(asoc, params);
3888 static int sctp_setsockopt_reset_assoc(struct sock *sk,
3889 char __user *optval,
3890 unsigned int optlen)
3892 struct sctp_association *asoc;
3893 sctp_assoc_t associd;
3894 int retval = -EINVAL;
3896 if (optlen != sizeof(associd))
3899 if (copy_from_user(&associd, optval, optlen)) {
3904 asoc = sctp_id2assoc(sk, associd);
3908 retval = sctp_send_reset_assoc(asoc);
3914 static int sctp_setsockopt_add_streams(struct sock *sk,
3915 char __user *optval,
3916 unsigned int optlen)
3918 struct sctp_association *asoc;
3919 struct sctp_add_streams params;
3920 int retval = -EINVAL;
3922 if (optlen != sizeof(params))
3925 if (copy_from_user(¶ms, optval, optlen)) {
3930 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
3934 retval = sctp_send_add_streams(asoc, ¶ms);
3940 /* API 6.2 setsockopt(), getsockopt()
3942 * Applications use setsockopt() and getsockopt() to set or retrieve
3943 * socket options. Socket options are used to change the default
3944 * behavior of sockets calls. They are described in Section 7.
3948 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3949 * int __user *optlen);
3950 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3953 * sd - the socket descript.
3954 * level - set to IPPROTO_SCTP for all SCTP options.
3955 * optname - the option name.
3956 * optval - the buffer to store the value of the option.
3957 * optlen - the size of the buffer.
3959 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3960 char __user *optval, unsigned int optlen)
3964 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3966 /* I can hardly begin to describe how wrong this is. This is
3967 * so broken as to be worse than useless. The API draft
3968 * REALLY is NOT helpful here... I am not convinced that the
3969 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3970 * are at all well-founded.
3972 if (level != SOL_SCTP) {
3973 struct sctp_af *af = sctp_sk(sk)->pf->af;
3974 retval = af->setsockopt(sk, level, optname, optval, optlen);
3981 case SCTP_SOCKOPT_BINDX_ADD:
3982 /* 'optlen' is the size of the addresses buffer. */
3983 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3984 optlen, SCTP_BINDX_ADD_ADDR);
3987 case SCTP_SOCKOPT_BINDX_REM:
3988 /* 'optlen' is the size of the addresses buffer. */
3989 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3990 optlen, SCTP_BINDX_REM_ADDR);
3993 case SCTP_SOCKOPT_CONNECTX_OLD:
3994 /* 'optlen' is the size of the addresses buffer. */
3995 retval = sctp_setsockopt_connectx_old(sk,
3996 (struct sockaddr __user *)optval,
4000 case SCTP_SOCKOPT_CONNECTX:
4001 /* 'optlen' is the size of the addresses buffer. */
4002 retval = sctp_setsockopt_connectx(sk,
4003 (struct sockaddr __user *)optval,
4007 case SCTP_DISABLE_FRAGMENTS:
4008 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4012 retval = sctp_setsockopt_events(sk, optval, optlen);
4015 case SCTP_AUTOCLOSE:
4016 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4019 case SCTP_PEER_ADDR_PARAMS:
4020 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4023 case SCTP_DELAYED_SACK:
4024 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4026 case SCTP_PARTIAL_DELIVERY_POINT:
4027 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4031 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4033 case SCTP_DEFAULT_SEND_PARAM:
4034 retval = sctp_setsockopt_default_send_param(sk, optval,
4037 case SCTP_DEFAULT_SNDINFO:
4038 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4040 case SCTP_PRIMARY_ADDR:
4041 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4043 case SCTP_SET_PEER_PRIMARY_ADDR:
4044 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4047 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4050 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4052 case SCTP_ASSOCINFO:
4053 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4055 case SCTP_I_WANT_MAPPED_V4_ADDR:
4056 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4059 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4061 case SCTP_ADAPTATION_LAYER:
4062 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4065 retval = sctp_setsockopt_context(sk, optval, optlen);
4067 case SCTP_FRAGMENT_INTERLEAVE:
4068 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4070 case SCTP_MAX_BURST:
4071 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4073 case SCTP_AUTH_CHUNK:
4074 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4076 case SCTP_HMAC_IDENT:
4077 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4080 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4082 case SCTP_AUTH_ACTIVE_KEY:
4083 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4085 case SCTP_AUTH_DELETE_KEY:
4086 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4088 case SCTP_AUTO_ASCONF:
4089 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4091 case SCTP_PEER_ADDR_THLDS:
4092 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4094 case SCTP_RECVRCVINFO:
4095 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4097 case SCTP_RECVNXTINFO:
4098 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4100 case SCTP_PR_SUPPORTED:
4101 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4103 case SCTP_DEFAULT_PRINFO:
4104 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4106 case SCTP_RECONFIG_SUPPORTED:
4107 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4109 case SCTP_ENABLE_STREAM_RESET:
4110 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4112 case SCTP_RESET_STREAMS:
4113 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4115 case SCTP_RESET_ASSOC:
4116 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4118 case SCTP_ADD_STREAMS:
4119 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4122 retval = -ENOPROTOOPT;
4132 /* API 3.1.6 connect() - UDP Style Syntax
4134 * An application may use the connect() call in the UDP model to initiate an
4135 * association without sending data.
4139 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4141 * sd: the socket descriptor to have a new association added to.
4143 * nam: the address structure (either struct sockaddr_in or struct
4144 * sockaddr_in6 defined in RFC2553 [7]).
4146 * len: the size of the address.
4148 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4156 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4159 /* Validate addr_len before calling common connect/connectx routine. */
4160 af = sctp_get_af_specific(addr->sa_family);
4161 if (!af || addr_len < af->sockaddr_len) {
4164 /* Pass correct addr len to common routine (so it knows there
4165 * is only one address being passed.
4167 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
4174 /* FIXME: Write comments. */
4175 static int sctp_disconnect(struct sock *sk, int flags)
4177 return -EOPNOTSUPP; /* STUB */
4180 /* 4.1.4 accept() - TCP Style Syntax
4182 * Applications use accept() call to remove an established SCTP
4183 * association from the accept queue of the endpoint. A new socket
4184 * descriptor will be returned from accept() to represent the newly
4185 * formed association.
4187 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4189 struct sctp_sock *sp;
4190 struct sctp_endpoint *ep;
4191 struct sock *newsk = NULL;
4192 struct sctp_association *asoc;
4201 if (!sctp_style(sk, TCP)) {
4202 error = -EOPNOTSUPP;
4206 if (!sctp_sstate(sk, LISTENING)) {
4211 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4213 error = sctp_wait_for_accept(sk, timeo);
4217 /* We treat the list of associations on the endpoint as the accept
4218 * queue and pick the first association on the list.
4220 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4222 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4228 /* Populate the fields of the newsk from the oldsk and migrate the
4229 * asoc to the newsk.
4231 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4239 /* The SCTP ioctl handler. */
4240 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4247 * SEQPACKET-style sockets in LISTENING state are valid, for
4248 * SCTP, so only discard TCP-style sockets in LISTENING state.
4250 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4255 struct sk_buff *skb;
4256 unsigned int amount = 0;
4258 skb = skb_peek(&sk->sk_receive_queue);
4261 * We will only return the amount of this packet since
4262 * that is all that will be read.
4266 rc = put_user(amount, (int __user *)arg);
4278 /* This is the function which gets called during socket creation to
4279 * initialized the SCTP-specific portion of the sock.
4280 * The sock structure should already be zero-filled memory.
4282 static int sctp_init_sock(struct sock *sk)
4284 struct net *net = sock_net(sk);
4285 struct sctp_sock *sp;
4287 pr_debug("%s: sk:%p\n", __func__, sk);
4291 /* Initialize the SCTP per socket area. */
4292 switch (sk->sk_type) {
4293 case SOCK_SEQPACKET:
4294 sp->type = SCTP_SOCKET_UDP;
4297 sp->type = SCTP_SOCKET_TCP;
4300 return -ESOCKTNOSUPPORT;
4303 sk->sk_gso_type = SKB_GSO_SCTP;
4305 /* Initialize default send parameters. These parameters can be
4306 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4308 sp->default_stream = 0;
4309 sp->default_ppid = 0;
4310 sp->default_flags = 0;
4311 sp->default_context = 0;
4312 sp->default_timetolive = 0;
4314 sp->default_rcv_context = 0;
4315 sp->max_burst = net->sctp.max_burst;
4317 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4319 /* Initialize default setup parameters. These parameters
4320 * can be modified with the SCTP_INITMSG socket option or
4321 * overridden by the SCTP_INIT CMSG.
4323 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4324 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4325 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4326 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4328 /* Initialize default RTO related parameters. These parameters can
4329 * be modified for with the SCTP_RTOINFO socket option.
4331 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4332 sp->rtoinfo.srto_max = net->sctp.rto_max;
4333 sp->rtoinfo.srto_min = net->sctp.rto_min;
4335 /* Initialize default association related parameters. These parameters
4336 * can be modified with the SCTP_ASSOCINFO socket option.
4338 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4339 sp->assocparams.sasoc_number_peer_destinations = 0;
4340 sp->assocparams.sasoc_peer_rwnd = 0;
4341 sp->assocparams.sasoc_local_rwnd = 0;
4342 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4344 /* Initialize default event subscriptions. By default, all the
4347 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4349 /* Default Peer Address Parameters. These defaults can
4350 * be modified via SCTP_PEER_ADDR_PARAMS
4352 sp->hbinterval = net->sctp.hb_interval;
4353 sp->pathmaxrxt = net->sctp.max_retrans_path;
4354 sp->pathmtu = 0; /* allow default discovery */
4355 sp->sackdelay = net->sctp.sack_timeout;
4357 sp->param_flags = SPP_HB_ENABLE |
4359 SPP_SACKDELAY_ENABLE;
4361 /* If enabled no SCTP message fragmentation will be performed.
4362 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4364 sp->disable_fragments = 0;
4366 /* Enable Nagle algorithm by default. */
4369 sp->recvrcvinfo = 0;
4370 sp->recvnxtinfo = 0;
4372 /* Enable by default. */
4375 /* Auto-close idle associations after the configured
4376 * number of seconds. A value of 0 disables this
4377 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4378 * for UDP-style sockets only.
4382 /* User specified fragmentation limit. */
4385 sp->adaptation_ind = 0;
4387 sp->pf = sctp_get_pf_specific(sk->sk_family);
4389 /* Control variables for partial data delivery. */
4390 atomic_set(&sp->pd_mode, 0);
4391 skb_queue_head_init(&sp->pd_lobby);
4392 sp->frag_interleave = 0;
4394 /* Create a per socket endpoint structure. Even if we
4395 * change the data structure relationships, this may still
4396 * be useful for storing pre-connect address information.
4398 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4404 sk->sk_destruct = sctp_destruct_sock;
4406 SCTP_DBG_OBJCNT_INC(sock);
4409 percpu_counter_inc(&sctp_sockets_allocated);
4410 sock_prot_inuse_add(net, sk->sk_prot, 1);
4412 /* Nothing can fail after this block, otherwise
4413 * sctp_destroy_sock() will be called without addr_wq_lock held
4415 if (net->sctp.default_auto_asconf) {
4416 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4417 list_add_tail(&sp->auto_asconf_list,
4418 &net->sctp.auto_asconf_splist);
4419 sp->do_auto_asconf = 1;
4420 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4422 sp->do_auto_asconf = 0;
4430 /* Cleanup any SCTP per socket resources. Must be called with
4431 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4433 static void sctp_destroy_sock(struct sock *sk)
4435 struct sctp_sock *sp;
4437 pr_debug("%s: sk:%p\n", __func__, sk);
4439 /* Release our hold on the endpoint. */
4441 /* This could happen during socket init, thus we bail out
4442 * early, since the rest of the below is not setup either.
4447 if (sp->do_auto_asconf) {
4448 sp->do_auto_asconf = 0;
4449 list_del(&sp->auto_asconf_list);
4451 sctp_endpoint_free(sp->ep);
4453 percpu_counter_dec(&sctp_sockets_allocated);
4454 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4458 /* Triggered when there are no references on the socket anymore */
4459 static void sctp_destruct_sock(struct sock *sk)
4461 struct sctp_sock *sp = sctp_sk(sk);
4463 /* Free up the HMAC transform. */
4464 crypto_free_shash(sp->hmac);
4466 inet_sock_destruct(sk);
4469 /* API 4.1.7 shutdown() - TCP Style Syntax
4470 * int shutdown(int socket, int how);
4472 * sd - the socket descriptor of the association to be closed.
4473 * how - Specifies the type of shutdown. The values are
4476 * Disables further receive operations. No SCTP
4477 * protocol action is taken.
4479 * Disables further send operations, and initiates
4480 * the SCTP shutdown sequence.
4482 * Disables further send and receive operations
4483 * and initiates the SCTP shutdown sequence.
4485 static void sctp_shutdown(struct sock *sk, int how)
4487 struct net *net = sock_net(sk);
4488 struct sctp_endpoint *ep;
4490 if (!sctp_style(sk, TCP))
4493 ep = sctp_sk(sk)->ep;
4494 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4495 struct sctp_association *asoc;
4497 sk->sk_state = SCTP_SS_CLOSING;
4498 asoc = list_entry(ep->asocs.next,
4499 struct sctp_association, asocs);
4500 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4504 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4505 struct sctp_info *info)
4507 struct sctp_transport *prim;
4508 struct list_head *pos;
4511 memset(info, 0, sizeof(*info));
4513 struct sctp_sock *sp = sctp_sk(sk);
4515 info->sctpi_s_autoclose = sp->autoclose;
4516 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4517 info->sctpi_s_pd_point = sp->pd_point;
4518 info->sctpi_s_nodelay = sp->nodelay;
4519 info->sctpi_s_disable_fragments = sp->disable_fragments;
4520 info->sctpi_s_v4mapped = sp->v4mapped;
4521 info->sctpi_s_frag_interleave = sp->frag_interleave;
4522 info->sctpi_s_type = sp->type;
4527 info->sctpi_tag = asoc->c.my_vtag;
4528 info->sctpi_state = asoc->state;
4529 info->sctpi_rwnd = asoc->a_rwnd;
4530 info->sctpi_unackdata = asoc->unack_data;
4531 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4532 info->sctpi_instrms = asoc->stream.incnt;
4533 info->sctpi_outstrms = asoc->stream.outcnt;
4534 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4535 info->sctpi_inqueue++;
4536 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4537 info->sctpi_outqueue++;
4538 info->sctpi_overall_error = asoc->overall_error_count;
4539 info->sctpi_max_burst = asoc->max_burst;
4540 info->sctpi_maxseg = asoc->frag_point;
4541 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4542 info->sctpi_peer_tag = asoc->c.peer_vtag;
4544 mask = asoc->peer.ecn_capable << 1;
4545 mask = (mask | asoc->peer.ipv4_address) << 1;
4546 mask = (mask | asoc->peer.ipv6_address) << 1;
4547 mask = (mask | asoc->peer.hostname_address) << 1;
4548 mask = (mask | asoc->peer.asconf_capable) << 1;
4549 mask = (mask | asoc->peer.prsctp_capable) << 1;
4550 mask = (mask | asoc->peer.auth_capable);
4551 info->sctpi_peer_capable = mask;
4552 mask = asoc->peer.sack_needed << 1;
4553 mask = (mask | asoc->peer.sack_generation) << 1;
4554 mask = (mask | asoc->peer.zero_window_announced);
4555 info->sctpi_peer_sack = mask;
4557 info->sctpi_isacks = asoc->stats.isacks;
4558 info->sctpi_osacks = asoc->stats.osacks;
4559 info->sctpi_opackets = asoc->stats.opackets;
4560 info->sctpi_ipackets = asoc->stats.ipackets;
4561 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4562 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4563 info->sctpi_idupchunks = asoc->stats.idupchunks;
4564 info->sctpi_gapcnt = asoc->stats.gapcnt;
4565 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4566 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4567 info->sctpi_oodchunks = asoc->stats.oodchunks;
4568 info->sctpi_iodchunks = asoc->stats.iodchunks;
4569 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4570 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4572 prim = asoc->peer.primary_path;
4573 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4574 info->sctpi_p_state = prim->state;
4575 info->sctpi_p_cwnd = prim->cwnd;
4576 info->sctpi_p_srtt = prim->srtt;
4577 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4578 info->sctpi_p_hbinterval = prim->hbinterval;
4579 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4580 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4581 info->sctpi_p_ssthresh = prim->ssthresh;
4582 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4583 info->sctpi_p_flight_size = prim->flight_size;
4584 info->sctpi_p_error = prim->error_count;
4588 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4590 /* use callback to avoid exporting the core structure */
4591 int sctp_transport_walk_start(struct rhashtable_iter *iter)
4595 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4597 err = rhashtable_walk_start(iter);
4598 if (err && err != -EAGAIN) {
4599 rhashtable_walk_stop(iter);
4600 rhashtable_walk_exit(iter);
4607 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4609 rhashtable_walk_stop(iter);
4610 rhashtable_walk_exit(iter);
4613 struct sctp_transport *sctp_transport_get_next(struct net *net,
4614 struct rhashtable_iter *iter)
4616 struct sctp_transport *t;
4618 t = rhashtable_walk_next(iter);
4619 for (; t; t = rhashtable_walk_next(iter)) {
4621 if (PTR_ERR(t) == -EAGAIN)
4626 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4627 t->asoc->peer.primary_path == t)
4634 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4635 struct rhashtable_iter *iter,
4638 void *obj = SEQ_START_TOKEN;
4640 while (pos && (obj = sctp_transport_get_next(net, iter)) &&
4647 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4651 struct sctp_ep_common *epb;
4652 struct sctp_hashbucket *head;
4654 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4656 read_lock_bh(&head->lock);
4657 sctp_for_each_hentry(epb, &head->chain) {
4658 err = cb(sctp_ep(epb), p);
4662 read_unlock_bh(&head->lock);
4667 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4669 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4671 const union sctp_addr *laddr,
4672 const union sctp_addr *paddr, void *p)
4674 struct sctp_transport *transport;
4678 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4683 err = cb(transport, p);
4684 sctp_transport_put(transport);
4688 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4690 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4691 int (*cb_done)(struct sctp_transport *, void *),
4692 struct net *net, int *pos, void *p) {
4693 struct rhashtable_iter hti;
4694 struct sctp_transport *tsp;
4698 ret = sctp_transport_walk_start(&hti);
4702 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
4703 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
4704 if (!sctp_transport_hold(tsp))
4710 sctp_transport_put(tsp);
4712 sctp_transport_walk_stop(&hti);
4715 if (cb_done && !cb_done(tsp, p)) {
4717 sctp_transport_put(tsp);
4720 sctp_transport_put(tsp);
4725 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
4727 /* 7.2.1 Association Status (SCTP_STATUS)
4729 * Applications can retrieve current status information about an
4730 * association, including association state, peer receiver window size,
4731 * number of unacked data chunks, and number of data chunks pending
4732 * receipt. This information is read-only.
4734 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4735 char __user *optval,
4738 struct sctp_status status;
4739 struct sctp_association *asoc = NULL;
4740 struct sctp_transport *transport;
4741 sctp_assoc_t associd;
4744 if (len < sizeof(status)) {
4749 len = sizeof(status);
4750 if (copy_from_user(&status, optval, len)) {
4755 associd = status.sstat_assoc_id;
4756 asoc = sctp_id2assoc(sk, associd);
4762 transport = asoc->peer.primary_path;
4764 status.sstat_assoc_id = sctp_assoc2id(asoc);
4765 status.sstat_state = sctp_assoc_to_state(asoc);
4766 status.sstat_rwnd = asoc->peer.rwnd;
4767 status.sstat_unackdata = asoc->unack_data;
4769 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4770 status.sstat_instrms = asoc->stream.incnt;
4771 status.sstat_outstrms = asoc->stream.outcnt;
4772 status.sstat_fragmentation_point = asoc->frag_point;
4773 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4774 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4775 transport->af_specific->sockaddr_len);
4776 /* Map ipv4 address into v4-mapped-on-v6 address. */
4777 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4778 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4779 status.sstat_primary.spinfo_state = transport->state;
4780 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4781 status.sstat_primary.spinfo_srtt = transport->srtt;
4782 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4783 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4785 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4786 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4788 if (put_user(len, optlen)) {
4793 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4794 __func__, len, status.sstat_state, status.sstat_rwnd,
4795 status.sstat_assoc_id);
4797 if (copy_to_user(optval, &status, len)) {
4807 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4809 * Applications can retrieve information about a specific peer address
4810 * of an association, including its reachability state, congestion
4811 * window, and retransmission timer values. This information is
4814 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4815 char __user *optval,
4818 struct sctp_paddrinfo pinfo;
4819 struct sctp_transport *transport;
4822 if (len < sizeof(pinfo)) {
4827 len = sizeof(pinfo);
4828 if (copy_from_user(&pinfo, optval, len)) {
4833 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4834 pinfo.spinfo_assoc_id);
4838 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4839 pinfo.spinfo_state = transport->state;
4840 pinfo.spinfo_cwnd = transport->cwnd;
4841 pinfo.spinfo_srtt = transport->srtt;
4842 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4843 pinfo.spinfo_mtu = transport->pathmtu;
4845 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4846 pinfo.spinfo_state = SCTP_ACTIVE;
4848 if (put_user(len, optlen)) {
4853 if (copy_to_user(optval, &pinfo, len)) {
4862 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4864 * This option is a on/off flag. If enabled no SCTP message
4865 * fragmentation will be performed. Instead if a message being sent
4866 * exceeds the current PMTU size, the message will NOT be sent and
4867 * instead a error will be indicated to the user.
4869 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4870 char __user *optval, int __user *optlen)
4874 if (len < sizeof(int))
4878 val = (sctp_sk(sk)->disable_fragments == 1);
4879 if (put_user(len, optlen))
4881 if (copy_to_user(optval, &val, len))
4886 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4888 * This socket option is used to specify various notifications and
4889 * ancillary data the user wishes to receive.
4891 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4896 if (len > sizeof(struct sctp_event_subscribe))
4897 len = sizeof(struct sctp_event_subscribe);
4898 if (put_user(len, optlen))
4900 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4905 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4907 * This socket option is applicable to the UDP-style socket only. When
4908 * set it will cause associations that are idle for more than the
4909 * specified number of seconds to automatically close. An association
4910 * being idle is defined an association that has NOT sent or received
4911 * user data. The special value of '0' indicates that no automatic
4912 * close of any associations should be performed. The option expects an
4913 * integer defining the number of seconds of idle time before an
4914 * association is closed.
4916 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4918 /* Applicable to UDP-style socket only */
4919 if (sctp_style(sk, TCP))
4921 if (len < sizeof(int))
4924 if (put_user(len, optlen))
4926 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4931 /* Helper routine to branch off an association to a new socket. */
4932 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4934 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4935 struct sctp_sock *sp = sctp_sk(sk);
4936 struct socket *sock;
4939 /* Do not peel off from one netns to another one. */
4940 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
4946 /* If there is a thread waiting on more sndbuf space for
4947 * sending on this asoc, it cannot be peeled.
4949 if (waitqueue_active(&asoc->wait))
4952 /* An association cannot be branched off from an already peeled-off
4953 * socket, nor is this supported for tcp style sockets.
4955 if (!sctp_style(sk, UDP))
4958 /* Create a new socket. */
4959 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4963 sctp_copy_sock(sock->sk, sk, asoc);
4965 /* Make peeled-off sockets more like 1-1 accepted sockets.
4966 * Set the daddr and initialize id to something more random
4968 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4970 /* Populate the fields of the newsk from the oldsk and migrate the
4971 * asoc to the newsk.
4973 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4979 EXPORT_SYMBOL(sctp_do_peeloff);
4981 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
4982 struct file **newfile, unsigned flags)
4984 struct socket *newsock;
4987 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
4991 /* Map the socket to an unused fd that can be returned to the user. */
4992 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
4994 sock_release(newsock);
4998 *newfile = sock_alloc_file(newsock, 0, NULL);
4999 if (IS_ERR(*newfile)) {
5000 put_unused_fd(retval);
5001 sock_release(newsock);
5002 retval = PTR_ERR(*newfile);
5007 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5010 peeloff->sd = retval;
5012 if (flags & SOCK_NONBLOCK)
5013 (*newfile)->f_flags |= O_NONBLOCK;
5018 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5020 sctp_peeloff_arg_t peeloff;
5021 struct file *newfile = NULL;
5024 if (len < sizeof(sctp_peeloff_arg_t))
5026 len = sizeof(sctp_peeloff_arg_t);
5027 if (copy_from_user(&peeloff, optval, len))
5030 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5034 /* Return the fd mapped to the new socket. */
5035 if (put_user(len, optlen)) {
5037 put_unused_fd(retval);
5041 if (copy_to_user(optval, &peeloff, len)) {
5043 put_unused_fd(retval);
5046 fd_install(retval, newfile);
5051 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5052 char __user *optval, int __user *optlen)
5054 sctp_peeloff_flags_arg_t peeloff;
5055 struct file *newfile = NULL;
5058 if (len < sizeof(sctp_peeloff_flags_arg_t))
5060 len = sizeof(sctp_peeloff_flags_arg_t);
5061 if (copy_from_user(&peeloff, optval, len))
5064 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5065 &newfile, peeloff.flags);
5069 /* Return the fd mapped to the new socket. */
5070 if (put_user(len, optlen)) {
5072 put_unused_fd(retval);
5076 if (copy_to_user(optval, &peeloff, len)) {
5078 put_unused_fd(retval);
5081 fd_install(retval, newfile);
5086 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5088 * Applications can enable or disable heartbeats for any peer address of
5089 * an association, modify an address's heartbeat interval, force a
5090 * heartbeat to be sent immediately, and adjust the address's maximum
5091 * number of retransmissions sent before an address is considered
5092 * unreachable. The following structure is used to access and modify an
5093 * address's parameters:
5095 * struct sctp_paddrparams {
5096 * sctp_assoc_t spp_assoc_id;
5097 * struct sockaddr_storage spp_address;
5098 * uint32_t spp_hbinterval;
5099 * uint16_t spp_pathmaxrxt;
5100 * uint32_t spp_pathmtu;
5101 * uint32_t spp_sackdelay;
5102 * uint32_t spp_flags;
5105 * spp_assoc_id - (one-to-many style socket) This is filled in the
5106 * application, and identifies the association for
5108 * spp_address - This specifies which address is of interest.
5109 * spp_hbinterval - This contains the value of the heartbeat interval,
5110 * in milliseconds. If a value of zero
5111 * is present in this field then no changes are to
5112 * be made to this parameter.
5113 * spp_pathmaxrxt - This contains the maximum number of
5114 * retransmissions before this address shall be
5115 * considered unreachable. If a value of zero
5116 * is present in this field then no changes are to
5117 * be made to this parameter.
5118 * spp_pathmtu - When Path MTU discovery is disabled the value
5119 * specified here will be the "fixed" path mtu.
5120 * Note that if the spp_address field is empty
5121 * then all associations on this address will
5122 * have this fixed path mtu set upon them.
5124 * spp_sackdelay - When delayed sack is enabled, this value specifies
5125 * the number of milliseconds that sacks will be delayed
5126 * for. This value will apply to all addresses of an
5127 * association if the spp_address field is empty. Note
5128 * also, that if delayed sack is enabled and this
5129 * value is set to 0, no change is made to the last
5130 * recorded delayed sack timer value.
5132 * spp_flags - These flags are used to control various features
5133 * on an association. The flag field may contain
5134 * zero or more of the following options.
5136 * SPP_HB_ENABLE - Enable heartbeats on the
5137 * specified address. Note that if the address
5138 * field is empty all addresses for the association
5139 * have heartbeats enabled upon them.
5141 * SPP_HB_DISABLE - Disable heartbeats on the
5142 * speicifed address. Note that if the address
5143 * field is empty all addresses for the association
5144 * will have their heartbeats disabled. Note also
5145 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5146 * mutually exclusive, only one of these two should
5147 * be specified. Enabling both fields will have
5148 * undetermined results.
5150 * SPP_HB_DEMAND - Request a user initiated heartbeat
5151 * to be made immediately.
5153 * SPP_PMTUD_ENABLE - This field will enable PMTU
5154 * discovery upon the specified address. Note that
5155 * if the address feild is empty then all addresses
5156 * on the association are effected.
5158 * SPP_PMTUD_DISABLE - This field will disable PMTU
5159 * discovery upon the specified address. Note that
5160 * if the address feild is empty then all addresses
5161 * on the association are effected. Not also that
5162 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5163 * exclusive. Enabling both will have undetermined
5166 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5167 * on delayed sack. The time specified in spp_sackdelay
5168 * is used to specify the sack delay for this address. Note
5169 * that if spp_address is empty then all addresses will
5170 * enable delayed sack and take on the sack delay
5171 * value specified in spp_sackdelay.
5172 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5173 * off delayed sack. If the spp_address field is blank then
5174 * delayed sack is disabled for the entire association. Note
5175 * also that this field is mutually exclusive to
5176 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5179 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5180 char __user *optval, int __user *optlen)
5182 struct sctp_paddrparams params;
5183 struct sctp_transport *trans = NULL;
5184 struct sctp_association *asoc = NULL;
5185 struct sctp_sock *sp = sctp_sk(sk);
5187 if (len < sizeof(struct sctp_paddrparams))
5189 len = sizeof(struct sctp_paddrparams);
5190 if (copy_from_user(¶ms, optval, len))
5193 /* If an address other than INADDR_ANY is specified, and
5194 * no transport is found, then the request is invalid.
5196 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5197 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5198 params.spp_assoc_id);
5200 pr_debug("%s: failed no transport\n", __func__);
5205 /* Get association, if assoc_id != 0 and the socket is a one
5206 * to many style socket, and an association was not found, then
5207 * the id was invalid.
5209 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5210 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5211 pr_debug("%s: failed no association\n", __func__);
5216 /* Fetch transport values. */
5217 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5218 params.spp_pathmtu = trans->pathmtu;
5219 params.spp_pathmaxrxt = trans->pathmaxrxt;
5220 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5222 /*draft-11 doesn't say what to return in spp_flags*/
5223 params.spp_flags = trans->param_flags;
5225 /* Fetch association values. */
5226 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5227 params.spp_pathmtu = asoc->pathmtu;
5228 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5229 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5231 /*draft-11 doesn't say what to return in spp_flags*/
5232 params.spp_flags = asoc->param_flags;
5234 /* Fetch socket values. */
5235 params.spp_hbinterval = sp->hbinterval;
5236 params.spp_pathmtu = sp->pathmtu;
5237 params.spp_sackdelay = sp->sackdelay;
5238 params.spp_pathmaxrxt = sp->pathmaxrxt;
5240 /*draft-11 doesn't say what to return in spp_flags*/
5241 params.spp_flags = sp->param_flags;
5244 if (copy_to_user(optval, ¶ms, len))
5247 if (put_user(len, optlen))
5254 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5256 * This option will effect the way delayed acks are performed. This
5257 * option allows you to get or set the delayed ack time, in
5258 * milliseconds. It also allows changing the delayed ack frequency.
5259 * Changing the frequency to 1 disables the delayed sack algorithm. If
5260 * the assoc_id is 0, then this sets or gets the endpoints default
5261 * values. If the assoc_id field is non-zero, then the set or get
5262 * effects the specified association for the one to many model (the
5263 * assoc_id field is ignored by the one to one model). Note that if
5264 * sack_delay or sack_freq are 0 when setting this option, then the
5265 * current values will remain unchanged.
5267 * struct sctp_sack_info {
5268 * sctp_assoc_t sack_assoc_id;
5269 * uint32_t sack_delay;
5270 * uint32_t sack_freq;
5273 * sack_assoc_id - This parameter, indicates which association the user
5274 * is performing an action upon. Note that if this field's value is
5275 * zero then the endpoints default value is changed (effecting future
5276 * associations only).
5278 * sack_delay - This parameter contains the number of milliseconds that
5279 * the user is requesting the delayed ACK timer be set to. Note that
5280 * this value is defined in the standard to be between 200 and 500
5283 * sack_freq - This parameter contains the number of packets that must
5284 * be received before a sack is sent without waiting for the delay
5285 * timer to expire. The default value for this is 2, setting this
5286 * value to 1 will disable the delayed sack algorithm.
5288 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5289 char __user *optval,
5292 struct sctp_sack_info params;
5293 struct sctp_association *asoc = NULL;
5294 struct sctp_sock *sp = sctp_sk(sk);
5296 if (len >= sizeof(struct sctp_sack_info)) {
5297 len = sizeof(struct sctp_sack_info);
5299 if (copy_from_user(¶ms, optval, len))
5301 } else if (len == sizeof(struct sctp_assoc_value)) {
5302 pr_warn_ratelimited(DEPRECATED
5304 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5305 "Use struct sctp_sack_info instead\n",
5306 current->comm, task_pid_nr(current));
5307 if (copy_from_user(¶ms, optval, len))
5312 /* Get association, if sack_assoc_id != 0 and the socket is a one
5313 * to many style socket, and an association was not found, then
5314 * the id was invalid.
5316 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5317 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5321 /* Fetch association values. */
5322 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5323 params.sack_delay = jiffies_to_msecs(
5325 params.sack_freq = asoc->sackfreq;
5328 params.sack_delay = 0;
5329 params.sack_freq = 1;
5332 /* Fetch socket values. */
5333 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5334 params.sack_delay = sp->sackdelay;
5335 params.sack_freq = sp->sackfreq;
5337 params.sack_delay = 0;
5338 params.sack_freq = 1;
5342 if (copy_to_user(optval, ¶ms, len))
5345 if (put_user(len, optlen))
5351 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5353 * Applications can specify protocol parameters for the default association
5354 * initialization. The option name argument to setsockopt() and getsockopt()
5357 * Setting initialization parameters is effective only on an unconnected
5358 * socket (for UDP-style sockets only future associations are effected
5359 * by the change). With TCP-style sockets, this option is inherited by
5360 * sockets derived from a listener socket.
5362 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5364 if (len < sizeof(struct sctp_initmsg))
5366 len = sizeof(struct sctp_initmsg);
5367 if (put_user(len, optlen))
5369 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5375 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5376 char __user *optval, int __user *optlen)
5378 struct sctp_association *asoc;
5380 struct sctp_getaddrs getaddrs;
5381 struct sctp_transport *from;
5383 union sctp_addr temp;
5384 struct sctp_sock *sp = sctp_sk(sk);
5389 if (len < sizeof(struct sctp_getaddrs))
5392 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5395 /* For UDP-style sockets, id specifies the association to query. */
5396 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5400 to = optval + offsetof(struct sctp_getaddrs, addrs);
5401 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5403 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5405 memcpy(&temp, &from->ipaddr, sizeof(temp));
5406 addrlen = sctp_get_pf_specific(sk->sk_family)
5407 ->addr_to_user(sp, &temp);
5408 if (space_left < addrlen)
5410 if (copy_to_user(to, &temp, addrlen))
5414 space_left -= addrlen;
5417 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5419 bytes_copied = ((char __user *)to) - optval;
5420 if (put_user(bytes_copied, optlen))
5426 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5427 size_t space_left, int *bytes_copied)
5429 struct sctp_sockaddr_entry *addr;
5430 union sctp_addr temp;
5433 struct net *net = sock_net(sk);
5436 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5440 if ((PF_INET == sk->sk_family) &&
5441 (AF_INET6 == addr->a.sa.sa_family))
5443 if ((PF_INET6 == sk->sk_family) &&
5444 inet_v6_ipv6only(sk) &&
5445 (AF_INET == addr->a.sa.sa_family))
5447 memcpy(&temp, &addr->a, sizeof(temp));
5448 if (!temp.v4.sin_port)
5449 temp.v4.sin_port = htons(port);
5451 addrlen = sctp_get_pf_specific(sk->sk_family)
5452 ->addr_to_user(sctp_sk(sk), &temp);
5454 if (space_left < addrlen) {
5458 memcpy(to, &temp, addrlen);
5462 space_left -= addrlen;
5463 *bytes_copied += addrlen;
5471 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5472 char __user *optval, int __user *optlen)
5474 struct sctp_bind_addr *bp;
5475 struct sctp_association *asoc;
5477 struct sctp_getaddrs getaddrs;
5478 struct sctp_sockaddr_entry *addr;
5480 union sctp_addr temp;
5481 struct sctp_sock *sp = sctp_sk(sk);
5485 int bytes_copied = 0;
5489 if (len < sizeof(struct sctp_getaddrs))
5492 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5496 * For UDP-style sockets, id specifies the association to query.
5497 * If the id field is set to the value '0' then the locally bound
5498 * addresses are returned without regard to any particular
5501 if (0 == getaddrs.assoc_id) {
5502 bp = &sctp_sk(sk)->ep->base.bind_addr;
5504 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5507 bp = &asoc->base.bind_addr;
5510 to = optval + offsetof(struct sctp_getaddrs, addrs);
5511 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5513 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5517 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5518 * addresses from the global local address list.
5520 if (sctp_list_single_entry(&bp->address_list)) {
5521 addr = list_entry(bp->address_list.next,
5522 struct sctp_sockaddr_entry, list);
5523 if (sctp_is_any(sk, &addr->a)) {
5524 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5525 space_left, &bytes_copied);
5535 /* Protection on the bound address list is not needed since
5536 * in the socket option context we hold a socket lock and
5537 * thus the bound address list can't change.
5539 list_for_each_entry(addr, &bp->address_list, list) {
5540 memcpy(&temp, &addr->a, sizeof(temp));
5541 addrlen = sctp_get_pf_specific(sk->sk_family)
5542 ->addr_to_user(sp, &temp);
5543 if (space_left < addrlen) {
5544 err = -ENOMEM; /*fixme: right error?*/
5547 memcpy(buf, &temp, addrlen);
5549 bytes_copied += addrlen;
5551 space_left -= addrlen;
5555 if (copy_to_user(to, addrs, bytes_copied)) {
5559 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5563 if (put_user(bytes_copied, optlen))
5570 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5572 * Requests that the local SCTP stack use the enclosed peer address as
5573 * the association primary. The enclosed address must be one of the
5574 * association peer's addresses.
5576 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5577 char __user *optval, int __user *optlen)
5579 struct sctp_prim prim;
5580 struct sctp_association *asoc;
5581 struct sctp_sock *sp = sctp_sk(sk);
5583 if (len < sizeof(struct sctp_prim))
5586 len = sizeof(struct sctp_prim);
5588 if (copy_from_user(&prim, optval, len))
5591 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5595 if (!asoc->peer.primary_path)
5598 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5599 asoc->peer.primary_path->af_specific->sockaddr_len);
5601 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5602 (union sctp_addr *)&prim.ssp_addr);
5604 if (put_user(len, optlen))
5606 if (copy_to_user(optval, &prim, len))
5613 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5615 * Requests that the local endpoint set the specified Adaptation Layer
5616 * Indication parameter for all future INIT and INIT-ACK exchanges.
5618 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5619 char __user *optval, int __user *optlen)
5621 struct sctp_setadaptation adaptation;
5623 if (len < sizeof(struct sctp_setadaptation))
5626 len = sizeof(struct sctp_setadaptation);
5628 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5630 if (put_user(len, optlen))
5632 if (copy_to_user(optval, &adaptation, len))
5640 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5642 * Applications that wish to use the sendto() system call may wish to
5643 * specify a default set of parameters that would normally be supplied
5644 * through the inclusion of ancillary data. This socket option allows
5645 * such an application to set the default sctp_sndrcvinfo structure.
5648 * The application that wishes to use this socket option simply passes
5649 * in to this call the sctp_sndrcvinfo structure defined in Section
5650 * 5.2.2) The input parameters accepted by this call include
5651 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5652 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5653 * to this call if the caller is using the UDP model.
5655 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5657 static int sctp_getsockopt_default_send_param(struct sock *sk,
5658 int len, char __user *optval,
5661 struct sctp_sock *sp = sctp_sk(sk);
5662 struct sctp_association *asoc;
5663 struct sctp_sndrcvinfo info;
5665 if (len < sizeof(info))
5670 if (copy_from_user(&info, optval, len))
5673 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5674 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5677 info.sinfo_stream = asoc->default_stream;
5678 info.sinfo_flags = asoc->default_flags;
5679 info.sinfo_ppid = asoc->default_ppid;
5680 info.sinfo_context = asoc->default_context;
5681 info.sinfo_timetolive = asoc->default_timetolive;
5683 info.sinfo_stream = sp->default_stream;
5684 info.sinfo_flags = sp->default_flags;
5685 info.sinfo_ppid = sp->default_ppid;
5686 info.sinfo_context = sp->default_context;
5687 info.sinfo_timetolive = sp->default_timetolive;
5690 if (put_user(len, optlen))
5692 if (copy_to_user(optval, &info, len))
5698 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5699 * (SCTP_DEFAULT_SNDINFO)
5701 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5702 char __user *optval,
5705 struct sctp_sock *sp = sctp_sk(sk);
5706 struct sctp_association *asoc;
5707 struct sctp_sndinfo info;
5709 if (len < sizeof(info))
5714 if (copy_from_user(&info, optval, len))
5717 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5718 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5721 info.snd_sid = asoc->default_stream;
5722 info.snd_flags = asoc->default_flags;
5723 info.snd_ppid = asoc->default_ppid;
5724 info.snd_context = asoc->default_context;
5726 info.snd_sid = sp->default_stream;
5727 info.snd_flags = sp->default_flags;
5728 info.snd_ppid = sp->default_ppid;
5729 info.snd_context = sp->default_context;
5732 if (put_user(len, optlen))
5734 if (copy_to_user(optval, &info, len))
5742 * 7.1.5 SCTP_NODELAY
5744 * Turn on/off any Nagle-like algorithm. This means that packets are
5745 * generally sent as soon as possible and no unnecessary delays are
5746 * introduced, at the cost of more packets in the network. Expects an
5747 * integer boolean flag.
5750 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5751 char __user *optval, int __user *optlen)
5755 if (len < sizeof(int))
5759 val = (sctp_sk(sk)->nodelay == 1);
5760 if (put_user(len, optlen))
5762 if (copy_to_user(optval, &val, len))
5769 * 7.1.1 SCTP_RTOINFO
5771 * The protocol parameters used to initialize and bound retransmission
5772 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5773 * and modify these parameters.
5774 * All parameters are time values, in milliseconds. A value of 0, when
5775 * modifying the parameters, indicates that the current value should not
5779 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5780 char __user *optval,
5781 int __user *optlen) {
5782 struct sctp_rtoinfo rtoinfo;
5783 struct sctp_association *asoc;
5785 if (len < sizeof (struct sctp_rtoinfo))
5788 len = sizeof(struct sctp_rtoinfo);
5790 if (copy_from_user(&rtoinfo, optval, len))
5793 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5795 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5798 /* Values corresponding to the specific association. */
5800 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5801 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5802 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5804 /* Values corresponding to the endpoint. */
5805 struct sctp_sock *sp = sctp_sk(sk);
5807 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5808 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5809 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5812 if (put_user(len, optlen))
5815 if (copy_to_user(optval, &rtoinfo, len))
5823 * 7.1.2 SCTP_ASSOCINFO
5825 * This option is used to tune the maximum retransmission attempts
5826 * of the association.
5827 * Returns an error if the new association retransmission value is
5828 * greater than the sum of the retransmission value of the peer.
5829 * See [SCTP] for more information.
5832 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5833 char __user *optval,
5837 struct sctp_assocparams assocparams;
5838 struct sctp_association *asoc;
5839 struct list_head *pos;
5842 if (len < sizeof (struct sctp_assocparams))
5845 len = sizeof(struct sctp_assocparams);
5847 if (copy_from_user(&assocparams, optval, len))
5850 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5852 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5855 /* Values correspoinding to the specific association */
5857 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5858 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5859 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5860 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5862 list_for_each(pos, &asoc->peer.transport_addr_list) {
5866 assocparams.sasoc_number_peer_destinations = cnt;
5868 /* Values corresponding to the endpoint */
5869 struct sctp_sock *sp = sctp_sk(sk);
5871 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5872 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5873 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5874 assocparams.sasoc_cookie_life =
5875 sp->assocparams.sasoc_cookie_life;
5876 assocparams.sasoc_number_peer_destinations =
5878 sasoc_number_peer_destinations;
5881 if (put_user(len, optlen))
5884 if (copy_to_user(optval, &assocparams, len))
5891 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5893 * This socket option is a boolean flag which turns on or off mapped V4
5894 * addresses. If this option is turned on and the socket is type
5895 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5896 * If this option is turned off, then no mapping will be done of V4
5897 * addresses and a user will receive both PF_INET6 and PF_INET type
5898 * addresses on the socket.
5900 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5901 char __user *optval, int __user *optlen)
5904 struct sctp_sock *sp = sctp_sk(sk);
5906 if (len < sizeof(int))
5911 if (put_user(len, optlen))
5913 if (copy_to_user(optval, &val, len))
5920 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5921 * (chapter and verse is quoted at sctp_setsockopt_context())
5923 static int sctp_getsockopt_context(struct sock *sk, int len,
5924 char __user *optval, int __user *optlen)
5926 struct sctp_assoc_value params;
5927 struct sctp_sock *sp;
5928 struct sctp_association *asoc;
5930 if (len < sizeof(struct sctp_assoc_value))
5933 len = sizeof(struct sctp_assoc_value);
5935 if (copy_from_user(¶ms, optval, len))
5940 if (params.assoc_id != 0) {
5941 asoc = sctp_id2assoc(sk, params.assoc_id);
5944 params.assoc_value = asoc->default_rcv_context;
5946 params.assoc_value = sp->default_rcv_context;
5949 if (put_user(len, optlen))
5951 if (copy_to_user(optval, ¶ms, len))
5958 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5959 * This option will get or set the maximum size to put in any outgoing
5960 * SCTP DATA chunk. If a message is larger than this size it will be
5961 * fragmented by SCTP into the specified size. Note that the underlying
5962 * SCTP implementation may fragment into smaller sized chunks when the
5963 * PMTU of the underlying association is smaller than the value set by
5964 * the user. The default value for this option is '0' which indicates
5965 * the user is NOT limiting fragmentation and only the PMTU will effect
5966 * SCTP's choice of DATA chunk size. Note also that values set larger
5967 * than the maximum size of an IP datagram will effectively let SCTP
5968 * control fragmentation (i.e. the same as setting this option to 0).
5970 * The following structure is used to access and modify this parameter:
5972 * struct sctp_assoc_value {
5973 * sctp_assoc_t assoc_id;
5974 * uint32_t assoc_value;
5977 * assoc_id: This parameter is ignored for one-to-one style sockets.
5978 * For one-to-many style sockets this parameter indicates which
5979 * association the user is performing an action upon. Note that if
5980 * this field's value is zero then the endpoints default value is
5981 * changed (effecting future associations only).
5982 * assoc_value: This parameter specifies the maximum size in bytes.
5984 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5985 char __user *optval, int __user *optlen)
5987 struct sctp_assoc_value params;
5988 struct sctp_association *asoc;
5990 if (len == sizeof(int)) {
5991 pr_warn_ratelimited(DEPRECATED
5993 "Use of int in maxseg socket option.\n"
5994 "Use struct sctp_assoc_value instead\n",
5995 current->comm, task_pid_nr(current));
5996 params.assoc_id = 0;
5997 } else if (len >= sizeof(struct sctp_assoc_value)) {
5998 len = sizeof(struct sctp_assoc_value);
5999 if (copy_from_user(¶ms, optval, sizeof(params)))
6004 asoc = sctp_id2assoc(sk, params.assoc_id);
6005 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6009 params.assoc_value = asoc->frag_point;
6011 params.assoc_value = sctp_sk(sk)->user_frag;
6013 if (put_user(len, optlen))
6015 if (len == sizeof(int)) {
6016 if (copy_to_user(optval, ¶ms.assoc_value, len))
6019 if (copy_to_user(optval, ¶ms, len))
6027 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6028 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6030 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6031 char __user *optval, int __user *optlen)
6035 if (len < sizeof(int))
6040 val = sctp_sk(sk)->frag_interleave;
6041 if (put_user(len, optlen))
6043 if (copy_to_user(optval, &val, len))
6050 * 7.1.25. Set or Get the sctp partial delivery point
6051 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6053 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6054 char __user *optval,
6059 if (len < sizeof(u32))
6064 val = sctp_sk(sk)->pd_point;
6065 if (put_user(len, optlen))
6067 if (copy_to_user(optval, &val, len))
6074 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6075 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6077 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6078 char __user *optval,
6081 struct sctp_assoc_value params;
6082 struct sctp_sock *sp;
6083 struct sctp_association *asoc;
6085 if (len == sizeof(int)) {
6086 pr_warn_ratelimited(DEPRECATED
6088 "Use of int in max_burst socket option.\n"
6089 "Use struct sctp_assoc_value instead\n",
6090 current->comm, task_pid_nr(current));
6091 params.assoc_id = 0;
6092 } else if (len >= sizeof(struct sctp_assoc_value)) {
6093 len = sizeof(struct sctp_assoc_value);
6094 if (copy_from_user(¶ms, optval, len))
6101 if (params.assoc_id != 0) {
6102 asoc = sctp_id2assoc(sk, params.assoc_id);
6105 params.assoc_value = asoc->max_burst;
6107 params.assoc_value = sp->max_burst;
6109 if (len == sizeof(int)) {
6110 if (copy_to_user(optval, ¶ms.assoc_value, len))
6113 if (copy_to_user(optval, ¶ms, len))
6121 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6122 char __user *optval, int __user *optlen)
6124 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6125 struct sctp_hmacalgo __user *p = (void __user *)optval;
6126 struct sctp_hmac_algo_param *hmacs;
6131 if (!ep->auth_enable)
6134 hmacs = ep->auth_hmacs_list;
6135 data_len = ntohs(hmacs->param_hdr.length) -
6136 sizeof(struct sctp_paramhdr);
6138 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6141 len = sizeof(struct sctp_hmacalgo) + data_len;
6142 num_idents = data_len / sizeof(u16);
6144 if (put_user(len, optlen))
6146 if (put_user(num_idents, &p->shmac_num_idents))
6148 for (i = 0; i < num_idents; i++) {
6149 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6151 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6157 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6158 char __user *optval, int __user *optlen)
6160 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6161 struct sctp_authkeyid val;
6162 struct sctp_association *asoc;
6164 if (!ep->auth_enable)
6167 if (len < sizeof(struct sctp_authkeyid))
6169 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
6172 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6173 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6177 val.scact_keynumber = asoc->active_key_id;
6179 val.scact_keynumber = ep->active_key_id;
6181 len = sizeof(struct sctp_authkeyid);
6182 if (put_user(len, optlen))
6184 if (copy_to_user(optval, &val, len))
6190 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6191 char __user *optval, int __user *optlen)
6193 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6194 struct sctp_authchunks __user *p = (void __user *)optval;
6195 struct sctp_authchunks val;
6196 struct sctp_association *asoc;
6197 struct sctp_chunks_param *ch;
6201 if (!ep->auth_enable)
6204 if (len < sizeof(struct sctp_authchunks))
6207 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6210 to = p->gauth_chunks;
6211 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6215 ch = asoc->peer.peer_chunks;
6219 /* See if the user provided enough room for all the data */
6220 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6221 if (len < num_chunks)
6224 if (copy_to_user(to, ch->chunks, num_chunks))
6227 len = sizeof(struct sctp_authchunks) + num_chunks;
6228 if (put_user(len, optlen))
6230 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6235 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6236 char __user *optval, int __user *optlen)
6238 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6239 struct sctp_authchunks __user *p = (void __user *)optval;
6240 struct sctp_authchunks val;
6241 struct sctp_association *asoc;
6242 struct sctp_chunks_param *ch;
6246 if (!ep->auth_enable)
6249 if (len < sizeof(struct sctp_authchunks))
6252 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
6255 to = p->gauth_chunks;
6256 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6257 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6261 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6263 ch = ep->auth_chunk_list;
6268 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6269 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6272 if (copy_to_user(to, ch->chunks, num_chunks))
6275 len = sizeof(struct sctp_authchunks) + num_chunks;
6276 if (put_user(len, optlen))
6278 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6285 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6286 * This option gets the current number of associations that are attached
6287 * to a one-to-many style socket. The option value is an uint32_t.
6289 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6290 char __user *optval, int __user *optlen)
6292 struct sctp_sock *sp = sctp_sk(sk);
6293 struct sctp_association *asoc;
6296 if (sctp_style(sk, TCP))
6299 if (len < sizeof(u32))
6304 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6308 if (put_user(len, optlen))
6310 if (copy_to_user(optval, &val, len))
6317 * 8.1.23 SCTP_AUTO_ASCONF
6318 * See the corresponding setsockopt entry as description
6320 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6321 char __user *optval, int __user *optlen)
6325 if (len < sizeof(int))
6329 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6331 if (put_user(len, optlen))
6333 if (copy_to_user(optval, &val, len))
6339 * 8.2.6. Get the Current Identifiers of Associations
6340 * (SCTP_GET_ASSOC_ID_LIST)
6342 * This option gets the current list of SCTP association identifiers of
6343 * the SCTP associations handled by a one-to-many style socket.
6345 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6346 char __user *optval, int __user *optlen)
6348 struct sctp_sock *sp = sctp_sk(sk);
6349 struct sctp_association *asoc;
6350 struct sctp_assoc_ids *ids;
6353 if (sctp_style(sk, TCP))
6356 if (len < sizeof(struct sctp_assoc_ids))
6359 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6363 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6366 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6368 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6372 ids->gaids_number_of_ids = num;
6374 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6375 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6378 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6388 * SCTP_PEER_ADDR_THLDS
6390 * This option allows us to fetch the partially failed threshold for one or all
6391 * transports in an association. See Section 6.1 of:
6392 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6394 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6395 char __user *optval,
6399 struct sctp_paddrthlds val;
6400 struct sctp_transport *trans;
6401 struct sctp_association *asoc;
6403 if (len < sizeof(struct sctp_paddrthlds))
6405 len = sizeof(struct sctp_paddrthlds);
6406 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6409 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6410 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6414 val.spt_pathpfthld = asoc->pf_retrans;
6415 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6417 trans = sctp_addr_id2transport(sk, &val.spt_address,
6422 val.spt_pathmaxrxt = trans->pathmaxrxt;
6423 val.spt_pathpfthld = trans->pf_retrans;
6426 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6433 * SCTP_GET_ASSOC_STATS
6435 * This option retrieves local per endpoint statistics. It is modeled
6436 * after OpenSolaris' implementation
6438 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6439 char __user *optval,
6442 struct sctp_assoc_stats sas;
6443 struct sctp_association *asoc = NULL;
6445 /* User must provide at least the assoc id */
6446 if (len < sizeof(sctp_assoc_t))
6449 /* Allow the struct to grow and fill in as much as possible */
6450 len = min_t(size_t, len, sizeof(sas));
6452 if (copy_from_user(&sas, optval, len))
6455 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6459 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6460 sas.sas_gapcnt = asoc->stats.gapcnt;
6461 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6462 sas.sas_osacks = asoc->stats.osacks;
6463 sas.sas_isacks = asoc->stats.isacks;
6464 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6465 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6466 sas.sas_oodchunks = asoc->stats.oodchunks;
6467 sas.sas_iodchunks = asoc->stats.iodchunks;
6468 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6469 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6470 sas.sas_idupchunks = asoc->stats.idupchunks;
6471 sas.sas_opackets = asoc->stats.opackets;
6472 sas.sas_ipackets = asoc->stats.ipackets;
6474 /* New high max rto observed, will return 0 if not a single
6475 * RTO update took place. obs_rto_ipaddr will be bogus
6478 sas.sas_maxrto = asoc->stats.max_obs_rto;
6479 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6480 sizeof(struct sockaddr_storage));
6482 /* Mark beginning of a new observation period */
6483 asoc->stats.max_obs_rto = asoc->rto_min;
6485 if (put_user(len, optlen))
6488 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6490 if (copy_to_user(optval, &sas, len))
6496 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6497 char __user *optval,
6502 if (len < sizeof(int))
6506 if (sctp_sk(sk)->recvrcvinfo)
6508 if (put_user(len, optlen))
6510 if (copy_to_user(optval, &val, len))
6516 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6517 char __user *optval,
6522 if (len < sizeof(int))
6526 if (sctp_sk(sk)->recvnxtinfo)
6528 if (put_user(len, optlen))
6530 if (copy_to_user(optval, &val, len))
6536 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6537 char __user *optval,
6540 struct sctp_assoc_value params;
6541 struct sctp_association *asoc;
6542 int retval = -EFAULT;
6544 if (len < sizeof(params)) {
6549 len = sizeof(params);
6550 if (copy_from_user(¶ms, optval, len))
6553 asoc = sctp_id2assoc(sk, params.assoc_id);
6555 params.assoc_value = asoc->prsctp_enable;
6556 } else if (!params.assoc_id) {
6557 struct sctp_sock *sp = sctp_sk(sk);
6559 params.assoc_value = sp->ep->prsctp_enable;
6565 if (put_user(len, optlen))
6568 if (copy_to_user(optval, ¶ms, len))
6577 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6578 char __user *optval,
6581 struct sctp_default_prinfo info;
6582 struct sctp_association *asoc;
6583 int retval = -EFAULT;
6585 if (len < sizeof(info)) {
6591 if (copy_from_user(&info, optval, len))
6594 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6596 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6597 info.pr_value = asoc->default_timetolive;
6598 } else if (!info.pr_assoc_id) {
6599 struct sctp_sock *sp = sctp_sk(sk);
6601 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6602 info.pr_value = sp->default_timetolive;
6608 if (put_user(len, optlen))
6611 if (copy_to_user(optval, &info, len))
6620 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6621 char __user *optval,
6624 struct sctp_prstatus params;
6625 struct sctp_association *asoc;
6627 int retval = -EINVAL;
6629 if (len < sizeof(params))
6632 len = sizeof(params);
6633 if (copy_from_user(¶ms, optval, len)) {
6638 policy = params.sprstat_policy;
6639 if (policy & ~SCTP_PR_SCTP_MASK)
6642 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6646 if (policy == SCTP_PR_SCTP_NONE) {
6647 params.sprstat_abandoned_unsent = 0;
6648 params.sprstat_abandoned_sent = 0;
6649 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6650 params.sprstat_abandoned_unsent +=
6651 asoc->abandoned_unsent[policy];
6652 params.sprstat_abandoned_sent +=
6653 asoc->abandoned_sent[policy];
6656 params.sprstat_abandoned_unsent =
6657 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6658 params.sprstat_abandoned_sent =
6659 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6662 if (put_user(len, optlen)) {
6667 if (copy_to_user(optval, ¶ms, len)) {
6678 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
6679 char __user *optval,
6682 struct sctp_stream_out *streamout;
6683 struct sctp_association *asoc;
6684 struct sctp_prstatus params;
6685 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);
6702 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6705 streamout = &asoc->stream.out[params.sprstat_sid];
6706 if (policy == SCTP_PR_SCTP_NONE) {
6707 params.sprstat_abandoned_unsent = 0;
6708 params.sprstat_abandoned_sent = 0;
6709 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6710 params.sprstat_abandoned_unsent +=
6711 streamout->abandoned_unsent[policy];
6712 params.sprstat_abandoned_sent +=
6713 streamout->abandoned_sent[policy];
6716 params.sprstat_abandoned_unsent =
6717 streamout->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6718 params.sprstat_abandoned_sent =
6719 streamout->abandoned_sent[__SCTP_PR_INDEX(policy)];
6722 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
6733 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
6734 char __user *optval,
6737 struct sctp_assoc_value params;
6738 struct sctp_association *asoc;
6739 int retval = -EFAULT;
6741 if (len < sizeof(params)) {
6746 len = sizeof(params);
6747 if (copy_from_user(¶ms, optval, len))
6750 asoc = sctp_id2assoc(sk, params.assoc_id);
6752 params.assoc_value = asoc->reconf_enable;
6753 } else if (!params.assoc_id) {
6754 struct sctp_sock *sp = sctp_sk(sk);
6756 params.assoc_value = sp->ep->reconf_enable;
6762 if (put_user(len, optlen))
6765 if (copy_to_user(optval, ¶ms, len))
6774 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
6775 char __user *optval,
6778 struct sctp_assoc_value params;
6779 struct sctp_association *asoc;
6780 int retval = -EFAULT;
6782 if (len < sizeof(params)) {
6787 len = sizeof(params);
6788 if (copy_from_user(¶ms, optval, len))
6791 asoc = sctp_id2assoc(sk, params.assoc_id);
6793 params.assoc_value = asoc->strreset_enable;
6794 } else if (!params.assoc_id) {
6795 struct sctp_sock *sp = sctp_sk(sk);
6797 params.assoc_value = sp->ep->strreset_enable;
6803 if (put_user(len, optlen))
6806 if (copy_to_user(optval, ¶ms, len))
6815 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6816 char __user *optval, int __user *optlen)
6821 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6823 /* I can hardly begin to describe how wrong this is. This is
6824 * so broken as to be worse than useless. The API draft
6825 * REALLY is NOT helpful here... I am not convinced that the
6826 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6827 * are at all well-founded.
6829 if (level != SOL_SCTP) {
6830 struct sctp_af *af = sctp_sk(sk)->pf->af;
6832 retval = af->getsockopt(sk, level, optname, optval, optlen);
6836 if (get_user(len, optlen))
6846 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
6848 case SCTP_DISABLE_FRAGMENTS:
6849 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
6853 retval = sctp_getsockopt_events(sk, len, optval, optlen);
6855 case SCTP_AUTOCLOSE:
6856 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
6858 case SCTP_SOCKOPT_PEELOFF:
6859 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
6861 case SCTP_SOCKOPT_PEELOFF_FLAGS:
6862 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
6864 case SCTP_PEER_ADDR_PARAMS:
6865 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
6868 case SCTP_DELAYED_SACK:
6869 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6873 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6875 case SCTP_GET_PEER_ADDRS:
6876 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6879 case SCTP_GET_LOCAL_ADDRS:
6880 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6883 case SCTP_SOCKOPT_CONNECTX3:
6884 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6886 case SCTP_DEFAULT_SEND_PARAM:
6887 retval = sctp_getsockopt_default_send_param(sk, len,
6890 case SCTP_DEFAULT_SNDINFO:
6891 retval = sctp_getsockopt_default_sndinfo(sk, len,
6894 case SCTP_PRIMARY_ADDR:
6895 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6898 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6901 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6903 case SCTP_ASSOCINFO:
6904 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6906 case SCTP_I_WANT_MAPPED_V4_ADDR:
6907 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6910 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6912 case SCTP_GET_PEER_ADDR_INFO:
6913 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6916 case SCTP_ADAPTATION_LAYER:
6917 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6921 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6923 case SCTP_FRAGMENT_INTERLEAVE:
6924 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6927 case SCTP_PARTIAL_DELIVERY_POINT:
6928 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6931 case SCTP_MAX_BURST:
6932 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6935 case SCTP_AUTH_CHUNK:
6936 case SCTP_AUTH_DELETE_KEY:
6937 retval = -EOPNOTSUPP;
6939 case SCTP_HMAC_IDENT:
6940 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6942 case SCTP_AUTH_ACTIVE_KEY:
6943 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6945 case SCTP_PEER_AUTH_CHUNKS:
6946 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6949 case SCTP_LOCAL_AUTH_CHUNKS:
6950 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6953 case SCTP_GET_ASSOC_NUMBER:
6954 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6956 case SCTP_GET_ASSOC_ID_LIST:
6957 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6959 case SCTP_AUTO_ASCONF:
6960 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6962 case SCTP_PEER_ADDR_THLDS:
6963 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6965 case SCTP_GET_ASSOC_STATS:
6966 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6968 case SCTP_RECVRCVINFO:
6969 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6971 case SCTP_RECVNXTINFO:
6972 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6974 case SCTP_PR_SUPPORTED:
6975 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
6977 case SCTP_DEFAULT_PRINFO:
6978 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
6981 case SCTP_PR_ASSOC_STATUS:
6982 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
6985 case SCTP_PR_STREAM_STATUS:
6986 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
6989 case SCTP_RECONFIG_SUPPORTED:
6990 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
6993 case SCTP_ENABLE_STREAM_RESET:
6994 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
6998 retval = -ENOPROTOOPT;
7006 static int sctp_hash(struct sock *sk)
7012 static void sctp_unhash(struct sock *sk)
7017 /* Check if port is acceptable. Possibly find first available port.
7019 * The port hash table (contained in the 'global' SCTP protocol storage
7020 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7021 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7022 * list (the list number is the port number hashed out, so as you
7023 * would expect from a hash function, all the ports in a given list have
7024 * such a number that hashes out to the same list number; you were
7025 * expecting that, right?); so each list has a set of ports, with a
7026 * link to the socket (struct sock) that uses it, the port number and
7027 * a fastreuse flag (FIXME: NPI ipg).
7029 static struct sctp_bind_bucket *sctp_bucket_create(
7030 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7032 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7034 struct sctp_bind_hashbucket *head; /* hash list */
7035 struct sctp_bind_bucket *pp;
7036 unsigned short snum;
7039 snum = ntohs(addr->v4.sin_port);
7041 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7046 /* Search for an available port. */
7047 int low, high, remaining, index;
7049 struct net *net = sock_net(sk);
7051 inet_get_local_port_range(net, &low, &high);
7052 remaining = (high - low) + 1;
7053 rover = prandom_u32() % remaining + low;
7057 if ((rover < low) || (rover > high))
7059 if (inet_is_local_reserved_port(net, rover))
7061 index = sctp_phashfn(sock_net(sk), rover);
7062 head = &sctp_port_hashtable[index];
7063 spin_lock(&head->lock);
7064 sctp_for_each_hentry(pp, &head->chain)
7065 if ((pp->port == rover) &&
7066 net_eq(sock_net(sk), pp->net))
7070 spin_unlock(&head->lock);
7071 } while (--remaining > 0);
7073 /* Exhausted local port range during search? */
7078 /* OK, here is the one we will use. HEAD (the port
7079 * hash table list entry) is non-NULL and we hold it's
7084 /* We are given an specific port number; we verify
7085 * that it is not being used. If it is used, we will
7086 * exahust the search in the hash list corresponding
7087 * to the port number (snum) - we detect that with the
7088 * port iterator, pp being NULL.
7090 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7091 spin_lock(&head->lock);
7092 sctp_for_each_hentry(pp, &head->chain) {
7093 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7100 if (!hlist_empty(&pp->owner)) {
7101 /* We had a port hash table hit - there is an
7102 * available port (pp != NULL) and it is being
7103 * used by other socket (pp->owner not empty); that other
7104 * socket is going to be sk2.
7106 int reuse = sk->sk_reuse;
7109 pr_debug("%s: found a possible match\n", __func__);
7111 if (pp->fastreuse && sk->sk_reuse &&
7112 sk->sk_state != SCTP_SS_LISTENING)
7115 /* Run through the list of sockets bound to the port
7116 * (pp->port) [via the pointers bind_next and
7117 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7118 * we get the endpoint they describe and run through
7119 * the endpoint's list of IP (v4 or v6) addresses,
7120 * comparing each of the addresses with the address of
7121 * the socket sk. If we find a match, then that means
7122 * that this port/socket (sk) combination are already
7125 sk_for_each_bound(sk2, &pp->owner) {
7126 struct sctp_endpoint *ep2;
7127 ep2 = sctp_sk(sk2)->ep;
7130 (reuse && sk2->sk_reuse &&
7131 sk2->sk_state != SCTP_SS_LISTENING))
7134 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7135 sctp_sk(sk2), sctp_sk(sk))) {
7141 pr_debug("%s: found a match\n", __func__);
7144 /* If there was a hash table miss, create a new port. */
7146 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7149 /* In either case (hit or miss), make sure fastreuse is 1 only
7150 * if sk->sk_reuse is too (that is, if the caller requested
7151 * SO_REUSEADDR on this socket -sk-).
7153 if (hlist_empty(&pp->owner)) {
7154 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
7158 } else if (pp->fastreuse &&
7159 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
7162 /* We are set, so fill up all the data in the hash table
7163 * entry, tie the socket list information with the rest of the
7164 * sockets FIXME: Blurry, NPI (ipg).
7167 if (!sctp_sk(sk)->bind_hash) {
7168 inet_sk(sk)->inet_num = snum;
7169 sk_add_bind_node(sk, &pp->owner);
7170 sctp_sk(sk)->bind_hash = pp;
7175 spin_unlock(&head->lock);
7182 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7183 * port is requested.
7185 static int sctp_get_port(struct sock *sk, unsigned short snum)
7187 union sctp_addr addr;
7188 struct sctp_af *af = sctp_sk(sk)->pf->af;
7190 /* Set up a dummy address struct from the sk. */
7191 af->from_sk(&addr, sk);
7192 addr.v4.sin_port = htons(snum);
7194 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7195 return !!sctp_get_port_local(sk, &addr);
7199 * Move a socket to LISTENING state.
7201 static int sctp_listen_start(struct sock *sk, int backlog)
7203 struct sctp_sock *sp = sctp_sk(sk);
7204 struct sctp_endpoint *ep = sp->ep;
7205 struct crypto_shash *tfm = NULL;
7208 /* Allocate HMAC for generating cookie. */
7209 if (!sp->hmac && sp->sctp_hmac_alg) {
7210 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7211 tfm = crypto_alloc_shash(alg, 0, 0);
7213 net_info_ratelimited("failed to load transform for %s: %ld\n",
7214 sp->sctp_hmac_alg, PTR_ERR(tfm));
7217 sctp_sk(sk)->hmac = tfm;
7221 * If a bind() or sctp_bindx() is not called prior to a listen()
7222 * call that allows new associations to be accepted, the system
7223 * picks an ephemeral port and will choose an address set equivalent
7224 * to binding with a wildcard address.
7226 * This is not currently spelled out in the SCTP sockets
7227 * extensions draft, but follows the practice as seen in TCP
7231 sk->sk_state = SCTP_SS_LISTENING;
7232 if (!ep->base.bind_addr.port) {
7233 if (sctp_autobind(sk))
7236 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7237 sk->sk_state = SCTP_SS_CLOSED;
7242 sk->sk_max_ack_backlog = backlog;
7243 sctp_hash_endpoint(ep);
7248 * 4.1.3 / 5.1.3 listen()
7250 * By default, new associations are not accepted for UDP style sockets.
7251 * An application uses listen() to mark a socket as being able to
7252 * accept new associations.
7254 * On TCP style sockets, applications use listen() to ready the SCTP
7255 * endpoint for accepting inbound associations.
7257 * On both types of endpoints a backlog of '0' disables listening.
7259 * Move a socket to LISTENING state.
7261 int sctp_inet_listen(struct socket *sock, int backlog)
7263 struct sock *sk = sock->sk;
7264 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7267 if (unlikely(backlog < 0))
7272 /* Peeled-off sockets are not allowed to listen(). */
7273 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7276 if (sock->state != SS_UNCONNECTED)
7279 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7282 /* If backlog is zero, disable listening. */
7284 if (sctp_sstate(sk, CLOSED))
7288 sctp_unhash_endpoint(ep);
7289 sk->sk_state = SCTP_SS_CLOSED;
7291 sctp_sk(sk)->bind_hash->fastreuse = 1;
7295 /* If we are already listening, just update the backlog */
7296 if (sctp_sstate(sk, LISTENING))
7297 sk->sk_max_ack_backlog = backlog;
7299 err = sctp_listen_start(sk, backlog);
7311 * This function is done by modeling the current datagram_poll() and the
7312 * tcp_poll(). Note that, based on these implementations, we don't
7313 * lock the socket in this function, even though it seems that,
7314 * ideally, locking or some other mechanisms can be used to ensure
7315 * the integrity of the counters (sndbuf and wmem_alloc) used
7316 * in this place. We assume that we don't need locks either until proven
7319 * Another thing to note is that we include the Async I/O support
7320 * here, again, by modeling the current TCP/UDP code. We don't have
7321 * a good way to test with it yet.
7323 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7325 struct sock *sk = sock->sk;
7326 struct sctp_sock *sp = sctp_sk(sk);
7329 poll_wait(file, sk_sleep(sk), wait);
7331 sock_rps_record_flow(sk);
7333 /* A TCP-style listening socket becomes readable when the accept queue
7336 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7337 return (!list_empty(&sp->ep->asocs)) ?
7338 (POLLIN | POLLRDNORM) : 0;
7342 /* Is there any exceptional events? */
7343 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7345 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
7346 if (sk->sk_shutdown & RCV_SHUTDOWN)
7347 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
7348 if (sk->sk_shutdown == SHUTDOWN_MASK)
7351 /* Is it readable? Reconsider this code with TCP-style support. */
7352 if (!skb_queue_empty(&sk->sk_receive_queue))
7353 mask |= POLLIN | POLLRDNORM;
7355 /* The association is either gone or not ready. */
7356 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7359 /* Is it writable? */
7360 if (sctp_writeable(sk)) {
7361 mask |= POLLOUT | POLLWRNORM;
7363 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7365 * Since the socket is not locked, the buffer
7366 * might be made available after the writeable check and
7367 * before the bit is set. This could cause a lost I/O
7368 * signal. tcp_poll() has a race breaker for this race
7369 * condition. Based on their implementation, we put
7370 * in the following code to cover it as well.
7372 if (sctp_writeable(sk))
7373 mask |= POLLOUT | POLLWRNORM;
7378 /********************************************************************
7379 * 2nd Level Abstractions
7380 ********************************************************************/
7382 static struct sctp_bind_bucket *sctp_bucket_create(
7383 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
7385 struct sctp_bind_bucket *pp;
7387 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
7389 SCTP_DBG_OBJCNT_INC(bind_bucket);
7392 INIT_HLIST_HEAD(&pp->owner);
7394 hlist_add_head(&pp->node, &head->chain);
7399 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7400 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7402 if (pp && hlist_empty(&pp->owner)) {
7403 __hlist_del(&pp->node);
7404 kmem_cache_free(sctp_bucket_cachep, pp);
7405 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7409 /* Release this socket's reference to a local port. */
7410 static inline void __sctp_put_port(struct sock *sk)
7412 struct sctp_bind_hashbucket *head =
7413 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7414 inet_sk(sk)->inet_num)];
7415 struct sctp_bind_bucket *pp;
7417 spin_lock(&head->lock);
7418 pp = sctp_sk(sk)->bind_hash;
7419 __sk_del_bind_node(sk);
7420 sctp_sk(sk)->bind_hash = NULL;
7421 inet_sk(sk)->inet_num = 0;
7422 sctp_bucket_destroy(pp);
7423 spin_unlock(&head->lock);
7426 void sctp_put_port(struct sock *sk)
7429 __sctp_put_port(sk);
7434 * The system picks an ephemeral port and choose an address set equivalent
7435 * to binding with a wildcard address.
7436 * One of those addresses will be the primary address for the association.
7437 * This automatically enables the multihoming capability of SCTP.
7439 static int sctp_autobind(struct sock *sk)
7441 union sctp_addr autoaddr;
7445 /* Initialize a local sockaddr structure to INADDR_ANY. */
7446 af = sctp_sk(sk)->pf->af;
7448 port = htons(inet_sk(sk)->inet_num);
7449 af->inaddr_any(&autoaddr, port);
7451 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7454 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7457 * 4.2 The cmsghdr Structure *
7459 * When ancillary data is sent or received, any number of ancillary data
7460 * objects can be specified by the msg_control and msg_controllen members of
7461 * the msghdr structure, because each object is preceded by
7462 * a cmsghdr structure defining the object's length (the cmsg_len member).
7463 * Historically Berkeley-derived implementations have passed only one object
7464 * at a time, but this API allows multiple objects to be
7465 * passed in a single call to sendmsg() or recvmsg(). The following example
7466 * shows two ancillary data objects in a control buffer.
7468 * |<--------------------------- msg_controllen -------------------------->|
7471 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7473 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7476 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7478 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7481 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7482 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7484 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7486 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7493 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
7495 struct msghdr *my_msg = (struct msghdr *)msg;
7496 struct cmsghdr *cmsg;
7498 for_each_cmsghdr(cmsg, my_msg) {
7499 if (!CMSG_OK(my_msg, cmsg))
7502 /* Should we parse this header or ignore? */
7503 if (cmsg->cmsg_level != IPPROTO_SCTP)
7506 /* Strictly check lengths following example in SCM code. */
7507 switch (cmsg->cmsg_type) {
7509 /* SCTP Socket API Extension
7510 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7512 * This cmsghdr structure provides information for
7513 * initializing new SCTP associations with sendmsg().
7514 * The SCTP_INITMSG socket option uses this same data
7515 * structure. This structure is not used for
7518 * cmsg_level cmsg_type cmsg_data[]
7519 * ------------ ------------ ----------------------
7520 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7522 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
7525 cmsgs->init = CMSG_DATA(cmsg);
7529 /* SCTP Socket API Extension
7530 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7532 * This cmsghdr structure specifies SCTP options for
7533 * sendmsg() and describes SCTP header information
7534 * about a received message through recvmsg().
7536 * cmsg_level cmsg_type cmsg_data[]
7537 * ------------ ------------ ----------------------
7538 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7540 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
7543 cmsgs->srinfo = CMSG_DATA(cmsg);
7545 if (cmsgs->srinfo->sinfo_flags &
7546 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7547 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7548 SCTP_ABORT | SCTP_EOF))
7553 /* SCTP Socket API Extension
7554 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7556 * This cmsghdr structure specifies SCTP options for
7557 * sendmsg(). This structure and SCTP_RCVINFO replaces
7558 * SCTP_SNDRCV which has been deprecated.
7560 * cmsg_level cmsg_type cmsg_data[]
7561 * ------------ ------------ ---------------------
7562 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7564 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7567 cmsgs->sinfo = CMSG_DATA(cmsg);
7569 if (cmsgs->sinfo->snd_flags &
7570 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7571 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7572 SCTP_ABORT | SCTP_EOF))
7584 * Wait for a packet..
7585 * Note: This function is the same function as in core/datagram.c
7586 * with a few modifications to make lksctp work.
7588 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
7593 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7595 /* Socket errors? */
7596 error = sock_error(sk);
7600 if (!skb_queue_empty(&sk->sk_receive_queue))
7603 /* Socket shut down? */
7604 if (sk->sk_shutdown & RCV_SHUTDOWN)
7607 /* Sequenced packets can come disconnected. If so we report the
7612 /* Is there a good reason to think that we may receive some data? */
7613 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
7616 /* Handle signals. */
7617 if (signal_pending(current))
7620 /* Let another process have a go. Since we are going to sleep
7621 * anyway. Note: This may cause odd behaviors if the message
7622 * does not fit in the user's buffer, but this seems to be the
7623 * only way to honor MSG_DONTWAIT realistically.
7626 *timeo_p = schedule_timeout(*timeo_p);
7630 finish_wait(sk_sleep(sk), &wait);
7634 error = sock_intr_errno(*timeo_p);
7637 finish_wait(sk_sleep(sk), &wait);
7642 /* Receive a datagram.
7643 * Note: This is pretty much the same routine as in core/datagram.c
7644 * with a few changes to make lksctp work.
7646 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
7647 int noblock, int *err)
7650 struct sk_buff *skb;
7653 timeo = sock_rcvtimeo(sk, noblock);
7655 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
7656 MAX_SCHEDULE_TIMEOUT);
7659 /* Again only user level code calls this function,
7660 * so nothing interrupt level
7661 * will suddenly eat the receive_queue.
7663 * Look at current nfs client by the way...
7664 * However, this function was correct in any case. 8)
7666 if (flags & MSG_PEEK) {
7667 skb = skb_peek(&sk->sk_receive_queue);
7669 refcount_inc(&skb->users);
7671 skb = __skb_dequeue(&sk->sk_receive_queue);
7677 /* Caller is allowed not to check sk->sk_err before calling. */
7678 error = sock_error(sk);
7682 if (sk->sk_shutdown & RCV_SHUTDOWN)
7685 if (sk_can_busy_loop(sk)) {
7686 sk_busy_loop(sk, noblock);
7688 if (!skb_queue_empty(&sk->sk_receive_queue))
7692 /* User doesn't want to wait. */
7696 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
7705 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7706 static void __sctp_write_space(struct sctp_association *asoc)
7708 struct sock *sk = asoc->base.sk;
7710 if (sctp_wspace(asoc) <= 0)
7713 if (waitqueue_active(&asoc->wait))
7714 wake_up_interruptible(&asoc->wait);
7716 if (sctp_writeable(sk)) {
7717 struct socket_wq *wq;
7720 wq = rcu_dereference(sk->sk_wq);
7722 if (waitqueue_active(&wq->wait))
7723 wake_up_interruptible(&wq->wait);
7725 /* Note that we try to include the Async I/O support
7726 * here by modeling from the current TCP/UDP code.
7727 * We have not tested with it yet.
7729 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7730 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
7736 static void sctp_wake_up_waiters(struct sock *sk,
7737 struct sctp_association *asoc)
7739 struct sctp_association *tmp = asoc;
7741 /* We do accounting for the sndbuf space per association,
7742 * so we only need to wake our own association.
7744 if (asoc->ep->sndbuf_policy)
7745 return __sctp_write_space(asoc);
7747 /* If association goes down and is just flushing its
7748 * outq, then just normally notify others.
7750 if (asoc->base.dead)
7751 return sctp_write_space(sk);
7753 /* Accounting for the sndbuf space is per socket, so we
7754 * need to wake up others, try to be fair and in case of
7755 * other associations, let them have a go first instead
7756 * of just doing a sctp_write_space() call.
7758 * Note that we reach sctp_wake_up_waiters() only when
7759 * associations free up queued chunks, thus we are under
7760 * lock and the list of associations on a socket is
7761 * guaranteed not to change.
7763 for (tmp = list_next_entry(tmp, asocs); 1;
7764 tmp = list_next_entry(tmp, asocs)) {
7765 /* Manually skip the head element. */
7766 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
7768 /* Wake up association. */
7769 __sctp_write_space(tmp);
7770 /* We've reached the end. */
7776 /* Do accounting for the sndbuf space.
7777 * Decrement the used sndbuf space of the corresponding association by the
7778 * data size which was just transmitted(freed).
7780 static void sctp_wfree(struct sk_buff *skb)
7782 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
7783 struct sctp_association *asoc = chunk->asoc;
7784 struct sock *sk = asoc->base.sk;
7786 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
7787 sizeof(struct sk_buff) +
7788 sizeof(struct sctp_chunk);
7790 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
7793 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7795 sk->sk_wmem_queued -= skb->truesize;
7796 sk_mem_uncharge(sk, skb->truesize);
7799 sctp_wake_up_waiters(sk, asoc);
7801 sctp_association_put(asoc);
7804 /* Do accounting for the receive space on the socket.
7805 * Accounting for the association is done in ulpevent.c
7806 * We set this as a destructor for the cloned data skbs so that
7807 * accounting is done at the correct time.
7809 void sctp_sock_rfree(struct sk_buff *skb)
7811 struct sock *sk = skb->sk;
7812 struct sctp_ulpevent *event = sctp_skb2event(skb);
7814 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
7817 * Mimic the behavior of sock_rfree
7819 sk_mem_uncharge(sk, event->rmem_len);
7823 /* Helper function to wait for space in the sndbuf. */
7824 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
7827 struct sock *sk = asoc->base.sk;
7829 long current_timeo = *timeo_p;
7832 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
7835 /* Increment the association's refcnt. */
7836 sctp_association_hold(asoc);
7838 /* Wait on the association specific sndbuf space. */
7840 prepare_to_wait_exclusive(&asoc->wait, &wait,
7841 TASK_INTERRUPTIBLE);
7844 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7847 if (signal_pending(current))
7848 goto do_interrupted;
7849 if (msg_len <= sctp_wspace(asoc))
7852 /* Let another process have a go. Since we are going
7856 current_timeo = schedule_timeout(current_timeo);
7859 *timeo_p = current_timeo;
7863 finish_wait(&asoc->wait, &wait);
7865 /* Release the association's refcnt. */
7866 sctp_association_put(asoc);
7875 err = sock_intr_errno(*timeo_p);
7883 void sctp_data_ready(struct sock *sk)
7885 struct socket_wq *wq;
7888 wq = rcu_dereference(sk->sk_wq);
7889 if (skwq_has_sleeper(wq))
7890 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
7891 POLLRDNORM | POLLRDBAND);
7892 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
7896 /* If socket sndbuf has changed, wake up all per association waiters. */
7897 void sctp_write_space(struct sock *sk)
7899 struct sctp_association *asoc;
7901 /* Wake up the tasks in each wait queue. */
7902 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
7903 __sctp_write_space(asoc);
7907 /* Is there any sndbuf space available on the socket?
7909 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
7910 * associations on the same socket. For a UDP-style socket with
7911 * multiple associations, it is possible for it to be "unwriteable"
7912 * prematurely. I assume that this is acceptable because
7913 * a premature "unwriteable" is better than an accidental "writeable" which
7914 * would cause an unwanted block under certain circumstances. For the 1-1
7915 * UDP-style sockets or TCP-style sockets, this code should work.
7918 static int sctp_writeable(struct sock *sk)
7922 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
7928 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
7929 * returns immediately with EINPROGRESS.
7931 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
7933 struct sock *sk = asoc->base.sk;
7935 long current_timeo = *timeo_p;
7938 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
7940 /* Increment the association's refcnt. */
7941 sctp_association_hold(asoc);
7944 prepare_to_wait_exclusive(&asoc->wait, &wait,
7945 TASK_INTERRUPTIBLE);
7948 if (sk->sk_shutdown & RCV_SHUTDOWN)
7950 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
7953 if (signal_pending(current))
7954 goto do_interrupted;
7956 if (sctp_state(asoc, ESTABLISHED))
7959 /* Let another process have a go. Since we are going
7963 current_timeo = schedule_timeout(current_timeo);
7966 *timeo_p = current_timeo;
7970 finish_wait(&asoc->wait, &wait);
7972 /* Release the association's refcnt. */
7973 sctp_association_put(asoc);
7978 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
7981 err = -ECONNREFUSED;
7985 err = sock_intr_errno(*timeo_p);
7993 static int sctp_wait_for_accept(struct sock *sk, long timeo)
7995 struct sctp_endpoint *ep;
7999 ep = sctp_sk(sk)->ep;
8003 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8004 TASK_INTERRUPTIBLE);
8006 if (list_empty(&ep->asocs)) {
8008 timeo = schedule_timeout(timeo);
8013 if (!sctp_sstate(sk, LISTENING))
8017 if (!list_empty(&ep->asocs))
8020 err = sock_intr_errno(timeo);
8021 if (signal_pending(current))
8029 finish_wait(sk_sleep(sk), &wait);
8034 static void sctp_wait_for_close(struct sock *sk, long timeout)
8039 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8040 if (list_empty(&sctp_sk(sk)->ep->asocs))
8043 timeout = schedule_timeout(timeout);
8045 } while (!signal_pending(current) && timeout);
8047 finish_wait(sk_sleep(sk), &wait);
8050 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8052 struct sk_buff *frag;
8057 /* Don't forget the fragments. */
8058 skb_walk_frags(skb, frag)
8059 sctp_skb_set_owner_r_frag(frag, sk);
8062 sctp_skb_set_owner_r(skb, sk);
8065 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8066 struct sctp_association *asoc)
8068 struct inet_sock *inet = inet_sk(sk);
8069 struct inet_sock *newinet;
8071 newsk->sk_type = sk->sk_type;
8072 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8073 newsk->sk_flags = sk->sk_flags;
8074 newsk->sk_tsflags = sk->sk_tsflags;
8075 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8076 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8077 newsk->sk_reuse = sk->sk_reuse;
8079 newsk->sk_shutdown = sk->sk_shutdown;
8080 newsk->sk_destruct = sctp_destruct_sock;
8081 newsk->sk_family = sk->sk_family;
8082 newsk->sk_protocol = IPPROTO_SCTP;
8083 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8084 newsk->sk_sndbuf = sk->sk_sndbuf;
8085 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8086 newsk->sk_lingertime = sk->sk_lingertime;
8087 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8088 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8089 newsk->sk_rxhash = sk->sk_rxhash;
8091 newinet = inet_sk(newsk);
8093 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8094 * getsockname() and getpeername()
8096 newinet->inet_sport = inet->inet_sport;
8097 newinet->inet_saddr = inet->inet_saddr;
8098 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8099 newinet->inet_dport = htons(asoc->peer.port);
8100 newinet->pmtudisc = inet->pmtudisc;
8101 newinet->inet_id = asoc->next_tsn ^ jiffies;
8103 newinet->uc_ttl = inet->uc_ttl;
8104 newinet->mc_loop = 1;
8105 newinet->mc_ttl = 1;
8106 newinet->mc_index = 0;
8107 newinet->mc_list = NULL;
8109 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8110 net_enable_timestamp();
8112 security_sk_clone(sk, newsk);
8115 static inline void sctp_copy_descendant(struct sock *sk_to,
8116 const struct sock *sk_from)
8118 int ancestor_size = sizeof(struct inet_sock) +
8119 sizeof(struct sctp_sock) -
8120 offsetof(struct sctp_sock, auto_asconf_list);
8122 if (sk_from->sk_family == PF_INET6)
8123 ancestor_size += sizeof(struct ipv6_pinfo);
8125 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8128 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8129 * and its messages to the newsk.
8131 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8132 struct sctp_association *assoc,
8133 enum sctp_socket_type type)
8135 struct sctp_sock *oldsp = sctp_sk(oldsk);
8136 struct sctp_sock *newsp = sctp_sk(newsk);
8137 struct sctp_bind_bucket *pp; /* hash list port iterator */
8138 struct sctp_endpoint *newep = newsp->ep;
8139 struct sk_buff *skb, *tmp;
8140 struct sctp_ulpevent *event;
8141 struct sctp_bind_hashbucket *head;
8143 /* Migrate socket buffer sizes and all the socket level options to the
8146 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8147 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8148 /* Brute force copy old sctp opt. */
8149 sctp_copy_descendant(newsk, oldsk);
8151 /* Restore the ep value that was overwritten with the above structure
8157 /* Hook this new socket in to the bind_hash list. */
8158 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8159 inet_sk(oldsk)->inet_num)];
8160 spin_lock_bh(&head->lock);
8161 pp = sctp_sk(oldsk)->bind_hash;
8162 sk_add_bind_node(newsk, &pp->owner);
8163 sctp_sk(newsk)->bind_hash = pp;
8164 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8165 spin_unlock_bh(&head->lock);
8167 /* Copy the bind_addr list from the original endpoint to the new
8168 * endpoint so that we can handle restarts properly
8170 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8171 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8173 /* Move any messages in the old socket's receive queue that are for the
8174 * peeled off association to the new socket's receive queue.
8176 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8177 event = sctp_skb2event(skb);
8178 if (event->asoc == assoc) {
8179 __skb_unlink(skb, &oldsk->sk_receive_queue);
8180 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8181 sctp_skb_set_owner_r_frag(skb, newsk);
8185 /* Clean up any messages pending delivery due to partial
8186 * delivery. Three cases:
8187 * 1) No partial deliver; no work.
8188 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8189 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8191 skb_queue_head_init(&newsp->pd_lobby);
8192 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8194 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8195 struct sk_buff_head *queue;
8197 /* Decide which queue to move pd_lobby skbs to. */
8198 if (assoc->ulpq.pd_mode) {
8199 queue = &newsp->pd_lobby;
8201 queue = &newsk->sk_receive_queue;
8203 /* Walk through the pd_lobby, looking for skbs that
8204 * need moved to the new socket.
8206 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8207 event = sctp_skb2event(skb);
8208 if (event->asoc == assoc) {
8209 __skb_unlink(skb, &oldsp->pd_lobby);
8210 __skb_queue_tail(queue, skb);
8211 sctp_skb_set_owner_r_frag(skb, newsk);
8215 /* Clear up any skbs waiting for the partial
8216 * delivery to finish.
8218 if (assoc->ulpq.pd_mode)
8219 sctp_clear_pd(oldsk, NULL);
8223 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
8224 sctp_skb_set_owner_r_frag(skb, newsk);
8226 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
8227 sctp_skb_set_owner_r_frag(skb, newsk);
8229 /* Set the type of socket to indicate that it is peeled off from the
8230 * original UDP-style socket or created with the accept() call on a
8231 * TCP-style socket..
8235 /* Mark the new socket "in-use" by the user so that any packets
8236 * that may arrive on the association after we've moved it are
8237 * queued to the backlog. This prevents a potential race between
8238 * backlog processing on the old socket and new-packet processing
8239 * on the new socket.
8241 * The caller has just allocated newsk so we can guarantee that other
8242 * paths won't try to lock it and then oldsk.
8244 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8245 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
8246 sctp_assoc_migrate(assoc, newsk);
8247 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
8249 /* If the association on the newsk is already closed before accept()
8250 * is called, set RCV_SHUTDOWN flag.
8252 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8253 newsk->sk_state = SCTP_SS_CLOSED;
8254 newsk->sk_shutdown |= RCV_SHUTDOWN;
8256 newsk->sk_state = SCTP_SS_ESTABLISHED;
8259 release_sock(newsk);
8263 /* This proto struct describes the ULP interface for SCTP. */
8264 struct proto sctp_prot = {
8266 .owner = THIS_MODULE,
8267 .close = sctp_close,
8268 .connect = sctp_connect,
8269 .disconnect = sctp_disconnect,
8270 .accept = sctp_accept,
8271 .ioctl = sctp_ioctl,
8272 .init = sctp_init_sock,
8273 .destroy = sctp_destroy_sock,
8274 .shutdown = sctp_shutdown,
8275 .setsockopt = sctp_setsockopt,
8276 .getsockopt = sctp_getsockopt,
8277 .sendmsg = sctp_sendmsg,
8278 .recvmsg = sctp_recvmsg,
8280 .backlog_rcv = sctp_backlog_rcv,
8282 .unhash = sctp_unhash,
8283 .get_port = sctp_get_port,
8284 .obj_size = sizeof(struct sctp_sock),
8285 .sysctl_mem = sysctl_sctp_mem,
8286 .sysctl_rmem = sysctl_sctp_rmem,
8287 .sysctl_wmem = sysctl_sctp_wmem,
8288 .memory_pressure = &sctp_memory_pressure,
8289 .enter_memory_pressure = sctp_enter_memory_pressure,
8290 .memory_allocated = &sctp_memory_allocated,
8291 .sockets_allocated = &sctp_sockets_allocated,
8294 #if IS_ENABLED(CONFIG_IPV6)
8296 #include <net/transp_v6.h>
8297 static void sctp_v6_destroy_sock(struct sock *sk)
8299 sctp_destroy_sock(sk);
8300 inet6_destroy_sock(sk);
8303 struct proto sctpv6_prot = {
8305 .owner = THIS_MODULE,
8306 .close = sctp_close,
8307 .connect = sctp_connect,
8308 .disconnect = sctp_disconnect,
8309 .accept = sctp_accept,
8310 .ioctl = sctp_ioctl,
8311 .init = sctp_init_sock,
8312 .destroy = sctp_v6_destroy_sock,
8313 .shutdown = sctp_shutdown,
8314 .setsockopt = sctp_setsockopt,
8315 .getsockopt = sctp_getsockopt,
8316 .sendmsg = sctp_sendmsg,
8317 .recvmsg = sctp_recvmsg,
8319 .backlog_rcv = sctp_backlog_rcv,
8321 .unhash = sctp_unhash,
8322 .get_port = sctp_get_port,
8323 .obj_size = sizeof(struct sctp6_sock),
8324 .sysctl_mem = sysctl_sctp_mem,
8325 .sysctl_rmem = sysctl_sctp_rmem,
8326 .sysctl_wmem = sysctl_sctp_wmem,
8327 .memory_pressure = &sctp_memory_pressure,
8328 .enter_memory_pressure = sctp_enter_memory_pressure,
8329 .memory_allocated = &sctp_memory_allocated,
8330 .sockets_allocated = &sctp_sockets_allocated,
8332 #endif /* IS_ENABLED(CONFIG_IPV6) */