1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
10 * This file is part of the SCTP kernel implementation
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
19 * Please send any bug reports or fixes you make to the
21 * lksctp developers <linux-sctp@vger.kernel.org>
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
58 #include <net/route.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
63 #include <linux/socket.h> /* for sa_family_t */
64 #include <linux/export.h>
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
68 #include <net/sctp/stream_sched.h>
70 /* Forward declarations for internal helper functions. */
71 static bool sctp_writeable(struct sock *sk);
72 static void sctp_wfree(struct sk_buff *skb);
73 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
75 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
76 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
77 static int sctp_wait_for_accept(struct sock *sk, long timeo);
78 static void sctp_wait_for_close(struct sock *sk, long timeo);
79 static void sctp_destruct_sock(struct sock *sk);
80 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
81 union sctp_addr *addr, int len);
82 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
83 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
84 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
85 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf(struct sctp_association *asoc,
87 struct sctp_chunk *chunk);
88 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
89 static int sctp_autobind(struct sock *sk);
90 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
91 struct sctp_association *assoc,
92 enum sctp_socket_type type);
94 static unsigned long sctp_memory_pressure;
95 static atomic_long_t sctp_memory_allocated;
96 static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
97 struct percpu_counter sctp_sockets_allocated;
99 static void sctp_enter_memory_pressure(struct sock *sk)
101 sctp_memory_pressure = 1;
105 /* Get the sndbuf space available at the time on the association. */
106 static inline int sctp_wspace(struct sctp_association *asoc)
108 struct sock *sk = asoc->base.sk;
110 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
111 : sk_stream_wspace(sk);
114 /* Increment the used sndbuf space count of the corresponding association by
115 * the size of the outgoing data chunk.
116 * Also, set the skb destructor for sndbuf accounting later.
118 * Since it is always 1-1 between chunk and skb, and also a new skb is always
119 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
120 * destructor in the data chunk skb for the purpose of the sndbuf space
123 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
125 struct sctp_association *asoc = chunk->asoc;
126 struct sock *sk = asoc->base.sk;
128 /* The sndbuf space is tracked per association. */
129 sctp_association_hold(asoc);
132 sctp_auth_shkey_hold(chunk->shkey);
134 skb_set_owner_w(chunk->skb, sk);
136 chunk->skb->destructor = sctp_wfree;
137 /* Save the chunk pointer in skb for sctp_wfree to use later. */
138 skb_shinfo(chunk->skb)->destructor_arg = chunk;
140 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
141 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
143 sk_mem_charge(sk, chunk->skb->truesize);
146 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
148 skb_orphan(chunk->skb);
151 #define traverse_and_process() \
154 if (msg == prev_msg) \
156 list_for_each_entry(c, &msg->chunks, frag_list) { \
157 if ((clear && asoc->base.sk == c->skb->sk) || \
158 (!clear && asoc->base.sk != c->skb->sk)) \
164 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
166 void (*cb)(struct sctp_chunk *))
169 struct sctp_datamsg *msg, *prev_msg = NULL;
170 struct sctp_outq *q = &asoc->outqueue;
171 struct sctp_chunk *chunk, *c;
172 struct sctp_transport *t;
174 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
175 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
176 traverse_and_process();
178 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
179 traverse_and_process();
181 list_for_each_entry(chunk, &q->sacked, transmitted_list)
182 traverse_and_process();
184 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
185 traverse_and_process();
187 list_for_each_entry(chunk, &q->out_chunk_list, list)
188 traverse_and_process();
191 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
192 void (*cb)(struct sk_buff *, struct sock *))
195 struct sk_buff *skb, *tmp;
197 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
200 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
203 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
207 /* Verify that this is a valid address. */
208 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
213 /* Verify basic sockaddr. */
214 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
218 /* Is this a valid SCTP address? */
219 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
222 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
228 /* Look up the association by its id. If this is not a UDP-style
229 * socket, the ID field is always ignored.
231 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
233 struct sctp_association *asoc = NULL;
235 /* If this is not a UDP-style socket, assoc id should be ignored. */
236 if (!sctp_style(sk, UDP)) {
237 /* Return NULL if the socket state is not ESTABLISHED. It
238 * could be a TCP-style listening socket or a socket which
239 * hasn't yet called connect() to establish an association.
241 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
244 /* Get the first and the only association from the list. */
245 if (!list_empty(&sctp_sk(sk)->ep->asocs))
246 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
247 struct sctp_association, asocs);
251 /* Otherwise this is a UDP-style socket. */
252 if (id <= SCTP_ALL_ASSOC)
255 spin_lock_bh(&sctp_assocs_id_lock);
256 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
257 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
259 spin_unlock_bh(&sctp_assocs_id_lock);
264 /* Look up the transport from an address and an assoc id. If both address and
265 * id are specified, the associations matching the address and the id should be
268 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
269 struct sockaddr_storage *addr,
272 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
273 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
274 union sctp_addr *laddr = (union sctp_addr *)addr;
275 struct sctp_transport *transport;
277 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
280 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
287 id_asoc = sctp_id2assoc(sk, id);
288 if (id_asoc && (id_asoc != addr_asoc))
291 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
292 (union sctp_addr *)addr);
297 /* API 3.1.2 bind() - UDP Style Syntax
298 * The syntax of bind() is,
300 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
302 * sd - the socket descriptor returned by socket().
303 * addr - the address structure (struct sockaddr_in or struct
304 * sockaddr_in6 [RFC 2553]),
305 * addr_len - the size of the address structure.
307 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
313 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
316 /* Disallow binding twice. */
317 if (!sctp_sk(sk)->ep->base.bind_addr.port)
318 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
328 static int sctp_get_port_local(struct sock *, union sctp_addr *);
330 /* Verify this is a valid sockaddr. */
331 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
332 union sctp_addr *addr, int len)
336 /* Check minimum size. */
337 if (len < sizeof (struct sockaddr))
340 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
343 if (addr->sa.sa_family == AF_INET6) {
344 if (len < SIN6_LEN_RFC2133)
346 /* V4 mapped address are really of AF_INET family */
347 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
348 !opt->pf->af_supported(AF_INET, opt))
352 /* If we get this far, af is valid. */
353 af = sctp_get_af_specific(addr->sa.sa_family);
355 if (len < af->sockaddr_len)
361 static void sctp_auto_asconf_init(struct sctp_sock *sp)
363 struct net *net = sock_net(&sp->inet.sk);
365 if (net->sctp.default_auto_asconf) {
366 spin_lock(&net->sctp.addr_wq_lock);
367 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
368 spin_unlock(&net->sctp.addr_wq_lock);
369 sp->do_auto_asconf = 1;
373 /* Bind a local address either to an endpoint or to an association. */
374 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
376 struct net *net = sock_net(sk);
377 struct sctp_sock *sp = sctp_sk(sk);
378 struct sctp_endpoint *ep = sp->ep;
379 struct sctp_bind_addr *bp = &ep->base.bind_addr;
384 /* Common sockaddr verification. */
385 af = sctp_sockaddr_af(sp, addr, len);
387 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
388 __func__, sk, addr, len);
392 snum = ntohs(addr->v4.sin_port);
394 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
395 __func__, sk, &addr->sa, bp->port, snum, len);
397 /* PF specific bind() address verification. */
398 if (!sp->pf->bind_verify(sp, addr))
399 return -EADDRNOTAVAIL;
401 /* We must either be unbound, or bind to the same port.
402 * It's OK to allow 0 ports if we are already bound.
403 * We'll just inhert an already bound port in this case
408 else if (snum != bp->port) {
409 pr_debug("%s: new port %d doesn't match existing port "
410 "%d\n", __func__, snum, bp->port);
415 if (snum && inet_port_requires_bind_service(net, snum) &&
416 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
419 /* See if the address matches any of the addresses we may have
420 * already bound before checking against other endpoints.
422 if (sctp_bind_addr_match(bp, addr, sp))
425 /* Make sure we are allowed to bind here.
426 * The function sctp_get_port_local() does duplicate address
429 addr->v4.sin_port = htons(snum);
430 if (sctp_get_port_local(sk, addr))
433 /* Refresh ephemeral port. */
435 bp->port = inet_sk(sk)->inet_num;
436 sctp_auto_asconf_init(sp);
439 /* Add the address to the bind address list.
440 * Use GFP_ATOMIC since BHs will be disabled.
442 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
443 SCTP_ADDR_SRC, GFP_ATOMIC);
449 /* Copy back into socket for getsockname() use. */
450 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
451 sp->pf->to_sk_saddr(addr, sk);
456 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
458 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
459 * at any one time. If a sender, after sending an ASCONF chunk, decides
460 * it needs to transfer another ASCONF Chunk, it MUST wait until the
461 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
462 * subsequent ASCONF. Note this restriction binds each side, so at any
463 * time two ASCONF may be in-transit on any given association (one sent
464 * from each endpoint).
466 static int sctp_send_asconf(struct sctp_association *asoc,
467 struct sctp_chunk *chunk)
471 /* If there is an outstanding ASCONF chunk, queue it for later
474 if (asoc->addip_last_asconf) {
475 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
479 /* Hold the chunk until an ASCONF_ACK is received. */
480 sctp_chunk_hold(chunk);
481 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
483 sctp_chunk_free(chunk);
485 asoc->addip_last_asconf = chunk;
491 /* Add a list of addresses as bind addresses to local endpoint or
494 * Basically run through each address specified in the addrs/addrcnt
495 * array/length pair, determine if it is IPv6 or IPv4 and call
496 * sctp_do_bind() on it.
498 * If any of them fails, then the operation will be reversed and the
499 * ones that were added will be removed.
501 * Only sctp_setsockopt_bindx() is supposed to call this function.
503 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
508 struct sockaddr *sa_addr;
511 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
515 for (cnt = 0; cnt < addrcnt; cnt++) {
516 /* The list may contain either IPv4 or IPv6 address;
517 * determine the address length for walking thru the list.
520 af = sctp_get_af_specific(sa_addr->sa_family);
526 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
529 addr_buf += af->sockaddr_len;
533 /* Failed. Cleanup the ones that have been added */
535 sctp_bindx_rem(sk, addrs, cnt);
543 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
544 * associations that are part of the endpoint indicating that a list of local
545 * addresses are added to the endpoint.
547 * If any of the addresses is already in the bind address list of the
548 * association, we do not send the chunk for that association. But it will not
549 * affect other associations.
551 * Only sctp_setsockopt_bindx() is supposed to call this function.
553 static int sctp_send_asconf_add_ip(struct sock *sk,
554 struct sockaddr *addrs,
557 struct sctp_sock *sp;
558 struct sctp_endpoint *ep;
559 struct sctp_association *asoc;
560 struct sctp_bind_addr *bp;
561 struct sctp_chunk *chunk;
562 struct sctp_sockaddr_entry *laddr;
563 union sctp_addr *addr;
564 union sctp_addr saveaddr;
574 if (!ep->asconf_enable)
577 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
578 __func__, sk, addrs, addrcnt);
580 list_for_each_entry(asoc, &ep->asocs, asocs) {
581 if (!asoc->peer.asconf_capable)
584 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
587 if (!sctp_state(asoc, ESTABLISHED))
590 /* Check if any address in the packed array of addresses is
591 * in the bind address list of the association. If so,
592 * do not send the asconf chunk to its peer, but continue with
593 * other associations.
596 for (i = 0; i < addrcnt; i++) {
598 af = sctp_get_af_specific(addr->v4.sin_family);
604 if (sctp_assoc_lookup_laddr(asoc, addr))
607 addr_buf += af->sockaddr_len;
612 /* Use the first valid address in bind addr list of
613 * association as Address Parameter of ASCONF CHUNK.
615 bp = &asoc->base.bind_addr;
616 p = bp->address_list.next;
617 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
618 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
619 addrcnt, SCTP_PARAM_ADD_IP);
625 /* Add the new addresses to the bind address list with
626 * use_as_src set to 0.
629 for (i = 0; i < addrcnt; i++) {
631 af = sctp_get_af_specific(addr->v4.sin_family);
632 memcpy(&saveaddr, addr, af->sockaddr_len);
633 retval = sctp_add_bind_addr(bp, &saveaddr,
635 SCTP_ADDR_NEW, GFP_ATOMIC);
636 addr_buf += af->sockaddr_len;
638 if (asoc->src_out_of_asoc_ok) {
639 struct sctp_transport *trans;
641 list_for_each_entry(trans,
642 &asoc->peer.transport_addr_list, transports) {
643 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
644 2*asoc->pathmtu, 4380));
645 trans->ssthresh = asoc->peer.i.a_rwnd;
646 trans->rto = asoc->rto_initial;
647 sctp_max_rto(asoc, trans);
648 trans->rtt = trans->srtt = trans->rttvar = 0;
649 /* Clear the source and route cache */
650 sctp_transport_route(trans, NULL,
651 sctp_sk(asoc->base.sk));
654 retval = sctp_send_asconf(asoc, chunk);
661 /* Remove a list of addresses from bind addresses list. Do not remove the
664 * Basically run through each address specified in the addrs/addrcnt
665 * array/length pair, determine if it is IPv6 or IPv4 and call
666 * sctp_del_bind() on it.
668 * If any of them fails, then the operation will be reversed and the
669 * ones that were removed will be added back.
671 * At least one address has to be left; if only one address is
672 * available, the operation will return -EBUSY.
674 * Only sctp_setsockopt_bindx() is supposed to call this function.
676 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
678 struct sctp_sock *sp = sctp_sk(sk);
679 struct sctp_endpoint *ep = sp->ep;
681 struct sctp_bind_addr *bp = &ep->base.bind_addr;
684 union sctp_addr *sa_addr;
687 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
688 __func__, sk, addrs, addrcnt);
691 for (cnt = 0; cnt < addrcnt; cnt++) {
692 /* If the bind address list is empty or if there is only one
693 * bind address, there is nothing more to be removed (we need
694 * at least one address here).
696 if (list_empty(&bp->address_list) ||
697 (sctp_list_single_entry(&bp->address_list))) {
703 af = sctp_get_af_specific(sa_addr->sa.sa_family);
709 if (!af->addr_valid(sa_addr, sp, NULL)) {
710 retval = -EADDRNOTAVAIL;
714 if (sa_addr->v4.sin_port &&
715 sa_addr->v4.sin_port != htons(bp->port)) {
720 if (!sa_addr->v4.sin_port)
721 sa_addr->v4.sin_port = htons(bp->port);
723 /* FIXME - There is probably a need to check if sk->sk_saddr and
724 * sk->sk_rcv_addr are currently set to one of the addresses to
725 * be removed. This is something which needs to be looked into
726 * when we are fixing the outstanding issues with multi-homing
727 * socket routing and failover schemes. Refer to comments in
728 * sctp_do_bind(). -daisy
730 retval = sctp_del_bind_addr(bp, sa_addr);
732 addr_buf += af->sockaddr_len;
735 /* Failed. Add the ones that has been removed back */
737 sctp_bindx_add(sk, addrs, cnt);
745 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
746 * the associations that are part of the endpoint indicating that a list of
747 * local addresses are removed from the endpoint.
749 * If any of the addresses is already in the bind address list of the
750 * association, we do not send the chunk for that association. But it will not
751 * affect other associations.
753 * Only sctp_setsockopt_bindx() is supposed to call this function.
755 static int sctp_send_asconf_del_ip(struct sock *sk,
756 struct sockaddr *addrs,
759 struct sctp_sock *sp;
760 struct sctp_endpoint *ep;
761 struct sctp_association *asoc;
762 struct sctp_transport *transport;
763 struct sctp_bind_addr *bp;
764 struct sctp_chunk *chunk;
765 union sctp_addr *laddr;
768 struct sctp_sockaddr_entry *saddr;
777 if (!ep->asconf_enable)
780 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
781 __func__, sk, addrs, addrcnt);
783 list_for_each_entry(asoc, &ep->asocs, asocs) {
785 if (!asoc->peer.asconf_capable)
788 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791 if (!sctp_state(asoc, ESTABLISHED))
794 /* Check if any address in the packed array of addresses is
795 * not present in the bind address list of the association.
796 * If so, do not send the asconf chunk to its peer, but
797 * continue with other associations.
800 for (i = 0; i < addrcnt; i++) {
802 af = sctp_get_af_specific(laddr->v4.sin_family);
808 if (!sctp_assoc_lookup_laddr(asoc, laddr))
811 addr_buf += af->sockaddr_len;
816 /* Find one address in the association's bind address list
817 * that is not in the packed array of addresses. This is to
818 * make sure that we do not delete all the addresses in the
821 bp = &asoc->base.bind_addr;
822 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
824 if ((laddr == NULL) && (addrcnt == 1)) {
825 if (asoc->asconf_addr_del_pending)
827 asoc->asconf_addr_del_pending =
828 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
829 if (asoc->asconf_addr_del_pending == NULL) {
833 asoc->asconf_addr_del_pending->sa.sa_family =
835 asoc->asconf_addr_del_pending->v4.sin_port =
837 if (addrs->sa_family == AF_INET) {
838 struct sockaddr_in *sin;
840 sin = (struct sockaddr_in *)addrs;
841 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
842 } else if (addrs->sa_family == AF_INET6) {
843 struct sockaddr_in6 *sin6;
845 sin6 = (struct sockaddr_in6 *)addrs;
846 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
850 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
851 asoc->asconf_addr_del_pending);
853 asoc->src_out_of_asoc_ok = 1;
861 /* We do not need RCU protection throughout this loop
862 * because this is done under a socket lock from the
865 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
873 /* Reset use_as_src flag for the addresses in the bind address
874 * list that are to be deleted.
877 for (i = 0; i < addrcnt; i++) {
879 af = sctp_get_af_specific(laddr->v4.sin_family);
880 list_for_each_entry(saddr, &bp->address_list, list) {
881 if (sctp_cmp_addr_exact(&saddr->a, laddr))
882 saddr->state = SCTP_ADDR_DEL;
884 addr_buf += af->sockaddr_len;
887 /* Update the route and saddr entries for all the transports
888 * as some of the addresses in the bind address list are
889 * about to be deleted and cannot be used as source addresses.
891 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
893 sctp_transport_route(transport, NULL,
894 sctp_sk(asoc->base.sk));
898 /* We don't need to transmit ASCONF */
900 retval = sctp_send_asconf(asoc, chunk);
906 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
907 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
909 struct sock *sk = sctp_opt2sk(sp);
910 union sctp_addr *addr;
913 /* It is safe to write port space in caller. */
915 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
916 af = sctp_get_af_specific(addr->sa.sa_family);
919 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
922 if (addrw->state == SCTP_ADDR_NEW)
923 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
925 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
928 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
931 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
934 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
935 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
938 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
939 * Section 3.1.2 for this usage.
941 * addrs is a pointer to an array of one or more socket addresses. Each
942 * address is contained in its appropriate structure (i.e. struct
943 * sockaddr_in or struct sockaddr_in6) the family of the address type
944 * must be used to distinguish the address length (note that this
945 * representation is termed a "packed array" of addresses). The caller
946 * specifies the number of addresses in the array with addrcnt.
948 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
949 * -1, and sets errno to the appropriate error code.
951 * For SCTP, the port given in each socket address must be the same, or
952 * sctp_bindx() will fail, setting errno to EINVAL.
954 * The flags parameter is formed from the bitwise OR of zero or more of
955 * the following currently defined flags:
957 * SCTP_BINDX_ADD_ADDR
959 * SCTP_BINDX_REM_ADDR
961 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
962 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
963 * addresses from the association. The two flags are mutually exclusive;
964 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
965 * not remove all addresses from an association; sctp_bindx() will
966 * reject such an attempt with EINVAL.
968 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
969 * additional addresses with an endpoint after calling bind(). Or use
970 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
971 * socket is associated with so that no new association accepted will be
972 * associated with those addresses. If the endpoint supports dynamic
973 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
974 * endpoint to send the appropriate message to the peer to change the
975 * peers address lists.
977 * Adding and removing addresses from a connected association is
978 * optional functionality. Implementations that do not support this
979 * functionality should return EOPNOTSUPP.
981 * Basically do nothing but copying the addresses from user to kernel
982 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
983 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
986 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
989 * sk The sk of the socket
990 * addrs The pointer to the addresses
991 * addrssize Size of the addrs buffer
992 * op Operation to perform (add or remove, see the flags of
995 * Returns 0 if ok, <0 errno code on error.
997 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
998 int addrs_size, int op)
1003 struct sockaddr *sa_addr;
1004 void *addr_buf = addrs;
1007 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1008 __func__, sk, addr_buf, addrs_size, op);
1010 if (unlikely(addrs_size <= 0))
1013 /* Walk through the addrs buffer and count the number of addresses. */
1014 while (walk_size < addrs_size) {
1015 if (walk_size + sizeof(sa_family_t) > addrs_size)
1019 af = sctp_get_af_specific(sa_addr->sa_family);
1021 /* If the address family is not supported or if this address
1022 * causes the address buffer to overflow return EINVAL.
1024 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1027 addr_buf += af->sockaddr_len;
1028 walk_size += af->sockaddr_len;
1033 case SCTP_BINDX_ADD_ADDR:
1034 /* Allow security module to validate bindx addresses. */
1035 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1039 err = sctp_bindx_add(sk, addrs, addrcnt);
1042 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1043 case SCTP_BINDX_REM_ADDR:
1044 err = sctp_bindx_rem(sk, addrs, addrcnt);
1047 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1054 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1060 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1065 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1066 const union sctp_addr *daddr,
1067 const struct sctp_initmsg *init,
1068 struct sctp_transport **tp)
1070 struct sctp_association *asoc;
1071 struct sock *sk = ep->base.sk;
1072 struct net *net = sock_net(sk);
1073 enum sctp_scope scope;
1076 if (sctp_endpoint_is_peeled_off(ep, daddr))
1077 return -EADDRNOTAVAIL;
1079 if (!ep->base.bind_addr.port) {
1080 if (sctp_autobind(sk))
1083 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1084 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1088 scope = sctp_scope(daddr);
1089 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1093 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1097 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1106 if (init->sinit_num_ostreams) {
1107 __u16 outcnt = init->sinit_num_ostreams;
1109 asoc->c.sinit_num_ostreams = outcnt;
1110 /* outcnt has been changed, need to re-init stream */
1111 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1116 if (init->sinit_max_instreams)
1117 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1119 if (init->sinit_max_attempts)
1120 asoc->max_init_attempts = init->sinit_max_attempts;
1122 if (init->sinit_max_init_timeo)
1123 asoc->max_init_timeo =
1124 msecs_to_jiffies(init->sinit_max_init_timeo);
1128 sctp_association_free(asoc);
1132 static int sctp_connect_add_peer(struct sctp_association *asoc,
1133 union sctp_addr *daddr, int addr_len)
1135 struct sctp_endpoint *ep = asoc->ep;
1136 struct sctp_association *old;
1137 struct sctp_transport *t;
1140 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1144 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1145 if (old && old != asoc)
1146 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1149 if (sctp_endpoint_is_peeled_off(ep, daddr))
1150 return -EADDRNOTAVAIL;
1152 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1159 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1161 * Common routine for handling connect() and sctp_connectx().
1162 * Connect will come in with just a single address.
1164 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1165 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1167 struct sctp_sock *sp = sctp_sk(sk);
1168 struct sctp_endpoint *ep = sp->ep;
1169 struct sctp_transport *transport;
1170 struct sctp_association *asoc;
1171 void *addr_buf = kaddrs;
1172 union sctp_addr *daddr;
1177 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1178 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1182 af = sctp_get_af_specific(daddr->sa.sa_family);
1183 if (!af || af->sockaddr_len > addrs_size)
1186 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1190 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1192 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1195 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1198 asoc = transport->asoc;
1200 addr_buf += af->sockaddr_len;
1201 walk_size = af->sockaddr_len;
1202 while (walk_size < addrs_size) {
1204 if (walk_size + sizeof(sa_family_t) > addrs_size)
1208 af = sctp_get_af_specific(daddr->sa.sa_family);
1209 if (!af || af->sockaddr_len + walk_size > addrs_size)
1212 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1215 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1219 addr_buf += af->sockaddr_len;
1220 walk_size += af->sockaddr_len;
1223 /* In case the user of sctp_connectx() wants an association
1224 * id back, assign one now.
1227 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1232 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1236 /* Initialize sk's dport and daddr for getpeername() */
1237 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1238 sp->pf->to_sk_daddr(daddr, sk);
1242 *assoc_id = asoc->assoc_id;
1244 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1245 return sctp_wait_for_connect(asoc, &timeo);
1248 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1249 __func__, asoc, kaddrs, err);
1250 sctp_association_free(asoc);
1254 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1257 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1258 * sctp_assoc_t *asoc);
1260 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1261 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1262 * or IPv6 addresses.
1264 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1265 * Section 3.1.2 for this usage.
1267 * addrs is a pointer to an array of one or more socket addresses. Each
1268 * address is contained in its appropriate structure (i.e. struct
1269 * sockaddr_in or struct sockaddr_in6) the family of the address type
1270 * must be used to distengish the address length (note that this
1271 * representation is termed a "packed array" of addresses). The caller
1272 * specifies the number of addresses in the array with addrcnt.
1274 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1275 * the association id of the new association. On failure, sctp_connectx()
1276 * returns -1, and sets errno to the appropriate error code. The assoc_id
1277 * is not touched by the kernel.
1279 * For SCTP, the port given in each socket address must be the same, or
1280 * sctp_connectx() will fail, setting errno to EINVAL.
1282 * An application can use sctp_connectx to initiate an association with
1283 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1284 * allows a caller to specify multiple addresses at which a peer can be
1285 * reached. The way the SCTP stack uses the list of addresses to set up
1286 * the association is implementation dependent. This function only
1287 * specifies that the stack will try to make use of all the addresses in
1288 * the list when needed.
1290 * Note that the list of addresses passed in is only used for setting up
1291 * the association. It does not necessarily equal the set of addresses
1292 * the peer uses for the resulting association. If the caller wants to
1293 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1294 * retrieve them after the association has been set up.
1296 * Basically do nothing but copying the addresses from user to kernel
1297 * land and invoking either sctp_connectx(). This is used for tunneling
1298 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1300 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303 * sk The sk of the socket
1304 * addrs The pointer to the addresses
1305 * addrssize Size of the addrs buffer
1307 * Returns >=0 if ok, <0 errno code on error.
1309 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1310 int addrs_size, sctp_assoc_t *assoc_id)
1312 int err = 0, flags = 0;
1314 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1315 __func__, sk, kaddrs, addrs_size);
1317 /* make sure the 1st addr's sa_family is accessible later */
1318 if (unlikely(addrs_size < sizeof(sa_family_t)))
1321 /* Allow security module to validate connectx addresses. */
1322 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1323 (struct sockaddr *)kaddrs,
1328 /* in-kernel sockets don't generally have a file allocated to them
1329 * if all they do is call sock_create_kern().
1331 if (sk->sk_socket->file)
1332 flags = sk->sk_socket->file->f_flags;
1334 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1338 * This is an older interface. It's kept for backward compatibility
1339 * to the option that doesn't provide association id.
1341 static int sctp_setsockopt_connectx_old(struct sock *sk,
1342 struct sockaddr *kaddrs,
1345 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1349 * New interface for the API. The since the API is done with a socket
1350 * option, to make it simple we feed back the association id is as a return
1351 * indication to the call. Error is always negative and association id is
1354 static int sctp_setsockopt_connectx(struct sock *sk,
1355 struct sockaddr *kaddrs,
1358 sctp_assoc_t assoc_id = 0;
1361 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1370 * New (hopefully final) interface for the API.
1371 * We use the sctp_getaddrs_old structure so that use-space library
1372 * can avoid any unnecessary allocations. The only different part
1373 * is that we store the actual length of the address buffer into the
1374 * addrs_num structure member. That way we can re-use the existing
1377 #ifdef CONFIG_COMPAT
1378 struct compat_sctp_getaddrs_old {
1379 sctp_assoc_t assoc_id;
1381 compat_uptr_t addrs; /* struct sockaddr * */
1385 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1386 char __user *optval,
1389 struct sctp_getaddrs_old param;
1390 sctp_assoc_t assoc_id = 0;
1391 struct sockaddr *kaddrs;
1394 #ifdef CONFIG_COMPAT
1395 if (in_compat_syscall()) {
1396 struct compat_sctp_getaddrs_old param32;
1398 if (len < sizeof(param32))
1400 if (copy_from_user(¶m32, optval, sizeof(param32)))
1403 param.assoc_id = param32.assoc_id;
1404 param.addr_num = param32.addr_num;
1405 param.addrs = compat_ptr(param32.addrs);
1409 if (len < sizeof(param))
1411 if (copy_from_user(¶m, optval, sizeof(param)))
1415 kaddrs = memdup_user(param.addrs, param.addr_num);
1417 return PTR_ERR(kaddrs);
1419 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1421 if (err == 0 || err == -EINPROGRESS) {
1422 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1424 if (put_user(sizeof(assoc_id), optlen))
1431 /* API 3.1.4 close() - UDP Style Syntax
1432 * Applications use close() to perform graceful shutdown (as described in
1433 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1434 * by a UDP-style socket.
1438 * ret = close(int sd);
1440 * sd - the socket descriptor of the associations to be closed.
1442 * To gracefully shutdown a specific association represented by the
1443 * UDP-style socket, an application should use the sendmsg() call,
1444 * passing no user data, but including the appropriate flag in the
1445 * ancillary data (see Section xxxx).
1447 * If sd in the close() call is a branched-off socket representing only
1448 * one association, the shutdown is performed on that association only.
1450 * 4.1.6 close() - TCP Style Syntax
1452 * Applications use close() to gracefully close down an association.
1456 * int close(int sd);
1458 * sd - the socket descriptor of the association to be closed.
1460 * After an application calls close() on a socket descriptor, no further
1461 * socket operations will succeed on that descriptor.
1463 * API 7.1.4 SO_LINGER
1465 * An application using the TCP-style socket can use this option to
1466 * perform the SCTP ABORT primitive. The linger option structure is:
1469 * int l_onoff; // option on/off
1470 * int l_linger; // linger time
1473 * To enable the option, set l_onoff to 1. If the l_linger value is set
1474 * to 0, calling close() is the same as the ABORT primitive. If the
1475 * value is set to a negative value, the setsockopt() call will return
1476 * an error. If the value is set to a positive value linger_time, the
1477 * close() can be blocked for at most linger_time ms. If the graceful
1478 * shutdown phase does not finish during this period, close() will
1479 * return but the graceful shutdown phase continues in the system.
1481 static void sctp_close(struct sock *sk, long timeout)
1483 struct net *net = sock_net(sk);
1484 struct sctp_endpoint *ep;
1485 struct sctp_association *asoc;
1486 struct list_head *pos, *temp;
1487 unsigned int data_was_unread;
1489 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1491 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1492 sk->sk_shutdown = SHUTDOWN_MASK;
1493 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1495 ep = sctp_sk(sk)->ep;
1497 /* Clean up any skbs sitting on the receive queue. */
1498 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1499 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1501 /* Walk all associations on an endpoint. */
1502 list_for_each_safe(pos, temp, &ep->asocs) {
1503 asoc = list_entry(pos, struct sctp_association, asocs);
1505 if (sctp_style(sk, TCP)) {
1506 /* A closed association can still be in the list if
1507 * it belongs to a TCP-style listening socket that is
1508 * not yet accepted. If so, free it. If not, send an
1509 * ABORT or SHUTDOWN based on the linger options.
1511 if (sctp_state(asoc, CLOSED)) {
1512 sctp_association_free(asoc);
1517 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1518 !skb_queue_empty(&asoc->ulpq.reasm) ||
1519 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1520 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1521 struct sctp_chunk *chunk;
1523 chunk = sctp_make_abort_user(asoc, NULL, 0);
1524 sctp_primitive_ABORT(net, asoc, chunk);
1526 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1529 /* On a TCP-style socket, block for at most linger_time if set. */
1530 if (sctp_style(sk, TCP) && timeout)
1531 sctp_wait_for_close(sk, timeout);
1533 /* This will run the backlog queue. */
1536 /* Supposedly, no process has access to the socket, but
1537 * the net layers still may.
1538 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1539 * held and that should be grabbed before socket lock.
1541 spin_lock_bh(&net->sctp.addr_wq_lock);
1542 bh_lock_sock_nested(sk);
1544 /* Hold the sock, since sk_common_release() will put sock_put()
1545 * and we have just a little more cleanup.
1548 sk_common_release(sk);
1551 spin_unlock_bh(&net->sctp.addr_wq_lock);
1555 SCTP_DBG_OBJCNT_DEC(sock);
1558 /* Handle EPIPE error. */
1559 static int sctp_error(struct sock *sk, int flags, int err)
1562 err = sock_error(sk) ? : -EPIPE;
1563 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1564 send_sig(SIGPIPE, current, 0);
1568 /* API 3.1.3 sendmsg() - UDP Style Syntax
1570 * An application uses sendmsg() and recvmsg() calls to transmit data to
1571 * and receive data from its peer.
1573 * ssize_t sendmsg(int socket, const struct msghdr *message,
1576 * socket - the socket descriptor of the endpoint.
1577 * message - pointer to the msghdr structure which contains a single
1578 * user message and possibly some ancillary data.
1580 * See Section 5 for complete description of the data
1583 * flags - flags sent or received with the user message, see Section
1584 * 5 for complete description of the flags.
1586 * Note: This function could use a rewrite especially when explicit
1587 * connect support comes in.
1589 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1591 static int sctp_msghdr_parse(const struct msghdr *msg,
1592 struct sctp_cmsgs *cmsgs);
1594 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1595 struct sctp_sndrcvinfo *srinfo,
1596 const struct msghdr *msg, size_t msg_len)
1601 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1604 if (msg_len > sk->sk_sndbuf)
1607 memset(cmsgs, 0, sizeof(*cmsgs));
1608 err = sctp_msghdr_parse(msg, cmsgs);
1610 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1614 memset(srinfo, 0, sizeof(*srinfo));
1615 if (cmsgs->srinfo) {
1616 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1617 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1618 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1619 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1620 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1621 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1625 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1626 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1627 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1628 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1629 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1632 if (cmsgs->prinfo) {
1633 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1634 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1635 cmsgs->prinfo->pr_policy);
1638 sflags = srinfo->sinfo_flags;
1639 if (!sflags && msg_len)
1642 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1645 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1646 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1649 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1655 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1656 struct sctp_cmsgs *cmsgs,
1657 union sctp_addr *daddr,
1658 struct sctp_transport **tp)
1660 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1661 struct sctp_association *asoc;
1662 struct cmsghdr *cmsg;
1663 __be32 flowinfo = 0;
1669 if (sflags & (SCTP_EOF | SCTP_ABORT))
1672 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1673 sctp_sstate(sk, CLOSING)))
1674 return -EADDRNOTAVAIL;
1676 /* Label connection socket for first association 1-to-many
1677 * style for client sequence socket()->sendmsg(). This
1678 * needs to be done before sctp_assoc_add_peer() as that will
1679 * set up the initial packet that needs to account for any
1680 * security ip options (CIPSO/CALIPSO) added to the packet.
1682 af = sctp_get_af_specific(daddr->sa.sa_family);
1685 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1686 (struct sockaddr *)daddr,
1691 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1696 if (!cmsgs->addrs_msg)
1699 if (daddr->sa.sa_family == AF_INET6)
1700 flowinfo = daddr->v6.sin6_flowinfo;
1702 /* sendv addr list parse */
1703 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1704 union sctp_addr _daddr;
1707 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1708 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1709 cmsg->cmsg_type != SCTP_DSTADDRV6))
1713 memset(daddr, 0, sizeof(*daddr));
1714 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1715 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1716 if (dlen < sizeof(struct in_addr)) {
1721 dlen = sizeof(struct in_addr);
1722 daddr->v4.sin_family = AF_INET;
1723 daddr->v4.sin_port = htons(asoc->peer.port);
1724 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1726 if (dlen < sizeof(struct in6_addr)) {
1731 dlen = sizeof(struct in6_addr);
1732 daddr->v6.sin6_flowinfo = flowinfo;
1733 daddr->v6.sin6_family = AF_INET6;
1734 daddr->v6.sin6_port = htons(asoc->peer.port);
1735 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1738 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1746 sctp_association_free(asoc);
1750 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1751 __u16 sflags, struct msghdr *msg,
1754 struct sock *sk = asoc->base.sk;
1755 struct net *net = sock_net(sk);
1757 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1760 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1761 !sctp_state(asoc, ESTABLISHED))
1764 if (sflags & SCTP_EOF) {
1765 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1766 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1771 if (sflags & SCTP_ABORT) {
1772 struct sctp_chunk *chunk;
1774 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1778 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1779 sctp_primitive_ABORT(net, asoc, chunk);
1780 iov_iter_revert(&msg->msg_iter, msg_len);
1788 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1789 struct msghdr *msg, size_t msg_len,
1790 struct sctp_transport *transport,
1791 struct sctp_sndrcvinfo *sinfo)
1793 struct sock *sk = asoc->base.sk;
1794 struct sctp_sock *sp = sctp_sk(sk);
1795 struct net *net = sock_net(sk);
1796 struct sctp_datamsg *datamsg;
1797 bool wait_connect = false;
1798 struct sctp_chunk *chunk;
1802 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1807 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1808 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1813 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1818 if (asoc->pmtu_pending) {
1819 if (sp->param_flags & SPP_PMTUD_ENABLE)
1820 sctp_assoc_sync_pmtu(asoc);
1821 asoc->pmtu_pending = 0;
1824 if (sctp_wspace(asoc) < (int)msg_len)
1825 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1827 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1828 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1829 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1834 if (sctp_state(asoc, CLOSED)) {
1835 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1839 if (asoc->ep->intl_enable) {
1840 timeo = sock_sndtimeo(sk, 0);
1841 err = sctp_wait_for_connect(asoc, &timeo);
1847 wait_connect = true;
1850 pr_debug("%s: we associated primitively\n", __func__);
1853 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1854 if (IS_ERR(datamsg)) {
1855 err = PTR_ERR(datamsg);
1859 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1861 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1862 sctp_chunk_hold(chunk);
1863 sctp_set_owner_w(chunk);
1864 chunk->transport = transport;
1867 err = sctp_primitive_SEND(net, asoc, datamsg);
1869 sctp_datamsg_free(datamsg);
1873 pr_debug("%s: we sent primitively\n", __func__);
1875 sctp_datamsg_put(datamsg);
1877 if (unlikely(wait_connect)) {
1878 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1879 sctp_wait_for_connect(asoc, &timeo);
1888 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1889 const struct msghdr *msg,
1890 struct sctp_cmsgs *cmsgs)
1892 union sctp_addr *daddr = NULL;
1895 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1896 int len = msg->msg_namelen;
1898 if (len > sizeof(*daddr))
1899 len = sizeof(*daddr);
1901 daddr = (union sctp_addr *)msg->msg_name;
1903 err = sctp_verify_addr(sk, daddr, len);
1905 return ERR_PTR(err);
1911 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1912 struct sctp_sndrcvinfo *sinfo,
1913 struct sctp_cmsgs *cmsgs)
1915 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1916 sinfo->sinfo_stream = asoc->default_stream;
1917 sinfo->sinfo_ppid = asoc->default_ppid;
1918 sinfo->sinfo_context = asoc->default_context;
1919 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1922 sinfo->sinfo_flags = asoc->default_flags;
1925 if (!cmsgs->srinfo && !cmsgs->prinfo)
1926 sinfo->sinfo_timetolive = asoc->default_timetolive;
1928 if (cmsgs->authinfo) {
1929 /* Reuse sinfo_tsn to indicate that authinfo was set and
1930 * sinfo_ssn to save the keyid on tx path.
1932 sinfo->sinfo_tsn = 1;
1933 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1937 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1939 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1940 struct sctp_transport *transport = NULL;
1941 struct sctp_sndrcvinfo _sinfo, *sinfo;
1942 struct sctp_association *asoc, *tmp;
1943 struct sctp_cmsgs cmsgs;
1944 union sctp_addr *daddr;
1949 /* Parse and get snd_info */
1950 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1955 sflags = sinfo->sinfo_flags;
1957 /* Get daddr from msg */
1958 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1959 if (IS_ERR(daddr)) {
1960 err = PTR_ERR(daddr);
1966 /* SCTP_SENDALL process */
1967 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1968 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1969 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1976 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1978 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1983 iov_iter_revert(&msg->msg_iter, err);
1989 /* Get and check or create asoc */
1991 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1993 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1998 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2003 asoc = transport->asoc;
2007 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2010 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2016 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2021 /* Update snd_info with the asoc */
2022 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2024 /* Send msg to the asoc */
2025 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2026 if (err < 0 && err != -ESRCH && new)
2027 sctp_association_free(asoc);
2032 return sctp_error(sk, msg->msg_flags, err);
2035 /* This is an extended version of skb_pull() that removes the data from the
2036 * start of a skb even when data is spread across the list of skb's in the
2037 * frag_list. len specifies the total amount of data that needs to be removed.
2038 * when 'len' bytes could be removed from the skb, it returns 0.
2039 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2040 * could not be removed.
2042 static int sctp_skb_pull(struct sk_buff *skb, int len)
2044 struct sk_buff *list;
2045 int skb_len = skb_headlen(skb);
2048 if (len <= skb_len) {
2049 __skb_pull(skb, len);
2053 __skb_pull(skb, skb_len);
2055 skb_walk_frags(skb, list) {
2056 rlen = sctp_skb_pull(list, len);
2057 skb->len -= (len-rlen);
2058 skb->data_len -= (len-rlen);
2069 /* API 3.1.3 recvmsg() - UDP Style Syntax
2071 * ssize_t recvmsg(int socket, struct msghdr *message,
2074 * socket - the socket descriptor of the endpoint.
2075 * message - pointer to the msghdr structure which contains a single
2076 * user message and possibly some ancillary data.
2078 * See Section 5 for complete description of the data
2081 * flags - flags sent or received with the user message, see Section
2082 * 5 for complete description of the flags.
2084 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2085 int flags, int *addr_len)
2087 struct sctp_ulpevent *event = NULL;
2088 struct sctp_sock *sp = sctp_sk(sk);
2089 struct sk_buff *skb, *head_skb;
2094 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2095 __func__, sk, msg, len, flags, addr_len);
2099 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2100 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2105 skb = sctp_skb_recv_datagram(sk, flags, &err);
2109 /* Get the total length of the skb including any skb's in the
2118 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2120 event = sctp_skb2event(skb);
2125 if (event->chunk && event->chunk->head_skb)
2126 head_skb = event->chunk->head_skb;
2129 sock_recv_cmsgs(msg, sk, head_skb);
2130 if (sctp_ulpevent_is_notification(event)) {
2131 msg->msg_flags |= MSG_NOTIFICATION;
2132 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2134 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2137 /* Check if we allow SCTP_NXTINFO. */
2138 if (sp->recvnxtinfo)
2139 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2140 /* Check if we allow SCTP_RCVINFO. */
2141 if (sp->recvrcvinfo)
2142 sctp_ulpevent_read_rcvinfo(event, msg);
2143 /* Check if we allow SCTP_SNDRCVINFO. */
2144 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2145 sctp_ulpevent_read_sndrcvinfo(event, msg);
2149 /* If skb's length exceeds the user's buffer, update the skb and
2150 * push it back to the receive_queue so that the next call to
2151 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2153 if (skb_len > copied) {
2154 msg->msg_flags &= ~MSG_EOR;
2155 if (flags & MSG_PEEK)
2157 sctp_skb_pull(skb, copied);
2158 skb_queue_head(&sk->sk_receive_queue, skb);
2160 /* When only partial message is copied to the user, increase
2161 * rwnd by that amount. If all the data in the skb is read,
2162 * rwnd is updated when the event is freed.
2164 if (!sctp_ulpevent_is_notification(event))
2165 sctp_assoc_rwnd_increase(event->asoc, copied);
2167 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2168 (event->msg_flags & MSG_EOR))
2169 msg->msg_flags |= MSG_EOR;
2171 msg->msg_flags &= ~MSG_EOR;
2174 if (flags & MSG_PEEK) {
2175 /* Release the skb reference acquired after peeking the skb in
2176 * sctp_skb_recv_datagram().
2180 /* Free the event which includes releasing the reference to
2181 * the owner of the skb, freeing the skb and updating the
2184 sctp_ulpevent_free(event);
2191 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2193 * This option is a on/off flag. If enabled no SCTP message
2194 * fragmentation will be performed. Instead if a message being sent
2195 * exceeds the current PMTU size, the message will NOT be sent and
2196 * instead a error will be indicated to the user.
2198 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2199 unsigned int optlen)
2201 if (optlen < sizeof(int))
2203 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2207 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2208 unsigned int optlen)
2210 struct sctp_sock *sp = sctp_sk(sk);
2211 struct sctp_association *asoc;
2214 if (optlen > sizeof(struct sctp_event_subscribe))
2217 for (i = 0; i < optlen; i++)
2218 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2221 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2222 asoc->subscribe = sctp_sk(sk)->subscribe;
2224 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2225 * if there is no data to be sent or retransmit, the stack will
2226 * immediately send up this notification.
2228 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2229 struct sctp_ulpevent *event;
2231 asoc = sctp_id2assoc(sk, 0);
2232 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2233 event = sctp_ulpevent_make_sender_dry_event(asoc,
2234 GFP_USER | __GFP_NOWARN);
2238 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2245 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2247 * This socket option is applicable to the UDP-style socket only. When
2248 * set it will cause associations that are idle for more than the
2249 * specified number of seconds to automatically close. An association
2250 * being idle is defined an association that has NOT sent or received
2251 * user data. The special value of '0' indicates that no automatic
2252 * close of any associations should be performed. The option expects an
2253 * integer defining the number of seconds of idle time before an
2254 * association is closed.
2256 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2257 unsigned int optlen)
2259 struct sctp_sock *sp = sctp_sk(sk);
2260 struct net *net = sock_net(sk);
2262 /* Applicable to UDP-style socket only */
2263 if (sctp_style(sk, TCP))
2265 if (optlen != sizeof(int))
2268 sp->autoclose = *optval;
2269 if (sp->autoclose > net->sctp.max_autoclose)
2270 sp->autoclose = net->sctp.max_autoclose;
2275 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2277 * Applications can enable or disable heartbeats for any peer address of
2278 * an association, modify an address's heartbeat interval, force a
2279 * heartbeat to be sent immediately, and adjust the address's maximum
2280 * number of retransmissions sent before an address is considered
2281 * unreachable. The following structure is used to access and modify an
2282 * address's parameters:
2284 * struct sctp_paddrparams {
2285 * sctp_assoc_t spp_assoc_id;
2286 * struct sockaddr_storage spp_address;
2287 * uint32_t spp_hbinterval;
2288 * uint16_t spp_pathmaxrxt;
2289 * uint32_t spp_pathmtu;
2290 * uint32_t spp_sackdelay;
2291 * uint32_t spp_flags;
2292 * uint32_t spp_ipv6_flowlabel;
2296 * spp_assoc_id - (one-to-many style socket) This is filled in the
2297 * application, and identifies the association for
2299 * spp_address - This specifies which address is of interest.
2300 * spp_hbinterval - This contains the value of the heartbeat interval,
2301 * in milliseconds. If a value of zero
2302 * is present in this field then no changes are to
2303 * be made to this parameter.
2304 * spp_pathmaxrxt - This contains the maximum number of
2305 * retransmissions before this address shall be
2306 * considered unreachable. If a value of zero
2307 * is present in this field then no changes are to
2308 * be made to this parameter.
2309 * spp_pathmtu - When Path MTU discovery is disabled the value
2310 * specified here will be the "fixed" path mtu.
2311 * Note that if the spp_address field is empty
2312 * then all associations on this address will
2313 * have this fixed path mtu set upon them.
2315 * spp_sackdelay - When delayed sack is enabled, this value specifies
2316 * the number of milliseconds that sacks will be delayed
2317 * for. This value will apply to all addresses of an
2318 * association if the spp_address field is empty. Note
2319 * also, that if delayed sack is enabled and this
2320 * value is set to 0, no change is made to the last
2321 * recorded delayed sack timer value.
2323 * spp_flags - These flags are used to control various features
2324 * on an association. The flag field may contain
2325 * zero or more of the following options.
2327 * SPP_HB_ENABLE - Enable heartbeats on the
2328 * specified address. Note that if the address
2329 * field is empty all addresses for the association
2330 * have heartbeats enabled upon them.
2332 * SPP_HB_DISABLE - Disable heartbeats on the
2333 * speicifed address. Note that if the address
2334 * field is empty all addresses for the association
2335 * will have their heartbeats disabled. Note also
2336 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2337 * mutually exclusive, only one of these two should
2338 * be specified. Enabling both fields will have
2339 * undetermined results.
2341 * SPP_HB_DEMAND - Request a user initiated heartbeat
2342 * to be made immediately.
2344 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2345 * heartbeat delayis to be set to the value of 0
2348 * SPP_PMTUD_ENABLE - This field will enable PMTU
2349 * discovery upon the specified address. Note that
2350 * if the address feild is empty then all addresses
2351 * on the association are effected.
2353 * SPP_PMTUD_DISABLE - This field will disable PMTU
2354 * discovery upon the specified address. Note that
2355 * if the address feild is empty then all addresses
2356 * on the association are effected. Not also that
2357 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2358 * exclusive. Enabling both will have undetermined
2361 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2362 * on delayed sack. The time specified in spp_sackdelay
2363 * is used to specify the sack delay for this address. Note
2364 * that if spp_address is empty then all addresses will
2365 * enable delayed sack and take on the sack delay
2366 * value specified in spp_sackdelay.
2367 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2368 * off delayed sack. If the spp_address field is blank then
2369 * delayed sack is disabled for the entire association. Note
2370 * also that this field is mutually exclusive to
2371 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2374 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2375 * setting of the IPV6 flow label value. The value is
2376 * contained in the spp_ipv6_flowlabel field.
2377 * Upon retrieval, this flag will be set to indicate that
2378 * the spp_ipv6_flowlabel field has a valid value returned.
2379 * If a specific destination address is set (in the
2380 * spp_address field), then the value returned is that of
2381 * the address. If just an association is specified (and
2382 * no address), then the association's default flow label
2383 * is returned. If neither an association nor a destination
2384 * is specified, then the socket's default flow label is
2385 * returned. For non-IPv6 sockets, this flag will be left
2388 * SPP_DSCP: Setting this flag enables the setting of the
2389 * Differentiated Services Code Point (DSCP) value
2390 * associated with either the association or a specific
2391 * address. The value is obtained in the spp_dscp field.
2392 * Upon retrieval, this flag will be set to indicate that
2393 * the spp_dscp field has a valid value returned. If a
2394 * specific destination address is set when called (in the
2395 * spp_address field), then that specific destination
2396 * address's DSCP value is returned. If just an association
2397 * is specified, then the association's default DSCP is
2398 * returned. If neither an association nor a destination is
2399 * specified, then the socket's default DSCP is returned.
2401 * spp_ipv6_flowlabel
2402 * - This field is used in conjunction with the
2403 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2404 * The 20 least significant bits are used for the flow
2405 * label. This setting has precedence over any IPv6-layer
2408 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2409 * and contains the DSCP. The 6 most significant bits are
2410 * used for the DSCP. This setting has precedence over any
2411 * IPv4- or IPv6- layer setting.
2413 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2414 struct sctp_transport *trans,
2415 struct sctp_association *asoc,
2416 struct sctp_sock *sp,
2419 int sackdelay_change)
2423 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2424 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2425 trans->asoc, trans);
2430 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2431 * this field is ignored. Note also that a value of zero indicates
2432 * the current setting should be left unchanged.
2434 if (params->spp_flags & SPP_HB_ENABLE) {
2436 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2437 * set. This lets us use 0 value when this flag
2440 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2441 params->spp_hbinterval = 0;
2443 if (params->spp_hbinterval ||
2444 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2447 msecs_to_jiffies(params->spp_hbinterval);
2450 msecs_to_jiffies(params->spp_hbinterval);
2452 sp->hbinterval = params->spp_hbinterval;
2459 trans->param_flags =
2460 (trans->param_flags & ~SPP_HB) | hb_change;
2463 (asoc->param_flags & ~SPP_HB) | hb_change;
2466 (sp->param_flags & ~SPP_HB) | hb_change;
2470 /* When Path MTU discovery is disabled the value specified here will
2471 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2472 * include the flag SPP_PMTUD_DISABLE for this field to have any
2475 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2477 trans->pathmtu = params->spp_pathmtu;
2478 sctp_assoc_sync_pmtu(asoc);
2480 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2482 sp->pathmtu = params->spp_pathmtu;
2488 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2489 (params->spp_flags & SPP_PMTUD_ENABLE);
2490 trans->param_flags =
2491 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2493 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2494 sctp_assoc_sync_pmtu(asoc);
2496 sctp_transport_pl_reset(trans);
2499 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2502 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2506 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2507 * value of this field is ignored. Note also that a value of zero
2508 * indicates the current setting should be left unchanged.
2510 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2513 msecs_to_jiffies(params->spp_sackdelay);
2516 msecs_to_jiffies(params->spp_sackdelay);
2518 sp->sackdelay = params->spp_sackdelay;
2522 if (sackdelay_change) {
2524 trans->param_flags =
2525 (trans->param_flags & ~SPP_SACKDELAY) |
2529 (asoc->param_flags & ~SPP_SACKDELAY) |
2533 (sp->param_flags & ~SPP_SACKDELAY) |
2538 /* Note that a value of zero indicates the current setting should be
2541 if (params->spp_pathmaxrxt) {
2543 trans->pathmaxrxt = params->spp_pathmaxrxt;
2545 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2547 sp->pathmaxrxt = params->spp_pathmaxrxt;
2551 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2553 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2554 trans->flowlabel = params->spp_ipv6_flowlabel &
2555 SCTP_FLOWLABEL_VAL_MASK;
2556 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2559 struct sctp_transport *t;
2561 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2563 if (t->ipaddr.sa.sa_family != AF_INET6)
2565 t->flowlabel = params->spp_ipv6_flowlabel &
2566 SCTP_FLOWLABEL_VAL_MASK;
2567 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2569 asoc->flowlabel = params->spp_ipv6_flowlabel &
2570 SCTP_FLOWLABEL_VAL_MASK;
2571 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2572 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2573 sp->flowlabel = params->spp_ipv6_flowlabel &
2574 SCTP_FLOWLABEL_VAL_MASK;
2575 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2579 if (params->spp_flags & SPP_DSCP) {
2581 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2582 trans->dscp |= SCTP_DSCP_SET_MASK;
2584 struct sctp_transport *t;
2586 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2588 t->dscp = params->spp_dscp &
2590 t->dscp |= SCTP_DSCP_SET_MASK;
2592 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2593 asoc->dscp |= SCTP_DSCP_SET_MASK;
2595 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596 sp->dscp |= SCTP_DSCP_SET_MASK;
2603 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2604 struct sctp_paddrparams *params,
2605 unsigned int optlen)
2607 struct sctp_transport *trans = NULL;
2608 struct sctp_association *asoc = NULL;
2609 struct sctp_sock *sp = sctp_sk(sk);
2611 int hb_change, pmtud_change, sackdelay_change;
2613 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2614 spp_ipv6_flowlabel), 4)) {
2615 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2617 } else if (optlen != sizeof(*params)) {
2621 /* Validate flags and value parameters. */
2622 hb_change = params->spp_flags & SPP_HB;
2623 pmtud_change = params->spp_flags & SPP_PMTUD;
2624 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2626 if (hb_change == SPP_HB ||
2627 pmtud_change == SPP_PMTUD ||
2628 sackdelay_change == SPP_SACKDELAY ||
2629 params->spp_sackdelay > 500 ||
2630 (params->spp_pathmtu &&
2631 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2634 /* If an address other than INADDR_ANY is specified, and
2635 * no transport is found, then the request is invalid.
2637 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2638 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2639 params->spp_assoc_id);
2644 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2645 * socket is a one to many style socket, and an association
2646 * was not found, then the id was invalid.
2648 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2649 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2650 sctp_style(sk, UDP))
2653 /* Heartbeat demand can only be sent on a transport or
2654 * association, but not a socket.
2656 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2659 /* Process parameters. */
2660 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2661 hb_change, pmtud_change,
2667 /* If changes are for association, also apply parameters to each
2670 if (!trans && asoc) {
2671 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2673 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2674 hb_change, pmtud_change,
2682 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2684 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2687 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2689 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2692 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2693 struct sctp_association *asoc)
2695 struct sctp_transport *trans;
2697 if (params->sack_delay) {
2698 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2700 sctp_spp_sackdelay_enable(asoc->param_flags);
2702 if (params->sack_freq == 1) {
2704 sctp_spp_sackdelay_disable(asoc->param_flags);
2705 } else if (params->sack_freq > 1) {
2706 asoc->sackfreq = params->sack_freq;
2708 sctp_spp_sackdelay_enable(asoc->param_flags);
2711 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2713 if (params->sack_delay) {
2714 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2715 trans->param_flags =
2716 sctp_spp_sackdelay_enable(trans->param_flags);
2718 if (params->sack_freq == 1) {
2719 trans->param_flags =
2720 sctp_spp_sackdelay_disable(trans->param_flags);
2721 } else if (params->sack_freq > 1) {
2722 trans->sackfreq = params->sack_freq;
2723 trans->param_flags =
2724 sctp_spp_sackdelay_enable(trans->param_flags);
2730 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2732 * This option will effect the way delayed acks are performed. This
2733 * option allows you to get or set the delayed ack time, in
2734 * milliseconds. It also allows changing the delayed ack frequency.
2735 * Changing the frequency to 1 disables the delayed sack algorithm. If
2736 * the assoc_id is 0, then this sets or gets the endpoints default
2737 * values. If the assoc_id field is non-zero, then the set or get
2738 * effects the specified association for the one to many model (the
2739 * assoc_id field is ignored by the one to one model). Note that if
2740 * sack_delay or sack_freq are 0 when setting this option, then the
2741 * current values will remain unchanged.
2743 * struct sctp_sack_info {
2744 * sctp_assoc_t sack_assoc_id;
2745 * uint32_t sack_delay;
2746 * uint32_t sack_freq;
2749 * sack_assoc_id - This parameter, indicates which association the user
2750 * is performing an action upon. Note that if this field's value is
2751 * zero then the endpoints default value is changed (effecting future
2752 * associations only).
2754 * sack_delay - This parameter contains the number of milliseconds that
2755 * the user is requesting the delayed ACK timer be set to. Note that
2756 * this value is defined in the standard to be between 200 and 500
2759 * sack_freq - This parameter contains the number of packets that must
2760 * be received before a sack is sent without waiting for the delay
2761 * timer to expire. The default value for this is 2, setting this
2762 * value to 1 will disable the delayed sack algorithm.
2764 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2765 struct sctp_sack_info *params)
2767 struct sctp_sock *sp = sctp_sk(sk);
2768 struct sctp_association *asoc;
2770 /* Validate value parameter. */
2771 if (params->sack_delay > 500)
2774 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2775 * socket is a one to many style socket, and an association
2776 * was not found, then the id was invalid.
2778 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2779 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2780 sctp_style(sk, UDP))
2784 sctp_apply_asoc_delayed_ack(params, asoc);
2789 if (sctp_style(sk, TCP))
2790 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2792 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2793 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2794 if (params->sack_delay) {
2795 sp->sackdelay = params->sack_delay;
2797 sctp_spp_sackdelay_enable(sp->param_flags);
2799 if (params->sack_freq == 1) {
2801 sctp_spp_sackdelay_disable(sp->param_flags);
2802 } else if (params->sack_freq > 1) {
2803 sp->sackfreq = params->sack_freq;
2805 sctp_spp_sackdelay_enable(sp->param_flags);
2809 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2810 params->sack_assoc_id == SCTP_ALL_ASSOC)
2811 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2812 sctp_apply_asoc_delayed_ack(params, asoc);
2817 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2818 struct sctp_sack_info *params,
2819 unsigned int optlen)
2821 if (optlen == sizeof(struct sctp_assoc_value)) {
2822 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2823 struct sctp_sack_info p;
2825 pr_warn_ratelimited(DEPRECATED
2827 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2828 "Use struct sctp_sack_info instead\n",
2829 current->comm, task_pid_nr(current));
2831 p.sack_assoc_id = v->assoc_id;
2832 p.sack_delay = v->assoc_value;
2833 p.sack_freq = v->assoc_value ? 0 : 1;
2834 return __sctp_setsockopt_delayed_ack(sk, &p);
2837 if (optlen != sizeof(struct sctp_sack_info))
2839 if (params->sack_delay == 0 && params->sack_freq == 0)
2841 return __sctp_setsockopt_delayed_ack(sk, params);
2844 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2846 * Applications can specify protocol parameters for the default association
2847 * initialization. The option name argument to setsockopt() and getsockopt()
2850 * Setting initialization parameters is effective only on an unconnected
2851 * socket (for UDP-style sockets only future associations are effected
2852 * by the change). With TCP-style sockets, this option is inherited by
2853 * sockets derived from a listener socket.
2855 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2856 unsigned int optlen)
2858 struct sctp_sock *sp = sctp_sk(sk);
2860 if (optlen != sizeof(struct sctp_initmsg))
2863 if (sinit->sinit_num_ostreams)
2864 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2865 if (sinit->sinit_max_instreams)
2866 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2867 if (sinit->sinit_max_attempts)
2868 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2869 if (sinit->sinit_max_init_timeo)
2870 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2876 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2878 * Applications that wish to use the sendto() system call may wish to
2879 * specify a default set of parameters that would normally be supplied
2880 * through the inclusion of ancillary data. This socket option allows
2881 * such an application to set the default sctp_sndrcvinfo structure.
2882 * The application that wishes to use this socket option simply passes
2883 * in to this call the sctp_sndrcvinfo structure defined in Section
2884 * 5.2.2) The input parameters accepted by this call include
2885 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2886 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2887 * to this call if the caller is using the UDP model.
2889 static int sctp_setsockopt_default_send_param(struct sock *sk,
2890 struct sctp_sndrcvinfo *info,
2891 unsigned int optlen)
2893 struct sctp_sock *sp = sctp_sk(sk);
2894 struct sctp_association *asoc;
2896 if (optlen != sizeof(*info))
2898 if (info->sinfo_flags &
2899 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2900 SCTP_ABORT | SCTP_EOF))
2903 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2904 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2905 sctp_style(sk, UDP))
2909 asoc->default_stream = info->sinfo_stream;
2910 asoc->default_flags = info->sinfo_flags;
2911 asoc->default_ppid = info->sinfo_ppid;
2912 asoc->default_context = info->sinfo_context;
2913 asoc->default_timetolive = info->sinfo_timetolive;
2918 if (sctp_style(sk, TCP))
2919 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2921 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2922 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2923 sp->default_stream = info->sinfo_stream;
2924 sp->default_flags = info->sinfo_flags;
2925 sp->default_ppid = info->sinfo_ppid;
2926 sp->default_context = info->sinfo_context;
2927 sp->default_timetolive = info->sinfo_timetolive;
2930 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2931 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2932 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2933 asoc->default_stream = info->sinfo_stream;
2934 asoc->default_flags = info->sinfo_flags;
2935 asoc->default_ppid = info->sinfo_ppid;
2936 asoc->default_context = info->sinfo_context;
2937 asoc->default_timetolive = info->sinfo_timetolive;
2944 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2945 * (SCTP_DEFAULT_SNDINFO)
2947 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2948 struct sctp_sndinfo *info,
2949 unsigned int optlen)
2951 struct sctp_sock *sp = sctp_sk(sk);
2952 struct sctp_association *asoc;
2954 if (optlen != sizeof(*info))
2956 if (info->snd_flags &
2957 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2958 SCTP_ABORT | SCTP_EOF))
2961 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2962 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2963 sctp_style(sk, UDP))
2967 asoc->default_stream = info->snd_sid;
2968 asoc->default_flags = info->snd_flags;
2969 asoc->default_ppid = info->snd_ppid;
2970 asoc->default_context = info->snd_context;
2975 if (sctp_style(sk, TCP))
2976 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2978 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2979 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2980 sp->default_stream = info->snd_sid;
2981 sp->default_flags = info->snd_flags;
2982 sp->default_ppid = info->snd_ppid;
2983 sp->default_context = info->snd_context;
2986 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2987 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2988 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2989 asoc->default_stream = info->snd_sid;
2990 asoc->default_flags = info->snd_flags;
2991 asoc->default_ppid = info->snd_ppid;
2992 asoc->default_context = info->snd_context;
2999 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3001 * Requests that the local SCTP stack use the enclosed peer address as
3002 * the association primary. The enclosed address must be one of the
3003 * association peer's addresses.
3005 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3006 unsigned int optlen)
3008 struct sctp_transport *trans;
3012 if (optlen != sizeof(struct sctp_prim))
3015 /* Allow security module to validate address but need address len. */
3016 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3020 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3021 (struct sockaddr *)&prim->ssp_addr,
3026 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3030 sctp_assoc_set_primary(trans->asoc, trans);
3036 * 7.1.5 SCTP_NODELAY
3038 * Turn on/off any Nagle-like algorithm. This means that packets are
3039 * generally sent as soon as possible and no unnecessary delays are
3040 * introduced, at the cost of more packets in the network. Expects an
3041 * integer boolean flag.
3043 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3044 unsigned int optlen)
3046 if (optlen < sizeof(int))
3048 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3054 * 7.1.1 SCTP_RTOINFO
3056 * The protocol parameters used to initialize and bound retransmission
3057 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3058 * and modify these parameters.
3059 * All parameters are time values, in milliseconds. A value of 0, when
3060 * modifying the parameters, indicates that the current value should not
3064 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3065 struct sctp_rtoinfo *rtoinfo,
3066 unsigned int optlen)
3068 struct sctp_association *asoc;
3069 unsigned long rto_min, rto_max;
3070 struct sctp_sock *sp = sctp_sk(sk);
3072 if (optlen != sizeof (struct sctp_rtoinfo))
3075 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3077 /* Set the values to the specific association */
3078 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3079 sctp_style(sk, UDP))
3082 rto_max = rtoinfo->srto_max;
3083 rto_min = rtoinfo->srto_min;
3086 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3088 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3091 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3093 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3095 if (rto_min > rto_max)
3099 if (rtoinfo->srto_initial != 0)
3101 msecs_to_jiffies(rtoinfo->srto_initial);
3102 asoc->rto_max = rto_max;
3103 asoc->rto_min = rto_min;
3105 /* If there is no association or the association-id = 0
3106 * set the values to the endpoint.
3108 if (rtoinfo->srto_initial != 0)
3109 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3110 sp->rtoinfo.srto_max = rto_max;
3111 sp->rtoinfo.srto_min = rto_min;
3119 * 7.1.2 SCTP_ASSOCINFO
3121 * This option is used to tune the maximum retransmission attempts
3122 * of the association.
3123 * Returns an error if the new association retransmission value is
3124 * greater than the sum of the retransmission value of the peer.
3125 * See [SCTP] for more information.
3128 static int sctp_setsockopt_associnfo(struct sock *sk,
3129 struct sctp_assocparams *assocparams,
3130 unsigned int optlen)
3133 struct sctp_association *asoc;
3135 if (optlen != sizeof(struct sctp_assocparams))
3138 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3140 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3141 sctp_style(sk, UDP))
3144 /* Set the values to the specific association */
3146 if (assocparams->sasoc_asocmaxrxt != 0) {
3149 struct sctp_transport *peer_addr;
3151 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3153 path_sum += peer_addr->pathmaxrxt;
3157 /* Only validate asocmaxrxt if we have more than
3158 * one path/transport. We do this because path
3159 * retransmissions are only counted when we have more
3163 assocparams->sasoc_asocmaxrxt > path_sum)
3166 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3169 if (assocparams->sasoc_cookie_life != 0)
3171 ms_to_ktime(assocparams->sasoc_cookie_life);
3173 /* Set the values to the endpoint */
3174 struct sctp_sock *sp = sctp_sk(sk);
3176 if (assocparams->sasoc_asocmaxrxt != 0)
3177 sp->assocparams.sasoc_asocmaxrxt =
3178 assocparams->sasoc_asocmaxrxt;
3179 if (assocparams->sasoc_cookie_life != 0)
3180 sp->assocparams.sasoc_cookie_life =
3181 assocparams->sasoc_cookie_life;
3187 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3189 * This socket option is a boolean flag which turns on or off mapped V4
3190 * addresses. If this option is turned on and the socket is type
3191 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3192 * If this option is turned off, then no mapping will be done of V4
3193 * addresses and a user will receive both PF_INET6 and PF_INET type
3194 * addresses on the socket.
3196 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3197 unsigned int optlen)
3199 struct sctp_sock *sp = sctp_sk(sk);
3201 if (optlen < sizeof(int))
3212 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3213 * This option will get or set the maximum size to put in any outgoing
3214 * SCTP DATA chunk. If a message is larger than this size it will be
3215 * fragmented by SCTP into the specified size. Note that the underlying
3216 * SCTP implementation may fragment into smaller sized chunks when the
3217 * PMTU of the underlying association is smaller than the value set by
3218 * the user. The default value for this option is '0' which indicates
3219 * the user is NOT limiting fragmentation and only the PMTU will effect
3220 * SCTP's choice of DATA chunk size. Note also that values set larger
3221 * than the maximum size of an IP datagram will effectively let SCTP
3222 * control fragmentation (i.e. the same as setting this option to 0).
3224 * The following structure is used to access and modify this parameter:
3226 * struct sctp_assoc_value {
3227 * sctp_assoc_t assoc_id;
3228 * uint32_t assoc_value;
3231 * assoc_id: This parameter is ignored for one-to-one style sockets.
3232 * For one-to-many style sockets this parameter indicates which
3233 * association the user is performing an action upon. Note that if
3234 * this field's value is zero then the endpoints default value is
3235 * changed (effecting future associations only).
3236 * assoc_value: This parameter specifies the maximum size in bytes.
3238 static int sctp_setsockopt_maxseg(struct sock *sk,
3239 struct sctp_assoc_value *params,
3240 unsigned int optlen)
3242 struct sctp_sock *sp = sctp_sk(sk);
3243 struct sctp_association *asoc;
3244 sctp_assoc_t assoc_id;
3247 if (optlen == sizeof(int)) {
3248 pr_warn_ratelimited(DEPRECATED
3250 "Use of int in maxseg socket option.\n"
3251 "Use struct sctp_assoc_value instead\n",
3252 current->comm, task_pid_nr(current));
3253 assoc_id = SCTP_FUTURE_ASSOC;
3254 val = *(int *)params;
3255 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3256 assoc_id = params->assoc_id;
3257 val = params->assoc_value;
3262 asoc = sctp_id2assoc(sk, assoc_id);
3263 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3264 sctp_style(sk, UDP))
3268 int min_len, max_len;
3269 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3270 sizeof(struct sctp_data_chunk);
3272 min_len = sctp_min_frag_point(sp, datasize);
3273 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3275 if (val < min_len || val > max_len)
3280 asoc->user_frag = val;
3281 sctp_assoc_update_frag_point(asoc);
3283 sp->user_frag = val;
3291 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3293 * Requests that the peer mark the enclosed address as the association
3294 * primary. The enclosed address must be one of the association's
3295 * locally bound addresses. The following structure is used to make a
3296 * set primary request:
3298 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3299 struct sctp_setpeerprim *prim,
3300 unsigned int optlen)
3302 struct sctp_sock *sp;
3303 struct sctp_association *asoc = NULL;
3304 struct sctp_chunk *chunk;
3310 if (!sp->ep->asconf_enable)
3313 if (optlen != sizeof(struct sctp_setpeerprim))
3316 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3320 if (!asoc->peer.asconf_capable)
3323 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3326 if (!sctp_state(asoc, ESTABLISHED))
3329 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3333 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3334 return -EADDRNOTAVAIL;
3336 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3337 return -EADDRNOTAVAIL;
3339 /* Allow security module to validate address. */
3340 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3341 (struct sockaddr *)&prim->sspp_addr,
3346 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3347 chunk = sctp_make_asconf_set_prim(asoc,
3348 (union sctp_addr *)&prim->sspp_addr);
3352 err = sctp_send_asconf(asoc, chunk);
3354 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3359 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3360 struct sctp_setadaptation *adapt,
3361 unsigned int optlen)
3363 if (optlen != sizeof(struct sctp_setadaptation))
3366 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3372 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3374 * The context field in the sctp_sndrcvinfo structure is normally only
3375 * used when a failed message is retrieved holding the value that was
3376 * sent down on the actual send call. This option allows the setting of
3377 * a default context on an association basis that will be received on
3378 * reading messages from the peer. This is especially helpful in the
3379 * one-2-many model for an application to keep some reference to an
3380 * internal state machine that is processing messages on the
3381 * association. Note that the setting of this value only effects
3382 * received messages from the peer and does not effect the value that is
3383 * saved with outbound messages.
3385 static int sctp_setsockopt_context(struct sock *sk,
3386 struct sctp_assoc_value *params,
3387 unsigned int optlen)
3389 struct sctp_sock *sp = sctp_sk(sk);
3390 struct sctp_association *asoc;
3392 if (optlen != sizeof(struct sctp_assoc_value))
3395 asoc = sctp_id2assoc(sk, params->assoc_id);
3396 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3397 sctp_style(sk, UDP))
3401 asoc->default_rcv_context = params->assoc_value;
3406 if (sctp_style(sk, TCP))
3407 params->assoc_id = SCTP_FUTURE_ASSOC;
3409 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3410 params->assoc_id == SCTP_ALL_ASSOC)
3411 sp->default_rcv_context = params->assoc_value;
3413 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3414 params->assoc_id == SCTP_ALL_ASSOC)
3415 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3416 asoc->default_rcv_context = params->assoc_value;
3422 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3424 * This options will at a minimum specify if the implementation is doing
3425 * fragmented interleave. Fragmented interleave, for a one to many
3426 * socket, is when subsequent calls to receive a message may return
3427 * parts of messages from different associations. Some implementations
3428 * may allow you to turn this value on or off. If so, when turned off,
3429 * no fragment interleave will occur (which will cause a head of line
3430 * blocking amongst multiple associations sharing the same one to many
3431 * socket). When this option is turned on, then each receive call may
3432 * come from a different association (thus the user must receive data
3433 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3434 * association each receive belongs to.
3436 * This option takes a boolean value. A non-zero value indicates that
3437 * fragmented interleave is on. A value of zero indicates that
3438 * fragmented interleave is off.
3440 * Note that it is important that an implementation that allows this
3441 * option to be turned on, have it off by default. Otherwise an unaware
3442 * application using the one to many model may become confused and act
3445 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3446 unsigned int optlen)
3448 if (optlen != sizeof(int))
3451 sctp_sk(sk)->frag_interleave = !!*val;
3453 if (!sctp_sk(sk)->frag_interleave)
3454 sctp_sk(sk)->ep->intl_enable = 0;
3460 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3461 * (SCTP_PARTIAL_DELIVERY_POINT)
3463 * This option will set or get the SCTP partial delivery point. This
3464 * point is the size of a message where the partial delivery API will be
3465 * invoked to help free up rwnd space for the peer. Setting this to a
3466 * lower value will cause partial deliveries to happen more often. The
3467 * calls argument is an integer that sets or gets the partial delivery
3468 * point. Note also that the call will fail if the user attempts to set
3469 * this value larger than the socket receive buffer size.
3471 * Note that any single message having a length smaller than or equal to
3472 * the SCTP partial delivery point will be delivered in one single read
3473 * call as long as the user provided buffer is large enough to hold the
3476 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3477 unsigned int optlen)
3479 if (optlen != sizeof(u32))
3482 /* Note: We double the receive buffer from what the user sets
3483 * it to be, also initial rwnd is based on rcvbuf/2.
3485 if (*val > (sk->sk_rcvbuf >> 1))
3488 sctp_sk(sk)->pd_point = *val;
3490 return 0; /* is this the right error code? */
3494 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3496 * This option will allow a user to change the maximum burst of packets
3497 * that can be emitted by this association. Note that the default value
3498 * is 4, and some implementations may restrict this setting so that it
3499 * can only be lowered.
3501 * NOTE: This text doesn't seem right. Do this on a socket basis with
3502 * future associations inheriting the socket value.
3504 static int sctp_setsockopt_maxburst(struct sock *sk,
3505 struct sctp_assoc_value *params,
3506 unsigned int optlen)
3508 struct sctp_sock *sp = sctp_sk(sk);
3509 struct sctp_association *asoc;
3510 sctp_assoc_t assoc_id;
3513 if (optlen == sizeof(int)) {
3514 pr_warn_ratelimited(DEPRECATED
3516 "Use of int in max_burst socket option deprecated.\n"
3517 "Use struct sctp_assoc_value instead\n",
3518 current->comm, task_pid_nr(current));
3519 assoc_id = SCTP_FUTURE_ASSOC;
3520 assoc_value = *((int *)params);
3521 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3522 assoc_id = params->assoc_id;
3523 assoc_value = params->assoc_value;
3527 asoc = sctp_id2assoc(sk, assoc_id);
3528 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3532 asoc->max_burst = assoc_value;
3537 if (sctp_style(sk, TCP))
3538 assoc_id = SCTP_FUTURE_ASSOC;
3540 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3541 sp->max_burst = assoc_value;
3543 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3544 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3545 asoc->max_burst = assoc_value;
3551 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3553 * This set option adds a chunk type that the user is requesting to be
3554 * received only in an authenticated way. Changes to the list of chunks
3555 * will only effect future associations on the socket.
3557 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3558 struct sctp_authchunk *val,
3559 unsigned int optlen)
3561 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3563 if (!ep->auth_enable)
3566 if (optlen != sizeof(struct sctp_authchunk))
3569 switch (val->sauth_chunk) {
3571 case SCTP_CID_INIT_ACK:
3572 case SCTP_CID_SHUTDOWN_COMPLETE:
3577 /* add this chunk id to the endpoint */
3578 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3582 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3584 * This option gets or sets the list of HMAC algorithms that the local
3585 * endpoint requires the peer to use.
3587 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3588 struct sctp_hmacalgo *hmacs,
3589 unsigned int optlen)
3591 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3594 if (!ep->auth_enable)
3597 if (optlen < sizeof(struct sctp_hmacalgo))
3599 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3600 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3602 idents = hmacs->shmac_num_idents;
3603 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3604 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3607 return sctp_auth_ep_set_hmacs(ep, hmacs);
3611 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3613 * This option will set a shared secret key which is used to build an
3614 * association shared key.
3616 static int sctp_setsockopt_auth_key(struct sock *sk,
3617 struct sctp_authkey *authkey,
3618 unsigned int optlen)
3620 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3621 struct sctp_association *asoc;
3624 if (optlen <= sizeof(struct sctp_authkey))
3626 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3629 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3631 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3634 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3635 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3636 sctp_style(sk, UDP))
3640 ret = sctp_auth_set_key(ep, asoc, authkey);
3644 if (sctp_style(sk, TCP))
3645 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3647 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3648 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3649 ret = sctp_auth_set_key(ep, asoc, authkey);
3656 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3657 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3658 list_for_each_entry(asoc, &ep->asocs, asocs) {
3659 int res = sctp_auth_set_key(ep, asoc, authkey);
3667 memzero_explicit(authkey, optlen);
3672 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3674 * This option will get or set the active shared key to be used to build
3675 * the association shared key.
3677 static int sctp_setsockopt_active_key(struct sock *sk,
3678 struct sctp_authkeyid *val,
3679 unsigned int optlen)
3681 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3682 struct sctp_association *asoc;
3685 if (optlen != sizeof(struct sctp_authkeyid))
3688 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3689 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3690 sctp_style(sk, UDP))
3694 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3696 if (sctp_style(sk, TCP))
3697 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3699 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3700 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3701 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3706 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3707 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3708 list_for_each_entry(asoc, &ep->asocs, asocs) {
3709 int res = sctp_auth_set_active_key(ep, asoc,
3710 val->scact_keynumber);
3721 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3723 * This set option will delete a shared secret key from use.
3725 static int sctp_setsockopt_del_key(struct sock *sk,
3726 struct sctp_authkeyid *val,
3727 unsigned int optlen)
3729 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3730 struct sctp_association *asoc;
3733 if (optlen != sizeof(struct sctp_authkeyid))
3736 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3737 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3738 sctp_style(sk, UDP))
3742 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3744 if (sctp_style(sk, TCP))
3745 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3747 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3748 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3749 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3754 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3755 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3756 list_for_each_entry(asoc, &ep->asocs, asocs) {
3757 int res = sctp_auth_del_key_id(ep, asoc,
3758 val->scact_keynumber);
3769 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3771 * This set option will deactivate a shared secret key.
3773 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3774 struct sctp_authkeyid *val,
3775 unsigned int optlen)
3777 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3778 struct sctp_association *asoc;
3781 if (optlen != sizeof(struct sctp_authkeyid))
3784 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3785 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3786 sctp_style(sk, UDP))
3790 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3792 if (sctp_style(sk, TCP))
3793 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3795 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3796 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3797 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3802 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3803 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3804 list_for_each_entry(asoc, &ep->asocs, asocs) {
3805 int res = sctp_auth_deact_key_id(ep, asoc,
3806 val->scact_keynumber);
3817 * 8.1.23 SCTP_AUTO_ASCONF
3819 * This option will enable or disable the use of the automatic generation of
3820 * ASCONF chunks to add and delete addresses to an existing association. Note
3821 * that this option has two caveats namely: a) it only affects sockets that
3822 * are bound to all addresses available to the SCTP stack, and b) the system
3823 * administrator may have an overriding control that turns the ASCONF feature
3824 * off no matter what setting the socket option may have.
3825 * This option expects an integer boolean flag, where a non-zero value turns on
3826 * the option, and a zero value turns off the option.
3827 * Note. In this implementation, socket operation overrides default parameter
3828 * being set by sysctl as well as FreeBSD implementation
3830 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3831 unsigned int optlen)
3833 struct sctp_sock *sp = sctp_sk(sk);
3835 if (optlen < sizeof(int))
3837 if (!sctp_is_ep_boundall(sk) && *val)
3839 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3842 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3843 if (*val == 0 && sp->do_auto_asconf) {
3844 list_del(&sp->auto_asconf_list);
3845 sp->do_auto_asconf = 0;
3846 } else if (*val && !sp->do_auto_asconf) {
3847 list_add_tail(&sp->auto_asconf_list,
3848 &sock_net(sk)->sctp.auto_asconf_splist);
3849 sp->do_auto_asconf = 1;
3851 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3856 * SCTP_PEER_ADDR_THLDS
3858 * This option allows us to alter the partially failed threshold for one or all
3859 * transports in an association. See Section 6.1 of:
3860 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3862 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3863 struct sctp_paddrthlds_v2 *val,
3864 unsigned int optlen, bool v2)
3866 struct sctp_transport *trans;
3867 struct sctp_association *asoc;
3870 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3874 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3877 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3878 trans = sctp_addr_id2transport(sk, &val->spt_address,
3883 if (val->spt_pathmaxrxt)
3884 trans->pathmaxrxt = val->spt_pathmaxrxt;
3886 trans->ps_retrans = val->spt_pathcpthld;
3887 trans->pf_retrans = val->spt_pathpfthld;
3892 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3893 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3894 sctp_style(sk, UDP))
3898 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3900 if (val->spt_pathmaxrxt)
3901 trans->pathmaxrxt = val->spt_pathmaxrxt;
3903 trans->ps_retrans = val->spt_pathcpthld;
3904 trans->pf_retrans = val->spt_pathpfthld;
3907 if (val->spt_pathmaxrxt)
3908 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3910 asoc->ps_retrans = val->spt_pathcpthld;
3911 asoc->pf_retrans = val->spt_pathpfthld;
3913 struct sctp_sock *sp = sctp_sk(sk);
3915 if (val->spt_pathmaxrxt)
3916 sp->pathmaxrxt = val->spt_pathmaxrxt;
3918 sp->ps_retrans = val->spt_pathcpthld;
3919 sp->pf_retrans = val->spt_pathpfthld;
3925 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3926 unsigned int optlen)
3928 if (optlen < sizeof(int))
3931 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3936 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3937 unsigned int optlen)
3939 if (optlen < sizeof(int))
3942 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3947 static int sctp_setsockopt_pr_supported(struct sock *sk,
3948 struct sctp_assoc_value *params,
3949 unsigned int optlen)
3951 struct sctp_association *asoc;
3953 if (optlen != sizeof(*params))
3956 asoc = sctp_id2assoc(sk, params->assoc_id);
3957 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3958 sctp_style(sk, UDP))
3961 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3966 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3967 struct sctp_default_prinfo *info,
3968 unsigned int optlen)
3970 struct sctp_sock *sp = sctp_sk(sk);
3971 struct sctp_association *asoc;
3972 int retval = -EINVAL;
3974 if (optlen != sizeof(*info))
3977 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3980 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3983 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3984 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3985 sctp_style(sk, UDP))
3991 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3992 asoc->default_timetolive = info->pr_value;
3996 if (sctp_style(sk, TCP))
3997 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
3999 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4000 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4001 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4002 sp->default_timetolive = info->pr_value;
4005 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4006 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4007 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4008 SCTP_PR_SET_POLICY(asoc->default_flags,
4010 asoc->default_timetolive = info->pr_value;
4018 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4019 struct sctp_assoc_value *params,
4020 unsigned int optlen)
4022 struct sctp_association *asoc;
4023 int retval = -EINVAL;
4025 if (optlen != sizeof(*params))
4028 asoc = sctp_id2assoc(sk, params->assoc_id);
4029 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4030 sctp_style(sk, UDP))
4033 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4041 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4042 struct sctp_assoc_value *params,
4043 unsigned int optlen)
4045 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4046 struct sctp_association *asoc;
4047 int retval = -EINVAL;
4049 if (optlen != sizeof(*params))
4052 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4055 asoc = sctp_id2assoc(sk, params->assoc_id);
4056 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4057 sctp_style(sk, UDP))
4063 asoc->strreset_enable = params->assoc_value;
4067 if (sctp_style(sk, TCP))
4068 params->assoc_id = SCTP_FUTURE_ASSOC;
4070 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4071 params->assoc_id == SCTP_ALL_ASSOC)
4072 ep->strreset_enable = params->assoc_value;
4074 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4075 params->assoc_id == SCTP_ALL_ASSOC)
4076 list_for_each_entry(asoc, &ep->asocs, asocs)
4077 asoc->strreset_enable = params->assoc_value;
4083 static int sctp_setsockopt_reset_streams(struct sock *sk,
4084 struct sctp_reset_streams *params,
4085 unsigned int optlen)
4087 struct sctp_association *asoc;
4089 if (optlen < sizeof(*params))
4091 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4092 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4093 sizeof(__u16) * sizeof(*params));
4095 if (params->srs_number_streams * sizeof(__u16) >
4096 optlen - sizeof(*params))
4099 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4103 return sctp_send_reset_streams(asoc, params);
4106 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4107 unsigned int optlen)
4109 struct sctp_association *asoc;
4111 if (optlen != sizeof(*associd))
4114 asoc = sctp_id2assoc(sk, *associd);
4118 return sctp_send_reset_assoc(asoc);
4121 static int sctp_setsockopt_add_streams(struct sock *sk,
4122 struct sctp_add_streams *params,
4123 unsigned int optlen)
4125 struct sctp_association *asoc;
4127 if (optlen != sizeof(*params))
4130 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4134 return sctp_send_add_streams(asoc, params);
4137 static int sctp_setsockopt_scheduler(struct sock *sk,
4138 struct sctp_assoc_value *params,
4139 unsigned int optlen)
4141 struct sctp_sock *sp = sctp_sk(sk);
4142 struct sctp_association *asoc;
4145 if (optlen < sizeof(*params))
4148 if (params->assoc_value > SCTP_SS_MAX)
4151 asoc = sctp_id2assoc(sk, params->assoc_id);
4152 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4153 sctp_style(sk, UDP))
4157 return sctp_sched_set_sched(asoc, params->assoc_value);
4159 if (sctp_style(sk, TCP))
4160 params->assoc_id = SCTP_FUTURE_ASSOC;
4162 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4163 params->assoc_id == SCTP_ALL_ASSOC)
4164 sp->default_ss = params->assoc_value;
4166 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4167 params->assoc_id == SCTP_ALL_ASSOC) {
4168 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4169 int ret = sctp_sched_set_sched(asoc,
4170 params->assoc_value);
4180 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4181 struct sctp_stream_value *params,
4182 unsigned int optlen)
4184 struct sctp_association *asoc;
4185 int retval = -EINVAL;
4187 if (optlen < sizeof(*params))
4190 asoc = sctp_id2assoc(sk, params->assoc_id);
4191 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4192 sctp_style(sk, UDP))
4196 retval = sctp_sched_set_value(asoc, params->stream_id,
4197 params->stream_value, GFP_KERNEL);
4203 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4204 int ret = sctp_sched_set_value(asoc, params->stream_id,
4205 params->stream_value,
4207 if (ret && !retval) /* try to return the 1st error. */
4215 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4216 struct sctp_assoc_value *p,
4217 unsigned int optlen)
4219 struct sctp_sock *sp = sctp_sk(sk);
4220 struct sctp_association *asoc;
4222 if (optlen < sizeof(*p))
4225 asoc = sctp_id2assoc(sk, p->assoc_id);
4226 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4229 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4233 sp->ep->intl_enable = !!p->assoc_value;
4237 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4238 unsigned int optlen)
4240 if (!sctp_style(sk, TCP))
4243 if (sctp_sk(sk)->ep->base.bind_addr.port)
4246 if (optlen < sizeof(int))
4249 sctp_sk(sk)->reuse = !!*val;
4254 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4255 struct sctp_association *asoc)
4257 struct sctp_ulpevent *event;
4259 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4261 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4262 if (sctp_outq_is_empty(&asoc->outqueue)) {
4263 event = sctp_ulpevent_make_sender_dry_event(asoc,
4264 GFP_USER | __GFP_NOWARN);
4268 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4275 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4276 unsigned int optlen)
4278 struct sctp_sock *sp = sctp_sk(sk);
4279 struct sctp_association *asoc;
4282 if (optlen < sizeof(*param))
4285 if (param->se_type < SCTP_SN_TYPE_BASE ||
4286 param->se_type > SCTP_SN_TYPE_MAX)
4289 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4290 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4291 sctp_style(sk, UDP))
4295 return sctp_assoc_ulpevent_type_set(param, asoc);
4297 if (sctp_style(sk, TCP))
4298 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4300 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4301 param->se_assoc_id == SCTP_ALL_ASSOC)
4302 sctp_ulpevent_type_set(&sp->subscribe,
4303 param->se_type, param->se_on);
4305 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4306 param->se_assoc_id == SCTP_ALL_ASSOC) {
4307 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4308 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4318 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4319 struct sctp_assoc_value *params,
4320 unsigned int optlen)
4322 struct sctp_association *asoc;
4323 struct sctp_endpoint *ep;
4324 int retval = -EINVAL;
4326 if (optlen != sizeof(*params))
4329 asoc = sctp_id2assoc(sk, params->assoc_id);
4330 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4331 sctp_style(sk, UDP))
4334 ep = sctp_sk(sk)->ep;
4335 ep->asconf_enable = !!params->assoc_value;
4337 if (ep->asconf_enable && ep->auth_enable) {
4338 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4339 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4348 static int sctp_setsockopt_auth_supported(struct sock *sk,
4349 struct sctp_assoc_value *params,
4350 unsigned int optlen)
4352 struct sctp_association *asoc;
4353 struct sctp_endpoint *ep;
4354 int retval = -EINVAL;
4356 if (optlen != sizeof(*params))
4359 asoc = sctp_id2assoc(sk, params->assoc_id);
4360 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4361 sctp_style(sk, UDP))
4364 ep = sctp_sk(sk)->ep;
4365 if (params->assoc_value) {
4366 retval = sctp_auth_init(ep, GFP_KERNEL);
4369 if (ep->asconf_enable) {
4370 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4371 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4375 ep->auth_enable = !!params->assoc_value;
4382 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4383 struct sctp_assoc_value *params,
4384 unsigned int optlen)
4386 struct sctp_association *asoc;
4387 int retval = -EINVAL;
4389 if (optlen != sizeof(*params))
4392 asoc = sctp_id2assoc(sk, params->assoc_id);
4393 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4394 sctp_style(sk, UDP))
4397 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4404 static int sctp_setsockopt_pf_expose(struct sock *sk,
4405 struct sctp_assoc_value *params,
4406 unsigned int optlen)
4408 struct sctp_association *asoc;
4409 int retval = -EINVAL;
4411 if (optlen != sizeof(*params))
4414 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4417 asoc = sctp_id2assoc(sk, params->assoc_id);
4418 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4419 sctp_style(sk, UDP))
4423 asoc->pf_expose = params->assoc_value;
4425 sctp_sk(sk)->pf_expose = params->assoc_value;
4432 static int sctp_setsockopt_encap_port(struct sock *sk,
4433 struct sctp_udpencaps *encap,
4434 unsigned int optlen)
4436 struct sctp_association *asoc;
4437 struct sctp_transport *t;
4440 if (optlen != sizeof(*encap))
4443 /* If an address other than INADDR_ANY is specified, and
4444 * no transport is found, then the request is invalid.
4446 encap_port = (__force __be16)encap->sue_port;
4447 if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4448 t = sctp_addr_id2transport(sk, &encap->sue_address,
4449 encap->sue_assoc_id);
4453 t->encap_port = encap_port;
4457 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4458 * socket is a one to many style socket, and an association
4459 * was not found, then the id was invalid.
4461 asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4462 if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4463 sctp_style(sk, UDP))
4466 /* If changes are for association, also apply encap_port to
4470 list_for_each_entry(t, &asoc->peer.transport_addr_list,
4472 t->encap_port = encap_port;
4474 asoc->encap_port = encap_port;
4478 sctp_sk(sk)->encap_port = encap_port;
4482 static int sctp_setsockopt_probe_interval(struct sock *sk,
4483 struct sctp_probeinterval *params,
4484 unsigned int optlen)
4486 struct sctp_association *asoc;
4487 struct sctp_transport *t;
4488 __u32 probe_interval;
4490 if (optlen != sizeof(*params))
4493 probe_interval = params->spi_interval;
4494 if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4497 /* If an address other than INADDR_ANY is specified, and
4498 * no transport is found, then the request is invalid.
4500 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spi_address)) {
4501 t = sctp_addr_id2transport(sk, ¶ms->spi_address,
4502 params->spi_assoc_id);
4506 t->probe_interval = msecs_to_jiffies(probe_interval);
4507 sctp_transport_pl_reset(t);
4511 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4512 * socket is a one to many style socket, and an association
4513 * was not found, then the id was invalid.
4515 asoc = sctp_id2assoc(sk, params->spi_assoc_id);
4516 if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4517 sctp_style(sk, UDP))
4520 /* If changes are for association, also apply probe_interval to
4524 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4525 t->probe_interval = msecs_to_jiffies(probe_interval);
4526 sctp_transport_pl_reset(t);
4529 asoc->probe_interval = msecs_to_jiffies(probe_interval);
4533 sctp_sk(sk)->probe_interval = probe_interval;
4537 /* API 6.2 setsockopt(), getsockopt()
4539 * Applications use setsockopt() and getsockopt() to set or retrieve
4540 * socket options. Socket options are used to change the default
4541 * behavior of sockets calls. They are described in Section 7.
4545 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4546 * int __user *optlen);
4547 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4550 * sd - the socket descript.
4551 * level - set to IPPROTO_SCTP for all SCTP options.
4552 * optname - the option name.
4553 * optval - the buffer to store the value of the option.
4554 * optlen - the size of the buffer.
4556 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4557 sockptr_t optval, unsigned int optlen)
4562 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4564 /* I can hardly begin to describe how wrong this is. This is
4565 * so broken as to be worse than useless. The API draft
4566 * REALLY is NOT helpful here... I am not convinced that the
4567 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4568 * are at all well-founded.
4570 if (level != SOL_SCTP) {
4571 struct sctp_af *af = sctp_sk(sk)->pf->af;
4573 return af->setsockopt(sk, level, optname, optval, optlen);
4577 /* Trim it to the biggest size sctp sockopt may need if necessary */
4578 optlen = min_t(unsigned int, optlen,
4579 PAGE_ALIGN(USHRT_MAX +
4580 sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4581 kopt = memdup_sockptr(optval, optlen);
4583 return PTR_ERR(kopt);
4589 case SCTP_SOCKOPT_BINDX_ADD:
4590 /* 'optlen' is the size of the addresses buffer. */
4591 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4592 SCTP_BINDX_ADD_ADDR);
4595 case SCTP_SOCKOPT_BINDX_REM:
4596 /* 'optlen' is the size of the addresses buffer. */
4597 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4598 SCTP_BINDX_REM_ADDR);
4601 case SCTP_SOCKOPT_CONNECTX_OLD:
4602 /* 'optlen' is the size of the addresses buffer. */
4603 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4606 case SCTP_SOCKOPT_CONNECTX:
4607 /* 'optlen' is the size of the addresses buffer. */
4608 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4611 case SCTP_DISABLE_FRAGMENTS:
4612 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4616 retval = sctp_setsockopt_events(sk, kopt, optlen);
4619 case SCTP_AUTOCLOSE:
4620 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4623 case SCTP_PEER_ADDR_PARAMS:
4624 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4627 case SCTP_DELAYED_SACK:
4628 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4630 case SCTP_PARTIAL_DELIVERY_POINT:
4631 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4635 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4637 case SCTP_DEFAULT_SEND_PARAM:
4638 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4640 case SCTP_DEFAULT_SNDINFO:
4641 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4643 case SCTP_PRIMARY_ADDR:
4644 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4646 case SCTP_SET_PEER_PRIMARY_ADDR:
4647 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4650 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4653 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4655 case SCTP_ASSOCINFO:
4656 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4658 case SCTP_I_WANT_MAPPED_V4_ADDR:
4659 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4662 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4664 case SCTP_ADAPTATION_LAYER:
4665 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4668 retval = sctp_setsockopt_context(sk, kopt, optlen);
4670 case SCTP_FRAGMENT_INTERLEAVE:
4671 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4673 case SCTP_MAX_BURST:
4674 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4676 case SCTP_AUTH_CHUNK:
4677 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4679 case SCTP_HMAC_IDENT:
4680 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4683 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4685 case SCTP_AUTH_ACTIVE_KEY:
4686 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4688 case SCTP_AUTH_DELETE_KEY:
4689 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4691 case SCTP_AUTH_DEACTIVATE_KEY:
4692 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4694 case SCTP_AUTO_ASCONF:
4695 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4697 case SCTP_PEER_ADDR_THLDS:
4698 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4701 case SCTP_PEER_ADDR_THLDS_V2:
4702 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4705 case SCTP_RECVRCVINFO:
4706 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4708 case SCTP_RECVNXTINFO:
4709 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4711 case SCTP_PR_SUPPORTED:
4712 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4714 case SCTP_DEFAULT_PRINFO:
4715 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4717 case SCTP_RECONFIG_SUPPORTED:
4718 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4720 case SCTP_ENABLE_STREAM_RESET:
4721 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4723 case SCTP_RESET_STREAMS:
4724 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4726 case SCTP_RESET_ASSOC:
4727 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4729 case SCTP_ADD_STREAMS:
4730 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4732 case SCTP_STREAM_SCHEDULER:
4733 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4735 case SCTP_STREAM_SCHEDULER_VALUE:
4736 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4738 case SCTP_INTERLEAVING_SUPPORTED:
4739 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4742 case SCTP_REUSE_PORT:
4743 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4746 retval = sctp_setsockopt_event(sk, kopt, optlen);
4748 case SCTP_ASCONF_SUPPORTED:
4749 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4751 case SCTP_AUTH_SUPPORTED:
4752 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4754 case SCTP_ECN_SUPPORTED:
4755 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4757 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4758 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4760 case SCTP_REMOTE_UDP_ENCAPS_PORT:
4761 retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4763 case SCTP_PLPMTUD_PROBE_INTERVAL:
4764 retval = sctp_setsockopt_probe_interval(sk, kopt, optlen);
4767 retval = -ENOPROTOOPT;
4776 /* API 3.1.6 connect() - UDP Style Syntax
4778 * An application may use the connect() call in the UDP model to initiate an
4779 * association without sending data.
4783 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4785 * sd: the socket descriptor to have a new association added to.
4787 * nam: the address structure (either struct sockaddr_in or struct
4788 * sockaddr_in6 defined in RFC2553 [7]).
4790 * len: the size of the address.
4792 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4793 int addr_len, int flags)
4799 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4802 /* Validate addr_len before calling common connect/connectx routine. */
4803 af = sctp_get_af_specific(addr->sa_family);
4804 if (af && addr_len >= af->sockaddr_len)
4805 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4811 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4812 int addr_len, int flags)
4814 if (addr_len < sizeof(uaddr->sa_family))
4817 if (uaddr->sa_family == AF_UNSPEC)
4820 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4823 /* FIXME: Write comments. */
4824 static int sctp_disconnect(struct sock *sk, int flags)
4826 return -EOPNOTSUPP; /* STUB */
4829 /* 4.1.4 accept() - TCP Style Syntax
4831 * Applications use accept() call to remove an established SCTP
4832 * association from the accept queue of the endpoint. A new socket
4833 * descriptor will be returned from accept() to represent the newly
4834 * formed association.
4836 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4838 struct sctp_sock *sp;
4839 struct sctp_endpoint *ep;
4840 struct sock *newsk = NULL;
4841 struct sctp_association *asoc;
4850 if (!sctp_style(sk, TCP)) {
4851 error = -EOPNOTSUPP;
4855 if (!sctp_sstate(sk, LISTENING)) {
4860 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4862 error = sctp_wait_for_accept(sk, timeo);
4866 /* We treat the list of associations on the endpoint as the accept
4867 * queue and pick the first association on the list.
4869 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4871 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4877 /* Populate the fields of the newsk from the oldsk and migrate the
4878 * asoc to the newsk.
4880 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4882 sk_common_release(newsk);
4892 /* The SCTP ioctl handler. */
4893 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4900 * SEQPACKET-style sockets in LISTENING state are valid, for
4901 * SCTP, so only discard TCP-style sockets in LISTENING state.
4903 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4908 struct sk_buff *skb;
4909 unsigned int amount = 0;
4911 skb = skb_peek(&sk->sk_receive_queue);
4914 * We will only return the amount of this packet since
4915 * that is all that will be read.
4919 rc = put_user(amount, (int __user *)arg);
4931 /* This is the function which gets called during socket creation to
4932 * initialized the SCTP-specific portion of the sock.
4933 * The sock structure should already be zero-filled memory.
4935 static int sctp_init_sock(struct sock *sk)
4937 struct net *net = sock_net(sk);
4938 struct sctp_sock *sp;
4940 pr_debug("%s: sk:%p\n", __func__, sk);
4944 /* Initialize the SCTP per socket area. */
4945 switch (sk->sk_type) {
4946 case SOCK_SEQPACKET:
4947 sp->type = SCTP_SOCKET_UDP;
4950 sp->type = SCTP_SOCKET_TCP;
4953 return -ESOCKTNOSUPPORT;
4956 sk->sk_gso_type = SKB_GSO_SCTP;
4958 /* Initialize default send parameters. These parameters can be
4959 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4961 sp->default_stream = 0;
4962 sp->default_ppid = 0;
4963 sp->default_flags = 0;
4964 sp->default_context = 0;
4965 sp->default_timetolive = 0;
4967 sp->default_rcv_context = 0;
4968 sp->max_burst = net->sctp.max_burst;
4970 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4972 /* Initialize default setup parameters. These parameters
4973 * can be modified with the SCTP_INITMSG socket option or
4974 * overridden by the SCTP_INIT CMSG.
4976 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4977 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4978 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4979 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4981 /* Initialize default RTO related parameters. These parameters can
4982 * be modified for with the SCTP_RTOINFO socket option.
4984 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4985 sp->rtoinfo.srto_max = net->sctp.rto_max;
4986 sp->rtoinfo.srto_min = net->sctp.rto_min;
4988 /* Initialize default association related parameters. These parameters
4989 * can be modified with the SCTP_ASSOCINFO socket option.
4991 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4992 sp->assocparams.sasoc_number_peer_destinations = 0;
4993 sp->assocparams.sasoc_peer_rwnd = 0;
4994 sp->assocparams.sasoc_local_rwnd = 0;
4995 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4997 /* Initialize default event subscriptions. By default, all the
5002 /* Default Peer Address Parameters. These defaults can
5003 * be modified via SCTP_PEER_ADDR_PARAMS
5005 sp->hbinterval = net->sctp.hb_interval;
5006 sp->udp_port = htons(net->sctp.udp_port);
5007 sp->encap_port = htons(net->sctp.encap_port);
5008 sp->pathmaxrxt = net->sctp.max_retrans_path;
5009 sp->pf_retrans = net->sctp.pf_retrans;
5010 sp->ps_retrans = net->sctp.ps_retrans;
5011 sp->pf_expose = net->sctp.pf_expose;
5012 sp->pathmtu = 0; /* allow default discovery */
5013 sp->sackdelay = net->sctp.sack_timeout;
5015 sp->param_flags = SPP_HB_ENABLE |
5017 SPP_SACKDELAY_ENABLE;
5018 sp->default_ss = SCTP_SS_DEFAULT;
5020 /* If enabled no SCTP message fragmentation will be performed.
5021 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5023 sp->disable_fragments = 0;
5025 /* Enable Nagle algorithm by default. */
5028 sp->recvrcvinfo = 0;
5029 sp->recvnxtinfo = 0;
5031 /* Enable by default. */
5034 /* Auto-close idle associations after the configured
5035 * number of seconds. A value of 0 disables this
5036 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5037 * for UDP-style sockets only.
5041 /* User specified fragmentation limit. */
5044 sp->adaptation_ind = 0;
5046 sp->pf = sctp_get_pf_specific(sk->sk_family);
5048 /* Control variables for partial data delivery. */
5049 atomic_set(&sp->pd_mode, 0);
5050 skb_queue_head_init(&sp->pd_lobby);
5051 sp->frag_interleave = 0;
5052 sp->probe_interval = net->sctp.probe_interval;
5054 /* Create a per socket endpoint structure. Even if we
5055 * change the data structure relationships, this may still
5056 * be useful for storing pre-connect address information.
5058 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5064 sk->sk_destruct = sctp_destruct_sock;
5066 SCTP_DBG_OBJCNT_INC(sock);
5068 sk_sockets_allocated_inc(sk);
5069 sock_prot_inuse_add(net, sk->sk_prot, 1);
5074 /* Cleanup any SCTP per socket resources. Must be called with
5075 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5077 static void sctp_destroy_sock(struct sock *sk)
5079 struct sctp_sock *sp;
5081 pr_debug("%s: sk:%p\n", __func__, sk);
5083 /* Release our hold on the endpoint. */
5085 /* This could happen during socket init, thus we bail out
5086 * early, since the rest of the below is not setup either.
5091 if (sp->do_auto_asconf) {
5092 sp->do_auto_asconf = 0;
5093 list_del(&sp->auto_asconf_list);
5095 sctp_endpoint_free(sp->ep);
5096 sk_sockets_allocated_dec(sk);
5097 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5100 /* Triggered when there are no references on the socket anymore */
5101 static void sctp_destruct_sock(struct sock *sk)
5103 struct sctp_sock *sp = sctp_sk(sk);
5105 /* Free up the HMAC transform. */
5106 crypto_free_shash(sp->hmac);
5108 inet_sock_destruct(sk);
5111 /* API 4.1.7 shutdown() - TCP Style Syntax
5112 * int shutdown(int socket, int how);
5114 * sd - the socket descriptor of the association to be closed.
5115 * how - Specifies the type of shutdown. The values are
5118 * Disables further receive operations. No SCTP
5119 * protocol action is taken.
5121 * Disables further send operations, and initiates
5122 * the SCTP shutdown sequence.
5124 * Disables further send and receive operations
5125 * and initiates the SCTP shutdown sequence.
5127 static void sctp_shutdown(struct sock *sk, int how)
5129 struct net *net = sock_net(sk);
5130 struct sctp_endpoint *ep;
5132 if (!sctp_style(sk, TCP))
5135 ep = sctp_sk(sk)->ep;
5136 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5137 struct sctp_association *asoc;
5139 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5140 asoc = list_entry(ep->asocs.next,
5141 struct sctp_association, asocs);
5142 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5146 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5147 struct sctp_info *info)
5149 struct sctp_transport *prim;
5150 struct list_head *pos;
5153 memset(info, 0, sizeof(*info));
5155 struct sctp_sock *sp = sctp_sk(sk);
5157 info->sctpi_s_autoclose = sp->autoclose;
5158 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5159 info->sctpi_s_pd_point = sp->pd_point;
5160 info->sctpi_s_nodelay = sp->nodelay;
5161 info->sctpi_s_disable_fragments = sp->disable_fragments;
5162 info->sctpi_s_v4mapped = sp->v4mapped;
5163 info->sctpi_s_frag_interleave = sp->frag_interleave;
5164 info->sctpi_s_type = sp->type;
5169 info->sctpi_tag = asoc->c.my_vtag;
5170 info->sctpi_state = asoc->state;
5171 info->sctpi_rwnd = asoc->a_rwnd;
5172 info->sctpi_unackdata = asoc->unack_data;
5173 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5174 info->sctpi_instrms = asoc->stream.incnt;
5175 info->sctpi_outstrms = asoc->stream.outcnt;
5176 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5177 info->sctpi_inqueue++;
5178 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5179 info->sctpi_outqueue++;
5180 info->sctpi_overall_error = asoc->overall_error_count;
5181 info->sctpi_max_burst = asoc->max_burst;
5182 info->sctpi_maxseg = asoc->frag_point;
5183 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5184 info->sctpi_peer_tag = asoc->c.peer_vtag;
5186 mask = asoc->peer.ecn_capable << 1;
5187 mask = (mask | asoc->peer.ipv4_address) << 1;
5188 mask = (mask | asoc->peer.ipv6_address) << 1;
5189 mask = (mask | asoc->peer.hostname_address) << 1;
5190 mask = (mask | asoc->peer.asconf_capable) << 1;
5191 mask = (mask | asoc->peer.prsctp_capable) << 1;
5192 mask = (mask | asoc->peer.auth_capable);
5193 info->sctpi_peer_capable = mask;
5194 mask = asoc->peer.sack_needed << 1;
5195 mask = (mask | asoc->peer.sack_generation) << 1;
5196 mask = (mask | asoc->peer.zero_window_announced);
5197 info->sctpi_peer_sack = mask;
5199 info->sctpi_isacks = asoc->stats.isacks;
5200 info->sctpi_osacks = asoc->stats.osacks;
5201 info->sctpi_opackets = asoc->stats.opackets;
5202 info->sctpi_ipackets = asoc->stats.ipackets;
5203 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5204 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5205 info->sctpi_idupchunks = asoc->stats.idupchunks;
5206 info->sctpi_gapcnt = asoc->stats.gapcnt;
5207 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5208 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5209 info->sctpi_oodchunks = asoc->stats.oodchunks;
5210 info->sctpi_iodchunks = asoc->stats.iodchunks;
5211 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5212 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5214 prim = asoc->peer.primary_path;
5215 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5216 info->sctpi_p_state = prim->state;
5217 info->sctpi_p_cwnd = prim->cwnd;
5218 info->sctpi_p_srtt = prim->srtt;
5219 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5220 info->sctpi_p_hbinterval = prim->hbinterval;
5221 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5222 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5223 info->sctpi_p_ssthresh = prim->ssthresh;
5224 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5225 info->sctpi_p_flight_size = prim->flight_size;
5226 info->sctpi_p_error = prim->error_count;
5230 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5232 /* use callback to avoid exporting the core structure */
5233 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5235 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5237 rhashtable_walk_start(iter);
5240 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5242 rhashtable_walk_stop(iter);
5243 rhashtable_walk_exit(iter);
5246 struct sctp_transport *sctp_transport_get_next(struct net *net,
5247 struct rhashtable_iter *iter)
5249 struct sctp_transport *t;
5251 t = rhashtable_walk_next(iter);
5252 for (; t; t = rhashtable_walk_next(iter)) {
5254 if (PTR_ERR(t) == -EAGAIN)
5259 if (!sctp_transport_hold(t))
5262 if (net_eq(t->asoc->base.net, net) &&
5263 t->asoc->peer.primary_path == t)
5266 sctp_transport_put(t);
5272 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5273 struct rhashtable_iter *iter,
5276 struct sctp_transport *t;
5279 return SEQ_START_TOKEN;
5281 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5284 sctp_transport_put(t);
5290 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5294 struct sctp_endpoint *ep;
5295 struct sctp_hashbucket *head;
5297 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5299 read_lock_bh(&head->lock);
5300 sctp_for_each_hentry(ep, &head->chain) {
5305 read_unlock_bh(&head->lock);
5310 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5312 int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5313 const union sctp_addr *laddr,
5314 const union sctp_addr *paddr, void *p)
5316 struct sctp_transport *transport;
5317 struct sctp_endpoint *ep;
5321 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5326 ep = transport->asoc->ep;
5327 if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5328 sctp_transport_put(transport);
5334 err = cb(ep, transport, p);
5335 sctp_endpoint_put(ep);
5336 sctp_transport_put(transport);
5339 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5341 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5342 struct net *net, int *pos, void *p)
5344 struct rhashtable_iter hti;
5345 struct sctp_transport *tsp;
5346 struct sctp_endpoint *ep;
5351 sctp_transport_walk_start(&hti);
5353 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5354 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5356 if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5357 ret = cb(ep, tsp, p);
5360 sctp_endpoint_put(ep);
5363 sctp_transport_put(tsp);
5365 sctp_transport_walk_stop(&hti);
5368 if (cb_done && !cb_done(ep, tsp, p)) {
5370 sctp_endpoint_put(ep);
5371 sctp_transport_put(tsp);
5374 sctp_endpoint_put(ep);
5375 sctp_transport_put(tsp);
5380 EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5382 /* 7.2.1 Association Status (SCTP_STATUS)
5384 * Applications can retrieve current status information about an
5385 * association, including association state, peer receiver window size,
5386 * number of unacked data chunks, and number of data chunks pending
5387 * receipt. This information is read-only.
5389 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5390 char __user *optval,
5393 struct sctp_status status;
5394 struct sctp_association *asoc = NULL;
5395 struct sctp_transport *transport;
5396 sctp_assoc_t associd;
5399 if (len < sizeof(status)) {
5404 len = sizeof(status);
5405 if (copy_from_user(&status, optval, len)) {
5410 associd = status.sstat_assoc_id;
5411 asoc = sctp_id2assoc(sk, associd);
5417 transport = asoc->peer.primary_path;
5419 status.sstat_assoc_id = sctp_assoc2id(asoc);
5420 status.sstat_state = sctp_assoc_to_state(asoc);
5421 status.sstat_rwnd = asoc->peer.rwnd;
5422 status.sstat_unackdata = asoc->unack_data;
5424 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5425 status.sstat_instrms = asoc->stream.incnt;
5426 status.sstat_outstrms = asoc->stream.outcnt;
5427 status.sstat_fragmentation_point = asoc->frag_point;
5428 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5429 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5430 transport->af_specific->sockaddr_len);
5431 /* Map ipv4 address into v4-mapped-on-v6 address. */
5432 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5433 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5434 status.sstat_primary.spinfo_state = transport->state;
5435 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5436 status.sstat_primary.spinfo_srtt = transport->srtt;
5437 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5438 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5440 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5441 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5443 if (put_user(len, optlen)) {
5448 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5449 __func__, len, status.sstat_state, status.sstat_rwnd,
5450 status.sstat_assoc_id);
5452 if (copy_to_user(optval, &status, len)) {
5462 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5464 * Applications can retrieve information about a specific peer address
5465 * of an association, including its reachability state, congestion
5466 * window, and retransmission timer values. This information is
5469 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5470 char __user *optval,
5473 struct sctp_paddrinfo pinfo;
5474 struct sctp_transport *transport;
5477 if (len < sizeof(pinfo)) {
5482 len = sizeof(pinfo);
5483 if (copy_from_user(&pinfo, optval, len)) {
5488 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5489 pinfo.spinfo_assoc_id);
5495 if (transport->state == SCTP_PF &&
5496 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5501 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5502 pinfo.spinfo_state = transport->state;
5503 pinfo.spinfo_cwnd = transport->cwnd;
5504 pinfo.spinfo_srtt = transport->srtt;
5505 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5506 pinfo.spinfo_mtu = transport->pathmtu;
5508 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5509 pinfo.spinfo_state = SCTP_ACTIVE;
5511 if (put_user(len, optlen)) {
5516 if (copy_to_user(optval, &pinfo, len)) {
5525 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5527 * This option is a on/off flag. If enabled no SCTP message
5528 * fragmentation will be performed. Instead if a message being sent
5529 * exceeds the current PMTU size, the message will NOT be sent and
5530 * instead a error will be indicated to the user.
5532 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5533 char __user *optval, int __user *optlen)
5537 if (len < sizeof(int))
5541 val = (sctp_sk(sk)->disable_fragments == 1);
5542 if (put_user(len, optlen))
5544 if (copy_to_user(optval, &val, len))
5549 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5551 * This socket option is used to specify various notifications and
5552 * ancillary data the user wishes to receive.
5554 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5557 struct sctp_event_subscribe subscribe;
5558 __u8 *sn_type = (__u8 *)&subscribe;
5563 if (len > sizeof(struct sctp_event_subscribe))
5564 len = sizeof(struct sctp_event_subscribe);
5565 if (put_user(len, optlen))
5568 for (i = 0; i < len; i++)
5569 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5570 SCTP_SN_TYPE_BASE + i);
5572 if (copy_to_user(optval, &subscribe, len))
5578 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5580 * This socket option is applicable to the UDP-style socket only. When
5581 * set it will cause associations that are idle for more than the
5582 * specified number of seconds to automatically close. An association
5583 * being idle is defined an association that has NOT sent or received
5584 * user data. The special value of '0' indicates that no automatic
5585 * close of any associations should be performed. The option expects an
5586 * integer defining the number of seconds of idle time before an
5587 * association is closed.
5589 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5591 /* Applicable to UDP-style socket only */
5592 if (sctp_style(sk, TCP))
5594 if (len < sizeof(int))
5597 if (put_user(len, optlen))
5599 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5604 /* Helper routine to branch off an association to a new socket. */
5605 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5607 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5608 struct sctp_sock *sp = sctp_sk(sk);
5609 struct socket *sock;
5612 /* Do not peel off from one netns to another one. */
5613 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5619 /* An association cannot be branched off from an already peeled-off
5620 * socket, nor is this supported for tcp style sockets.
5622 if (!sctp_style(sk, UDP))
5625 /* Create a new socket. */
5626 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5630 sctp_copy_sock(sock->sk, sk, asoc);
5632 /* Make peeled-off sockets more like 1-1 accepted sockets.
5633 * Set the daddr and initialize id to something more random and also
5634 * copy over any ip options.
5636 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5637 sp->pf->copy_ip_options(sk, sock->sk);
5639 /* Populate the fields of the newsk from the oldsk and migrate the
5640 * asoc to the newsk.
5642 err = sctp_sock_migrate(sk, sock->sk, asoc,
5643 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5653 EXPORT_SYMBOL(sctp_do_peeloff);
5655 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5656 struct file **newfile, unsigned flags)
5658 struct socket *newsock;
5661 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5665 /* Map the socket to an unused fd that can be returned to the user. */
5666 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5668 sock_release(newsock);
5672 *newfile = sock_alloc_file(newsock, 0, NULL);
5673 if (IS_ERR(*newfile)) {
5674 put_unused_fd(retval);
5675 retval = PTR_ERR(*newfile);
5680 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5683 peeloff->sd = retval;
5685 if (flags & SOCK_NONBLOCK)
5686 (*newfile)->f_flags |= O_NONBLOCK;
5691 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5693 sctp_peeloff_arg_t peeloff;
5694 struct file *newfile = NULL;
5697 if (len < sizeof(sctp_peeloff_arg_t))
5699 len = sizeof(sctp_peeloff_arg_t);
5700 if (copy_from_user(&peeloff, optval, len))
5703 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5707 /* Return the fd mapped to the new socket. */
5708 if (put_user(len, optlen)) {
5710 put_unused_fd(retval);
5714 if (copy_to_user(optval, &peeloff, len)) {
5716 put_unused_fd(retval);
5719 fd_install(retval, newfile);
5724 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5725 char __user *optval, int __user *optlen)
5727 sctp_peeloff_flags_arg_t peeloff;
5728 struct file *newfile = NULL;
5731 if (len < sizeof(sctp_peeloff_flags_arg_t))
5733 len = sizeof(sctp_peeloff_flags_arg_t);
5734 if (copy_from_user(&peeloff, optval, len))
5737 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5738 &newfile, peeloff.flags);
5742 /* Return the fd mapped to the new socket. */
5743 if (put_user(len, optlen)) {
5745 put_unused_fd(retval);
5749 if (copy_to_user(optval, &peeloff, len)) {
5751 put_unused_fd(retval);
5754 fd_install(retval, newfile);
5759 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5761 * Applications can enable or disable heartbeats for any peer address of
5762 * an association, modify an address's heartbeat interval, force a
5763 * heartbeat to be sent immediately, and adjust the address's maximum
5764 * number of retransmissions sent before an address is considered
5765 * unreachable. The following structure is used to access and modify an
5766 * address's parameters:
5768 * struct sctp_paddrparams {
5769 * sctp_assoc_t spp_assoc_id;
5770 * struct sockaddr_storage spp_address;
5771 * uint32_t spp_hbinterval;
5772 * uint16_t spp_pathmaxrxt;
5773 * uint32_t spp_pathmtu;
5774 * uint32_t spp_sackdelay;
5775 * uint32_t spp_flags;
5778 * spp_assoc_id - (one-to-many style socket) This is filled in the
5779 * application, and identifies the association for
5781 * spp_address - This specifies which address is of interest.
5782 * spp_hbinterval - This contains the value of the heartbeat interval,
5783 * in milliseconds. If a value of zero
5784 * is present in this field then no changes are to
5785 * be made to this parameter.
5786 * spp_pathmaxrxt - This contains the maximum number of
5787 * retransmissions before this address shall be
5788 * considered unreachable. If a value of zero
5789 * is present in this field then no changes are to
5790 * be made to this parameter.
5791 * spp_pathmtu - When Path MTU discovery is disabled the value
5792 * specified here will be the "fixed" path mtu.
5793 * Note that if the spp_address field is empty
5794 * then all associations on this address will
5795 * have this fixed path mtu set upon them.
5797 * spp_sackdelay - When delayed sack is enabled, this value specifies
5798 * the number of milliseconds that sacks will be delayed
5799 * for. This value will apply to all addresses of an
5800 * association if the spp_address field is empty. Note
5801 * also, that if delayed sack is enabled and this
5802 * value is set to 0, no change is made to the last
5803 * recorded delayed sack timer value.
5805 * spp_flags - These flags are used to control various features
5806 * on an association. The flag field may contain
5807 * zero or more of the following options.
5809 * SPP_HB_ENABLE - Enable heartbeats on the
5810 * specified address. Note that if the address
5811 * field is empty all addresses for the association
5812 * have heartbeats enabled upon them.
5814 * SPP_HB_DISABLE - Disable heartbeats on the
5815 * speicifed address. Note that if the address
5816 * field is empty all addresses for the association
5817 * will have their heartbeats disabled. Note also
5818 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5819 * mutually exclusive, only one of these two should
5820 * be specified. Enabling both fields will have
5821 * undetermined results.
5823 * SPP_HB_DEMAND - Request a user initiated heartbeat
5824 * to be made immediately.
5826 * SPP_PMTUD_ENABLE - This field will enable PMTU
5827 * discovery upon the specified address. Note that
5828 * if the address feild is empty then all addresses
5829 * on the association are effected.
5831 * SPP_PMTUD_DISABLE - This field will disable PMTU
5832 * discovery upon the specified address. Note that
5833 * if the address feild is empty then all addresses
5834 * on the association are effected. Not also that
5835 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5836 * exclusive. Enabling both will have undetermined
5839 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5840 * on delayed sack. The time specified in spp_sackdelay
5841 * is used to specify the sack delay for this address. Note
5842 * that if spp_address is empty then all addresses will
5843 * enable delayed sack and take on the sack delay
5844 * value specified in spp_sackdelay.
5845 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5846 * off delayed sack. If the spp_address field is blank then
5847 * delayed sack is disabled for the entire association. Note
5848 * also that this field is mutually exclusive to
5849 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5852 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5853 * setting of the IPV6 flow label value. The value is
5854 * contained in the spp_ipv6_flowlabel field.
5855 * Upon retrieval, this flag will be set to indicate that
5856 * the spp_ipv6_flowlabel field has a valid value returned.
5857 * If a specific destination address is set (in the
5858 * spp_address field), then the value returned is that of
5859 * the address. If just an association is specified (and
5860 * no address), then the association's default flow label
5861 * is returned. If neither an association nor a destination
5862 * is specified, then the socket's default flow label is
5863 * returned. For non-IPv6 sockets, this flag will be left
5866 * SPP_DSCP: Setting this flag enables the setting of the
5867 * Differentiated Services Code Point (DSCP) value
5868 * associated with either the association or a specific
5869 * address. The value is obtained in the spp_dscp field.
5870 * Upon retrieval, this flag will be set to indicate that
5871 * the spp_dscp field has a valid value returned. If a
5872 * specific destination address is set when called (in the
5873 * spp_address field), then that specific destination
5874 * address's DSCP value is returned. If just an association
5875 * is specified, then the association's default DSCP is
5876 * returned. If neither an association nor a destination is
5877 * specified, then the socket's default DSCP is returned.
5879 * spp_ipv6_flowlabel
5880 * - This field is used in conjunction with the
5881 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5882 * The 20 least significant bits are used for the flow
5883 * label. This setting has precedence over any IPv6-layer
5886 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5887 * and contains the DSCP. The 6 most significant bits are
5888 * used for the DSCP. This setting has precedence over any
5889 * IPv4- or IPv6- layer setting.
5891 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5892 char __user *optval, int __user *optlen)
5894 struct sctp_paddrparams params;
5895 struct sctp_transport *trans = NULL;
5896 struct sctp_association *asoc = NULL;
5897 struct sctp_sock *sp = sctp_sk(sk);
5899 if (len >= sizeof(params))
5900 len = sizeof(params);
5901 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5902 spp_ipv6_flowlabel), 4))
5903 len = ALIGN(offsetof(struct sctp_paddrparams,
5904 spp_ipv6_flowlabel), 4);
5908 if (copy_from_user(¶ms, optval, len))
5911 /* If an address other than INADDR_ANY is specified, and
5912 * no transport is found, then the request is invalid.
5914 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5915 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5916 params.spp_assoc_id);
5918 pr_debug("%s: failed no transport\n", __func__);
5923 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5924 * socket is a one to many style socket, and an association
5925 * was not found, then the id was invalid.
5927 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5928 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5929 sctp_style(sk, UDP)) {
5930 pr_debug("%s: failed no association\n", __func__);
5935 /* Fetch transport values. */
5936 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5937 params.spp_pathmtu = trans->pathmtu;
5938 params.spp_pathmaxrxt = trans->pathmaxrxt;
5939 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5941 /*draft-11 doesn't say what to return in spp_flags*/
5942 params.spp_flags = trans->param_flags;
5943 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5944 params.spp_ipv6_flowlabel = trans->flowlabel &
5945 SCTP_FLOWLABEL_VAL_MASK;
5946 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5948 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5949 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5950 params.spp_flags |= SPP_DSCP;
5953 /* Fetch association values. */
5954 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5955 params.spp_pathmtu = asoc->pathmtu;
5956 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5957 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5959 /*draft-11 doesn't say what to return in spp_flags*/
5960 params.spp_flags = asoc->param_flags;
5961 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5962 params.spp_ipv6_flowlabel = asoc->flowlabel &
5963 SCTP_FLOWLABEL_VAL_MASK;
5964 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5966 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5967 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5968 params.spp_flags |= SPP_DSCP;
5971 /* Fetch socket values. */
5972 params.spp_hbinterval = sp->hbinterval;
5973 params.spp_pathmtu = sp->pathmtu;
5974 params.spp_sackdelay = sp->sackdelay;
5975 params.spp_pathmaxrxt = sp->pathmaxrxt;
5977 /*draft-11 doesn't say what to return in spp_flags*/
5978 params.spp_flags = sp->param_flags;
5979 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5980 params.spp_ipv6_flowlabel = sp->flowlabel &
5981 SCTP_FLOWLABEL_VAL_MASK;
5982 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5984 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5985 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5986 params.spp_flags |= SPP_DSCP;
5990 if (copy_to_user(optval, ¶ms, len))
5993 if (put_user(len, optlen))
6000 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6002 * This option will effect the way delayed acks are performed. This
6003 * option allows you to get or set the delayed ack time, in
6004 * milliseconds. It also allows changing the delayed ack frequency.
6005 * Changing the frequency to 1 disables the delayed sack algorithm. If
6006 * the assoc_id is 0, then this sets or gets the endpoints default
6007 * values. If the assoc_id field is non-zero, then the set or get
6008 * effects the specified association for the one to many model (the
6009 * assoc_id field is ignored by the one to one model). Note that if
6010 * sack_delay or sack_freq are 0 when setting this option, then the
6011 * current values will remain unchanged.
6013 * struct sctp_sack_info {
6014 * sctp_assoc_t sack_assoc_id;
6015 * uint32_t sack_delay;
6016 * uint32_t sack_freq;
6019 * sack_assoc_id - This parameter, indicates which association the user
6020 * is performing an action upon. Note that if this field's value is
6021 * zero then the endpoints default value is changed (effecting future
6022 * associations only).
6024 * sack_delay - This parameter contains the number of milliseconds that
6025 * the user is requesting the delayed ACK timer be set to. Note that
6026 * this value is defined in the standard to be between 200 and 500
6029 * sack_freq - This parameter contains the number of packets that must
6030 * be received before a sack is sent without waiting for the delay
6031 * timer to expire. The default value for this is 2, setting this
6032 * value to 1 will disable the delayed sack algorithm.
6034 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6035 char __user *optval,
6038 struct sctp_sack_info params;
6039 struct sctp_association *asoc = NULL;
6040 struct sctp_sock *sp = sctp_sk(sk);
6042 if (len >= sizeof(struct sctp_sack_info)) {
6043 len = sizeof(struct sctp_sack_info);
6045 if (copy_from_user(¶ms, optval, len))
6047 } else if (len == sizeof(struct sctp_assoc_value)) {
6048 pr_warn_ratelimited(DEPRECATED
6050 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6051 "Use struct sctp_sack_info instead\n",
6052 current->comm, task_pid_nr(current));
6053 if (copy_from_user(¶ms, optval, len))
6058 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6059 * socket is a one to many style socket, and an association
6060 * was not found, then the id was invalid.
6062 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6063 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6064 sctp_style(sk, UDP))
6068 /* Fetch association values. */
6069 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6070 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6071 params.sack_freq = asoc->sackfreq;
6074 params.sack_delay = 0;
6075 params.sack_freq = 1;
6078 /* Fetch socket values. */
6079 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6080 params.sack_delay = sp->sackdelay;
6081 params.sack_freq = sp->sackfreq;
6083 params.sack_delay = 0;
6084 params.sack_freq = 1;
6088 if (copy_to_user(optval, ¶ms, len))
6091 if (put_user(len, optlen))
6097 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6099 * Applications can specify protocol parameters for the default association
6100 * initialization. The option name argument to setsockopt() and getsockopt()
6103 * Setting initialization parameters is effective only on an unconnected
6104 * socket (for UDP-style sockets only future associations are effected
6105 * by the change). With TCP-style sockets, this option is inherited by
6106 * sockets derived from a listener socket.
6108 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6110 if (len < sizeof(struct sctp_initmsg))
6112 len = sizeof(struct sctp_initmsg);
6113 if (put_user(len, optlen))
6115 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6121 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6122 char __user *optval, int __user *optlen)
6124 struct sctp_association *asoc;
6126 struct sctp_getaddrs getaddrs;
6127 struct sctp_transport *from;
6129 union sctp_addr temp;
6130 struct sctp_sock *sp = sctp_sk(sk);
6135 if (len < sizeof(struct sctp_getaddrs))
6138 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6141 /* For UDP-style sockets, id specifies the association to query. */
6142 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6146 to = optval + offsetof(struct sctp_getaddrs, addrs);
6147 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6149 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6151 memcpy(&temp, &from->ipaddr, sizeof(temp));
6152 addrlen = sctp_get_pf_specific(sk->sk_family)
6153 ->addr_to_user(sp, &temp);
6154 if (space_left < addrlen)
6156 if (copy_to_user(to, &temp, addrlen))
6160 space_left -= addrlen;
6163 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6165 bytes_copied = ((char __user *)to) - optval;
6166 if (put_user(bytes_copied, optlen))
6172 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6173 size_t space_left, int *bytes_copied)
6175 struct sctp_sockaddr_entry *addr;
6176 union sctp_addr temp;
6179 struct net *net = sock_net(sk);
6182 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6186 if ((PF_INET == sk->sk_family) &&
6187 (AF_INET6 == addr->a.sa.sa_family))
6189 if ((PF_INET6 == sk->sk_family) &&
6190 inet_v6_ipv6only(sk) &&
6191 (AF_INET == addr->a.sa.sa_family))
6193 memcpy(&temp, &addr->a, sizeof(temp));
6194 if (!temp.v4.sin_port)
6195 temp.v4.sin_port = htons(port);
6197 addrlen = sctp_get_pf_specific(sk->sk_family)
6198 ->addr_to_user(sctp_sk(sk), &temp);
6200 if (space_left < addrlen) {
6204 memcpy(to, &temp, addrlen);
6208 space_left -= addrlen;
6209 *bytes_copied += addrlen;
6217 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6218 char __user *optval, int __user *optlen)
6220 struct sctp_bind_addr *bp;
6221 struct sctp_association *asoc;
6223 struct sctp_getaddrs getaddrs;
6224 struct sctp_sockaddr_entry *addr;
6226 union sctp_addr temp;
6227 struct sctp_sock *sp = sctp_sk(sk);
6231 int bytes_copied = 0;
6235 if (len < sizeof(struct sctp_getaddrs))
6238 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6242 * For UDP-style sockets, id specifies the association to query.
6243 * If the id field is set to the value '0' then the locally bound
6244 * addresses are returned without regard to any particular
6247 if (0 == getaddrs.assoc_id) {
6248 bp = &sctp_sk(sk)->ep->base.bind_addr;
6250 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6253 bp = &asoc->base.bind_addr;
6256 to = optval + offsetof(struct sctp_getaddrs, addrs);
6257 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6259 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6263 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6264 * addresses from the global local address list.
6266 if (sctp_list_single_entry(&bp->address_list)) {
6267 addr = list_entry(bp->address_list.next,
6268 struct sctp_sockaddr_entry, list);
6269 if (sctp_is_any(sk, &addr->a)) {
6270 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6271 space_left, &bytes_copied);
6281 /* Protection on the bound address list is not needed since
6282 * in the socket option context we hold a socket lock and
6283 * thus the bound address list can't change.
6285 list_for_each_entry(addr, &bp->address_list, list) {
6286 memcpy(&temp, &addr->a, sizeof(temp));
6287 addrlen = sctp_get_pf_specific(sk->sk_family)
6288 ->addr_to_user(sp, &temp);
6289 if (space_left < addrlen) {
6290 err = -ENOMEM; /*fixme: right error?*/
6293 memcpy(buf, &temp, addrlen);
6295 bytes_copied += addrlen;
6297 space_left -= addrlen;
6301 if (copy_to_user(to, addrs, bytes_copied)) {
6305 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6309 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6310 * but we can't change it anymore.
6312 if (put_user(bytes_copied, optlen))
6319 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6321 * Requests that the local SCTP stack use the enclosed peer address as
6322 * the association primary. The enclosed address must be one of the
6323 * association peer's addresses.
6325 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6326 char __user *optval, int __user *optlen)
6328 struct sctp_prim prim;
6329 struct sctp_association *asoc;
6330 struct sctp_sock *sp = sctp_sk(sk);
6332 if (len < sizeof(struct sctp_prim))
6335 len = sizeof(struct sctp_prim);
6337 if (copy_from_user(&prim, optval, len))
6340 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6344 if (!asoc->peer.primary_path)
6347 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6348 asoc->peer.primary_path->af_specific->sockaddr_len);
6350 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6351 (union sctp_addr *)&prim.ssp_addr);
6353 if (put_user(len, optlen))
6355 if (copy_to_user(optval, &prim, len))
6362 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6364 * Requests that the local endpoint set the specified Adaptation Layer
6365 * Indication parameter for all future INIT and INIT-ACK exchanges.
6367 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6368 char __user *optval, int __user *optlen)
6370 struct sctp_setadaptation adaptation;
6372 if (len < sizeof(struct sctp_setadaptation))
6375 len = sizeof(struct sctp_setadaptation);
6377 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6379 if (put_user(len, optlen))
6381 if (copy_to_user(optval, &adaptation, len))
6389 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6391 * Applications that wish to use the sendto() system call may wish to
6392 * specify a default set of parameters that would normally be supplied
6393 * through the inclusion of ancillary data. This socket option allows
6394 * such an application to set the default sctp_sndrcvinfo structure.
6397 * The application that wishes to use this socket option simply passes
6398 * in to this call the sctp_sndrcvinfo structure defined in Section
6399 * 5.2.2) The input parameters accepted by this call include
6400 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6401 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6402 * to this call if the caller is using the UDP model.
6404 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6406 static int sctp_getsockopt_default_send_param(struct sock *sk,
6407 int len, char __user *optval,
6410 struct sctp_sock *sp = sctp_sk(sk);
6411 struct sctp_association *asoc;
6412 struct sctp_sndrcvinfo info;
6414 if (len < sizeof(info))
6419 if (copy_from_user(&info, optval, len))
6422 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6423 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6424 sctp_style(sk, UDP))
6428 info.sinfo_stream = asoc->default_stream;
6429 info.sinfo_flags = asoc->default_flags;
6430 info.sinfo_ppid = asoc->default_ppid;
6431 info.sinfo_context = asoc->default_context;
6432 info.sinfo_timetolive = asoc->default_timetolive;
6434 info.sinfo_stream = sp->default_stream;
6435 info.sinfo_flags = sp->default_flags;
6436 info.sinfo_ppid = sp->default_ppid;
6437 info.sinfo_context = sp->default_context;
6438 info.sinfo_timetolive = sp->default_timetolive;
6441 if (put_user(len, optlen))
6443 if (copy_to_user(optval, &info, len))
6449 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6450 * (SCTP_DEFAULT_SNDINFO)
6452 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6453 char __user *optval,
6456 struct sctp_sock *sp = sctp_sk(sk);
6457 struct sctp_association *asoc;
6458 struct sctp_sndinfo info;
6460 if (len < sizeof(info))
6465 if (copy_from_user(&info, optval, len))
6468 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6469 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6470 sctp_style(sk, UDP))
6474 info.snd_sid = asoc->default_stream;
6475 info.snd_flags = asoc->default_flags;
6476 info.snd_ppid = asoc->default_ppid;
6477 info.snd_context = asoc->default_context;
6479 info.snd_sid = sp->default_stream;
6480 info.snd_flags = sp->default_flags;
6481 info.snd_ppid = sp->default_ppid;
6482 info.snd_context = sp->default_context;
6485 if (put_user(len, optlen))
6487 if (copy_to_user(optval, &info, len))
6495 * 7.1.5 SCTP_NODELAY
6497 * Turn on/off any Nagle-like algorithm. This means that packets are
6498 * generally sent as soon as possible and no unnecessary delays are
6499 * introduced, at the cost of more packets in the network. Expects an
6500 * integer boolean flag.
6503 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6504 char __user *optval, int __user *optlen)
6508 if (len < sizeof(int))
6512 val = (sctp_sk(sk)->nodelay == 1);
6513 if (put_user(len, optlen))
6515 if (copy_to_user(optval, &val, len))
6522 * 7.1.1 SCTP_RTOINFO
6524 * The protocol parameters used to initialize and bound retransmission
6525 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6526 * and modify these parameters.
6527 * All parameters are time values, in milliseconds. A value of 0, when
6528 * modifying the parameters, indicates that the current value should not
6532 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6533 char __user *optval,
6534 int __user *optlen) {
6535 struct sctp_rtoinfo rtoinfo;
6536 struct sctp_association *asoc;
6538 if (len < sizeof (struct sctp_rtoinfo))
6541 len = sizeof(struct sctp_rtoinfo);
6543 if (copy_from_user(&rtoinfo, optval, len))
6546 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6548 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6549 sctp_style(sk, UDP))
6552 /* Values corresponding to the specific association. */
6554 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6555 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6556 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6558 /* Values corresponding to the endpoint. */
6559 struct sctp_sock *sp = sctp_sk(sk);
6561 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6562 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6563 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6566 if (put_user(len, optlen))
6569 if (copy_to_user(optval, &rtoinfo, len))
6577 * 7.1.2 SCTP_ASSOCINFO
6579 * This option is used to tune the maximum retransmission attempts
6580 * of the association.
6581 * Returns an error if the new association retransmission value is
6582 * greater than the sum of the retransmission value of the peer.
6583 * See [SCTP] for more information.
6586 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6587 char __user *optval,
6591 struct sctp_assocparams assocparams;
6592 struct sctp_association *asoc;
6593 struct list_head *pos;
6596 if (len < sizeof (struct sctp_assocparams))
6599 len = sizeof(struct sctp_assocparams);
6601 if (copy_from_user(&assocparams, optval, len))
6604 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6606 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6607 sctp_style(sk, UDP))
6610 /* Values correspoinding to the specific association */
6612 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6613 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6614 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6615 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6617 list_for_each(pos, &asoc->peer.transport_addr_list) {
6621 assocparams.sasoc_number_peer_destinations = cnt;
6623 /* Values corresponding to the endpoint */
6624 struct sctp_sock *sp = sctp_sk(sk);
6626 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6627 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6628 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6629 assocparams.sasoc_cookie_life =
6630 sp->assocparams.sasoc_cookie_life;
6631 assocparams.sasoc_number_peer_destinations =
6633 sasoc_number_peer_destinations;
6636 if (put_user(len, optlen))
6639 if (copy_to_user(optval, &assocparams, len))
6646 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6648 * This socket option is a boolean flag which turns on or off mapped V4
6649 * addresses. If this option is turned on and the socket is type
6650 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6651 * If this option is turned off, then no mapping will be done of V4
6652 * addresses and a user will receive both PF_INET6 and PF_INET type
6653 * addresses on the socket.
6655 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6656 char __user *optval, int __user *optlen)
6659 struct sctp_sock *sp = sctp_sk(sk);
6661 if (len < sizeof(int))
6666 if (put_user(len, optlen))
6668 if (copy_to_user(optval, &val, len))
6675 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6676 * (chapter and verse is quoted at sctp_setsockopt_context())
6678 static int sctp_getsockopt_context(struct sock *sk, int len,
6679 char __user *optval, int __user *optlen)
6681 struct sctp_assoc_value params;
6682 struct sctp_association *asoc;
6684 if (len < sizeof(struct sctp_assoc_value))
6687 len = sizeof(struct sctp_assoc_value);
6689 if (copy_from_user(¶ms, optval, len))
6692 asoc = sctp_id2assoc(sk, params.assoc_id);
6693 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6694 sctp_style(sk, UDP))
6697 params.assoc_value = asoc ? asoc->default_rcv_context
6698 : sctp_sk(sk)->default_rcv_context;
6700 if (put_user(len, optlen))
6702 if (copy_to_user(optval, ¶ms, len))
6709 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6710 * This option will get or set the maximum size to put in any outgoing
6711 * SCTP DATA chunk. If a message is larger than this size it will be
6712 * fragmented by SCTP into the specified size. Note that the underlying
6713 * SCTP implementation may fragment into smaller sized chunks when the
6714 * PMTU of the underlying association is smaller than the value set by
6715 * the user. The default value for this option is '0' which indicates
6716 * the user is NOT limiting fragmentation and only the PMTU will effect
6717 * SCTP's choice of DATA chunk size. Note also that values set larger
6718 * than the maximum size of an IP datagram will effectively let SCTP
6719 * control fragmentation (i.e. the same as setting this option to 0).
6721 * The following structure is used to access and modify this parameter:
6723 * struct sctp_assoc_value {
6724 * sctp_assoc_t assoc_id;
6725 * uint32_t assoc_value;
6728 * assoc_id: This parameter is ignored for one-to-one style sockets.
6729 * For one-to-many style sockets this parameter indicates which
6730 * association the user is performing an action upon. Note that if
6731 * this field's value is zero then the endpoints default value is
6732 * changed (effecting future associations only).
6733 * assoc_value: This parameter specifies the maximum size in bytes.
6735 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6736 char __user *optval, int __user *optlen)
6738 struct sctp_assoc_value params;
6739 struct sctp_association *asoc;
6741 if (len == sizeof(int)) {
6742 pr_warn_ratelimited(DEPRECATED
6744 "Use of int in maxseg socket option.\n"
6745 "Use struct sctp_assoc_value instead\n",
6746 current->comm, task_pid_nr(current));
6747 params.assoc_id = SCTP_FUTURE_ASSOC;
6748 } else if (len >= sizeof(struct sctp_assoc_value)) {
6749 len = sizeof(struct sctp_assoc_value);
6750 if (copy_from_user(¶ms, optval, len))
6755 asoc = sctp_id2assoc(sk, params.assoc_id);
6756 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6757 sctp_style(sk, UDP))
6761 params.assoc_value = asoc->frag_point;
6763 params.assoc_value = sctp_sk(sk)->user_frag;
6765 if (put_user(len, optlen))
6767 if (len == sizeof(int)) {
6768 if (copy_to_user(optval, ¶ms.assoc_value, len))
6771 if (copy_to_user(optval, ¶ms, len))
6779 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6780 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6782 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6783 char __user *optval, int __user *optlen)
6787 if (len < sizeof(int))
6792 val = sctp_sk(sk)->frag_interleave;
6793 if (put_user(len, optlen))
6795 if (copy_to_user(optval, &val, len))
6802 * 7.1.25. Set or Get the sctp partial delivery point
6803 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6805 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6806 char __user *optval,
6811 if (len < sizeof(u32))
6816 val = sctp_sk(sk)->pd_point;
6817 if (put_user(len, optlen))
6819 if (copy_to_user(optval, &val, len))
6826 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6827 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6829 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6830 char __user *optval,
6833 struct sctp_assoc_value params;
6834 struct sctp_association *asoc;
6836 if (len == sizeof(int)) {
6837 pr_warn_ratelimited(DEPRECATED
6839 "Use of int in max_burst socket option.\n"
6840 "Use struct sctp_assoc_value instead\n",
6841 current->comm, task_pid_nr(current));
6842 params.assoc_id = SCTP_FUTURE_ASSOC;
6843 } else if (len >= sizeof(struct sctp_assoc_value)) {
6844 len = sizeof(struct sctp_assoc_value);
6845 if (copy_from_user(¶ms, optval, len))
6850 asoc = sctp_id2assoc(sk, params.assoc_id);
6851 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6852 sctp_style(sk, UDP))
6855 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6857 if (len == sizeof(int)) {
6858 if (copy_to_user(optval, ¶ms.assoc_value, len))
6861 if (copy_to_user(optval, ¶ms, len))
6869 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6870 char __user *optval, int __user *optlen)
6872 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6873 struct sctp_hmacalgo __user *p = (void __user *)optval;
6874 struct sctp_hmac_algo_param *hmacs;
6879 if (!ep->auth_enable)
6882 hmacs = ep->auth_hmacs_list;
6883 data_len = ntohs(hmacs->param_hdr.length) -
6884 sizeof(struct sctp_paramhdr);
6886 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6889 len = sizeof(struct sctp_hmacalgo) + data_len;
6890 num_idents = data_len / sizeof(u16);
6892 if (put_user(len, optlen))
6894 if (put_user(num_idents, &p->shmac_num_idents))
6896 for (i = 0; i < num_idents; i++) {
6897 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6899 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6905 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6906 char __user *optval, int __user *optlen)
6908 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6909 struct sctp_authkeyid val;
6910 struct sctp_association *asoc;
6912 if (len < sizeof(struct sctp_authkeyid))
6915 len = sizeof(struct sctp_authkeyid);
6916 if (copy_from_user(&val, optval, len))
6919 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6920 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6924 if (!asoc->peer.auth_capable)
6926 val.scact_keynumber = asoc->active_key_id;
6928 if (!ep->auth_enable)
6930 val.scact_keynumber = ep->active_key_id;
6933 if (put_user(len, optlen))
6935 if (copy_to_user(optval, &val, len))
6941 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6942 char __user *optval, int __user *optlen)
6944 struct sctp_authchunks __user *p = (void __user *)optval;
6945 struct sctp_authchunks val;
6946 struct sctp_association *asoc;
6947 struct sctp_chunks_param *ch;
6951 if (len < sizeof(struct sctp_authchunks))
6954 if (copy_from_user(&val, optval, sizeof(val)))
6957 to = p->gauth_chunks;
6958 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6962 if (!asoc->peer.auth_capable)
6965 ch = asoc->peer.peer_chunks;
6969 /* See if the user provided enough room for all the data */
6970 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6971 if (len < num_chunks)
6974 if (copy_to_user(to, ch->chunks, num_chunks))
6977 len = sizeof(struct sctp_authchunks) + num_chunks;
6978 if (put_user(len, optlen))
6980 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6985 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6986 char __user *optval, int __user *optlen)
6988 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6989 struct sctp_authchunks __user *p = (void __user *)optval;
6990 struct sctp_authchunks val;
6991 struct sctp_association *asoc;
6992 struct sctp_chunks_param *ch;
6996 if (len < sizeof(struct sctp_authchunks))
6999 if (copy_from_user(&val, optval, sizeof(val)))
7002 to = p->gauth_chunks;
7003 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7004 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7005 sctp_style(sk, UDP))
7009 if (!asoc->peer.auth_capable)
7011 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7013 if (!ep->auth_enable)
7015 ch = ep->auth_chunk_list;
7020 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7021 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7024 if (copy_to_user(to, ch->chunks, num_chunks))
7027 len = sizeof(struct sctp_authchunks) + num_chunks;
7028 if (put_user(len, optlen))
7030 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7037 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7038 * This option gets the current number of associations that are attached
7039 * to a one-to-many style socket. The option value is an uint32_t.
7041 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7042 char __user *optval, int __user *optlen)
7044 struct sctp_sock *sp = sctp_sk(sk);
7045 struct sctp_association *asoc;
7048 if (sctp_style(sk, TCP))
7051 if (len < sizeof(u32))
7056 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7060 if (put_user(len, optlen))
7062 if (copy_to_user(optval, &val, len))
7069 * 8.1.23 SCTP_AUTO_ASCONF
7070 * See the corresponding setsockopt entry as description
7072 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7073 char __user *optval, int __user *optlen)
7077 if (len < sizeof(int))
7081 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7083 if (put_user(len, optlen))
7085 if (copy_to_user(optval, &val, len))
7091 * 8.2.6. Get the Current Identifiers of Associations
7092 * (SCTP_GET_ASSOC_ID_LIST)
7094 * This option gets the current list of SCTP association identifiers of
7095 * the SCTP associations handled by a one-to-many style socket.
7097 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7098 char __user *optval, int __user *optlen)
7100 struct sctp_sock *sp = sctp_sk(sk);
7101 struct sctp_association *asoc;
7102 struct sctp_assoc_ids *ids;
7105 if (sctp_style(sk, TCP))
7108 if (len < sizeof(struct sctp_assoc_ids))
7111 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7115 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7118 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7120 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7124 ids->gaids_number_of_ids = num;
7126 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7127 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7130 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7140 * SCTP_PEER_ADDR_THLDS
7142 * This option allows us to fetch the partially failed threshold for one or all
7143 * transports in an association. See Section 6.1 of:
7144 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7146 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7147 char __user *optval, int len,
7148 int __user *optlen, bool v2)
7150 struct sctp_paddrthlds_v2 val;
7151 struct sctp_transport *trans;
7152 struct sctp_association *asoc;
7155 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7159 if (copy_from_user(&val, optval, len))
7162 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7163 trans = sctp_addr_id2transport(sk, &val.spt_address,
7168 val.spt_pathmaxrxt = trans->pathmaxrxt;
7169 val.spt_pathpfthld = trans->pf_retrans;
7170 val.spt_pathcpthld = trans->ps_retrans;
7175 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7176 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7177 sctp_style(sk, UDP))
7181 val.spt_pathpfthld = asoc->pf_retrans;
7182 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7183 val.spt_pathcpthld = asoc->ps_retrans;
7185 struct sctp_sock *sp = sctp_sk(sk);
7187 val.spt_pathpfthld = sp->pf_retrans;
7188 val.spt_pathmaxrxt = sp->pathmaxrxt;
7189 val.spt_pathcpthld = sp->ps_retrans;
7193 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7200 * SCTP_GET_ASSOC_STATS
7202 * This option retrieves local per endpoint statistics. It is modeled
7203 * after OpenSolaris' implementation
7205 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7206 char __user *optval,
7209 struct sctp_assoc_stats sas;
7210 struct sctp_association *asoc = NULL;
7212 /* User must provide at least the assoc id */
7213 if (len < sizeof(sctp_assoc_t))
7216 /* Allow the struct to grow and fill in as much as possible */
7217 len = min_t(size_t, len, sizeof(sas));
7219 if (copy_from_user(&sas, optval, len))
7222 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7226 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7227 sas.sas_gapcnt = asoc->stats.gapcnt;
7228 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7229 sas.sas_osacks = asoc->stats.osacks;
7230 sas.sas_isacks = asoc->stats.isacks;
7231 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7232 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7233 sas.sas_oodchunks = asoc->stats.oodchunks;
7234 sas.sas_iodchunks = asoc->stats.iodchunks;
7235 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7236 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7237 sas.sas_idupchunks = asoc->stats.idupchunks;
7238 sas.sas_opackets = asoc->stats.opackets;
7239 sas.sas_ipackets = asoc->stats.ipackets;
7241 /* New high max rto observed, will return 0 if not a single
7242 * RTO update took place. obs_rto_ipaddr will be bogus
7245 sas.sas_maxrto = asoc->stats.max_obs_rto;
7246 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7247 sizeof(struct sockaddr_storage));
7249 /* Mark beginning of a new observation period */
7250 asoc->stats.max_obs_rto = asoc->rto_min;
7252 if (put_user(len, optlen))
7255 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7257 if (copy_to_user(optval, &sas, len))
7263 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7264 char __user *optval,
7269 if (len < sizeof(int))
7273 if (sctp_sk(sk)->recvrcvinfo)
7275 if (put_user(len, optlen))
7277 if (copy_to_user(optval, &val, len))
7283 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7284 char __user *optval,
7289 if (len < sizeof(int))
7293 if (sctp_sk(sk)->recvnxtinfo)
7295 if (put_user(len, optlen))
7297 if (copy_to_user(optval, &val, len))
7303 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7304 char __user *optval,
7307 struct sctp_assoc_value params;
7308 struct sctp_association *asoc;
7309 int retval = -EFAULT;
7311 if (len < sizeof(params)) {
7316 len = sizeof(params);
7317 if (copy_from_user(¶ms, optval, len))
7320 asoc = sctp_id2assoc(sk, params.assoc_id);
7321 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7322 sctp_style(sk, UDP)) {
7327 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7328 : sctp_sk(sk)->ep->prsctp_enable;
7330 if (put_user(len, optlen))
7333 if (copy_to_user(optval, ¶ms, len))
7342 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7343 char __user *optval,
7346 struct sctp_default_prinfo info;
7347 struct sctp_association *asoc;
7348 int retval = -EFAULT;
7350 if (len < sizeof(info)) {
7356 if (copy_from_user(&info, optval, len))
7359 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7360 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7361 sctp_style(sk, UDP)) {
7367 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7368 info.pr_value = asoc->default_timetolive;
7370 struct sctp_sock *sp = sctp_sk(sk);
7372 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7373 info.pr_value = sp->default_timetolive;
7376 if (put_user(len, optlen))
7379 if (copy_to_user(optval, &info, len))
7388 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7389 char __user *optval,
7392 struct sctp_prstatus params;
7393 struct sctp_association *asoc;
7395 int retval = -EINVAL;
7397 if (len < sizeof(params))
7400 len = sizeof(params);
7401 if (copy_from_user(¶ms, optval, len)) {
7406 policy = params.sprstat_policy;
7407 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7408 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7411 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7415 if (policy == SCTP_PR_SCTP_ALL) {
7416 params.sprstat_abandoned_unsent = 0;
7417 params.sprstat_abandoned_sent = 0;
7418 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7419 params.sprstat_abandoned_unsent +=
7420 asoc->abandoned_unsent[policy];
7421 params.sprstat_abandoned_sent +=
7422 asoc->abandoned_sent[policy];
7425 params.sprstat_abandoned_unsent =
7426 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7427 params.sprstat_abandoned_sent =
7428 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7431 if (put_user(len, optlen)) {
7436 if (copy_to_user(optval, ¶ms, len)) {
7447 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7448 char __user *optval,
7451 struct sctp_stream_out_ext *streamoute;
7452 struct sctp_association *asoc;
7453 struct sctp_prstatus params;
7454 int retval = -EINVAL;
7457 if (len < sizeof(params))
7460 len = sizeof(params);
7461 if (copy_from_user(¶ms, optval, len)) {
7466 policy = params.sprstat_policy;
7467 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7468 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7471 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7472 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7475 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7477 /* Not allocated yet, means all stats are 0 */
7478 params.sprstat_abandoned_unsent = 0;
7479 params.sprstat_abandoned_sent = 0;
7484 if (policy == SCTP_PR_SCTP_ALL) {
7485 params.sprstat_abandoned_unsent = 0;
7486 params.sprstat_abandoned_sent = 0;
7487 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7488 params.sprstat_abandoned_unsent +=
7489 streamoute->abandoned_unsent[policy];
7490 params.sprstat_abandoned_sent +=
7491 streamoute->abandoned_sent[policy];
7494 params.sprstat_abandoned_unsent =
7495 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7496 params.sprstat_abandoned_sent =
7497 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7500 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7511 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7512 char __user *optval,
7515 struct sctp_assoc_value params;
7516 struct sctp_association *asoc;
7517 int retval = -EFAULT;
7519 if (len < sizeof(params)) {
7524 len = sizeof(params);
7525 if (copy_from_user(¶ms, optval, len))
7528 asoc = sctp_id2assoc(sk, params.assoc_id);
7529 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7530 sctp_style(sk, UDP)) {
7535 params.assoc_value = asoc ? asoc->peer.reconf_capable
7536 : sctp_sk(sk)->ep->reconf_enable;
7538 if (put_user(len, optlen))
7541 if (copy_to_user(optval, ¶ms, len))
7550 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7551 char __user *optval,
7554 struct sctp_assoc_value params;
7555 struct sctp_association *asoc;
7556 int retval = -EFAULT;
7558 if (len < sizeof(params)) {
7563 len = sizeof(params);
7564 if (copy_from_user(¶ms, optval, len))
7567 asoc = sctp_id2assoc(sk, params.assoc_id);
7568 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7569 sctp_style(sk, UDP)) {
7574 params.assoc_value = asoc ? asoc->strreset_enable
7575 : sctp_sk(sk)->ep->strreset_enable;
7577 if (put_user(len, optlen))
7580 if (copy_to_user(optval, ¶ms, len))
7589 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7590 char __user *optval,
7593 struct sctp_assoc_value params;
7594 struct sctp_association *asoc;
7595 int retval = -EFAULT;
7597 if (len < sizeof(params)) {
7602 len = sizeof(params);
7603 if (copy_from_user(¶ms, optval, len))
7606 asoc = sctp_id2assoc(sk, params.assoc_id);
7607 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7608 sctp_style(sk, UDP)) {
7613 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7614 : sctp_sk(sk)->default_ss;
7616 if (put_user(len, optlen))
7619 if (copy_to_user(optval, ¶ms, len))
7628 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7629 char __user *optval,
7632 struct sctp_stream_value params;
7633 struct sctp_association *asoc;
7634 int retval = -EFAULT;
7636 if (len < sizeof(params)) {
7641 len = sizeof(params);
7642 if (copy_from_user(¶ms, optval, len))
7645 asoc = sctp_id2assoc(sk, params.assoc_id);
7651 retval = sctp_sched_get_value(asoc, params.stream_id,
7652 ¶ms.stream_value);
7656 if (put_user(len, optlen)) {
7661 if (copy_to_user(optval, ¶ms, len)) {
7670 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7671 char __user *optval,
7674 struct sctp_assoc_value params;
7675 struct sctp_association *asoc;
7676 int retval = -EFAULT;
7678 if (len < sizeof(params)) {
7683 len = sizeof(params);
7684 if (copy_from_user(¶ms, optval, len))
7687 asoc = sctp_id2assoc(sk, params.assoc_id);
7688 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7689 sctp_style(sk, UDP)) {
7694 params.assoc_value = asoc ? asoc->peer.intl_capable
7695 : sctp_sk(sk)->ep->intl_enable;
7697 if (put_user(len, optlen))
7700 if (copy_to_user(optval, ¶ms, len))
7709 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7710 char __user *optval,
7715 if (len < sizeof(int))
7719 val = sctp_sk(sk)->reuse;
7720 if (put_user(len, optlen))
7723 if (copy_to_user(optval, &val, len))
7729 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7732 struct sctp_association *asoc;
7733 struct sctp_event param;
7736 if (len < sizeof(param))
7739 len = sizeof(param);
7740 if (copy_from_user(¶m, optval, len))
7743 if (param.se_type < SCTP_SN_TYPE_BASE ||
7744 param.se_type > SCTP_SN_TYPE_MAX)
7747 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7748 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7749 sctp_style(sk, UDP))
7752 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7753 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7755 if (put_user(len, optlen))
7758 if (copy_to_user(optval, ¶m, len))
7764 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7765 char __user *optval,
7768 struct sctp_assoc_value params;
7769 struct sctp_association *asoc;
7770 int retval = -EFAULT;
7772 if (len < sizeof(params)) {
7777 len = sizeof(params);
7778 if (copy_from_user(¶ms, optval, len))
7781 asoc = sctp_id2assoc(sk, params.assoc_id);
7782 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7783 sctp_style(sk, UDP)) {
7788 params.assoc_value = asoc ? asoc->peer.asconf_capable
7789 : sctp_sk(sk)->ep->asconf_enable;
7791 if (put_user(len, optlen))
7794 if (copy_to_user(optval, ¶ms, len))
7803 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7804 char __user *optval,
7807 struct sctp_assoc_value params;
7808 struct sctp_association *asoc;
7809 int retval = -EFAULT;
7811 if (len < sizeof(params)) {
7816 len = sizeof(params);
7817 if (copy_from_user(¶ms, optval, len))
7820 asoc = sctp_id2assoc(sk, params.assoc_id);
7821 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7822 sctp_style(sk, UDP)) {
7827 params.assoc_value = asoc ? asoc->peer.auth_capable
7828 : sctp_sk(sk)->ep->auth_enable;
7830 if (put_user(len, optlen))
7833 if (copy_to_user(optval, ¶ms, len))
7842 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7843 char __user *optval,
7846 struct sctp_assoc_value params;
7847 struct sctp_association *asoc;
7848 int retval = -EFAULT;
7850 if (len < sizeof(params)) {
7855 len = sizeof(params);
7856 if (copy_from_user(¶ms, optval, len))
7859 asoc = sctp_id2assoc(sk, params.assoc_id);
7860 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7861 sctp_style(sk, UDP)) {
7866 params.assoc_value = asoc ? asoc->peer.ecn_capable
7867 : sctp_sk(sk)->ep->ecn_enable;
7869 if (put_user(len, optlen))
7872 if (copy_to_user(optval, ¶ms, len))
7881 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7882 char __user *optval,
7885 struct sctp_assoc_value params;
7886 struct sctp_association *asoc;
7887 int retval = -EFAULT;
7889 if (len < sizeof(params)) {
7894 len = sizeof(params);
7895 if (copy_from_user(¶ms, optval, len))
7898 asoc = sctp_id2assoc(sk, params.assoc_id);
7899 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7900 sctp_style(sk, UDP)) {
7905 params.assoc_value = asoc ? asoc->pf_expose
7906 : sctp_sk(sk)->pf_expose;
7908 if (put_user(len, optlen))
7911 if (copy_to_user(optval, ¶ms, len))
7920 static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7921 char __user *optval, int __user *optlen)
7923 struct sctp_association *asoc;
7924 struct sctp_udpencaps encap;
7925 struct sctp_transport *t;
7928 if (len < sizeof(encap))
7931 len = sizeof(encap);
7932 if (copy_from_user(&encap, optval, len))
7935 /* If an address other than INADDR_ANY is specified, and
7936 * no transport is found, then the request is invalid.
7938 if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7939 t = sctp_addr_id2transport(sk, &encap.sue_address,
7940 encap.sue_assoc_id);
7942 pr_debug("%s: failed no transport\n", __func__);
7946 encap_port = t->encap_port;
7950 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7951 * socket is a one to many style socket, and an association
7952 * was not found, then the id was invalid.
7954 asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7955 if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7956 sctp_style(sk, UDP)) {
7957 pr_debug("%s: failed no association\n", __func__);
7962 encap_port = asoc->encap_port;
7966 encap_port = sctp_sk(sk)->encap_port;
7969 encap.sue_port = (__force uint16_t)encap_port;
7970 if (copy_to_user(optval, &encap, len))
7973 if (put_user(len, optlen))
7979 static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
7980 char __user *optval,
7983 struct sctp_probeinterval params;
7984 struct sctp_association *asoc;
7985 struct sctp_transport *t;
7986 __u32 probe_interval;
7988 if (len < sizeof(params))
7991 len = sizeof(params);
7992 if (copy_from_user(¶ms, optval, len))
7995 /* If an address other than INADDR_ANY is specified, and
7996 * no transport is found, then the request is invalid.
7998 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spi_address)) {
7999 t = sctp_addr_id2transport(sk, ¶ms.spi_address,
8000 params.spi_assoc_id);
8002 pr_debug("%s: failed no transport\n", __func__);
8006 probe_interval = jiffies_to_msecs(t->probe_interval);
8010 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8011 * socket is a one to many style socket, and an association
8012 * was not found, then the id was invalid.
8014 asoc = sctp_id2assoc(sk, params.spi_assoc_id);
8015 if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8016 sctp_style(sk, UDP)) {
8017 pr_debug("%s: failed no association\n", __func__);
8022 probe_interval = jiffies_to_msecs(asoc->probe_interval);
8026 probe_interval = sctp_sk(sk)->probe_interval;
8029 params.spi_interval = probe_interval;
8030 if (copy_to_user(optval, ¶ms, len))
8033 if (put_user(len, optlen))
8039 static int sctp_getsockopt(struct sock *sk, int level, int optname,
8040 char __user *optval, int __user *optlen)
8045 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8047 /* I can hardly begin to describe how wrong this is. This is
8048 * so broken as to be worse than useless. The API draft
8049 * REALLY is NOT helpful here... I am not convinced that the
8050 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8051 * are at all well-founded.
8053 if (level != SOL_SCTP) {
8054 struct sctp_af *af = sctp_sk(sk)->pf->af;
8056 retval = af->getsockopt(sk, level, optname, optval, optlen);
8060 if (get_user(len, optlen))
8070 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8072 case SCTP_DISABLE_FRAGMENTS:
8073 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8077 retval = sctp_getsockopt_events(sk, len, optval, optlen);
8079 case SCTP_AUTOCLOSE:
8080 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8082 case SCTP_SOCKOPT_PEELOFF:
8083 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8085 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8086 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8088 case SCTP_PEER_ADDR_PARAMS:
8089 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8092 case SCTP_DELAYED_SACK:
8093 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8097 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8099 case SCTP_GET_PEER_ADDRS:
8100 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8103 case SCTP_GET_LOCAL_ADDRS:
8104 retval = sctp_getsockopt_local_addrs(sk, len, optval,
8107 case SCTP_SOCKOPT_CONNECTX3:
8108 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8110 case SCTP_DEFAULT_SEND_PARAM:
8111 retval = sctp_getsockopt_default_send_param(sk, len,
8114 case SCTP_DEFAULT_SNDINFO:
8115 retval = sctp_getsockopt_default_sndinfo(sk, len,
8118 case SCTP_PRIMARY_ADDR:
8119 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8122 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8125 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8127 case SCTP_ASSOCINFO:
8128 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8130 case SCTP_I_WANT_MAPPED_V4_ADDR:
8131 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8134 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8136 case SCTP_GET_PEER_ADDR_INFO:
8137 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8140 case SCTP_ADAPTATION_LAYER:
8141 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8145 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8147 case SCTP_FRAGMENT_INTERLEAVE:
8148 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8151 case SCTP_PARTIAL_DELIVERY_POINT:
8152 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8155 case SCTP_MAX_BURST:
8156 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8159 case SCTP_AUTH_CHUNK:
8160 case SCTP_AUTH_DELETE_KEY:
8161 case SCTP_AUTH_DEACTIVATE_KEY:
8162 retval = -EOPNOTSUPP;
8164 case SCTP_HMAC_IDENT:
8165 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8167 case SCTP_AUTH_ACTIVE_KEY:
8168 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8170 case SCTP_PEER_AUTH_CHUNKS:
8171 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8174 case SCTP_LOCAL_AUTH_CHUNKS:
8175 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8178 case SCTP_GET_ASSOC_NUMBER:
8179 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8181 case SCTP_GET_ASSOC_ID_LIST:
8182 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8184 case SCTP_AUTO_ASCONF:
8185 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8187 case SCTP_PEER_ADDR_THLDS:
8188 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8191 case SCTP_PEER_ADDR_THLDS_V2:
8192 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8195 case SCTP_GET_ASSOC_STATS:
8196 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8198 case SCTP_RECVRCVINFO:
8199 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8201 case SCTP_RECVNXTINFO:
8202 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8204 case SCTP_PR_SUPPORTED:
8205 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8207 case SCTP_DEFAULT_PRINFO:
8208 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8211 case SCTP_PR_ASSOC_STATUS:
8212 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8215 case SCTP_PR_STREAM_STATUS:
8216 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8219 case SCTP_RECONFIG_SUPPORTED:
8220 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8223 case SCTP_ENABLE_STREAM_RESET:
8224 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8227 case SCTP_STREAM_SCHEDULER:
8228 retval = sctp_getsockopt_scheduler(sk, len, optval,
8231 case SCTP_STREAM_SCHEDULER_VALUE:
8232 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8235 case SCTP_INTERLEAVING_SUPPORTED:
8236 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8239 case SCTP_REUSE_PORT:
8240 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8243 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8245 case SCTP_ASCONF_SUPPORTED:
8246 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8249 case SCTP_AUTH_SUPPORTED:
8250 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8253 case SCTP_ECN_SUPPORTED:
8254 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8256 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8257 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8259 case SCTP_REMOTE_UDP_ENCAPS_PORT:
8260 retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8262 case SCTP_PLPMTUD_PROBE_INTERVAL:
8263 retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8266 retval = -ENOPROTOOPT;
8274 static int sctp_hash(struct sock *sk)
8280 static void sctp_unhash(struct sock *sk)
8285 /* Check if port is acceptable. Possibly find first available port.
8287 * The port hash table (contained in the 'global' SCTP protocol storage
8288 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8289 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8290 * list (the list number is the port number hashed out, so as you
8291 * would expect from a hash function, all the ports in a given list have
8292 * such a number that hashes out to the same list number; you were
8293 * expecting that, right?); so each list has a set of ports, with a
8294 * link to the socket (struct sock) that uses it, the port number and
8295 * a fastreuse flag (FIXME: NPI ipg).
8297 static struct sctp_bind_bucket *sctp_bucket_create(
8298 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8300 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8302 struct sctp_sock *sp = sctp_sk(sk);
8303 bool reuse = (sk->sk_reuse || sp->reuse);
8304 struct sctp_bind_hashbucket *head; /* hash list */
8305 struct net *net = sock_net(sk);
8306 kuid_t uid = sock_i_uid(sk);
8307 struct sctp_bind_bucket *pp;
8308 unsigned short snum;
8311 snum = ntohs(addr->v4.sin_port);
8313 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8316 /* Search for an available port. */
8317 int low, high, remaining, index;
8320 inet_get_local_port_range(net, &low, &high);
8321 remaining = (high - low) + 1;
8322 rover = prandom_u32() % remaining + low;
8326 if ((rover < low) || (rover > high))
8328 if (inet_is_local_reserved_port(net, rover))
8330 index = sctp_phashfn(net, rover);
8331 head = &sctp_port_hashtable[index];
8332 spin_lock_bh(&head->lock);
8333 sctp_for_each_hentry(pp, &head->chain)
8334 if ((pp->port == rover) &&
8335 net_eq(net, pp->net))
8339 spin_unlock_bh(&head->lock);
8341 } while (--remaining > 0);
8343 /* Exhausted local port range during search? */
8348 /* OK, here is the one we will use. HEAD (the port
8349 * hash table list entry) is non-NULL and we hold it's
8354 /* We are given an specific port number; we verify
8355 * that it is not being used. If it is used, we will
8356 * exahust the search in the hash list corresponding
8357 * to the port number (snum) - we detect that with the
8358 * port iterator, pp being NULL.
8360 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8361 spin_lock_bh(&head->lock);
8362 sctp_for_each_hentry(pp, &head->chain) {
8363 if ((pp->port == snum) && net_eq(pp->net, net))
8370 if (!hlist_empty(&pp->owner)) {
8371 /* We had a port hash table hit - there is an
8372 * available port (pp != NULL) and it is being
8373 * used by other socket (pp->owner not empty); that other
8374 * socket is going to be sk2.
8378 pr_debug("%s: found a possible match\n", __func__);
8380 if ((pp->fastreuse && reuse &&
8381 sk->sk_state != SCTP_SS_LISTENING) ||
8382 (pp->fastreuseport && sk->sk_reuseport &&
8383 uid_eq(pp->fastuid, uid)))
8386 /* Run through the list of sockets bound to the port
8387 * (pp->port) [via the pointers bind_next and
8388 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8389 * we get the endpoint they describe and run through
8390 * the endpoint's list of IP (v4 or v6) addresses,
8391 * comparing each of the addresses with the address of
8392 * the socket sk. If we find a match, then that means
8393 * that this port/socket (sk) combination are already
8396 sk_for_each_bound(sk2, &pp->owner) {
8397 struct sctp_sock *sp2 = sctp_sk(sk2);
8398 struct sctp_endpoint *ep2 = sp2->ep;
8401 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8402 sk2->sk_state != SCTP_SS_LISTENING) ||
8403 (sk->sk_reuseport && sk2->sk_reuseport &&
8404 uid_eq(uid, sock_i_uid(sk2))))
8407 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8414 pr_debug("%s: found a match\n", __func__);
8417 /* If there was a hash table miss, create a new port. */
8419 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8422 /* In either case (hit or miss), make sure fastreuse is 1 only
8423 * if sk->sk_reuse is too (that is, if the caller requested
8424 * SO_REUSEADDR on this socket -sk-).
8426 if (hlist_empty(&pp->owner)) {
8427 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8432 if (sk->sk_reuseport) {
8433 pp->fastreuseport = 1;
8436 pp->fastreuseport = 0;
8439 if (pp->fastreuse &&
8440 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8443 if (pp->fastreuseport &&
8444 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8445 pp->fastreuseport = 0;
8448 /* We are set, so fill up all the data in the hash table
8449 * entry, tie the socket list information with the rest of the
8450 * sockets FIXME: Blurry, NPI (ipg).
8453 if (!sp->bind_hash) {
8454 inet_sk(sk)->inet_num = snum;
8455 sk_add_bind_node(sk, &pp->owner);
8461 spin_unlock_bh(&head->lock);
8465 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8466 * port is requested.
8468 static int sctp_get_port(struct sock *sk, unsigned short snum)
8470 union sctp_addr addr;
8471 struct sctp_af *af = sctp_sk(sk)->pf->af;
8473 /* Set up a dummy address struct from the sk. */
8474 af->from_sk(&addr, sk);
8475 addr.v4.sin_port = htons(snum);
8477 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8478 return sctp_get_port_local(sk, &addr);
8482 * Move a socket to LISTENING state.
8484 static int sctp_listen_start(struct sock *sk, int backlog)
8486 struct sctp_sock *sp = sctp_sk(sk);
8487 struct sctp_endpoint *ep = sp->ep;
8488 struct crypto_shash *tfm = NULL;
8491 /* Allocate HMAC for generating cookie. */
8492 if (!sp->hmac && sp->sctp_hmac_alg) {
8493 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8494 tfm = crypto_alloc_shash(alg, 0, 0);
8496 net_info_ratelimited("failed to load transform for %s: %ld\n",
8497 sp->sctp_hmac_alg, PTR_ERR(tfm));
8500 sctp_sk(sk)->hmac = tfm;
8504 * If a bind() or sctp_bindx() is not called prior to a listen()
8505 * call that allows new associations to be accepted, the system
8506 * picks an ephemeral port and will choose an address set equivalent
8507 * to binding with a wildcard address.
8509 * This is not currently spelled out in the SCTP sockets
8510 * extensions draft, but follows the practice as seen in TCP
8514 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8515 if (!ep->base.bind_addr.port) {
8516 if (sctp_autobind(sk))
8519 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8520 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8525 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8526 return sctp_hash_endpoint(ep);
8530 * 4.1.3 / 5.1.3 listen()
8532 * By default, new associations are not accepted for UDP style sockets.
8533 * An application uses listen() to mark a socket as being able to
8534 * accept new associations.
8536 * On TCP style sockets, applications use listen() to ready the SCTP
8537 * endpoint for accepting inbound associations.
8539 * On both types of endpoints a backlog of '0' disables listening.
8541 * Move a socket to LISTENING state.
8543 int sctp_inet_listen(struct socket *sock, int backlog)
8545 struct sock *sk = sock->sk;
8546 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8549 if (unlikely(backlog < 0))
8554 /* Peeled-off sockets are not allowed to listen(). */
8555 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8558 if (sock->state != SS_UNCONNECTED)
8561 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8564 /* If backlog is zero, disable listening. */
8566 if (sctp_sstate(sk, CLOSED))
8570 sctp_unhash_endpoint(ep);
8571 sk->sk_state = SCTP_SS_CLOSED;
8572 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8573 sctp_sk(sk)->bind_hash->fastreuse = 1;
8577 /* If we are already listening, just update the backlog */
8578 if (sctp_sstate(sk, LISTENING))
8579 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8581 err = sctp_listen_start(sk, backlog);
8593 * This function is done by modeling the current datagram_poll() and the
8594 * tcp_poll(). Note that, based on these implementations, we don't
8595 * lock the socket in this function, even though it seems that,
8596 * ideally, locking or some other mechanisms can be used to ensure
8597 * the integrity of the counters (sndbuf and wmem_alloc) used
8598 * in this place. We assume that we don't need locks either until proven
8601 * Another thing to note is that we include the Async I/O support
8602 * here, again, by modeling the current TCP/UDP code. We don't have
8603 * a good way to test with it yet.
8605 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8607 struct sock *sk = sock->sk;
8608 struct sctp_sock *sp = sctp_sk(sk);
8611 poll_wait(file, sk_sleep(sk), wait);
8613 sock_rps_record_flow(sk);
8615 /* A TCP-style listening socket becomes readable when the accept queue
8618 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8619 return (!list_empty(&sp->ep->asocs)) ?
8620 (EPOLLIN | EPOLLRDNORM) : 0;
8624 /* Is there any exceptional events? */
8625 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8627 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8628 if (sk->sk_shutdown & RCV_SHUTDOWN)
8629 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8630 if (sk->sk_shutdown == SHUTDOWN_MASK)
8633 /* Is it readable? Reconsider this code with TCP-style support. */
8634 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8635 mask |= EPOLLIN | EPOLLRDNORM;
8637 /* The association is either gone or not ready. */
8638 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8641 /* Is it writable? */
8642 if (sctp_writeable(sk)) {
8643 mask |= EPOLLOUT | EPOLLWRNORM;
8645 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8647 * Since the socket is not locked, the buffer
8648 * might be made available after the writeable check and
8649 * before the bit is set. This could cause a lost I/O
8650 * signal. tcp_poll() has a race breaker for this race
8651 * condition. Based on their implementation, we put
8652 * in the following code to cover it as well.
8654 if (sctp_writeable(sk))
8655 mask |= EPOLLOUT | EPOLLWRNORM;
8660 /********************************************************************
8661 * 2nd Level Abstractions
8662 ********************************************************************/
8664 static struct sctp_bind_bucket *sctp_bucket_create(
8665 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8667 struct sctp_bind_bucket *pp;
8669 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8671 SCTP_DBG_OBJCNT_INC(bind_bucket);
8674 INIT_HLIST_HEAD(&pp->owner);
8676 hlist_add_head(&pp->node, &head->chain);
8681 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8682 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8684 if (pp && hlist_empty(&pp->owner)) {
8685 __hlist_del(&pp->node);
8686 kmem_cache_free(sctp_bucket_cachep, pp);
8687 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8691 /* Release this socket's reference to a local port. */
8692 static inline void __sctp_put_port(struct sock *sk)
8694 struct sctp_bind_hashbucket *head =
8695 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8696 inet_sk(sk)->inet_num)];
8697 struct sctp_bind_bucket *pp;
8699 spin_lock(&head->lock);
8700 pp = sctp_sk(sk)->bind_hash;
8701 __sk_del_bind_node(sk);
8702 sctp_sk(sk)->bind_hash = NULL;
8703 inet_sk(sk)->inet_num = 0;
8704 sctp_bucket_destroy(pp);
8705 spin_unlock(&head->lock);
8708 void sctp_put_port(struct sock *sk)
8711 __sctp_put_port(sk);
8716 * The system picks an ephemeral port and choose an address set equivalent
8717 * to binding with a wildcard address.
8718 * One of those addresses will be the primary address for the association.
8719 * This automatically enables the multihoming capability of SCTP.
8721 static int sctp_autobind(struct sock *sk)
8723 union sctp_addr autoaddr;
8727 /* Initialize a local sockaddr structure to INADDR_ANY. */
8728 af = sctp_sk(sk)->pf->af;
8730 port = htons(inet_sk(sk)->inet_num);
8731 af->inaddr_any(&autoaddr, port);
8733 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8736 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8739 * 4.2 The cmsghdr Structure *
8741 * When ancillary data is sent or received, any number of ancillary data
8742 * objects can be specified by the msg_control and msg_controllen members of
8743 * the msghdr structure, because each object is preceded by
8744 * a cmsghdr structure defining the object's length (the cmsg_len member).
8745 * Historically Berkeley-derived implementations have passed only one object
8746 * at a time, but this API allows multiple objects to be
8747 * passed in a single call to sendmsg() or recvmsg(). The following example
8748 * shows two ancillary data objects in a control buffer.
8750 * |<--------------------------- msg_controllen -------------------------->|
8753 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8755 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8758 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8760 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8763 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8764 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8766 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8768 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8775 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8777 struct msghdr *my_msg = (struct msghdr *)msg;
8778 struct cmsghdr *cmsg;
8780 for_each_cmsghdr(cmsg, my_msg) {
8781 if (!CMSG_OK(my_msg, cmsg))
8784 /* Should we parse this header or ignore? */
8785 if (cmsg->cmsg_level != IPPROTO_SCTP)
8788 /* Strictly check lengths following example in SCM code. */
8789 switch (cmsg->cmsg_type) {
8791 /* SCTP Socket API Extension
8792 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8794 * This cmsghdr structure provides information for
8795 * initializing new SCTP associations with sendmsg().
8796 * The SCTP_INITMSG socket option uses this same data
8797 * structure. This structure is not used for
8800 * cmsg_level cmsg_type cmsg_data[]
8801 * ------------ ------------ ----------------------
8802 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8804 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8807 cmsgs->init = CMSG_DATA(cmsg);
8811 /* SCTP Socket API Extension
8812 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8814 * This cmsghdr structure specifies SCTP options for
8815 * sendmsg() and describes SCTP header information
8816 * about a received message through recvmsg().
8818 * cmsg_level cmsg_type cmsg_data[]
8819 * ------------ ------------ ----------------------
8820 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8822 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8825 cmsgs->srinfo = CMSG_DATA(cmsg);
8827 if (cmsgs->srinfo->sinfo_flags &
8828 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8829 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8830 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8835 /* SCTP Socket API Extension
8836 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8838 * This cmsghdr structure specifies SCTP options for
8839 * sendmsg(). This structure and SCTP_RCVINFO replaces
8840 * SCTP_SNDRCV which has been deprecated.
8842 * cmsg_level cmsg_type cmsg_data[]
8843 * ------------ ------------ ---------------------
8844 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8846 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8849 cmsgs->sinfo = CMSG_DATA(cmsg);
8851 if (cmsgs->sinfo->snd_flags &
8852 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8853 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8854 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8858 /* SCTP Socket API Extension
8859 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8861 * This cmsghdr structure specifies SCTP options for sendmsg().
8863 * cmsg_level cmsg_type cmsg_data[]
8864 * ------------ ------------ ---------------------
8865 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8867 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8870 cmsgs->prinfo = CMSG_DATA(cmsg);
8871 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8874 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8875 cmsgs->prinfo->pr_value = 0;
8878 /* SCTP Socket API Extension
8879 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8881 * This cmsghdr structure specifies SCTP options for sendmsg().
8883 * cmsg_level cmsg_type cmsg_data[]
8884 * ------------ ------------ ---------------------
8885 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8887 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8890 cmsgs->authinfo = CMSG_DATA(cmsg);
8892 case SCTP_DSTADDRV4:
8893 case SCTP_DSTADDRV6:
8894 /* SCTP Socket API Extension
8895 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8897 * This cmsghdr structure specifies SCTP options for sendmsg().
8899 * cmsg_level cmsg_type cmsg_data[]
8900 * ------------ ------------ ---------------------
8901 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8902 * ------------ ------------ ---------------------
8903 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8905 cmsgs->addrs_msg = my_msg;
8916 * Wait for a packet..
8917 * Note: This function is the same function as in core/datagram.c
8918 * with a few modifications to make lksctp work.
8920 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8925 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8927 /* Socket errors? */
8928 error = sock_error(sk);
8932 if (!skb_queue_empty(&sk->sk_receive_queue))
8935 /* Socket shut down? */
8936 if (sk->sk_shutdown & RCV_SHUTDOWN)
8939 /* Sequenced packets can come disconnected. If so we report the
8944 /* Is there a good reason to think that we may receive some data? */
8945 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8948 /* Handle signals. */
8949 if (signal_pending(current))
8952 /* Let another process have a go. Since we are going to sleep
8953 * anyway. Note: This may cause odd behaviors if the message
8954 * does not fit in the user's buffer, but this seems to be the
8955 * only way to honor MSG_DONTWAIT realistically.
8958 *timeo_p = schedule_timeout(*timeo_p);
8962 finish_wait(sk_sleep(sk), &wait);
8966 error = sock_intr_errno(*timeo_p);
8969 finish_wait(sk_sleep(sk), &wait);
8974 /* Receive a datagram.
8975 * Note: This is pretty much the same routine as in core/datagram.c
8976 * with a few changes to make lksctp work.
8978 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
8981 struct sk_buff *skb;
8984 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
8986 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8987 MAX_SCHEDULE_TIMEOUT);
8990 /* Again only user level code calls this function,
8991 * so nothing interrupt level
8992 * will suddenly eat the receive_queue.
8994 * Look at current nfs client by the way...
8995 * However, this function was correct in any case. 8)
8997 if (flags & MSG_PEEK) {
8998 skb = skb_peek(&sk->sk_receive_queue);
9000 refcount_inc(&skb->users);
9002 skb = __skb_dequeue(&sk->sk_receive_queue);
9008 /* Caller is allowed not to check sk->sk_err before calling. */
9009 error = sock_error(sk);
9013 if (sk->sk_shutdown & RCV_SHUTDOWN)
9016 if (sk_can_busy_loop(sk)) {
9017 sk_busy_loop(sk, flags & MSG_DONTWAIT);
9019 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
9023 /* User doesn't want to wait. */
9027 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
9036 /* If sndbuf has changed, wake up per association sndbuf waiters. */
9037 static void __sctp_write_space(struct sctp_association *asoc)
9039 struct sock *sk = asoc->base.sk;
9041 if (sctp_wspace(asoc) <= 0)
9044 if (waitqueue_active(&asoc->wait))
9045 wake_up_interruptible(&asoc->wait);
9047 if (sctp_writeable(sk)) {
9048 struct socket_wq *wq;
9051 wq = rcu_dereference(sk->sk_wq);
9053 if (waitqueue_active(&wq->wait))
9054 wake_up_interruptible(&wq->wait);
9056 /* Note that we try to include the Async I/O support
9057 * here by modeling from the current TCP/UDP code.
9058 * We have not tested with it yet.
9060 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9061 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9067 static void sctp_wake_up_waiters(struct sock *sk,
9068 struct sctp_association *asoc)
9070 struct sctp_association *tmp = asoc;
9072 /* We do accounting for the sndbuf space per association,
9073 * so we only need to wake our own association.
9075 if (asoc->ep->sndbuf_policy)
9076 return __sctp_write_space(asoc);
9078 /* If association goes down and is just flushing its
9079 * outq, then just normally notify others.
9081 if (asoc->base.dead)
9082 return sctp_write_space(sk);
9084 /* Accounting for the sndbuf space is per socket, so we
9085 * need to wake up others, try to be fair and in case of
9086 * other associations, let them have a go first instead
9087 * of just doing a sctp_write_space() call.
9089 * Note that we reach sctp_wake_up_waiters() only when
9090 * associations free up queued chunks, thus we are under
9091 * lock and the list of associations on a socket is
9092 * guaranteed not to change.
9094 for (tmp = list_next_entry(tmp, asocs); 1;
9095 tmp = list_next_entry(tmp, asocs)) {
9096 /* Manually skip the head element. */
9097 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9099 /* Wake up association. */
9100 __sctp_write_space(tmp);
9101 /* We've reached the end. */
9107 /* Do accounting for the sndbuf space.
9108 * Decrement the used sndbuf space of the corresponding association by the
9109 * data size which was just transmitted(freed).
9111 static void sctp_wfree(struct sk_buff *skb)
9113 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9114 struct sctp_association *asoc = chunk->asoc;
9115 struct sock *sk = asoc->base.sk;
9117 sk_mem_uncharge(sk, skb->truesize);
9118 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
9119 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9120 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9121 &sk->sk_wmem_alloc));
9124 struct sctp_shared_key *shkey = chunk->shkey;
9126 /* refcnt == 2 and !list_empty mean after this release, it's
9127 * not being used anywhere, and it's time to notify userland
9128 * that this shkey can be freed if it's been deactivated.
9130 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9131 refcount_read(&shkey->refcnt) == 2) {
9132 struct sctp_ulpevent *ev;
9134 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9138 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9140 sctp_auth_shkey_release(chunk->shkey);
9144 sctp_wake_up_waiters(sk, asoc);
9146 sctp_association_put(asoc);
9149 /* Do accounting for the receive space on the socket.
9150 * Accounting for the association is done in ulpevent.c
9151 * We set this as a destructor for the cloned data skbs so that
9152 * accounting is done at the correct time.
9154 void sctp_sock_rfree(struct sk_buff *skb)
9156 struct sock *sk = skb->sk;
9157 struct sctp_ulpevent *event = sctp_skb2event(skb);
9159 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9162 * Mimic the behavior of sock_rfree
9164 sk_mem_uncharge(sk, event->rmem_len);
9168 /* Helper function to wait for space in the sndbuf. */
9169 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9172 struct sock *sk = asoc->base.sk;
9173 long current_timeo = *timeo_p;
9177 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9180 /* Increment the association's refcnt. */
9181 sctp_association_hold(asoc);
9183 /* Wait on the association specific sndbuf space. */
9185 prepare_to_wait_exclusive(&asoc->wait, &wait,
9186 TASK_INTERRUPTIBLE);
9187 if (asoc->base.dead)
9191 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9193 if (signal_pending(current))
9194 goto do_interrupted;
9195 if ((int)msg_len <= sctp_wspace(asoc) &&
9196 sk_wmem_schedule(sk, msg_len))
9199 /* Let another process have a go. Since we are going
9203 current_timeo = schedule_timeout(current_timeo);
9205 if (sk != asoc->base.sk)
9208 *timeo_p = current_timeo;
9212 finish_wait(&asoc->wait, &wait);
9214 /* Release the association's refcnt. */
9215 sctp_association_put(asoc);
9228 err = sock_intr_errno(*timeo_p);
9236 void sctp_data_ready(struct sock *sk)
9238 struct socket_wq *wq;
9241 wq = rcu_dereference(sk->sk_wq);
9242 if (skwq_has_sleeper(wq))
9243 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9244 EPOLLRDNORM | EPOLLRDBAND);
9245 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9249 /* If socket sndbuf has changed, wake up all per association waiters. */
9250 void sctp_write_space(struct sock *sk)
9252 struct sctp_association *asoc;
9254 /* Wake up the tasks in each wait queue. */
9255 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9256 __sctp_write_space(asoc);
9260 /* Is there any sndbuf space available on the socket?
9262 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9263 * associations on the same socket. For a UDP-style socket with
9264 * multiple associations, it is possible for it to be "unwriteable"
9265 * prematurely. I assume that this is acceptable because
9266 * a premature "unwriteable" is better than an accidental "writeable" which
9267 * would cause an unwanted block under certain circumstances. For the 1-1
9268 * UDP-style sockets or TCP-style sockets, this code should work.
9271 static bool sctp_writeable(struct sock *sk)
9273 return sk->sk_sndbuf > sk->sk_wmem_queued;
9276 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9277 * returns immediately with EINPROGRESS.
9279 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9281 struct sock *sk = asoc->base.sk;
9283 long current_timeo = *timeo_p;
9286 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9288 /* Increment the association's refcnt. */
9289 sctp_association_hold(asoc);
9292 prepare_to_wait_exclusive(&asoc->wait, &wait,
9293 TASK_INTERRUPTIBLE);
9296 if (sk->sk_shutdown & RCV_SHUTDOWN)
9298 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9301 if (signal_pending(current))
9302 goto do_interrupted;
9304 if (sctp_state(asoc, ESTABLISHED))
9307 /* Let another process have a go. Since we are going
9311 current_timeo = schedule_timeout(current_timeo);
9314 *timeo_p = current_timeo;
9318 finish_wait(&asoc->wait, &wait);
9320 /* Release the association's refcnt. */
9321 sctp_association_put(asoc);
9326 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9329 err = -ECONNREFUSED;
9333 err = sock_intr_errno(*timeo_p);
9341 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9343 struct sctp_endpoint *ep;
9347 ep = sctp_sk(sk)->ep;
9351 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9352 TASK_INTERRUPTIBLE);
9354 if (list_empty(&ep->asocs)) {
9356 timeo = schedule_timeout(timeo);
9361 if (!sctp_sstate(sk, LISTENING))
9365 if (!list_empty(&ep->asocs))
9368 err = sock_intr_errno(timeo);
9369 if (signal_pending(current))
9377 finish_wait(sk_sleep(sk), &wait);
9382 static void sctp_wait_for_close(struct sock *sk, long timeout)
9387 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9388 if (list_empty(&sctp_sk(sk)->ep->asocs))
9391 timeout = schedule_timeout(timeout);
9393 } while (!signal_pending(current) && timeout);
9395 finish_wait(sk_sleep(sk), &wait);
9398 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9400 struct sk_buff *frag;
9405 /* Don't forget the fragments. */
9406 skb_walk_frags(skb, frag)
9407 sctp_skb_set_owner_r_frag(frag, sk);
9410 sctp_skb_set_owner_r(skb, sk);
9413 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9414 struct sctp_association *asoc)
9416 struct inet_sock *inet = inet_sk(sk);
9417 struct inet_sock *newinet;
9418 struct sctp_sock *sp = sctp_sk(sk);
9420 newsk->sk_type = sk->sk_type;
9421 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9422 newsk->sk_flags = sk->sk_flags;
9423 newsk->sk_tsflags = sk->sk_tsflags;
9424 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9425 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9426 newsk->sk_reuse = sk->sk_reuse;
9427 sctp_sk(newsk)->reuse = sp->reuse;
9429 newsk->sk_shutdown = sk->sk_shutdown;
9430 newsk->sk_destruct = sctp_destruct_sock;
9431 newsk->sk_family = sk->sk_family;
9432 newsk->sk_protocol = IPPROTO_SCTP;
9433 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9434 newsk->sk_sndbuf = sk->sk_sndbuf;
9435 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9436 newsk->sk_lingertime = sk->sk_lingertime;
9437 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9438 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9439 newsk->sk_rxhash = sk->sk_rxhash;
9441 newinet = inet_sk(newsk);
9443 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9444 * getsockname() and getpeername()
9446 newinet->inet_sport = inet->inet_sport;
9447 newinet->inet_saddr = inet->inet_saddr;
9448 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9449 newinet->inet_dport = htons(asoc->peer.port);
9450 newinet->pmtudisc = inet->pmtudisc;
9451 newinet->inet_id = prandom_u32();
9453 newinet->uc_ttl = inet->uc_ttl;
9454 newinet->mc_loop = 1;
9455 newinet->mc_ttl = 1;
9456 newinet->mc_index = 0;
9457 newinet->mc_list = NULL;
9459 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9460 net_enable_timestamp();
9462 /* Set newsk security attributes from original sk and connection
9463 * security attribute from asoc.
9465 security_sctp_sk_clone(asoc, sk, newsk);
9468 static inline void sctp_copy_descendant(struct sock *sk_to,
9469 const struct sock *sk_from)
9471 size_t ancestor_size = sizeof(struct inet_sock);
9473 ancestor_size += sk_from->sk_prot->obj_size;
9474 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9475 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9478 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9479 * and its messages to the newsk.
9481 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9482 struct sctp_association *assoc,
9483 enum sctp_socket_type type)
9485 struct sctp_sock *oldsp = sctp_sk(oldsk);
9486 struct sctp_sock *newsp = sctp_sk(newsk);
9487 struct sctp_bind_bucket *pp; /* hash list port iterator */
9488 struct sctp_endpoint *newep = newsp->ep;
9489 struct sk_buff *skb, *tmp;
9490 struct sctp_ulpevent *event;
9491 struct sctp_bind_hashbucket *head;
9494 /* Migrate socket buffer sizes and all the socket level options to the
9497 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9498 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9499 /* Brute force copy old sctp opt. */
9500 sctp_copy_descendant(newsk, oldsk);
9502 /* Restore the ep value that was overwritten with the above structure
9508 /* Hook this new socket in to the bind_hash list. */
9509 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9510 inet_sk(oldsk)->inet_num)];
9511 spin_lock_bh(&head->lock);
9512 pp = sctp_sk(oldsk)->bind_hash;
9513 sk_add_bind_node(newsk, &pp->owner);
9514 sctp_sk(newsk)->bind_hash = pp;
9515 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9516 spin_unlock_bh(&head->lock);
9518 /* Copy the bind_addr list from the original endpoint to the new
9519 * endpoint so that we can handle restarts properly
9521 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9522 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9526 /* New ep's auth_hmacs should be set if old ep's is set, in case
9527 * that net->sctp.auth_enable has been changed to 0 by users and
9528 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9530 if (oldsp->ep->auth_hmacs) {
9531 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9536 sctp_auto_asconf_init(newsp);
9538 /* Move any messages in the old socket's receive queue that are for the
9539 * peeled off association to the new socket's receive queue.
9541 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9542 event = sctp_skb2event(skb);
9543 if (event->asoc == assoc) {
9544 __skb_unlink(skb, &oldsk->sk_receive_queue);
9545 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9546 sctp_skb_set_owner_r_frag(skb, newsk);
9550 /* Clean up any messages pending delivery due to partial
9551 * delivery. Three cases:
9552 * 1) No partial deliver; no work.
9553 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9554 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9556 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9558 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9559 struct sk_buff_head *queue;
9561 /* Decide which queue to move pd_lobby skbs to. */
9562 if (assoc->ulpq.pd_mode) {
9563 queue = &newsp->pd_lobby;
9565 queue = &newsk->sk_receive_queue;
9567 /* Walk through the pd_lobby, looking for skbs that
9568 * need moved to the new socket.
9570 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9571 event = sctp_skb2event(skb);
9572 if (event->asoc == assoc) {
9573 __skb_unlink(skb, &oldsp->pd_lobby);
9574 __skb_queue_tail(queue, skb);
9575 sctp_skb_set_owner_r_frag(skb, newsk);
9579 /* Clear up any skbs waiting for the partial
9580 * delivery to finish.
9582 if (assoc->ulpq.pd_mode)
9583 sctp_clear_pd(oldsk, NULL);
9587 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9589 /* Set the type of socket to indicate that it is peeled off from the
9590 * original UDP-style socket or created with the accept() call on a
9591 * TCP-style socket..
9595 /* Mark the new socket "in-use" by the user so that any packets
9596 * that may arrive on the association after we've moved it are
9597 * queued to the backlog. This prevents a potential race between
9598 * backlog processing on the old socket and new-packet processing
9599 * on the new socket.
9601 * The caller has just allocated newsk so we can guarantee that other
9602 * paths won't try to lock it and then oldsk.
9604 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9605 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9606 sctp_assoc_migrate(assoc, newsk);
9607 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9609 /* If the association on the newsk is already closed before accept()
9610 * is called, set RCV_SHUTDOWN flag.
9612 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9613 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9614 newsk->sk_shutdown |= RCV_SHUTDOWN;
9616 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9619 release_sock(newsk);
9625 /* This proto struct describes the ULP interface for SCTP. */
9626 struct proto sctp_prot = {
9628 .owner = THIS_MODULE,
9629 .close = sctp_close,
9630 .disconnect = sctp_disconnect,
9631 .accept = sctp_accept,
9632 .ioctl = sctp_ioctl,
9633 .init = sctp_init_sock,
9634 .destroy = sctp_destroy_sock,
9635 .shutdown = sctp_shutdown,
9636 .setsockopt = sctp_setsockopt,
9637 .getsockopt = sctp_getsockopt,
9638 .sendmsg = sctp_sendmsg,
9639 .recvmsg = sctp_recvmsg,
9641 .bind_add = sctp_bind_add,
9642 .backlog_rcv = sctp_backlog_rcv,
9644 .unhash = sctp_unhash,
9645 .no_autobind = true,
9646 .obj_size = sizeof(struct sctp_sock),
9647 .useroffset = offsetof(struct sctp_sock, subscribe),
9648 .usersize = offsetof(struct sctp_sock, initmsg) -
9649 offsetof(struct sctp_sock, subscribe) +
9650 sizeof_field(struct sctp_sock, initmsg),
9651 .sysctl_mem = sysctl_sctp_mem,
9652 .sysctl_rmem = sysctl_sctp_rmem,
9653 .sysctl_wmem = sysctl_sctp_wmem,
9654 .memory_pressure = &sctp_memory_pressure,
9655 .enter_memory_pressure = sctp_enter_memory_pressure,
9657 .memory_allocated = &sctp_memory_allocated,
9658 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9660 .sockets_allocated = &sctp_sockets_allocated,
9663 #if IS_ENABLED(CONFIG_IPV6)
9665 #include <net/transp_v6.h>
9666 static void sctp_v6_destroy_sock(struct sock *sk)
9668 sctp_destroy_sock(sk);
9669 inet6_destroy_sock(sk);
9672 struct proto sctpv6_prot = {
9674 .owner = THIS_MODULE,
9675 .close = sctp_close,
9676 .disconnect = sctp_disconnect,
9677 .accept = sctp_accept,
9678 .ioctl = sctp_ioctl,
9679 .init = sctp_init_sock,
9680 .destroy = sctp_v6_destroy_sock,
9681 .shutdown = sctp_shutdown,
9682 .setsockopt = sctp_setsockopt,
9683 .getsockopt = sctp_getsockopt,
9684 .sendmsg = sctp_sendmsg,
9685 .recvmsg = sctp_recvmsg,
9687 .bind_add = sctp_bind_add,
9688 .backlog_rcv = sctp_backlog_rcv,
9690 .unhash = sctp_unhash,
9691 .no_autobind = true,
9692 .obj_size = sizeof(struct sctp6_sock),
9693 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9694 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9695 offsetof(struct sctp6_sock, sctp.subscribe) +
9696 sizeof_field(struct sctp6_sock, sctp.initmsg),
9697 .sysctl_mem = sysctl_sctp_mem,
9698 .sysctl_rmem = sysctl_sctp_rmem,
9699 .sysctl_wmem = sysctl_sctp_wmem,
9700 .memory_pressure = &sctp_memory_pressure,
9701 .enter_memory_pressure = sctp_enter_memory_pressure,
9703 .memory_allocated = &sctp_memory_allocated,
9704 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9706 .sockets_allocated = &sctp_sockets_allocated,
9708 #endif /* IS_ENABLED(CONFIG_IPV6) */