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
23 * Written or modified by:
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 struct percpu_counter sctp_sockets_allocated;
98 static void sctp_enter_memory_pressure(struct sock *sk)
100 sctp_memory_pressure = 1;
104 /* Get the sndbuf space available at the time on the association. */
105 static inline int sctp_wspace(struct sctp_association *asoc)
107 struct sock *sk = asoc->base.sk;
109 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
110 : sk_stream_wspace(sk);
113 /* Increment the used sndbuf space count of the corresponding association by
114 * the size of the outgoing data chunk.
115 * Also, set the skb destructor for sndbuf accounting later.
117 * Since it is always 1-1 between chunk and skb, and also a new skb is always
118 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
119 * destructor in the data chunk skb for the purpose of the sndbuf space
122 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
124 struct sctp_association *asoc = chunk->asoc;
125 struct sock *sk = asoc->base.sk;
127 /* The sndbuf space is tracked per association. */
128 sctp_association_hold(asoc);
131 sctp_auth_shkey_hold(chunk->shkey);
133 skb_set_owner_w(chunk->skb, sk);
135 chunk->skb->destructor = sctp_wfree;
136 /* Save the chunk pointer in skb for sctp_wfree to use later. */
137 skb_shinfo(chunk->skb)->destructor_arg = chunk;
139 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
140 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
141 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 sk_mem_charge(sk, chunk->skb->truesize);
145 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
147 skb_orphan(chunk->skb);
150 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
151 void (*cb)(struct sctp_chunk *))
154 struct sctp_outq *q = &asoc->outqueue;
155 struct sctp_transport *t;
156 struct sctp_chunk *chunk;
158 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
159 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
162 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
165 list_for_each_entry(chunk, &q->sacked, transmitted_list)
168 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
171 list_for_each_entry(chunk, &q->out_chunk_list, list)
175 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
176 void (*cb)(struct sk_buff *, struct sock *))
179 struct sk_buff *skb, *tmp;
181 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
184 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
187 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
191 /* Verify that this is a valid address. */
192 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
197 /* Verify basic sockaddr. */
198 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
202 /* Is this a valid SCTP address? */
203 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
206 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
212 /* Look up the association by its id. If this is not a UDP-style
213 * socket, the ID field is always ignored.
215 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
217 struct sctp_association *asoc = NULL;
219 /* If this is not a UDP-style socket, assoc id should be ignored. */
220 if (!sctp_style(sk, UDP)) {
221 /* Return NULL if the socket state is not ESTABLISHED. It
222 * could be a TCP-style listening socket or a socket which
223 * hasn't yet called connect() to establish an association.
225 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
228 /* Get the first and the only association from the list. */
229 if (!list_empty(&sctp_sk(sk)->ep->asocs))
230 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
231 struct sctp_association, asocs);
235 /* Otherwise this is a UDP-style socket. */
236 if (id <= SCTP_ALL_ASSOC)
239 spin_lock_bh(&sctp_assocs_id_lock);
240 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
241 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
243 spin_unlock_bh(&sctp_assocs_id_lock);
248 /* Look up the transport from an address and an assoc id. If both address and
249 * id are specified, the associations matching the address and the id should be
252 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
253 struct sockaddr_storage *addr,
256 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
257 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
258 union sctp_addr *laddr = (union sctp_addr *)addr;
259 struct sctp_transport *transport;
261 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
264 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
271 id_asoc = sctp_id2assoc(sk, id);
272 if (id_asoc && (id_asoc != addr_asoc))
275 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
276 (union sctp_addr *)addr);
281 /* API 3.1.2 bind() - UDP Style Syntax
282 * The syntax of bind() is,
284 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
286 * sd - the socket descriptor returned by socket().
287 * addr - the address structure (struct sockaddr_in or struct
288 * sockaddr_in6 [RFC 2553]),
289 * addr_len - the size of the address structure.
291 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
297 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
300 /* Disallow binding twice. */
301 if (!sctp_sk(sk)->ep->base.bind_addr.port)
302 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
312 static int sctp_get_port_local(struct sock *, union sctp_addr *);
314 /* Verify this is a valid sockaddr. */
315 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
316 union sctp_addr *addr, int len)
320 /* Check minimum size. */
321 if (len < sizeof (struct sockaddr))
324 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
327 if (addr->sa.sa_family == AF_INET6) {
328 if (len < SIN6_LEN_RFC2133)
330 /* V4 mapped address are really of AF_INET family */
331 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
332 !opt->pf->af_supported(AF_INET, opt))
336 /* If we get this far, af is valid. */
337 af = sctp_get_af_specific(addr->sa.sa_family);
339 if (len < af->sockaddr_len)
345 /* Bind a local address either to an endpoint or to an association. */
346 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
348 struct net *net = sock_net(sk);
349 struct sctp_sock *sp = sctp_sk(sk);
350 struct sctp_endpoint *ep = sp->ep;
351 struct sctp_bind_addr *bp = &ep->base.bind_addr;
356 /* Common sockaddr verification. */
357 af = sctp_sockaddr_af(sp, addr, len);
359 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
360 __func__, sk, addr, len);
364 snum = ntohs(addr->v4.sin_port);
366 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
367 __func__, sk, &addr->sa, bp->port, snum, len);
369 /* PF specific bind() address verification. */
370 if (!sp->pf->bind_verify(sp, addr))
371 return -EADDRNOTAVAIL;
373 /* We must either be unbound, or bind to the same port.
374 * It's OK to allow 0 ports if we are already bound.
375 * We'll just inhert an already bound port in this case
380 else if (snum != bp->port) {
381 pr_debug("%s: new port %d doesn't match existing port "
382 "%d\n", __func__, snum, bp->port);
387 if (snum && snum < inet_prot_sock(net) &&
388 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
391 /* See if the address matches any of the addresses we may have
392 * already bound before checking against other endpoints.
394 if (sctp_bind_addr_match(bp, addr, sp))
397 /* Make sure we are allowed to bind here.
398 * The function sctp_get_port_local() does duplicate address
401 addr->v4.sin_port = htons(snum);
402 if (sctp_get_port_local(sk, addr))
405 /* Refresh ephemeral port. */
407 bp->port = inet_sk(sk)->inet_num;
409 /* Add the address to the bind address list.
410 * Use GFP_ATOMIC since BHs will be disabled.
412 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
413 SCTP_ADDR_SRC, GFP_ATOMIC);
419 /* Copy back into socket for getsockname() use. */
420 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
421 sp->pf->to_sk_saddr(addr, sk);
426 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
428 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
429 * at any one time. If a sender, after sending an ASCONF chunk, decides
430 * it needs to transfer another ASCONF Chunk, it MUST wait until the
431 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
432 * subsequent ASCONF. Note this restriction binds each side, so at any
433 * time two ASCONF may be in-transit on any given association (one sent
434 * from each endpoint).
436 static int sctp_send_asconf(struct sctp_association *asoc,
437 struct sctp_chunk *chunk)
439 struct net *net = sock_net(asoc->base.sk);
442 /* If there is an outstanding ASCONF chunk, queue it for later
445 if (asoc->addip_last_asconf) {
446 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
450 /* Hold the chunk until an ASCONF_ACK is received. */
451 sctp_chunk_hold(chunk);
452 retval = sctp_primitive_ASCONF(net, asoc, chunk);
454 sctp_chunk_free(chunk);
456 asoc->addip_last_asconf = chunk;
462 /* Add a list of addresses as bind addresses to local endpoint or
465 * Basically run through each address specified in the addrs/addrcnt
466 * array/length pair, determine if it is IPv6 or IPv4 and call
467 * sctp_do_bind() on it.
469 * If any of them fails, then the operation will be reversed and the
470 * ones that were added will be removed.
472 * Only sctp_setsockopt_bindx() is supposed to call this function.
474 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
479 struct sockaddr *sa_addr;
482 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
486 for (cnt = 0; cnt < addrcnt; cnt++) {
487 /* The list may contain either IPv4 or IPv6 address;
488 * determine the address length for walking thru the list.
491 af = sctp_get_af_specific(sa_addr->sa_family);
497 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
500 addr_buf += af->sockaddr_len;
504 /* Failed. Cleanup the ones that have been added */
506 sctp_bindx_rem(sk, addrs, cnt);
514 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
515 * associations that are part of the endpoint indicating that a list of local
516 * addresses are added to the endpoint.
518 * If any of the addresses is already in the bind address list of the
519 * association, we do not send the chunk for that association. But it will not
520 * affect other associations.
522 * Only sctp_setsockopt_bindx() is supposed to call this function.
524 static int sctp_send_asconf_add_ip(struct sock *sk,
525 struct sockaddr *addrs,
528 struct sctp_sock *sp;
529 struct sctp_endpoint *ep;
530 struct sctp_association *asoc;
531 struct sctp_bind_addr *bp;
532 struct sctp_chunk *chunk;
533 struct sctp_sockaddr_entry *laddr;
534 union sctp_addr *addr;
535 union sctp_addr saveaddr;
545 if (!ep->asconf_enable)
548 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
549 __func__, sk, addrs, addrcnt);
551 list_for_each_entry(asoc, &ep->asocs, asocs) {
552 if (!asoc->peer.asconf_capable)
555 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
558 if (!sctp_state(asoc, ESTABLISHED))
561 /* Check if any address in the packed array of addresses is
562 * in the bind address list of the association. If so,
563 * do not send the asconf chunk to its peer, but continue with
564 * other associations.
567 for (i = 0; i < addrcnt; i++) {
569 af = sctp_get_af_specific(addr->v4.sin_family);
575 if (sctp_assoc_lookup_laddr(asoc, addr))
578 addr_buf += af->sockaddr_len;
583 /* Use the first valid address in bind addr list of
584 * association as Address Parameter of ASCONF CHUNK.
586 bp = &asoc->base.bind_addr;
587 p = bp->address_list.next;
588 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
589 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
590 addrcnt, SCTP_PARAM_ADD_IP);
596 /* Add the new addresses to the bind address list with
597 * use_as_src set to 0.
600 for (i = 0; i < addrcnt; i++) {
602 af = sctp_get_af_specific(addr->v4.sin_family);
603 memcpy(&saveaddr, addr, af->sockaddr_len);
604 retval = sctp_add_bind_addr(bp, &saveaddr,
606 SCTP_ADDR_NEW, GFP_ATOMIC);
607 addr_buf += af->sockaddr_len;
609 if (asoc->src_out_of_asoc_ok) {
610 struct sctp_transport *trans;
612 list_for_each_entry(trans,
613 &asoc->peer.transport_addr_list, transports) {
614 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
615 2*asoc->pathmtu, 4380));
616 trans->ssthresh = asoc->peer.i.a_rwnd;
617 trans->rto = asoc->rto_initial;
618 sctp_max_rto(asoc, trans);
619 trans->rtt = trans->srtt = trans->rttvar = 0;
620 /* Clear the source and route cache */
621 sctp_transport_route(trans, NULL,
622 sctp_sk(asoc->base.sk));
625 retval = sctp_send_asconf(asoc, chunk);
632 /* Remove a list of addresses from bind addresses list. Do not remove the
635 * Basically run through each address specified in the addrs/addrcnt
636 * array/length pair, determine if it is IPv6 or IPv4 and call
637 * sctp_del_bind() on it.
639 * If any of them fails, then the operation will be reversed and the
640 * ones that were removed will be added back.
642 * At least one address has to be left; if only one address is
643 * available, the operation will return -EBUSY.
645 * Only sctp_setsockopt_bindx() is supposed to call this function.
647 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
649 struct sctp_sock *sp = sctp_sk(sk);
650 struct sctp_endpoint *ep = sp->ep;
652 struct sctp_bind_addr *bp = &ep->base.bind_addr;
655 union sctp_addr *sa_addr;
658 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
659 __func__, sk, addrs, addrcnt);
662 for (cnt = 0; cnt < addrcnt; cnt++) {
663 /* If the bind address list is empty or if there is only one
664 * bind address, there is nothing more to be removed (we need
665 * at least one address here).
667 if (list_empty(&bp->address_list) ||
668 (sctp_list_single_entry(&bp->address_list))) {
674 af = sctp_get_af_specific(sa_addr->sa.sa_family);
680 if (!af->addr_valid(sa_addr, sp, NULL)) {
681 retval = -EADDRNOTAVAIL;
685 if (sa_addr->v4.sin_port &&
686 sa_addr->v4.sin_port != htons(bp->port)) {
691 if (!sa_addr->v4.sin_port)
692 sa_addr->v4.sin_port = htons(bp->port);
694 /* FIXME - There is probably a need to check if sk->sk_saddr and
695 * sk->sk_rcv_addr are currently set to one of the addresses to
696 * be removed. This is something which needs to be looked into
697 * when we are fixing the outstanding issues with multi-homing
698 * socket routing and failover schemes. Refer to comments in
699 * sctp_do_bind(). -daisy
701 retval = sctp_del_bind_addr(bp, sa_addr);
703 addr_buf += af->sockaddr_len;
706 /* Failed. Add the ones that has been removed back */
708 sctp_bindx_add(sk, addrs, cnt);
716 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
717 * the associations that are part of the endpoint indicating that a list of
718 * local addresses are removed from the endpoint.
720 * If any of the addresses is already in the bind address list of the
721 * association, we do not send the chunk for that association. But it will not
722 * affect other associations.
724 * Only sctp_setsockopt_bindx() is supposed to call this function.
726 static int sctp_send_asconf_del_ip(struct sock *sk,
727 struct sockaddr *addrs,
730 struct sctp_sock *sp;
731 struct sctp_endpoint *ep;
732 struct sctp_association *asoc;
733 struct sctp_transport *transport;
734 struct sctp_bind_addr *bp;
735 struct sctp_chunk *chunk;
736 union sctp_addr *laddr;
739 struct sctp_sockaddr_entry *saddr;
748 if (!ep->asconf_enable)
751 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
752 __func__, sk, addrs, addrcnt);
754 list_for_each_entry(asoc, &ep->asocs, asocs) {
756 if (!asoc->peer.asconf_capable)
759 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
762 if (!sctp_state(asoc, ESTABLISHED))
765 /* Check if any address in the packed array of addresses is
766 * not present in the bind address list of the association.
767 * If so, do not send the asconf chunk to its peer, but
768 * continue with other associations.
771 for (i = 0; i < addrcnt; i++) {
773 af = sctp_get_af_specific(laddr->v4.sin_family);
779 if (!sctp_assoc_lookup_laddr(asoc, laddr))
782 addr_buf += af->sockaddr_len;
787 /* Find one address in the association's bind address list
788 * that is not in the packed array of addresses. This is to
789 * make sure that we do not delete all the addresses in the
792 bp = &asoc->base.bind_addr;
793 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
795 if ((laddr == NULL) && (addrcnt == 1)) {
796 if (asoc->asconf_addr_del_pending)
798 asoc->asconf_addr_del_pending =
799 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
800 if (asoc->asconf_addr_del_pending == NULL) {
804 asoc->asconf_addr_del_pending->sa.sa_family =
806 asoc->asconf_addr_del_pending->v4.sin_port =
808 if (addrs->sa_family == AF_INET) {
809 struct sockaddr_in *sin;
811 sin = (struct sockaddr_in *)addrs;
812 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
813 } else if (addrs->sa_family == AF_INET6) {
814 struct sockaddr_in6 *sin6;
816 sin6 = (struct sockaddr_in6 *)addrs;
817 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
820 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
821 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
822 asoc->asconf_addr_del_pending);
824 asoc->src_out_of_asoc_ok = 1;
832 /* We do not need RCU protection throughout this loop
833 * because this is done under a socket lock from the
836 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
844 /* Reset use_as_src flag for the addresses in the bind address
845 * list that are to be deleted.
848 for (i = 0; i < addrcnt; i++) {
850 af = sctp_get_af_specific(laddr->v4.sin_family);
851 list_for_each_entry(saddr, &bp->address_list, list) {
852 if (sctp_cmp_addr_exact(&saddr->a, laddr))
853 saddr->state = SCTP_ADDR_DEL;
855 addr_buf += af->sockaddr_len;
858 /* Update the route and saddr entries for all the transports
859 * as some of the addresses in the bind address list are
860 * about to be deleted and cannot be used as source addresses.
862 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
864 sctp_transport_route(transport, NULL,
865 sctp_sk(asoc->base.sk));
869 /* We don't need to transmit ASCONF */
871 retval = sctp_send_asconf(asoc, chunk);
877 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
878 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
880 struct sock *sk = sctp_opt2sk(sp);
881 union sctp_addr *addr;
884 /* It is safe to write port space in caller. */
886 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
887 af = sctp_get_af_specific(addr->sa.sa_family);
890 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
893 if (addrw->state == SCTP_ADDR_NEW)
894 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
896 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
899 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
902 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
905 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
906 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
909 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
910 * Section 3.1.2 for this usage.
912 * addrs is a pointer to an array of one or more socket addresses. Each
913 * address is contained in its appropriate structure (i.e. struct
914 * sockaddr_in or struct sockaddr_in6) the family of the address type
915 * must be used to distinguish the address length (note that this
916 * representation is termed a "packed array" of addresses). The caller
917 * specifies the number of addresses in the array with addrcnt.
919 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
920 * -1, and sets errno to the appropriate error code.
922 * For SCTP, the port given in each socket address must be the same, or
923 * sctp_bindx() will fail, setting errno to EINVAL.
925 * The flags parameter is formed from the bitwise OR of zero or more of
926 * the following currently defined flags:
928 * SCTP_BINDX_ADD_ADDR
930 * SCTP_BINDX_REM_ADDR
932 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
933 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
934 * addresses from the association. The two flags are mutually exclusive;
935 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
936 * not remove all addresses from an association; sctp_bindx() will
937 * reject such an attempt with EINVAL.
939 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
940 * additional addresses with an endpoint after calling bind(). Or use
941 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
942 * socket is associated with so that no new association accepted will be
943 * associated with those addresses. If the endpoint supports dynamic
944 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
945 * endpoint to send the appropriate message to the peer to change the
946 * peers address lists.
948 * Adding and removing addresses from a connected association is
949 * optional functionality. Implementations that do not support this
950 * functionality should return EOPNOTSUPP.
952 * Basically do nothing but copying the addresses from user to kernel
953 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
954 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
957 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
960 * sk The sk of the socket
961 * addrs The pointer to the addresses in user land
962 * addrssize Size of the addrs buffer
963 * op Operation to perform (add or remove, see the flags of
966 * Returns 0 if ok, <0 errno code on error.
968 static int sctp_setsockopt_bindx(struct sock *sk,
969 struct sockaddr __user *addrs,
970 int addrs_size, int op)
972 struct sockaddr *kaddrs;
976 struct sockaddr *sa_addr;
980 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
981 __func__, sk, addrs, addrs_size, op);
983 if (unlikely(addrs_size <= 0))
986 kaddrs = memdup_user(addrs, addrs_size);
988 return PTR_ERR(kaddrs);
990 /* Walk through the addrs buffer and count the number of addresses. */
992 while (walk_size < addrs_size) {
993 if (walk_size + sizeof(sa_family_t) > addrs_size) {
999 af = sctp_get_af_specific(sa_addr->sa_family);
1001 /* If the address family is not supported or if this address
1002 * causes the address buffer to overflow return EINVAL.
1004 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1009 addr_buf += af->sockaddr_len;
1010 walk_size += af->sockaddr_len;
1015 case SCTP_BINDX_ADD_ADDR:
1016 /* Allow security module to validate bindx addresses. */
1017 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1018 (struct sockaddr *)kaddrs,
1022 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1025 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1028 case SCTP_BINDX_REM_ADDR:
1029 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1032 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1046 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1047 const union sctp_addr *daddr,
1048 const struct sctp_initmsg *init,
1049 struct sctp_transport **tp)
1051 struct sctp_association *asoc;
1052 struct sock *sk = ep->base.sk;
1053 struct net *net = sock_net(sk);
1054 enum sctp_scope scope;
1057 if (sctp_endpoint_is_peeled_off(ep, daddr))
1058 return -EADDRNOTAVAIL;
1060 if (!ep->base.bind_addr.port) {
1061 if (sctp_autobind(sk))
1064 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1065 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1069 scope = sctp_scope(daddr);
1070 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1074 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1078 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1087 if (init->sinit_num_ostreams) {
1088 __u16 outcnt = init->sinit_num_ostreams;
1090 asoc->c.sinit_num_ostreams = outcnt;
1091 /* outcnt has been changed, need to re-init stream */
1092 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1097 if (init->sinit_max_instreams)
1098 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1100 if (init->sinit_max_attempts)
1101 asoc->max_init_attempts = init->sinit_max_attempts;
1103 if (init->sinit_max_init_timeo)
1104 asoc->max_init_timeo =
1105 msecs_to_jiffies(init->sinit_max_init_timeo);
1109 sctp_association_free(asoc);
1113 static int sctp_connect_add_peer(struct sctp_association *asoc,
1114 union sctp_addr *daddr, int addr_len)
1116 struct sctp_endpoint *ep = asoc->ep;
1117 struct sctp_association *old;
1118 struct sctp_transport *t;
1121 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1125 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1126 if (old && old != asoc)
1127 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1130 if (sctp_endpoint_is_peeled_off(ep, daddr))
1131 return -EADDRNOTAVAIL;
1133 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1140 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1142 * Common routine for handling connect() and sctp_connectx().
1143 * Connect will come in with just a single address.
1145 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1146 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1148 struct sctp_sock *sp = sctp_sk(sk);
1149 struct sctp_endpoint *ep = sp->ep;
1150 struct sctp_transport *transport;
1151 struct sctp_association *asoc;
1152 void *addr_buf = kaddrs;
1153 union sctp_addr *daddr;
1158 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1159 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1163 af = sctp_get_af_specific(daddr->sa.sa_family);
1164 if (!af || af->sockaddr_len > addrs_size)
1167 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1171 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1173 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1176 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1179 asoc = transport->asoc;
1181 addr_buf += af->sockaddr_len;
1182 walk_size = af->sockaddr_len;
1183 while (walk_size < addrs_size) {
1185 if (walk_size + sizeof(sa_family_t) > addrs_size)
1189 af = sctp_get_af_specific(daddr->sa.sa_family);
1190 if (!af || af->sockaddr_len + walk_size > addrs_size)
1193 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1196 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1200 addr_buf += af->sockaddr_len;
1201 walk_size += af->sockaddr_len;
1204 /* In case the user of sctp_connectx() wants an association
1205 * id back, assign one now.
1208 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1213 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1217 /* Initialize sk's dport and daddr for getpeername() */
1218 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1219 sp->pf->to_sk_daddr(daddr, sk);
1223 *assoc_id = asoc->assoc_id;
1225 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1226 return sctp_wait_for_connect(asoc, &timeo);
1229 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1230 __func__, asoc, kaddrs, err);
1231 sctp_association_free(asoc);
1235 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1238 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1239 * sctp_assoc_t *asoc);
1241 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1242 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1243 * or IPv6 addresses.
1245 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1246 * Section 3.1.2 for this usage.
1248 * addrs is a pointer to an array of one or more socket addresses. Each
1249 * address is contained in its appropriate structure (i.e. struct
1250 * sockaddr_in or struct sockaddr_in6) the family of the address type
1251 * must be used to distengish the address length (note that this
1252 * representation is termed a "packed array" of addresses). The caller
1253 * specifies the number of addresses in the array with addrcnt.
1255 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1256 * the association id of the new association. On failure, sctp_connectx()
1257 * returns -1, and sets errno to the appropriate error code. The assoc_id
1258 * is not touched by the kernel.
1260 * For SCTP, the port given in each socket address must be the same, or
1261 * sctp_connectx() will fail, setting errno to EINVAL.
1263 * An application can use sctp_connectx to initiate an association with
1264 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1265 * allows a caller to specify multiple addresses at which a peer can be
1266 * reached. The way the SCTP stack uses the list of addresses to set up
1267 * the association is implementation dependent. This function only
1268 * specifies that the stack will try to make use of all the addresses in
1269 * the list when needed.
1271 * Note that the list of addresses passed in is only used for setting up
1272 * the association. It does not necessarily equal the set of addresses
1273 * the peer uses for the resulting association. If the caller wants to
1274 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1275 * retrieve them after the association has been set up.
1277 * Basically do nothing but copying the addresses from user to kernel
1278 * land and invoking either sctp_connectx(). This is used for tunneling
1279 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1281 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1284 * sk The sk of the socket
1285 * addrs The pointer to the addresses in user land
1286 * addrssize Size of the addrs buffer
1288 * Returns >=0 if ok, <0 errno code on error.
1290 static int __sctp_setsockopt_connectx(struct sock *sk,
1291 struct sockaddr __user *addrs,
1293 sctp_assoc_t *assoc_id)
1295 struct sockaddr *kaddrs;
1296 int err = 0, flags = 0;
1298 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1299 __func__, sk, addrs, addrs_size);
1301 /* make sure the 1st addr's sa_family is accessible later */
1302 if (unlikely(addrs_size < sizeof(sa_family_t)))
1305 kaddrs = memdup_user(addrs, addrs_size);
1307 return PTR_ERR(kaddrs);
1309 /* Allow security module to validate connectx addresses. */
1310 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1311 (struct sockaddr *)kaddrs,
1316 /* in-kernel sockets don't generally have a file allocated to them
1317 * if all they do is call sock_create_kern().
1319 if (sk->sk_socket->file)
1320 flags = sk->sk_socket->file->f_flags;
1322 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1331 * This is an older interface. It's kept for backward compatibility
1332 * to the option that doesn't provide association id.
1334 static int sctp_setsockopt_connectx_old(struct sock *sk,
1335 struct sockaddr __user *addrs,
1338 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1342 * New interface for the API. The since the API is done with a socket
1343 * option, to make it simple we feed back the association id is as a return
1344 * indication to the call. Error is always negative and association id is
1347 static int sctp_setsockopt_connectx(struct sock *sk,
1348 struct sockaddr __user *addrs,
1351 sctp_assoc_t assoc_id = 0;
1354 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1363 * New (hopefully final) interface for the API.
1364 * We use the sctp_getaddrs_old structure so that use-space library
1365 * can avoid any unnecessary allocations. The only different part
1366 * is that we store the actual length of the address buffer into the
1367 * addrs_num structure member. That way we can re-use the existing
1370 #ifdef CONFIG_COMPAT
1371 struct compat_sctp_getaddrs_old {
1372 sctp_assoc_t assoc_id;
1374 compat_uptr_t addrs; /* struct sockaddr * */
1378 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1379 char __user *optval,
1382 struct sctp_getaddrs_old param;
1383 sctp_assoc_t assoc_id = 0;
1386 #ifdef CONFIG_COMPAT
1387 if (in_compat_syscall()) {
1388 struct compat_sctp_getaddrs_old param32;
1390 if (len < sizeof(param32))
1392 if (copy_from_user(¶m32, optval, sizeof(param32)))
1395 param.assoc_id = param32.assoc_id;
1396 param.addr_num = param32.addr_num;
1397 param.addrs = compat_ptr(param32.addrs);
1401 if (len < sizeof(param))
1403 if (copy_from_user(¶m, optval, sizeof(param)))
1407 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1408 param.addrs, param.addr_num,
1410 if (err == 0 || err == -EINPROGRESS) {
1411 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1413 if (put_user(sizeof(assoc_id), optlen))
1420 /* API 3.1.4 close() - UDP Style Syntax
1421 * Applications use close() to perform graceful shutdown (as described in
1422 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1423 * by a UDP-style socket.
1427 * ret = close(int sd);
1429 * sd - the socket descriptor of the associations to be closed.
1431 * To gracefully shutdown a specific association represented by the
1432 * UDP-style socket, an application should use the sendmsg() call,
1433 * passing no user data, but including the appropriate flag in the
1434 * ancillary data (see Section xxxx).
1436 * If sd in the close() call is a branched-off socket representing only
1437 * one association, the shutdown is performed on that association only.
1439 * 4.1.6 close() - TCP Style Syntax
1441 * Applications use close() to gracefully close down an association.
1445 * int close(int sd);
1447 * sd - the socket descriptor of the association to be closed.
1449 * After an application calls close() on a socket descriptor, no further
1450 * socket operations will succeed on that descriptor.
1452 * API 7.1.4 SO_LINGER
1454 * An application using the TCP-style socket can use this option to
1455 * perform the SCTP ABORT primitive. The linger option structure is:
1458 * int l_onoff; // option on/off
1459 * int l_linger; // linger time
1462 * To enable the option, set l_onoff to 1. If the l_linger value is set
1463 * to 0, calling close() is the same as the ABORT primitive. If the
1464 * value is set to a negative value, the setsockopt() call will return
1465 * an error. If the value is set to a positive value linger_time, the
1466 * close() can be blocked for at most linger_time ms. If the graceful
1467 * shutdown phase does not finish during this period, close() will
1468 * return but the graceful shutdown phase continues in the system.
1470 static void sctp_close(struct sock *sk, long timeout)
1472 struct net *net = sock_net(sk);
1473 struct sctp_endpoint *ep;
1474 struct sctp_association *asoc;
1475 struct list_head *pos, *temp;
1476 unsigned int data_was_unread;
1478 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1481 sk->sk_shutdown = SHUTDOWN_MASK;
1482 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1484 ep = sctp_sk(sk)->ep;
1486 /* Clean up any skbs sitting on the receive queue. */
1487 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1488 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1490 /* Walk all associations on an endpoint. */
1491 list_for_each_safe(pos, temp, &ep->asocs) {
1492 asoc = list_entry(pos, struct sctp_association, asocs);
1494 if (sctp_style(sk, TCP)) {
1495 /* A closed association can still be in the list if
1496 * it belongs to a TCP-style listening socket that is
1497 * not yet accepted. If so, free it. If not, send an
1498 * ABORT or SHUTDOWN based on the linger options.
1500 if (sctp_state(asoc, CLOSED)) {
1501 sctp_association_free(asoc);
1506 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1507 !skb_queue_empty(&asoc->ulpq.reasm) ||
1508 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1509 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1510 struct sctp_chunk *chunk;
1512 chunk = sctp_make_abort_user(asoc, NULL, 0);
1513 sctp_primitive_ABORT(net, asoc, chunk);
1515 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1518 /* On a TCP-style socket, block for at most linger_time if set. */
1519 if (sctp_style(sk, TCP) && timeout)
1520 sctp_wait_for_close(sk, timeout);
1522 /* This will run the backlog queue. */
1525 /* Supposedly, no process has access to the socket, but
1526 * the net layers still may.
1527 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1528 * held and that should be grabbed before socket lock.
1530 spin_lock_bh(&net->sctp.addr_wq_lock);
1531 bh_lock_sock_nested(sk);
1533 /* Hold the sock, since sk_common_release() will put sock_put()
1534 * and we have just a little more cleanup.
1537 sk_common_release(sk);
1540 spin_unlock_bh(&net->sctp.addr_wq_lock);
1544 SCTP_DBG_OBJCNT_DEC(sock);
1547 /* Handle EPIPE error. */
1548 static int sctp_error(struct sock *sk, int flags, int err)
1551 err = sock_error(sk) ? : -EPIPE;
1552 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1553 send_sig(SIGPIPE, current, 0);
1557 /* API 3.1.3 sendmsg() - UDP Style Syntax
1559 * An application uses sendmsg() and recvmsg() calls to transmit data to
1560 * and receive data from its peer.
1562 * ssize_t sendmsg(int socket, const struct msghdr *message,
1565 * socket - the socket descriptor of the endpoint.
1566 * message - pointer to the msghdr structure which contains a single
1567 * user message and possibly some ancillary data.
1569 * See Section 5 for complete description of the data
1572 * flags - flags sent or received with the user message, see Section
1573 * 5 for complete description of the flags.
1575 * Note: This function could use a rewrite especially when explicit
1576 * connect support comes in.
1578 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1580 static int sctp_msghdr_parse(const struct msghdr *msg,
1581 struct sctp_cmsgs *cmsgs);
1583 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1584 struct sctp_sndrcvinfo *srinfo,
1585 const struct msghdr *msg, size_t msg_len)
1590 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1593 if (msg_len > sk->sk_sndbuf)
1596 memset(cmsgs, 0, sizeof(*cmsgs));
1597 err = sctp_msghdr_parse(msg, cmsgs);
1599 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1603 memset(srinfo, 0, sizeof(*srinfo));
1604 if (cmsgs->srinfo) {
1605 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1606 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1607 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1608 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1609 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1610 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1614 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1615 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1616 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1617 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1618 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1621 if (cmsgs->prinfo) {
1622 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1623 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1624 cmsgs->prinfo->pr_policy);
1627 sflags = srinfo->sinfo_flags;
1628 if (!sflags && msg_len)
1631 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1634 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1635 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1638 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1644 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1645 struct sctp_cmsgs *cmsgs,
1646 union sctp_addr *daddr,
1647 struct sctp_transport **tp)
1649 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1650 struct sctp_association *asoc;
1651 struct cmsghdr *cmsg;
1652 __be32 flowinfo = 0;
1658 if (sflags & (SCTP_EOF | SCTP_ABORT))
1661 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1662 sctp_sstate(sk, CLOSING)))
1663 return -EADDRNOTAVAIL;
1665 /* Label connection socket for first association 1-to-many
1666 * style for client sequence socket()->sendmsg(). This
1667 * needs to be done before sctp_assoc_add_peer() as that will
1668 * set up the initial packet that needs to account for any
1669 * security ip options (CIPSO/CALIPSO) added to the packet.
1671 af = sctp_get_af_specific(daddr->sa.sa_family);
1674 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1675 (struct sockaddr *)daddr,
1680 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1685 if (!cmsgs->addrs_msg)
1688 if (daddr->sa.sa_family == AF_INET6)
1689 flowinfo = daddr->v6.sin6_flowinfo;
1691 /* sendv addr list parse */
1692 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1693 union sctp_addr _daddr;
1696 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1697 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1698 cmsg->cmsg_type != SCTP_DSTADDRV6))
1702 memset(daddr, 0, sizeof(*daddr));
1703 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1704 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1705 if (dlen < sizeof(struct in_addr)) {
1710 dlen = sizeof(struct in_addr);
1711 daddr->v4.sin_family = AF_INET;
1712 daddr->v4.sin_port = htons(asoc->peer.port);
1713 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1715 if (dlen < sizeof(struct in6_addr)) {
1720 dlen = sizeof(struct in6_addr);
1721 daddr->v6.sin6_flowinfo = flowinfo;
1722 daddr->v6.sin6_family = AF_INET6;
1723 daddr->v6.sin6_port = htons(asoc->peer.port);
1724 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1727 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1735 sctp_association_free(asoc);
1739 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1740 __u16 sflags, struct msghdr *msg,
1743 struct sock *sk = asoc->base.sk;
1744 struct net *net = sock_net(sk);
1746 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1749 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1750 !sctp_state(asoc, ESTABLISHED))
1753 if (sflags & SCTP_EOF) {
1754 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1755 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1760 if (sflags & SCTP_ABORT) {
1761 struct sctp_chunk *chunk;
1763 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1767 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1768 sctp_primitive_ABORT(net, asoc, chunk);
1769 iov_iter_revert(&msg->msg_iter, msg_len);
1777 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1778 struct msghdr *msg, size_t msg_len,
1779 struct sctp_transport *transport,
1780 struct sctp_sndrcvinfo *sinfo)
1782 struct sock *sk = asoc->base.sk;
1783 struct sctp_sock *sp = sctp_sk(sk);
1784 struct net *net = sock_net(sk);
1785 struct sctp_datamsg *datamsg;
1786 bool wait_connect = false;
1787 struct sctp_chunk *chunk;
1791 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1796 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1797 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1802 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1807 if (asoc->pmtu_pending) {
1808 if (sp->param_flags & SPP_PMTUD_ENABLE)
1809 sctp_assoc_sync_pmtu(asoc);
1810 asoc->pmtu_pending = 0;
1813 if (sctp_wspace(asoc) < (int)msg_len)
1814 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1816 if (sk_under_memory_pressure(sk))
1819 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1820 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1821 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1826 if (sctp_state(asoc, CLOSED)) {
1827 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1831 if (asoc->ep->intl_enable) {
1832 timeo = sock_sndtimeo(sk, 0);
1833 err = sctp_wait_for_connect(asoc, &timeo);
1839 wait_connect = true;
1842 pr_debug("%s: we associated primitively\n", __func__);
1845 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1846 if (IS_ERR(datamsg)) {
1847 err = PTR_ERR(datamsg);
1851 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1853 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1854 sctp_chunk_hold(chunk);
1855 sctp_set_owner_w(chunk);
1856 chunk->transport = transport;
1859 err = sctp_primitive_SEND(net, asoc, datamsg);
1861 sctp_datamsg_free(datamsg);
1865 pr_debug("%s: we sent primitively\n", __func__);
1867 sctp_datamsg_put(datamsg);
1869 if (unlikely(wait_connect)) {
1870 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1871 sctp_wait_for_connect(asoc, &timeo);
1880 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1881 const struct msghdr *msg,
1882 struct sctp_cmsgs *cmsgs)
1884 union sctp_addr *daddr = NULL;
1887 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1888 int len = msg->msg_namelen;
1890 if (len > sizeof(*daddr))
1891 len = sizeof(*daddr);
1893 daddr = (union sctp_addr *)msg->msg_name;
1895 err = sctp_verify_addr(sk, daddr, len);
1897 return ERR_PTR(err);
1903 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1904 struct sctp_sndrcvinfo *sinfo,
1905 struct sctp_cmsgs *cmsgs)
1907 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1908 sinfo->sinfo_stream = asoc->default_stream;
1909 sinfo->sinfo_ppid = asoc->default_ppid;
1910 sinfo->sinfo_context = asoc->default_context;
1911 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1914 sinfo->sinfo_flags = asoc->default_flags;
1917 if (!cmsgs->srinfo && !cmsgs->prinfo)
1918 sinfo->sinfo_timetolive = asoc->default_timetolive;
1920 if (cmsgs->authinfo) {
1921 /* Reuse sinfo_tsn to indicate that authinfo was set and
1922 * sinfo_ssn to save the keyid on tx path.
1924 sinfo->sinfo_tsn = 1;
1925 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1929 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1931 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1932 struct sctp_transport *transport = NULL;
1933 struct sctp_sndrcvinfo _sinfo, *sinfo;
1934 struct sctp_association *asoc, *tmp;
1935 struct sctp_cmsgs cmsgs;
1936 union sctp_addr *daddr;
1941 /* Parse and get snd_info */
1942 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1947 sflags = sinfo->sinfo_flags;
1949 /* Get daddr from msg */
1950 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1951 if (IS_ERR(daddr)) {
1952 err = PTR_ERR(daddr);
1958 /* SCTP_SENDALL process */
1959 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1960 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1961 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1968 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1970 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1975 iov_iter_revert(&msg->msg_iter, err);
1981 /* Get and check or create asoc */
1983 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1985 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1990 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1995 asoc = transport->asoc;
1999 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2002 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2008 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2013 /* Update snd_info with the asoc */
2014 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2016 /* Send msg to the asoc */
2017 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2018 if (err < 0 && err != -ESRCH && new)
2019 sctp_association_free(asoc);
2024 return sctp_error(sk, msg->msg_flags, err);
2027 /* This is an extended version of skb_pull() that removes the data from the
2028 * start of a skb even when data is spread across the list of skb's in the
2029 * frag_list. len specifies the total amount of data that needs to be removed.
2030 * when 'len' bytes could be removed from the skb, it returns 0.
2031 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2032 * could not be removed.
2034 static int sctp_skb_pull(struct sk_buff *skb, int len)
2036 struct sk_buff *list;
2037 int skb_len = skb_headlen(skb);
2040 if (len <= skb_len) {
2041 __skb_pull(skb, len);
2045 __skb_pull(skb, skb_len);
2047 skb_walk_frags(skb, list) {
2048 rlen = sctp_skb_pull(list, len);
2049 skb->len -= (len-rlen);
2050 skb->data_len -= (len-rlen);
2061 /* API 3.1.3 recvmsg() - UDP Style Syntax
2063 * ssize_t recvmsg(int socket, struct msghdr *message,
2066 * socket - the socket descriptor of the endpoint.
2067 * message - pointer to the msghdr structure which contains a single
2068 * user message and possibly some ancillary data.
2070 * See Section 5 for complete description of the data
2073 * flags - flags sent or received with the user message, see Section
2074 * 5 for complete description of the flags.
2076 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2077 int noblock, int flags, int *addr_len)
2079 struct sctp_ulpevent *event = NULL;
2080 struct sctp_sock *sp = sctp_sk(sk);
2081 struct sk_buff *skb, *head_skb;
2086 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2087 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2092 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2093 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2098 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2102 /* Get the total length of the skb including any skb's in the
2111 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2113 event = sctp_skb2event(skb);
2118 if (event->chunk && event->chunk->head_skb)
2119 head_skb = event->chunk->head_skb;
2122 sock_recv_ts_and_drops(msg, sk, head_skb);
2123 if (sctp_ulpevent_is_notification(event)) {
2124 msg->msg_flags |= MSG_NOTIFICATION;
2125 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2127 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2130 /* Check if we allow SCTP_NXTINFO. */
2131 if (sp->recvnxtinfo)
2132 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2133 /* Check if we allow SCTP_RCVINFO. */
2134 if (sp->recvrcvinfo)
2135 sctp_ulpevent_read_rcvinfo(event, msg);
2136 /* Check if we allow SCTP_SNDRCVINFO. */
2137 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2138 sctp_ulpevent_read_sndrcvinfo(event, msg);
2142 /* If skb's length exceeds the user's buffer, update the skb and
2143 * push it back to the receive_queue so that the next call to
2144 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2146 if (skb_len > copied) {
2147 msg->msg_flags &= ~MSG_EOR;
2148 if (flags & MSG_PEEK)
2150 sctp_skb_pull(skb, copied);
2151 skb_queue_head(&sk->sk_receive_queue, skb);
2153 /* When only partial message is copied to the user, increase
2154 * rwnd by that amount. If all the data in the skb is read,
2155 * rwnd is updated when the event is freed.
2157 if (!sctp_ulpevent_is_notification(event))
2158 sctp_assoc_rwnd_increase(event->asoc, copied);
2160 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2161 (event->msg_flags & MSG_EOR))
2162 msg->msg_flags |= MSG_EOR;
2164 msg->msg_flags &= ~MSG_EOR;
2167 if (flags & MSG_PEEK) {
2168 /* Release the skb reference acquired after peeking the skb in
2169 * sctp_skb_recv_datagram().
2173 /* Free the event which includes releasing the reference to
2174 * the owner of the skb, freeing the skb and updating the
2177 sctp_ulpevent_free(event);
2184 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2186 * This option is a on/off flag. If enabled no SCTP message
2187 * fragmentation will be performed. Instead if a message being sent
2188 * exceeds the current PMTU size, the message will NOT be sent and
2189 * instead a error will be indicated to the user.
2191 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2192 char __user *optval,
2193 unsigned int optlen)
2197 if (optlen < sizeof(int))
2200 if (get_user(val, (int __user *)optval))
2203 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2208 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2209 unsigned int optlen)
2211 struct sctp_event_subscribe subscribe;
2212 __u8 *sn_type = (__u8 *)&subscribe;
2213 struct sctp_sock *sp = sctp_sk(sk);
2214 struct sctp_association *asoc;
2217 if (optlen > sizeof(struct sctp_event_subscribe))
2220 if (copy_from_user(&subscribe, optval, optlen))
2223 for (i = 0; i < optlen; i++)
2224 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2227 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2228 asoc->subscribe = sctp_sk(sk)->subscribe;
2230 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2231 * if there is no data to be sent or retransmit, the stack will
2232 * immediately send up this notification.
2234 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2235 struct sctp_ulpevent *event;
2237 asoc = sctp_id2assoc(sk, 0);
2238 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2239 event = sctp_ulpevent_make_sender_dry_event(asoc,
2240 GFP_USER | __GFP_NOWARN);
2244 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2251 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2253 * This socket option is applicable to the UDP-style socket only. When
2254 * set it will cause associations that are idle for more than the
2255 * specified number of seconds to automatically close. An association
2256 * being idle is defined an association that has NOT sent or received
2257 * user data. The special value of '0' indicates that no automatic
2258 * close of any associations should be performed. The option expects an
2259 * integer defining the number of seconds of idle time before an
2260 * association is closed.
2262 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2263 unsigned int optlen)
2265 struct sctp_sock *sp = sctp_sk(sk);
2266 struct net *net = sock_net(sk);
2268 /* Applicable to UDP-style socket only */
2269 if (sctp_style(sk, TCP))
2271 if (optlen != sizeof(int))
2273 if (copy_from_user(&sp->autoclose, optval, optlen))
2276 if (sp->autoclose > net->sctp.max_autoclose)
2277 sp->autoclose = net->sctp.max_autoclose;
2282 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2284 * Applications can enable or disable heartbeats for any peer address of
2285 * an association, modify an address's heartbeat interval, force a
2286 * heartbeat to be sent immediately, and adjust the address's maximum
2287 * number of retransmissions sent before an address is considered
2288 * unreachable. The following structure is used to access and modify an
2289 * address's parameters:
2291 * struct sctp_paddrparams {
2292 * sctp_assoc_t spp_assoc_id;
2293 * struct sockaddr_storage spp_address;
2294 * uint32_t spp_hbinterval;
2295 * uint16_t spp_pathmaxrxt;
2296 * uint32_t spp_pathmtu;
2297 * uint32_t spp_sackdelay;
2298 * uint32_t spp_flags;
2299 * uint32_t spp_ipv6_flowlabel;
2303 * spp_assoc_id - (one-to-many style socket) This is filled in the
2304 * application, and identifies the association for
2306 * spp_address - This specifies which address is of interest.
2307 * spp_hbinterval - This contains the value of the heartbeat interval,
2308 * in milliseconds. If a value of zero
2309 * is present in this field then no changes are to
2310 * be made to this parameter.
2311 * spp_pathmaxrxt - This contains the maximum number of
2312 * retransmissions before this address shall be
2313 * considered unreachable. If a value of zero
2314 * is present in this field then no changes are to
2315 * be made to this parameter.
2316 * spp_pathmtu - When Path MTU discovery is disabled the value
2317 * specified here will be the "fixed" path mtu.
2318 * Note that if the spp_address field is empty
2319 * then all associations on this address will
2320 * have this fixed path mtu set upon them.
2322 * spp_sackdelay - When delayed sack is enabled, this value specifies
2323 * the number of milliseconds that sacks will be delayed
2324 * for. This value will apply to all addresses of an
2325 * association if the spp_address field is empty. Note
2326 * also, that if delayed sack is enabled and this
2327 * value is set to 0, no change is made to the last
2328 * recorded delayed sack timer value.
2330 * spp_flags - These flags are used to control various features
2331 * on an association. The flag field may contain
2332 * zero or more of the following options.
2334 * SPP_HB_ENABLE - Enable heartbeats on the
2335 * specified address. Note that if the address
2336 * field is empty all addresses for the association
2337 * have heartbeats enabled upon them.
2339 * SPP_HB_DISABLE - Disable heartbeats on the
2340 * speicifed address. Note that if the address
2341 * field is empty all addresses for the association
2342 * will have their heartbeats disabled. Note also
2343 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2344 * mutually exclusive, only one of these two should
2345 * be specified. Enabling both fields will have
2346 * undetermined results.
2348 * SPP_HB_DEMAND - Request a user initiated heartbeat
2349 * to be made immediately.
2351 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2352 * heartbeat delayis to be set to the value of 0
2355 * SPP_PMTUD_ENABLE - This field will enable PMTU
2356 * discovery upon the specified address. Note that
2357 * if the address feild is empty then all addresses
2358 * on the association are effected.
2360 * SPP_PMTUD_DISABLE - This field will disable PMTU
2361 * discovery upon the specified address. Note that
2362 * if the address feild is empty then all addresses
2363 * on the association are effected. Not also that
2364 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2365 * exclusive. Enabling both will have undetermined
2368 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2369 * on delayed sack. The time specified in spp_sackdelay
2370 * is used to specify the sack delay for this address. Note
2371 * that if spp_address is empty then all addresses will
2372 * enable delayed sack and take on the sack delay
2373 * value specified in spp_sackdelay.
2374 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2375 * off delayed sack. If the spp_address field is blank then
2376 * delayed sack is disabled for the entire association. Note
2377 * also that this field is mutually exclusive to
2378 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2381 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2382 * setting of the IPV6 flow label value. The value is
2383 * contained in the spp_ipv6_flowlabel field.
2384 * Upon retrieval, this flag will be set to indicate that
2385 * the spp_ipv6_flowlabel field has a valid value returned.
2386 * If a specific destination address is set (in the
2387 * spp_address field), then the value returned is that of
2388 * the address. If just an association is specified (and
2389 * no address), then the association's default flow label
2390 * is returned. If neither an association nor a destination
2391 * is specified, then the socket's default flow label is
2392 * returned. For non-IPv6 sockets, this flag will be left
2395 * SPP_DSCP: Setting this flag enables the setting of the
2396 * Differentiated Services Code Point (DSCP) value
2397 * associated with either the association or a specific
2398 * address. The value is obtained in the spp_dscp field.
2399 * Upon retrieval, this flag will be set to indicate that
2400 * the spp_dscp field has a valid value returned. If a
2401 * specific destination address is set when called (in the
2402 * spp_address field), then that specific destination
2403 * address's DSCP value is returned. If just an association
2404 * is specified, then the association's default DSCP is
2405 * returned. If neither an association nor a destination is
2406 * specified, then the socket's default DSCP is returned.
2408 * spp_ipv6_flowlabel
2409 * - This field is used in conjunction with the
2410 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2411 * The 20 least significant bits are used for the flow
2412 * label. This setting has precedence over any IPv6-layer
2415 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2416 * and contains the DSCP. The 6 most significant bits are
2417 * used for the DSCP. This setting has precedence over any
2418 * IPv4- or IPv6- layer setting.
2420 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2421 struct sctp_transport *trans,
2422 struct sctp_association *asoc,
2423 struct sctp_sock *sp,
2426 int sackdelay_change)
2430 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2431 struct net *net = sock_net(trans->asoc->base.sk);
2433 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2438 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2439 * this field is ignored. Note also that a value of zero indicates
2440 * the current setting should be left unchanged.
2442 if (params->spp_flags & SPP_HB_ENABLE) {
2444 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2445 * set. This lets us use 0 value when this flag
2448 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2449 params->spp_hbinterval = 0;
2451 if (params->spp_hbinterval ||
2452 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2455 msecs_to_jiffies(params->spp_hbinterval);
2458 msecs_to_jiffies(params->spp_hbinterval);
2460 sp->hbinterval = params->spp_hbinterval;
2467 trans->param_flags =
2468 (trans->param_flags & ~SPP_HB) | hb_change;
2471 (asoc->param_flags & ~SPP_HB) | hb_change;
2474 (sp->param_flags & ~SPP_HB) | hb_change;
2478 /* When Path MTU discovery is disabled the value specified here will
2479 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2480 * include the flag SPP_PMTUD_DISABLE for this field to have any
2483 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2485 trans->pathmtu = params->spp_pathmtu;
2486 sctp_assoc_sync_pmtu(asoc);
2488 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2490 sp->pathmtu = params->spp_pathmtu;
2496 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2497 (params->spp_flags & SPP_PMTUD_ENABLE);
2498 trans->param_flags =
2499 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2501 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2502 sctp_assoc_sync_pmtu(asoc);
2506 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2509 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2513 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2514 * value of this field is ignored. Note also that a value of zero
2515 * indicates the current setting should be left unchanged.
2517 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2520 msecs_to_jiffies(params->spp_sackdelay);
2523 msecs_to_jiffies(params->spp_sackdelay);
2525 sp->sackdelay = params->spp_sackdelay;
2529 if (sackdelay_change) {
2531 trans->param_flags =
2532 (trans->param_flags & ~SPP_SACKDELAY) |
2536 (asoc->param_flags & ~SPP_SACKDELAY) |
2540 (sp->param_flags & ~SPP_SACKDELAY) |
2545 /* Note that a value of zero indicates the current setting should be
2548 if (params->spp_pathmaxrxt) {
2550 trans->pathmaxrxt = params->spp_pathmaxrxt;
2552 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2554 sp->pathmaxrxt = params->spp_pathmaxrxt;
2558 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2560 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2561 trans->flowlabel = params->spp_ipv6_flowlabel &
2562 SCTP_FLOWLABEL_VAL_MASK;
2563 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2566 struct sctp_transport *t;
2568 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2570 if (t->ipaddr.sa.sa_family != AF_INET6)
2572 t->flowlabel = params->spp_ipv6_flowlabel &
2573 SCTP_FLOWLABEL_VAL_MASK;
2574 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2576 asoc->flowlabel = params->spp_ipv6_flowlabel &
2577 SCTP_FLOWLABEL_VAL_MASK;
2578 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2579 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2580 sp->flowlabel = params->spp_ipv6_flowlabel &
2581 SCTP_FLOWLABEL_VAL_MASK;
2582 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2586 if (params->spp_flags & SPP_DSCP) {
2588 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2589 trans->dscp |= SCTP_DSCP_SET_MASK;
2591 struct sctp_transport *t;
2593 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2595 t->dscp = params->spp_dscp &
2597 t->dscp |= SCTP_DSCP_SET_MASK;
2599 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2600 asoc->dscp |= SCTP_DSCP_SET_MASK;
2602 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2603 sp->dscp |= SCTP_DSCP_SET_MASK;
2610 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2611 char __user *optval,
2612 unsigned int optlen)
2614 struct sctp_paddrparams params;
2615 struct sctp_transport *trans = NULL;
2616 struct sctp_association *asoc = NULL;
2617 struct sctp_sock *sp = sctp_sk(sk);
2619 int hb_change, pmtud_change, sackdelay_change;
2621 if (optlen == sizeof(params)) {
2622 if (copy_from_user(¶ms, optval, optlen))
2624 } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2625 spp_ipv6_flowlabel), 4)) {
2626 if (copy_from_user(¶ms, optval, optlen))
2628 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2634 /* Validate flags and value parameters. */
2635 hb_change = params.spp_flags & SPP_HB;
2636 pmtud_change = params.spp_flags & SPP_PMTUD;
2637 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2639 if (hb_change == SPP_HB ||
2640 pmtud_change == SPP_PMTUD ||
2641 sackdelay_change == SPP_SACKDELAY ||
2642 params.spp_sackdelay > 500 ||
2643 (params.spp_pathmtu &&
2644 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2647 /* If an address other than INADDR_ANY is specified, and
2648 * no transport is found, then the request is invalid.
2650 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2651 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2652 params.spp_assoc_id);
2657 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2658 * socket is a one to many style socket, and an association
2659 * was not found, then the id was invalid.
2661 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2662 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2663 sctp_style(sk, UDP))
2666 /* Heartbeat demand can only be sent on a transport or
2667 * association, but not a socket.
2669 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2672 /* Process parameters. */
2673 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2674 hb_change, pmtud_change,
2680 /* If changes are for association, also apply parameters to each
2683 if (!trans && asoc) {
2684 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2686 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2687 hb_change, pmtud_change,
2695 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2697 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2700 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2702 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2705 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2706 struct sctp_association *asoc)
2708 struct sctp_transport *trans;
2710 if (params->sack_delay) {
2711 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2713 sctp_spp_sackdelay_enable(asoc->param_flags);
2715 if (params->sack_freq == 1) {
2717 sctp_spp_sackdelay_disable(asoc->param_flags);
2718 } else if (params->sack_freq > 1) {
2719 asoc->sackfreq = params->sack_freq;
2721 sctp_spp_sackdelay_enable(asoc->param_flags);
2724 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2726 if (params->sack_delay) {
2727 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2728 trans->param_flags =
2729 sctp_spp_sackdelay_enable(trans->param_flags);
2731 if (params->sack_freq == 1) {
2732 trans->param_flags =
2733 sctp_spp_sackdelay_disable(trans->param_flags);
2734 } else if (params->sack_freq > 1) {
2735 trans->sackfreq = params->sack_freq;
2736 trans->param_flags =
2737 sctp_spp_sackdelay_enable(trans->param_flags);
2743 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2745 * This option will effect the way delayed acks are performed. This
2746 * option allows you to get or set the delayed ack time, in
2747 * milliseconds. It also allows changing the delayed ack frequency.
2748 * Changing the frequency to 1 disables the delayed sack algorithm. If
2749 * the assoc_id is 0, then this sets or gets the endpoints default
2750 * values. If the assoc_id field is non-zero, then the set or get
2751 * effects the specified association for the one to many model (the
2752 * assoc_id field is ignored by the one to one model). Note that if
2753 * sack_delay or sack_freq are 0 when setting this option, then the
2754 * current values will remain unchanged.
2756 * struct sctp_sack_info {
2757 * sctp_assoc_t sack_assoc_id;
2758 * uint32_t sack_delay;
2759 * uint32_t sack_freq;
2762 * sack_assoc_id - This parameter, indicates which association the user
2763 * is performing an action upon. Note that if this field's value is
2764 * zero then the endpoints default value is changed (effecting future
2765 * associations only).
2767 * sack_delay - This parameter contains the number of milliseconds that
2768 * the user is requesting the delayed ACK timer be set to. Note that
2769 * this value is defined in the standard to be between 200 and 500
2772 * sack_freq - This parameter contains the number of packets that must
2773 * be received before a sack is sent without waiting for the delay
2774 * timer to expire. The default value for this is 2, setting this
2775 * value to 1 will disable the delayed sack algorithm.
2778 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2779 char __user *optval, unsigned int optlen)
2781 struct sctp_sock *sp = sctp_sk(sk);
2782 struct sctp_association *asoc;
2783 struct sctp_sack_info params;
2785 if (optlen == sizeof(struct sctp_sack_info)) {
2786 if (copy_from_user(¶ms, optval, optlen))
2789 if (params.sack_delay == 0 && params.sack_freq == 0)
2791 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2792 pr_warn_ratelimited(DEPRECATED
2794 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2795 "Use struct sctp_sack_info instead\n",
2796 current->comm, task_pid_nr(current));
2797 if (copy_from_user(¶ms, optval, optlen))
2800 if (params.sack_delay == 0)
2801 params.sack_freq = 1;
2803 params.sack_freq = 0;
2807 /* Validate value parameter. */
2808 if (params.sack_delay > 500)
2811 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2812 * socket is a one to many style socket, and an association
2813 * was not found, then the id was invalid.
2815 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2816 if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2817 sctp_style(sk, UDP))
2821 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2826 if (sctp_style(sk, TCP))
2827 params.sack_assoc_id = SCTP_FUTURE_ASSOC;
2829 if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2830 params.sack_assoc_id == SCTP_ALL_ASSOC) {
2831 if (params.sack_delay) {
2832 sp->sackdelay = params.sack_delay;
2834 sctp_spp_sackdelay_enable(sp->param_flags);
2836 if (params.sack_freq == 1) {
2838 sctp_spp_sackdelay_disable(sp->param_flags);
2839 } else if (params.sack_freq > 1) {
2840 sp->sackfreq = params.sack_freq;
2842 sctp_spp_sackdelay_enable(sp->param_flags);
2846 if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2847 params.sack_assoc_id == SCTP_ALL_ASSOC)
2848 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2849 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2854 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2856 * Applications can specify protocol parameters for the default association
2857 * initialization. The option name argument to setsockopt() and getsockopt()
2860 * Setting initialization parameters is effective only on an unconnected
2861 * socket (for UDP-style sockets only future associations are effected
2862 * by the change). With TCP-style sockets, this option is inherited by
2863 * sockets derived from a listener socket.
2865 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2867 struct sctp_initmsg sinit;
2868 struct sctp_sock *sp = sctp_sk(sk);
2870 if (optlen != sizeof(struct sctp_initmsg))
2872 if (copy_from_user(&sinit, optval, optlen))
2875 if (sinit.sinit_num_ostreams)
2876 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2877 if (sinit.sinit_max_instreams)
2878 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2879 if (sinit.sinit_max_attempts)
2880 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2881 if (sinit.sinit_max_init_timeo)
2882 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2888 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2890 * Applications that wish to use the sendto() system call may wish to
2891 * specify a default set of parameters that would normally be supplied
2892 * through the inclusion of ancillary data. This socket option allows
2893 * such an application to set the default sctp_sndrcvinfo structure.
2894 * The application that wishes to use this socket option simply passes
2895 * in to this call the sctp_sndrcvinfo structure defined in Section
2896 * 5.2.2) The input parameters accepted by this call include
2897 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2898 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2899 * to this call if the caller is using the UDP model.
2901 static int sctp_setsockopt_default_send_param(struct sock *sk,
2902 char __user *optval,
2903 unsigned int optlen)
2905 struct sctp_sock *sp = sctp_sk(sk);
2906 struct sctp_association *asoc;
2907 struct sctp_sndrcvinfo info;
2909 if (optlen != sizeof(info))
2911 if (copy_from_user(&info, optval, optlen))
2913 if (info.sinfo_flags &
2914 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2915 SCTP_ABORT | SCTP_EOF))
2918 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2919 if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
2920 sctp_style(sk, UDP))
2924 asoc->default_stream = info.sinfo_stream;
2925 asoc->default_flags = info.sinfo_flags;
2926 asoc->default_ppid = info.sinfo_ppid;
2927 asoc->default_context = info.sinfo_context;
2928 asoc->default_timetolive = info.sinfo_timetolive;
2933 if (sctp_style(sk, TCP))
2934 info.sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2936 if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2937 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2938 sp->default_stream = info.sinfo_stream;
2939 sp->default_flags = info.sinfo_flags;
2940 sp->default_ppid = info.sinfo_ppid;
2941 sp->default_context = info.sinfo_context;
2942 sp->default_timetolive = info.sinfo_timetolive;
2945 if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2946 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
2947 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2948 asoc->default_stream = info.sinfo_stream;
2949 asoc->default_flags = info.sinfo_flags;
2950 asoc->default_ppid = info.sinfo_ppid;
2951 asoc->default_context = info.sinfo_context;
2952 asoc->default_timetolive = info.sinfo_timetolive;
2959 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2960 * (SCTP_DEFAULT_SNDINFO)
2962 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2963 char __user *optval,
2964 unsigned int optlen)
2966 struct sctp_sock *sp = sctp_sk(sk);
2967 struct sctp_association *asoc;
2968 struct sctp_sndinfo info;
2970 if (optlen != sizeof(info))
2972 if (copy_from_user(&info, optval, optlen))
2974 if (info.snd_flags &
2975 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2976 SCTP_ABORT | SCTP_EOF))
2979 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2980 if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
2981 sctp_style(sk, UDP))
2985 asoc->default_stream = info.snd_sid;
2986 asoc->default_flags = info.snd_flags;
2987 asoc->default_ppid = info.snd_ppid;
2988 asoc->default_context = info.snd_context;
2993 if (sctp_style(sk, TCP))
2994 info.snd_assoc_id = SCTP_FUTURE_ASSOC;
2996 if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
2997 info.snd_assoc_id == SCTP_ALL_ASSOC) {
2998 sp->default_stream = info.snd_sid;
2999 sp->default_flags = info.snd_flags;
3000 sp->default_ppid = info.snd_ppid;
3001 sp->default_context = info.snd_context;
3004 if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3005 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3006 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3007 asoc->default_stream = info.snd_sid;
3008 asoc->default_flags = info.snd_flags;
3009 asoc->default_ppid = info.snd_ppid;
3010 asoc->default_context = info.snd_context;
3017 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3019 * Requests that the local SCTP stack use the enclosed peer address as
3020 * the association primary. The enclosed address must be one of the
3021 * association peer's addresses.
3023 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3024 unsigned int optlen)
3026 struct sctp_prim prim;
3027 struct sctp_transport *trans;
3031 if (optlen != sizeof(struct sctp_prim))
3034 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3037 /* Allow security module to validate address but need address len. */
3038 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3042 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3043 (struct sockaddr *)&prim.ssp_addr,
3048 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3052 sctp_assoc_set_primary(trans->asoc, trans);
3058 * 7.1.5 SCTP_NODELAY
3060 * Turn on/off any Nagle-like algorithm. This means that packets are
3061 * generally sent as soon as possible and no unnecessary delays are
3062 * introduced, at the cost of more packets in the network. Expects an
3063 * integer boolean flag.
3065 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3066 unsigned int optlen)
3070 if (optlen < sizeof(int))
3072 if (get_user(val, (int __user *)optval))
3075 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3081 * 7.1.1 SCTP_RTOINFO
3083 * The protocol parameters used to initialize and bound retransmission
3084 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3085 * and modify these parameters.
3086 * All parameters are time values, in milliseconds. A value of 0, when
3087 * modifying the parameters, indicates that the current value should not
3091 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3093 struct sctp_rtoinfo rtoinfo;
3094 struct sctp_association *asoc;
3095 unsigned long rto_min, rto_max;
3096 struct sctp_sock *sp = sctp_sk(sk);
3098 if (optlen != sizeof (struct sctp_rtoinfo))
3101 if (copy_from_user(&rtoinfo, optval, optlen))
3104 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3106 /* Set the values to the specific association */
3107 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3108 sctp_style(sk, UDP))
3111 rto_max = rtoinfo.srto_max;
3112 rto_min = rtoinfo.srto_min;
3115 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3117 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3120 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3122 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3124 if (rto_min > rto_max)
3128 if (rtoinfo.srto_initial != 0)
3130 msecs_to_jiffies(rtoinfo.srto_initial);
3131 asoc->rto_max = rto_max;
3132 asoc->rto_min = rto_min;
3134 /* If there is no association or the association-id = 0
3135 * set the values to the endpoint.
3137 if (rtoinfo.srto_initial != 0)
3138 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3139 sp->rtoinfo.srto_max = rto_max;
3140 sp->rtoinfo.srto_min = rto_min;
3148 * 7.1.2 SCTP_ASSOCINFO
3150 * This option is used to tune the maximum retransmission attempts
3151 * of the association.
3152 * Returns an error if the new association retransmission value is
3153 * greater than the sum of the retransmission value of the peer.
3154 * See [SCTP] for more information.
3157 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3160 struct sctp_assocparams assocparams;
3161 struct sctp_association *asoc;
3163 if (optlen != sizeof(struct sctp_assocparams))
3165 if (copy_from_user(&assocparams, optval, optlen))
3168 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3170 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3171 sctp_style(sk, UDP))
3174 /* Set the values to the specific association */
3176 if (assocparams.sasoc_asocmaxrxt != 0) {
3179 struct sctp_transport *peer_addr;
3181 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3183 path_sum += peer_addr->pathmaxrxt;
3187 /* Only validate asocmaxrxt if we have more than
3188 * one path/transport. We do this because path
3189 * retransmissions are only counted when we have more
3193 assocparams.sasoc_asocmaxrxt > path_sum)
3196 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3199 if (assocparams.sasoc_cookie_life != 0)
3200 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3202 /* Set the values to the endpoint */
3203 struct sctp_sock *sp = sctp_sk(sk);
3205 if (assocparams.sasoc_asocmaxrxt != 0)
3206 sp->assocparams.sasoc_asocmaxrxt =
3207 assocparams.sasoc_asocmaxrxt;
3208 if (assocparams.sasoc_cookie_life != 0)
3209 sp->assocparams.sasoc_cookie_life =
3210 assocparams.sasoc_cookie_life;
3216 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3218 * This socket option is a boolean flag which turns on or off mapped V4
3219 * addresses. If this option is turned on and the socket is type
3220 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3221 * If this option is turned off, then no mapping will be done of V4
3222 * addresses and a user will receive both PF_INET6 and PF_INET type
3223 * addresses on the socket.
3225 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3228 struct sctp_sock *sp = sctp_sk(sk);
3230 if (optlen < sizeof(int))
3232 if (get_user(val, (int __user *)optval))
3243 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3244 * This option will get or set the maximum size to put in any outgoing
3245 * SCTP DATA chunk. If a message is larger than this size it will be
3246 * fragmented by SCTP into the specified size. Note that the underlying
3247 * SCTP implementation may fragment into smaller sized chunks when the
3248 * PMTU of the underlying association is smaller than the value set by
3249 * the user. The default value for this option is '0' which indicates
3250 * the user is NOT limiting fragmentation and only the PMTU will effect
3251 * SCTP's choice of DATA chunk size. Note also that values set larger
3252 * than the maximum size of an IP datagram will effectively let SCTP
3253 * control fragmentation (i.e. the same as setting this option to 0).
3255 * The following structure is used to access and modify this parameter:
3257 * struct sctp_assoc_value {
3258 * sctp_assoc_t assoc_id;
3259 * uint32_t assoc_value;
3262 * assoc_id: This parameter is ignored for one-to-one style sockets.
3263 * For one-to-many style sockets this parameter indicates which
3264 * association the user is performing an action upon. Note that if
3265 * this field's value is zero then the endpoints default value is
3266 * changed (effecting future associations only).
3267 * assoc_value: This parameter specifies the maximum size in bytes.
3269 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3271 struct sctp_sock *sp = sctp_sk(sk);
3272 struct sctp_assoc_value params;
3273 struct sctp_association *asoc;
3276 if (optlen == sizeof(int)) {
3277 pr_warn_ratelimited(DEPRECATED
3279 "Use of int in maxseg socket option.\n"
3280 "Use struct sctp_assoc_value instead\n",
3281 current->comm, task_pid_nr(current));
3282 if (copy_from_user(&val, optval, optlen))
3284 params.assoc_id = SCTP_FUTURE_ASSOC;
3285 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3286 if (copy_from_user(¶ms, optval, optlen))
3288 val = params.assoc_value;
3293 asoc = sctp_id2assoc(sk, params.assoc_id);
3294 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3295 sctp_style(sk, UDP))
3299 int min_len, max_len;
3300 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3301 sizeof(struct sctp_data_chunk);
3303 min_len = sctp_min_frag_point(sp, datasize);
3304 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3306 if (val < min_len || val > max_len)
3311 asoc->user_frag = val;
3312 sctp_assoc_update_frag_point(asoc);
3314 sp->user_frag = val;
3322 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3324 * Requests that the peer mark the enclosed address as the association
3325 * primary. The enclosed address must be one of the association's
3326 * locally bound addresses. The following structure is used to make a
3327 * set primary request:
3329 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3330 unsigned int optlen)
3332 struct sctp_sock *sp;
3333 struct sctp_association *asoc = NULL;
3334 struct sctp_setpeerprim prim;
3335 struct sctp_chunk *chunk;
3341 if (!sp->ep->asconf_enable)
3344 if (optlen != sizeof(struct sctp_setpeerprim))
3347 if (copy_from_user(&prim, optval, optlen))
3350 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3354 if (!asoc->peer.asconf_capable)
3357 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3360 if (!sctp_state(asoc, ESTABLISHED))
3363 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3367 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3368 return -EADDRNOTAVAIL;
3370 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3371 return -EADDRNOTAVAIL;
3373 /* Allow security module to validate address. */
3374 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3375 (struct sockaddr *)&prim.sspp_addr,
3380 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3381 chunk = sctp_make_asconf_set_prim(asoc,
3382 (union sctp_addr *)&prim.sspp_addr);
3386 err = sctp_send_asconf(asoc, chunk);
3388 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3393 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3394 unsigned int optlen)
3396 struct sctp_setadaptation adaptation;
3398 if (optlen != sizeof(struct sctp_setadaptation))
3400 if (copy_from_user(&adaptation, optval, optlen))
3403 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3409 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3411 * The context field in the sctp_sndrcvinfo structure is normally only
3412 * used when a failed message is retrieved holding the value that was
3413 * sent down on the actual send call. This option allows the setting of
3414 * a default context on an association basis that will be received on
3415 * reading messages from the peer. This is especially helpful in the
3416 * one-2-many model for an application to keep some reference to an
3417 * internal state machine that is processing messages on the
3418 * association. Note that the setting of this value only effects
3419 * received messages from the peer and does not effect the value that is
3420 * saved with outbound messages.
3422 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3423 unsigned int optlen)
3425 struct sctp_sock *sp = sctp_sk(sk);
3426 struct sctp_assoc_value params;
3427 struct sctp_association *asoc;
3429 if (optlen != sizeof(struct sctp_assoc_value))
3431 if (copy_from_user(¶ms, optval, optlen))
3434 asoc = sctp_id2assoc(sk, params.assoc_id);
3435 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3436 sctp_style(sk, UDP))
3440 asoc->default_rcv_context = params.assoc_value;
3445 if (sctp_style(sk, TCP))
3446 params.assoc_id = SCTP_FUTURE_ASSOC;
3448 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3449 params.assoc_id == SCTP_ALL_ASSOC)
3450 sp->default_rcv_context = params.assoc_value;
3452 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3453 params.assoc_id == SCTP_ALL_ASSOC)
3454 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3455 asoc->default_rcv_context = params.assoc_value;
3461 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3463 * This options will at a minimum specify if the implementation is doing
3464 * fragmented interleave. Fragmented interleave, for a one to many
3465 * socket, is when subsequent calls to receive a message may return
3466 * parts of messages from different associations. Some implementations
3467 * may allow you to turn this value on or off. If so, when turned off,
3468 * no fragment interleave will occur (which will cause a head of line
3469 * blocking amongst multiple associations sharing the same one to many
3470 * socket). When this option is turned on, then each receive call may
3471 * come from a different association (thus the user must receive data
3472 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3473 * association each receive belongs to.
3475 * This option takes a boolean value. A non-zero value indicates that
3476 * fragmented interleave is on. A value of zero indicates that
3477 * fragmented interleave is off.
3479 * Note that it is important that an implementation that allows this
3480 * option to be turned on, have it off by default. Otherwise an unaware
3481 * application using the one to many model may become confused and act
3484 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3485 char __user *optval,
3486 unsigned int optlen)
3490 if (optlen != sizeof(int))
3492 if (get_user(val, (int __user *)optval))
3495 sctp_sk(sk)->frag_interleave = !!val;
3497 if (!sctp_sk(sk)->frag_interleave)
3498 sctp_sk(sk)->ep->intl_enable = 0;
3504 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3505 * (SCTP_PARTIAL_DELIVERY_POINT)
3507 * This option will set or get the SCTP partial delivery point. This
3508 * point is the size of a message where the partial delivery API will be
3509 * invoked to help free up rwnd space for the peer. Setting this to a
3510 * lower value will cause partial deliveries to happen more often. The
3511 * calls argument is an integer that sets or gets the partial delivery
3512 * point. Note also that the call will fail if the user attempts to set
3513 * this value larger than the socket receive buffer size.
3515 * Note that any single message having a length smaller than or equal to
3516 * the SCTP partial delivery point will be delivered in one single read
3517 * call as long as the user provided buffer is large enough to hold the
3520 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3521 char __user *optval,
3522 unsigned int optlen)
3526 if (optlen != sizeof(u32))
3528 if (get_user(val, (int __user *)optval))
3531 /* Note: We double the receive buffer from what the user sets
3532 * it to be, also initial rwnd is based on rcvbuf/2.
3534 if (val > (sk->sk_rcvbuf >> 1))
3537 sctp_sk(sk)->pd_point = val;
3539 return 0; /* is this the right error code? */
3543 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3545 * This option will allow a user to change the maximum burst of packets
3546 * that can be emitted by this association. Note that the default value
3547 * is 4, and some implementations may restrict this setting so that it
3548 * can only be lowered.
3550 * NOTE: This text doesn't seem right. Do this on a socket basis with
3551 * future associations inheriting the socket value.
3553 static int sctp_setsockopt_maxburst(struct sock *sk,
3554 char __user *optval,
3555 unsigned int optlen)
3557 struct sctp_sock *sp = sctp_sk(sk);
3558 struct sctp_assoc_value params;
3559 struct sctp_association *asoc;
3561 if (optlen == sizeof(int)) {
3562 pr_warn_ratelimited(DEPRECATED
3564 "Use of int in max_burst socket option deprecated.\n"
3565 "Use struct sctp_assoc_value instead\n",
3566 current->comm, task_pid_nr(current));
3567 if (copy_from_user(¶ms.assoc_value, optval, optlen))
3569 params.assoc_id = SCTP_FUTURE_ASSOC;
3570 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3571 if (copy_from_user(¶ms, optval, optlen))
3576 asoc = sctp_id2assoc(sk, params.assoc_id);
3577 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3578 sctp_style(sk, UDP))
3582 asoc->max_burst = params.assoc_value;
3587 if (sctp_style(sk, TCP))
3588 params.assoc_id = SCTP_FUTURE_ASSOC;
3590 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3591 params.assoc_id == SCTP_ALL_ASSOC)
3592 sp->max_burst = params.assoc_value;
3594 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3595 params.assoc_id == SCTP_ALL_ASSOC)
3596 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3597 asoc->max_burst = params.assoc_value;
3603 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3605 * This set option adds a chunk type that the user is requesting to be
3606 * received only in an authenticated way. Changes to the list of chunks
3607 * will only effect future associations on the socket.
3609 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3610 char __user *optval,
3611 unsigned int optlen)
3613 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3614 struct sctp_authchunk val;
3616 if (!ep->auth_enable)
3619 if (optlen != sizeof(struct sctp_authchunk))
3621 if (copy_from_user(&val, optval, optlen))
3624 switch (val.sauth_chunk) {
3626 case SCTP_CID_INIT_ACK:
3627 case SCTP_CID_SHUTDOWN_COMPLETE:
3632 /* add this chunk id to the endpoint */
3633 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3637 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3639 * This option gets or sets the list of HMAC algorithms that the local
3640 * endpoint requires the peer to use.
3642 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3643 char __user *optval,
3644 unsigned int optlen)
3646 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3647 struct sctp_hmacalgo *hmacs;
3651 if (!ep->auth_enable)
3654 if (optlen < sizeof(struct sctp_hmacalgo))
3656 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3657 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3659 hmacs = memdup_user(optval, optlen);
3661 return PTR_ERR(hmacs);
3663 idents = hmacs->shmac_num_idents;
3664 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3665 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3670 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3677 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3679 * This option will set a shared secret key which is used to build an
3680 * association shared key.
3682 static int sctp_setsockopt_auth_key(struct sock *sk,
3683 char __user *optval,
3684 unsigned int optlen)
3686 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3687 struct sctp_authkey *authkey;
3688 struct sctp_association *asoc;
3691 if (optlen <= sizeof(struct sctp_authkey))
3693 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3696 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3698 authkey = memdup_user(optval, optlen);
3699 if (IS_ERR(authkey))
3700 return PTR_ERR(authkey);
3702 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3705 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3706 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3707 sctp_style(sk, UDP))
3711 ret = sctp_auth_set_key(ep, asoc, authkey);
3715 if (sctp_style(sk, TCP))
3716 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3718 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3719 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3720 ret = sctp_auth_set_key(ep, asoc, authkey);
3727 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3728 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3729 list_for_each_entry(asoc, &ep->asocs, asocs) {
3730 int res = sctp_auth_set_key(ep, asoc, authkey);
3743 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3745 * This option will get or set the active shared key to be used to build
3746 * the association shared key.
3748 static int sctp_setsockopt_active_key(struct sock *sk,
3749 char __user *optval,
3750 unsigned int optlen)
3752 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3753 struct sctp_association *asoc;
3754 struct sctp_authkeyid val;
3757 if (optlen != sizeof(struct sctp_authkeyid))
3759 if (copy_from_user(&val, optval, optlen))
3762 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3763 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3764 sctp_style(sk, UDP))
3768 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3770 if (sctp_style(sk, TCP))
3771 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3773 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3774 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3775 ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3780 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3781 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3782 list_for_each_entry(asoc, &ep->asocs, asocs) {
3783 int res = sctp_auth_set_active_key(ep, asoc,
3784 val.scact_keynumber);
3795 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3797 * This set option will delete a shared secret key from use.
3799 static int sctp_setsockopt_del_key(struct sock *sk,
3800 char __user *optval,
3801 unsigned int optlen)
3803 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3804 struct sctp_association *asoc;
3805 struct sctp_authkeyid val;
3808 if (optlen != sizeof(struct sctp_authkeyid))
3810 if (copy_from_user(&val, optval, optlen))
3813 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3814 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3815 sctp_style(sk, UDP))
3819 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3821 if (sctp_style(sk, TCP))
3822 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3824 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3825 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3826 ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3831 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3832 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3833 list_for_each_entry(asoc, &ep->asocs, asocs) {
3834 int res = sctp_auth_del_key_id(ep, asoc,
3835 val.scact_keynumber);
3846 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3848 * This set option will deactivate a shared secret key.
3850 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3851 unsigned int optlen)
3853 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3854 struct sctp_association *asoc;
3855 struct sctp_authkeyid val;
3858 if (optlen != sizeof(struct sctp_authkeyid))
3860 if (copy_from_user(&val, optval, optlen))
3863 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3864 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3865 sctp_style(sk, UDP))
3869 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3871 if (sctp_style(sk, TCP))
3872 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3874 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3875 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3876 ret = sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3881 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3882 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3883 list_for_each_entry(asoc, &ep->asocs, asocs) {
3884 int res = sctp_auth_deact_key_id(ep, asoc,
3885 val.scact_keynumber);
3896 * 8.1.23 SCTP_AUTO_ASCONF
3898 * This option will enable or disable the use of the automatic generation of
3899 * ASCONF chunks to add and delete addresses to an existing association. Note
3900 * that this option has two caveats namely: a) it only affects sockets that
3901 * are bound to all addresses available to the SCTP stack, and b) the system
3902 * administrator may have an overriding control that turns the ASCONF feature
3903 * off no matter what setting the socket option may have.
3904 * This option expects an integer boolean flag, where a non-zero value turns on
3905 * the option, and a zero value turns off the option.
3906 * Note. In this implementation, socket operation overrides default parameter
3907 * being set by sysctl as well as FreeBSD implementation
3909 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3910 unsigned int optlen)
3913 struct sctp_sock *sp = sctp_sk(sk);
3915 if (optlen < sizeof(int))
3917 if (get_user(val, (int __user *)optval))
3919 if (!sctp_is_ep_boundall(sk) && val)
3921 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3924 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3925 if (val == 0 && sp->do_auto_asconf) {
3926 list_del(&sp->auto_asconf_list);
3927 sp->do_auto_asconf = 0;
3928 } else if (val && !sp->do_auto_asconf) {
3929 list_add_tail(&sp->auto_asconf_list,
3930 &sock_net(sk)->sctp.auto_asconf_splist);
3931 sp->do_auto_asconf = 1;
3933 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3938 * SCTP_PEER_ADDR_THLDS
3940 * This option allows us to alter the partially failed threshold for one or all
3941 * transports in an association. See Section 6.1 of:
3942 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3944 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3945 char __user *optval,
3946 unsigned int optlen)
3948 struct sctp_paddrthlds val;
3949 struct sctp_transport *trans;
3950 struct sctp_association *asoc;
3952 if (optlen < sizeof(struct sctp_paddrthlds))
3954 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3955 sizeof(struct sctp_paddrthlds)))
3958 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3959 trans = sctp_addr_id2transport(sk, &val.spt_address,
3964 if (val.spt_pathmaxrxt)
3965 trans->pathmaxrxt = val.spt_pathmaxrxt;
3966 trans->pf_retrans = val.spt_pathpfthld;
3971 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3972 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
3973 sctp_style(sk, UDP))
3977 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3979 if (val.spt_pathmaxrxt)
3980 trans->pathmaxrxt = val.spt_pathmaxrxt;
3981 trans->pf_retrans = val.spt_pathpfthld;
3984 if (val.spt_pathmaxrxt)
3985 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3986 asoc->pf_retrans = val.spt_pathpfthld;
3988 struct sctp_sock *sp = sctp_sk(sk);
3990 if (val.spt_pathmaxrxt)
3991 sp->pathmaxrxt = val.spt_pathmaxrxt;
3992 sp->pf_retrans = val.spt_pathpfthld;
3998 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3999 char __user *optval,
4000 unsigned int optlen)
4004 if (optlen < sizeof(int))
4006 if (get_user(val, (int __user *) optval))
4009 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4014 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4015 char __user *optval,
4016 unsigned int optlen)
4020 if (optlen < sizeof(int))
4022 if (get_user(val, (int __user *) optval))
4025 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4030 static int sctp_setsockopt_pr_supported(struct sock *sk,
4031 char __user *optval,
4032 unsigned int optlen)
4034 struct sctp_assoc_value params;
4035 struct sctp_association *asoc;
4037 if (optlen != sizeof(params))
4040 if (copy_from_user(¶ms, optval, optlen))
4043 asoc = sctp_id2assoc(sk, params.assoc_id);
4044 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4045 sctp_style(sk, UDP))
4048 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4053 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4054 char __user *optval,
4055 unsigned int optlen)
4057 struct sctp_sock *sp = sctp_sk(sk);
4058 struct sctp_default_prinfo info;
4059 struct sctp_association *asoc;
4060 int retval = -EINVAL;
4062 if (optlen != sizeof(info))
4065 if (copy_from_user(&info, optval, sizeof(info))) {
4070 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4073 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4076 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4077 if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4078 sctp_style(sk, UDP))
4084 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4085 asoc->default_timetolive = info.pr_value;
4089 if (sctp_style(sk, TCP))
4090 info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4092 if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4093 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4094 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4095 sp->default_timetolive = info.pr_value;
4098 if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4099 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4100 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4101 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4102 asoc->default_timetolive = info.pr_value;
4110 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4111 char __user *optval,
4112 unsigned int optlen)
4114 struct sctp_assoc_value params;
4115 struct sctp_association *asoc;
4116 int retval = -EINVAL;
4118 if (optlen != sizeof(params))
4121 if (copy_from_user(¶ms, optval, optlen)) {
4126 asoc = sctp_id2assoc(sk, params.assoc_id);
4127 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4128 sctp_style(sk, UDP))
4131 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4139 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4140 char __user *optval,
4141 unsigned int optlen)
4143 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4144 struct sctp_assoc_value params;
4145 struct sctp_association *asoc;
4146 int retval = -EINVAL;
4148 if (optlen != sizeof(params))
4151 if (copy_from_user(¶ms, optval, optlen)) {
4156 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4159 asoc = sctp_id2assoc(sk, params.assoc_id);
4160 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4161 sctp_style(sk, UDP))
4167 asoc->strreset_enable = params.assoc_value;
4171 if (sctp_style(sk, TCP))
4172 params.assoc_id = SCTP_FUTURE_ASSOC;
4174 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4175 params.assoc_id == SCTP_ALL_ASSOC)
4176 ep->strreset_enable = params.assoc_value;
4178 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4179 params.assoc_id == SCTP_ALL_ASSOC)
4180 list_for_each_entry(asoc, &ep->asocs, asocs)
4181 asoc->strreset_enable = params.assoc_value;
4187 static int sctp_setsockopt_reset_streams(struct sock *sk,
4188 char __user *optval,
4189 unsigned int optlen)
4191 struct sctp_reset_streams *params;
4192 struct sctp_association *asoc;
4193 int retval = -EINVAL;
4195 if (optlen < sizeof(*params))
4197 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4198 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4199 sizeof(__u16) * sizeof(*params));
4201 params = memdup_user(optval, optlen);
4203 return PTR_ERR(params);
4205 if (params->srs_number_streams * sizeof(__u16) >
4206 optlen - sizeof(*params))
4209 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4213 retval = sctp_send_reset_streams(asoc, params);
4220 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4221 char __user *optval,
4222 unsigned int optlen)
4224 struct sctp_association *asoc;
4225 sctp_assoc_t associd;
4226 int retval = -EINVAL;
4228 if (optlen != sizeof(associd))
4231 if (copy_from_user(&associd, optval, optlen)) {
4236 asoc = sctp_id2assoc(sk, associd);
4240 retval = sctp_send_reset_assoc(asoc);
4246 static int sctp_setsockopt_add_streams(struct sock *sk,
4247 char __user *optval,
4248 unsigned int optlen)
4250 struct sctp_association *asoc;
4251 struct sctp_add_streams params;
4252 int retval = -EINVAL;
4254 if (optlen != sizeof(params))
4257 if (copy_from_user(¶ms, optval, optlen)) {
4262 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4266 retval = sctp_send_add_streams(asoc, ¶ms);
4272 static int sctp_setsockopt_scheduler(struct sock *sk,
4273 char __user *optval,
4274 unsigned int optlen)
4276 struct sctp_sock *sp = sctp_sk(sk);
4277 struct sctp_association *asoc;
4278 struct sctp_assoc_value params;
4281 if (optlen < sizeof(params))
4284 optlen = sizeof(params);
4285 if (copy_from_user(¶ms, optval, optlen))
4288 if (params.assoc_value > SCTP_SS_MAX)
4291 asoc = sctp_id2assoc(sk, params.assoc_id);
4292 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4293 sctp_style(sk, UDP))
4297 return sctp_sched_set_sched(asoc, params.assoc_value);
4299 if (sctp_style(sk, TCP))
4300 params.assoc_id = SCTP_FUTURE_ASSOC;
4302 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4303 params.assoc_id == SCTP_ALL_ASSOC)
4304 sp->default_ss = params.assoc_value;
4306 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4307 params.assoc_id == SCTP_ALL_ASSOC) {
4308 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4309 int ret = sctp_sched_set_sched(asoc,
4310 params.assoc_value);
4320 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4321 char __user *optval,
4322 unsigned int optlen)
4324 struct sctp_stream_value params;
4325 struct sctp_association *asoc;
4326 int retval = -EINVAL;
4328 if (optlen < sizeof(params))
4331 optlen = sizeof(params);
4332 if (copy_from_user(¶ms, optval, optlen)) {
4337 asoc = sctp_id2assoc(sk, params.assoc_id);
4338 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4339 sctp_style(sk, UDP))
4343 retval = sctp_sched_set_value(asoc, params.stream_id,
4344 params.stream_value, GFP_KERNEL);
4350 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4351 int ret = sctp_sched_set_value(asoc, params.stream_id,
4352 params.stream_value, GFP_KERNEL);
4353 if (ret && !retval) /* try to return the 1st error. */
4361 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4362 char __user *optval,
4363 unsigned int optlen)
4365 struct sctp_sock *sp = sctp_sk(sk);
4366 struct sctp_assoc_value params;
4367 struct sctp_association *asoc;
4368 int retval = -EINVAL;
4370 if (optlen < sizeof(params))
4373 optlen = sizeof(params);
4374 if (copy_from_user(¶ms, optval, optlen)) {
4379 asoc = sctp_id2assoc(sk, params.assoc_id);
4380 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4381 sctp_style(sk, UDP))
4384 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4389 sp->ep->intl_enable = !!params.assoc_value;
4397 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4398 unsigned int optlen)
4402 if (!sctp_style(sk, TCP))
4405 if (sctp_sk(sk)->ep->base.bind_addr.port)
4408 if (optlen < sizeof(int))
4411 if (get_user(val, (int __user *)optval))
4414 sctp_sk(sk)->reuse = !!val;
4419 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4420 struct sctp_association *asoc)
4422 struct sctp_ulpevent *event;
4424 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4426 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4427 if (sctp_outq_is_empty(&asoc->outqueue)) {
4428 event = sctp_ulpevent_make_sender_dry_event(asoc,
4429 GFP_USER | __GFP_NOWARN);
4433 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4440 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4441 unsigned int optlen)
4443 struct sctp_sock *sp = sctp_sk(sk);
4444 struct sctp_association *asoc;
4445 struct sctp_event param;
4448 if (optlen < sizeof(param))
4451 optlen = sizeof(param);
4452 if (copy_from_user(¶m, optval, optlen))
4455 if (param.se_type < SCTP_SN_TYPE_BASE ||
4456 param.se_type > SCTP_SN_TYPE_MAX)
4459 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4460 if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4461 sctp_style(sk, UDP))
4465 return sctp_assoc_ulpevent_type_set(¶m, asoc);
4467 if (sctp_style(sk, TCP))
4468 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4470 if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4471 param.se_assoc_id == SCTP_ALL_ASSOC)
4472 sctp_ulpevent_type_set(&sp->subscribe,
4473 param.se_type, param.se_on);
4475 if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4476 param.se_assoc_id == SCTP_ALL_ASSOC) {
4477 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4478 int ret = sctp_assoc_ulpevent_type_set(¶m, asoc);
4488 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4489 char __user *optval,
4490 unsigned int optlen)
4492 struct sctp_assoc_value params;
4493 struct sctp_association *asoc;
4494 struct sctp_endpoint *ep;
4495 int retval = -EINVAL;
4497 if (optlen != sizeof(params))
4500 if (copy_from_user(¶ms, optval, optlen)) {
4505 asoc = sctp_id2assoc(sk, params.assoc_id);
4506 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4507 sctp_style(sk, UDP))
4510 ep = sctp_sk(sk)->ep;
4511 ep->asconf_enable = !!params.assoc_value;
4513 if (ep->asconf_enable && ep->auth_enable) {
4514 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4515 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4524 static int sctp_setsockopt_auth_supported(struct sock *sk,
4525 char __user *optval,
4526 unsigned int optlen)
4528 struct sctp_assoc_value params;
4529 struct sctp_association *asoc;
4530 struct sctp_endpoint *ep;
4531 int retval = -EINVAL;
4533 if (optlen != sizeof(params))
4536 if (copy_from_user(¶ms, optval, optlen)) {
4541 asoc = sctp_id2assoc(sk, params.assoc_id);
4542 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4543 sctp_style(sk, UDP))
4546 ep = sctp_sk(sk)->ep;
4547 if (params.assoc_value) {
4548 retval = sctp_auth_init(ep, GFP_KERNEL);
4551 if (ep->asconf_enable) {
4552 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4553 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4557 ep->auth_enable = !!params.assoc_value;
4564 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4565 char __user *optval,
4566 unsigned int optlen)
4568 struct sctp_assoc_value params;
4569 struct sctp_association *asoc;
4570 int retval = -EINVAL;
4572 if (optlen != sizeof(params))
4575 if (copy_from_user(¶ms, optval, optlen)) {
4580 asoc = sctp_id2assoc(sk, params.assoc_id);
4581 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4582 sctp_style(sk, UDP))
4585 sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
4592 /* API 6.2 setsockopt(), getsockopt()
4594 * Applications use setsockopt() and getsockopt() to set or retrieve
4595 * socket options. Socket options are used to change the default
4596 * behavior of sockets calls. They are described in Section 7.
4600 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4601 * int __user *optlen);
4602 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4605 * sd - the socket descript.
4606 * level - set to IPPROTO_SCTP for all SCTP options.
4607 * optname - the option name.
4608 * optval - the buffer to store the value of the option.
4609 * optlen - the size of the buffer.
4611 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4612 char __user *optval, unsigned int optlen)
4616 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4618 /* I can hardly begin to describe how wrong this is. This is
4619 * so broken as to be worse than useless. The API draft
4620 * REALLY is NOT helpful here... I am not convinced that the
4621 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4622 * are at all well-founded.
4624 if (level != SOL_SCTP) {
4625 struct sctp_af *af = sctp_sk(sk)->pf->af;
4626 retval = af->setsockopt(sk, level, optname, optval, optlen);
4633 case SCTP_SOCKOPT_BINDX_ADD:
4634 /* 'optlen' is the size of the addresses buffer. */
4635 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4636 optlen, SCTP_BINDX_ADD_ADDR);
4639 case SCTP_SOCKOPT_BINDX_REM:
4640 /* 'optlen' is the size of the addresses buffer. */
4641 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4642 optlen, SCTP_BINDX_REM_ADDR);
4645 case SCTP_SOCKOPT_CONNECTX_OLD:
4646 /* 'optlen' is the size of the addresses buffer. */
4647 retval = sctp_setsockopt_connectx_old(sk,
4648 (struct sockaddr __user *)optval,
4652 case SCTP_SOCKOPT_CONNECTX:
4653 /* 'optlen' is the size of the addresses buffer. */
4654 retval = sctp_setsockopt_connectx(sk,
4655 (struct sockaddr __user *)optval,
4659 case SCTP_DISABLE_FRAGMENTS:
4660 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4664 retval = sctp_setsockopt_events(sk, optval, optlen);
4667 case SCTP_AUTOCLOSE:
4668 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4671 case SCTP_PEER_ADDR_PARAMS:
4672 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4675 case SCTP_DELAYED_SACK:
4676 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4678 case SCTP_PARTIAL_DELIVERY_POINT:
4679 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4683 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4685 case SCTP_DEFAULT_SEND_PARAM:
4686 retval = sctp_setsockopt_default_send_param(sk, optval,
4689 case SCTP_DEFAULT_SNDINFO:
4690 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4692 case SCTP_PRIMARY_ADDR:
4693 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4695 case SCTP_SET_PEER_PRIMARY_ADDR:
4696 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4699 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4702 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4704 case SCTP_ASSOCINFO:
4705 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4707 case SCTP_I_WANT_MAPPED_V4_ADDR:
4708 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4711 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4713 case SCTP_ADAPTATION_LAYER:
4714 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4717 retval = sctp_setsockopt_context(sk, optval, optlen);
4719 case SCTP_FRAGMENT_INTERLEAVE:
4720 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4722 case SCTP_MAX_BURST:
4723 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4725 case SCTP_AUTH_CHUNK:
4726 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4728 case SCTP_HMAC_IDENT:
4729 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4732 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4734 case SCTP_AUTH_ACTIVE_KEY:
4735 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4737 case SCTP_AUTH_DELETE_KEY:
4738 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4740 case SCTP_AUTH_DEACTIVATE_KEY:
4741 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4743 case SCTP_AUTO_ASCONF:
4744 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4746 case SCTP_PEER_ADDR_THLDS:
4747 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4749 case SCTP_RECVRCVINFO:
4750 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4752 case SCTP_RECVNXTINFO:
4753 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4755 case SCTP_PR_SUPPORTED:
4756 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4758 case SCTP_DEFAULT_PRINFO:
4759 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4761 case SCTP_RECONFIG_SUPPORTED:
4762 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4764 case SCTP_ENABLE_STREAM_RESET:
4765 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4767 case SCTP_RESET_STREAMS:
4768 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4770 case SCTP_RESET_ASSOC:
4771 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4773 case SCTP_ADD_STREAMS:
4774 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4776 case SCTP_STREAM_SCHEDULER:
4777 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4779 case SCTP_STREAM_SCHEDULER_VALUE:
4780 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4782 case SCTP_INTERLEAVING_SUPPORTED:
4783 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4786 case SCTP_REUSE_PORT:
4787 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4790 retval = sctp_setsockopt_event(sk, optval, optlen);
4792 case SCTP_ASCONF_SUPPORTED:
4793 retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
4795 case SCTP_AUTH_SUPPORTED:
4796 retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
4798 case SCTP_ECN_SUPPORTED:
4799 retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
4802 retval = -ENOPROTOOPT;
4812 /* API 3.1.6 connect() - UDP Style Syntax
4814 * An application may use the connect() call in the UDP model to initiate an
4815 * association without sending data.
4819 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4821 * sd: the socket descriptor to have a new association added to.
4823 * nam: the address structure (either struct sockaddr_in or struct
4824 * sockaddr_in6 defined in RFC2553 [7]).
4826 * len: the size of the address.
4828 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4829 int addr_len, int flags)
4835 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4838 /* Validate addr_len before calling common connect/connectx routine. */
4839 af = sctp_get_af_specific(addr->sa_family);
4840 if (af && addr_len >= af->sockaddr_len)
4841 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4847 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4848 int addr_len, int flags)
4850 if (addr_len < sizeof(uaddr->sa_family))
4853 if (uaddr->sa_family == AF_UNSPEC)
4856 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4859 /* FIXME: Write comments. */
4860 static int sctp_disconnect(struct sock *sk, int flags)
4862 return -EOPNOTSUPP; /* STUB */
4865 /* 4.1.4 accept() - TCP Style Syntax
4867 * Applications use accept() call to remove an established SCTP
4868 * association from the accept queue of the endpoint. A new socket
4869 * descriptor will be returned from accept() to represent the newly
4870 * formed association.
4872 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4874 struct sctp_sock *sp;
4875 struct sctp_endpoint *ep;
4876 struct sock *newsk = NULL;
4877 struct sctp_association *asoc;
4886 if (!sctp_style(sk, TCP)) {
4887 error = -EOPNOTSUPP;
4891 if (!sctp_sstate(sk, LISTENING)) {
4896 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4898 error = sctp_wait_for_accept(sk, timeo);
4902 /* We treat the list of associations on the endpoint as the accept
4903 * queue and pick the first association on the list.
4905 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4907 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4913 /* Populate the fields of the newsk from the oldsk and migrate the
4914 * asoc to the newsk.
4916 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4918 sk_common_release(newsk);
4928 /* The SCTP ioctl handler. */
4929 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4936 * SEQPACKET-style sockets in LISTENING state are valid, for
4937 * SCTP, so only discard TCP-style sockets in LISTENING state.
4939 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4944 struct sk_buff *skb;
4945 unsigned int amount = 0;
4947 skb = skb_peek(&sk->sk_receive_queue);
4950 * We will only return the amount of this packet since
4951 * that is all that will be read.
4955 rc = put_user(amount, (int __user *)arg);
4967 /* This is the function which gets called during socket creation to
4968 * initialized the SCTP-specific portion of the sock.
4969 * The sock structure should already be zero-filled memory.
4971 static int sctp_init_sock(struct sock *sk)
4973 struct net *net = sock_net(sk);
4974 struct sctp_sock *sp;
4976 pr_debug("%s: sk:%p\n", __func__, sk);
4980 /* Initialize the SCTP per socket area. */
4981 switch (sk->sk_type) {
4982 case SOCK_SEQPACKET:
4983 sp->type = SCTP_SOCKET_UDP;
4986 sp->type = SCTP_SOCKET_TCP;
4989 return -ESOCKTNOSUPPORT;
4992 sk->sk_gso_type = SKB_GSO_SCTP;
4994 /* Initialize default send parameters. These parameters can be
4995 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4997 sp->default_stream = 0;
4998 sp->default_ppid = 0;
4999 sp->default_flags = 0;
5000 sp->default_context = 0;
5001 sp->default_timetolive = 0;
5003 sp->default_rcv_context = 0;
5004 sp->max_burst = net->sctp.max_burst;
5006 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5008 /* Initialize default setup parameters. These parameters
5009 * can be modified with the SCTP_INITMSG socket option or
5010 * overridden by the SCTP_INIT CMSG.
5012 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
5013 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
5014 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
5015 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5017 /* Initialize default RTO related parameters. These parameters can
5018 * be modified for with the SCTP_RTOINFO socket option.
5020 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5021 sp->rtoinfo.srto_max = net->sctp.rto_max;
5022 sp->rtoinfo.srto_min = net->sctp.rto_min;
5024 /* Initialize default association related parameters. These parameters
5025 * can be modified with the SCTP_ASSOCINFO socket option.
5027 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5028 sp->assocparams.sasoc_number_peer_destinations = 0;
5029 sp->assocparams.sasoc_peer_rwnd = 0;
5030 sp->assocparams.sasoc_local_rwnd = 0;
5031 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5033 /* Initialize default event subscriptions. By default, all the
5038 /* Default Peer Address Parameters. These defaults can
5039 * be modified via SCTP_PEER_ADDR_PARAMS
5041 sp->hbinterval = net->sctp.hb_interval;
5042 sp->pathmaxrxt = net->sctp.max_retrans_path;
5043 sp->pf_retrans = net->sctp.pf_retrans;
5044 sp->pathmtu = 0; /* allow default discovery */
5045 sp->sackdelay = net->sctp.sack_timeout;
5047 sp->param_flags = SPP_HB_ENABLE |
5049 SPP_SACKDELAY_ENABLE;
5050 sp->default_ss = SCTP_SS_DEFAULT;
5052 /* If enabled no SCTP message fragmentation will be performed.
5053 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5055 sp->disable_fragments = 0;
5057 /* Enable Nagle algorithm by default. */
5060 sp->recvrcvinfo = 0;
5061 sp->recvnxtinfo = 0;
5063 /* Enable by default. */
5066 /* Auto-close idle associations after the configured
5067 * number of seconds. A value of 0 disables this
5068 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5069 * for UDP-style sockets only.
5073 /* User specified fragmentation limit. */
5076 sp->adaptation_ind = 0;
5078 sp->pf = sctp_get_pf_specific(sk->sk_family);
5080 /* Control variables for partial data delivery. */
5081 atomic_set(&sp->pd_mode, 0);
5082 skb_queue_head_init(&sp->pd_lobby);
5083 sp->frag_interleave = 0;
5085 /* Create a per socket endpoint structure. Even if we
5086 * change the data structure relationships, this may still
5087 * be useful for storing pre-connect address information.
5089 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5095 sk->sk_destruct = sctp_destruct_sock;
5097 SCTP_DBG_OBJCNT_INC(sock);
5100 sk_sockets_allocated_inc(sk);
5101 sock_prot_inuse_add(net, sk->sk_prot, 1);
5103 /* Nothing can fail after this block, otherwise
5104 * sctp_destroy_sock() will be called without addr_wq_lock held
5106 if (net->sctp.default_auto_asconf) {
5107 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5108 list_add_tail(&sp->auto_asconf_list,
5109 &net->sctp.auto_asconf_splist);
5110 sp->do_auto_asconf = 1;
5111 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5113 sp->do_auto_asconf = 0;
5121 /* Cleanup any SCTP per socket resources. Must be called with
5122 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5124 static void sctp_destroy_sock(struct sock *sk)
5126 struct sctp_sock *sp;
5128 pr_debug("%s: sk:%p\n", __func__, sk);
5130 /* Release our hold on the endpoint. */
5132 /* This could happen during socket init, thus we bail out
5133 * early, since the rest of the below is not setup either.
5138 if (sp->do_auto_asconf) {
5139 sp->do_auto_asconf = 0;
5140 list_del(&sp->auto_asconf_list);
5142 sctp_endpoint_free(sp->ep);
5144 sk_sockets_allocated_dec(sk);
5145 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5149 /* Triggered when there are no references on the socket anymore */
5150 static void sctp_destruct_sock(struct sock *sk)
5152 struct sctp_sock *sp = sctp_sk(sk);
5154 /* Free up the HMAC transform. */
5155 crypto_free_shash(sp->hmac);
5157 inet_sock_destruct(sk);
5160 /* API 4.1.7 shutdown() - TCP Style Syntax
5161 * int shutdown(int socket, int how);
5163 * sd - the socket descriptor of the association to be closed.
5164 * how - Specifies the type of shutdown. The values are
5167 * Disables further receive operations. No SCTP
5168 * protocol action is taken.
5170 * Disables further send operations, and initiates
5171 * the SCTP shutdown sequence.
5173 * Disables further send and receive operations
5174 * and initiates the SCTP shutdown sequence.
5176 static void sctp_shutdown(struct sock *sk, int how)
5178 struct net *net = sock_net(sk);
5179 struct sctp_endpoint *ep;
5181 if (!sctp_style(sk, TCP))
5184 ep = sctp_sk(sk)->ep;
5185 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5186 struct sctp_association *asoc;
5188 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5189 asoc = list_entry(ep->asocs.next,
5190 struct sctp_association, asocs);
5191 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5195 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5196 struct sctp_info *info)
5198 struct sctp_transport *prim;
5199 struct list_head *pos;
5202 memset(info, 0, sizeof(*info));
5204 struct sctp_sock *sp = sctp_sk(sk);
5206 info->sctpi_s_autoclose = sp->autoclose;
5207 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5208 info->sctpi_s_pd_point = sp->pd_point;
5209 info->sctpi_s_nodelay = sp->nodelay;
5210 info->sctpi_s_disable_fragments = sp->disable_fragments;
5211 info->sctpi_s_v4mapped = sp->v4mapped;
5212 info->sctpi_s_frag_interleave = sp->frag_interleave;
5213 info->sctpi_s_type = sp->type;
5218 info->sctpi_tag = asoc->c.my_vtag;
5219 info->sctpi_state = asoc->state;
5220 info->sctpi_rwnd = asoc->a_rwnd;
5221 info->sctpi_unackdata = asoc->unack_data;
5222 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5223 info->sctpi_instrms = asoc->stream.incnt;
5224 info->sctpi_outstrms = asoc->stream.outcnt;
5225 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5226 info->sctpi_inqueue++;
5227 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5228 info->sctpi_outqueue++;
5229 info->sctpi_overall_error = asoc->overall_error_count;
5230 info->sctpi_max_burst = asoc->max_burst;
5231 info->sctpi_maxseg = asoc->frag_point;
5232 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5233 info->sctpi_peer_tag = asoc->c.peer_vtag;
5235 mask = asoc->peer.ecn_capable << 1;
5236 mask = (mask | asoc->peer.ipv4_address) << 1;
5237 mask = (mask | asoc->peer.ipv6_address) << 1;
5238 mask = (mask | asoc->peer.hostname_address) << 1;
5239 mask = (mask | asoc->peer.asconf_capable) << 1;
5240 mask = (mask | asoc->peer.prsctp_capable) << 1;
5241 mask = (mask | asoc->peer.auth_capable);
5242 info->sctpi_peer_capable = mask;
5243 mask = asoc->peer.sack_needed << 1;
5244 mask = (mask | asoc->peer.sack_generation) << 1;
5245 mask = (mask | asoc->peer.zero_window_announced);
5246 info->sctpi_peer_sack = mask;
5248 info->sctpi_isacks = asoc->stats.isacks;
5249 info->sctpi_osacks = asoc->stats.osacks;
5250 info->sctpi_opackets = asoc->stats.opackets;
5251 info->sctpi_ipackets = asoc->stats.ipackets;
5252 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5253 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5254 info->sctpi_idupchunks = asoc->stats.idupchunks;
5255 info->sctpi_gapcnt = asoc->stats.gapcnt;
5256 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5257 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5258 info->sctpi_oodchunks = asoc->stats.oodchunks;
5259 info->sctpi_iodchunks = asoc->stats.iodchunks;
5260 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5261 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5263 prim = asoc->peer.primary_path;
5264 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5265 info->sctpi_p_state = prim->state;
5266 info->sctpi_p_cwnd = prim->cwnd;
5267 info->sctpi_p_srtt = prim->srtt;
5268 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5269 info->sctpi_p_hbinterval = prim->hbinterval;
5270 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5271 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5272 info->sctpi_p_ssthresh = prim->ssthresh;
5273 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5274 info->sctpi_p_flight_size = prim->flight_size;
5275 info->sctpi_p_error = prim->error_count;
5279 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5281 /* use callback to avoid exporting the core structure */
5282 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5284 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5286 rhashtable_walk_start(iter);
5289 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5291 rhashtable_walk_stop(iter);
5292 rhashtable_walk_exit(iter);
5295 struct sctp_transport *sctp_transport_get_next(struct net *net,
5296 struct rhashtable_iter *iter)
5298 struct sctp_transport *t;
5300 t = rhashtable_walk_next(iter);
5301 for (; t; t = rhashtable_walk_next(iter)) {
5303 if (PTR_ERR(t) == -EAGAIN)
5308 if (!sctp_transport_hold(t))
5311 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5312 t->asoc->peer.primary_path == t)
5315 sctp_transport_put(t);
5321 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5322 struct rhashtable_iter *iter,
5325 struct sctp_transport *t;
5328 return SEQ_START_TOKEN;
5330 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5333 sctp_transport_put(t);
5339 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5343 struct sctp_ep_common *epb;
5344 struct sctp_hashbucket *head;
5346 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5348 read_lock_bh(&head->lock);
5349 sctp_for_each_hentry(epb, &head->chain) {
5350 err = cb(sctp_ep(epb), p);
5354 read_unlock_bh(&head->lock);
5359 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5361 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5363 const union sctp_addr *laddr,
5364 const union sctp_addr *paddr, void *p)
5366 struct sctp_transport *transport;
5370 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5375 err = cb(transport, p);
5376 sctp_transport_put(transport);
5380 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5382 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5383 int (*cb_done)(struct sctp_transport *, void *),
5384 struct net *net, int *pos, void *p) {
5385 struct rhashtable_iter hti;
5386 struct sctp_transport *tsp;
5391 sctp_transport_walk_start(&hti);
5393 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5394 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5399 sctp_transport_put(tsp);
5401 sctp_transport_walk_stop(&hti);
5404 if (cb_done && !cb_done(tsp, p)) {
5406 sctp_transport_put(tsp);
5409 sctp_transport_put(tsp);
5414 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5416 /* 7.2.1 Association Status (SCTP_STATUS)
5418 * Applications can retrieve current status information about an
5419 * association, including association state, peer receiver window size,
5420 * number of unacked data chunks, and number of data chunks pending
5421 * receipt. This information is read-only.
5423 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5424 char __user *optval,
5427 struct sctp_status status;
5428 struct sctp_association *asoc = NULL;
5429 struct sctp_transport *transport;
5430 sctp_assoc_t associd;
5433 if (len < sizeof(status)) {
5438 len = sizeof(status);
5439 if (copy_from_user(&status, optval, len)) {
5444 associd = status.sstat_assoc_id;
5445 asoc = sctp_id2assoc(sk, associd);
5451 transport = asoc->peer.primary_path;
5453 status.sstat_assoc_id = sctp_assoc2id(asoc);
5454 status.sstat_state = sctp_assoc_to_state(asoc);
5455 status.sstat_rwnd = asoc->peer.rwnd;
5456 status.sstat_unackdata = asoc->unack_data;
5458 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5459 status.sstat_instrms = asoc->stream.incnt;
5460 status.sstat_outstrms = asoc->stream.outcnt;
5461 status.sstat_fragmentation_point = asoc->frag_point;
5462 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5463 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5464 transport->af_specific->sockaddr_len);
5465 /* Map ipv4 address into v4-mapped-on-v6 address. */
5466 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5467 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5468 status.sstat_primary.spinfo_state = transport->state;
5469 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5470 status.sstat_primary.spinfo_srtt = transport->srtt;
5471 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5472 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5474 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5475 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5477 if (put_user(len, optlen)) {
5482 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5483 __func__, len, status.sstat_state, status.sstat_rwnd,
5484 status.sstat_assoc_id);
5486 if (copy_to_user(optval, &status, len)) {
5496 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5498 * Applications can retrieve information about a specific peer address
5499 * of an association, including its reachability state, congestion
5500 * window, and retransmission timer values. This information is
5503 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5504 char __user *optval,
5507 struct sctp_paddrinfo pinfo;
5508 struct sctp_transport *transport;
5511 if (len < sizeof(pinfo)) {
5516 len = sizeof(pinfo);
5517 if (copy_from_user(&pinfo, optval, len)) {
5522 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5523 pinfo.spinfo_assoc_id);
5527 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5528 pinfo.spinfo_state = transport->state;
5529 pinfo.spinfo_cwnd = transport->cwnd;
5530 pinfo.spinfo_srtt = transport->srtt;
5531 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5532 pinfo.spinfo_mtu = transport->pathmtu;
5534 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5535 pinfo.spinfo_state = SCTP_ACTIVE;
5537 if (put_user(len, optlen)) {
5542 if (copy_to_user(optval, &pinfo, len)) {
5551 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5553 * This option is a on/off flag. If enabled no SCTP message
5554 * fragmentation will be performed. Instead if a message being sent
5555 * exceeds the current PMTU size, the message will NOT be sent and
5556 * instead a error will be indicated to the user.
5558 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5559 char __user *optval, int __user *optlen)
5563 if (len < sizeof(int))
5567 val = (sctp_sk(sk)->disable_fragments == 1);
5568 if (put_user(len, optlen))
5570 if (copy_to_user(optval, &val, len))
5575 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5577 * This socket option is used to specify various notifications and
5578 * ancillary data the user wishes to receive.
5580 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5583 struct sctp_event_subscribe subscribe;
5584 __u8 *sn_type = (__u8 *)&subscribe;
5589 if (len > sizeof(struct sctp_event_subscribe))
5590 len = sizeof(struct sctp_event_subscribe);
5591 if (put_user(len, optlen))
5594 for (i = 0; i < len; i++)
5595 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5596 SCTP_SN_TYPE_BASE + i);
5598 if (copy_to_user(optval, &subscribe, len))
5604 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5606 * This socket option is applicable to the UDP-style socket only. When
5607 * set it will cause associations that are idle for more than the
5608 * specified number of seconds to automatically close. An association
5609 * being idle is defined an association that has NOT sent or received
5610 * user data. The special value of '0' indicates that no automatic
5611 * close of any associations should be performed. The option expects an
5612 * integer defining the number of seconds of idle time before an
5613 * association is closed.
5615 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5617 /* Applicable to UDP-style socket only */
5618 if (sctp_style(sk, TCP))
5620 if (len < sizeof(int))
5623 if (put_user(len, optlen))
5625 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5630 /* Helper routine to branch off an association to a new socket. */
5631 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5633 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5634 struct sctp_sock *sp = sctp_sk(sk);
5635 struct socket *sock;
5638 /* Do not peel off from one netns to another one. */
5639 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5645 /* An association cannot be branched off from an already peeled-off
5646 * socket, nor is this supported for tcp style sockets.
5648 if (!sctp_style(sk, UDP))
5651 /* Create a new socket. */
5652 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5656 sctp_copy_sock(sock->sk, sk, asoc);
5658 /* Make peeled-off sockets more like 1-1 accepted sockets.
5659 * Set the daddr and initialize id to something more random and also
5660 * copy over any ip options.
5662 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5663 sp->pf->copy_ip_options(sk, sock->sk);
5665 /* Populate the fields of the newsk from the oldsk and migrate the
5666 * asoc to the newsk.
5668 err = sctp_sock_migrate(sk, sock->sk, asoc,
5669 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5679 EXPORT_SYMBOL(sctp_do_peeloff);
5681 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5682 struct file **newfile, unsigned flags)
5684 struct socket *newsock;
5687 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5691 /* Map the socket to an unused fd that can be returned to the user. */
5692 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5694 sock_release(newsock);
5698 *newfile = sock_alloc_file(newsock, 0, NULL);
5699 if (IS_ERR(*newfile)) {
5700 put_unused_fd(retval);
5701 retval = PTR_ERR(*newfile);
5706 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5709 peeloff->sd = retval;
5711 if (flags & SOCK_NONBLOCK)
5712 (*newfile)->f_flags |= O_NONBLOCK;
5717 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5719 sctp_peeloff_arg_t peeloff;
5720 struct file *newfile = NULL;
5723 if (len < sizeof(sctp_peeloff_arg_t))
5725 len = sizeof(sctp_peeloff_arg_t);
5726 if (copy_from_user(&peeloff, optval, len))
5729 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5733 /* Return the fd mapped to the new socket. */
5734 if (put_user(len, optlen)) {
5736 put_unused_fd(retval);
5740 if (copy_to_user(optval, &peeloff, len)) {
5742 put_unused_fd(retval);
5745 fd_install(retval, newfile);
5750 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5751 char __user *optval, int __user *optlen)
5753 sctp_peeloff_flags_arg_t peeloff;
5754 struct file *newfile = NULL;
5757 if (len < sizeof(sctp_peeloff_flags_arg_t))
5759 len = sizeof(sctp_peeloff_flags_arg_t);
5760 if (copy_from_user(&peeloff, optval, len))
5763 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5764 &newfile, peeloff.flags);
5768 /* Return the fd mapped to the new socket. */
5769 if (put_user(len, optlen)) {
5771 put_unused_fd(retval);
5775 if (copy_to_user(optval, &peeloff, len)) {
5777 put_unused_fd(retval);
5780 fd_install(retval, newfile);
5785 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5787 * Applications can enable or disable heartbeats for any peer address of
5788 * an association, modify an address's heartbeat interval, force a
5789 * heartbeat to be sent immediately, and adjust the address's maximum
5790 * number of retransmissions sent before an address is considered
5791 * unreachable. The following structure is used to access and modify an
5792 * address's parameters:
5794 * struct sctp_paddrparams {
5795 * sctp_assoc_t spp_assoc_id;
5796 * struct sockaddr_storage spp_address;
5797 * uint32_t spp_hbinterval;
5798 * uint16_t spp_pathmaxrxt;
5799 * uint32_t spp_pathmtu;
5800 * uint32_t spp_sackdelay;
5801 * uint32_t spp_flags;
5804 * spp_assoc_id - (one-to-many style socket) This is filled in the
5805 * application, and identifies the association for
5807 * spp_address - This specifies which address is of interest.
5808 * spp_hbinterval - This contains the value of the heartbeat interval,
5809 * in milliseconds. If a value of zero
5810 * is present in this field then no changes are to
5811 * be made to this parameter.
5812 * spp_pathmaxrxt - This contains the maximum number of
5813 * retransmissions before this address shall be
5814 * considered unreachable. If a value of zero
5815 * is present in this field then no changes are to
5816 * be made to this parameter.
5817 * spp_pathmtu - When Path MTU discovery is disabled the value
5818 * specified here will be the "fixed" path mtu.
5819 * Note that if the spp_address field is empty
5820 * then all associations on this address will
5821 * have this fixed path mtu set upon them.
5823 * spp_sackdelay - When delayed sack is enabled, this value specifies
5824 * the number of milliseconds that sacks will be delayed
5825 * for. This value will apply to all addresses of an
5826 * association if the spp_address field is empty. Note
5827 * also, that if delayed sack is enabled and this
5828 * value is set to 0, no change is made to the last
5829 * recorded delayed sack timer value.
5831 * spp_flags - These flags are used to control various features
5832 * on an association. The flag field may contain
5833 * zero or more of the following options.
5835 * SPP_HB_ENABLE - Enable heartbeats on the
5836 * specified address. Note that if the address
5837 * field is empty all addresses for the association
5838 * have heartbeats enabled upon them.
5840 * SPP_HB_DISABLE - Disable heartbeats on the
5841 * speicifed address. Note that if the address
5842 * field is empty all addresses for the association
5843 * will have their heartbeats disabled. Note also
5844 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5845 * mutually exclusive, only one of these two should
5846 * be specified. Enabling both fields will have
5847 * undetermined results.
5849 * SPP_HB_DEMAND - Request a user initiated heartbeat
5850 * to be made immediately.
5852 * SPP_PMTUD_ENABLE - This field will enable PMTU
5853 * discovery upon the specified address. Note that
5854 * if the address feild is empty then all addresses
5855 * on the association are effected.
5857 * SPP_PMTUD_DISABLE - This field will disable PMTU
5858 * discovery upon the specified address. Note that
5859 * if the address feild is empty then all addresses
5860 * on the association are effected. Not also that
5861 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5862 * exclusive. Enabling both will have undetermined
5865 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5866 * on delayed sack. The time specified in spp_sackdelay
5867 * is used to specify the sack delay for this address. Note
5868 * that if spp_address is empty then all addresses will
5869 * enable delayed sack and take on the sack delay
5870 * value specified in spp_sackdelay.
5871 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5872 * off delayed sack. If the spp_address field is blank then
5873 * delayed sack is disabled for the entire association. Note
5874 * also that this field is mutually exclusive to
5875 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5878 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5879 * setting of the IPV6 flow label value. The value is
5880 * contained in the spp_ipv6_flowlabel field.
5881 * Upon retrieval, this flag will be set to indicate that
5882 * the spp_ipv6_flowlabel field has a valid value returned.
5883 * If a specific destination address is set (in the
5884 * spp_address field), then the value returned is that of
5885 * the address. If just an association is specified (and
5886 * no address), then the association's default flow label
5887 * is returned. If neither an association nor a destination
5888 * is specified, then the socket's default flow label is
5889 * returned. For non-IPv6 sockets, this flag will be left
5892 * SPP_DSCP: Setting this flag enables the setting of the
5893 * Differentiated Services Code Point (DSCP) value
5894 * associated with either the association or a specific
5895 * address. The value is obtained in the spp_dscp field.
5896 * Upon retrieval, this flag will be set to indicate that
5897 * the spp_dscp field has a valid value returned. If a
5898 * specific destination address is set when called (in the
5899 * spp_address field), then that specific destination
5900 * address's DSCP value is returned. If just an association
5901 * is specified, then the association's default DSCP is
5902 * returned. If neither an association nor a destination is
5903 * specified, then the socket's default DSCP is returned.
5905 * spp_ipv6_flowlabel
5906 * - This field is used in conjunction with the
5907 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5908 * The 20 least significant bits are used for the flow
5909 * label. This setting has precedence over any IPv6-layer
5912 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5913 * and contains the DSCP. The 6 most significant bits are
5914 * used for the DSCP. This setting has precedence over any
5915 * IPv4- or IPv6- layer setting.
5917 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5918 char __user *optval, int __user *optlen)
5920 struct sctp_paddrparams params;
5921 struct sctp_transport *trans = NULL;
5922 struct sctp_association *asoc = NULL;
5923 struct sctp_sock *sp = sctp_sk(sk);
5925 if (len >= sizeof(params))
5926 len = sizeof(params);
5927 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5928 spp_ipv6_flowlabel), 4))
5929 len = ALIGN(offsetof(struct sctp_paddrparams,
5930 spp_ipv6_flowlabel), 4);
5934 if (copy_from_user(¶ms, optval, len))
5937 /* If an address other than INADDR_ANY is specified, and
5938 * no transport is found, then the request is invalid.
5940 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5941 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5942 params.spp_assoc_id);
5944 pr_debug("%s: failed no transport\n", __func__);
5949 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5950 * socket is a one to many style socket, and an association
5951 * was not found, then the id was invalid.
5953 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5954 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5955 sctp_style(sk, UDP)) {
5956 pr_debug("%s: failed no association\n", __func__);
5961 /* Fetch transport values. */
5962 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5963 params.spp_pathmtu = trans->pathmtu;
5964 params.spp_pathmaxrxt = trans->pathmaxrxt;
5965 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5967 /*draft-11 doesn't say what to return in spp_flags*/
5968 params.spp_flags = trans->param_flags;
5969 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5970 params.spp_ipv6_flowlabel = trans->flowlabel &
5971 SCTP_FLOWLABEL_VAL_MASK;
5972 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5974 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5975 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5976 params.spp_flags |= SPP_DSCP;
5979 /* Fetch association values. */
5980 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5981 params.spp_pathmtu = asoc->pathmtu;
5982 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5983 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5985 /*draft-11 doesn't say what to return in spp_flags*/
5986 params.spp_flags = asoc->param_flags;
5987 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5988 params.spp_ipv6_flowlabel = asoc->flowlabel &
5989 SCTP_FLOWLABEL_VAL_MASK;
5990 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5992 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5993 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5994 params.spp_flags |= SPP_DSCP;
5997 /* Fetch socket values. */
5998 params.spp_hbinterval = sp->hbinterval;
5999 params.spp_pathmtu = sp->pathmtu;
6000 params.spp_sackdelay = sp->sackdelay;
6001 params.spp_pathmaxrxt = sp->pathmaxrxt;
6003 /*draft-11 doesn't say what to return in spp_flags*/
6004 params.spp_flags = sp->param_flags;
6005 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6006 params.spp_ipv6_flowlabel = sp->flowlabel &
6007 SCTP_FLOWLABEL_VAL_MASK;
6008 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6010 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6011 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6012 params.spp_flags |= SPP_DSCP;
6016 if (copy_to_user(optval, ¶ms, len))
6019 if (put_user(len, optlen))
6026 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6028 * This option will effect the way delayed acks are performed. This
6029 * option allows you to get or set the delayed ack time, in
6030 * milliseconds. It also allows changing the delayed ack frequency.
6031 * Changing the frequency to 1 disables the delayed sack algorithm. If
6032 * the assoc_id is 0, then this sets or gets the endpoints default
6033 * values. If the assoc_id field is non-zero, then the set or get
6034 * effects the specified association for the one to many model (the
6035 * assoc_id field is ignored by the one to one model). Note that if
6036 * sack_delay or sack_freq are 0 when setting this option, then the
6037 * current values will remain unchanged.
6039 * struct sctp_sack_info {
6040 * sctp_assoc_t sack_assoc_id;
6041 * uint32_t sack_delay;
6042 * uint32_t sack_freq;
6045 * sack_assoc_id - This parameter, indicates which association the user
6046 * is performing an action upon. Note that if this field's value is
6047 * zero then the endpoints default value is changed (effecting future
6048 * associations only).
6050 * sack_delay - This parameter contains the number of milliseconds that
6051 * the user is requesting the delayed ACK timer be set to. Note that
6052 * this value is defined in the standard to be between 200 and 500
6055 * sack_freq - This parameter contains the number of packets that must
6056 * be received before a sack is sent without waiting for the delay
6057 * timer to expire. The default value for this is 2, setting this
6058 * value to 1 will disable the delayed sack algorithm.
6060 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6061 char __user *optval,
6064 struct sctp_sack_info params;
6065 struct sctp_association *asoc = NULL;
6066 struct sctp_sock *sp = sctp_sk(sk);
6068 if (len >= sizeof(struct sctp_sack_info)) {
6069 len = sizeof(struct sctp_sack_info);
6071 if (copy_from_user(¶ms, optval, len))
6073 } else if (len == sizeof(struct sctp_assoc_value)) {
6074 pr_warn_ratelimited(DEPRECATED
6076 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6077 "Use struct sctp_sack_info instead\n",
6078 current->comm, task_pid_nr(current));
6079 if (copy_from_user(¶ms, optval, len))
6084 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6085 * socket is a one to many style socket, and an association
6086 * was not found, then the id was invalid.
6088 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6089 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6090 sctp_style(sk, UDP))
6094 /* Fetch association values. */
6095 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6096 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6097 params.sack_freq = asoc->sackfreq;
6100 params.sack_delay = 0;
6101 params.sack_freq = 1;
6104 /* Fetch socket values. */
6105 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6106 params.sack_delay = sp->sackdelay;
6107 params.sack_freq = sp->sackfreq;
6109 params.sack_delay = 0;
6110 params.sack_freq = 1;
6114 if (copy_to_user(optval, ¶ms, len))
6117 if (put_user(len, optlen))
6123 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6125 * Applications can specify protocol parameters for the default association
6126 * initialization. The option name argument to setsockopt() and getsockopt()
6129 * Setting initialization parameters is effective only on an unconnected
6130 * socket (for UDP-style sockets only future associations are effected
6131 * by the change). With TCP-style sockets, this option is inherited by
6132 * sockets derived from a listener socket.
6134 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6136 if (len < sizeof(struct sctp_initmsg))
6138 len = sizeof(struct sctp_initmsg);
6139 if (put_user(len, optlen))
6141 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6147 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6148 char __user *optval, int __user *optlen)
6150 struct sctp_association *asoc;
6152 struct sctp_getaddrs getaddrs;
6153 struct sctp_transport *from;
6155 union sctp_addr temp;
6156 struct sctp_sock *sp = sctp_sk(sk);
6161 if (len < sizeof(struct sctp_getaddrs))
6164 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6167 /* For UDP-style sockets, id specifies the association to query. */
6168 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6172 to = optval + offsetof(struct sctp_getaddrs, addrs);
6173 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6175 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6177 memcpy(&temp, &from->ipaddr, sizeof(temp));
6178 addrlen = sctp_get_pf_specific(sk->sk_family)
6179 ->addr_to_user(sp, &temp);
6180 if (space_left < addrlen)
6182 if (copy_to_user(to, &temp, addrlen))
6186 space_left -= addrlen;
6189 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6191 bytes_copied = ((char __user *)to) - optval;
6192 if (put_user(bytes_copied, optlen))
6198 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6199 size_t space_left, int *bytes_copied)
6201 struct sctp_sockaddr_entry *addr;
6202 union sctp_addr temp;
6205 struct net *net = sock_net(sk);
6208 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6212 if ((PF_INET == sk->sk_family) &&
6213 (AF_INET6 == addr->a.sa.sa_family))
6215 if ((PF_INET6 == sk->sk_family) &&
6216 inet_v6_ipv6only(sk) &&
6217 (AF_INET == addr->a.sa.sa_family))
6219 memcpy(&temp, &addr->a, sizeof(temp));
6220 if (!temp.v4.sin_port)
6221 temp.v4.sin_port = htons(port);
6223 addrlen = sctp_get_pf_specific(sk->sk_family)
6224 ->addr_to_user(sctp_sk(sk), &temp);
6226 if (space_left < addrlen) {
6230 memcpy(to, &temp, addrlen);
6234 space_left -= addrlen;
6235 *bytes_copied += addrlen;
6243 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6244 char __user *optval, int __user *optlen)
6246 struct sctp_bind_addr *bp;
6247 struct sctp_association *asoc;
6249 struct sctp_getaddrs getaddrs;
6250 struct sctp_sockaddr_entry *addr;
6252 union sctp_addr temp;
6253 struct sctp_sock *sp = sctp_sk(sk);
6257 int bytes_copied = 0;
6261 if (len < sizeof(struct sctp_getaddrs))
6264 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6268 * For UDP-style sockets, id specifies the association to query.
6269 * If the id field is set to the value '0' then the locally bound
6270 * addresses are returned without regard to any particular
6273 if (0 == getaddrs.assoc_id) {
6274 bp = &sctp_sk(sk)->ep->base.bind_addr;
6276 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6279 bp = &asoc->base.bind_addr;
6282 to = optval + offsetof(struct sctp_getaddrs, addrs);
6283 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6285 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6289 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6290 * addresses from the global local address list.
6292 if (sctp_list_single_entry(&bp->address_list)) {
6293 addr = list_entry(bp->address_list.next,
6294 struct sctp_sockaddr_entry, list);
6295 if (sctp_is_any(sk, &addr->a)) {
6296 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6297 space_left, &bytes_copied);
6307 /* Protection on the bound address list is not needed since
6308 * in the socket option context we hold a socket lock and
6309 * thus the bound address list can't change.
6311 list_for_each_entry(addr, &bp->address_list, list) {
6312 memcpy(&temp, &addr->a, sizeof(temp));
6313 addrlen = sctp_get_pf_specific(sk->sk_family)
6314 ->addr_to_user(sp, &temp);
6315 if (space_left < addrlen) {
6316 err = -ENOMEM; /*fixme: right error?*/
6319 memcpy(buf, &temp, addrlen);
6321 bytes_copied += addrlen;
6323 space_left -= addrlen;
6327 if (copy_to_user(to, addrs, bytes_copied)) {
6331 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6335 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6336 * but we can't change it anymore.
6338 if (put_user(bytes_copied, optlen))
6345 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6347 * Requests that the local SCTP stack use the enclosed peer address as
6348 * the association primary. The enclosed address must be one of the
6349 * association peer's addresses.
6351 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6352 char __user *optval, int __user *optlen)
6354 struct sctp_prim prim;
6355 struct sctp_association *asoc;
6356 struct sctp_sock *sp = sctp_sk(sk);
6358 if (len < sizeof(struct sctp_prim))
6361 len = sizeof(struct sctp_prim);
6363 if (copy_from_user(&prim, optval, len))
6366 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6370 if (!asoc->peer.primary_path)
6373 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6374 asoc->peer.primary_path->af_specific->sockaddr_len);
6376 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6377 (union sctp_addr *)&prim.ssp_addr);
6379 if (put_user(len, optlen))
6381 if (copy_to_user(optval, &prim, len))
6388 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6390 * Requests that the local endpoint set the specified Adaptation Layer
6391 * Indication parameter for all future INIT and INIT-ACK exchanges.
6393 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6394 char __user *optval, int __user *optlen)
6396 struct sctp_setadaptation adaptation;
6398 if (len < sizeof(struct sctp_setadaptation))
6401 len = sizeof(struct sctp_setadaptation);
6403 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6405 if (put_user(len, optlen))
6407 if (copy_to_user(optval, &adaptation, len))
6415 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6417 * Applications that wish to use the sendto() system call may wish to
6418 * specify a default set of parameters that would normally be supplied
6419 * through the inclusion of ancillary data. This socket option allows
6420 * such an application to set the default sctp_sndrcvinfo structure.
6423 * The application that wishes to use this socket option simply passes
6424 * in to this call the sctp_sndrcvinfo structure defined in Section
6425 * 5.2.2) The input parameters accepted by this call include
6426 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6427 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6428 * to this call if the caller is using the UDP model.
6430 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6432 static int sctp_getsockopt_default_send_param(struct sock *sk,
6433 int len, char __user *optval,
6436 struct sctp_sock *sp = sctp_sk(sk);
6437 struct sctp_association *asoc;
6438 struct sctp_sndrcvinfo info;
6440 if (len < sizeof(info))
6445 if (copy_from_user(&info, optval, len))
6448 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6449 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6450 sctp_style(sk, UDP))
6454 info.sinfo_stream = asoc->default_stream;
6455 info.sinfo_flags = asoc->default_flags;
6456 info.sinfo_ppid = asoc->default_ppid;
6457 info.sinfo_context = asoc->default_context;
6458 info.sinfo_timetolive = asoc->default_timetolive;
6460 info.sinfo_stream = sp->default_stream;
6461 info.sinfo_flags = sp->default_flags;
6462 info.sinfo_ppid = sp->default_ppid;
6463 info.sinfo_context = sp->default_context;
6464 info.sinfo_timetolive = sp->default_timetolive;
6467 if (put_user(len, optlen))
6469 if (copy_to_user(optval, &info, len))
6475 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6476 * (SCTP_DEFAULT_SNDINFO)
6478 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6479 char __user *optval,
6482 struct sctp_sock *sp = sctp_sk(sk);
6483 struct sctp_association *asoc;
6484 struct sctp_sndinfo info;
6486 if (len < sizeof(info))
6491 if (copy_from_user(&info, optval, len))
6494 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6495 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6496 sctp_style(sk, UDP))
6500 info.snd_sid = asoc->default_stream;
6501 info.snd_flags = asoc->default_flags;
6502 info.snd_ppid = asoc->default_ppid;
6503 info.snd_context = asoc->default_context;
6505 info.snd_sid = sp->default_stream;
6506 info.snd_flags = sp->default_flags;
6507 info.snd_ppid = sp->default_ppid;
6508 info.snd_context = sp->default_context;
6511 if (put_user(len, optlen))
6513 if (copy_to_user(optval, &info, len))
6521 * 7.1.5 SCTP_NODELAY
6523 * Turn on/off any Nagle-like algorithm. This means that packets are
6524 * generally sent as soon as possible and no unnecessary delays are
6525 * introduced, at the cost of more packets in the network. Expects an
6526 * integer boolean flag.
6529 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6530 char __user *optval, int __user *optlen)
6534 if (len < sizeof(int))
6538 val = (sctp_sk(sk)->nodelay == 1);
6539 if (put_user(len, optlen))
6541 if (copy_to_user(optval, &val, len))
6548 * 7.1.1 SCTP_RTOINFO
6550 * The protocol parameters used to initialize and bound retransmission
6551 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6552 * and modify these parameters.
6553 * All parameters are time values, in milliseconds. A value of 0, when
6554 * modifying the parameters, indicates that the current value should not
6558 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6559 char __user *optval,
6560 int __user *optlen) {
6561 struct sctp_rtoinfo rtoinfo;
6562 struct sctp_association *asoc;
6564 if (len < sizeof (struct sctp_rtoinfo))
6567 len = sizeof(struct sctp_rtoinfo);
6569 if (copy_from_user(&rtoinfo, optval, len))
6572 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6574 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6575 sctp_style(sk, UDP))
6578 /* Values corresponding to the specific association. */
6580 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6581 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6582 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6584 /* Values corresponding to the endpoint. */
6585 struct sctp_sock *sp = sctp_sk(sk);
6587 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6588 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6589 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6592 if (put_user(len, optlen))
6595 if (copy_to_user(optval, &rtoinfo, len))
6603 * 7.1.2 SCTP_ASSOCINFO
6605 * This option is used to tune the maximum retransmission attempts
6606 * of the association.
6607 * Returns an error if the new association retransmission value is
6608 * greater than the sum of the retransmission value of the peer.
6609 * See [SCTP] for more information.
6612 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6613 char __user *optval,
6617 struct sctp_assocparams assocparams;
6618 struct sctp_association *asoc;
6619 struct list_head *pos;
6622 if (len < sizeof (struct sctp_assocparams))
6625 len = sizeof(struct sctp_assocparams);
6627 if (copy_from_user(&assocparams, optval, len))
6630 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6632 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6633 sctp_style(sk, UDP))
6636 /* Values correspoinding to the specific association */
6638 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6639 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6640 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6641 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6643 list_for_each(pos, &asoc->peer.transport_addr_list) {
6647 assocparams.sasoc_number_peer_destinations = cnt;
6649 /* Values corresponding to the endpoint */
6650 struct sctp_sock *sp = sctp_sk(sk);
6652 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6653 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6654 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6655 assocparams.sasoc_cookie_life =
6656 sp->assocparams.sasoc_cookie_life;
6657 assocparams.sasoc_number_peer_destinations =
6659 sasoc_number_peer_destinations;
6662 if (put_user(len, optlen))
6665 if (copy_to_user(optval, &assocparams, len))
6672 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6674 * This socket option is a boolean flag which turns on or off mapped V4
6675 * addresses. If this option is turned on and the socket is type
6676 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6677 * If this option is turned off, then no mapping will be done of V4
6678 * addresses and a user will receive both PF_INET6 and PF_INET type
6679 * addresses on the socket.
6681 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6682 char __user *optval, int __user *optlen)
6685 struct sctp_sock *sp = sctp_sk(sk);
6687 if (len < sizeof(int))
6692 if (put_user(len, optlen))
6694 if (copy_to_user(optval, &val, len))
6701 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6702 * (chapter and verse is quoted at sctp_setsockopt_context())
6704 static int sctp_getsockopt_context(struct sock *sk, int len,
6705 char __user *optval, int __user *optlen)
6707 struct sctp_assoc_value params;
6708 struct sctp_association *asoc;
6710 if (len < sizeof(struct sctp_assoc_value))
6713 len = sizeof(struct sctp_assoc_value);
6715 if (copy_from_user(¶ms, optval, len))
6718 asoc = sctp_id2assoc(sk, params.assoc_id);
6719 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6720 sctp_style(sk, UDP))
6723 params.assoc_value = asoc ? asoc->default_rcv_context
6724 : sctp_sk(sk)->default_rcv_context;
6726 if (put_user(len, optlen))
6728 if (copy_to_user(optval, ¶ms, len))
6735 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6736 * This option will get or set the maximum size to put in any outgoing
6737 * SCTP DATA chunk. If a message is larger than this size it will be
6738 * fragmented by SCTP into the specified size. Note that the underlying
6739 * SCTP implementation may fragment into smaller sized chunks when the
6740 * PMTU of the underlying association is smaller than the value set by
6741 * the user. The default value for this option is '0' which indicates
6742 * the user is NOT limiting fragmentation and only the PMTU will effect
6743 * SCTP's choice of DATA chunk size. Note also that values set larger
6744 * than the maximum size of an IP datagram will effectively let SCTP
6745 * control fragmentation (i.e. the same as setting this option to 0).
6747 * The following structure is used to access and modify this parameter:
6749 * struct sctp_assoc_value {
6750 * sctp_assoc_t assoc_id;
6751 * uint32_t assoc_value;
6754 * assoc_id: This parameter is ignored for one-to-one style sockets.
6755 * For one-to-many style sockets this parameter indicates which
6756 * association the user is performing an action upon. Note that if
6757 * this field's value is zero then the endpoints default value is
6758 * changed (effecting future associations only).
6759 * assoc_value: This parameter specifies the maximum size in bytes.
6761 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6762 char __user *optval, int __user *optlen)
6764 struct sctp_assoc_value params;
6765 struct sctp_association *asoc;
6767 if (len == sizeof(int)) {
6768 pr_warn_ratelimited(DEPRECATED
6770 "Use of int in maxseg socket option.\n"
6771 "Use struct sctp_assoc_value instead\n",
6772 current->comm, task_pid_nr(current));
6773 params.assoc_id = SCTP_FUTURE_ASSOC;
6774 } else if (len >= sizeof(struct sctp_assoc_value)) {
6775 len = sizeof(struct sctp_assoc_value);
6776 if (copy_from_user(¶ms, optval, len))
6781 asoc = sctp_id2assoc(sk, params.assoc_id);
6782 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6783 sctp_style(sk, UDP))
6787 params.assoc_value = asoc->frag_point;
6789 params.assoc_value = sctp_sk(sk)->user_frag;
6791 if (put_user(len, optlen))
6793 if (len == sizeof(int)) {
6794 if (copy_to_user(optval, ¶ms.assoc_value, len))
6797 if (copy_to_user(optval, ¶ms, len))
6805 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6806 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6808 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6809 char __user *optval, int __user *optlen)
6813 if (len < sizeof(int))
6818 val = sctp_sk(sk)->frag_interleave;
6819 if (put_user(len, optlen))
6821 if (copy_to_user(optval, &val, len))
6828 * 7.1.25. Set or Get the sctp partial delivery point
6829 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6831 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6832 char __user *optval,
6837 if (len < sizeof(u32))
6842 val = sctp_sk(sk)->pd_point;
6843 if (put_user(len, optlen))
6845 if (copy_to_user(optval, &val, len))
6852 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6853 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6855 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6856 char __user *optval,
6859 struct sctp_assoc_value params;
6860 struct sctp_association *asoc;
6862 if (len == sizeof(int)) {
6863 pr_warn_ratelimited(DEPRECATED
6865 "Use of int in max_burst socket option.\n"
6866 "Use struct sctp_assoc_value instead\n",
6867 current->comm, task_pid_nr(current));
6868 params.assoc_id = SCTP_FUTURE_ASSOC;
6869 } else if (len >= sizeof(struct sctp_assoc_value)) {
6870 len = sizeof(struct sctp_assoc_value);
6871 if (copy_from_user(¶ms, optval, len))
6876 asoc = sctp_id2assoc(sk, params.assoc_id);
6877 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6878 sctp_style(sk, UDP))
6881 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6883 if (len == sizeof(int)) {
6884 if (copy_to_user(optval, ¶ms.assoc_value, len))
6887 if (copy_to_user(optval, ¶ms, len))
6895 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6896 char __user *optval, int __user *optlen)
6898 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6899 struct sctp_hmacalgo __user *p = (void __user *)optval;
6900 struct sctp_hmac_algo_param *hmacs;
6905 if (!ep->auth_enable)
6908 hmacs = ep->auth_hmacs_list;
6909 data_len = ntohs(hmacs->param_hdr.length) -
6910 sizeof(struct sctp_paramhdr);
6912 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6915 len = sizeof(struct sctp_hmacalgo) + data_len;
6916 num_idents = data_len / sizeof(u16);
6918 if (put_user(len, optlen))
6920 if (put_user(num_idents, &p->shmac_num_idents))
6922 for (i = 0; i < num_idents; i++) {
6923 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6925 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6931 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6932 char __user *optval, int __user *optlen)
6934 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6935 struct sctp_authkeyid val;
6936 struct sctp_association *asoc;
6938 if (len < sizeof(struct sctp_authkeyid))
6941 len = sizeof(struct sctp_authkeyid);
6942 if (copy_from_user(&val, optval, len))
6945 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6946 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6950 if (!asoc->peer.auth_capable)
6952 val.scact_keynumber = asoc->active_key_id;
6954 if (!ep->auth_enable)
6956 val.scact_keynumber = ep->active_key_id;
6959 if (put_user(len, optlen))
6961 if (copy_to_user(optval, &val, len))
6967 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6968 char __user *optval, int __user *optlen)
6970 struct sctp_authchunks __user *p = (void __user *)optval;
6971 struct sctp_authchunks val;
6972 struct sctp_association *asoc;
6973 struct sctp_chunks_param *ch;
6977 if (len < sizeof(struct sctp_authchunks))
6980 if (copy_from_user(&val, optval, sizeof(val)))
6983 to = p->gauth_chunks;
6984 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6988 if (!asoc->peer.auth_capable)
6991 ch = asoc->peer.peer_chunks;
6995 /* See if the user provided enough room for all the data */
6996 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6997 if (len < num_chunks)
7000 if (copy_to_user(to, ch->chunks, num_chunks))
7003 len = sizeof(struct sctp_authchunks) + num_chunks;
7004 if (put_user(len, optlen))
7006 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7011 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7012 char __user *optval, int __user *optlen)
7014 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7015 struct sctp_authchunks __user *p = (void __user *)optval;
7016 struct sctp_authchunks val;
7017 struct sctp_association *asoc;
7018 struct sctp_chunks_param *ch;
7022 if (len < sizeof(struct sctp_authchunks))
7025 if (copy_from_user(&val, optval, sizeof(val)))
7028 to = p->gauth_chunks;
7029 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7030 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7031 sctp_style(sk, UDP))
7035 if (!asoc->peer.auth_capable)
7037 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7039 if (!ep->auth_enable)
7041 ch = ep->auth_chunk_list;
7046 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7047 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7050 if (copy_to_user(to, ch->chunks, num_chunks))
7053 len = sizeof(struct sctp_authchunks) + num_chunks;
7054 if (put_user(len, optlen))
7056 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7063 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7064 * This option gets the current number of associations that are attached
7065 * to a one-to-many style socket. The option value is an uint32_t.
7067 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7068 char __user *optval, int __user *optlen)
7070 struct sctp_sock *sp = sctp_sk(sk);
7071 struct sctp_association *asoc;
7074 if (sctp_style(sk, TCP))
7077 if (len < sizeof(u32))
7082 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7086 if (put_user(len, optlen))
7088 if (copy_to_user(optval, &val, len))
7095 * 8.1.23 SCTP_AUTO_ASCONF
7096 * See the corresponding setsockopt entry as description
7098 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7099 char __user *optval, int __user *optlen)
7103 if (len < sizeof(int))
7107 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7109 if (put_user(len, optlen))
7111 if (copy_to_user(optval, &val, len))
7117 * 8.2.6. Get the Current Identifiers of Associations
7118 * (SCTP_GET_ASSOC_ID_LIST)
7120 * This option gets the current list of SCTP association identifiers of
7121 * the SCTP associations handled by a one-to-many style socket.
7123 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7124 char __user *optval, int __user *optlen)
7126 struct sctp_sock *sp = sctp_sk(sk);
7127 struct sctp_association *asoc;
7128 struct sctp_assoc_ids *ids;
7131 if (sctp_style(sk, TCP))
7134 if (len < sizeof(struct sctp_assoc_ids))
7137 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7141 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7144 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7146 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7150 ids->gaids_number_of_ids = num;
7152 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7153 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7156 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7166 * SCTP_PEER_ADDR_THLDS
7168 * This option allows us to fetch the partially failed threshold for one or all
7169 * transports in an association. See Section 6.1 of:
7170 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7172 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7173 char __user *optval,
7177 struct sctp_paddrthlds val;
7178 struct sctp_transport *trans;
7179 struct sctp_association *asoc;
7181 if (len < sizeof(struct sctp_paddrthlds))
7183 len = sizeof(struct sctp_paddrthlds);
7184 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
7187 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7188 trans = sctp_addr_id2transport(sk, &val.spt_address,
7193 val.spt_pathmaxrxt = trans->pathmaxrxt;
7194 val.spt_pathpfthld = trans->pf_retrans;
7199 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7200 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7201 sctp_style(sk, UDP))
7205 val.spt_pathpfthld = asoc->pf_retrans;
7206 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7208 struct sctp_sock *sp = sctp_sk(sk);
7210 val.spt_pathpfthld = sp->pf_retrans;
7211 val.spt_pathmaxrxt = sp->pathmaxrxt;
7215 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7222 * SCTP_GET_ASSOC_STATS
7224 * This option retrieves local per endpoint statistics. It is modeled
7225 * after OpenSolaris' implementation
7227 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7228 char __user *optval,
7231 struct sctp_assoc_stats sas;
7232 struct sctp_association *asoc = NULL;
7234 /* User must provide at least the assoc id */
7235 if (len < sizeof(sctp_assoc_t))
7238 /* Allow the struct to grow and fill in as much as possible */
7239 len = min_t(size_t, len, sizeof(sas));
7241 if (copy_from_user(&sas, optval, len))
7244 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7248 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7249 sas.sas_gapcnt = asoc->stats.gapcnt;
7250 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7251 sas.sas_osacks = asoc->stats.osacks;
7252 sas.sas_isacks = asoc->stats.isacks;
7253 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7254 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7255 sas.sas_oodchunks = asoc->stats.oodchunks;
7256 sas.sas_iodchunks = asoc->stats.iodchunks;
7257 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7258 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7259 sas.sas_idupchunks = asoc->stats.idupchunks;
7260 sas.sas_opackets = asoc->stats.opackets;
7261 sas.sas_ipackets = asoc->stats.ipackets;
7263 /* New high max rto observed, will return 0 if not a single
7264 * RTO update took place. obs_rto_ipaddr will be bogus
7267 sas.sas_maxrto = asoc->stats.max_obs_rto;
7268 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7269 sizeof(struct sockaddr_storage));
7271 /* Mark beginning of a new observation period */
7272 asoc->stats.max_obs_rto = asoc->rto_min;
7274 if (put_user(len, optlen))
7277 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7279 if (copy_to_user(optval, &sas, len))
7285 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7286 char __user *optval,
7291 if (len < sizeof(int))
7295 if (sctp_sk(sk)->recvrcvinfo)
7297 if (put_user(len, optlen))
7299 if (copy_to_user(optval, &val, len))
7305 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7306 char __user *optval,
7311 if (len < sizeof(int))
7315 if (sctp_sk(sk)->recvnxtinfo)
7317 if (put_user(len, optlen))
7319 if (copy_to_user(optval, &val, len))
7325 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7326 char __user *optval,
7329 struct sctp_assoc_value params;
7330 struct sctp_association *asoc;
7331 int retval = -EFAULT;
7333 if (len < sizeof(params)) {
7338 len = sizeof(params);
7339 if (copy_from_user(¶ms, optval, len))
7342 asoc = sctp_id2assoc(sk, params.assoc_id);
7343 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7344 sctp_style(sk, UDP)) {
7349 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7350 : sctp_sk(sk)->ep->prsctp_enable;
7352 if (put_user(len, optlen))
7355 if (copy_to_user(optval, ¶ms, len))
7364 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7365 char __user *optval,
7368 struct sctp_default_prinfo info;
7369 struct sctp_association *asoc;
7370 int retval = -EFAULT;
7372 if (len < sizeof(info)) {
7378 if (copy_from_user(&info, optval, len))
7381 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7382 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7383 sctp_style(sk, UDP)) {
7389 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7390 info.pr_value = asoc->default_timetolive;
7392 struct sctp_sock *sp = sctp_sk(sk);
7394 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7395 info.pr_value = sp->default_timetolive;
7398 if (put_user(len, optlen))
7401 if (copy_to_user(optval, &info, len))
7410 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7411 char __user *optval,
7414 struct sctp_prstatus params;
7415 struct sctp_association *asoc;
7417 int retval = -EINVAL;
7419 if (len < sizeof(params))
7422 len = sizeof(params);
7423 if (copy_from_user(¶ms, optval, len)) {
7428 policy = params.sprstat_policy;
7429 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7430 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7433 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7437 if (policy == SCTP_PR_SCTP_ALL) {
7438 params.sprstat_abandoned_unsent = 0;
7439 params.sprstat_abandoned_sent = 0;
7440 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7441 params.sprstat_abandoned_unsent +=
7442 asoc->abandoned_unsent[policy];
7443 params.sprstat_abandoned_sent +=
7444 asoc->abandoned_sent[policy];
7447 params.sprstat_abandoned_unsent =
7448 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7449 params.sprstat_abandoned_sent =
7450 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7453 if (put_user(len, optlen)) {
7458 if (copy_to_user(optval, ¶ms, len)) {
7469 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7470 char __user *optval,
7473 struct sctp_stream_out_ext *streamoute;
7474 struct sctp_association *asoc;
7475 struct sctp_prstatus params;
7476 int retval = -EINVAL;
7479 if (len < sizeof(params))
7482 len = sizeof(params);
7483 if (copy_from_user(¶ms, optval, len)) {
7488 policy = params.sprstat_policy;
7489 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7490 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7493 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7494 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7497 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7499 /* Not allocated yet, means all stats are 0 */
7500 params.sprstat_abandoned_unsent = 0;
7501 params.sprstat_abandoned_sent = 0;
7506 if (policy == SCTP_PR_SCTP_ALL) {
7507 params.sprstat_abandoned_unsent = 0;
7508 params.sprstat_abandoned_sent = 0;
7509 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7510 params.sprstat_abandoned_unsent +=
7511 streamoute->abandoned_unsent[policy];
7512 params.sprstat_abandoned_sent +=
7513 streamoute->abandoned_sent[policy];
7516 params.sprstat_abandoned_unsent =
7517 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7518 params.sprstat_abandoned_sent =
7519 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7522 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7533 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7534 char __user *optval,
7537 struct sctp_assoc_value params;
7538 struct sctp_association *asoc;
7539 int retval = -EFAULT;
7541 if (len < sizeof(params)) {
7546 len = sizeof(params);
7547 if (copy_from_user(¶ms, optval, len))
7550 asoc = sctp_id2assoc(sk, params.assoc_id);
7551 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7552 sctp_style(sk, UDP)) {
7557 params.assoc_value = asoc ? asoc->peer.reconf_capable
7558 : sctp_sk(sk)->ep->reconf_enable;
7560 if (put_user(len, optlen))
7563 if (copy_to_user(optval, ¶ms, len))
7572 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7573 char __user *optval,
7576 struct sctp_assoc_value params;
7577 struct sctp_association *asoc;
7578 int retval = -EFAULT;
7580 if (len < sizeof(params)) {
7585 len = sizeof(params);
7586 if (copy_from_user(¶ms, optval, len))
7589 asoc = sctp_id2assoc(sk, params.assoc_id);
7590 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7591 sctp_style(sk, UDP)) {
7596 params.assoc_value = asoc ? asoc->strreset_enable
7597 : sctp_sk(sk)->ep->strreset_enable;
7599 if (put_user(len, optlen))
7602 if (copy_to_user(optval, ¶ms, len))
7611 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7612 char __user *optval,
7615 struct sctp_assoc_value params;
7616 struct sctp_association *asoc;
7617 int retval = -EFAULT;
7619 if (len < sizeof(params)) {
7624 len = sizeof(params);
7625 if (copy_from_user(¶ms, optval, len))
7628 asoc = sctp_id2assoc(sk, params.assoc_id);
7629 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7630 sctp_style(sk, UDP)) {
7635 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7636 : sctp_sk(sk)->default_ss;
7638 if (put_user(len, optlen))
7641 if (copy_to_user(optval, ¶ms, len))
7650 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7651 char __user *optval,
7654 struct sctp_stream_value params;
7655 struct sctp_association *asoc;
7656 int retval = -EFAULT;
7658 if (len < sizeof(params)) {
7663 len = sizeof(params);
7664 if (copy_from_user(¶ms, optval, len))
7667 asoc = sctp_id2assoc(sk, params.assoc_id);
7673 retval = sctp_sched_get_value(asoc, params.stream_id,
7674 ¶ms.stream_value);
7678 if (put_user(len, optlen)) {
7683 if (copy_to_user(optval, ¶ms, len)) {
7692 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7693 char __user *optval,
7696 struct sctp_assoc_value params;
7697 struct sctp_association *asoc;
7698 int retval = -EFAULT;
7700 if (len < sizeof(params)) {
7705 len = sizeof(params);
7706 if (copy_from_user(¶ms, optval, len))
7709 asoc = sctp_id2assoc(sk, params.assoc_id);
7710 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7711 sctp_style(sk, UDP)) {
7716 params.assoc_value = asoc ? asoc->peer.intl_capable
7717 : sctp_sk(sk)->ep->intl_enable;
7719 if (put_user(len, optlen))
7722 if (copy_to_user(optval, ¶ms, len))
7731 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7732 char __user *optval,
7737 if (len < sizeof(int))
7741 val = sctp_sk(sk)->reuse;
7742 if (put_user(len, optlen))
7745 if (copy_to_user(optval, &val, len))
7751 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7754 struct sctp_association *asoc;
7755 struct sctp_event param;
7758 if (len < sizeof(param))
7761 len = sizeof(param);
7762 if (copy_from_user(¶m, optval, len))
7765 if (param.se_type < SCTP_SN_TYPE_BASE ||
7766 param.se_type > SCTP_SN_TYPE_MAX)
7769 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7770 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7771 sctp_style(sk, UDP))
7774 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7775 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7777 if (put_user(len, optlen))
7780 if (copy_to_user(optval, ¶m, len))
7786 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7787 char __user *optval,
7790 struct sctp_assoc_value params;
7791 struct sctp_association *asoc;
7792 int retval = -EFAULT;
7794 if (len < sizeof(params)) {
7799 len = sizeof(params);
7800 if (copy_from_user(¶ms, optval, len))
7803 asoc = sctp_id2assoc(sk, params.assoc_id);
7804 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7805 sctp_style(sk, UDP)) {
7810 params.assoc_value = asoc ? asoc->peer.asconf_capable
7811 : sctp_sk(sk)->ep->asconf_enable;
7813 if (put_user(len, optlen))
7816 if (copy_to_user(optval, ¶ms, len))
7825 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7826 char __user *optval,
7829 struct sctp_assoc_value params;
7830 struct sctp_association *asoc;
7831 int retval = -EFAULT;
7833 if (len < sizeof(params)) {
7838 len = sizeof(params);
7839 if (copy_from_user(¶ms, optval, len))
7842 asoc = sctp_id2assoc(sk, params.assoc_id);
7843 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7844 sctp_style(sk, UDP)) {
7849 params.assoc_value = asoc ? asoc->peer.auth_capable
7850 : sctp_sk(sk)->ep->auth_enable;
7852 if (put_user(len, optlen))
7855 if (copy_to_user(optval, ¶ms, len))
7864 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7865 char __user *optval,
7868 struct sctp_assoc_value params;
7869 struct sctp_association *asoc;
7870 int retval = -EFAULT;
7872 if (len < sizeof(params)) {
7877 len = sizeof(params);
7878 if (copy_from_user(¶ms, optval, len))
7881 asoc = sctp_id2assoc(sk, params.assoc_id);
7882 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7883 sctp_style(sk, UDP)) {
7888 params.assoc_value = asoc ? asoc->peer.ecn_capable
7889 : sctp_sk(sk)->ep->ecn_enable;
7891 if (put_user(len, optlen))
7894 if (copy_to_user(optval, ¶ms, len))
7903 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7904 char __user *optval, int __user *optlen)
7909 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7911 /* I can hardly begin to describe how wrong this is. This is
7912 * so broken as to be worse than useless. The API draft
7913 * REALLY is NOT helpful here... I am not convinced that the
7914 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7915 * are at all well-founded.
7917 if (level != SOL_SCTP) {
7918 struct sctp_af *af = sctp_sk(sk)->pf->af;
7920 retval = af->getsockopt(sk, level, optname, optval, optlen);
7924 if (get_user(len, optlen))
7934 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7936 case SCTP_DISABLE_FRAGMENTS:
7937 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7941 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7943 case SCTP_AUTOCLOSE:
7944 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7946 case SCTP_SOCKOPT_PEELOFF:
7947 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7949 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7950 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7952 case SCTP_PEER_ADDR_PARAMS:
7953 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7956 case SCTP_DELAYED_SACK:
7957 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7961 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7963 case SCTP_GET_PEER_ADDRS:
7964 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7967 case SCTP_GET_LOCAL_ADDRS:
7968 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7971 case SCTP_SOCKOPT_CONNECTX3:
7972 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7974 case SCTP_DEFAULT_SEND_PARAM:
7975 retval = sctp_getsockopt_default_send_param(sk, len,
7978 case SCTP_DEFAULT_SNDINFO:
7979 retval = sctp_getsockopt_default_sndinfo(sk, len,
7982 case SCTP_PRIMARY_ADDR:
7983 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7986 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7989 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7991 case SCTP_ASSOCINFO:
7992 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7994 case SCTP_I_WANT_MAPPED_V4_ADDR:
7995 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7998 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8000 case SCTP_GET_PEER_ADDR_INFO:
8001 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8004 case SCTP_ADAPTATION_LAYER:
8005 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8009 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8011 case SCTP_FRAGMENT_INTERLEAVE:
8012 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8015 case SCTP_PARTIAL_DELIVERY_POINT:
8016 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8019 case SCTP_MAX_BURST:
8020 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8023 case SCTP_AUTH_CHUNK:
8024 case SCTP_AUTH_DELETE_KEY:
8025 case SCTP_AUTH_DEACTIVATE_KEY:
8026 retval = -EOPNOTSUPP;
8028 case SCTP_HMAC_IDENT:
8029 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8031 case SCTP_AUTH_ACTIVE_KEY:
8032 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8034 case SCTP_PEER_AUTH_CHUNKS:
8035 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8038 case SCTP_LOCAL_AUTH_CHUNKS:
8039 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8042 case SCTP_GET_ASSOC_NUMBER:
8043 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8045 case SCTP_GET_ASSOC_ID_LIST:
8046 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8048 case SCTP_AUTO_ASCONF:
8049 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8051 case SCTP_PEER_ADDR_THLDS:
8052 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
8054 case SCTP_GET_ASSOC_STATS:
8055 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8057 case SCTP_RECVRCVINFO:
8058 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8060 case SCTP_RECVNXTINFO:
8061 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8063 case SCTP_PR_SUPPORTED:
8064 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8066 case SCTP_DEFAULT_PRINFO:
8067 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8070 case SCTP_PR_ASSOC_STATUS:
8071 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8074 case SCTP_PR_STREAM_STATUS:
8075 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8078 case SCTP_RECONFIG_SUPPORTED:
8079 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8082 case SCTP_ENABLE_STREAM_RESET:
8083 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8086 case SCTP_STREAM_SCHEDULER:
8087 retval = sctp_getsockopt_scheduler(sk, len, optval,
8090 case SCTP_STREAM_SCHEDULER_VALUE:
8091 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8094 case SCTP_INTERLEAVING_SUPPORTED:
8095 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8098 case SCTP_REUSE_PORT:
8099 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8102 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8104 case SCTP_ASCONF_SUPPORTED:
8105 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8108 case SCTP_AUTH_SUPPORTED:
8109 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8112 case SCTP_ECN_SUPPORTED:
8113 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8116 retval = -ENOPROTOOPT;
8124 static int sctp_hash(struct sock *sk)
8130 static void sctp_unhash(struct sock *sk)
8135 /* Check if port is acceptable. Possibly find first available port.
8137 * The port hash table (contained in the 'global' SCTP protocol storage
8138 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8139 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8140 * list (the list number is the port number hashed out, so as you
8141 * would expect from a hash function, all the ports in a given list have
8142 * such a number that hashes out to the same list number; you were
8143 * expecting that, right?); so each list has a set of ports, with a
8144 * link to the socket (struct sock) that uses it, the port number and
8145 * a fastreuse flag (FIXME: NPI ipg).
8147 static struct sctp_bind_bucket *sctp_bucket_create(
8148 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8150 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8152 struct sctp_sock *sp = sctp_sk(sk);
8153 bool reuse = (sk->sk_reuse || sp->reuse);
8154 struct sctp_bind_hashbucket *head; /* hash list */
8155 kuid_t uid = sock_i_uid(sk);
8156 struct sctp_bind_bucket *pp;
8157 unsigned short snum;
8160 snum = ntohs(addr->v4.sin_port);
8162 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8167 /* Search for an available port. */
8168 int low, high, remaining, index;
8170 struct net *net = sock_net(sk);
8172 inet_get_local_port_range(net, &low, &high);
8173 remaining = (high - low) + 1;
8174 rover = prandom_u32() % remaining + low;
8178 if ((rover < low) || (rover > high))
8180 if (inet_is_local_reserved_port(net, rover))
8182 index = sctp_phashfn(sock_net(sk), rover);
8183 head = &sctp_port_hashtable[index];
8184 spin_lock(&head->lock);
8185 sctp_for_each_hentry(pp, &head->chain)
8186 if ((pp->port == rover) &&
8187 net_eq(sock_net(sk), pp->net))
8191 spin_unlock(&head->lock);
8192 } while (--remaining > 0);
8194 /* Exhausted local port range during search? */
8199 /* OK, here is the one we will use. HEAD (the port
8200 * hash table list entry) is non-NULL and we hold it's
8205 /* We are given an specific port number; we verify
8206 * that it is not being used. If it is used, we will
8207 * exahust the search in the hash list corresponding
8208 * to the port number (snum) - we detect that with the
8209 * port iterator, pp being NULL.
8211 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
8212 spin_lock(&head->lock);
8213 sctp_for_each_hentry(pp, &head->chain) {
8214 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
8221 if (!hlist_empty(&pp->owner)) {
8222 /* We had a port hash table hit - there is an
8223 * available port (pp != NULL) and it is being
8224 * used by other socket (pp->owner not empty); that other
8225 * socket is going to be sk2.
8229 pr_debug("%s: found a possible match\n", __func__);
8231 if ((pp->fastreuse && reuse &&
8232 sk->sk_state != SCTP_SS_LISTENING) ||
8233 (pp->fastreuseport && sk->sk_reuseport &&
8234 uid_eq(pp->fastuid, uid)))
8237 /* Run through the list of sockets bound to the port
8238 * (pp->port) [via the pointers bind_next and
8239 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8240 * we get the endpoint they describe and run through
8241 * the endpoint's list of IP (v4 or v6) addresses,
8242 * comparing each of the addresses with the address of
8243 * the socket sk. If we find a match, then that means
8244 * that this port/socket (sk) combination are already
8247 sk_for_each_bound(sk2, &pp->owner) {
8248 struct sctp_sock *sp2 = sctp_sk(sk2);
8249 struct sctp_endpoint *ep2 = sp2->ep;
8252 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8253 sk2->sk_state != SCTP_SS_LISTENING) ||
8254 (sk->sk_reuseport && sk2->sk_reuseport &&
8255 uid_eq(uid, sock_i_uid(sk2))))
8258 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8265 pr_debug("%s: found a match\n", __func__);
8268 /* If there was a hash table miss, create a new port. */
8270 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
8273 /* In either case (hit or miss), make sure fastreuse is 1 only
8274 * if sk->sk_reuse is too (that is, if the caller requested
8275 * SO_REUSEADDR on this socket -sk-).
8277 if (hlist_empty(&pp->owner)) {
8278 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8283 if (sk->sk_reuseport) {
8284 pp->fastreuseport = 1;
8287 pp->fastreuseport = 0;
8290 if (pp->fastreuse &&
8291 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8294 if (pp->fastreuseport &&
8295 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8296 pp->fastreuseport = 0;
8299 /* We are set, so fill up all the data in the hash table
8300 * entry, tie the socket list information with the rest of the
8301 * sockets FIXME: Blurry, NPI (ipg).
8304 if (!sp->bind_hash) {
8305 inet_sk(sk)->inet_num = snum;
8306 sk_add_bind_node(sk, &pp->owner);
8312 spin_unlock(&head->lock);
8319 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8320 * port is requested.
8322 static int sctp_get_port(struct sock *sk, unsigned short snum)
8324 union sctp_addr addr;
8325 struct sctp_af *af = sctp_sk(sk)->pf->af;
8327 /* Set up a dummy address struct from the sk. */
8328 af->from_sk(&addr, sk);
8329 addr.v4.sin_port = htons(snum);
8331 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8332 return sctp_get_port_local(sk, &addr);
8336 * Move a socket to LISTENING state.
8338 static int sctp_listen_start(struct sock *sk, int backlog)
8340 struct sctp_sock *sp = sctp_sk(sk);
8341 struct sctp_endpoint *ep = sp->ep;
8342 struct crypto_shash *tfm = NULL;
8345 /* Allocate HMAC for generating cookie. */
8346 if (!sp->hmac && sp->sctp_hmac_alg) {
8347 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8348 tfm = crypto_alloc_shash(alg, 0, 0);
8350 net_info_ratelimited("failed to load transform for %s: %ld\n",
8351 sp->sctp_hmac_alg, PTR_ERR(tfm));
8354 sctp_sk(sk)->hmac = tfm;
8358 * If a bind() or sctp_bindx() is not called prior to a listen()
8359 * call that allows new associations to be accepted, the system
8360 * picks an ephemeral port and will choose an address set equivalent
8361 * to binding with a wildcard address.
8363 * This is not currently spelled out in the SCTP sockets
8364 * extensions draft, but follows the practice as seen in TCP
8368 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8369 if (!ep->base.bind_addr.port) {
8370 if (sctp_autobind(sk))
8373 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8374 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8379 sk->sk_max_ack_backlog = backlog;
8380 return sctp_hash_endpoint(ep);
8384 * 4.1.3 / 5.1.3 listen()
8386 * By default, new associations are not accepted for UDP style sockets.
8387 * An application uses listen() to mark a socket as being able to
8388 * accept new associations.
8390 * On TCP style sockets, applications use listen() to ready the SCTP
8391 * endpoint for accepting inbound associations.
8393 * On both types of endpoints a backlog of '0' disables listening.
8395 * Move a socket to LISTENING state.
8397 int sctp_inet_listen(struct socket *sock, int backlog)
8399 struct sock *sk = sock->sk;
8400 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8403 if (unlikely(backlog < 0))
8408 /* Peeled-off sockets are not allowed to listen(). */
8409 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8412 if (sock->state != SS_UNCONNECTED)
8415 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8418 /* If backlog is zero, disable listening. */
8420 if (sctp_sstate(sk, CLOSED))
8424 sctp_unhash_endpoint(ep);
8425 sk->sk_state = SCTP_SS_CLOSED;
8426 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8427 sctp_sk(sk)->bind_hash->fastreuse = 1;
8431 /* If we are already listening, just update the backlog */
8432 if (sctp_sstate(sk, LISTENING))
8433 sk->sk_max_ack_backlog = backlog;
8435 err = sctp_listen_start(sk, backlog);
8447 * This function is done by modeling the current datagram_poll() and the
8448 * tcp_poll(). Note that, based on these implementations, we don't
8449 * lock the socket in this function, even though it seems that,
8450 * ideally, locking or some other mechanisms can be used to ensure
8451 * the integrity of the counters (sndbuf and wmem_alloc) used
8452 * in this place. We assume that we don't need locks either until proven
8455 * Another thing to note is that we include the Async I/O support
8456 * here, again, by modeling the current TCP/UDP code. We don't have
8457 * a good way to test with it yet.
8459 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8461 struct sock *sk = sock->sk;
8462 struct sctp_sock *sp = sctp_sk(sk);
8465 poll_wait(file, sk_sleep(sk), wait);
8467 sock_rps_record_flow(sk);
8469 /* A TCP-style listening socket becomes readable when the accept queue
8472 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8473 return (!list_empty(&sp->ep->asocs)) ?
8474 (EPOLLIN | EPOLLRDNORM) : 0;
8478 /* Is there any exceptional events? */
8479 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
8481 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8482 if (sk->sk_shutdown & RCV_SHUTDOWN)
8483 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8484 if (sk->sk_shutdown == SHUTDOWN_MASK)
8487 /* Is it readable? Reconsider this code with TCP-style support. */
8488 if (!skb_queue_empty(&sk->sk_receive_queue))
8489 mask |= EPOLLIN | EPOLLRDNORM;
8491 /* The association is either gone or not ready. */
8492 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8495 /* Is it writable? */
8496 if (sctp_writeable(sk)) {
8497 mask |= EPOLLOUT | EPOLLWRNORM;
8499 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8501 * Since the socket is not locked, the buffer
8502 * might be made available after the writeable check and
8503 * before the bit is set. This could cause a lost I/O
8504 * signal. tcp_poll() has a race breaker for this race
8505 * condition. Based on their implementation, we put
8506 * in the following code to cover it as well.
8508 if (sctp_writeable(sk))
8509 mask |= EPOLLOUT | EPOLLWRNORM;
8514 /********************************************************************
8515 * 2nd Level Abstractions
8516 ********************************************************************/
8518 static struct sctp_bind_bucket *sctp_bucket_create(
8519 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8521 struct sctp_bind_bucket *pp;
8523 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8525 SCTP_DBG_OBJCNT_INC(bind_bucket);
8528 INIT_HLIST_HEAD(&pp->owner);
8530 hlist_add_head(&pp->node, &head->chain);
8535 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8536 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8538 if (pp && hlist_empty(&pp->owner)) {
8539 __hlist_del(&pp->node);
8540 kmem_cache_free(sctp_bucket_cachep, pp);
8541 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8545 /* Release this socket's reference to a local port. */
8546 static inline void __sctp_put_port(struct sock *sk)
8548 struct sctp_bind_hashbucket *head =
8549 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8550 inet_sk(sk)->inet_num)];
8551 struct sctp_bind_bucket *pp;
8553 spin_lock(&head->lock);
8554 pp = sctp_sk(sk)->bind_hash;
8555 __sk_del_bind_node(sk);
8556 sctp_sk(sk)->bind_hash = NULL;
8557 inet_sk(sk)->inet_num = 0;
8558 sctp_bucket_destroy(pp);
8559 spin_unlock(&head->lock);
8562 void sctp_put_port(struct sock *sk)
8565 __sctp_put_port(sk);
8570 * The system picks an ephemeral port and choose an address set equivalent
8571 * to binding with a wildcard address.
8572 * One of those addresses will be the primary address for the association.
8573 * This automatically enables the multihoming capability of SCTP.
8575 static int sctp_autobind(struct sock *sk)
8577 union sctp_addr autoaddr;
8581 /* Initialize a local sockaddr structure to INADDR_ANY. */
8582 af = sctp_sk(sk)->pf->af;
8584 port = htons(inet_sk(sk)->inet_num);
8585 af->inaddr_any(&autoaddr, port);
8587 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8590 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8593 * 4.2 The cmsghdr Structure *
8595 * When ancillary data is sent or received, any number of ancillary data
8596 * objects can be specified by the msg_control and msg_controllen members of
8597 * the msghdr structure, because each object is preceded by
8598 * a cmsghdr structure defining the object's length (the cmsg_len member).
8599 * Historically Berkeley-derived implementations have passed only one object
8600 * at a time, but this API allows multiple objects to be
8601 * passed in a single call to sendmsg() or recvmsg(). The following example
8602 * shows two ancillary data objects in a control buffer.
8604 * |<--------------------------- msg_controllen -------------------------->|
8607 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8609 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8612 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8614 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8617 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8618 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8620 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8622 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8629 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8631 struct msghdr *my_msg = (struct msghdr *)msg;
8632 struct cmsghdr *cmsg;
8634 for_each_cmsghdr(cmsg, my_msg) {
8635 if (!CMSG_OK(my_msg, cmsg))
8638 /* Should we parse this header or ignore? */
8639 if (cmsg->cmsg_level != IPPROTO_SCTP)
8642 /* Strictly check lengths following example in SCM code. */
8643 switch (cmsg->cmsg_type) {
8645 /* SCTP Socket API Extension
8646 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8648 * This cmsghdr structure provides information for
8649 * initializing new SCTP associations with sendmsg().
8650 * The SCTP_INITMSG socket option uses this same data
8651 * structure. This structure is not used for
8654 * cmsg_level cmsg_type cmsg_data[]
8655 * ------------ ------------ ----------------------
8656 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8658 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8661 cmsgs->init = CMSG_DATA(cmsg);
8665 /* SCTP Socket API Extension
8666 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8668 * This cmsghdr structure specifies SCTP options for
8669 * sendmsg() and describes SCTP header information
8670 * about a received message through recvmsg().
8672 * cmsg_level cmsg_type cmsg_data[]
8673 * ------------ ------------ ----------------------
8674 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8676 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8679 cmsgs->srinfo = CMSG_DATA(cmsg);
8681 if (cmsgs->srinfo->sinfo_flags &
8682 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8683 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8684 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8689 /* SCTP Socket API Extension
8690 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8692 * This cmsghdr structure specifies SCTP options for
8693 * sendmsg(). This structure and SCTP_RCVINFO replaces
8694 * SCTP_SNDRCV which has been deprecated.
8696 * cmsg_level cmsg_type cmsg_data[]
8697 * ------------ ------------ ---------------------
8698 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8700 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8703 cmsgs->sinfo = CMSG_DATA(cmsg);
8705 if (cmsgs->sinfo->snd_flags &
8706 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8707 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8708 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8712 /* SCTP Socket API Extension
8713 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8715 * This cmsghdr structure specifies SCTP options for sendmsg().
8717 * cmsg_level cmsg_type cmsg_data[]
8718 * ------------ ------------ ---------------------
8719 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8721 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8724 cmsgs->prinfo = CMSG_DATA(cmsg);
8725 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8728 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8729 cmsgs->prinfo->pr_value = 0;
8732 /* SCTP Socket API Extension
8733 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8735 * This cmsghdr structure specifies SCTP options for sendmsg().
8737 * cmsg_level cmsg_type cmsg_data[]
8738 * ------------ ------------ ---------------------
8739 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8741 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8744 cmsgs->authinfo = CMSG_DATA(cmsg);
8746 case SCTP_DSTADDRV4:
8747 case SCTP_DSTADDRV6:
8748 /* SCTP Socket API Extension
8749 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8751 * This cmsghdr structure specifies SCTP options for sendmsg().
8753 * cmsg_level cmsg_type cmsg_data[]
8754 * ------------ ------------ ---------------------
8755 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8756 * ------------ ------------ ---------------------
8757 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8759 cmsgs->addrs_msg = my_msg;
8770 * Wait for a packet..
8771 * Note: This function is the same function as in core/datagram.c
8772 * with a few modifications to make lksctp work.
8774 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8779 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8781 /* Socket errors? */
8782 error = sock_error(sk);
8786 if (!skb_queue_empty(&sk->sk_receive_queue))
8789 /* Socket shut down? */
8790 if (sk->sk_shutdown & RCV_SHUTDOWN)
8793 /* Sequenced packets can come disconnected. If so we report the
8798 /* Is there a good reason to think that we may receive some data? */
8799 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8802 /* Handle signals. */
8803 if (signal_pending(current))
8806 /* Let another process have a go. Since we are going to sleep
8807 * anyway. Note: This may cause odd behaviors if the message
8808 * does not fit in the user's buffer, but this seems to be the
8809 * only way to honor MSG_DONTWAIT realistically.
8812 *timeo_p = schedule_timeout(*timeo_p);
8816 finish_wait(sk_sleep(sk), &wait);
8820 error = sock_intr_errno(*timeo_p);
8823 finish_wait(sk_sleep(sk), &wait);
8828 /* Receive a datagram.
8829 * Note: This is pretty much the same routine as in core/datagram.c
8830 * with a few changes to make lksctp work.
8832 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8833 int noblock, int *err)
8836 struct sk_buff *skb;
8839 timeo = sock_rcvtimeo(sk, noblock);
8841 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8842 MAX_SCHEDULE_TIMEOUT);
8845 /* Again only user level code calls this function,
8846 * so nothing interrupt level
8847 * will suddenly eat the receive_queue.
8849 * Look at current nfs client by the way...
8850 * However, this function was correct in any case. 8)
8852 if (flags & MSG_PEEK) {
8853 skb = skb_peek(&sk->sk_receive_queue);
8855 refcount_inc(&skb->users);
8857 skb = __skb_dequeue(&sk->sk_receive_queue);
8863 /* Caller is allowed not to check sk->sk_err before calling. */
8864 error = sock_error(sk);
8868 if (sk->sk_shutdown & RCV_SHUTDOWN)
8871 if (sk_can_busy_loop(sk)) {
8872 sk_busy_loop(sk, noblock);
8874 if (!skb_queue_empty(&sk->sk_receive_queue))
8878 /* User doesn't want to wait. */
8882 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8891 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8892 static void __sctp_write_space(struct sctp_association *asoc)
8894 struct sock *sk = asoc->base.sk;
8896 if (sctp_wspace(asoc) <= 0)
8899 if (waitqueue_active(&asoc->wait))
8900 wake_up_interruptible(&asoc->wait);
8902 if (sctp_writeable(sk)) {
8903 struct socket_wq *wq;
8906 wq = rcu_dereference(sk->sk_wq);
8908 if (waitqueue_active(&wq->wait))
8909 wake_up_interruptible(&wq->wait);
8911 /* Note that we try to include the Async I/O support
8912 * here by modeling from the current TCP/UDP code.
8913 * We have not tested with it yet.
8915 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8916 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8922 static void sctp_wake_up_waiters(struct sock *sk,
8923 struct sctp_association *asoc)
8925 struct sctp_association *tmp = asoc;
8927 /* We do accounting for the sndbuf space per association,
8928 * so we only need to wake our own association.
8930 if (asoc->ep->sndbuf_policy)
8931 return __sctp_write_space(asoc);
8933 /* If association goes down and is just flushing its
8934 * outq, then just normally notify others.
8936 if (asoc->base.dead)
8937 return sctp_write_space(sk);
8939 /* Accounting for the sndbuf space is per socket, so we
8940 * need to wake up others, try to be fair and in case of
8941 * other associations, let them have a go first instead
8942 * of just doing a sctp_write_space() call.
8944 * Note that we reach sctp_wake_up_waiters() only when
8945 * associations free up queued chunks, thus we are under
8946 * lock and the list of associations on a socket is
8947 * guaranteed not to change.
8949 for (tmp = list_next_entry(tmp, asocs); 1;
8950 tmp = list_next_entry(tmp, asocs)) {
8951 /* Manually skip the head element. */
8952 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8954 /* Wake up association. */
8955 __sctp_write_space(tmp);
8956 /* We've reached the end. */
8962 /* Do accounting for the sndbuf space.
8963 * Decrement the used sndbuf space of the corresponding association by the
8964 * data size which was just transmitted(freed).
8966 static void sctp_wfree(struct sk_buff *skb)
8968 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8969 struct sctp_association *asoc = chunk->asoc;
8970 struct sock *sk = asoc->base.sk;
8972 sk_mem_uncharge(sk, skb->truesize);
8973 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8974 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8975 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8976 &sk->sk_wmem_alloc));
8979 struct sctp_shared_key *shkey = chunk->shkey;
8981 /* refcnt == 2 and !list_empty mean after this release, it's
8982 * not being used anywhere, and it's time to notify userland
8983 * that this shkey can be freed if it's been deactivated.
8985 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8986 refcount_read(&shkey->refcnt) == 2) {
8987 struct sctp_ulpevent *ev;
8989 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8993 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8995 sctp_auth_shkey_release(chunk->shkey);
8999 sctp_wake_up_waiters(sk, asoc);
9001 sctp_association_put(asoc);
9004 /* Do accounting for the receive space on the socket.
9005 * Accounting for the association is done in ulpevent.c
9006 * We set this as a destructor for the cloned data skbs so that
9007 * accounting is done at the correct time.
9009 void sctp_sock_rfree(struct sk_buff *skb)
9011 struct sock *sk = skb->sk;
9012 struct sctp_ulpevent *event = sctp_skb2event(skb);
9014 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9017 * Mimic the behavior of sock_rfree
9019 sk_mem_uncharge(sk, event->rmem_len);
9023 /* Helper function to wait for space in the sndbuf. */
9024 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9027 struct sock *sk = asoc->base.sk;
9028 long current_timeo = *timeo_p;
9032 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9035 /* Increment the association's refcnt. */
9036 sctp_association_hold(asoc);
9038 /* Wait on the association specific sndbuf space. */
9040 prepare_to_wait_exclusive(&asoc->wait, &wait,
9041 TASK_INTERRUPTIBLE);
9042 if (asoc->base.dead)
9046 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9048 if (signal_pending(current))
9049 goto do_interrupted;
9050 if (sk_under_memory_pressure(sk))
9052 if ((int)msg_len <= sctp_wspace(asoc) &&
9053 sk_wmem_schedule(sk, msg_len))
9056 /* Let another process have a go. Since we are going
9060 current_timeo = schedule_timeout(current_timeo);
9062 if (sk != asoc->base.sk)
9065 *timeo_p = current_timeo;
9069 finish_wait(&asoc->wait, &wait);
9071 /* Release the association's refcnt. */
9072 sctp_association_put(asoc);
9085 err = sock_intr_errno(*timeo_p);
9093 void sctp_data_ready(struct sock *sk)
9095 struct socket_wq *wq;
9098 wq = rcu_dereference(sk->sk_wq);
9099 if (skwq_has_sleeper(wq))
9100 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9101 EPOLLRDNORM | EPOLLRDBAND);
9102 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9106 /* If socket sndbuf has changed, wake up all per association waiters. */
9107 void sctp_write_space(struct sock *sk)
9109 struct sctp_association *asoc;
9111 /* Wake up the tasks in each wait queue. */
9112 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9113 __sctp_write_space(asoc);
9117 /* Is there any sndbuf space available on the socket?
9119 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9120 * associations on the same socket. For a UDP-style socket with
9121 * multiple associations, it is possible for it to be "unwriteable"
9122 * prematurely. I assume that this is acceptable because
9123 * a premature "unwriteable" is better than an accidental "writeable" which
9124 * would cause an unwanted block under certain circumstances. For the 1-1
9125 * UDP-style sockets or TCP-style sockets, this code should work.
9128 static bool sctp_writeable(struct sock *sk)
9130 return sk->sk_sndbuf > sk->sk_wmem_queued;
9133 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9134 * returns immediately with EINPROGRESS.
9136 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9138 struct sock *sk = asoc->base.sk;
9140 long current_timeo = *timeo_p;
9143 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9145 /* Increment the association's refcnt. */
9146 sctp_association_hold(asoc);
9149 prepare_to_wait_exclusive(&asoc->wait, &wait,
9150 TASK_INTERRUPTIBLE);
9153 if (sk->sk_shutdown & RCV_SHUTDOWN)
9155 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9158 if (signal_pending(current))
9159 goto do_interrupted;
9161 if (sctp_state(asoc, ESTABLISHED))
9164 /* Let another process have a go. Since we are going
9168 current_timeo = schedule_timeout(current_timeo);
9171 *timeo_p = current_timeo;
9175 finish_wait(&asoc->wait, &wait);
9177 /* Release the association's refcnt. */
9178 sctp_association_put(asoc);
9183 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9186 err = -ECONNREFUSED;
9190 err = sock_intr_errno(*timeo_p);
9198 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9200 struct sctp_endpoint *ep;
9204 ep = sctp_sk(sk)->ep;
9208 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9209 TASK_INTERRUPTIBLE);
9211 if (list_empty(&ep->asocs)) {
9213 timeo = schedule_timeout(timeo);
9218 if (!sctp_sstate(sk, LISTENING))
9222 if (!list_empty(&ep->asocs))
9225 err = sock_intr_errno(timeo);
9226 if (signal_pending(current))
9234 finish_wait(sk_sleep(sk), &wait);
9239 static void sctp_wait_for_close(struct sock *sk, long timeout)
9244 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9245 if (list_empty(&sctp_sk(sk)->ep->asocs))
9248 timeout = schedule_timeout(timeout);
9250 } while (!signal_pending(current) && timeout);
9252 finish_wait(sk_sleep(sk), &wait);
9255 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9257 struct sk_buff *frag;
9262 /* Don't forget the fragments. */
9263 skb_walk_frags(skb, frag)
9264 sctp_skb_set_owner_r_frag(frag, sk);
9267 sctp_skb_set_owner_r(skb, sk);
9270 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9271 struct sctp_association *asoc)
9273 struct inet_sock *inet = inet_sk(sk);
9274 struct inet_sock *newinet;
9275 struct sctp_sock *sp = sctp_sk(sk);
9276 struct sctp_endpoint *ep = sp->ep;
9278 newsk->sk_type = sk->sk_type;
9279 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9280 newsk->sk_flags = sk->sk_flags;
9281 newsk->sk_tsflags = sk->sk_tsflags;
9282 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9283 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9284 newsk->sk_reuse = sk->sk_reuse;
9285 sctp_sk(newsk)->reuse = sp->reuse;
9287 newsk->sk_shutdown = sk->sk_shutdown;
9288 newsk->sk_destruct = sctp_destruct_sock;
9289 newsk->sk_family = sk->sk_family;
9290 newsk->sk_protocol = IPPROTO_SCTP;
9291 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9292 newsk->sk_sndbuf = sk->sk_sndbuf;
9293 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9294 newsk->sk_lingertime = sk->sk_lingertime;
9295 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9296 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9297 newsk->sk_rxhash = sk->sk_rxhash;
9299 newinet = inet_sk(newsk);
9301 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9302 * getsockname() and getpeername()
9304 newinet->inet_sport = inet->inet_sport;
9305 newinet->inet_saddr = inet->inet_saddr;
9306 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9307 newinet->inet_dport = htons(asoc->peer.port);
9308 newinet->pmtudisc = inet->pmtudisc;
9309 newinet->inet_id = asoc->next_tsn ^ jiffies;
9311 newinet->uc_ttl = inet->uc_ttl;
9312 newinet->mc_loop = 1;
9313 newinet->mc_ttl = 1;
9314 newinet->mc_index = 0;
9315 newinet->mc_list = NULL;
9317 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9318 net_enable_timestamp();
9320 /* Set newsk security attributes from orginal sk and connection
9321 * security attribute from ep.
9323 security_sctp_sk_clone(ep, sk, newsk);
9326 static inline void sctp_copy_descendant(struct sock *sk_to,
9327 const struct sock *sk_from)
9329 int ancestor_size = sizeof(struct inet_sock) +
9330 sizeof(struct sctp_sock) -
9331 offsetof(struct sctp_sock, pd_lobby);
9333 if (sk_from->sk_family == PF_INET6)
9334 ancestor_size += sizeof(struct ipv6_pinfo);
9336 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9339 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9340 * and its messages to the newsk.
9342 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9343 struct sctp_association *assoc,
9344 enum sctp_socket_type type)
9346 struct sctp_sock *oldsp = sctp_sk(oldsk);
9347 struct sctp_sock *newsp = sctp_sk(newsk);
9348 struct sctp_bind_bucket *pp; /* hash list port iterator */
9349 struct sctp_endpoint *newep = newsp->ep;
9350 struct sk_buff *skb, *tmp;
9351 struct sctp_ulpevent *event;
9352 struct sctp_bind_hashbucket *head;
9355 /* Migrate socket buffer sizes and all the socket level options to the
9358 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9359 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9360 /* Brute force copy old sctp opt. */
9361 sctp_copy_descendant(newsk, oldsk);
9363 /* Restore the ep value that was overwritten with the above structure
9369 /* Hook this new socket in to the bind_hash list. */
9370 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9371 inet_sk(oldsk)->inet_num)];
9372 spin_lock_bh(&head->lock);
9373 pp = sctp_sk(oldsk)->bind_hash;
9374 sk_add_bind_node(newsk, &pp->owner);
9375 sctp_sk(newsk)->bind_hash = pp;
9376 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9377 spin_unlock_bh(&head->lock);
9379 /* Copy the bind_addr list from the original endpoint to the new
9380 * endpoint so that we can handle restarts properly
9382 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9383 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9387 /* New ep's auth_hmacs should be set if old ep's is set, in case
9388 * that net->sctp.auth_enable has been changed to 0 by users and
9389 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9391 if (oldsp->ep->auth_hmacs) {
9392 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9397 /* Move any messages in the old socket's receive queue that are for the
9398 * peeled off association to the new socket's receive queue.
9400 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9401 event = sctp_skb2event(skb);
9402 if (event->asoc == assoc) {
9403 __skb_unlink(skb, &oldsk->sk_receive_queue);
9404 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9405 sctp_skb_set_owner_r_frag(skb, newsk);
9409 /* Clean up any messages pending delivery due to partial
9410 * delivery. Three cases:
9411 * 1) No partial deliver; no work.
9412 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9413 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9415 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9417 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9418 struct sk_buff_head *queue;
9420 /* Decide which queue to move pd_lobby skbs to. */
9421 if (assoc->ulpq.pd_mode) {
9422 queue = &newsp->pd_lobby;
9424 queue = &newsk->sk_receive_queue;
9426 /* Walk through the pd_lobby, looking for skbs that
9427 * need moved to the new socket.
9429 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9430 event = sctp_skb2event(skb);
9431 if (event->asoc == assoc) {
9432 __skb_unlink(skb, &oldsp->pd_lobby);
9433 __skb_queue_tail(queue, skb);
9434 sctp_skb_set_owner_r_frag(skb, newsk);
9438 /* Clear up any skbs waiting for the partial
9439 * delivery to finish.
9441 if (assoc->ulpq.pd_mode)
9442 sctp_clear_pd(oldsk, NULL);
9446 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9448 /* Set the type of socket to indicate that it is peeled off from the
9449 * original UDP-style socket or created with the accept() call on a
9450 * TCP-style socket..
9454 /* Mark the new socket "in-use" by the user so that any packets
9455 * that may arrive on the association after we've moved it are
9456 * queued to the backlog. This prevents a potential race between
9457 * backlog processing on the old socket and new-packet processing
9458 * on the new socket.
9460 * The caller has just allocated newsk so we can guarantee that other
9461 * paths won't try to lock it and then oldsk.
9463 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9464 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9465 sctp_assoc_migrate(assoc, newsk);
9466 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9468 /* If the association on the newsk is already closed before accept()
9469 * is called, set RCV_SHUTDOWN flag.
9471 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9472 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9473 newsk->sk_shutdown |= RCV_SHUTDOWN;
9475 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9478 release_sock(newsk);
9484 /* This proto struct describes the ULP interface for SCTP. */
9485 struct proto sctp_prot = {
9487 .owner = THIS_MODULE,
9488 .close = sctp_close,
9489 .disconnect = sctp_disconnect,
9490 .accept = sctp_accept,
9491 .ioctl = sctp_ioctl,
9492 .init = sctp_init_sock,
9493 .destroy = sctp_destroy_sock,
9494 .shutdown = sctp_shutdown,
9495 .setsockopt = sctp_setsockopt,
9496 .getsockopt = sctp_getsockopt,
9497 .sendmsg = sctp_sendmsg,
9498 .recvmsg = sctp_recvmsg,
9500 .backlog_rcv = sctp_backlog_rcv,
9502 .unhash = sctp_unhash,
9503 .get_port = sctp_get_port,
9504 .obj_size = sizeof(struct sctp_sock),
9505 .useroffset = offsetof(struct sctp_sock, subscribe),
9506 .usersize = offsetof(struct sctp_sock, initmsg) -
9507 offsetof(struct sctp_sock, subscribe) +
9508 sizeof_field(struct sctp_sock, initmsg),
9509 .sysctl_mem = sysctl_sctp_mem,
9510 .sysctl_rmem = sysctl_sctp_rmem,
9511 .sysctl_wmem = sysctl_sctp_wmem,
9512 .memory_pressure = &sctp_memory_pressure,
9513 .enter_memory_pressure = sctp_enter_memory_pressure,
9514 .memory_allocated = &sctp_memory_allocated,
9515 .sockets_allocated = &sctp_sockets_allocated,
9518 #if IS_ENABLED(CONFIG_IPV6)
9520 #include <net/transp_v6.h>
9521 static void sctp_v6_destroy_sock(struct sock *sk)
9523 sctp_destroy_sock(sk);
9524 inet6_destroy_sock(sk);
9527 struct proto sctpv6_prot = {
9529 .owner = THIS_MODULE,
9530 .close = sctp_close,
9531 .disconnect = sctp_disconnect,
9532 .accept = sctp_accept,
9533 .ioctl = sctp_ioctl,
9534 .init = sctp_init_sock,
9535 .destroy = sctp_v6_destroy_sock,
9536 .shutdown = sctp_shutdown,
9537 .setsockopt = sctp_setsockopt,
9538 .getsockopt = sctp_getsockopt,
9539 .sendmsg = sctp_sendmsg,
9540 .recvmsg = sctp_recvmsg,
9542 .backlog_rcv = sctp_backlog_rcv,
9544 .unhash = sctp_unhash,
9545 .get_port = sctp_get_port,
9546 .obj_size = sizeof(struct sctp6_sock),
9547 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9548 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9549 offsetof(struct sctp6_sock, sctp.subscribe) +
9550 sizeof_field(struct sctp6_sock, sctp.initmsg),
9551 .sysctl_mem = sysctl_sctp_mem,
9552 .sysctl_rmem = sysctl_sctp_rmem,
9553 .sysctl_wmem = sysctl_sctp_wmem,
9554 .memory_pressure = &sctp_memory_pressure,
9555 .enter_memory_pressure = sctp_enter_memory_pressure,
9556 .memory_allocated = &sctp_memory_allocated,
9557 .sockets_allocated = &sctp_sockets_allocated,
9559 #endif /* IS_ENABLED(CONFIG_IPV6) */