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 && inet_port_requires_bind_service(net, snum) &&
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 (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
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, bool v2)
3948 struct sctp_paddrthlds_v2 val;
3949 struct sctp_transport *trans;
3950 struct sctp_association *asoc;
3953 len = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
3956 if (copy_from_user(&val, optval, len))
3959 if (v2 && val.spt_pathpfthld > val.spt_pathcpthld)
3962 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3963 trans = sctp_addr_id2transport(sk, &val.spt_address,
3968 if (val.spt_pathmaxrxt)
3969 trans->pathmaxrxt = val.spt_pathmaxrxt;
3971 trans->ps_retrans = val.spt_pathcpthld;
3972 trans->pf_retrans = val.spt_pathpfthld;
3977 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3978 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
3979 sctp_style(sk, UDP))
3983 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3985 if (val.spt_pathmaxrxt)
3986 trans->pathmaxrxt = val.spt_pathmaxrxt;
3988 trans->ps_retrans = val.spt_pathcpthld;
3989 trans->pf_retrans = val.spt_pathpfthld;
3992 if (val.spt_pathmaxrxt)
3993 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3995 asoc->ps_retrans = val.spt_pathcpthld;
3996 asoc->pf_retrans = val.spt_pathpfthld;
3998 struct sctp_sock *sp = sctp_sk(sk);
4000 if (val.spt_pathmaxrxt)
4001 sp->pathmaxrxt = val.spt_pathmaxrxt;
4003 sp->ps_retrans = val.spt_pathcpthld;
4004 sp->pf_retrans = val.spt_pathpfthld;
4010 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
4011 char __user *optval,
4012 unsigned int optlen)
4016 if (optlen < sizeof(int))
4018 if (get_user(val, (int __user *) optval))
4021 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4026 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4027 char __user *optval,
4028 unsigned int optlen)
4032 if (optlen < sizeof(int))
4034 if (get_user(val, (int __user *) optval))
4037 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4042 static int sctp_setsockopt_pr_supported(struct sock *sk,
4043 char __user *optval,
4044 unsigned int optlen)
4046 struct sctp_assoc_value params;
4047 struct sctp_association *asoc;
4049 if (optlen != sizeof(params))
4052 if (copy_from_user(¶ms, optval, optlen))
4055 asoc = sctp_id2assoc(sk, params.assoc_id);
4056 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4057 sctp_style(sk, UDP))
4060 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4065 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4066 char __user *optval,
4067 unsigned int optlen)
4069 struct sctp_sock *sp = sctp_sk(sk);
4070 struct sctp_default_prinfo info;
4071 struct sctp_association *asoc;
4072 int retval = -EINVAL;
4074 if (optlen != sizeof(info))
4077 if (copy_from_user(&info, optval, sizeof(info))) {
4082 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4085 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4088 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4089 if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4090 sctp_style(sk, UDP))
4096 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4097 asoc->default_timetolive = info.pr_value;
4101 if (sctp_style(sk, TCP))
4102 info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4104 if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4105 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4106 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4107 sp->default_timetolive = info.pr_value;
4110 if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4111 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4112 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4113 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4114 asoc->default_timetolive = info.pr_value;
4122 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4123 char __user *optval,
4124 unsigned int optlen)
4126 struct sctp_assoc_value params;
4127 struct sctp_association *asoc;
4128 int retval = -EINVAL;
4130 if (optlen != sizeof(params))
4133 if (copy_from_user(¶ms, optval, optlen)) {
4138 asoc = sctp_id2assoc(sk, params.assoc_id);
4139 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4140 sctp_style(sk, UDP))
4143 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4151 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4152 char __user *optval,
4153 unsigned int optlen)
4155 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4156 struct sctp_assoc_value params;
4157 struct sctp_association *asoc;
4158 int retval = -EINVAL;
4160 if (optlen != sizeof(params))
4163 if (copy_from_user(¶ms, optval, optlen)) {
4168 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4171 asoc = sctp_id2assoc(sk, params.assoc_id);
4172 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4173 sctp_style(sk, UDP))
4179 asoc->strreset_enable = params.assoc_value;
4183 if (sctp_style(sk, TCP))
4184 params.assoc_id = SCTP_FUTURE_ASSOC;
4186 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4187 params.assoc_id == SCTP_ALL_ASSOC)
4188 ep->strreset_enable = params.assoc_value;
4190 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4191 params.assoc_id == SCTP_ALL_ASSOC)
4192 list_for_each_entry(asoc, &ep->asocs, asocs)
4193 asoc->strreset_enable = params.assoc_value;
4199 static int sctp_setsockopt_reset_streams(struct sock *sk,
4200 char __user *optval,
4201 unsigned int optlen)
4203 struct sctp_reset_streams *params;
4204 struct sctp_association *asoc;
4205 int retval = -EINVAL;
4207 if (optlen < sizeof(*params))
4209 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4210 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4211 sizeof(__u16) * sizeof(*params));
4213 params = memdup_user(optval, optlen);
4215 return PTR_ERR(params);
4217 if (params->srs_number_streams * sizeof(__u16) >
4218 optlen - sizeof(*params))
4221 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4225 retval = sctp_send_reset_streams(asoc, params);
4232 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4233 char __user *optval,
4234 unsigned int optlen)
4236 struct sctp_association *asoc;
4237 sctp_assoc_t associd;
4238 int retval = -EINVAL;
4240 if (optlen != sizeof(associd))
4243 if (copy_from_user(&associd, optval, optlen)) {
4248 asoc = sctp_id2assoc(sk, associd);
4252 retval = sctp_send_reset_assoc(asoc);
4258 static int sctp_setsockopt_add_streams(struct sock *sk,
4259 char __user *optval,
4260 unsigned int optlen)
4262 struct sctp_association *asoc;
4263 struct sctp_add_streams params;
4264 int retval = -EINVAL;
4266 if (optlen != sizeof(params))
4269 if (copy_from_user(¶ms, optval, optlen)) {
4274 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4278 retval = sctp_send_add_streams(asoc, ¶ms);
4284 static int sctp_setsockopt_scheduler(struct sock *sk,
4285 char __user *optval,
4286 unsigned int optlen)
4288 struct sctp_sock *sp = sctp_sk(sk);
4289 struct sctp_association *asoc;
4290 struct sctp_assoc_value params;
4293 if (optlen < sizeof(params))
4296 optlen = sizeof(params);
4297 if (copy_from_user(¶ms, optval, optlen))
4300 if (params.assoc_value > SCTP_SS_MAX)
4303 asoc = sctp_id2assoc(sk, params.assoc_id);
4304 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4305 sctp_style(sk, UDP))
4309 return sctp_sched_set_sched(asoc, params.assoc_value);
4311 if (sctp_style(sk, TCP))
4312 params.assoc_id = SCTP_FUTURE_ASSOC;
4314 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4315 params.assoc_id == SCTP_ALL_ASSOC)
4316 sp->default_ss = params.assoc_value;
4318 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4319 params.assoc_id == SCTP_ALL_ASSOC) {
4320 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4321 int ret = sctp_sched_set_sched(asoc,
4322 params.assoc_value);
4332 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4333 char __user *optval,
4334 unsigned int optlen)
4336 struct sctp_stream_value params;
4337 struct sctp_association *asoc;
4338 int retval = -EINVAL;
4340 if (optlen < sizeof(params))
4343 optlen = sizeof(params);
4344 if (copy_from_user(¶ms, optval, optlen)) {
4349 asoc = sctp_id2assoc(sk, params.assoc_id);
4350 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4351 sctp_style(sk, UDP))
4355 retval = sctp_sched_set_value(asoc, params.stream_id,
4356 params.stream_value, GFP_KERNEL);
4362 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4363 int ret = sctp_sched_set_value(asoc, params.stream_id,
4364 params.stream_value, GFP_KERNEL);
4365 if (ret && !retval) /* try to return the 1st error. */
4373 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4374 char __user *optval,
4375 unsigned int optlen)
4377 struct sctp_sock *sp = sctp_sk(sk);
4378 struct sctp_assoc_value params;
4379 struct sctp_association *asoc;
4380 int retval = -EINVAL;
4382 if (optlen < sizeof(params))
4385 optlen = sizeof(params);
4386 if (copy_from_user(¶ms, optval, optlen)) {
4391 asoc = sctp_id2assoc(sk, params.assoc_id);
4392 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4393 sctp_style(sk, UDP))
4396 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4401 sp->ep->intl_enable = !!params.assoc_value;
4409 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4410 unsigned int optlen)
4414 if (!sctp_style(sk, TCP))
4417 if (sctp_sk(sk)->ep->base.bind_addr.port)
4420 if (optlen < sizeof(int))
4423 if (get_user(val, (int __user *)optval))
4426 sctp_sk(sk)->reuse = !!val;
4431 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4432 struct sctp_association *asoc)
4434 struct sctp_ulpevent *event;
4436 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4438 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4439 if (sctp_outq_is_empty(&asoc->outqueue)) {
4440 event = sctp_ulpevent_make_sender_dry_event(asoc,
4441 GFP_USER | __GFP_NOWARN);
4445 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4452 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4453 unsigned int optlen)
4455 struct sctp_sock *sp = sctp_sk(sk);
4456 struct sctp_association *asoc;
4457 struct sctp_event param;
4460 if (optlen < sizeof(param))
4463 optlen = sizeof(param);
4464 if (copy_from_user(¶m, optval, optlen))
4467 if (param.se_type < SCTP_SN_TYPE_BASE ||
4468 param.se_type > SCTP_SN_TYPE_MAX)
4471 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4472 if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4473 sctp_style(sk, UDP))
4477 return sctp_assoc_ulpevent_type_set(¶m, asoc);
4479 if (sctp_style(sk, TCP))
4480 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4482 if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4483 param.se_assoc_id == SCTP_ALL_ASSOC)
4484 sctp_ulpevent_type_set(&sp->subscribe,
4485 param.se_type, param.se_on);
4487 if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4488 param.se_assoc_id == SCTP_ALL_ASSOC) {
4489 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4490 int ret = sctp_assoc_ulpevent_type_set(¶m, asoc);
4500 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4501 char __user *optval,
4502 unsigned int optlen)
4504 struct sctp_assoc_value params;
4505 struct sctp_association *asoc;
4506 struct sctp_endpoint *ep;
4507 int retval = -EINVAL;
4509 if (optlen != sizeof(params))
4512 if (copy_from_user(¶ms, optval, optlen)) {
4517 asoc = sctp_id2assoc(sk, params.assoc_id);
4518 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4519 sctp_style(sk, UDP))
4522 ep = sctp_sk(sk)->ep;
4523 ep->asconf_enable = !!params.assoc_value;
4525 if (ep->asconf_enable && ep->auth_enable) {
4526 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4527 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4536 static int sctp_setsockopt_auth_supported(struct sock *sk,
4537 char __user *optval,
4538 unsigned int optlen)
4540 struct sctp_assoc_value params;
4541 struct sctp_association *asoc;
4542 struct sctp_endpoint *ep;
4543 int retval = -EINVAL;
4545 if (optlen != sizeof(params))
4548 if (copy_from_user(¶ms, optval, optlen)) {
4553 asoc = sctp_id2assoc(sk, params.assoc_id);
4554 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4555 sctp_style(sk, UDP))
4558 ep = sctp_sk(sk)->ep;
4559 if (params.assoc_value) {
4560 retval = sctp_auth_init(ep, GFP_KERNEL);
4563 if (ep->asconf_enable) {
4564 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4565 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4569 ep->auth_enable = !!params.assoc_value;
4576 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4577 char __user *optval,
4578 unsigned int optlen)
4580 struct sctp_assoc_value params;
4581 struct sctp_association *asoc;
4582 int retval = -EINVAL;
4584 if (optlen != sizeof(params))
4587 if (copy_from_user(¶ms, optval, optlen)) {
4592 asoc = sctp_id2assoc(sk, params.assoc_id);
4593 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4594 sctp_style(sk, UDP))
4597 sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
4604 static int sctp_setsockopt_pf_expose(struct sock *sk,
4605 char __user *optval,
4606 unsigned int optlen)
4608 struct sctp_assoc_value params;
4609 struct sctp_association *asoc;
4610 int retval = -EINVAL;
4612 if (optlen != sizeof(params))
4615 if (copy_from_user(¶ms, optval, optlen)) {
4620 if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
4623 asoc = sctp_id2assoc(sk, params.assoc_id);
4624 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4625 sctp_style(sk, UDP))
4629 asoc->pf_expose = params.assoc_value;
4631 sctp_sk(sk)->pf_expose = params.assoc_value;
4638 /* API 6.2 setsockopt(), getsockopt()
4640 * Applications use setsockopt() and getsockopt() to set or retrieve
4641 * socket options. Socket options are used to change the default
4642 * behavior of sockets calls. They are described in Section 7.
4646 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4647 * int __user *optlen);
4648 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4651 * sd - the socket descript.
4652 * level - set to IPPROTO_SCTP for all SCTP options.
4653 * optname - the option name.
4654 * optval - the buffer to store the value of the option.
4655 * optlen - the size of the buffer.
4657 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4658 char __user *optval, unsigned int optlen)
4662 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4664 /* I can hardly begin to describe how wrong this is. This is
4665 * so broken as to be worse than useless. The API draft
4666 * REALLY is NOT helpful here... I am not convinced that the
4667 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4668 * are at all well-founded.
4670 if (level != SOL_SCTP) {
4671 struct sctp_af *af = sctp_sk(sk)->pf->af;
4672 retval = af->setsockopt(sk, level, optname, optval, optlen);
4679 case SCTP_SOCKOPT_BINDX_ADD:
4680 /* 'optlen' is the size of the addresses buffer. */
4681 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4682 optlen, SCTP_BINDX_ADD_ADDR);
4685 case SCTP_SOCKOPT_BINDX_REM:
4686 /* 'optlen' is the size of the addresses buffer. */
4687 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4688 optlen, SCTP_BINDX_REM_ADDR);
4691 case SCTP_SOCKOPT_CONNECTX_OLD:
4692 /* 'optlen' is the size of the addresses buffer. */
4693 retval = sctp_setsockopt_connectx_old(sk,
4694 (struct sockaddr __user *)optval,
4698 case SCTP_SOCKOPT_CONNECTX:
4699 /* 'optlen' is the size of the addresses buffer. */
4700 retval = sctp_setsockopt_connectx(sk,
4701 (struct sockaddr __user *)optval,
4705 case SCTP_DISABLE_FRAGMENTS:
4706 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4710 retval = sctp_setsockopt_events(sk, optval, optlen);
4713 case SCTP_AUTOCLOSE:
4714 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4717 case SCTP_PEER_ADDR_PARAMS:
4718 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4721 case SCTP_DELAYED_SACK:
4722 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4724 case SCTP_PARTIAL_DELIVERY_POINT:
4725 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4729 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4731 case SCTP_DEFAULT_SEND_PARAM:
4732 retval = sctp_setsockopt_default_send_param(sk, optval,
4735 case SCTP_DEFAULT_SNDINFO:
4736 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4738 case SCTP_PRIMARY_ADDR:
4739 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4741 case SCTP_SET_PEER_PRIMARY_ADDR:
4742 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4745 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4748 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4750 case SCTP_ASSOCINFO:
4751 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4753 case SCTP_I_WANT_MAPPED_V4_ADDR:
4754 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4757 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4759 case SCTP_ADAPTATION_LAYER:
4760 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4763 retval = sctp_setsockopt_context(sk, optval, optlen);
4765 case SCTP_FRAGMENT_INTERLEAVE:
4766 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4768 case SCTP_MAX_BURST:
4769 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4771 case SCTP_AUTH_CHUNK:
4772 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4774 case SCTP_HMAC_IDENT:
4775 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4778 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4780 case SCTP_AUTH_ACTIVE_KEY:
4781 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4783 case SCTP_AUTH_DELETE_KEY:
4784 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4786 case SCTP_AUTH_DEACTIVATE_KEY:
4787 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4789 case SCTP_AUTO_ASCONF:
4790 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4792 case SCTP_PEER_ADDR_THLDS:
4793 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen,
4796 case SCTP_PEER_ADDR_THLDS_V2:
4797 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen,
4800 case SCTP_RECVRCVINFO:
4801 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4803 case SCTP_RECVNXTINFO:
4804 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4806 case SCTP_PR_SUPPORTED:
4807 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4809 case SCTP_DEFAULT_PRINFO:
4810 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4812 case SCTP_RECONFIG_SUPPORTED:
4813 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4815 case SCTP_ENABLE_STREAM_RESET:
4816 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4818 case SCTP_RESET_STREAMS:
4819 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4821 case SCTP_RESET_ASSOC:
4822 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4824 case SCTP_ADD_STREAMS:
4825 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4827 case SCTP_STREAM_SCHEDULER:
4828 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4830 case SCTP_STREAM_SCHEDULER_VALUE:
4831 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4833 case SCTP_INTERLEAVING_SUPPORTED:
4834 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4837 case SCTP_REUSE_PORT:
4838 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4841 retval = sctp_setsockopt_event(sk, optval, optlen);
4843 case SCTP_ASCONF_SUPPORTED:
4844 retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
4846 case SCTP_AUTH_SUPPORTED:
4847 retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
4849 case SCTP_ECN_SUPPORTED:
4850 retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
4852 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4853 retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
4856 retval = -ENOPROTOOPT;
4866 /* API 3.1.6 connect() - UDP Style Syntax
4868 * An application may use the connect() call in the UDP model to initiate an
4869 * association without sending data.
4873 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4875 * sd: the socket descriptor to have a new association added to.
4877 * nam: the address structure (either struct sockaddr_in or struct
4878 * sockaddr_in6 defined in RFC2553 [7]).
4880 * len: the size of the address.
4882 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4883 int addr_len, int flags)
4889 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4892 /* Validate addr_len before calling common connect/connectx routine. */
4893 af = sctp_get_af_specific(addr->sa_family);
4894 if (af && addr_len >= af->sockaddr_len)
4895 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4901 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4902 int addr_len, int flags)
4904 if (addr_len < sizeof(uaddr->sa_family))
4907 if (uaddr->sa_family == AF_UNSPEC)
4910 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4913 /* FIXME: Write comments. */
4914 static int sctp_disconnect(struct sock *sk, int flags)
4916 return -EOPNOTSUPP; /* STUB */
4919 /* 4.1.4 accept() - TCP Style Syntax
4921 * Applications use accept() call to remove an established SCTP
4922 * association from the accept queue of the endpoint. A new socket
4923 * descriptor will be returned from accept() to represent the newly
4924 * formed association.
4926 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4928 struct sctp_sock *sp;
4929 struct sctp_endpoint *ep;
4930 struct sock *newsk = NULL;
4931 struct sctp_association *asoc;
4940 if (!sctp_style(sk, TCP)) {
4941 error = -EOPNOTSUPP;
4945 if (!sctp_sstate(sk, LISTENING)) {
4950 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4952 error = sctp_wait_for_accept(sk, timeo);
4956 /* We treat the list of associations on the endpoint as the accept
4957 * queue and pick the first association on the list.
4959 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4961 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4967 /* Populate the fields of the newsk from the oldsk and migrate the
4968 * asoc to the newsk.
4970 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4972 sk_common_release(newsk);
4982 /* The SCTP ioctl handler. */
4983 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4990 * SEQPACKET-style sockets in LISTENING state are valid, for
4991 * SCTP, so only discard TCP-style sockets in LISTENING state.
4993 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4998 struct sk_buff *skb;
4999 unsigned int amount = 0;
5001 skb = skb_peek(&sk->sk_receive_queue);
5004 * We will only return the amount of this packet since
5005 * that is all that will be read.
5009 rc = put_user(amount, (int __user *)arg);
5021 /* This is the function which gets called during socket creation to
5022 * initialized the SCTP-specific portion of the sock.
5023 * The sock structure should already be zero-filled memory.
5025 static int sctp_init_sock(struct sock *sk)
5027 struct net *net = sock_net(sk);
5028 struct sctp_sock *sp;
5030 pr_debug("%s: sk:%p\n", __func__, sk);
5034 /* Initialize the SCTP per socket area. */
5035 switch (sk->sk_type) {
5036 case SOCK_SEQPACKET:
5037 sp->type = SCTP_SOCKET_UDP;
5040 sp->type = SCTP_SOCKET_TCP;
5043 return -ESOCKTNOSUPPORT;
5046 sk->sk_gso_type = SKB_GSO_SCTP;
5048 /* Initialize default send parameters. These parameters can be
5049 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
5051 sp->default_stream = 0;
5052 sp->default_ppid = 0;
5053 sp->default_flags = 0;
5054 sp->default_context = 0;
5055 sp->default_timetolive = 0;
5057 sp->default_rcv_context = 0;
5058 sp->max_burst = net->sctp.max_burst;
5060 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5062 /* Initialize default setup parameters. These parameters
5063 * can be modified with the SCTP_INITMSG socket option or
5064 * overridden by the SCTP_INIT CMSG.
5066 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
5067 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
5068 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
5069 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5071 /* Initialize default RTO related parameters. These parameters can
5072 * be modified for with the SCTP_RTOINFO socket option.
5074 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5075 sp->rtoinfo.srto_max = net->sctp.rto_max;
5076 sp->rtoinfo.srto_min = net->sctp.rto_min;
5078 /* Initialize default association related parameters. These parameters
5079 * can be modified with the SCTP_ASSOCINFO socket option.
5081 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5082 sp->assocparams.sasoc_number_peer_destinations = 0;
5083 sp->assocparams.sasoc_peer_rwnd = 0;
5084 sp->assocparams.sasoc_local_rwnd = 0;
5085 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5087 /* Initialize default event subscriptions. By default, all the
5092 /* Default Peer Address Parameters. These defaults can
5093 * be modified via SCTP_PEER_ADDR_PARAMS
5095 sp->hbinterval = net->sctp.hb_interval;
5096 sp->pathmaxrxt = net->sctp.max_retrans_path;
5097 sp->pf_retrans = net->sctp.pf_retrans;
5098 sp->ps_retrans = net->sctp.ps_retrans;
5099 sp->pf_expose = net->sctp.pf_expose;
5100 sp->pathmtu = 0; /* allow default discovery */
5101 sp->sackdelay = net->sctp.sack_timeout;
5103 sp->param_flags = SPP_HB_ENABLE |
5105 SPP_SACKDELAY_ENABLE;
5106 sp->default_ss = SCTP_SS_DEFAULT;
5108 /* If enabled no SCTP message fragmentation will be performed.
5109 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5111 sp->disable_fragments = 0;
5113 /* Enable Nagle algorithm by default. */
5116 sp->recvrcvinfo = 0;
5117 sp->recvnxtinfo = 0;
5119 /* Enable by default. */
5122 /* Auto-close idle associations after the configured
5123 * number of seconds. A value of 0 disables this
5124 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5125 * for UDP-style sockets only.
5129 /* User specified fragmentation limit. */
5132 sp->adaptation_ind = 0;
5134 sp->pf = sctp_get_pf_specific(sk->sk_family);
5136 /* Control variables for partial data delivery. */
5137 atomic_set(&sp->pd_mode, 0);
5138 skb_queue_head_init(&sp->pd_lobby);
5139 sp->frag_interleave = 0;
5141 /* Create a per socket endpoint structure. Even if we
5142 * change the data structure relationships, this may still
5143 * be useful for storing pre-connect address information.
5145 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5151 sk->sk_destruct = sctp_destruct_sock;
5153 SCTP_DBG_OBJCNT_INC(sock);
5156 sk_sockets_allocated_inc(sk);
5157 sock_prot_inuse_add(net, sk->sk_prot, 1);
5159 /* Nothing can fail after this block, otherwise
5160 * sctp_destroy_sock() will be called without addr_wq_lock held
5162 if (net->sctp.default_auto_asconf) {
5163 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5164 list_add_tail(&sp->auto_asconf_list,
5165 &net->sctp.auto_asconf_splist);
5166 sp->do_auto_asconf = 1;
5167 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5169 sp->do_auto_asconf = 0;
5177 /* Cleanup any SCTP per socket resources. Must be called with
5178 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5180 static void sctp_destroy_sock(struct sock *sk)
5182 struct sctp_sock *sp;
5184 pr_debug("%s: sk:%p\n", __func__, sk);
5186 /* Release our hold on the endpoint. */
5188 /* This could happen during socket init, thus we bail out
5189 * early, since the rest of the below is not setup either.
5194 if (sp->do_auto_asconf) {
5195 sp->do_auto_asconf = 0;
5196 list_del(&sp->auto_asconf_list);
5198 sctp_endpoint_free(sp->ep);
5200 sk_sockets_allocated_dec(sk);
5201 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5205 /* Triggered when there are no references on the socket anymore */
5206 static void sctp_destruct_sock(struct sock *sk)
5208 struct sctp_sock *sp = sctp_sk(sk);
5210 /* Free up the HMAC transform. */
5211 crypto_free_shash(sp->hmac);
5213 inet_sock_destruct(sk);
5216 /* API 4.1.7 shutdown() - TCP Style Syntax
5217 * int shutdown(int socket, int how);
5219 * sd - the socket descriptor of the association to be closed.
5220 * how - Specifies the type of shutdown. The values are
5223 * Disables further receive operations. No SCTP
5224 * protocol action is taken.
5226 * Disables further send operations, and initiates
5227 * the SCTP shutdown sequence.
5229 * Disables further send and receive operations
5230 * and initiates the SCTP shutdown sequence.
5232 static void sctp_shutdown(struct sock *sk, int how)
5234 struct net *net = sock_net(sk);
5235 struct sctp_endpoint *ep;
5237 if (!sctp_style(sk, TCP))
5240 ep = sctp_sk(sk)->ep;
5241 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5242 struct sctp_association *asoc;
5244 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5245 asoc = list_entry(ep->asocs.next,
5246 struct sctp_association, asocs);
5247 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5251 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5252 struct sctp_info *info)
5254 struct sctp_transport *prim;
5255 struct list_head *pos;
5258 memset(info, 0, sizeof(*info));
5260 struct sctp_sock *sp = sctp_sk(sk);
5262 info->sctpi_s_autoclose = sp->autoclose;
5263 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5264 info->sctpi_s_pd_point = sp->pd_point;
5265 info->sctpi_s_nodelay = sp->nodelay;
5266 info->sctpi_s_disable_fragments = sp->disable_fragments;
5267 info->sctpi_s_v4mapped = sp->v4mapped;
5268 info->sctpi_s_frag_interleave = sp->frag_interleave;
5269 info->sctpi_s_type = sp->type;
5274 info->sctpi_tag = asoc->c.my_vtag;
5275 info->sctpi_state = asoc->state;
5276 info->sctpi_rwnd = asoc->a_rwnd;
5277 info->sctpi_unackdata = asoc->unack_data;
5278 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5279 info->sctpi_instrms = asoc->stream.incnt;
5280 info->sctpi_outstrms = asoc->stream.outcnt;
5281 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5282 info->sctpi_inqueue++;
5283 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5284 info->sctpi_outqueue++;
5285 info->sctpi_overall_error = asoc->overall_error_count;
5286 info->sctpi_max_burst = asoc->max_burst;
5287 info->sctpi_maxseg = asoc->frag_point;
5288 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5289 info->sctpi_peer_tag = asoc->c.peer_vtag;
5291 mask = asoc->peer.ecn_capable << 1;
5292 mask = (mask | asoc->peer.ipv4_address) << 1;
5293 mask = (mask | asoc->peer.ipv6_address) << 1;
5294 mask = (mask | asoc->peer.hostname_address) << 1;
5295 mask = (mask | asoc->peer.asconf_capable) << 1;
5296 mask = (mask | asoc->peer.prsctp_capable) << 1;
5297 mask = (mask | asoc->peer.auth_capable);
5298 info->sctpi_peer_capable = mask;
5299 mask = asoc->peer.sack_needed << 1;
5300 mask = (mask | asoc->peer.sack_generation) << 1;
5301 mask = (mask | asoc->peer.zero_window_announced);
5302 info->sctpi_peer_sack = mask;
5304 info->sctpi_isacks = asoc->stats.isacks;
5305 info->sctpi_osacks = asoc->stats.osacks;
5306 info->sctpi_opackets = asoc->stats.opackets;
5307 info->sctpi_ipackets = asoc->stats.ipackets;
5308 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5309 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5310 info->sctpi_idupchunks = asoc->stats.idupchunks;
5311 info->sctpi_gapcnt = asoc->stats.gapcnt;
5312 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5313 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5314 info->sctpi_oodchunks = asoc->stats.oodchunks;
5315 info->sctpi_iodchunks = asoc->stats.iodchunks;
5316 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5317 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5319 prim = asoc->peer.primary_path;
5320 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5321 info->sctpi_p_state = prim->state;
5322 info->sctpi_p_cwnd = prim->cwnd;
5323 info->sctpi_p_srtt = prim->srtt;
5324 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5325 info->sctpi_p_hbinterval = prim->hbinterval;
5326 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5327 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5328 info->sctpi_p_ssthresh = prim->ssthresh;
5329 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5330 info->sctpi_p_flight_size = prim->flight_size;
5331 info->sctpi_p_error = prim->error_count;
5335 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5337 /* use callback to avoid exporting the core structure */
5338 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5340 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5342 rhashtable_walk_start(iter);
5345 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5347 rhashtable_walk_stop(iter);
5348 rhashtable_walk_exit(iter);
5351 struct sctp_transport *sctp_transport_get_next(struct net *net,
5352 struct rhashtable_iter *iter)
5354 struct sctp_transport *t;
5356 t = rhashtable_walk_next(iter);
5357 for (; t; t = rhashtable_walk_next(iter)) {
5359 if (PTR_ERR(t) == -EAGAIN)
5364 if (!sctp_transport_hold(t))
5367 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5368 t->asoc->peer.primary_path == t)
5371 sctp_transport_put(t);
5377 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5378 struct rhashtable_iter *iter,
5381 struct sctp_transport *t;
5384 return SEQ_START_TOKEN;
5386 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5389 sctp_transport_put(t);
5395 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5399 struct sctp_ep_common *epb;
5400 struct sctp_hashbucket *head;
5402 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5404 read_lock_bh(&head->lock);
5405 sctp_for_each_hentry(epb, &head->chain) {
5406 err = cb(sctp_ep(epb), p);
5410 read_unlock_bh(&head->lock);
5415 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5417 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5419 const union sctp_addr *laddr,
5420 const union sctp_addr *paddr, void *p)
5422 struct sctp_transport *transport;
5426 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5431 err = cb(transport, p);
5432 sctp_transport_put(transport);
5436 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5438 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5439 int (*cb_done)(struct sctp_transport *, void *),
5440 struct net *net, int *pos, void *p) {
5441 struct rhashtable_iter hti;
5442 struct sctp_transport *tsp;
5447 sctp_transport_walk_start(&hti);
5449 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5450 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5455 sctp_transport_put(tsp);
5457 sctp_transport_walk_stop(&hti);
5460 if (cb_done && !cb_done(tsp, p)) {
5462 sctp_transport_put(tsp);
5465 sctp_transport_put(tsp);
5470 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5472 /* 7.2.1 Association Status (SCTP_STATUS)
5474 * Applications can retrieve current status information about an
5475 * association, including association state, peer receiver window size,
5476 * number of unacked data chunks, and number of data chunks pending
5477 * receipt. This information is read-only.
5479 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5480 char __user *optval,
5483 struct sctp_status status;
5484 struct sctp_association *asoc = NULL;
5485 struct sctp_transport *transport;
5486 sctp_assoc_t associd;
5489 if (len < sizeof(status)) {
5494 len = sizeof(status);
5495 if (copy_from_user(&status, optval, len)) {
5500 associd = status.sstat_assoc_id;
5501 asoc = sctp_id2assoc(sk, associd);
5507 transport = asoc->peer.primary_path;
5509 status.sstat_assoc_id = sctp_assoc2id(asoc);
5510 status.sstat_state = sctp_assoc_to_state(asoc);
5511 status.sstat_rwnd = asoc->peer.rwnd;
5512 status.sstat_unackdata = asoc->unack_data;
5514 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5515 status.sstat_instrms = asoc->stream.incnt;
5516 status.sstat_outstrms = asoc->stream.outcnt;
5517 status.sstat_fragmentation_point = asoc->frag_point;
5518 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5519 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5520 transport->af_specific->sockaddr_len);
5521 /* Map ipv4 address into v4-mapped-on-v6 address. */
5522 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5523 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5524 status.sstat_primary.spinfo_state = transport->state;
5525 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5526 status.sstat_primary.spinfo_srtt = transport->srtt;
5527 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5528 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5530 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5531 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5533 if (put_user(len, optlen)) {
5538 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5539 __func__, len, status.sstat_state, status.sstat_rwnd,
5540 status.sstat_assoc_id);
5542 if (copy_to_user(optval, &status, len)) {
5552 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5554 * Applications can retrieve information about a specific peer address
5555 * of an association, including its reachability state, congestion
5556 * window, and retransmission timer values. This information is
5559 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5560 char __user *optval,
5563 struct sctp_paddrinfo pinfo;
5564 struct sctp_transport *transport;
5567 if (len < sizeof(pinfo)) {
5572 len = sizeof(pinfo);
5573 if (copy_from_user(&pinfo, optval, len)) {
5578 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5579 pinfo.spinfo_assoc_id);
5585 if (transport->state == SCTP_PF &&
5586 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5591 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5592 pinfo.spinfo_state = transport->state;
5593 pinfo.spinfo_cwnd = transport->cwnd;
5594 pinfo.spinfo_srtt = transport->srtt;
5595 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5596 pinfo.spinfo_mtu = transport->pathmtu;
5598 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5599 pinfo.spinfo_state = SCTP_ACTIVE;
5601 if (put_user(len, optlen)) {
5606 if (copy_to_user(optval, &pinfo, len)) {
5615 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5617 * This option is a on/off flag. If enabled no SCTP message
5618 * fragmentation will be performed. Instead if a message being sent
5619 * exceeds the current PMTU size, the message will NOT be sent and
5620 * instead a error will be indicated to the user.
5622 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5623 char __user *optval, int __user *optlen)
5627 if (len < sizeof(int))
5631 val = (sctp_sk(sk)->disable_fragments == 1);
5632 if (put_user(len, optlen))
5634 if (copy_to_user(optval, &val, len))
5639 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5641 * This socket option is used to specify various notifications and
5642 * ancillary data the user wishes to receive.
5644 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5647 struct sctp_event_subscribe subscribe;
5648 __u8 *sn_type = (__u8 *)&subscribe;
5653 if (len > sizeof(struct sctp_event_subscribe))
5654 len = sizeof(struct sctp_event_subscribe);
5655 if (put_user(len, optlen))
5658 for (i = 0; i < len; i++)
5659 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5660 SCTP_SN_TYPE_BASE + i);
5662 if (copy_to_user(optval, &subscribe, len))
5668 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5670 * This socket option is applicable to the UDP-style socket only. When
5671 * set it will cause associations that are idle for more than the
5672 * specified number of seconds to automatically close. An association
5673 * being idle is defined an association that has NOT sent or received
5674 * user data. The special value of '0' indicates that no automatic
5675 * close of any associations should be performed. The option expects an
5676 * integer defining the number of seconds of idle time before an
5677 * association is closed.
5679 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5681 /* Applicable to UDP-style socket only */
5682 if (sctp_style(sk, TCP))
5684 if (len < sizeof(int))
5687 if (put_user(len, optlen))
5689 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5694 /* Helper routine to branch off an association to a new socket. */
5695 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5697 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5698 struct sctp_sock *sp = sctp_sk(sk);
5699 struct socket *sock;
5702 /* Do not peel off from one netns to another one. */
5703 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5709 /* An association cannot be branched off from an already peeled-off
5710 * socket, nor is this supported for tcp style sockets.
5712 if (!sctp_style(sk, UDP))
5715 /* Create a new socket. */
5716 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5720 sctp_copy_sock(sock->sk, sk, asoc);
5722 /* Make peeled-off sockets more like 1-1 accepted sockets.
5723 * Set the daddr and initialize id to something more random and also
5724 * copy over any ip options.
5726 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5727 sp->pf->copy_ip_options(sk, sock->sk);
5729 /* Populate the fields of the newsk from the oldsk and migrate the
5730 * asoc to the newsk.
5732 err = sctp_sock_migrate(sk, sock->sk, asoc,
5733 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5743 EXPORT_SYMBOL(sctp_do_peeloff);
5745 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5746 struct file **newfile, unsigned flags)
5748 struct socket *newsock;
5751 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5755 /* Map the socket to an unused fd that can be returned to the user. */
5756 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5758 sock_release(newsock);
5762 *newfile = sock_alloc_file(newsock, 0, NULL);
5763 if (IS_ERR(*newfile)) {
5764 put_unused_fd(retval);
5765 retval = PTR_ERR(*newfile);
5770 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5773 peeloff->sd = retval;
5775 if (flags & SOCK_NONBLOCK)
5776 (*newfile)->f_flags |= O_NONBLOCK;
5781 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5783 sctp_peeloff_arg_t peeloff;
5784 struct file *newfile = NULL;
5787 if (len < sizeof(sctp_peeloff_arg_t))
5789 len = sizeof(sctp_peeloff_arg_t);
5790 if (copy_from_user(&peeloff, optval, len))
5793 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5797 /* Return the fd mapped to the new socket. */
5798 if (put_user(len, optlen)) {
5800 put_unused_fd(retval);
5804 if (copy_to_user(optval, &peeloff, len)) {
5806 put_unused_fd(retval);
5809 fd_install(retval, newfile);
5814 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5815 char __user *optval, int __user *optlen)
5817 sctp_peeloff_flags_arg_t peeloff;
5818 struct file *newfile = NULL;
5821 if (len < sizeof(sctp_peeloff_flags_arg_t))
5823 len = sizeof(sctp_peeloff_flags_arg_t);
5824 if (copy_from_user(&peeloff, optval, len))
5827 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5828 &newfile, peeloff.flags);
5832 /* Return the fd mapped to the new socket. */
5833 if (put_user(len, optlen)) {
5835 put_unused_fd(retval);
5839 if (copy_to_user(optval, &peeloff, len)) {
5841 put_unused_fd(retval);
5844 fd_install(retval, newfile);
5849 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5851 * Applications can enable or disable heartbeats for any peer address of
5852 * an association, modify an address's heartbeat interval, force a
5853 * heartbeat to be sent immediately, and adjust the address's maximum
5854 * number of retransmissions sent before an address is considered
5855 * unreachable. The following structure is used to access and modify an
5856 * address's parameters:
5858 * struct sctp_paddrparams {
5859 * sctp_assoc_t spp_assoc_id;
5860 * struct sockaddr_storage spp_address;
5861 * uint32_t spp_hbinterval;
5862 * uint16_t spp_pathmaxrxt;
5863 * uint32_t spp_pathmtu;
5864 * uint32_t spp_sackdelay;
5865 * uint32_t spp_flags;
5868 * spp_assoc_id - (one-to-many style socket) This is filled in the
5869 * application, and identifies the association for
5871 * spp_address - This specifies which address is of interest.
5872 * spp_hbinterval - This contains the value of the heartbeat interval,
5873 * in milliseconds. If a value of zero
5874 * is present in this field then no changes are to
5875 * be made to this parameter.
5876 * spp_pathmaxrxt - This contains the maximum number of
5877 * retransmissions before this address shall be
5878 * considered unreachable. If a value of zero
5879 * is present in this field then no changes are to
5880 * be made to this parameter.
5881 * spp_pathmtu - When Path MTU discovery is disabled the value
5882 * specified here will be the "fixed" path mtu.
5883 * Note that if the spp_address field is empty
5884 * then all associations on this address will
5885 * have this fixed path mtu set upon them.
5887 * spp_sackdelay - When delayed sack is enabled, this value specifies
5888 * the number of milliseconds that sacks will be delayed
5889 * for. This value will apply to all addresses of an
5890 * association if the spp_address field is empty. Note
5891 * also, that if delayed sack is enabled and this
5892 * value is set to 0, no change is made to the last
5893 * recorded delayed sack timer value.
5895 * spp_flags - These flags are used to control various features
5896 * on an association. The flag field may contain
5897 * zero or more of the following options.
5899 * SPP_HB_ENABLE - Enable heartbeats on the
5900 * specified address. Note that if the address
5901 * field is empty all addresses for the association
5902 * have heartbeats enabled upon them.
5904 * SPP_HB_DISABLE - Disable heartbeats on the
5905 * speicifed address. Note that if the address
5906 * field is empty all addresses for the association
5907 * will have their heartbeats disabled. Note also
5908 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5909 * mutually exclusive, only one of these two should
5910 * be specified. Enabling both fields will have
5911 * undetermined results.
5913 * SPP_HB_DEMAND - Request a user initiated heartbeat
5914 * to be made immediately.
5916 * SPP_PMTUD_ENABLE - This field will enable PMTU
5917 * discovery upon the specified address. Note that
5918 * if the address feild is empty then all addresses
5919 * on the association are effected.
5921 * SPP_PMTUD_DISABLE - This field will disable PMTU
5922 * discovery upon the specified address. Note that
5923 * if the address feild is empty then all addresses
5924 * on the association are effected. Not also that
5925 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5926 * exclusive. Enabling both will have undetermined
5929 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5930 * on delayed sack. The time specified in spp_sackdelay
5931 * is used to specify the sack delay for this address. Note
5932 * that if spp_address is empty then all addresses will
5933 * enable delayed sack and take on the sack delay
5934 * value specified in spp_sackdelay.
5935 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5936 * off delayed sack. If the spp_address field is blank then
5937 * delayed sack is disabled for the entire association. Note
5938 * also that this field is mutually exclusive to
5939 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5942 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5943 * setting of the IPV6 flow label value. The value is
5944 * contained in the spp_ipv6_flowlabel field.
5945 * Upon retrieval, this flag will be set to indicate that
5946 * the spp_ipv6_flowlabel field has a valid value returned.
5947 * If a specific destination address is set (in the
5948 * spp_address field), then the value returned is that of
5949 * the address. If just an association is specified (and
5950 * no address), then the association's default flow label
5951 * is returned. If neither an association nor a destination
5952 * is specified, then the socket's default flow label is
5953 * returned. For non-IPv6 sockets, this flag will be left
5956 * SPP_DSCP: Setting this flag enables the setting of the
5957 * Differentiated Services Code Point (DSCP) value
5958 * associated with either the association or a specific
5959 * address. The value is obtained in the spp_dscp field.
5960 * Upon retrieval, this flag will be set to indicate that
5961 * the spp_dscp field has a valid value returned. If a
5962 * specific destination address is set when called (in the
5963 * spp_address field), then that specific destination
5964 * address's DSCP value is returned. If just an association
5965 * is specified, then the association's default DSCP is
5966 * returned. If neither an association nor a destination is
5967 * specified, then the socket's default DSCP is returned.
5969 * spp_ipv6_flowlabel
5970 * - This field is used in conjunction with the
5971 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5972 * The 20 least significant bits are used for the flow
5973 * label. This setting has precedence over any IPv6-layer
5976 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5977 * and contains the DSCP. The 6 most significant bits are
5978 * used for the DSCP. This setting has precedence over any
5979 * IPv4- or IPv6- layer setting.
5981 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5982 char __user *optval, int __user *optlen)
5984 struct sctp_paddrparams params;
5985 struct sctp_transport *trans = NULL;
5986 struct sctp_association *asoc = NULL;
5987 struct sctp_sock *sp = sctp_sk(sk);
5989 if (len >= sizeof(params))
5990 len = sizeof(params);
5991 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5992 spp_ipv6_flowlabel), 4))
5993 len = ALIGN(offsetof(struct sctp_paddrparams,
5994 spp_ipv6_flowlabel), 4);
5998 if (copy_from_user(¶ms, optval, len))
6001 /* If an address other than INADDR_ANY is specified, and
6002 * no transport is found, then the request is invalid.
6004 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
6005 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
6006 params.spp_assoc_id);
6008 pr_debug("%s: failed no transport\n", __func__);
6013 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
6014 * socket is a one to many style socket, and an association
6015 * was not found, then the id was invalid.
6017 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
6018 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
6019 sctp_style(sk, UDP)) {
6020 pr_debug("%s: failed no association\n", __func__);
6025 /* Fetch transport values. */
6026 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
6027 params.spp_pathmtu = trans->pathmtu;
6028 params.spp_pathmaxrxt = trans->pathmaxrxt;
6029 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
6031 /*draft-11 doesn't say what to return in spp_flags*/
6032 params.spp_flags = trans->param_flags;
6033 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6034 params.spp_ipv6_flowlabel = trans->flowlabel &
6035 SCTP_FLOWLABEL_VAL_MASK;
6036 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6038 if (trans->dscp & SCTP_DSCP_SET_MASK) {
6039 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
6040 params.spp_flags |= SPP_DSCP;
6043 /* Fetch association values. */
6044 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
6045 params.spp_pathmtu = asoc->pathmtu;
6046 params.spp_pathmaxrxt = asoc->pathmaxrxt;
6047 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
6049 /*draft-11 doesn't say what to return in spp_flags*/
6050 params.spp_flags = asoc->param_flags;
6051 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6052 params.spp_ipv6_flowlabel = asoc->flowlabel &
6053 SCTP_FLOWLABEL_VAL_MASK;
6054 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6056 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
6057 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
6058 params.spp_flags |= SPP_DSCP;
6061 /* Fetch socket values. */
6062 params.spp_hbinterval = sp->hbinterval;
6063 params.spp_pathmtu = sp->pathmtu;
6064 params.spp_sackdelay = sp->sackdelay;
6065 params.spp_pathmaxrxt = sp->pathmaxrxt;
6067 /*draft-11 doesn't say what to return in spp_flags*/
6068 params.spp_flags = sp->param_flags;
6069 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6070 params.spp_ipv6_flowlabel = sp->flowlabel &
6071 SCTP_FLOWLABEL_VAL_MASK;
6072 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6074 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6075 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6076 params.spp_flags |= SPP_DSCP;
6080 if (copy_to_user(optval, ¶ms, len))
6083 if (put_user(len, optlen))
6090 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6092 * This option will effect the way delayed acks are performed. This
6093 * option allows you to get or set the delayed ack time, in
6094 * milliseconds. It also allows changing the delayed ack frequency.
6095 * Changing the frequency to 1 disables the delayed sack algorithm. If
6096 * the assoc_id is 0, then this sets or gets the endpoints default
6097 * values. If the assoc_id field is non-zero, then the set or get
6098 * effects the specified association for the one to many model (the
6099 * assoc_id field is ignored by the one to one model). Note that if
6100 * sack_delay or sack_freq are 0 when setting this option, then the
6101 * current values will remain unchanged.
6103 * struct sctp_sack_info {
6104 * sctp_assoc_t sack_assoc_id;
6105 * uint32_t sack_delay;
6106 * uint32_t sack_freq;
6109 * sack_assoc_id - This parameter, indicates which association the user
6110 * is performing an action upon. Note that if this field's value is
6111 * zero then the endpoints default value is changed (effecting future
6112 * associations only).
6114 * sack_delay - This parameter contains the number of milliseconds that
6115 * the user is requesting the delayed ACK timer be set to. Note that
6116 * this value is defined in the standard to be between 200 and 500
6119 * sack_freq - This parameter contains the number of packets that must
6120 * be received before a sack is sent without waiting for the delay
6121 * timer to expire. The default value for this is 2, setting this
6122 * value to 1 will disable the delayed sack algorithm.
6124 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6125 char __user *optval,
6128 struct sctp_sack_info params;
6129 struct sctp_association *asoc = NULL;
6130 struct sctp_sock *sp = sctp_sk(sk);
6132 if (len >= sizeof(struct sctp_sack_info)) {
6133 len = sizeof(struct sctp_sack_info);
6135 if (copy_from_user(¶ms, optval, len))
6137 } else if (len == sizeof(struct sctp_assoc_value)) {
6138 pr_warn_ratelimited(DEPRECATED
6140 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6141 "Use struct sctp_sack_info instead\n",
6142 current->comm, task_pid_nr(current));
6143 if (copy_from_user(¶ms, optval, len))
6148 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6149 * socket is a one to many style socket, and an association
6150 * was not found, then the id was invalid.
6152 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6153 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6154 sctp_style(sk, UDP))
6158 /* Fetch association values. */
6159 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6160 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6161 params.sack_freq = asoc->sackfreq;
6164 params.sack_delay = 0;
6165 params.sack_freq = 1;
6168 /* Fetch socket values. */
6169 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6170 params.sack_delay = sp->sackdelay;
6171 params.sack_freq = sp->sackfreq;
6173 params.sack_delay = 0;
6174 params.sack_freq = 1;
6178 if (copy_to_user(optval, ¶ms, len))
6181 if (put_user(len, optlen))
6187 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6189 * Applications can specify protocol parameters for the default association
6190 * initialization. The option name argument to setsockopt() and getsockopt()
6193 * Setting initialization parameters is effective only on an unconnected
6194 * socket (for UDP-style sockets only future associations are effected
6195 * by the change). With TCP-style sockets, this option is inherited by
6196 * sockets derived from a listener socket.
6198 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6200 if (len < sizeof(struct sctp_initmsg))
6202 len = sizeof(struct sctp_initmsg);
6203 if (put_user(len, optlen))
6205 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6211 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6212 char __user *optval, int __user *optlen)
6214 struct sctp_association *asoc;
6216 struct sctp_getaddrs getaddrs;
6217 struct sctp_transport *from;
6219 union sctp_addr temp;
6220 struct sctp_sock *sp = sctp_sk(sk);
6225 if (len < sizeof(struct sctp_getaddrs))
6228 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6231 /* For UDP-style sockets, id specifies the association to query. */
6232 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6236 to = optval + offsetof(struct sctp_getaddrs, addrs);
6237 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6239 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6241 memcpy(&temp, &from->ipaddr, sizeof(temp));
6242 addrlen = sctp_get_pf_specific(sk->sk_family)
6243 ->addr_to_user(sp, &temp);
6244 if (space_left < addrlen)
6246 if (copy_to_user(to, &temp, addrlen))
6250 space_left -= addrlen;
6253 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6255 bytes_copied = ((char __user *)to) - optval;
6256 if (put_user(bytes_copied, optlen))
6262 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6263 size_t space_left, int *bytes_copied)
6265 struct sctp_sockaddr_entry *addr;
6266 union sctp_addr temp;
6269 struct net *net = sock_net(sk);
6272 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6276 if ((PF_INET == sk->sk_family) &&
6277 (AF_INET6 == addr->a.sa.sa_family))
6279 if ((PF_INET6 == sk->sk_family) &&
6280 inet_v6_ipv6only(sk) &&
6281 (AF_INET == addr->a.sa.sa_family))
6283 memcpy(&temp, &addr->a, sizeof(temp));
6284 if (!temp.v4.sin_port)
6285 temp.v4.sin_port = htons(port);
6287 addrlen = sctp_get_pf_specific(sk->sk_family)
6288 ->addr_to_user(sctp_sk(sk), &temp);
6290 if (space_left < addrlen) {
6294 memcpy(to, &temp, addrlen);
6298 space_left -= addrlen;
6299 *bytes_copied += addrlen;
6307 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6308 char __user *optval, int __user *optlen)
6310 struct sctp_bind_addr *bp;
6311 struct sctp_association *asoc;
6313 struct sctp_getaddrs getaddrs;
6314 struct sctp_sockaddr_entry *addr;
6316 union sctp_addr temp;
6317 struct sctp_sock *sp = sctp_sk(sk);
6321 int bytes_copied = 0;
6325 if (len < sizeof(struct sctp_getaddrs))
6328 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6332 * For UDP-style sockets, id specifies the association to query.
6333 * If the id field is set to the value '0' then the locally bound
6334 * addresses are returned without regard to any particular
6337 if (0 == getaddrs.assoc_id) {
6338 bp = &sctp_sk(sk)->ep->base.bind_addr;
6340 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6343 bp = &asoc->base.bind_addr;
6346 to = optval + offsetof(struct sctp_getaddrs, addrs);
6347 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6349 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6353 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6354 * addresses from the global local address list.
6356 if (sctp_list_single_entry(&bp->address_list)) {
6357 addr = list_entry(bp->address_list.next,
6358 struct sctp_sockaddr_entry, list);
6359 if (sctp_is_any(sk, &addr->a)) {
6360 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6361 space_left, &bytes_copied);
6371 /* Protection on the bound address list is not needed since
6372 * in the socket option context we hold a socket lock and
6373 * thus the bound address list can't change.
6375 list_for_each_entry(addr, &bp->address_list, list) {
6376 memcpy(&temp, &addr->a, sizeof(temp));
6377 addrlen = sctp_get_pf_specific(sk->sk_family)
6378 ->addr_to_user(sp, &temp);
6379 if (space_left < addrlen) {
6380 err = -ENOMEM; /*fixme: right error?*/
6383 memcpy(buf, &temp, addrlen);
6385 bytes_copied += addrlen;
6387 space_left -= addrlen;
6391 if (copy_to_user(to, addrs, bytes_copied)) {
6395 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6399 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6400 * but we can't change it anymore.
6402 if (put_user(bytes_copied, optlen))
6409 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6411 * Requests that the local SCTP stack use the enclosed peer address as
6412 * the association primary. The enclosed address must be one of the
6413 * association peer's addresses.
6415 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6416 char __user *optval, int __user *optlen)
6418 struct sctp_prim prim;
6419 struct sctp_association *asoc;
6420 struct sctp_sock *sp = sctp_sk(sk);
6422 if (len < sizeof(struct sctp_prim))
6425 len = sizeof(struct sctp_prim);
6427 if (copy_from_user(&prim, optval, len))
6430 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6434 if (!asoc->peer.primary_path)
6437 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6438 asoc->peer.primary_path->af_specific->sockaddr_len);
6440 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6441 (union sctp_addr *)&prim.ssp_addr);
6443 if (put_user(len, optlen))
6445 if (copy_to_user(optval, &prim, len))
6452 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6454 * Requests that the local endpoint set the specified Adaptation Layer
6455 * Indication parameter for all future INIT and INIT-ACK exchanges.
6457 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6458 char __user *optval, int __user *optlen)
6460 struct sctp_setadaptation adaptation;
6462 if (len < sizeof(struct sctp_setadaptation))
6465 len = sizeof(struct sctp_setadaptation);
6467 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6469 if (put_user(len, optlen))
6471 if (copy_to_user(optval, &adaptation, len))
6479 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6481 * Applications that wish to use the sendto() system call may wish to
6482 * specify a default set of parameters that would normally be supplied
6483 * through the inclusion of ancillary data. This socket option allows
6484 * such an application to set the default sctp_sndrcvinfo structure.
6487 * The application that wishes to use this socket option simply passes
6488 * in to this call the sctp_sndrcvinfo structure defined in Section
6489 * 5.2.2) The input parameters accepted by this call include
6490 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6491 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6492 * to this call if the caller is using the UDP model.
6494 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6496 static int sctp_getsockopt_default_send_param(struct sock *sk,
6497 int len, char __user *optval,
6500 struct sctp_sock *sp = sctp_sk(sk);
6501 struct sctp_association *asoc;
6502 struct sctp_sndrcvinfo info;
6504 if (len < sizeof(info))
6509 if (copy_from_user(&info, optval, len))
6512 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6513 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6514 sctp_style(sk, UDP))
6518 info.sinfo_stream = asoc->default_stream;
6519 info.sinfo_flags = asoc->default_flags;
6520 info.sinfo_ppid = asoc->default_ppid;
6521 info.sinfo_context = asoc->default_context;
6522 info.sinfo_timetolive = asoc->default_timetolive;
6524 info.sinfo_stream = sp->default_stream;
6525 info.sinfo_flags = sp->default_flags;
6526 info.sinfo_ppid = sp->default_ppid;
6527 info.sinfo_context = sp->default_context;
6528 info.sinfo_timetolive = sp->default_timetolive;
6531 if (put_user(len, optlen))
6533 if (copy_to_user(optval, &info, len))
6539 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6540 * (SCTP_DEFAULT_SNDINFO)
6542 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6543 char __user *optval,
6546 struct sctp_sock *sp = sctp_sk(sk);
6547 struct sctp_association *asoc;
6548 struct sctp_sndinfo info;
6550 if (len < sizeof(info))
6555 if (copy_from_user(&info, optval, len))
6558 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6559 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6560 sctp_style(sk, UDP))
6564 info.snd_sid = asoc->default_stream;
6565 info.snd_flags = asoc->default_flags;
6566 info.snd_ppid = asoc->default_ppid;
6567 info.snd_context = asoc->default_context;
6569 info.snd_sid = sp->default_stream;
6570 info.snd_flags = sp->default_flags;
6571 info.snd_ppid = sp->default_ppid;
6572 info.snd_context = sp->default_context;
6575 if (put_user(len, optlen))
6577 if (copy_to_user(optval, &info, len))
6585 * 7.1.5 SCTP_NODELAY
6587 * Turn on/off any Nagle-like algorithm. This means that packets are
6588 * generally sent as soon as possible and no unnecessary delays are
6589 * introduced, at the cost of more packets in the network. Expects an
6590 * integer boolean flag.
6593 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6594 char __user *optval, int __user *optlen)
6598 if (len < sizeof(int))
6602 val = (sctp_sk(sk)->nodelay == 1);
6603 if (put_user(len, optlen))
6605 if (copy_to_user(optval, &val, len))
6612 * 7.1.1 SCTP_RTOINFO
6614 * The protocol parameters used to initialize and bound retransmission
6615 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6616 * and modify these parameters.
6617 * All parameters are time values, in milliseconds. A value of 0, when
6618 * modifying the parameters, indicates that the current value should not
6622 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6623 char __user *optval,
6624 int __user *optlen) {
6625 struct sctp_rtoinfo rtoinfo;
6626 struct sctp_association *asoc;
6628 if (len < sizeof (struct sctp_rtoinfo))
6631 len = sizeof(struct sctp_rtoinfo);
6633 if (copy_from_user(&rtoinfo, optval, len))
6636 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6638 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6639 sctp_style(sk, UDP))
6642 /* Values corresponding to the specific association. */
6644 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6645 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6646 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6648 /* Values corresponding to the endpoint. */
6649 struct sctp_sock *sp = sctp_sk(sk);
6651 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6652 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6653 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6656 if (put_user(len, optlen))
6659 if (copy_to_user(optval, &rtoinfo, len))
6667 * 7.1.2 SCTP_ASSOCINFO
6669 * This option is used to tune the maximum retransmission attempts
6670 * of the association.
6671 * Returns an error if the new association retransmission value is
6672 * greater than the sum of the retransmission value of the peer.
6673 * See [SCTP] for more information.
6676 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6677 char __user *optval,
6681 struct sctp_assocparams assocparams;
6682 struct sctp_association *asoc;
6683 struct list_head *pos;
6686 if (len < sizeof (struct sctp_assocparams))
6689 len = sizeof(struct sctp_assocparams);
6691 if (copy_from_user(&assocparams, optval, len))
6694 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6696 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6697 sctp_style(sk, UDP))
6700 /* Values correspoinding to the specific association */
6702 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6703 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6704 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6705 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6707 list_for_each(pos, &asoc->peer.transport_addr_list) {
6711 assocparams.sasoc_number_peer_destinations = cnt;
6713 /* Values corresponding to the endpoint */
6714 struct sctp_sock *sp = sctp_sk(sk);
6716 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6717 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6718 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6719 assocparams.sasoc_cookie_life =
6720 sp->assocparams.sasoc_cookie_life;
6721 assocparams.sasoc_number_peer_destinations =
6723 sasoc_number_peer_destinations;
6726 if (put_user(len, optlen))
6729 if (copy_to_user(optval, &assocparams, len))
6736 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6738 * This socket option is a boolean flag which turns on or off mapped V4
6739 * addresses. If this option is turned on and the socket is type
6740 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6741 * If this option is turned off, then no mapping will be done of V4
6742 * addresses and a user will receive both PF_INET6 and PF_INET type
6743 * addresses on the socket.
6745 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6746 char __user *optval, int __user *optlen)
6749 struct sctp_sock *sp = sctp_sk(sk);
6751 if (len < sizeof(int))
6756 if (put_user(len, optlen))
6758 if (copy_to_user(optval, &val, len))
6765 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6766 * (chapter and verse is quoted at sctp_setsockopt_context())
6768 static int sctp_getsockopt_context(struct sock *sk, int len,
6769 char __user *optval, int __user *optlen)
6771 struct sctp_assoc_value params;
6772 struct sctp_association *asoc;
6774 if (len < sizeof(struct sctp_assoc_value))
6777 len = sizeof(struct sctp_assoc_value);
6779 if (copy_from_user(¶ms, optval, len))
6782 asoc = sctp_id2assoc(sk, params.assoc_id);
6783 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6784 sctp_style(sk, UDP))
6787 params.assoc_value = asoc ? asoc->default_rcv_context
6788 : sctp_sk(sk)->default_rcv_context;
6790 if (put_user(len, optlen))
6792 if (copy_to_user(optval, ¶ms, len))
6799 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6800 * This option will get or set the maximum size to put in any outgoing
6801 * SCTP DATA chunk. If a message is larger than this size it will be
6802 * fragmented by SCTP into the specified size. Note that the underlying
6803 * SCTP implementation may fragment into smaller sized chunks when the
6804 * PMTU of the underlying association is smaller than the value set by
6805 * the user. The default value for this option is '0' which indicates
6806 * the user is NOT limiting fragmentation and only the PMTU will effect
6807 * SCTP's choice of DATA chunk size. Note also that values set larger
6808 * than the maximum size of an IP datagram will effectively let SCTP
6809 * control fragmentation (i.e. the same as setting this option to 0).
6811 * The following structure is used to access and modify this parameter:
6813 * struct sctp_assoc_value {
6814 * sctp_assoc_t assoc_id;
6815 * uint32_t assoc_value;
6818 * assoc_id: This parameter is ignored for one-to-one style sockets.
6819 * For one-to-many style sockets this parameter indicates which
6820 * association the user is performing an action upon. Note that if
6821 * this field's value is zero then the endpoints default value is
6822 * changed (effecting future associations only).
6823 * assoc_value: This parameter specifies the maximum size in bytes.
6825 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6826 char __user *optval, int __user *optlen)
6828 struct sctp_assoc_value params;
6829 struct sctp_association *asoc;
6831 if (len == sizeof(int)) {
6832 pr_warn_ratelimited(DEPRECATED
6834 "Use of int in maxseg socket option.\n"
6835 "Use struct sctp_assoc_value instead\n",
6836 current->comm, task_pid_nr(current));
6837 params.assoc_id = SCTP_FUTURE_ASSOC;
6838 } else if (len >= sizeof(struct sctp_assoc_value)) {
6839 len = sizeof(struct sctp_assoc_value);
6840 if (copy_from_user(¶ms, optval, len))
6845 asoc = sctp_id2assoc(sk, params.assoc_id);
6846 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6847 sctp_style(sk, UDP))
6851 params.assoc_value = asoc->frag_point;
6853 params.assoc_value = sctp_sk(sk)->user_frag;
6855 if (put_user(len, optlen))
6857 if (len == sizeof(int)) {
6858 if (copy_to_user(optval, ¶ms.assoc_value, len))
6861 if (copy_to_user(optval, ¶ms, len))
6869 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6870 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6872 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6873 char __user *optval, int __user *optlen)
6877 if (len < sizeof(int))
6882 val = sctp_sk(sk)->frag_interleave;
6883 if (put_user(len, optlen))
6885 if (copy_to_user(optval, &val, len))
6892 * 7.1.25. Set or Get the sctp partial delivery point
6893 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6895 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6896 char __user *optval,
6901 if (len < sizeof(u32))
6906 val = sctp_sk(sk)->pd_point;
6907 if (put_user(len, optlen))
6909 if (copy_to_user(optval, &val, len))
6916 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6917 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6919 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6920 char __user *optval,
6923 struct sctp_assoc_value params;
6924 struct sctp_association *asoc;
6926 if (len == sizeof(int)) {
6927 pr_warn_ratelimited(DEPRECATED
6929 "Use of int in max_burst socket option.\n"
6930 "Use struct sctp_assoc_value instead\n",
6931 current->comm, task_pid_nr(current));
6932 params.assoc_id = SCTP_FUTURE_ASSOC;
6933 } else if (len >= sizeof(struct sctp_assoc_value)) {
6934 len = sizeof(struct sctp_assoc_value);
6935 if (copy_from_user(¶ms, optval, len))
6940 asoc = sctp_id2assoc(sk, params.assoc_id);
6941 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6942 sctp_style(sk, UDP))
6945 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6947 if (len == sizeof(int)) {
6948 if (copy_to_user(optval, ¶ms.assoc_value, len))
6951 if (copy_to_user(optval, ¶ms, len))
6959 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6960 char __user *optval, int __user *optlen)
6962 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6963 struct sctp_hmacalgo __user *p = (void __user *)optval;
6964 struct sctp_hmac_algo_param *hmacs;
6969 if (!ep->auth_enable)
6972 hmacs = ep->auth_hmacs_list;
6973 data_len = ntohs(hmacs->param_hdr.length) -
6974 sizeof(struct sctp_paramhdr);
6976 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6979 len = sizeof(struct sctp_hmacalgo) + data_len;
6980 num_idents = data_len / sizeof(u16);
6982 if (put_user(len, optlen))
6984 if (put_user(num_idents, &p->shmac_num_idents))
6986 for (i = 0; i < num_idents; i++) {
6987 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6989 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6995 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6996 char __user *optval, int __user *optlen)
6998 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6999 struct sctp_authkeyid val;
7000 struct sctp_association *asoc;
7002 if (len < sizeof(struct sctp_authkeyid))
7005 len = sizeof(struct sctp_authkeyid);
7006 if (copy_from_user(&val, optval, len))
7009 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
7010 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
7014 if (!asoc->peer.auth_capable)
7016 val.scact_keynumber = asoc->active_key_id;
7018 if (!ep->auth_enable)
7020 val.scact_keynumber = ep->active_key_id;
7023 if (put_user(len, optlen))
7025 if (copy_to_user(optval, &val, len))
7031 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
7032 char __user *optval, int __user *optlen)
7034 struct sctp_authchunks __user *p = (void __user *)optval;
7035 struct sctp_authchunks val;
7036 struct sctp_association *asoc;
7037 struct sctp_chunks_param *ch;
7041 if (len < sizeof(struct sctp_authchunks))
7044 if (copy_from_user(&val, optval, sizeof(val)))
7047 to = p->gauth_chunks;
7048 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7052 if (!asoc->peer.auth_capable)
7055 ch = asoc->peer.peer_chunks;
7059 /* See if the user provided enough room for all the data */
7060 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7061 if (len < num_chunks)
7064 if (copy_to_user(to, ch->chunks, num_chunks))
7067 len = sizeof(struct sctp_authchunks) + num_chunks;
7068 if (put_user(len, optlen))
7070 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7075 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7076 char __user *optval, int __user *optlen)
7078 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7079 struct sctp_authchunks __user *p = (void __user *)optval;
7080 struct sctp_authchunks val;
7081 struct sctp_association *asoc;
7082 struct sctp_chunks_param *ch;
7086 if (len < sizeof(struct sctp_authchunks))
7089 if (copy_from_user(&val, optval, sizeof(val)))
7092 to = p->gauth_chunks;
7093 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7094 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7095 sctp_style(sk, UDP))
7099 if (!asoc->peer.auth_capable)
7101 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7103 if (!ep->auth_enable)
7105 ch = ep->auth_chunk_list;
7110 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7111 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7114 if (copy_to_user(to, ch->chunks, num_chunks))
7117 len = sizeof(struct sctp_authchunks) + num_chunks;
7118 if (put_user(len, optlen))
7120 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7127 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7128 * This option gets the current number of associations that are attached
7129 * to a one-to-many style socket. The option value is an uint32_t.
7131 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7132 char __user *optval, int __user *optlen)
7134 struct sctp_sock *sp = sctp_sk(sk);
7135 struct sctp_association *asoc;
7138 if (sctp_style(sk, TCP))
7141 if (len < sizeof(u32))
7146 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7150 if (put_user(len, optlen))
7152 if (copy_to_user(optval, &val, len))
7159 * 8.1.23 SCTP_AUTO_ASCONF
7160 * See the corresponding setsockopt entry as description
7162 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7163 char __user *optval, int __user *optlen)
7167 if (len < sizeof(int))
7171 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7173 if (put_user(len, optlen))
7175 if (copy_to_user(optval, &val, len))
7181 * 8.2.6. Get the Current Identifiers of Associations
7182 * (SCTP_GET_ASSOC_ID_LIST)
7184 * This option gets the current list of SCTP association identifiers of
7185 * the SCTP associations handled by a one-to-many style socket.
7187 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7188 char __user *optval, int __user *optlen)
7190 struct sctp_sock *sp = sctp_sk(sk);
7191 struct sctp_association *asoc;
7192 struct sctp_assoc_ids *ids;
7195 if (sctp_style(sk, TCP))
7198 if (len < sizeof(struct sctp_assoc_ids))
7201 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7205 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7208 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7210 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7214 ids->gaids_number_of_ids = num;
7216 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7217 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7220 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7230 * SCTP_PEER_ADDR_THLDS
7232 * This option allows us to fetch the partially failed threshold for one or all
7233 * transports in an association. See Section 6.1 of:
7234 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7236 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7237 char __user *optval, int len,
7238 int __user *optlen, bool v2)
7240 struct sctp_paddrthlds_v2 val;
7241 struct sctp_transport *trans;
7242 struct sctp_association *asoc;
7245 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7249 if (copy_from_user(&val, optval, len))
7252 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7253 trans = sctp_addr_id2transport(sk, &val.spt_address,
7258 val.spt_pathmaxrxt = trans->pathmaxrxt;
7259 val.spt_pathpfthld = trans->pf_retrans;
7260 val.spt_pathcpthld = trans->ps_retrans;
7265 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7266 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7267 sctp_style(sk, UDP))
7271 val.spt_pathpfthld = asoc->pf_retrans;
7272 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7273 val.spt_pathcpthld = asoc->ps_retrans;
7275 struct sctp_sock *sp = sctp_sk(sk);
7277 val.spt_pathpfthld = sp->pf_retrans;
7278 val.spt_pathmaxrxt = sp->pathmaxrxt;
7279 val.spt_pathcpthld = sp->ps_retrans;
7283 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7290 * SCTP_GET_ASSOC_STATS
7292 * This option retrieves local per endpoint statistics. It is modeled
7293 * after OpenSolaris' implementation
7295 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7296 char __user *optval,
7299 struct sctp_assoc_stats sas;
7300 struct sctp_association *asoc = NULL;
7302 /* User must provide at least the assoc id */
7303 if (len < sizeof(sctp_assoc_t))
7306 /* Allow the struct to grow and fill in as much as possible */
7307 len = min_t(size_t, len, sizeof(sas));
7309 if (copy_from_user(&sas, optval, len))
7312 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7316 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7317 sas.sas_gapcnt = asoc->stats.gapcnt;
7318 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7319 sas.sas_osacks = asoc->stats.osacks;
7320 sas.sas_isacks = asoc->stats.isacks;
7321 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7322 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7323 sas.sas_oodchunks = asoc->stats.oodchunks;
7324 sas.sas_iodchunks = asoc->stats.iodchunks;
7325 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7326 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7327 sas.sas_idupchunks = asoc->stats.idupchunks;
7328 sas.sas_opackets = asoc->stats.opackets;
7329 sas.sas_ipackets = asoc->stats.ipackets;
7331 /* New high max rto observed, will return 0 if not a single
7332 * RTO update took place. obs_rto_ipaddr will be bogus
7335 sas.sas_maxrto = asoc->stats.max_obs_rto;
7336 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7337 sizeof(struct sockaddr_storage));
7339 /* Mark beginning of a new observation period */
7340 asoc->stats.max_obs_rto = asoc->rto_min;
7342 if (put_user(len, optlen))
7345 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7347 if (copy_to_user(optval, &sas, len))
7353 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7354 char __user *optval,
7359 if (len < sizeof(int))
7363 if (sctp_sk(sk)->recvrcvinfo)
7365 if (put_user(len, optlen))
7367 if (copy_to_user(optval, &val, len))
7373 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7374 char __user *optval,
7379 if (len < sizeof(int))
7383 if (sctp_sk(sk)->recvnxtinfo)
7385 if (put_user(len, optlen))
7387 if (copy_to_user(optval, &val, len))
7393 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7394 char __user *optval,
7397 struct sctp_assoc_value params;
7398 struct sctp_association *asoc;
7399 int retval = -EFAULT;
7401 if (len < sizeof(params)) {
7406 len = sizeof(params);
7407 if (copy_from_user(¶ms, optval, len))
7410 asoc = sctp_id2assoc(sk, params.assoc_id);
7411 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7412 sctp_style(sk, UDP)) {
7417 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7418 : sctp_sk(sk)->ep->prsctp_enable;
7420 if (put_user(len, optlen))
7423 if (copy_to_user(optval, ¶ms, len))
7432 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7433 char __user *optval,
7436 struct sctp_default_prinfo info;
7437 struct sctp_association *asoc;
7438 int retval = -EFAULT;
7440 if (len < sizeof(info)) {
7446 if (copy_from_user(&info, optval, len))
7449 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7450 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7451 sctp_style(sk, UDP)) {
7457 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7458 info.pr_value = asoc->default_timetolive;
7460 struct sctp_sock *sp = sctp_sk(sk);
7462 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7463 info.pr_value = sp->default_timetolive;
7466 if (put_user(len, optlen))
7469 if (copy_to_user(optval, &info, len))
7478 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7479 char __user *optval,
7482 struct sctp_prstatus params;
7483 struct sctp_association *asoc;
7485 int retval = -EINVAL;
7487 if (len < sizeof(params))
7490 len = sizeof(params);
7491 if (copy_from_user(¶ms, optval, len)) {
7496 policy = params.sprstat_policy;
7497 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7498 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7501 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7505 if (policy == SCTP_PR_SCTP_ALL) {
7506 params.sprstat_abandoned_unsent = 0;
7507 params.sprstat_abandoned_sent = 0;
7508 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7509 params.sprstat_abandoned_unsent +=
7510 asoc->abandoned_unsent[policy];
7511 params.sprstat_abandoned_sent +=
7512 asoc->abandoned_sent[policy];
7515 params.sprstat_abandoned_unsent =
7516 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7517 params.sprstat_abandoned_sent =
7518 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7521 if (put_user(len, optlen)) {
7526 if (copy_to_user(optval, ¶ms, len)) {
7537 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7538 char __user *optval,
7541 struct sctp_stream_out_ext *streamoute;
7542 struct sctp_association *asoc;
7543 struct sctp_prstatus params;
7544 int retval = -EINVAL;
7547 if (len < sizeof(params))
7550 len = sizeof(params);
7551 if (copy_from_user(¶ms, optval, len)) {
7556 policy = params.sprstat_policy;
7557 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7558 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7561 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7562 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7565 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7567 /* Not allocated yet, means all stats are 0 */
7568 params.sprstat_abandoned_unsent = 0;
7569 params.sprstat_abandoned_sent = 0;
7574 if (policy == SCTP_PR_SCTP_ALL) {
7575 params.sprstat_abandoned_unsent = 0;
7576 params.sprstat_abandoned_sent = 0;
7577 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7578 params.sprstat_abandoned_unsent +=
7579 streamoute->abandoned_unsent[policy];
7580 params.sprstat_abandoned_sent +=
7581 streamoute->abandoned_sent[policy];
7584 params.sprstat_abandoned_unsent =
7585 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7586 params.sprstat_abandoned_sent =
7587 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7590 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7601 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7602 char __user *optval,
7605 struct sctp_assoc_value params;
7606 struct sctp_association *asoc;
7607 int retval = -EFAULT;
7609 if (len < sizeof(params)) {
7614 len = sizeof(params);
7615 if (copy_from_user(¶ms, optval, len))
7618 asoc = sctp_id2assoc(sk, params.assoc_id);
7619 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7620 sctp_style(sk, UDP)) {
7625 params.assoc_value = asoc ? asoc->peer.reconf_capable
7626 : sctp_sk(sk)->ep->reconf_enable;
7628 if (put_user(len, optlen))
7631 if (copy_to_user(optval, ¶ms, len))
7640 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7641 char __user *optval,
7644 struct sctp_assoc_value params;
7645 struct sctp_association *asoc;
7646 int retval = -EFAULT;
7648 if (len < sizeof(params)) {
7653 len = sizeof(params);
7654 if (copy_from_user(¶ms, optval, len))
7657 asoc = sctp_id2assoc(sk, params.assoc_id);
7658 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7659 sctp_style(sk, UDP)) {
7664 params.assoc_value = asoc ? asoc->strreset_enable
7665 : sctp_sk(sk)->ep->strreset_enable;
7667 if (put_user(len, optlen))
7670 if (copy_to_user(optval, ¶ms, len))
7679 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7680 char __user *optval,
7683 struct sctp_assoc_value params;
7684 struct sctp_association *asoc;
7685 int retval = -EFAULT;
7687 if (len < sizeof(params)) {
7692 len = sizeof(params);
7693 if (copy_from_user(¶ms, optval, len))
7696 asoc = sctp_id2assoc(sk, params.assoc_id);
7697 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7698 sctp_style(sk, UDP)) {
7703 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7704 : sctp_sk(sk)->default_ss;
7706 if (put_user(len, optlen))
7709 if (copy_to_user(optval, ¶ms, len))
7718 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7719 char __user *optval,
7722 struct sctp_stream_value params;
7723 struct sctp_association *asoc;
7724 int retval = -EFAULT;
7726 if (len < sizeof(params)) {
7731 len = sizeof(params);
7732 if (copy_from_user(¶ms, optval, len))
7735 asoc = sctp_id2assoc(sk, params.assoc_id);
7741 retval = sctp_sched_get_value(asoc, params.stream_id,
7742 ¶ms.stream_value);
7746 if (put_user(len, optlen)) {
7751 if (copy_to_user(optval, ¶ms, len)) {
7760 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7761 char __user *optval,
7764 struct sctp_assoc_value params;
7765 struct sctp_association *asoc;
7766 int retval = -EFAULT;
7768 if (len < sizeof(params)) {
7773 len = sizeof(params);
7774 if (copy_from_user(¶ms, optval, len))
7777 asoc = sctp_id2assoc(sk, params.assoc_id);
7778 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7779 sctp_style(sk, UDP)) {
7784 params.assoc_value = asoc ? asoc->peer.intl_capable
7785 : sctp_sk(sk)->ep->intl_enable;
7787 if (put_user(len, optlen))
7790 if (copy_to_user(optval, ¶ms, len))
7799 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7800 char __user *optval,
7805 if (len < sizeof(int))
7809 val = sctp_sk(sk)->reuse;
7810 if (put_user(len, optlen))
7813 if (copy_to_user(optval, &val, len))
7819 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7822 struct sctp_association *asoc;
7823 struct sctp_event param;
7826 if (len < sizeof(param))
7829 len = sizeof(param);
7830 if (copy_from_user(¶m, optval, len))
7833 if (param.se_type < SCTP_SN_TYPE_BASE ||
7834 param.se_type > SCTP_SN_TYPE_MAX)
7837 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7838 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7839 sctp_style(sk, UDP))
7842 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7843 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7845 if (put_user(len, optlen))
7848 if (copy_to_user(optval, ¶m, len))
7854 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7855 char __user *optval,
7858 struct sctp_assoc_value params;
7859 struct sctp_association *asoc;
7860 int retval = -EFAULT;
7862 if (len < sizeof(params)) {
7867 len = sizeof(params);
7868 if (copy_from_user(¶ms, optval, len))
7871 asoc = sctp_id2assoc(sk, params.assoc_id);
7872 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7873 sctp_style(sk, UDP)) {
7878 params.assoc_value = asoc ? asoc->peer.asconf_capable
7879 : sctp_sk(sk)->ep->asconf_enable;
7881 if (put_user(len, optlen))
7884 if (copy_to_user(optval, ¶ms, len))
7893 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7894 char __user *optval,
7897 struct sctp_assoc_value params;
7898 struct sctp_association *asoc;
7899 int retval = -EFAULT;
7901 if (len < sizeof(params)) {
7906 len = sizeof(params);
7907 if (copy_from_user(¶ms, optval, len))
7910 asoc = sctp_id2assoc(sk, params.assoc_id);
7911 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7912 sctp_style(sk, UDP)) {
7917 params.assoc_value = asoc ? asoc->peer.auth_capable
7918 : sctp_sk(sk)->ep->auth_enable;
7920 if (put_user(len, optlen))
7923 if (copy_to_user(optval, ¶ms, len))
7932 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7933 char __user *optval,
7936 struct sctp_assoc_value params;
7937 struct sctp_association *asoc;
7938 int retval = -EFAULT;
7940 if (len < sizeof(params)) {
7945 len = sizeof(params);
7946 if (copy_from_user(¶ms, optval, len))
7949 asoc = sctp_id2assoc(sk, params.assoc_id);
7950 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7951 sctp_style(sk, UDP)) {
7956 params.assoc_value = asoc ? asoc->peer.ecn_capable
7957 : sctp_sk(sk)->ep->ecn_enable;
7959 if (put_user(len, optlen))
7962 if (copy_to_user(optval, ¶ms, len))
7971 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7972 char __user *optval,
7975 struct sctp_assoc_value params;
7976 struct sctp_association *asoc;
7977 int retval = -EFAULT;
7979 if (len < sizeof(params)) {
7984 len = sizeof(params);
7985 if (copy_from_user(¶ms, optval, len))
7988 asoc = sctp_id2assoc(sk, params.assoc_id);
7989 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7990 sctp_style(sk, UDP)) {
7995 params.assoc_value = asoc ? asoc->pf_expose
7996 : sctp_sk(sk)->pf_expose;
7998 if (put_user(len, optlen))
8001 if (copy_to_user(optval, ¶ms, len))
8010 static int sctp_getsockopt(struct sock *sk, int level, int optname,
8011 char __user *optval, int __user *optlen)
8016 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8018 /* I can hardly begin to describe how wrong this is. This is
8019 * so broken as to be worse than useless. The API draft
8020 * REALLY is NOT helpful here... I am not convinced that the
8021 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8022 * are at all well-founded.
8024 if (level != SOL_SCTP) {
8025 struct sctp_af *af = sctp_sk(sk)->pf->af;
8027 retval = af->getsockopt(sk, level, optname, optval, optlen);
8031 if (get_user(len, optlen))
8041 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8043 case SCTP_DISABLE_FRAGMENTS:
8044 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8048 retval = sctp_getsockopt_events(sk, len, optval, optlen);
8050 case SCTP_AUTOCLOSE:
8051 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8053 case SCTP_SOCKOPT_PEELOFF:
8054 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8056 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8057 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8059 case SCTP_PEER_ADDR_PARAMS:
8060 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8063 case SCTP_DELAYED_SACK:
8064 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8068 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8070 case SCTP_GET_PEER_ADDRS:
8071 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8074 case SCTP_GET_LOCAL_ADDRS:
8075 retval = sctp_getsockopt_local_addrs(sk, len, optval,
8078 case SCTP_SOCKOPT_CONNECTX3:
8079 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8081 case SCTP_DEFAULT_SEND_PARAM:
8082 retval = sctp_getsockopt_default_send_param(sk, len,
8085 case SCTP_DEFAULT_SNDINFO:
8086 retval = sctp_getsockopt_default_sndinfo(sk, len,
8089 case SCTP_PRIMARY_ADDR:
8090 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8093 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8096 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8098 case SCTP_ASSOCINFO:
8099 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8101 case SCTP_I_WANT_MAPPED_V4_ADDR:
8102 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8105 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8107 case SCTP_GET_PEER_ADDR_INFO:
8108 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8111 case SCTP_ADAPTATION_LAYER:
8112 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8116 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8118 case SCTP_FRAGMENT_INTERLEAVE:
8119 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8122 case SCTP_PARTIAL_DELIVERY_POINT:
8123 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8126 case SCTP_MAX_BURST:
8127 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8130 case SCTP_AUTH_CHUNK:
8131 case SCTP_AUTH_DELETE_KEY:
8132 case SCTP_AUTH_DEACTIVATE_KEY:
8133 retval = -EOPNOTSUPP;
8135 case SCTP_HMAC_IDENT:
8136 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8138 case SCTP_AUTH_ACTIVE_KEY:
8139 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8141 case SCTP_PEER_AUTH_CHUNKS:
8142 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8145 case SCTP_LOCAL_AUTH_CHUNKS:
8146 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8149 case SCTP_GET_ASSOC_NUMBER:
8150 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8152 case SCTP_GET_ASSOC_ID_LIST:
8153 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8155 case SCTP_AUTO_ASCONF:
8156 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8158 case SCTP_PEER_ADDR_THLDS:
8159 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8162 case SCTP_PEER_ADDR_THLDS_V2:
8163 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8166 case SCTP_GET_ASSOC_STATS:
8167 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8169 case SCTP_RECVRCVINFO:
8170 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8172 case SCTP_RECVNXTINFO:
8173 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8175 case SCTP_PR_SUPPORTED:
8176 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8178 case SCTP_DEFAULT_PRINFO:
8179 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8182 case SCTP_PR_ASSOC_STATUS:
8183 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8186 case SCTP_PR_STREAM_STATUS:
8187 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8190 case SCTP_RECONFIG_SUPPORTED:
8191 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8194 case SCTP_ENABLE_STREAM_RESET:
8195 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8198 case SCTP_STREAM_SCHEDULER:
8199 retval = sctp_getsockopt_scheduler(sk, len, optval,
8202 case SCTP_STREAM_SCHEDULER_VALUE:
8203 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8206 case SCTP_INTERLEAVING_SUPPORTED:
8207 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8210 case SCTP_REUSE_PORT:
8211 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8214 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8216 case SCTP_ASCONF_SUPPORTED:
8217 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8220 case SCTP_AUTH_SUPPORTED:
8221 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8224 case SCTP_ECN_SUPPORTED:
8225 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8227 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8228 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8231 retval = -ENOPROTOOPT;
8239 static int sctp_hash(struct sock *sk)
8245 static void sctp_unhash(struct sock *sk)
8250 /* Check if port is acceptable. Possibly find first available port.
8252 * The port hash table (contained in the 'global' SCTP protocol storage
8253 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8254 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8255 * list (the list number is the port number hashed out, so as you
8256 * would expect from a hash function, all the ports in a given list have
8257 * such a number that hashes out to the same list number; you were
8258 * expecting that, right?); so each list has a set of ports, with a
8259 * link to the socket (struct sock) that uses it, the port number and
8260 * a fastreuse flag (FIXME: NPI ipg).
8262 static struct sctp_bind_bucket *sctp_bucket_create(
8263 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8265 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8267 struct sctp_sock *sp = sctp_sk(sk);
8268 bool reuse = (sk->sk_reuse || sp->reuse);
8269 struct sctp_bind_hashbucket *head; /* hash list */
8270 struct net *net = sock_net(sk);
8271 kuid_t uid = sock_i_uid(sk);
8272 struct sctp_bind_bucket *pp;
8273 unsigned short snum;
8276 snum = ntohs(addr->v4.sin_port);
8278 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8283 /* Search for an available port. */
8284 int low, high, remaining, index;
8287 inet_get_local_port_range(net, &low, &high);
8288 remaining = (high - low) + 1;
8289 rover = prandom_u32() % remaining + low;
8293 if ((rover < low) || (rover > high))
8295 if (inet_is_local_reserved_port(net, rover))
8297 index = sctp_phashfn(net, rover);
8298 head = &sctp_port_hashtable[index];
8299 spin_lock(&head->lock);
8300 sctp_for_each_hentry(pp, &head->chain)
8301 if ((pp->port == rover) &&
8302 net_eq(net, pp->net))
8306 spin_unlock(&head->lock);
8307 } while (--remaining > 0);
8309 /* Exhausted local port range during search? */
8314 /* OK, here is the one we will use. HEAD (the port
8315 * hash table list entry) is non-NULL and we hold it's
8320 /* We are given an specific port number; we verify
8321 * that it is not being used. If it is used, we will
8322 * exahust the search in the hash list corresponding
8323 * to the port number (snum) - we detect that with the
8324 * port iterator, pp being NULL.
8326 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8327 spin_lock(&head->lock);
8328 sctp_for_each_hentry(pp, &head->chain) {
8329 if ((pp->port == snum) && net_eq(pp->net, net))
8336 if (!hlist_empty(&pp->owner)) {
8337 /* We had a port hash table hit - there is an
8338 * available port (pp != NULL) and it is being
8339 * used by other socket (pp->owner not empty); that other
8340 * socket is going to be sk2.
8344 pr_debug("%s: found a possible match\n", __func__);
8346 if ((pp->fastreuse && reuse &&
8347 sk->sk_state != SCTP_SS_LISTENING) ||
8348 (pp->fastreuseport && sk->sk_reuseport &&
8349 uid_eq(pp->fastuid, uid)))
8352 /* Run through the list of sockets bound to the port
8353 * (pp->port) [via the pointers bind_next and
8354 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8355 * we get the endpoint they describe and run through
8356 * the endpoint's list of IP (v4 or v6) addresses,
8357 * comparing each of the addresses with the address of
8358 * the socket sk. If we find a match, then that means
8359 * that this port/socket (sk) combination are already
8362 sk_for_each_bound(sk2, &pp->owner) {
8363 struct sctp_sock *sp2 = sctp_sk(sk2);
8364 struct sctp_endpoint *ep2 = sp2->ep;
8367 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8368 sk2->sk_state != SCTP_SS_LISTENING) ||
8369 (sk->sk_reuseport && sk2->sk_reuseport &&
8370 uid_eq(uid, sock_i_uid(sk2))))
8373 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8380 pr_debug("%s: found a match\n", __func__);
8383 /* If there was a hash table miss, create a new port. */
8385 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8388 /* In either case (hit or miss), make sure fastreuse is 1 only
8389 * if sk->sk_reuse is too (that is, if the caller requested
8390 * SO_REUSEADDR on this socket -sk-).
8392 if (hlist_empty(&pp->owner)) {
8393 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8398 if (sk->sk_reuseport) {
8399 pp->fastreuseport = 1;
8402 pp->fastreuseport = 0;
8405 if (pp->fastreuse &&
8406 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8409 if (pp->fastreuseport &&
8410 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8411 pp->fastreuseport = 0;
8414 /* We are set, so fill up all the data in the hash table
8415 * entry, tie the socket list information with the rest of the
8416 * sockets FIXME: Blurry, NPI (ipg).
8419 if (!sp->bind_hash) {
8420 inet_sk(sk)->inet_num = snum;
8421 sk_add_bind_node(sk, &pp->owner);
8427 spin_unlock(&head->lock);
8434 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8435 * port is requested.
8437 static int sctp_get_port(struct sock *sk, unsigned short snum)
8439 union sctp_addr addr;
8440 struct sctp_af *af = sctp_sk(sk)->pf->af;
8442 /* Set up a dummy address struct from the sk. */
8443 af->from_sk(&addr, sk);
8444 addr.v4.sin_port = htons(snum);
8446 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8447 return sctp_get_port_local(sk, &addr);
8451 * Move a socket to LISTENING state.
8453 static int sctp_listen_start(struct sock *sk, int backlog)
8455 struct sctp_sock *sp = sctp_sk(sk);
8456 struct sctp_endpoint *ep = sp->ep;
8457 struct crypto_shash *tfm = NULL;
8460 /* Allocate HMAC for generating cookie. */
8461 if (!sp->hmac && sp->sctp_hmac_alg) {
8462 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8463 tfm = crypto_alloc_shash(alg, 0, 0);
8465 net_info_ratelimited("failed to load transform for %s: %ld\n",
8466 sp->sctp_hmac_alg, PTR_ERR(tfm));
8469 sctp_sk(sk)->hmac = tfm;
8473 * If a bind() or sctp_bindx() is not called prior to a listen()
8474 * call that allows new associations to be accepted, the system
8475 * picks an ephemeral port and will choose an address set equivalent
8476 * to binding with a wildcard address.
8478 * This is not currently spelled out in the SCTP sockets
8479 * extensions draft, but follows the practice as seen in TCP
8483 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8484 if (!ep->base.bind_addr.port) {
8485 if (sctp_autobind(sk))
8488 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8489 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8494 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8495 return sctp_hash_endpoint(ep);
8499 * 4.1.3 / 5.1.3 listen()
8501 * By default, new associations are not accepted for UDP style sockets.
8502 * An application uses listen() to mark a socket as being able to
8503 * accept new associations.
8505 * On TCP style sockets, applications use listen() to ready the SCTP
8506 * endpoint for accepting inbound associations.
8508 * On both types of endpoints a backlog of '0' disables listening.
8510 * Move a socket to LISTENING state.
8512 int sctp_inet_listen(struct socket *sock, int backlog)
8514 struct sock *sk = sock->sk;
8515 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8518 if (unlikely(backlog < 0))
8523 /* Peeled-off sockets are not allowed to listen(). */
8524 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8527 if (sock->state != SS_UNCONNECTED)
8530 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8533 /* If backlog is zero, disable listening. */
8535 if (sctp_sstate(sk, CLOSED))
8539 sctp_unhash_endpoint(ep);
8540 sk->sk_state = SCTP_SS_CLOSED;
8541 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8542 sctp_sk(sk)->bind_hash->fastreuse = 1;
8546 /* If we are already listening, just update the backlog */
8547 if (sctp_sstate(sk, LISTENING))
8548 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8550 err = sctp_listen_start(sk, backlog);
8562 * This function is done by modeling the current datagram_poll() and the
8563 * tcp_poll(). Note that, based on these implementations, we don't
8564 * lock the socket in this function, even though it seems that,
8565 * ideally, locking or some other mechanisms can be used to ensure
8566 * the integrity of the counters (sndbuf and wmem_alloc) used
8567 * in this place. We assume that we don't need locks either until proven
8570 * Another thing to note is that we include the Async I/O support
8571 * here, again, by modeling the current TCP/UDP code. We don't have
8572 * a good way to test with it yet.
8574 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8576 struct sock *sk = sock->sk;
8577 struct sctp_sock *sp = sctp_sk(sk);
8580 poll_wait(file, sk_sleep(sk), wait);
8582 sock_rps_record_flow(sk);
8584 /* A TCP-style listening socket becomes readable when the accept queue
8587 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8588 return (!list_empty(&sp->ep->asocs)) ?
8589 (EPOLLIN | EPOLLRDNORM) : 0;
8593 /* Is there any exceptional events? */
8594 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8596 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8597 if (sk->sk_shutdown & RCV_SHUTDOWN)
8598 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8599 if (sk->sk_shutdown == SHUTDOWN_MASK)
8602 /* Is it readable? Reconsider this code with TCP-style support. */
8603 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8604 mask |= EPOLLIN | EPOLLRDNORM;
8606 /* The association is either gone or not ready. */
8607 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8610 /* Is it writable? */
8611 if (sctp_writeable(sk)) {
8612 mask |= EPOLLOUT | EPOLLWRNORM;
8614 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8616 * Since the socket is not locked, the buffer
8617 * might be made available after the writeable check and
8618 * before the bit is set. This could cause a lost I/O
8619 * signal. tcp_poll() has a race breaker for this race
8620 * condition. Based on their implementation, we put
8621 * in the following code to cover it as well.
8623 if (sctp_writeable(sk))
8624 mask |= EPOLLOUT | EPOLLWRNORM;
8629 /********************************************************************
8630 * 2nd Level Abstractions
8631 ********************************************************************/
8633 static struct sctp_bind_bucket *sctp_bucket_create(
8634 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8636 struct sctp_bind_bucket *pp;
8638 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8640 SCTP_DBG_OBJCNT_INC(bind_bucket);
8643 INIT_HLIST_HEAD(&pp->owner);
8645 hlist_add_head(&pp->node, &head->chain);
8650 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8651 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8653 if (pp && hlist_empty(&pp->owner)) {
8654 __hlist_del(&pp->node);
8655 kmem_cache_free(sctp_bucket_cachep, pp);
8656 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8660 /* Release this socket's reference to a local port. */
8661 static inline void __sctp_put_port(struct sock *sk)
8663 struct sctp_bind_hashbucket *head =
8664 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8665 inet_sk(sk)->inet_num)];
8666 struct sctp_bind_bucket *pp;
8668 spin_lock(&head->lock);
8669 pp = sctp_sk(sk)->bind_hash;
8670 __sk_del_bind_node(sk);
8671 sctp_sk(sk)->bind_hash = NULL;
8672 inet_sk(sk)->inet_num = 0;
8673 sctp_bucket_destroy(pp);
8674 spin_unlock(&head->lock);
8677 void sctp_put_port(struct sock *sk)
8680 __sctp_put_port(sk);
8685 * The system picks an ephemeral port and choose an address set equivalent
8686 * to binding with a wildcard address.
8687 * One of those addresses will be the primary address for the association.
8688 * This automatically enables the multihoming capability of SCTP.
8690 static int sctp_autobind(struct sock *sk)
8692 union sctp_addr autoaddr;
8696 /* Initialize a local sockaddr structure to INADDR_ANY. */
8697 af = sctp_sk(sk)->pf->af;
8699 port = htons(inet_sk(sk)->inet_num);
8700 af->inaddr_any(&autoaddr, port);
8702 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8705 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8708 * 4.2 The cmsghdr Structure *
8710 * When ancillary data is sent or received, any number of ancillary data
8711 * objects can be specified by the msg_control and msg_controllen members of
8712 * the msghdr structure, because each object is preceded by
8713 * a cmsghdr structure defining the object's length (the cmsg_len member).
8714 * Historically Berkeley-derived implementations have passed only one object
8715 * at a time, but this API allows multiple objects to be
8716 * passed in a single call to sendmsg() or recvmsg(). The following example
8717 * shows two ancillary data objects in a control buffer.
8719 * |<--------------------------- msg_controllen -------------------------->|
8722 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8724 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8727 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8729 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8732 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8733 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8735 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8737 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8744 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8746 struct msghdr *my_msg = (struct msghdr *)msg;
8747 struct cmsghdr *cmsg;
8749 for_each_cmsghdr(cmsg, my_msg) {
8750 if (!CMSG_OK(my_msg, cmsg))
8753 /* Should we parse this header or ignore? */
8754 if (cmsg->cmsg_level != IPPROTO_SCTP)
8757 /* Strictly check lengths following example in SCM code. */
8758 switch (cmsg->cmsg_type) {
8760 /* SCTP Socket API Extension
8761 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8763 * This cmsghdr structure provides information for
8764 * initializing new SCTP associations with sendmsg().
8765 * The SCTP_INITMSG socket option uses this same data
8766 * structure. This structure is not used for
8769 * cmsg_level cmsg_type cmsg_data[]
8770 * ------------ ------------ ----------------------
8771 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8773 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8776 cmsgs->init = CMSG_DATA(cmsg);
8780 /* SCTP Socket API Extension
8781 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8783 * This cmsghdr structure specifies SCTP options for
8784 * sendmsg() and describes SCTP header information
8785 * about a received message through recvmsg().
8787 * cmsg_level cmsg_type cmsg_data[]
8788 * ------------ ------------ ----------------------
8789 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8791 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8794 cmsgs->srinfo = CMSG_DATA(cmsg);
8796 if (cmsgs->srinfo->sinfo_flags &
8797 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8798 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8799 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8804 /* SCTP Socket API Extension
8805 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8807 * This cmsghdr structure specifies SCTP options for
8808 * sendmsg(). This structure and SCTP_RCVINFO replaces
8809 * SCTP_SNDRCV which has been deprecated.
8811 * cmsg_level cmsg_type cmsg_data[]
8812 * ------------ ------------ ---------------------
8813 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8815 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8818 cmsgs->sinfo = CMSG_DATA(cmsg);
8820 if (cmsgs->sinfo->snd_flags &
8821 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8822 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8823 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8827 /* SCTP Socket API Extension
8828 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8830 * This cmsghdr structure specifies SCTP options for sendmsg().
8832 * cmsg_level cmsg_type cmsg_data[]
8833 * ------------ ------------ ---------------------
8834 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8836 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8839 cmsgs->prinfo = CMSG_DATA(cmsg);
8840 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8843 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8844 cmsgs->prinfo->pr_value = 0;
8847 /* SCTP Socket API Extension
8848 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8850 * This cmsghdr structure specifies SCTP options for sendmsg().
8852 * cmsg_level cmsg_type cmsg_data[]
8853 * ------------ ------------ ---------------------
8854 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8856 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8859 cmsgs->authinfo = CMSG_DATA(cmsg);
8861 case SCTP_DSTADDRV4:
8862 case SCTP_DSTADDRV6:
8863 /* SCTP Socket API Extension
8864 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8866 * This cmsghdr structure specifies SCTP options for sendmsg().
8868 * cmsg_level cmsg_type cmsg_data[]
8869 * ------------ ------------ ---------------------
8870 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8871 * ------------ ------------ ---------------------
8872 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8874 cmsgs->addrs_msg = my_msg;
8885 * Wait for a packet..
8886 * Note: This function is the same function as in core/datagram.c
8887 * with a few modifications to make lksctp work.
8889 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8894 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8896 /* Socket errors? */
8897 error = sock_error(sk);
8901 if (!skb_queue_empty(&sk->sk_receive_queue))
8904 /* Socket shut down? */
8905 if (sk->sk_shutdown & RCV_SHUTDOWN)
8908 /* Sequenced packets can come disconnected. If so we report the
8913 /* Is there a good reason to think that we may receive some data? */
8914 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8917 /* Handle signals. */
8918 if (signal_pending(current))
8921 /* Let another process have a go. Since we are going to sleep
8922 * anyway. Note: This may cause odd behaviors if the message
8923 * does not fit in the user's buffer, but this seems to be the
8924 * only way to honor MSG_DONTWAIT realistically.
8927 *timeo_p = schedule_timeout(*timeo_p);
8931 finish_wait(sk_sleep(sk), &wait);
8935 error = sock_intr_errno(*timeo_p);
8938 finish_wait(sk_sleep(sk), &wait);
8943 /* Receive a datagram.
8944 * Note: This is pretty much the same routine as in core/datagram.c
8945 * with a few changes to make lksctp work.
8947 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8948 int noblock, int *err)
8951 struct sk_buff *skb;
8954 timeo = sock_rcvtimeo(sk, noblock);
8956 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8957 MAX_SCHEDULE_TIMEOUT);
8960 /* Again only user level code calls this function,
8961 * so nothing interrupt level
8962 * will suddenly eat the receive_queue.
8964 * Look at current nfs client by the way...
8965 * However, this function was correct in any case. 8)
8967 if (flags & MSG_PEEK) {
8968 skb = skb_peek(&sk->sk_receive_queue);
8970 refcount_inc(&skb->users);
8972 skb = __skb_dequeue(&sk->sk_receive_queue);
8978 /* Caller is allowed not to check sk->sk_err before calling. */
8979 error = sock_error(sk);
8983 if (sk->sk_shutdown & RCV_SHUTDOWN)
8986 if (sk_can_busy_loop(sk)) {
8987 sk_busy_loop(sk, noblock);
8989 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8993 /* User doesn't want to wait. */
8997 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
9006 /* If sndbuf has changed, wake up per association sndbuf waiters. */
9007 static void __sctp_write_space(struct sctp_association *asoc)
9009 struct sock *sk = asoc->base.sk;
9011 if (sctp_wspace(asoc) <= 0)
9014 if (waitqueue_active(&asoc->wait))
9015 wake_up_interruptible(&asoc->wait);
9017 if (sctp_writeable(sk)) {
9018 struct socket_wq *wq;
9021 wq = rcu_dereference(sk->sk_wq);
9023 if (waitqueue_active(&wq->wait))
9024 wake_up_interruptible(&wq->wait);
9026 /* Note that we try to include the Async I/O support
9027 * here by modeling from the current TCP/UDP code.
9028 * We have not tested with it yet.
9030 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9031 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9037 static void sctp_wake_up_waiters(struct sock *sk,
9038 struct sctp_association *asoc)
9040 struct sctp_association *tmp = asoc;
9042 /* We do accounting for the sndbuf space per association,
9043 * so we only need to wake our own association.
9045 if (asoc->ep->sndbuf_policy)
9046 return __sctp_write_space(asoc);
9048 /* If association goes down and is just flushing its
9049 * outq, then just normally notify others.
9051 if (asoc->base.dead)
9052 return sctp_write_space(sk);
9054 /* Accounting for the sndbuf space is per socket, so we
9055 * need to wake up others, try to be fair and in case of
9056 * other associations, let them have a go first instead
9057 * of just doing a sctp_write_space() call.
9059 * Note that we reach sctp_wake_up_waiters() only when
9060 * associations free up queued chunks, thus we are under
9061 * lock and the list of associations on a socket is
9062 * guaranteed not to change.
9064 for (tmp = list_next_entry(tmp, asocs); 1;
9065 tmp = list_next_entry(tmp, asocs)) {
9066 /* Manually skip the head element. */
9067 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9069 /* Wake up association. */
9070 __sctp_write_space(tmp);
9071 /* We've reached the end. */
9077 /* Do accounting for the sndbuf space.
9078 * Decrement the used sndbuf space of the corresponding association by the
9079 * data size which was just transmitted(freed).
9081 static void sctp_wfree(struct sk_buff *skb)
9083 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9084 struct sctp_association *asoc = chunk->asoc;
9085 struct sock *sk = asoc->base.sk;
9087 sk_mem_uncharge(sk, skb->truesize);
9088 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
9089 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9090 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9091 &sk->sk_wmem_alloc));
9094 struct sctp_shared_key *shkey = chunk->shkey;
9096 /* refcnt == 2 and !list_empty mean after this release, it's
9097 * not being used anywhere, and it's time to notify userland
9098 * that this shkey can be freed if it's been deactivated.
9100 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9101 refcount_read(&shkey->refcnt) == 2) {
9102 struct sctp_ulpevent *ev;
9104 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9108 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9110 sctp_auth_shkey_release(chunk->shkey);
9114 sctp_wake_up_waiters(sk, asoc);
9116 sctp_association_put(asoc);
9119 /* Do accounting for the receive space on the socket.
9120 * Accounting for the association is done in ulpevent.c
9121 * We set this as a destructor for the cloned data skbs so that
9122 * accounting is done at the correct time.
9124 void sctp_sock_rfree(struct sk_buff *skb)
9126 struct sock *sk = skb->sk;
9127 struct sctp_ulpevent *event = sctp_skb2event(skb);
9129 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9132 * Mimic the behavior of sock_rfree
9134 sk_mem_uncharge(sk, event->rmem_len);
9138 /* Helper function to wait for space in the sndbuf. */
9139 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9142 struct sock *sk = asoc->base.sk;
9143 long current_timeo = *timeo_p;
9147 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9150 /* Increment the association's refcnt. */
9151 sctp_association_hold(asoc);
9153 /* Wait on the association specific sndbuf space. */
9155 prepare_to_wait_exclusive(&asoc->wait, &wait,
9156 TASK_INTERRUPTIBLE);
9157 if (asoc->base.dead)
9161 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9163 if (signal_pending(current))
9164 goto do_interrupted;
9165 if (sk_under_memory_pressure(sk))
9167 if ((int)msg_len <= sctp_wspace(asoc) &&
9168 sk_wmem_schedule(sk, msg_len))
9171 /* Let another process have a go. Since we are going
9175 current_timeo = schedule_timeout(current_timeo);
9177 if (sk != asoc->base.sk)
9180 *timeo_p = current_timeo;
9184 finish_wait(&asoc->wait, &wait);
9186 /* Release the association's refcnt. */
9187 sctp_association_put(asoc);
9200 err = sock_intr_errno(*timeo_p);
9208 void sctp_data_ready(struct sock *sk)
9210 struct socket_wq *wq;
9213 wq = rcu_dereference(sk->sk_wq);
9214 if (skwq_has_sleeper(wq))
9215 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9216 EPOLLRDNORM | EPOLLRDBAND);
9217 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9221 /* If socket sndbuf has changed, wake up all per association waiters. */
9222 void sctp_write_space(struct sock *sk)
9224 struct sctp_association *asoc;
9226 /* Wake up the tasks in each wait queue. */
9227 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9228 __sctp_write_space(asoc);
9232 /* Is there any sndbuf space available on the socket?
9234 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9235 * associations on the same socket. For a UDP-style socket with
9236 * multiple associations, it is possible for it to be "unwriteable"
9237 * prematurely. I assume that this is acceptable because
9238 * a premature "unwriteable" is better than an accidental "writeable" which
9239 * would cause an unwanted block under certain circumstances. For the 1-1
9240 * UDP-style sockets or TCP-style sockets, this code should work.
9243 static bool sctp_writeable(struct sock *sk)
9245 return sk->sk_sndbuf > sk->sk_wmem_queued;
9248 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9249 * returns immediately with EINPROGRESS.
9251 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9253 struct sock *sk = asoc->base.sk;
9255 long current_timeo = *timeo_p;
9258 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9260 /* Increment the association's refcnt. */
9261 sctp_association_hold(asoc);
9264 prepare_to_wait_exclusive(&asoc->wait, &wait,
9265 TASK_INTERRUPTIBLE);
9268 if (sk->sk_shutdown & RCV_SHUTDOWN)
9270 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9273 if (signal_pending(current))
9274 goto do_interrupted;
9276 if (sctp_state(asoc, ESTABLISHED))
9279 /* Let another process have a go. Since we are going
9283 current_timeo = schedule_timeout(current_timeo);
9286 *timeo_p = current_timeo;
9290 finish_wait(&asoc->wait, &wait);
9292 /* Release the association's refcnt. */
9293 sctp_association_put(asoc);
9298 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9301 err = -ECONNREFUSED;
9305 err = sock_intr_errno(*timeo_p);
9313 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9315 struct sctp_endpoint *ep;
9319 ep = sctp_sk(sk)->ep;
9323 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9324 TASK_INTERRUPTIBLE);
9326 if (list_empty(&ep->asocs)) {
9328 timeo = schedule_timeout(timeo);
9333 if (!sctp_sstate(sk, LISTENING))
9337 if (!list_empty(&ep->asocs))
9340 err = sock_intr_errno(timeo);
9341 if (signal_pending(current))
9349 finish_wait(sk_sleep(sk), &wait);
9354 static void sctp_wait_for_close(struct sock *sk, long timeout)
9359 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9360 if (list_empty(&sctp_sk(sk)->ep->asocs))
9363 timeout = schedule_timeout(timeout);
9365 } while (!signal_pending(current) && timeout);
9367 finish_wait(sk_sleep(sk), &wait);
9370 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9372 struct sk_buff *frag;
9377 /* Don't forget the fragments. */
9378 skb_walk_frags(skb, frag)
9379 sctp_skb_set_owner_r_frag(frag, sk);
9382 sctp_skb_set_owner_r(skb, sk);
9385 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9386 struct sctp_association *asoc)
9388 struct inet_sock *inet = inet_sk(sk);
9389 struct inet_sock *newinet;
9390 struct sctp_sock *sp = sctp_sk(sk);
9391 struct sctp_endpoint *ep = sp->ep;
9393 newsk->sk_type = sk->sk_type;
9394 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9395 newsk->sk_flags = sk->sk_flags;
9396 newsk->sk_tsflags = sk->sk_tsflags;
9397 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9398 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9399 newsk->sk_reuse = sk->sk_reuse;
9400 sctp_sk(newsk)->reuse = sp->reuse;
9402 newsk->sk_shutdown = sk->sk_shutdown;
9403 newsk->sk_destruct = sctp_destruct_sock;
9404 newsk->sk_family = sk->sk_family;
9405 newsk->sk_protocol = IPPROTO_SCTP;
9406 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9407 newsk->sk_sndbuf = sk->sk_sndbuf;
9408 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9409 newsk->sk_lingertime = sk->sk_lingertime;
9410 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9411 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9412 newsk->sk_rxhash = sk->sk_rxhash;
9414 newinet = inet_sk(newsk);
9416 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9417 * getsockname() and getpeername()
9419 newinet->inet_sport = inet->inet_sport;
9420 newinet->inet_saddr = inet->inet_saddr;
9421 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9422 newinet->inet_dport = htons(asoc->peer.port);
9423 newinet->pmtudisc = inet->pmtudisc;
9424 newinet->inet_id = prandom_u32();
9426 newinet->uc_ttl = inet->uc_ttl;
9427 newinet->mc_loop = 1;
9428 newinet->mc_ttl = 1;
9429 newinet->mc_index = 0;
9430 newinet->mc_list = NULL;
9432 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9433 net_enable_timestamp();
9435 /* Set newsk security attributes from orginal sk and connection
9436 * security attribute from ep.
9438 security_sctp_sk_clone(ep, sk, newsk);
9441 static inline void sctp_copy_descendant(struct sock *sk_to,
9442 const struct sock *sk_from)
9444 int ancestor_size = sizeof(struct inet_sock) +
9445 sizeof(struct sctp_sock) -
9446 offsetof(struct sctp_sock, pd_lobby);
9448 if (sk_from->sk_family == PF_INET6)
9449 ancestor_size += sizeof(struct ipv6_pinfo);
9451 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9454 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9455 * and its messages to the newsk.
9457 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9458 struct sctp_association *assoc,
9459 enum sctp_socket_type type)
9461 struct sctp_sock *oldsp = sctp_sk(oldsk);
9462 struct sctp_sock *newsp = sctp_sk(newsk);
9463 struct sctp_bind_bucket *pp; /* hash list port iterator */
9464 struct sctp_endpoint *newep = newsp->ep;
9465 struct sk_buff *skb, *tmp;
9466 struct sctp_ulpevent *event;
9467 struct sctp_bind_hashbucket *head;
9470 /* Migrate socket buffer sizes and all the socket level options to the
9473 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9474 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9475 /* Brute force copy old sctp opt. */
9476 sctp_copy_descendant(newsk, oldsk);
9478 /* Restore the ep value that was overwritten with the above structure
9484 /* Hook this new socket in to the bind_hash list. */
9485 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9486 inet_sk(oldsk)->inet_num)];
9487 spin_lock_bh(&head->lock);
9488 pp = sctp_sk(oldsk)->bind_hash;
9489 sk_add_bind_node(newsk, &pp->owner);
9490 sctp_sk(newsk)->bind_hash = pp;
9491 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9492 spin_unlock_bh(&head->lock);
9494 /* Copy the bind_addr list from the original endpoint to the new
9495 * endpoint so that we can handle restarts properly
9497 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9498 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9502 /* New ep's auth_hmacs should be set if old ep's is set, in case
9503 * that net->sctp.auth_enable has been changed to 0 by users and
9504 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9506 if (oldsp->ep->auth_hmacs) {
9507 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9512 /* Move any messages in the old socket's receive queue that are for the
9513 * peeled off association to the new socket's receive queue.
9515 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9516 event = sctp_skb2event(skb);
9517 if (event->asoc == assoc) {
9518 __skb_unlink(skb, &oldsk->sk_receive_queue);
9519 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9520 sctp_skb_set_owner_r_frag(skb, newsk);
9524 /* Clean up any messages pending delivery due to partial
9525 * delivery. Three cases:
9526 * 1) No partial deliver; no work.
9527 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9528 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9530 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9532 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9533 struct sk_buff_head *queue;
9535 /* Decide which queue to move pd_lobby skbs to. */
9536 if (assoc->ulpq.pd_mode) {
9537 queue = &newsp->pd_lobby;
9539 queue = &newsk->sk_receive_queue;
9541 /* Walk through the pd_lobby, looking for skbs that
9542 * need moved to the new socket.
9544 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9545 event = sctp_skb2event(skb);
9546 if (event->asoc == assoc) {
9547 __skb_unlink(skb, &oldsp->pd_lobby);
9548 __skb_queue_tail(queue, skb);
9549 sctp_skb_set_owner_r_frag(skb, newsk);
9553 /* Clear up any skbs waiting for the partial
9554 * delivery to finish.
9556 if (assoc->ulpq.pd_mode)
9557 sctp_clear_pd(oldsk, NULL);
9561 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9563 /* Set the type of socket to indicate that it is peeled off from the
9564 * original UDP-style socket or created with the accept() call on a
9565 * TCP-style socket..
9569 /* Mark the new socket "in-use" by the user so that any packets
9570 * that may arrive on the association after we've moved it are
9571 * queued to the backlog. This prevents a potential race between
9572 * backlog processing on the old socket and new-packet processing
9573 * on the new socket.
9575 * The caller has just allocated newsk so we can guarantee that other
9576 * paths won't try to lock it and then oldsk.
9578 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9579 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9580 sctp_assoc_migrate(assoc, newsk);
9581 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9583 /* If the association on the newsk is already closed before accept()
9584 * is called, set RCV_SHUTDOWN flag.
9586 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9587 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9588 newsk->sk_shutdown |= RCV_SHUTDOWN;
9590 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9593 release_sock(newsk);
9599 /* This proto struct describes the ULP interface for SCTP. */
9600 struct proto sctp_prot = {
9602 .owner = THIS_MODULE,
9603 .close = sctp_close,
9604 .disconnect = sctp_disconnect,
9605 .accept = sctp_accept,
9606 .ioctl = sctp_ioctl,
9607 .init = sctp_init_sock,
9608 .destroy = sctp_destroy_sock,
9609 .shutdown = sctp_shutdown,
9610 .setsockopt = sctp_setsockopt,
9611 .getsockopt = sctp_getsockopt,
9612 .sendmsg = sctp_sendmsg,
9613 .recvmsg = sctp_recvmsg,
9615 .backlog_rcv = sctp_backlog_rcv,
9617 .unhash = sctp_unhash,
9618 .no_autobind = true,
9619 .obj_size = sizeof(struct sctp_sock),
9620 .useroffset = offsetof(struct sctp_sock, subscribe),
9621 .usersize = offsetof(struct sctp_sock, initmsg) -
9622 offsetof(struct sctp_sock, subscribe) +
9623 sizeof_field(struct sctp_sock, initmsg),
9624 .sysctl_mem = sysctl_sctp_mem,
9625 .sysctl_rmem = sysctl_sctp_rmem,
9626 .sysctl_wmem = sysctl_sctp_wmem,
9627 .memory_pressure = &sctp_memory_pressure,
9628 .enter_memory_pressure = sctp_enter_memory_pressure,
9629 .memory_allocated = &sctp_memory_allocated,
9630 .sockets_allocated = &sctp_sockets_allocated,
9633 #if IS_ENABLED(CONFIG_IPV6)
9635 #include <net/transp_v6.h>
9636 static void sctp_v6_destroy_sock(struct sock *sk)
9638 sctp_destroy_sock(sk);
9639 inet6_destroy_sock(sk);
9642 struct proto sctpv6_prot = {
9644 .owner = THIS_MODULE,
9645 .close = sctp_close,
9646 .disconnect = sctp_disconnect,
9647 .accept = sctp_accept,
9648 .ioctl = sctp_ioctl,
9649 .init = sctp_init_sock,
9650 .destroy = sctp_v6_destroy_sock,
9651 .shutdown = sctp_shutdown,
9652 .setsockopt = sctp_setsockopt,
9653 .getsockopt = sctp_getsockopt,
9654 .sendmsg = sctp_sendmsg,
9655 .recvmsg = sctp_recvmsg,
9657 .backlog_rcv = sctp_backlog_rcv,
9659 .unhash = sctp_unhash,
9660 .no_autobind = true,
9661 .obj_size = sizeof(struct sctp6_sock),
9662 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9663 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9664 offsetof(struct sctp6_sock, sctp.subscribe) +
9665 sizeof_field(struct sctp6_sock, sctp.initmsg),
9666 .sysctl_mem = sysctl_sctp_mem,
9667 .sysctl_rmem = sysctl_sctp_rmem,
9668 .sysctl_wmem = sysctl_sctp_wmem,
9669 .memory_pressure = &sctp_memory_pressure,
9670 .enter_memory_pressure = sctp_enter_memory_pressure,
9671 .memory_allocated = &sctp_memory_allocated,
9672 .sockets_allocated = &sctp_sockets_allocated,
9674 #endif /* IS_ENABLED(CONFIG_IPV6) */