1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
38 * Written or modified by:
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
72 #include <net/route.h>
74 #include <net/inet_common.h>
75 #include <net/busy_poll.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <linux/export.h>
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
82 #include <net/sctp/stream_sched.h>
84 /* Forward declarations for internal helper functions. */
85 static int sctp_writeable(struct sock *sk);
86 static void sctp_wfree(struct sk_buff *skb);
87 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
89 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
90 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
91 static int sctp_wait_for_accept(struct sock *sk, long timeo);
92 static void sctp_wait_for_close(struct sock *sk, long timeo);
93 static void sctp_destruct_sock(struct sock *sk);
94 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
95 union sctp_addr *addr, int len);
96 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
97 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
99 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf(struct sctp_association *asoc,
101 struct sctp_chunk *chunk);
102 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
103 static int sctp_autobind(struct sock *sk);
104 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
105 struct sctp_association *assoc,
106 enum sctp_socket_type type);
108 static unsigned long sctp_memory_pressure;
109 static atomic_long_t sctp_memory_allocated;
110 struct percpu_counter sctp_sockets_allocated;
112 static void sctp_enter_memory_pressure(struct sock *sk)
114 sctp_memory_pressure = 1;
118 /* Get the sndbuf space available at the time on the association. */
119 static inline int sctp_wspace(struct sctp_association *asoc)
123 if (asoc->ep->sndbuf_policy)
124 amt = asoc->sndbuf_used;
126 amt = sk_wmem_alloc_get(asoc->base.sk);
128 if (amt >= asoc->base.sk->sk_sndbuf) {
129 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
132 amt = sk_stream_wspace(asoc->base.sk);
137 amt = asoc->base.sk->sk_sndbuf - amt;
142 /* Increment the used sndbuf space count of the corresponding association by
143 * the size of the outgoing data chunk.
144 * Also, set the skb destructor for sndbuf accounting later.
146 * Since it is always 1-1 between chunk and skb, and also a new skb is always
147 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
148 * destructor in the data chunk skb for the purpose of the sndbuf space
151 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
153 struct sctp_association *asoc = chunk->asoc;
154 struct sock *sk = asoc->base.sk;
156 /* The sndbuf space is tracked per association. */
157 sctp_association_hold(asoc);
160 sctp_auth_shkey_hold(chunk->shkey);
162 skb_set_owner_w(chunk->skb, sk);
164 chunk->skb->destructor = sctp_wfree;
165 /* Save the chunk pointer in skb for sctp_wfree to use later. */
166 skb_shinfo(chunk->skb)->destructor_arg = chunk;
168 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
169 sizeof(struct sk_buff) +
170 sizeof(struct sctp_chunk);
172 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
173 sk->sk_wmem_queued += chunk->skb->truesize;
174 sk_mem_charge(sk, chunk->skb->truesize);
177 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
179 skb_orphan(chunk->skb);
182 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
183 void (*cb)(struct sctp_chunk *))
186 struct sctp_outq *q = &asoc->outqueue;
187 struct sctp_transport *t;
188 struct sctp_chunk *chunk;
190 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
191 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
194 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
197 list_for_each_entry(chunk, &q->sacked, transmitted_list)
200 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
203 list_for_each_entry(chunk, &q->out_chunk_list, list)
207 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
208 void (*cb)(struct sk_buff *, struct sock *))
211 struct sk_buff *skb, *tmp;
213 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
216 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
219 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
223 /* Verify that this is a valid address. */
224 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
229 /* Verify basic sockaddr. */
230 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
234 /* Is this a valid SCTP address? */
235 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
238 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
244 /* Look up the association by its id. If this is not a UDP-style
245 * socket, the ID field is always ignored.
247 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
249 struct sctp_association *asoc = NULL;
251 /* If this is not a UDP-style socket, assoc id should be ignored. */
252 if (!sctp_style(sk, UDP)) {
253 /* Return NULL if the socket state is not ESTABLISHED. It
254 * could be a TCP-style listening socket or a socket which
255 * hasn't yet called connect() to establish an association.
257 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
260 /* Get the first and the only association from the list. */
261 if (!list_empty(&sctp_sk(sk)->ep->asocs))
262 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
263 struct sctp_association, asocs);
267 /* Otherwise this is a UDP-style socket. */
268 if (!id || (id == (sctp_assoc_t)-1))
271 spin_lock_bh(&sctp_assocs_id_lock);
272 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
273 spin_unlock_bh(&sctp_assocs_id_lock);
275 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
281 /* Look up the transport from an address and an assoc id. If both address and
282 * id are specified, the associations matching the address and the id should be
285 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
286 struct sockaddr_storage *addr,
289 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
290 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
291 union sctp_addr *laddr = (union sctp_addr *)addr;
292 struct sctp_transport *transport;
294 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
297 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
304 id_asoc = sctp_id2assoc(sk, id);
305 if (id_asoc && (id_asoc != addr_asoc))
308 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
309 (union sctp_addr *)addr);
314 /* API 3.1.2 bind() - UDP Style Syntax
315 * The syntax of bind() is,
317 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
319 * sd - the socket descriptor returned by socket().
320 * addr - the address structure (struct sockaddr_in or struct
321 * sockaddr_in6 [RFC 2553]),
322 * addr_len - the size of the address structure.
324 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
330 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
333 /* Disallow binding twice. */
334 if (!sctp_sk(sk)->ep->base.bind_addr.port)
335 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
345 static long sctp_get_port_local(struct sock *, union sctp_addr *);
347 /* Verify this is a valid sockaddr. */
348 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
349 union sctp_addr *addr, int len)
353 /* Check minimum size. */
354 if (len < sizeof (struct sockaddr))
357 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
360 if (addr->sa.sa_family == AF_INET6) {
361 if (len < SIN6_LEN_RFC2133)
363 /* V4 mapped address are really of AF_INET family */
364 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
365 !opt->pf->af_supported(AF_INET, opt))
369 /* If we get this far, af is valid. */
370 af = sctp_get_af_specific(addr->sa.sa_family);
372 if (len < af->sockaddr_len)
378 /* Bind a local address either to an endpoint or to an association. */
379 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
381 struct net *net = sock_net(sk);
382 struct sctp_sock *sp = sctp_sk(sk);
383 struct sctp_endpoint *ep = sp->ep;
384 struct sctp_bind_addr *bp = &ep->base.bind_addr;
389 /* Common sockaddr verification. */
390 af = sctp_sockaddr_af(sp, addr, len);
392 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
393 __func__, sk, addr, len);
397 snum = ntohs(addr->v4.sin_port);
399 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
400 __func__, sk, &addr->sa, bp->port, snum, len);
402 /* PF specific bind() address verification. */
403 if (!sp->pf->bind_verify(sp, addr))
404 return -EADDRNOTAVAIL;
406 /* We must either be unbound, or bind to the same port.
407 * It's OK to allow 0 ports if we are already bound.
408 * We'll just inhert an already bound port in this case
413 else if (snum != bp->port) {
414 pr_debug("%s: new port %d doesn't match existing port "
415 "%d\n", __func__, snum, bp->port);
420 if (snum && snum < inet_prot_sock(net) &&
421 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
424 /* See if the address matches any of the addresses we may have
425 * already bound before checking against other endpoints.
427 if (sctp_bind_addr_match(bp, addr, sp))
430 /* Make sure we are allowed to bind here.
431 * The function sctp_get_port_local() does duplicate address
434 addr->v4.sin_port = htons(snum);
435 if ((ret = sctp_get_port_local(sk, addr))) {
439 /* Refresh ephemeral port. */
441 bp->port = inet_sk(sk)->inet_num;
443 /* Add the address to the bind address list.
444 * Use GFP_ATOMIC since BHs will be disabled.
446 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
447 SCTP_ADDR_SRC, GFP_ATOMIC);
449 /* Copy back into socket for getsockname() use. */
451 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
452 sp->pf->to_sk_saddr(addr, sk);
458 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
460 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
461 * at any one time. If a sender, after sending an ASCONF chunk, decides
462 * it needs to transfer another ASCONF Chunk, it MUST wait until the
463 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
464 * subsequent ASCONF. Note this restriction binds each side, so at any
465 * time two ASCONF may be in-transit on any given association (one sent
466 * from each endpoint).
468 static int sctp_send_asconf(struct sctp_association *asoc,
469 struct sctp_chunk *chunk)
471 struct net *net = sock_net(asoc->base.sk);
474 /* If there is an outstanding ASCONF chunk, queue it for later
477 if (asoc->addip_last_asconf) {
478 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
482 /* Hold the chunk until an ASCONF_ACK is received. */
483 sctp_chunk_hold(chunk);
484 retval = sctp_primitive_ASCONF(net, asoc, chunk);
486 sctp_chunk_free(chunk);
488 asoc->addip_last_asconf = chunk;
494 /* Add a list of addresses as bind addresses to local endpoint or
497 * Basically run through each address specified in the addrs/addrcnt
498 * array/length pair, determine if it is IPv6 or IPv4 and call
499 * sctp_do_bind() on it.
501 * If any of them fails, then the operation will be reversed and the
502 * ones that were added will be removed.
504 * Only sctp_setsockopt_bindx() is supposed to call this function.
506 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
511 struct sockaddr *sa_addr;
514 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
518 for (cnt = 0; cnt < addrcnt; cnt++) {
519 /* The list may contain either IPv4 or IPv6 address;
520 * determine the address length for walking thru the list.
523 af = sctp_get_af_specific(sa_addr->sa_family);
529 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
532 addr_buf += af->sockaddr_len;
536 /* Failed. Cleanup the ones that have been added */
538 sctp_bindx_rem(sk, addrs, cnt);
546 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
547 * associations that are part of the endpoint indicating that a list of local
548 * addresses are added to the endpoint.
550 * If any of the addresses is already in the bind address list of the
551 * association, we do not send the chunk for that association. But it will not
552 * affect other associations.
554 * Only sctp_setsockopt_bindx() is supposed to call this function.
556 static int sctp_send_asconf_add_ip(struct sock *sk,
557 struct sockaddr *addrs,
560 struct net *net = sock_net(sk);
561 struct sctp_sock *sp;
562 struct sctp_endpoint *ep;
563 struct sctp_association *asoc;
564 struct sctp_bind_addr *bp;
565 struct sctp_chunk *chunk;
566 struct sctp_sockaddr_entry *laddr;
567 union sctp_addr *addr;
568 union sctp_addr saveaddr;
575 if (!net->sctp.addip_enable)
581 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
582 __func__, sk, addrs, addrcnt);
584 list_for_each_entry(asoc, &ep->asocs, asocs) {
585 if (!asoc->peer.asconf_capable)
588 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
591 if (!sctp_state(asoc, ESTABLISHED))
594 /* Check if any address in the packed array of addresses is
595 * in the bind address list of the association. If so,
596 * do not send the asconf chunk to its peer, but continue with
597 * other associations.
600 for (i = 0; i < addrcnt; i++) {
602 af = sctp_get_af_specific(addr->v4.sin_family);
608 if (sctp_assoc_lookup_laddr(asoc, addr))
611 addr_buf += af->sockaddr_len;
616 /* Use the first valid address in bind addr list of
617 * association as Address Parameter of ASCONF CHUNK.
619 bp = &asoc->base.bind_addr;
620 p = bp->address_list.next;
621 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
622 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
623 addrcnt, SCTP_PARAM_ADD_IP);
629 /* Add the new addresses to the bind address list with
630 * use_as_src set to 0.
633 for (i = 0; i < addrcnt; i++) {
635 af = sctp_get_af_specific(addr->v4.sin_family);
636 memcpy(&saveaddr, addr, af->sockaddr_len);
637 retval = sctp_add_bind_addr(bp, &saveaddr,
639 SCTP_ADDR_NEW, GFP_ATOMIC);
640 addr_buf += af->sockaddr_len;
642 if (asoc->src_out_of_asoc_ok) {
643 struct sctp_transport *trans;
645 list_for_each_entry(trans,
646 &asoc->peer.transport_addr_list, transports) {
647 /* Clear the source and route cache */
648 sctp_transport_dst_release(trans);
649 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
650 2*asoc->pathmtu, 4380));
651 trans->ssthresh = asoc->peer.i.a_rwnd;
652 trans->rto = asoc->rto_initial;
653 sctp_max_rto(asoc, trans);
654 trans->rtt = trans->srtt = trans->rttvar = 0;
655 sctp_transport_route(trans, NULL,
656 sctp_sk(asoc->base.sk));
659 retval = sctp_send_asconf(asoc, chunk);
666 /* Remove a list of addresses from bind addresses list. Do not remove the
669 * Basically run through each address specified in the addrs/addrcnt
670 * array/length pair, determine if it is IPv6 or IPv4 and call
671 * sctp_del_bind() on it.
673 * If any of them fails, then the operation will be reversed and the
674 * ones that were removed will be added back.
676 * At least one address has to be left; if only one address is
677 * available, the operation will return -EBUSY.
679 * Only sctp_setsockopt_bindx() is supposed to call this function.
681 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
683 struct sctp_sock *sp = sctp_sk(sk);
684 struct sctp_endpoint *ep = sp->ep;
686 struct sctp_bind_addr *bp = &ep->base.bind_addr;
689 union sctp_addr *sa_addr;
692 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
693 __func__, sk, addrs, addrcnt);
696 for (cnt = 0; cnt < addrcnt; cnt++) {
697 /* If the bind address list is empty or if there is only one
698 * bind address, there is nothing more to be removed (we need
699 * at least one address here).
701 if (list_empty(&bp->address_list) ||
702 (sctp_list_single_entry(&bp->address_list))) {
708 af = sctp_get_af_specific(sa_addr->sa.sa_family);
714 if (!af->addr_valid(sa_addr, sp, NULL)) {
715 retval = -EADDRNOTAVAIL;
719 if (sa_addr->v4.sin_port &&
720 sa_addr->v4.sin_port != htons(bp->port)) {
725 if (!sa_addr->v4.sin_port)
726 sa_addr->v4.sin_port = htons(bp->port);
728 /* FIXME - There is probably a need to check if sk->sk_saddr and
729 * sk->sk_rcv_addr are currently set to one of the addresses to
730 * be removed. This is something which needs to be looked into
731 * when we are fixing the outstanding issues with multi-homing
732 * socket routing and failover schemes. Refer to comments in
733 * sctp_do_bind(). -daisy
735 retval = sctp_del_bind_addr(bp, sa_addr);
737 addr_buf += af->sockaddr_len;
740 /* Failed. Add the ones that has been removed back */
742 sctp_bindx_add(sk, addrs, cnt);
750 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
751 * the associations that are part of the endpoint indicating that a list of
752 * local addresses are removed from the endpoint.
754 * If any of the addresses is already in the bind address list of the
755 * association, we do not send the chunk for that association. But it will not
756 * affect other associations.
758 * Only sctp_setsockopt_bindx() is supposed to call this function.
760 static int sctp_send_asconf_del_ip(struct sock *sk,
761 struct sockaddr *addrs,
764 struct net *net = sock_net(sk);
765 struct sctp_sock *sp;
766 struct sctp_endpoint *ep;
767 struct sctp_association *asoc;
768 struct sctp_transport *transport;
769 struct sctp_bind_addr *bp;
770 struct sctp_chunk *chunk;
771 union sctp_addr *laddr;
774 struct sctp_sockaddr_entry *saddr;
780 if (!net->sctp.addip_enable)
786 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
787 __func__, sk, addrs, addrcnt);
789 list_for_each_entry(asoc, &ep->asocs, asocs) {
791 if (!asoc->peer.asconf_capable)
794 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
797 if (!sctp_state(asoc, ESTABLISHED))
800 /* Check if any address in the packed array of addresses is
801 * not present in the bind address list of the association.
802 * If so, do not send the asconf chunk to its peer, but
803 * continue with other associations.
806 for (i = 0; i < addrcnt; i++) {
808 af = sctp_get_af_specific(laddr->v4.sin_family);
814 if (!sctp_assoc_lookup_laddr(asoc, laddr))
817 addr_buf += af->sockaddr_len;
822 /* Find one address in the association's bind address list
823 * that is not in the packed array of addresses. This is to
824 * make sure that we do not delete all the addresses in the
827 bp = &asoc->base.bind_addr;
828 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
830 if ((laddr == NULL) && (addrcnt == 1)) {
831 if (asoc->asconf_addr_del_pending)
833 asoc->asconf_addr_del_pending =
834 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
835 if (asoc->asconf_addr_del_pending == NULL) {
839 asoc->asconf_addr_del_pending->sa.sa_family =
841 asoc->asconf_addr_del_pending->v4.sin_port =
843 if (addrs->sa_family == AF_INET) {
844 struct sockaddr_in *sin;
846 sin = (struct sockaddr_in *)addrs;
847 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
848 } else if (addrs->sa_family == AF_INET6) {
849 struct sockaddr_in6 *sin6;
851 sin6 = (struct sockaddr_in6 *)addrs;
852 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
855 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
856 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
857 asoc->asconf_addr_del_pending);
859 asoc->src_out_of_asoc_ok = 1;
867 /* We do not need RCU protection throughout this loop
868 * because this is done under a socket lock from the
871 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
879 /* Reset use_as_src flag for the addresses in the bind address
880 * list that are to be deleted.
883 for (i = 0; i < addrcnt; i++) {
885 af = sctp_get_af_specific(laddr->v4.sin_family);
886 list_for_each_entry(saddr, &bp->address_list, list) {
887 if (sctp_cmp_addr_exact(&saddr->a, laddr))
888 saddr->state = SCTP_ADDR_DEL;
890 addr_buf += af->sockaddr_len;
893 /* Update the route and saddr entries for all the transports
894 * as some of the addresses in the bind address list are
895 * about to be deleted and cannot be used as source addresses.
897 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
899 sctp_transport_dst_release(transport);
900 sctp_transport_route(transport, NULL,
901 sctp_sk(asoc->base.sk));
905 /* We don't need to transmit ASCONF */
907 retval = sctp_send_asconf(asoc, chunk);
913 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
914 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
916 struct sock *sk = sctp_opt2sk(sp);
917 union sctp_addr *addr;
920 /* It is safe to write port space in caller. */
922 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
923 af = sctp_get_af_specific(addr->sa.sa_family);
926 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
929 if (addrw->state == SCTP_ADDR_NEW)
930 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
932 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
935 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
938 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
941 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
942 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
945 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
946 * Section 3.1.2 for this usage.
948 * addrs is a pointer to an array of one or more socket addresses. Each
949 * address is contained in its appropriate structure (i.e. struct
950 * sockaddr_in or struct sockaddr_in6) the family of the address type
951 * must be used to distinguish the address length (note that this
952 * representation is termed a "packed array" of addresses). The caller
953 * specifies the number of addresses in the array with addrcnt.
955 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
956 * -1, and sets errno to the appropriate error code.
958 * For SCTP, the port given in each socket address must be the same, or
959 * sctp_bindx() will fail, setting errno to EINVAL.
961 * The flags parameter is formed from the bitwise OR of zero or more of
962 * the following currently defined flags:
964 * SCTP_BINDX_ADD_ADDR
966 * SCTP_BINDX_REM_ADDR
968 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
969 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
970 * addresses from the association. The two flags are mutually exclusive;
971 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
972 * not remove all addresses from an association; sctp_bindx() will
973 * reject such an attempt with EINVAL.
975 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
976 * additional addresses with an endpoint after calling bind(). Or use
977 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
978 * socket is associated with so that no new association accepted will be
979 * associated with those addresses. If the endpoint supports dynamic
980 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
981 * endpoint to send the appropriate message to the peer to change the
982 * peers address lists.
984 * Adding and removing addresses from a connected association is
985 * optional functionality. Implementations that do not support this
986 * functionality should return EOPNOTSUPP.
988 * Basically do nothing but copying the addresses from user to kernel
989 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
990 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
993 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
996 * sk The sk of the socket
997 * addrs The pointer to the addresses in user land
998 * addrssize Size of the addrs buffer
999 * op Operation to perform (add or remove, see the flags of
1002 * Returns 0 if ok, <0 errno code on error.
1004 static int sctp_setsockopt_bindx(struct sock *sk,
1005 struct sockaddr __user *addrs,
1006 int addrs_size, int op)
1008 struct sockaddr *kaddrs;
1012 struct sockaddr *sa_addr;
1016 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1017 __func__, sk, addrs, addrs_size, op);
1019 if (unlikely(addrs_size <= 0))
1022 kaddrs = vmemdup_user(addrs, addrs_size);
1023 if (unlikely(IS_ERR(kaddrs)))
1024 return PTR_ERR(kaddrs);
1026 /* Walk through the addrs buffer and count the number of addresses. */
1028 while (walk_size < addrs_size) {
1029 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1035 af = sctp_get_af_specific(sa_addr->sa_family);
1037 /* If the address family is not supported or if this address
1038 * causes the address buffer to overflow return EINVAL.
1040 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1045 addr_buf += af->sockaddr_len;
1046 walk_size += af->sockaddr_len;
1051 case SCTP_BINDX_ADD_ADDR:
1052 /* Allow security module to validate bindx addresses. */
1053 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1054 (struct sockaddr *)kaddrs,
1058 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1061 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1064 case SCTP_BINDX_REM_ADDR:
1065 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1068 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1082 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1084 * Common routine for handling connect() and sctp_connectx().
1085 * Connect will come in with just a single address.
1087 static int __sctp_connect(struct sock *sk,
1088 struct sockaddr *kaddrs,
1090 sctp_assoc_t *assoc_id)
1092 struct net *net = sock_net(sk);
1093 struct sctp_sock *sp;
1094 struct sctp_endpoint *ep;
1095 struct sctp_association *asoc = NULL;
1096 struct sctp_association *asoc2;
1097 struct sctp_transport *transport;
1099 enum sctp_scope scope;
1104 union sctp_addr *sa_addr = NULL;
1106 unsigned short port;
1107 unsigned int f_flags = 0;
1112 /* connect() cannot be done on a socket that is already in ESTABLISHED
1113 * state - UDP-style peeled off socket or a TCP-style socket that
1114 * is already connected.
1115 * It cannot be done even on a TCP-style listening socket.
1117 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1118 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1123 /* Walk through the addrs buffer and count the number of addresses. */
1125 while (walk_size < addrs_size) {
1128 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1134 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1136 /* If the address family is not supported or if this address
1137 * causes the address buffer to overflow return EINVAL.
1139 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1144 port = ntohs(sa_addr->v4.sin_port);
1146 /* Save current address so we can work with it */
1147 memcpy(&to, sa_addr, af->sockaddr_len);
1149 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1153 /* Make sure the destination port is correctly set
1156 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1161 /* Check if there already is a matching association on the
1162 * endpoint (other than the one created here).
1164 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1165 if (asoc2 && asoc2 != asoc) {
1166 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1173 /* If we could not find a matching association on the endpoint,
1174 * make sure that there is no peeled-off association matching
1175 * the peer address even on another socket.
1177 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1178 err = -EADDRNOTAVAIL;
1183 /* If a bind() or sctp_bindx() is not called prior to
1184 * an sctp_connectx() call, the system picks an
1185 * ephemeral port and will choose an address set
1186 * equivalent to binding with a wildcard address.
1188 if (!ep->base.bind_addr.port) {
1189 if (sctp_autobind(sk)) {
1195 * If an unprivileged user inherits a 1-many
1196 * style socket with open associations on a
1197 * privileged port, it MAY be permitted to
1198 * accept new associations, but it SHOULD NOT
1199 * be permitted to open new associations.
1201 if (ep->base.bind_addr.port <
1202 inet_prot_sock(net) &&
1203 !ns_capable(net->user_ns,
1204 CAP_NET_BIND_SERVICE)) {
1210 scope = sctp_scope(&to);
1211 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1217 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1225 /* Prime the peer's transport structures. */
1226 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1234 addr_buf += af->sockaddr_len;
1235 walk_size += af->sockaddr_len;
1238 /* In case the user of sctp_connectx() wants an association
1239 * id back, assign one now.
1242 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1247 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1252 /* Initialize sk's dport and daddr for getpeername() */
1253 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1254 sp->pf->to_sk_daddr(sa_addr, sk);
1257 /* in-kernel sockets don't generally have a file allocated to them
1258 * if all they do is call sock_create_kern().
1260 if (sk->sk_socket->file)
1261 f_flags = sk->sk_socket->file->f_flags;
1263 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1266 *assoc_id = asoc->assoc_id;
1268 err = sctp_wait_for_connect(asoc, &timeo);
1269 /* Note: the asoc may be freed after the return of
1270 * sctp_wait_for_connect.
1273 /* Don't free association on exit. */
1277 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1278 __func__, asoc, kaddrs, err);
1281 /* sctp_primitive_ASSOCIATE may have added this association
1282 * To the hash table, try to unhash it, just in case, its a noop
1283 * if it wasn't hashed so we're safe
1285 sctp_association_free(asoc);
1290 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1293 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1294 * sctp_assoc_t *asoc);
1296 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1297 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1298 * or IPv6 addresses.
1300 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1301 * Section 3.1.2 for this usage.
1303 * addrs is a pointer to an array of one or more socket addresses. Each
1304 * address is contained in its appropriate structure (i.e. struct
1305 * sockaddr_in or struct sockaddr_in6) the family of the address type
1306 * must be used to distengish the address length (note that this
1307 * representation is termed a "packed array" of addresses). The caller
1308 * specifies the number of addresses in the array with addrcnt.
1310 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1311 * the association id of the new association. On failure, sctp_connectx()
1312 * returns -1, and sets errno to the appropriate error code. The assoc_id
1313 * is not touched by the kernel.
1315 * For SCTP, the port given in each socket address must be the same, or
1316 * sctp_connectx() will fail, setting errno to EINVAL.
1318 * An application can use sctp_connectx to initiate an association with
1319 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1320 * allows a caller to specify multiple addresses at which a peer can be
1321 * reached. The way the SCTP stack uses the list of addresses to set up
1322 * the association is implementation dependent. This function only
1323 * specifies that the stack will try to make use of all the addresses in
1324 * the list when needed.
1326 * Note that the list of addresses passed in is only used for setting up
1327 * the association. It does not necessarily equal the set of addresses
1328 * the peer uses for the resulting association. If the caller wants to
1329 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1330 * retrieve them after the association has been set up.
1332 * Basically do nothing but copying the addresses from user to kernel
1333 * land and invoking either sctp_connectx(). This is used for tunneling
1334 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1336 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1339 * sk The sk of the socket
1340 * addrs The pointer to the addresses in user land
1341 * addrssize Size of the addrs buffer
1343 * Returns >=0 if ok, <0 errno code on error.
1345 static int __sctp_setsockopt_connectx(struct sock *sk,
1346 struct sockaddr __user *addrs,
1348 sctp_assoc_t *assoc_id)
1350 struct sockaddr *kaddrs;
1353 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1354 __func__, sk, addrs, addrs_size);
1356 if (unlikely(addrs_size <= 0))
1359 kaddrs = vmemdup_user(addrs, addrs_size);
1360 if (unlikely(IS_ERR(kaddrs)))
1361 return PTR_ERR(kaddrs);
1363 /* Allow security module to validate connectx addresses. */
1364 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1365 (struct sockaddr *)kaddrs,
1370 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1379 * This is an older interface. It's kept for backward compatibility
1380 * to the option that doesn't provide association id.
1382 static int sctp_setsockopt_connectx_old(struct sock *sk,
1383 struct sockaddr __user *addrs,
1386 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1390 * New interface for the API. The since the API is done with a socket
1391 * option, to make it simple we feed back the association id is as a return
1392 * indication to the call. Error is always negative and association id is
1395 static int sctp_setsockopt_connectx(struct sock *sk,
1396 struct sockaddr __user *addrs,
1399 sctp_assoc_t assoc_id = 0;
1402 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1411 * New (hopefully final) interface for the API.
1412 * We use the sctp_getaddrs_old structure so that use-space library
1413 * can avoid any unnecessary allocations. The only different part
1414 * is that we store the actual length of the address buffer into the
1415 * addrs_num structure member. That way we can re-use the existing
1418 #ifdef CONFIG_COMPAT
1419 struct compat_sctp_getaddrs_old {
1420 sctp_assoc_t assoc_id;
1422 compat_uptr_t addrs; /* struct sockaddr * */
1426 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1427 char __user *optval,
1430 struct sctp_getaddrs_old param;
1431 sctp_assoc_t assoc_id = 0;
1434 #ifdef CONFIG_COMPAT
1435 if (in_compat_syscall()) {
1436 struct compat_sctp_getaddrs_old param32;
1438 if (len < sizeof(param32))
1440 if (copy_from_user(¶m32, optval, sizeof(param32)))
1443 param.assoc_id = param32.assoc_id;
1444 param.addr_num = param32.addr_num;
1445 param.addrs = compat_ptr(param32.addrs);
1449 if (len < sizeof(param))
1451 if (copy_from_user(¶m, optval, sizeof(param)))
1455 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1456 param.addrs, param.addr_num,
1458 if (err == 0 || err == -EINPROGRESS) {
1459 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1461 if (put_user(sizeof(assoc_id), optlen))
1468 /* API 3.1.4 close() - UDP Style Syntax
1469 * Applications use close() to perform graceful shutdown (as described in
1470 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1471 * by a UDP-style socket.
1475 * ret = close(int sd);
1477 * sd - the socket descriptor of the associations to be closed.
1479 * To gracefully shutdown a specific association represented by the
1480 * UDP-style socket, an application should use the sendmsg() call,
1481 * passing no user data, but including the appropriate flag in the
1482 * ancillary data (see Section xxxx).
1484 * If sd in the close() call is a branched-off socket representing only
1485 * one association, the shutdown is performed on that association only.
1487 * 4.1.6 close() - TCP Style Syntax
1489 * Applications use close() to gracefully close down an association.
1493 * int close(int sd);
1495 * sd - the socket descriptor of the association to be closed.
1497 * After an application calls close() on a socket descriptor, no further
1498 * socket operations will succeed on that descriptor.
1500 * API 7.1.4 SO_LINGER
1502 * An application using the TCP-style socket can use this option to
1503 * perform the SCTP ABORT primitive. The linger option structure is:
1506 * int l_onoff; // option on/off
1507 * int l_linger; // linger time
1510 * To enable the option, set l_onoff to 1. If the l_linger value is set
1511 * to 0, calling close() is the same as the ABORT primitive. If the
1512 * value is set to a negative value, the setsockopt() call will return
1513 * an error. If the value is set to a positive value linger_time, the
1514 * close() can be blocked for at most linger_time ms. If the graceful
1515 * shutdown phase does not finish during this period, close() will
1516 * return but the graceful shutdown phase continues in the system.
1518 static void sctp_close(struct sock *sk, long timeout)
1520 struct net *net = sock_net(sk);
1521 struct sctp_endpoint *ep;
1522 struct sctp_association *asoc;
1523 struct list_head *pos, *temp;
1524 unsigned int data_was_unread;
1526 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1528 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1529 sk->sk_shutdown = SHUTDOWN_MASK;
1530 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1532 ep = sctp_sk(sk)->ep;
1534 /* Clean up any skbs sitting on the receive queue. */
1535 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1536 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1538 /* Walk all associations on an endpoint. */
1539 list_for_each_safe(pos, temp, &ep->asocs) {
1540 asoc = list_entry(pos, struct sctp_association, asocs);
1542 if (sctp_style(sk, TCP)) {
1543 /* A closed association can still be in the list if
1544 * it belongs to a TCP-style listening socket that is
1545 * not yet accepted. If so, free it. If not, send an
1546 * ABORT or SHUTDOWN based on the linger options.
1548 if (sctp_state(asoc, CLOSED)) {
1549 sctp_association_free(asoc);
1554 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1555 !skb_queue_empty(&asoc->ulpq.reasm) ||
1556 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1557 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1558 struct sctp_chunk *chunk;
1560 chunk = sctp_make_abort_user(asoc, NULL, 0);
1561 sctp_primitive_ABORT(net, asoc, chunk);
1563 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1566 /* On a TCP-style socket, block for at most linger_time if set. */
1567 if (sctp_style(sk, TCP) && timeout)
1568 sctp_wait_for_close(sk, timeout);
1570 /* This will run the backlog queue. */
1573 /* Supposedly, no process has access to the socket, but
1574 * the net layers still may.
1575 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1576 * held and that should be grabbed before socket lock.
1578 spin_lock_bh(&net->sctp.addr_wq_lock);
1579 bh_lock_sock_nested(sk);
1581 /* Hold the sock, since sk_common_release() will put sock_put()
1582 * and we have just a little more cleanup.
1585 sk_common_release(sk);
1588 spin_unlock_bh(&net->sctp.addr_wq_lock);
1592 SCTP_DBG_OBJCNT_DEC(sock);
1595 /* Handle EPIPE error. */
1596 static int sctp_error(struct sock *sk, int flags, int err)
1599 err = sock_error(sk) ? : -EPIPE;
1600 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1601 send_sig(SIGPIPE, current, 0);
1605 /* API 3.1.3 sendmsg() - UDP Style Syntax
1607 * An application uses sendmsg() and recvmsg() calls to transmit data to
1608 * and receive data from its peer.
1610 * ssize_t sendmsg(int socket, const struct msghdr *message,
1613 * socket - the socket descriptor of the endpoint.
1614 * message - pointer to the msghdr structure which contains a single
1615 * user message and possibly some ancillary data.
1617 * See Section 5 for complete description of the data
1620 * flags - flags sent or received with the user message, see Section
1621 * 5 for complete description of the flags.
1623 * Note: This function could use a rewrite especially when explicit
1624 * connect support comes in.
1626 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1628 static int sctp_msghdr_parse(const struct msghdr *msg,
1629 struct sctp_cmsgs *cmsgs);
1631 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1632 struct sctp_sndrcvinfo *srinfo,
1633 const struct msghdr *msg, size_t msg_len)
1638 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1641 if (msg_len > sk->sk_sndbuf)
1644 memset(cmsgs, 0, sizeof(*cmsgs));
1645 err = sctp_msghdr_parse(msg, cmsgs);
1647 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1651 memset(srinfo, 0, sizeof(*srinfo));
1652 if (cmsgs->srinfo) {
1653 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1654 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1655 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1656 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1657 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1658 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1662 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1663 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1664 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1665 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1666 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1669 if (cmsgs->prinfo) {
1670 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1671 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1672 cmsgs->prinfo->pr_policy);
1675 sflags = srinfo->sinfo_flags;
1676 if (!sflags && msg_len)
1679 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1682 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1683 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1686 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1692 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1693 struct sctp_cmsgs *cmsgs,
1694 union sctp_addr *daddr,
1695 struct sctp_transport **tp)
1697 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1698 struct net *net = sock_net(sk);
1699 struct sctp_association *asoc;
1700 enum sctp_scope scope;
1701 struct cmsghdr *cmsg;
1707 if (sflags & (SCTP_EOF | SCTP_ABORT))
1710 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1711 sctp_sstate(sk, CLOSING)))
1712 return -EADDRNOTAVAIL;
1714 if (sctp_endpoint_is_peeled_off(ep, daddr))
1715 return -EADDRNOTAVAIL;
1717 if (!ep->base.bind_addr.port) {
1718 if (sctp_autobind(sk))
1721 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1722 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1726 scope = sctp_scope(daddr);
1728 /* Label connection socket for first association 1-to-many
1729 * style for client sequence socket()->sendmsg(). This
1730 * needs to be done before sctp_assoc_add_peer() as that will
1731 * set up the initial packet that needs to account for any
1732 * security ip options (CIPSO/CALIPSO) added to the packet.
1734 af = sctp_get_af_specific(daddr->sa.sa_family);
1737 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1738 (struct sockaddr *)daddr,
1743 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1747 if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1753 struct sctp_initmsg *init = cmsgs->init;
1755 if (init->sinit_num_ostreams) {
1756 __u16 outcnt = init->sinit_num_ostreams;
1758 asoc->c.sinit_num_ostreams = outcnt;
1759 /* outcnt has been changed, need to re-init stream */
1760 err = sctp_stream_init(&asoc->stream, outcnt, 0,
1766 if (init->sinit_max_instreams)
1767 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1769 if (init->sinit_max_attempts)
1770 asoc->max_init_attempts = init->sinit_max_attempts;
1772 if (init->sinit_max_init_timeo)
1773 asoc->max_init_timeo =
1774 msecs_to_jiffies(init->sinit_max_init_timeo);
1777 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1783 if (!cmsgs->addrs_msg)
1786 /* sendv addr list parse */
1787 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1788 struct sctp_transport *transport;
1789 struct sctp_association *old;
1790 union sctp_addr _daddr;
1793 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1794 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1795 cmsg->cmsg_type != SCTP_DSTADDRV6))
1799 memset(daddr, 0, sizeof(*daddr));
1800 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1801 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1802 if (dlen < sizeof(struct in_addr)) {
1807 dlen = sizeof(struct in_addr);
1808 daddr->v4.sin_family = AF_INET;
1809 daddr->v4.sin_port = htons(asoc->peer.port);
1810 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1812 if (dlen < sizeof(struct in6_addr)) {
1817 dlen = sizeof(struct in6_addr);
1818 daddr->v6.sin6_family = AF_INET6;
1819 daddr->v6.sin6_port = htons(asoc->peer.port);
1820 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1822 err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
1826 old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1827 if (old && old != asoc) {
1828 if (old->state >= SCTP_STATE_ESTABLISHED)
1835 if (sctp_endpoint_is_peeled_off(ep, daddr)) {
1836 err = -EADDRNOTAVAIL;
1840 transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
1851 sctp_association_free(asoc);
1855 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1856 __u16 sflags, struct msghdr *msg,
1859 struct sock *sk = asoc->base.sk;
1860 struct net *net = sock_net(sk);
1862 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1865 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1866 !sctp_state(asoc, ESTABLISHED))
1869 if (sflags & SCTP_EOF) {
1870 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1871 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1876 if (sflags & SCTP_ABORT) {
1877 struct sctp_chunk *chunk;
1879 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1883 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1884 sctp_primitive_ABORT(net, asoc, chunk);
1892 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1893 struct msghdr *msg, size_t msg_len,
1894 struct sctp_transport *transport,
1895 struct sctp_sndrcvinfo *sinfo)
1897 struct sock *sk = asoc->base.sk;
1898 struct net *net = sock_net(sk);
1899 struct sctp_datamsg *datamsg;
1900 bool wait_connect = false;
1901 struct sctp_chunk *chunk;
1905 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1910 if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
1911 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1916 if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
1921 if (asoc->pmtu_pending)
1922 sctp_assoc_pending_pmtu(asoc);
1924 if (sctp_wspace(asoc) < msg_len)
1925 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1927 if (!sctp_wspace(asoc)) {
1928 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1929 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1934 if (sctp_state(asoc, CLOSED)) {
1935 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1939 if (sctp_sk(sk)->strm_interleave) {
1940 timeo = sock_sndtimeo(sk, 0);
1941 err = sctp_wait_for_connect(asoc, &timeo);
1945 wait_connect = true;
1948 pr_debug("%s: we associated primitively\n", __func__);
1951 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1952 if (IS_ERR(datamsg)) {
1953 err = PTR_ERR(datamsg);
1957 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1959 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1960 sctp_chunk_hold(chunk);
1961 sctp_set_owner_w(chunk);
1962 chunk->transport = transport;
1965 err = sctp_primitive_SEND(net, asoc, datamsg);
1967 sctp_datamsg_free(datamsg);
1971 pr_debug("%s: we sent primitively\n", __func__);
1973 sctp_datamsg_put(datamsg);
1975 if (unlikely(wait_connect)) {
1976 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1977 sctp_wait_for_connect(asoc, &timeo);
1986 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1987 const struct msghdr *msg,
1988 struct sctp_cmsgs *cmsgs)
1990 union sctp_addr *daddr = NULL;
1993 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1994 int len = msg->msg_namelen;
1996 if (len > sizeof(*daddr))
1997 len = sizeof(*daddr);
1999 daddr = (union sctp_addr *)msg->msg_name;
2001 err = sctp_verify_addr(sk, daddr, len);
2003 return ERR_PTR(err);
2009 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2010 struct sctp_sndrcvinfo *sinfo,
2011 struct sctp_cmsgs *cmsgs)
2013 if (!cmsgs->srinfo && !cmsgs->sinfo) {
2014 sinfo->sinfo_stream = asoc->default_stream;
2015 sinfo->sinfo_ppid = asoc->default_ppid;
2016 sinfo->sinfo_context = asoc->default_context;
2017 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2020 sinfo->sinfo_flags = asoc->default_flags;
2023 if (!cmsgs->srinfo && !cmsgs->prinfo)
2024 sinfo->sinfo_timetolive = asoc->default_timetolive;
2026 if (cmsgs->authinfo) {
2027 /* Reuse sinfo_tsn to indicate that authinfo was set and
2028 * sinfo_ssn to save the keyid on tx path.
2030 sinfo->sinfo_tsn = 1;
2031 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2035 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2037 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2038 struct sctp_transport *transport = NULL;
2039 struct sctp_sndrcvinfo _sinfo, *sinfo;
2040 struct sctp_association *asoc;
2041 struct sctp_cmsgs cmsgs;
2042 union sctp_addr *daddr;
2047 /* Parse and get snd_info */
2048 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2053 sflags = sinfo->sinfo_flags;
2055 /* Get daddr from msg */
2056 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2057 if (IS_ERR(daddr)) {
2058 err = PTR_ERR(daddr);
2064 /* SCTP_SENDALL process */
2065 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2066 list_for_each_entry(asoc, &ep->asocs, asocs) {
2067 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2074 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2076 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2081 iov_iter_revert(&msg->msg_iter, err);
2087 /* Get and check or create asoc */
2089 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2091 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2096 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2101 asoc = transport->asoc;
2105 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2108 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2114 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2119 /* Update snd_info with the asoc */
2120 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2122 /* Send msg to the asoc */
2123 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2124 if (err < 0 && err != -ESRCH && new)
2125 sctp_association_free(asoc);
2130 return sctp_error(sk, msg->msg_flags, err);
2133 /* This is an extended version of skb_pull() that removes the data from the
2134 * start of a skb even when data is spread across the list of skb's in the
2135 * frag_list. len specifies the total amount of data that needs to be removed.
2136 * when 'len' bytes could be removed from the skb, it returns 0.
2137 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2138 * could not be removed.
2140 static int sctp_skb_pull(struct sk_buff *skb, int len)
2142 struct sk_buff *list;
2143 int skb_len = skb_headlen(skb);
2146 if (len <= skb_len) {
2147 __skb_pull(skb, len);
2151 __skb_pull(skb, skb_len);
2153 skb_walk_frags(skb, list) {
2154 rlen = sctp_skb_pull(list, len);
2155 skb->len -= (len-rlen);
2156 skb->data_len -= (len-rlen);
2167 /* API 3.1.3 recvmsg() - UDP Style Syntax
2169 * ssize_t recvmsg(int socket, struct msghdr *message,
2172 * socket - the socket descriptor of the endpoint.
2173 * message - pointer to the msghdr structure which contains a single
2174 * user message and possibly some ancillary data.
2176 * See Section 5 for complete description of the data
2179 * flags - flags sent or received with the user message, see Section
2180 * 5 for complete description of the flags.
2182 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2183 int noblock, int flags, int *addr_len)
2185 struct sctp_ulpevent *event = NULL;
2186 struct sctp_sock *sp = sctp_sk(sk);
2187 struct sk_buff *skb, *head_skb;
2192 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2193 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2198 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2199 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2204 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2208 /* Get the total length of the skb including any skb's in the
2217 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2219 event = sctp_skb2event(skb);
2224 if (event->chunk && event->chunk->head_skb)
2225 head_skb = event->chunk->head_skb;
2228 sock_recv_ts_and_drops(msg, sk, head_skb);
2229 if (sctp_ulpevent_is_notification(event)) {
2230 msg->msg_flags |= MSG_NOTIFICATION;
2231 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2233 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2236 /* Check if we allow SCTP_NXTINFO. */
2237 if (sp->recvnxtinfo)
2238 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2239 /* Check if we allow SCTP_RCVINFO. */
2240 if (sp->recvrcvinfo)
2241 sctp_ulpevent_read_rcvinfo(event, msg);
2242 /* Check if we allow SCTP_SNDRCVINFO. */
2243 if (sp->subscribe.sctp_data_io_event)
2244 sctp_ulpevent_read_sndrcvinfo(event, msg);
2248 /* If skb's length exceeds the user's buffer, update the skb and
2249 * push it back to the receive_queue so that the next call to
2250 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2252 if (skb_len > copied) {
2253 msg->msg_flags &= ~MSG_EOR;
2254 if (flags & MSG_PEEK)
2256 sctp_skb_pull(skb, copied);
2257 skb_queue_head(&sk->sk_receive_queue, skb);
2259 /* When only partial message is copied to the user, increase
2260 * rwnd by that amount. If all the data in the skb is read,
2261 * rwnd is updated when the event is freed.
2263 if (!sctp_ulpevent_is_notification(event))
2264 sctp_assoc_rwnd_increase(event->asoc, copied);
2266 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2267 (event->msg_flags & MSG_EOR))
2268 msg->msg_flags |= MSG_EOR;
2270 msg->msg_flags &= ~MSG_EOR;
2273 if (flags & MSG_PEEK) {
2274 /* Release the skb reference acquired after peeking the skb in
2275 * sctp_skb_recv_datagram().
2279 /* Free the event which includes releasing the reference to
2280 * the owner of the skb, freeing the skb and updating the
2283 sctp_ulpevent_free(event);
2290 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2292 * This option is a on/off flag. If enabled no SCTP message
2293 * fragmentation will be performed. Instead if a message being sent
2294 * exceeds the current PMTU size, the message will NOT be sent and
2295 * instead a error will be indicated to the user.
2297 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2298 char __user *optval,
2299 unsigned int optlen)
2303 if (optlen < sizeof(int))
2306 if (get_user(val, (int __user *)optval))
2309 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2314 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2315 unsigned int optlen)
2317 struct sctp_association *asoc;
2318 struct sctp_ulpevent *event;
2320 if (optlen > sizeof(struct sctp_event_subscribe))
2322 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2325 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2326 * if there is no data to be sent or retransmit, the stack will
2327 * immediately send up this notification.
2329 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2330 &sctp_sk(sk)->subscribe)) {
2331 asoc = sctp_id2assoc(sk, 0);
2333 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2334 event = sctp_ulpevent_make_sender_dry_event(asoc,
2335 GFP_USER | __GFP_NOWARN);
2339 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2346 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2348 * This socket option is applicable to the UDP-style socket only. When
2349 * set it will cause associations that are idle for more than the
2350 * specified number of seconds to automatically close. An association
2351 * being idle is defined an association that has NOT sent or received
2352 * user data. The special value of '0' indicates that no automatic
2353 * close of any associations should be performed. The option expects an
2354 * integer defining the number of seconds of idle time before an
2355 * association is closed.
2357 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2358 unsigned int optlen)
2360 struct sctp_sock *sp = sctp_sk(sk);
2361 struct net *net = sock_net(sk);
2363 /* Applicable to UDP-style socket only */
2364 if (sctp_style(sk, TCP))
2366 if (optlen != sizeof(int))
2368 if (copy_from_user(&sp->autoclose, optval, optlen))
2371 if (sp->autoclose > net->sctp.max_autoclose)
2372 sp->autoclose = net->sctp.max_autoclose;
2377 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2379 * Applications can enable or disable heartbeats for any peer address of
2380 * an association, modify an address's heartbeat interval, force a
2381 * heartbeat to be sent immediately, and adjust the address's maximum
2382 * number of retransmissions sent before an address is considered
2383 * unreachable. The following structure is used to access and modify an
2384 * address's parameters:
2386 * struct sctp_paddrparams {
2387 * sctp_assoc_t spp_assoc_id;
2388 * struct sockaddr_storage spp_address;
2389 * uint32_t spp_hbinterval;
2390 * uint16_t spp_pathmaxrxt;
2391 * uint32_t spp_pathmtu;
2392 * uint32_t spp_sackdelay;
2393 * uint32_t spp_flags;
2396 * spp_assoc_id - (one-to-many style socket) This is filled in the
2397 * application, and identifies the association for
2399 * spp_address - This specifies which address is of interest.
2400 * spp_hbinterval - This contains the value of the heartbeat interval,
2401 * in milliseconds. If a value of zero
2402 * is present in this field then no changes are to
2403 * be made to this parameter.
2404 * spp_pathmaxrxt - This contains the maximum number of
2405 * retransmissions before this address shall be
2406 * considered unreachable. If a value of zero
2407 * is present in this field then no changes are to
2408 * be made to this parameter.
2409 * spp_pathmtu - When Path MTU discovery is disabled the value
2410 * specified here will be the "fixed" path mtu.
2411 * Note that if the spp_address field is empty
2412 * then all associations on this address will
2413 * have this fixed path mtu set upon them.
2415 * spp_sackdelay - When delayed sack is enabled, this value specifies
2416 * the number of milliseconds that sacks will be delayed
2417 * for. This value will apply to all addresses of an
2418 * association if the spp_address field is empty. Note
2419 * also, that if delayed sack is enabled and this
2420 * value is set to 0, no change is made to the last
2421 * recorded delayed sack timer value.
2423 * spp_flags - These flags are used to control various features
2424 * on an association. The flag field may contain
2425 * zero or more of the following options.
2427 * SPP_HB_ENABLE - Enable heartbeats on the
2428 * specified address. Note that if the address
2429 * field is empty all addresses for the association
2430 * have heartbeats enabled upon them.
2432 * SPP_HB_DISABLE - Disable heartbeats on the
2433 * speicifed address. Note that if the address
2434 * field is empty all addresses for the association
2435 * will have their heartbeats disabled. Note also
2436 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2437 * mutually exclusive, only one of these two should
2438 * be specified. Enabling both fields will have
2439 * undetermined results.
2441 * SPP_HB_DEMAND - Request a user initiated heartbeat
2442 * to be made immediately.
2444 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2445 * heartbeat delayis to be set to the value of 0
2448 * SPP_PMTUD_ENABLE - This field will enable PMTU
2449 * discovery upon the specified address. Note that
2450 * if the address feild is empty then all addresses
2451 * on the association are effected.
2453 * SPP_PMTUD_DISABLE - This field will disable PMTU
2454 * discovery upon the specified address. Note that
2455 * if the address feild is empty then all addresses
2456 * on the association are effected. Not also that
2457 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2458 * exclusive. Enabling both will have undetermined
2461 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2462 * on delayed sack. The time specified in spp_sackdelay
2463 * is used to specify the sack delay for this address. Note
2464 * that if spp_address is empty then all addresses will
2465 * enable delayed sack and take on the sack delay
2466 * value specified in spp_sackdelay.
2467 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2468 * off delayed sack. If the spp_address field is blank then
2469 * delayed sack is disabled for the entire association. Note
2470 * also that this field is mutually exclusive to
2471 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2474 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2475 struct sctp_transport *trans,
2476 struct sctp_association *asoc,
2477 struct sctp_sock *sp,
2480 int sackdelay_change)
2484 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2485 struct net *net = sock_net(trans->asoc->base.sk);
2487 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2492 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2493 * this field is ignored. Note also that a value of zero indicates
2494 * the current setting should be left unchanged.
2496 if (params->spp_flags & SPP_HB_ENABLE) {
2498 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2499 * set. This lets us use 0 value when this flag
2502 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2503 params->spp_hbinterval = 0;
2505 if (params->spp_hbinterval ||
2506 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2509 msecs_to_jiffies(params->spp_hbinterval);
2512 msecs_to_jiffies(params->spp_hbinterval);
2514 sp->hbinterval = params->spp_hbinterval;
2521 trans->param_flags =
2522 (trans->param_flags & ~SPP_HB) | hb_change;
2525 (asoc->param_flags & ~SPP_HB) | hb_change;
2528 (sp->param_flags & ~SPP_HB) | hb_change;
2532 /* When Path MTU discovery is disabled the value specified here will
2533 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2534 * include the flag SPP_PMTUD_DISABLE for this field to have any
2537 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2539 trans->pathmtu = params->spp_pathmtu;
2540 sctp_assoc_sync_pmtu(asoc);
2542 asoc->pathmtu = params->spp_pathmtu;
2544 sp->pathmtu = params->spp_pathmtu;
2550 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2551 (params->spp_flags & SPP_PMTUD_ENABLE);
2552 trans->param_flags =
2553 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2555 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2556 sctp_assoc_sync_pmtu(asoc);
2560 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2563 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2567 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2568 * value of this field is ignored. Note also that a value of zero
2569 * indicates the current setting should be left unchanged.
2571 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2574 msecs_to_jiffies(params->spp_sackdelay);
2577 msecs_to_jiffies(params->spp_sackdelay);
2579 sp->sackdelay = params->spp_sackdelay;
2583 if (sackdelay_change) {
2585 trans->param_flags =
2586 (trans->param_flags & ~SPP_SACKDELAY) |
2590 (asoc->param_flags & ~SPP_SACKDELAY) |
2594 (sp->param_flags & ~SPP_SACKDELAY) |
2599 /* Note that a value of zero indicates the current setting should be
2602 if (params->spp_pathmaxrxt) {
2604 trans->pathmaxrxt = params->spp_pathmaxrxt;
2606 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2608 sp->pathmaxrxt = params->spp_pathmaxrxt;
2615 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2616 char __user *optval,
2617 unsigned int optlen)
2619 struct sctp_paddrparams params;
2620 struct sctp_transport *trans = NULL;
2621 struct sctp_association *asoc = NULL;
2622 struct sctp_sock *sp = sctp_sk(sk);
2624 int hb_change, pmtud_change, sackdelay_change;
2626 if (optlen != sizeof(struct sctp_paddrparams))
2629 if (copy_from_user(¶ms, optval, optlen))
2632 /* Validate flags and value parameters. */
2633 hb_change = params.spp_flags & SPP_HB;
2634 pmtud_change = params.spp_flags & SPP_PMTUD;
2635 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2637 if (hb_change == SPP_HB ||
2638 pmtud_change == SPP_PMTUD ||
2639 sackdelay_change == SPP_SACKDELAY ||
2640 params.spp_sackdelay > 500 ||
2641 (params.spp_pathmtu &&
2642 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2645 /* If an address other than INADDR_ANY is specified, and
2646 * no transport is found, then the request is invalid.
2648 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2649 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2650 params.spp_assoc_id);
2655 /* Get association, if assoc_id != 0 and the socket is a one
2656 * to many style socket, and an association was not found, then
2657 * the id was invalid.
2659 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2660 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2663 /* Heartbeat demand can only be sent on a transport or
2664 * association, but not a socket.
2666 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2669 /* Process parameters. */
2670 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2671 hb_change, pmtud_change,
2677 /* If changes are for association, also apply parameters to each
2680 if (!trans && asoc) {
2681 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2683 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2684 hb_change, pmtud_change,
2692 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2694 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2697 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2699 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2703 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2705 * This option will effect the way delayed acks are performed. This
2706 * option allows you to get or set the delayed ack time, in
2707 * milliseconds. It also allows changing the delayed ack frequency.
2708 * Changing the frequency to 1 disables the delayed sack algorithm. If
2709 * the assoc_id is 0, then this sets or gets the endpoints default
2710 * values. If the assoc_id field is non-zero, then the set or get
2711 * effects the specified association for the one to many model (the
2712 * assoc_id field is ignored by the one to one model). Note that if
2713 * sack_delay or sack_freq are 0 when setting this option, then the
2714 * current values will remain unchanged.
2716 * struct sctp_sack_info {
2717 * sctp_assoc_t sack_assoc_id;
2718 * uint32_t sack_delay;
2719 * uint32_t sack_freq;
2722 * sack_assoc_id - This parameter, indicates which association the user
2723 * is performing an action upon. Note that if this field's value is
2724 * zero then the endpoints default value is changed (effecting future
2725 * associations only).
2727 * sack_delay - This parameter contains the number of milliseconds that
2728 * the user is requesting the delayed ACK timer be set to. Note that
2729 * this value is defined in the standard to be between 200 and 500
2732 * sack_freq - This parameter contains the number of packets that must
2733 * be received before a sack is sent without waiting for the delay
2734 * timer to expire. The default value for this is 2, setting this
2735 * value to 1 will disable the delayed sack algorithm.
2738 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2739 char __user *optval, unsigned int optlen)
2741 struct sctp_sack_info params;
2742 struct sctp_transport *trans = NULL;
2743 struct sctp_association *asoc = NULL;
2744 struct sctp_sock *sp = sctp_sk(sk);
2746 if (optlen == sizeof(struct sctp_sack_info)) {
2747 if (copy_from_user(¶ms, optval, optlen))
2750 if (params.sack_delay == 0 && params.sack_freq == 0)
2752 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2753 pr_warn_ratelimited(DEPRECATED
2755 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2756 "Use struct sctp_sack_info instead\n",
2757 current->comm, task_pid_nr(current));
2758 if (copy_from_user(¶ms, optval, optlen))
2761 if (params.sack_delay == 0)
2762 params.sack_freq = 1;
2764 params.sack_freq = 0;
2768 /* Validate value parameter. */
2769 if (params.sack_delay > 500)
2772 /* Get association, if sack_assoc_id != 0 and the socket is a one
2773 * to many style socket, and an association was not found, then
2774 * the id was invalid.
2776 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2777 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2780 if (params.sack_delay) {
2783 msecs_to_jiffies(params.sack_delay);
2785 sctp_spp_sackdelay_enable(asoc->param_flags);
2787 sp->sackdelay = params.sack_delay;
2789 sctp_spp_sackdelay_enable(sp->param_flags);
2793 if (params.sack_freq == 1) {
2796 sctp_spp_sackdelay_disable(asoc->param_flags);
2799 sctp_spp_sackdelay_disable(sp->param_flags);
2801 } else if (params.sack_freq > 1) {
2803 asoc->sackfreq = params.sack_freq;
2805 sctp_spp_sackdelay_enable(asoc->param_flags);
2807 sp->sackfreq = params.sack_freq;
2809 sctp_spp_sackdelay_enable(sp->param_flags);
2813 /* If change is for association, also apply to each transport. */
2815 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2817 if (params.sack_delay) {
2819 msecs_to_jiffies(params.sack_delay);
2820 trans->param_flags =
2821 sctp_spp_sackdelay_enable(trans->param_flags);
2823 if (params.sack_freq == 1) {
2824 trans->param_flags =
2825 sctp_spp_sackdelay_disable(trans->param_flags);
2826 } else if (params.sack_freq > 1) {
2827 trans->sackfreq = params.sack_freq;
2828 trans->param_flags =
2829 sctp_spp_sackdelay_enable(trans->param_flags);
2837 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2839 * Applications can specify protocol parameters for the default association
2840 * initialization. The option name argument to setsockopt() and getsockopt()
2843 * Setting initialization parameters is effective only on an unconnected
2844 * socket (for UDP-style sockets only future associations are effected
2845 * by the change). With TCP-style sockets, this option is inherited by
2846 * sockets derived from a listener socket.
2848 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2850 struct sctp_initmsg sinit;
2851 struct sctp_sock *sp = sctp_sk(sk);
2853 if (optlen != sizeof(struct sctp_initmsg))
2855 if (copy_from_user(&sinit, optval, optlen))
2858 if (sinit.sinit_num_ostreams)
2859 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2860 if (sinit.sinit_max_instreams)
2861 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2862 if (sinit.sinit_max_attempts)
2863 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2864 if (sinit.sinit_max_init_timeo)
2865 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2871 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2873 * Applications that wish to use the sendto() system call may wish to
2874 * specify a default set of parameters that would normally be supplied
2875 * through the inclusion of ancillary data. This socket option allows
2876 * such an application to set the default sctp_sndrcvinfo structure.
2877 * The application that wishes to use this socket option simply passes
2878 * in to this call the sctp_sndrcvinfo structure defined in Section
2879 * 5.2.2) The input parameters accepted by this call include
2880 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2881 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2882 * to this call if the caller is using the UDP model.
2884 static int sctp_setsockopt_default_send_param(struct sock *sk,
2885 char __user *optval,
2886 unsigned int optlen)
2888 struct sctp_sock *sp = sctp_sk(sk);
2889 struct sctp_association *asoc;
2890 struct sctp_sndrcvinfo info;
2892 if (optlen != sizeof(info))
2894 if (copy_from_user(&info, optval, optlen))
2896 if (info.sinfo_flags &
2897 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2898 SCTP_ABORT | SCTP_EOF))
2901 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2902 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2905 asoc->default_stream = info.sinfo_stream;
2906 asoc->default_flags = info.sinfo_flags;
2907 asoc->default_ppid = info.sinfo_ppid;
2908 asoc->default_context = info.sinfo_context;
2909 asoc->default_timetolive = info.sinfo_timetolive;
2911 sp->default_stream = info.sinfo_stream;
2912 sp->default_flags = info.sinfo_flags;
2913 sp->default_ppid = info.sinfo_ppid;
2914 sp->default_context = info.sinfo_context;
2915 sp->default_timetolive = info.sinfo_timetolive;
2921 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2922 * (SCTP_DEFAULT_SNDINFO)
2924 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2925 char __user *optval,
2926 unsigned int optlen)
2928 struct sctp_sock *sp = sctp_sk(sk);
2929 struct sctp_association *asoc;
2930 struct sctp_sndinfo info;
2932 if (optlen != sizeof(info))
2934 if (copy_from_user(&info, optval, optlen))
2936 if (info.snd_flags &
2937 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2938 SCTP_ABORT | SCTP_EOF))
2941 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2942 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2945 asoc->default_stream = info.snd_sid;
2946 asoc->default_flags = info.snd_flags;
2947 asoc->default_ppid = info.snd_ppid;
2948 asoc->default_context = info.snd_context;
2950 sp->default_stream = info.snd_sid;
2951 sp->default_flags = info.snd_flags;
2952 sp->default_ppid = info.snd_ppid;
2953 sp->default_context = info.snd_context;
2959 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2961 * Requests that the local SCTP stack use the enclosed peer address as
2962 * the association primary. The enclosed address must be one of the
2963 * association peer's addresses.
2965 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2966 unsigned int optlen)
2968 struct sctp_prim prim;
2969 struct sctp_transport *trans;
2973 if (optlen != sizeof(struct sctp_prim))
2976 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2979 /* Allow security module to validate address but need address len. */
2980 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
2984 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
2985 (struct sockaddr *)&prim.ssp_addr,
2990 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2994 sctp_assoc_set_primary(trans->asoc, trans);
3000 * 7.1.5 SCTP_NODELAY
3002 * Turn on/off any Nagle-like algorithm. This means that packets are
3003 * generally sent as soon as possible and no unnecessary delays are
3004 * introduced, at the cost of more packets in the network. Expects an
3005 * integer boolean flag.
3007 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3008 unsigned int optlen)
3012 if (optlen < sizeof(int))
3014 if (get_user(val, (int __user *)optval))
3017 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3023 * 7.1.1 SCTP_RTOINFO
3025 * The protocol parameters used to initialize and bound retransmission
3026 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3027 * and modify these parameters.
3028 * All parameters are time values, in milliseconds. A value of 0, when
3029 * modifying the parameters, indicates that the current value should not
3033 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3035 struct sctp_rtoinfo rtoinfo;
3036 struct sctp_association *asoc;
3037 unsigned long rto_min, rto_max;
3038 struct sctp_sock *sp = sctp_sk(sk);
3040 if (optlen != sizeof (struct sctp_rtoinfo))
3043 if (copy_from_user(&rtoinfo, optval, optlen))
3046 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3048 /* Set the values to the specific association */
3049 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
3052 rto_max = rtoinfo.srto_max;
3053 rto_min = rtoinfo.srto_min;
3056 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3058 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3061 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3063 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3065 if (rto_min > rto_max)
3069 if (rtoinfo.srto_initial != 0)
3071 msecs_to_jiffies(rtoinfo.srto_initial);
3072 asoc->rto_max = rto_max;
3073 asoc->rto_min = rto_min;
3075 /* If there is no association or the association-id = 0
3076 * set the values to the endpoint.
3078 if (rtoinfo.srto_initial != 0)
3079 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3080 sp->rtoinfo.srto_max = rto_max;
3081 sp->rtoinfo.srto_min = rto_min;
3089 * 7.1.2 SCTP_ASSOCINFO
3091 * This option is used to tune the maximum retransmission attempts
3092 * of the association.
3093 * Returns an error if the new association retransmission value is
3094 * greater than the sum of the retransmission value of the peer.
3095 * See [SCTP] for more information.
3098 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3101 struct sctp_assocparams assocparams;
3102 struct sctp_association *asoc;
3104 if (optlen != sizeof(struct sctp_assocparams))
3106 if (copy_from_user(&assocparams, optval, optlen))
3109 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3111 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3114 /* Set the values to the specific association */
3116 if (assocparams.sasoc_asocmaxrxt != 0) {
3119 struct sctp_transport *peer_addr;
3121 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3123 path_sum += peer_addr->pathmaxrxt;
3127 /* Only validate asocmaxrxt if we have more than
3128 * one path/transport. We do this because path
3129 * retransmissions are only counted when we have more
3133 assocparams.sasoc_asocmaxrxt > path_sum)
3136 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3139 if (assocparams.sasoc_cookie_life != 0)
3140 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3142 /* Set the values to the endpoint */
3143 struct sctp_sock *sp = sctp_sk(sk);
3145 if (assocparams.sasoc_asocmaxrxt != 0)
3146 sp->assocparams.sasoc_asocmaxrxt =
3147 assocparams.sasoc_asocmaxrxt;
3148 if (assocparams.sasoc_cookie_life != 0)
3149 sp->assocparams.sasoc_cookie_life =
3150 assocparams.sasoc_cookie_life;
3156 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3158 * This socket option is a boolean flag which turns on or off mapped V4
3159 * addresses. If this option is turned on and the socket is type
3160 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3161 * If this option is turned off, then no mapping will be done of V4
3162 * addresses and a user will receive both PF_INET6 and PF_INET type
3163 * addresses on the socket.
3165 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3168 struct sctp_sock *sp = sctp_sk(sk);
3170 if (optlen < sizeof(int))
3172 if (get_user(val, (int __user *)optval))
3183 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3184 * This option will get or set the maximum size to put in any outgoing
3185 * SCTP DATA chunk. If a message is larger than this size it will be
3186 * fragmented by SCTP into the specified size. Note that the underlying
3187 * SCTP implementation may fragment into smaller sized chunks when the
3188 * PMTU of the underlying association is smaller than the value set by
3189 * the user. The default value for this option is '0' which indicates
3190 * the user is NOT limiting fragmentation and only the PMTU will effect
3191 * SCTP's choice of DATA chunk size. Note also that values set larger
3192 * than the maximum size of an IP datagram will effectively let SCTP
3193 * control fragmentation (i.e. the same as setting this option to 0).
3195 * The following structure is used to access and modify this parameter:
3197 * struct sctp_assoc_value {
3198 * sctp_assoc_t assoc_id;
3199 * uint32_t assoc_value;
3202 * assoc_id: This parameter is ignored for one-to-one style sockets.
3203 * For one-to-many style sockets this parameter indicates which
3204 * association the user is performing an action upon. Note that if
3205 * this field's value is zero then the endpoints default value is
3206 * changed (effecting future associations only).
3207 * assoc_value: This parameter specifies the maximum size in bytes.
3209 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3211 struct sctp_sock *sp = sctp_sk(sk);
3212 struct sctp_af *af = sp->pf->af;
3213 struct sctp_assoc_value params;
3214 struct sctp_association *asoc;
3217 if (optlen == sizeof(int)) {
3218 pr_warn_ratelimited(DEPRECATED
3220 "Use of int in maxseg socket option.\n"
3221 "Use struct sctp_assoc_value instead\n",
3222 current->comm, task_pid_nr(current));
3223 if (copy_from_user(&val, optval, optlen))
3225 params.assoc_id = 0;
3226 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3227 if (copy_from_user(¶ms, optval, optlen))
3229 val = params.assoc_value;
3235 int min_len, max_len;
3237 min_len = SCTP_DEFAULT_MINSEGMENT - af->net_header_len;
3238 min_len -= af->ip_options_len(sk);
3239 min_len -= sizeof(struct sctphdr) +
3240 sizeof(struct sctp_data_chunk);
3242 max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
3244 if (val < min_len || val > max_len)
3248 asoc = sctp_id2assoc(sk, params.assoc_id);
3251 val = asoc->pathmtu - af->net_header_len;
3252 val -= af->ip_options_len(sk);
3253 val -= sizeof(struct sctphdr) +
3254 sctp_datachk_len(&asoc->stream);
3256 asoc->user_frag = val;
3257 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3259 if (params.assoc_id && sctp_style(sk, UDP))
3261 sp->user_frag = val;
3269 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3271 * Requests that the peer mark the enclosed address as the association
3272 * primary. The enclosed address must be one of the association's
3273 * locally bound addresses. The following structure is used to make a
3274 * set primary request:
3276 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3277 unsigned int optlen)
3279 struct net *net = sock_net(sk);
3280 struct sctp_sock *sp;
3281 struct sctp_association *asoc = NULL;
3282 struct sctp_setpeerprim prim;
3283 struct sctp_chunk *chunk;
3289 if (!net->sctp.addip_enable)
3292 if (optlen != sizeof(struct sctp_setpeerprim))
3295 if (copy_from_user(&prim, optval, optlen))
3298 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3302 if (!asoc->peer.asconf_capable)
3305 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3308 if (!sctp_state(asoc, ESTABLISHED))
3311 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3315 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3316 return -EADDRNOTAVAIL;
3318 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3319 return -EADDRNOTAVAIL;
3321 /* Allow security module to validate address. */
3322 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3323 (struct sockaddr *)&prim.sspp_addr,
3328 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3329 chunk = sctp_make_asconf_set_prim(asoc,
3330 (union sctp_addr *)&prim.sspp_addr);
3334 err = sctp_send_asconf(asoc, chunk);
3336 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3341 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3342 unsigned int optlen)
3344 struct sctp_setadaptation adaptation;
3346 if (optlen != sizeof(struct sctp_setadaptation))
3348 if (copy_from_user(&adaptation, optval, optlen))
3351 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3357 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3359 * The context field in the sctp_sndrcvinfo structure is normally only
3360 * used when a failed message is retrieved holding the value that was
3361 * sent down on the actual send call. This option allows the setting of
3362 * a default context on an association basis that will be received on
3363 * reading messages from the peer. This is especially helpful in the
3364 * one-2-many model for an application to keep some reference to an
3365 * internal state machine that is processing messages on the
3366 * association. Note that the setting of this value only effects
3367 * received messages from the peer and does not effect the value that is
3368 * saved with outbound messages.
3370 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3371 unsigned int optlen)
3373 struct sctp_assoc_value params;
3374 struct sctp_sock *sp;
3375 struct sctp_association *asoc;
3377 if (optlen != sizeof(struct sctp_assoc_value))
3379 if (copy_from_user(¶ms, optval, optlen))
3384 if (params.assoc_id != 0) {
3385 asoc = sctp_id2assoc(sk, params.assoc_id);
3388 asoc->default_rcv_context = params.assoc_value;
3390 sp->default_rcv_context = params.assoc_value;
3397 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3399 * This options will at a minimum specify if the implementation is doing
3400 * fragmented interleave. Fragmented interleave, for a one to many
3401 * socket, is when subsequent calls to receive a message may return
3402 * parts of messages from different associations. Some implementations
3403 * may allow you to turn this value on or off. If so, when turned off,
3404 * no fragment interleave will occur (which will cause a head of line
3405 * blocking amongst multiple associations sharing the same one to many
3406 * socket). When this option is turned on, then each receive call may
3407 * come from a different association (thus the user must receive data
3408 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3409 * association each receive belongs to.
3411 * This option takes a boolean value. A non-zero value indicates that
3412 * fragmented interleave is on. A value of zero indicates that
3413 * fragmented interleave is off.
3415 * Note that it is important that an implementation that allows this
3416 * option to be turned on, have it off by default. Otherwise an unaware
3417 * application using the one to many model may become confused and act
3420 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3421 char __user *optval,
3422 unsigned int optlen)
3426 if (optlen != sizeof(int))
3428 if (get_user(val, (int __user *)optval))
3431 sctp_sk(sk)->frag_interleave = !!val;
3433 if (!sctp_sk(sk)->frag_interleave)
3434 sctp_sk(sk)->strm_interleave = 0;
3440 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3441 * (SCTP_PARTIAL_DELIVERY_POINT)
3443 * This option will set or get the SCTP partial delivery point. This
3444 * point is the size of a message where the partial delivery API will be
3445 * invoked to help free up rwnd space for the peer. Setting this to a
3446 * lower value will cause partial deliveries to happen more often. The
3447 * calls argument is an integer that sets or gets the partial delivery
3448 * point. Note also that the call will fail if the user attempts to set
3449 * this value larger than the socket receive buffer size.
3451 * Note that any single message having a length smaller than or equal to
3452 * the SCTP partial delivery point will be delivered in one single read
3453 * call as long as the user provided buffer is large enough to hold the
3456 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3457 char __user *optval,
3458 unsigned int optlen)
3462 if (optlen != sizeof(u32))
3464 if (get_user(val, (int __user *)optval))
3467 /* Note: We double the receive buffer from what the user sets
3468 * it to be, also initial rwnd is based on rcvbuf/2.
3470 if (val > (sk->sk_rcvbuf >> 1))
3473 sctp_sk(sk)->pd_point = val;
3475 return 0; /* is this the right error code? */
3479 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3481 * This option will allow a user to change the maximum burst of packets
3482 * that can be emitted by this association. Note that the default value
3483 * is 4, and some implementations may restrict this setting so that it
3484 * can only be lowered.
3486 * NOTE: This text doesn't seem right. Do this on a socket basis with
3487 * future associations inheriting the socket value.
3489 static int sctp_setsockopt_maxburst(struct sock *sk,
3490 char __user *optval,
3491 unsigned int optlen)
3493 struct sctp_assoc_value params;
3494 struct sctp_sock *sp;
3495 struct sctp_association *asoc;
3499 if (optlen == sizeof(int)) {
3500 pr_warn_ratelimited(DEPRECATED
3502 "Use of int in max_burst socket option deprecated.\n"
3503 "Use struct sctp_assoc_value instead\n",
3504 current->comm, task_pid_nr(current));
3505 if (copy_from_user(&val, optval, optlen))
3507 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3508 if (copy_from_user(¶ms, optval, optlen))
3510 val = params.assoc_value;
3511 assoc_id = params.assoc_id;
3517 if (assoc_id != 0) {
3518 asoc = sctp_id2assoc(sk, assoc_id);
3521 asoc->max_burst = val;
3523 sp->max_burst = val;
3529 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3531 * This set option adds a chunk type that the user is requesting to be
3532 * received only in an authenticated way. Changes to the list of chunks
3533 * will only effect future associations on the socket.
3535 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3536 char __user *optval,
3537 unsigned int optlen)
3539 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3540 struct sctp_authchunk val;
3542 if (!ep->auth_enable)
3545 if (optlen != sizeof(struct sctp_authchunk))
3547 if (copy_from_user(&val, optval, optlen))
3550 switch (val.sauth_chunk) {
3552 case SCTP_CID_INIT_ACK:
3553 case SCTP_CID_SHUTDOWN_COMPLETE:
3558 /* add this chunk id to the endpoint */
3559 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3563 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3565 * This option gets or sets the list of HMAC algorithms that the local
3566 * endpoint requires the peer to use.
3568 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3569 char __user *optval,
3570 unsigned int optlen)
3572 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3573 struct sctp_hmacalgo *hmacs;
3577 if (!ep->auth_enable)
3580 if (optlen < sizeof(struct sctp_hmacalgo))
3582 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3583 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3585 hmacs = memdup_user(optval, optlen);
3587 return PTR_ERR(hmacs);
3589 idents = hmacs->shmac_num_idents;
3590 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3591 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3596 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3603 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3605 * This option will set a shared secret key which is used to build an
3606 * association shared key.
3608 static int sctp_setsockopt_auth_key(struct sock *sk,
3609 char __user *optval,
3610 unsigned int optlen)
3612 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3613 struct sctp_authkey *authkey;
3614 struct sctp_association *asoc;
3617 if (!ep->auth_enable)
3620 if (optlen <= sizeof(struct sctp_authkey))
3622 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3625 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3626 sizeof(struct sctp_authkey));
3628 authkey = memdup_user(optval, optlen);
3629 if (IS_ERR(authkey))
3630 return PTR_ERR(authkey);
3632 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3637 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3638 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3643 ret = sctp_auth_set_key(ep, asoc, authkey);
3650 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3652 * This option will get or set the active shared key to be used to build
3653 * the association shared key.
3655 static int sctp_setsockopt_active_key(struct sock *sk,
3656 char __user *optval,
3657 unsigned int optlen)
3659 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3660 struct sctp_authkeyid val;
3661 struct sctp_association *asoc;
3663 if (!ep->auth_enable)
3666 if (optlen != sizeof(struct sctp_authkeyid))
3668 if (copy_from_user(&val, optval, optlen))
3671 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3672 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3675 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3679 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3681 * This set option will delete a shared secret key from use.
3683 static int sctp_setsockopt_del_key(struct sock *sk,
3684 char __user *optval,
3685 unsigned int optlen)
3687 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3688 struct sctp_authkeyid val;
3689 struct sctp_association *asoc;
3691 if (!ep->auth_enable)
3694 if (optlen != sizeof(struct sctp_authkeyid))
3696 if (copy_from_user(&val, optval, optlen))
3699 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3700 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3703 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3708 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3710 * This set option will deactivate a shared secret key.
3712 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3713 unsigned int optlen)
3715 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3716 struct sctp_authkeyid val;
3717 struct sctp_association *asoc;
3719 if (!ep->auth_enable)
3722 if (optlen != sizeof(struct sctp_authkeyid))
3724 if (copy_from_user(&val, optval, optlen))
3727 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3728 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3731 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3735 * 8.1.23 SCTP_AUTO_ASCONF
3737 * This option will enable or disable the use of the automatic generation of
3738 * ASCONF chunks to add and delete addresses to an existing association. Note
3739 * that this option has two caveats namely: a) it only affects sockets that
3740 * are bound to all addresses available to the SCTP stack, and b) the system
3741 * administrator may have an overriding control that turns the ASCONF feature
3742 * off no matter what setting the socket option may have.
3743 * This option expects an integer boolean flag, where a non-zero value turns on
3744 * the option, and a zero value turns off the option.
3745 * Note. In this implementation, socket operation overrides default parameter
3746 * being set by sysctl as well as FreeBSD implementation
3748 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3749 unsigned int optlen)
3752 struct sctp_sock *sp = sctp_sk(sk);
3754 if (optlen < sizeof(int))
3756 if (get_user(val, (int __user *)optval))
3758 if (!sctp_is_ep_boundall(sk) && val)
3760 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3763 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3764 if (val == 0 && sp->do_auto_asconf) {
3765 list_del(&sp->auto_asconf_list);
3766 sp->do_auto_asconf = 0;
3767 } else if (val && !sp->do_auto_asconf) {
3768 list_add_tail(&sp->auto_asconf_list,
3769 &sock_net(sk)->sctp.auto_asconf_splist);
3770 sp->do_auto_asconf = 1;
3772 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3777 * SCTP_PEER_ADDR_THLDS
3779 * This option allows us to alter the partially failed threshold for one or all
3780 * transports in an association. See Section 6.1 of:
3781 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3783 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3784 char __user *optval,
3785 unsigned int optlen)
3787 struct sctp_paddrthlds val;
3788 struct sctp_transport *trans;
3789 struct sctp_association *asoc;
3791 if (optlen < sizeof(struct sctp_paddrthlds))
3793 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3794 sizeof(struct sctp_paddrthlds)))
3798 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3799 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3802 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3804 if (val.spt_pathmaxrxt)
3805 trans->pathmaxrxt = val.spt_pathmaxrxt;
3806 trans->pf_retrans = val.spt_pathpfthld;
3809 if (val.spt_pathmaxrxt)
3810 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3811 asoc->pf_retrans = val.spt_pathpfthld;
3813 trans = sctp_addr_id2transport(sk, &val.spt_address,
3818 if (val.spt_pathmaxrxt)
3819 trans->pathmaxrxt = val.spt_pathmaxrxt;
3820 trans->pf_retrans = val.spt_pathpfthld;
3826 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3827 char __user *optval,
3828 unsigned int optlen)
3832 if (optlen < sizeof(int))
3834 if (get_user(val, (int __user *) optval))
3837 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3842 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3843 char __user *optval,
3844 unsigned int optlen)
3848 if (optlen < sizeof(int))
3850 if (get_user(val, (int __user *) optval))
3853 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3858 static int sctp_setsockopt_pr_supported(struct sock *sk,
3859 char __user *optval,
3860 unsigned int optlen)
3862 struct sctp_assoc_value params;
3863 struct sctp_association *asoc;
3864 int retval = -EINVAL;
3866 if (optlen != sizeof(params))
3869 if (copy_from_user(¶ms, optval, optlen)) {
3874 asoc = sctp_id2assoc(sk, params.assoc_id);
3876 asoc->prsctp_enable = !!params.assoc_value;
3877 } else if (!params.assoc_id) {
3878 struct sctp_sock *sp = sctp_sk(sk);
3880 sp->ep->prsctp_enable = !!params.assoc_value;
3891 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3892 char __user *optval,
3893 unsigned int optlen)
3895 struct sctp_default_prinfo info;
3896 struct sctp_association *asoc;
3897 int retval = -EINVAL;
3899 if (optlen != sizeof(info))
3902 if (copy_from_user(&info, optval, sizeof(info))) {
3907 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3910 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3913 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3915 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3916 asoc->default_timetolive = info.pr_value;
3917 } else if (!info.pr_assoc_id) {
3918 struct sctp_sock *sp = sctp_sk(sk);
3920 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3921 sp->default_timetolive = info.pr_value;
3932 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3933 char __user *optval,
3934 unsigned int optlen)
3936 struct sctp_assoc_value params;
3937 struct sctp_association *asoc;
3938 int retval = -EINVAL;
3940 if (optlen != sizeof(params))
3943 if (copy_from_user(¶ms, optval, optlen)) {
3948 asoc = sctp_id2assoc(sk, params.assoc_id);
3950 asoc->reconf_enable = !!params.assoc_value;
3951 } else if (!params.assoc_id) {
3952 struct sctp_sock *sp = sctp_sk(sk);
3954 sp->ep->reconf_enable = !!params.assoc_value;
3965 static int sctp_setsockopt_enable_strreset(struct sock *sk,
3966 char __user *optval,
3967 unsigned int optlen)
3969 struct sctp_assoc_value params;
3970 struct sctp_association *asoc;
3971 int retval = -EINVAL;
3973 if (optlen != sizeof(params))
3976 if (copy_from_user(¶ms, optval, optlen)) {
3981 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3984 asoc = sctp_id2assoc(sk, params.assoc_id);
3986 asoc->strreset_enable = params.assoc_value;
3987 } else if (!params.assoc_id) {
3988 struct sctp_sock *sp = sctp_sk(sk);
3990 sp->ep->strreset_enable = params.assoc_value;
4001 static int sctp_setsockopt_reset_streams(struct sock *sk,
4002 char __user *optval,
4003 unsigned int optlen)
4005 struct sctp_reset_streams *params;
4006 struct sctp_association *asoc;
4007 int retval = -EINVAL;
4009 if (optlen < sizeof(*params))
4011 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4012 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4013 sizeof(__u16) * sizeof(*params));
4015 params = memdup_user(optval, optlen);
4017 return PTR_ERR(params);
4019 if (params->srs_number_streams * sizeof(__u16) >
4020 optlen - sizeof(*params))
4023 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4027 retval = sctp_send_reset_streams(asoc, params);
4034 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4035 char __user *optval,
4036 unsigned int optlen)
4038 struct sctp_association *asoc;
4039 sctp_assoc_t associd;
4040 int retval = -EINVAL;
4042 if (optlen != sizeof(associd))
4045 if (copy_from_user(&associd, optval, optlen)) {
4050 asoc = sctp_id2assoc(sk, associd);
4054 retval = sctp_send_reset_assoc(asoc);
4060 static int sctp_setsockopt_add_streams(struct sock *sk,
4061 char __user *optval,
4062 unsigned int optlen)
4064 struct sctp_association *asoc;
4065 struct sctp_add_streams params;
4066 int retval = -EINVAL;
4068 if (optlen != sizeof(params))
4071 if (copy_from_user(¶ms, optval, optlen)) {
4076 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4080 retval = sctp_send_add_streams(asoc, ¶ms);
4086 static int sctp_setsockopt_scheduler(struct sock *sk,
4087 char __user *optval,
4088 unsigned int optlen)
4090 struct sctp_association *asoc;
4091 struct sctp_assoc_value params;
4092 int retval = -EINVAL;
4094 if (optlen < sizeof(params))
4097 optlen = sizeof(params);
4098 if (copy_from_user(¶ms, optval, optlen)) {
4103 if (params.assoc_value > SCTP_SS_MAX)
4106 asoc = sctp_id2assoc(sk, params.assoc_id);
4110 retval = sctp_sched_set_sched(asoc, params.assoc_value);
4116 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4117 char __user *optval,
4118 unsigned int optlen)
4120 struct sctp_association *asoc;
4121 struct sctp_stream_value params;
4122 int retval = -EINVAL;
4124 if (optlen < sizeof(params))
4127 optlen = sizeof(params);
4128 if (copy_from_user(¶ms, optval, optlen)) {
4133 asoc = sctp_id2assoc(sk, params.assoc_id);
4137 retval = sctp_sched_set_value(asoc, params.stream_id,
4138 params.stream_value, GFP_KERNEL);
4144 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4145 char __user *optval,
4146 unsigned int optlen)
4148 struct sctp_sock *sp = sctp_sk(sk);
4149 struct net *net = sock_net(sk);
4150 struct sctp_assoc_value params;
4151 int retval = -EINVAL;
4153 if (optlen < sizeof(params))
4156 optlen = sizeof(params);
4157 if (copy_from_user(¶ms, optval, optlen)) {
4162 if (params.assoc_id)
4165 if (!net->sctp.intl_enable || !sp->frag_interleave) {
4170 sp->strm_interleave = !!params.assoc_value;
4178 /* API 6.2 setsockopt(), getsockopt()
4180 * Applications use setsockopt() and getsockopt() to set or retrieve
4181 * socket options. Socket options are used to change the default
4182 * behavior of sockets calls. They are described in Section 7.
4186 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4187 * int __user *optlen);
4188 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4191 * sd - the socket descript.
4192 * level - set to IPPROTO_SCTP for all SCTP options.
4193 * optname - the option name.
4194 * optval - the buffer to store the value of the option.
4195 * optlen - the size of the buffer.
4197 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4198 char __user *optval, unsigned int optlen)
4202 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4204 /* I can hardly begin to describe how wrong this is. This is
4205 * so broken as to be worse than useless. The API draft
4206 * REALLY is NOT helpful here... I am not convinced that the
4207 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4208 * are at all well-founded.
4210 if (level != SOL_SCTP) {
4211 struct sctp_af *af = sctp_sk(sk)->pf->af;
4212 retval = af->setsockopt(sk, level, optname, optval, optlen);
4219 case SCTP_SOCKOPT_BINDX_ADD:
4220 /* 'optlen' is the size of the addresses buffer. */
4221 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4222 optlen, SCTP_BINDX_ADD_ADDR);
4225 case SCTP_SOCKOPT_BINDX_REM:
4226 /* 'optlen' is the size of the addresses buffer. */
4227 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4228 optlen, SCTP_BINDX_REM_ADDR);
4231 case SCTP_SOCKOPT_CONNECTX_OLD:
4232 /* 'optlen' is the size of the addresses buffer. */
4233 retval = sctp_setsockopt_connectx_old(sk,
4234 (struct sockaddr __user *)optval,
4238 case SCTP_SOCKOPT_CONNECTX:
4239 /* 'optlen' is the size of the addresses buffer. */
4240 retval = sctp_setsockopt_connectx(sk,
4241 (struct sockaddr __user *)optval,
4245 case SCTP_DISABLE_FRAGMENTS:
4246 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4250 retval = sctp_setsockopt_events(sk, optval, optlen);
4253 case SCTP_AUTOCLOSE:
4254 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4257 case SCTP_PEER_ADDR_PARAMS:
4258 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4261 case SCTP_DELAYED_SACK:
4262 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4264 case SCTP_PARTIAL_DELIVERY_POINT:
4265 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4269 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4271 case SCTP_DEFAULT_SEND_PARAM:
4272 retval = sctp_setsockopt_default_send_param(sk, optval,
4275 case SCTP_DEFAULT_SNDINFO:
4276 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4278 case SCTP_PRIMARY_ADDR:
4279 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4281 case SCTP_SET_PEER_PRIMARY_ADDR:
4282 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4285 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4288 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4290 case SCTP_ASSOCINFO:
4291 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4293 case SCTP_I_WANT_MAPPED_V4_ADDR:
4294 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4297 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4299 case SCTP_ADAPTATION_LAYER:
4300 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4303 retval = sctp_setsockopt_context(sk, optval, optlen);
4305 case SCTP_FRAGMENT_INTERLEAVE:
4306 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4308 case SCTP_MAX_BURST:
4309 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4311 case SCTP_AUTH_CHUNK:
4312 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4314 case SCTP_HMAC_IDENT:
4315 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4318 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4320 case SCTP_AUTH_ACTIVE_KEY:
4321 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4323 case SCTP_AUTH_DELETE_KEY:
4324 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4326 case SCTP_AUTH_DEACTIVATE_KEY:
4327 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4329 case SCTP_AUTO_ASCONF:
4330 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4332 case SCTP_PEER_ADDR_THLDS:
4333 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4335 case SCTP_RECVRCVINFO:
4336 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4338 case SCTP_RECVNXTINFO:
4339 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4341 case SCTP_PR_SUPPORTED:
4342 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4344 case SCTP_DEFAULT_PRINFO:
4345 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4347 case SCTP_RECONFIG_SUPPORTED:
4348 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4350 case SCTP_ENABLE_STREAM_RESET:
4351 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4353 case SCTP_RESET_STREAMS:
4354 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4356 case SCTP_RESET_ASSOC:
4357 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4359 case SCTP_ADD_STREAMS:
4360 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4362 case SCTP_STREAM_SCHEDULER:
4363 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4365 case SCTP_STREAM_SCHEDULER_VALUE:
4366 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4368 case SCTP_INTERLEAVING_SUPPORTED:
4369 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4373 retval = -ENOPROTOOPT;
4383 /* API 3.1.6 connect() - UDP Style Syntax
4385 * An application may use the connect() call in the UDP model to initiate an
4386 * association without sending data.
4390 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4392 * sd: the socket descriptor to have a new association added to.
4394 * nam: the address structure (either struct sockaddr_in or struct
4395 * sockaddr_in6 defined in RFC2553 [7]).
4397 * len: the size of the address.
4399 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4407 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4410 /* Validate addr_len before calling common connect/connectx routine. */
4411 af = sctp_get_af_specific(addr->sa_family);
4412 if (!af || addr_len < af->sockaddr_len) {
4415 /* Pass correct addr len to common routine (so it knows there
4416 * is only one address being passed.
4418 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
4425 /* FIXME: Write comments. */
4426 static int sctp_disconnect(struct sock *sk, int flags)
4428 return -EOPNOTSUPP; /* STUB */
4431 /* 4.1.4 accept() - TCP Style Syntax
4433 * Applications use accept() call to remove an established SCTP
4434 * association from the accept queue of the endpoint. A new socket
4435 * descriptor will be returned from accept() to represent the newly
4436 * formed association.
4438 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4440 struct sctp_sock *sp;
4441 struct sctp_endpoint *ep;
4442 struct sock *newsk = NULL;
4443 struct sctp_association *asoc;
4452 if (!sctp_style(sk, TCP)) {
4453 error = -EOPNOTSUPP;
4457 if (!sctp_sstate(sk, LISTENING)) {
4462 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4464 error = sctp_wait_for_accept(sk, timeo);
4468 /* We treat the list of associations on the endpoint as the accept
4469 * queue and pick the first association on the list.
4471 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4473 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4479 /* Populate the fields of the newsk from the oldsk and migrate the
4480 * asoc to the newsk.
4482 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4490 /* The SCTP ioctl handler. */
4491 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4498 * SEQPACKET-style sockets in LISTENING state are valid, for
4499 * SCTP, so only discard TCP-style sockets in LISTENING state.
4501 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4506 struct sk_buff *skb;
4507 unsigned int amount = 0;
4509 skb = skb_peek(&sk->sk_receive_queue);
4512 * We will only return the amount of this packet since
4513 * that is all that will be read.
4517 rc = put_user(amount, (int __user *)arg);
4529 /* This is the function which gets called during socket creation to
4530 * initialized the SCTP-specific portion of the sock.
4531 * The sock structure should already be zero-filled memory.
4533 static int sctp_init_sock(struct sock *sk)
4535 struct net *net = sock_net(sk);
4536 struct sctp_sock *sp;
4538 pr_debug("%s: sk:%p\n", __func__, sk);
4542 /* Initialize the SCTP per socket area. */
4543 switch (sk->sk_type) {
4544 case SOCK_SEQPACKET:
4545 sp->type = SCTP_SOCKET_UDP;
4548 sp->type = SCTP_SOCKET_TCP;
4551 return -ESOCKTNOSUPPORT;
4554 sk->sk_gso_type = SKB_GSO_SCTP;
4556 /* Initialize default send parameters. These parameters can be
4557 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4559 sp->default_stream = 0;
4560 sp->default_ppid = 0;
4561 sp->default_flags = 0;
4562 sp->default_context = 0;
4563 sp->default_timetolive = 0;
4565 sp->default_rcv_context = 0;
4566 sp->max_burst = net->sctp.max_burst;
4568 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4570 /* Initialize default setup parameters. These parameters
4571 * can be modified with the SCTP_INITMSG socket option or
4572 * overridden by the SCTP_INIT CMSG.
4574 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4575 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4576 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4577 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4579 /* Initialize default RTO related parameters. These parameters can
4580 * be modified for with the SCTP_RTOINFO socket option.
4582 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4583 sp->rtoinfo.srto_max = net->sctp.rto_max;
4584 sp->rtoinfo.srto_min = net->sctp.rto_min;
4586 /* Initialize default association related parameters. These parameters
4587 * can be modified with the SCTP_ASSOCINFO socket option.
4589 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4590 sp->assocparams.sasoc_number_peer_destinations = 0;
4591 sp->assocparams.sasoc_peer_rwnd = 0;
4592 sp->assocparams.sasoc_local_rwnd = 0;
4593 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4595 /* Initialize default event subscriptions. By default, all the
4598 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4600 /* Default Peer Address Parameters. These defaults can
4601 * be modified via SCTP_PEER_ADDR_PARAMS
4603 sp->hbinterval = net->sctp.hb_interval;
4604 sp->pathmaxrxt = net->sctp.max_retrans_path;
4605 sp->pathmtu = 0; /* allow default discovery */
4606 sp->sackdelay = net->sctp.sack_timeout;
4608 sp->param_flags = SPP_HB_ENABLE |
4610 SPP_SACKDELAY_ENABLE;
4612 /* If enabled no SCTP message fragmentation will be performed.
4613 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4615 sp->disable_fragments = 0;
4617 /* Enable Nagle algorithm by default. */
4620 sp->recvrcvinfo = 0;
4621 sp->recvnxtinfo = 0;
4623 /* Enable by default. */
4626 /* Auto-close idle associations after the configured
4627 * number of seconds. A value of 0 disables this
4628 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4629 * for UDP-style sockets only.
4633 /* User specified fragmentation limit. */
4636 sp->adaptation_ind = 0;
4638 sp->pf = sctp_get_pf_specific(sk->sk_family);
4640 /* Control variables for partial data delivery. */
4641 atomic_set(&sp->pd_mode, 0);
4642 skb_queue_head_init(&sp->pd_lobby);
4643 sp->frag_interleave = 0;
4645 /* Create a per socket endpoint structure. Even if we
4646 * change the data structure relationships, this may still
4647 * be useful for storing pre-connect address information.
4649 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4655 sk->sk_destruct = sctp_destruct_sock;
4657 SCTP_DBG_OBJCNT_INC(sock);
4660 sk_sockets_allocated_inc(sk);
4661 sock_prot_inuse_add(net, sk->sk_prot, 1);
4663 /* Nothing can fail after this block, otherwise
4664 * sctp_destroy_sock() will be called without addr_wq_lock held
4666 if (net->sctp.default_auto_asconf) {
4667 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4668 list_add_tail(&sp->auto_asconf_list,
4669 &net->sctp.auto_asconf_splist);
4670 sp->do_auto_asconf = 1;
4671 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4673 sp->do_auto_asconf = 0;
4681 /* Cleanup any SCTP per socket resources. Must be called with
4682 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4684 static void sctp_destroy_sock(struct sock *sk)
4686 struct sctp_sock *sp;
4688 pr_debug("%s: sk:%p\n", __func__, sk);
4690 /* Release our hold on the endpoint. */
4692 /* This could happen during socket init, thus we bail out
4693 * early, since the rest of the below is not setup either.
4698 if (sp->do_auto_asconf) {
4699 sp->do_auto_asconf = 0;
4700 list_del(&sp->auto_asconf_list);
4702 sctp_endpoint_free(sp->ep);
4704 sk_sockets_allocated_dec(sk);
4705 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4709 /* Triggered when there are no references on the socket anymore */
4710 static void sctp_destruct_sock(struct sock *sk)
4712 struct sctp_sock *sp = sctp_sk(sk);
4714 /* Free up the HMAC transform. */
4715 crypto_free_shash(sp->hmac);
4717 inet_sock_destruct(sk);
4720 /* API 4.1.7 shutdown() - TCP Style Syntax
4721 * int shutdown(int socket, int how);
4723 * sd - the socket descriptor of the association to be closed.
4724 * how - Specifies the type of shutdown. The values are
4727 * Disables further receive operations. No SCTP
4728 * protocol action is taken.
4730 * Disables further send operations, and initiates
4731 * the SCTP shutdown sequence.
4733 * Disables further send and receive operations
4734 * and initiates the SCTP shutdown sequence.
4736 static void sctp_shutdown(struct sock *sk, int how)
4738 struct net *net = sock_net(sk);
4739 struct sctp_endpoint *ep;
4741 if (!sctp_style(sk, TCP))
4744 ep = sctp_sk(sk)->ep;
4745 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4746 struct sctp_association *asoc;
4748 inet_sk_set_state(sk, SCTP_SS_CLOSING);
4749 asoc = list_entry(ep->asocs.next,
4750 struct sctp_association, asocs);
4751 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4755 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4756 struct sctp_info *info)
4758 struct sctp_transport *prim;
4759 struct list_head *pos;
4762 memset(info, 0, sizeof(*info));
4764 struct sctp_sock *sp = sctp_sk(sk);
4766 info->sctpi_s_autoclose = sp->autoclose;
4767 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4768 info->sctpi_s_pd_point = sp->pd_point;
4769 info->sctpi_s_nodelay = sp->nodelay;
4770 info->sctpi_s_disable_fragments = sp->disable_fragments;
4771 info->sctpi_s_v4mapped = sp->v4mapped;
4772 info->sctpi_s_frag_interleave = sp->frag_interleave;
4773 info->sctpi_s_type = sp->type;
4778 info->sctpi_tag = asoc->c.my_vtag;
4779 info->sctpi_state = asoc->state;
4780 info->sctpi_rwnd = asoc->a_rwnd;
4781 info->sctpi_unackdata = asoc->unack_data;
4782 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4783 info->sctpi_instrms = asoc->stream.incnt;
4784 info->sctpi_outstrms = asoc->stream.outcnt;
4785 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4786 info->sctpi_inqueue++;
4787 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4788 info->sctpi_outqueue++;
4789 info->sctpi_overall_error = asoc->overall_error_count;
4790 info->sctpi_max_burst = asoc->max_burst;
4791 info->sctpi_maxseg = asoc->frag_point;
4792 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4793 info->sctpi_peer_tag = asoc->c.peer_vtag;
4795 mask = asoc->peer.ecn_capable << 1;
4796 mask = (mask | asoc->peer.ipv4_address) << 1;
4797 mask = (mask | asoc->peer.ipv6_address) << 1;
4798 mask = (mask | asoc->peer.hostname_address) << 1;
4799 mask = (mask | asoc->peer.asconf_capable) << 1;
4800 mask = (mask | asoc->peer.prsctp_capable) << 1;
4801 mask = (mask | asoc->peer.auth_capable);
4802 info->sctpi_peer_capable = mask;
4803 mask = asoc->peer.sack_needed << 1;
4804 mask = (mask | asoc->peer.sack_generation) << 1;
4805 mask = (mask | asoc->peer.zero_window_announced);
4806 info->sctpi_peer_sack = mask;
4808 info->sctpi_isacks = asoc->stats.isacks;
4809 info->sctpi_osacks = asoc->stats.osacks;
4810 info->sctpi_opackets = asoc->stats.opackets;
4811 info->sctpi_ipackets = asoc->stats.ipackets;
4812 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4813 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4814 info->sctpi_idupchunks = asoc->stats.idupchunks;
4815 info->sctpi_gapcnt = asoc->stats.gapcnt;
4816 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4817 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4818 info->sctpi_oodchunks = asoc->stats.oodchunks;
4819 info->sctpi_iodchunks = asoc->stats.iodchunks;
4820 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4821 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4823 prim = asoc->peer.primary_path;
4824 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4825 info->sctpi_p_state = prim->state;
4826 info->sctpi_p_cwnd = prim->cwnd;
4827 info->sctpi_p_srtt = prim->srtt;
4828 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4829 info->sctpi_p_hbinterval = prim->hbinterval;
4830 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4831 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4832 info->sctpi_p_ssthresh = prim->ssthresh;
4833 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4834 info->sctpi_p_flight_size = prim->flight_size;
4835 info->sctpi_p_error = prim->error_count;
4839 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4841 /* use callback to avoid exporting the core structure */
4842 void sctp_transport_walk_start(struct rhashtable_iter *iter)
4844 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4846 rhashtable_walk_start(iter);
4849 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4851 rhashtable_walk_stop(iter);
4852 rhashtable_walk_exit(iter);
4855 struct sctp_transport *sctp_transport_get_next(struct net *net,
4856 struct rhashtable_iter *iter)
4858 struct sctp_transport *t;
4860 t = rhashtable_walk_next(iter);
4861 for (; t; t = rhashtable_walk_next(iter)) {
4863 if (PTR_ERR(t) == -EAGAIN)
4868 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4869 t->asoc->peer.primary_path == t)
4876 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4877 struct rhashtable_iter *iter,
4880 void *obj = SEQ_START_TOKEN;
4882 while (pos && (obj = sctp_transport_get_next(net, iter)) &&
4889 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4893 struct sctp_ep_common *epb;
4894 struct sctp_hashbucket *head;
4896 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4898 read_lock_bh(&head->lock);
4899 sctp_for_each_hentry(epb, &head->chain) {
4900 err = cb(sctp_ep(epb), p);
4904 read_unlock_bh(&head->lock);
4909 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4911 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4913 const union sctp_addr *laddr,
4914 const union sctp_addr *paddr, void *p)
4916 struct sctp_transport *transport;
4920 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4925 err = cb(transport, p);
4926 sctp_transport_put(transport);
4930 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4932 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4933 int (*cb_done)(struct sctp_transport *, void *),
4934 struct net *net, int *pos, void *p) {
4935 struct rhashtable_iter hti;
4936 struct sctp_transport *tsp;
4941 sctp_transport_walk_start(&hti);
4943 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
4944 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
4945 if (!sctp_transport_hold(tsp))
4951 sctp_transport_put(tsp);
4953 sctp_transport_walk_stop(&hti);
4956 if (cb_done && !cb_done(tsp, p)) {
4958 sctp_transport_put(tsp);
4961 sctp_transport_put(tsp);
4966 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
4968 /* 7.2.1 Association Status (SCTP_STATUS)
4970 * Applications can retrieve current status information about an
4971 * association, including association state, peer receiver window size,
4972 * number of unacked data chunks, and number of data chunks pending
4973 * receipt. This information is read-only.
4975 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4976 char __user *optval,
4979 struct sctp_status status;
4980 struct sctp_association *asoc = NULL;
4981 struct sctp_transport *transport;
4982 sctp_assoc_t associd;
4985 if (len < sizeof(status)) {
4990 len = sizeof(status);
4991 if (copy_from_user(&status, optval, len)) {
4996 associd = status.sstat_assoc_id;
4997 asoc = sctp_id2assoc(sk, associd);
5003 transport = asoc->peer.primary_path;
5005 status.sstat_assoc_id = sctp_assoc2id(asoc);
5006 status.sstat_state = sctp_assoc_to_state(asoc);
5007 status.sstat_rwnd = asoc->peer.rwnd;
5008 status.sstat_unackdata = asoc->unack_data;
5010 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5011 status.sstat_instrms = asoc->stream.incnt;
5012 status.sstat_outstrms = asoc->stream.outcnt;
5013 status.sstat_fragmentation_point = asoc->frag_point;
5014 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5015 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5016 transport->af_specific->sockaddr_len);
5017 /* Map ipv4 address into v4-mapped-on-v6 address. */
5018 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5019 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5020 status.sstat_primary.spinfo_state = transport->state;
5021 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5022 status.sstat_primary.spinfo_srtt = transport->srtt;
5023 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5024 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5026 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5027 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5029 if (put_user(len, optlen)) {
5034 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5035 __func__, len, status.sstat_state, status.sstat_rwnd,
5036 status.sstat_assoc_id);
5038 if (copy_to_user(optval, &status, len)) {
5048 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5050 * Applications can retrieve information about a specific peer address
5051 * of an association, including its reachability state, congestion
5052 * window, and retransmission timer values. This information is
5055 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5056 char __user *optval,
5059 struct sctp_paddrinfo pinfo;
5060 struct sctp_transport *transport;
5063 if (len < sizeof(pinfo)) {
5068 len = sizeof(pinfo);
5069 if (copy_from_user(&pinfo, optval, len)) {
5074 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5075 pinfo.spinfo_assoc_id);
5079 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5080 pinfo.spinfo_state = transport->state;
5081 pinfo.spinfo_cwnd = transport->cwnd;
5082 pinfo.spinfo_srtt = transport->srtt;
5083 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5084 pinfo.spinfo_mtu = transport->pathmtu;
5086 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5087 pinfo.spinfo_state = SCTP_ACTIVE;
5089 if (put_user(len, optlen)) {
5094 if (copy_to_user(optval, &pinfo, len)) {
5103 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5105 * This option is a on/off flag. If enabled no SCTP message
5106 * fragmentation will be performed. Instead if a message being sent
5107 * exceeds the current PMTU size, the message will NOT be sent and
5108 * instead a error will be indicated to the user.
5110 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5111 char __user *optval, int __user *optlen)
5115 if (len < sizeof(int))
5119 val = (sctp_sk(sk)->disable_fragments == 1);
5120 if (put_user(len, optlen))
5122 if (copy_to_user(optval, &val, len))
5127 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5129 * This socket option is used to specify various notifications and
5130 * ancillary data the user wishes to receive.
5132 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5137 if (len > sizeof(struct sctp_event_subscribe))
5138 len = sizeof(struct sctp_event_subscribe);
5139 if (put_user(len, optlen))
5141 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
5146 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5148 * This socket option is applicable to the UDP-style socket only. When
5149 * set it will cause associations that are idle for more than the
5150 * specified number of seconds to automatically close. An association
5151 * being idle is defined an association that has NOT sent or received
5152 * user data. The special value of '0' indicates that no automatic
5153 * close of any associations should be performed. The option expects an
5154 * integer defining the number of seconds of idle time before an
5155 * association is closed.
5157 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5159 /* Applicable to UDP-style socket only */
5160 if (sctp_style(sk, TCP))
5162 if (len < sizeof(int))
5165 if (put_user(len, optlen))
5167 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5172 /* Helper routine to branch off an association to a new socket. */
5173 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5175 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5176 struct sctp_sock *sp = sctp_sk(sk);
5177 struct socket *sock;
5180 /* Do not peel off from one netns to another one. */
5181 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5187 /* An association cannot be branched off from an already peeled-off
5188 * socket, nor is this supported for tcp style sockets.
5190 if (!sctp_style(sk, UDP))
5193 /* Create a new socket. */
5194 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5198 sctp_copy_sock(sock->sk, sk, asoc);
5200 /* Make peeled-off sockets more like 1-1 accepted sockets.
5201 * Set the daddr and initialize id to something more random and also
5202 * copy over any ip options.
5204 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5205 sp->pf->copy_ip_options(sk, sock->sk);
5207 /* Populate the fields of the newsk from the oldsk and migrate the
5208 * asoc to the newsk.
5210 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5216 EXPORT_SYMBOL(sctp_do_peeloff);
5218 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5219 struct file **newfile, unsigned flags)
5221 struct socket *newsock;
5224 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5228 /* Map the socket to an unused fd that can be returned to the user. */
5229 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5231 sock_release(newsock);
5235 *newfile = sock_alloc_file(newsock, 0, NULL);
5236 if (IS_ERR(*newfile)) {
5237 put_unused_fd(retval);
5238 retval = PTR_ERR(*newfile);
5243 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5246 peeloff->sd = retval;
5248 if (flags & SOCK_NONBLOCK)
5249 (*newfile)->f_flags |= O_NONBLOCK;
5254 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5256 sctp_peeloff_arg_t peeloff;
5257 struct file *newfile = NULL;
5260 if (len < sizeof(sctp_peeloff_arg_t))
5262 len = sizeof(sctp_peeloff_arg_t);
5263 if (copy_from_user(&peeloff, optval, len))
5266 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5270 /* Return the fd mapped to the new socket. */
5271 if (put_user(len, optlen)) {
5273 put_unused_fd(retval);
5277 if (copy_to_user(optval, &peeloff, len)) {
5279 put_unused_fd(retval);
5282 fd_install(retval, newfile);
5287 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5288 char __user *optval, int __user *optlen)
5290 sctp_peeloff_flags_arg_t peeloff;
5291 struct file *newfile = NULL;
5294 if (len < sizeof(sctp_peeloff_flags_arg_t))
5296 len = sizeof(sctp_peeloff_flags_arg_t);
5297 if (copy_from_user(&peeloff, optval, len))
5300 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5301 &newfile, peeloff.flags);
5305 /* Return the fd mapped to the new socket. */
5306 if (put_user(len, optlen)) {
5308 put_unused_fd(retval);
5312 if (copy_to_user(optval, &peeloff, len)) {
5314 put_unused_fd(retval);
5317 fd_install(retval, newfile);
5322 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5324 * Applications can enable or disable heartbeats for any peer address of
5325 * an association, modify an address's heartbeat interval, force a
5326 * heartbeat to be sent immediately, and adjust the address's maximum
5327 * number of retransmissions sent before an address is considered
5328 * unreachable. The following structure is used to access and modify an
5329 * address's parameters:
5331 * struct sctp_paddrparams {
5332 * sctp_assoc_t spp_assoc_id;
5333 * struct sockaddr_storage spp_address;
5334 * uint32_t spp_hbinterval;
5335 * uint16_t spp_pathmaxrxt;
5336 * uint32_t spp_pathmtu;
5337 * uint32_t spp_sackdelay;
5338 * uint32_t spp_flags;
5341 * spp_assoc_id - (one-to-many style socket) This is filled in the
5342 * application, and identifies the association for
5344 * spp_address - This specifies which address is of interest.
5345 * spp_hbinterval - This contains the value of the heartbeat interval,
5346 * in milliseconds. If a value of zero
5347 * is present in this field then no changes are to
5348 * be made to this parameter.
5349 * spp_pathmaxrxt - This contains the maximum number of
5350 * retransmissions before this address shall be
5351 * considered unreachable. If a value of zero
5352 * is present in this field then no changes are to
5353 * be made to this parameter.
5354 * spp_pathmtu - When Path MTU discovery is disabled the value
5355 * specified here will be the "fixed" path mtu.
5356 * Note that if the spp_address field is empty
5357 * then all associations on this address will
5358 * have this fixed path mtu set upon them.
5360 * spp_sackdelay - When delayed sack is enabled, this value specifies
5361 * the number of milliseconds that sacks will be delayed
5362 * for. This value will apply to all addresses of an
5363 * association if the spp_address field is empty. Note
5364 * also, that if delayed sack is enabled and this
5365 * value is set to 0, no change is made to the last
5366 * recorded delayed sack timer value.
5368 * spp_flags - These flags are used to control various features
5369 * on an association. The flag field may contain
5370 * zero or more of the following options.
5372 * SPP_HB_ENABLE - Enable heartbeats on the
5373 * specified address. Note that if the address
5374 * field is empty all addresses for the association
5375 * have heartbeats enabled upon them.
5377 * SPP_HB_DISABLE - Disable heartbeats on the
5378 * speicifed address. Note that if the address
5379 * field is empty all addresses for the association
5380 * will have their heartbeats disabled. Note also
5381 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5382 * mutually exclusive, only one of these two should
5383 * be specified. Enabling both fields will have
5384 * undetermined results.
5386 * SPP_HB_DEMAND - Request a user initiated heartbeat
5387 * to be made immediately.
5389 * SPP_PMTUD_ENABLE - This field will enable PMTU
5390 * discovery upon the specified address. Note that
5391 * if the address feild is empty then all addresses
5392 * on the association are effected.
5394 * SPP_PMTUD_DISABLE - This field will disable PMTU
5395 * discovery upon the specified address. Note that
5396 * if the address feild is empty then all addresses
5397 * on the association are effected. Not also that
5398 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5399 * exclusive. Enabling both will have undetermined
5402 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5403 * on delayed sack. The time specified in spp_sackdelay
5404 * is used to specify the sack delay for this address. Note
5405 * that if spp_address is empty then all addresses will
5406 * enable delayed sack and take on the sack delay
5407 * value specified in spp_sackdelay.
5408 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5409 * off delayed sack. If the spp_address field is blank then
5410 * delayed sack is disabled for the entire association. Note
5411 * also that this field is mutually exclusive to
5412 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5415 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5416 char __user *optval, int __user *optlen)
5418 struct sctp_paddrparams params;
5419 struct sctp_transport *trans = NULL;
5420 struct sctp_association *asoc = NULL;
5421 struct sctp_sock *sp = sctp_sk(sk);
5423 if (len < sizeof(struct sctp_paddrparams))
5425 len = sizeof(struct sctp_paddrparams);
5426 if (copy_from_user(¶ms, optval, len))
5429 /* If an address other than INADDR_ANY is specified, and
5430 * no transport is found, then the request is invalid.
5432 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5433 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5434 params.spp_assoc_id);
5436 pr_debug("%s: failed no transport\n", __func__);
5441 /* Get association, if assoc_id != 0 and the socket is a one
5442 * to many style socket, and an association was not found, then
5443 * the id was invalid.
5445 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5446 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5447 pr_debug("%s: failed no association\n", __func__);
5452 /* Fetch transport values. */
5453 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5454 params.spp_pathmtu = trans->pathmtu;
5455 params.spp_pathmaxrxt = trans->pathmaxrxt;
5456 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5458 /*draft-11 doesn't say what to return in spp_flags*/
5459 params.spp_flags = trans->param_flags;
5461 /* Fetch association values. */
5462 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5463 params.spp_pathmtu = asoc->pathmtu;
5464 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5465 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5467 /*draft-11 doesn't say what to return in spp_flags*/
5468 params.spp_flags = asoc->param_flags;
5470 /* Fetch socket values. */
5471 params.spp_hbinterval = sp->hbinterval;
5472 params.spp_pathmtu = sp->pathmtu;
5473 params.spp_sackdelay = sp->sackdelay;
5474 params.spp_pathmaxrxt = sp->pathmaxrxt;
5476 /*draft-11 doesn't say what to return in spp_flags*/
5477 params.spp_flags = sp->param_flags;
5480 if (copy_to_user(optval, ¶ms, len))
5483 if (put_user(len, optlen))
5490 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5492 * This option will effect the way delayed acks are performed. This
5493 * option allows you to get or set the delayed ack time, in
5494 * milliseconds. It also allows changing the delayed ack frequency.
5495 * Changing the frequency to 1 disables the delayed sack algorithm. If
5496 * the assoc_id is 0, then this sets or gets the endpoints default
5497 * values. If the assoc_id field is non-zero, then the set or get
5498 * effects the specified association for the one to many model (the
5499 * assoc_id field is ignored by the one to one model). Note that if
5500 * sack_delay or sack_freq are 0 when setting this option, then the
5501 * current values will remain unchanged.
5503 * struct sctp_sack_info {
5504 * sctp_assoc_t sack_assoc_id;
5505 * uint32_t sack_delay;
5506 * uint32_t sack_freq;
5509 * sack_assoc_id - This parameter, indicates which association the user
5510 * is performing an action upon. Note that if this field's value is
5511 * zero then the endpoints default value is changed (effecting future
5512 * associations only).
5514 * sack_delay - This parameter contains the number of milliseconds that
5515 * the user is requesting the delayed ACK timer be set to. Note that
5516 * this value is defined in the standard to be between 200 and 500
5519 * sack_freq - This parameter contains the number of packets that must
5520 * be received before a sack is sent without waiting for the delay
5521 * timer to expire. The default value for this is 2, setting this
5522 * value to 1 will disable the delayed sack algorithm.
5524 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5525 char __user *optval,
5528 struct sctp_sack_info params;
5529 struct sctp_association *asoc = NULL;
5530 struct sctp_sock *sp = sctp_sk(sk);
5532 if (len >= sizeof(struct sctp_sack_info)) {
5533 len = sizeof(struct sctp_sack_info);
5535 if (copy_from_user(¶ms, optval, len))
5537 } else if (len == sizeof(struct sctp_assoc_value)) {
5538 pr_warn_ratelimited(DEPRECATED
5540 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5541 "Use struct sctp_sack_info instead\n",
5542 current->comm, task_pid_nr(current));
5543 if (copy_from_user(¶ms, optval, len))
5548 /* Get association, if sack_assoc_id != 0 and the socket is a one
5549 * to many style socket, and an association was not found, then
5550 * the id was invalid.
5552 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5553 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5557 /* Fetch association values. */
5558 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5559 params.sack_delay = jiffies_to_msecs(
5561 params.sack_freq = asoc->sackfreq;
5564 params.sack_delay = 0;
5565 params.sack_freq = 1;
5568 /* Fetch socket values. */
5569 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5570 params.sack_delay = sp->sackdelay;
5571 params.sack_freq = sp->sackfreq;
5573 params.sack_delay = 0;
5574 params.sack_freq = 1;
5578 if (copy_to_user(optval, ¶ms, len))
5581 if (put_user(len, optlen))
5587 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5589 * Applications can specify protocol parameters for the default association
5590 * initialization. The option name argument to setsockopt() and getsockopt()
5593 * Setting initialization parameters is effective only on an unconnected
5594 * socket (for UDP-style sockets only future associations are effected
5595 * by the change). With TCP-style sockets, this option is inherited by
5596 * sockets derived from a listener socket.
5598 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5600 if (len < sizeof(struct sctp_initmsg))
5602 len = sizeof(struct sctp_initmsg);
5603 if (put_user(len, optlen))
5605 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5611 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5612 char __user *optval, int __user *optlen)
5614 struct sctp_association *asoc;
5616 struct sctp_getaddrs getaddrs;
5617 struct sctp_transport *from;
5619 union sctp_addr temp;
5620 struct sctp_sock *sp = sctp_sk(sk);
5625 if (len < sizeof(struct sctp_getaddrs))
5628 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5631 /* For UDP-style sockets, id specifies the association to query. */
5632 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5636 to = optval + offsetof(struct sctp_getaddrs, addrs);
5637 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5639 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5641 memcpy(&temp, &from->ipaddr, sizeof(temp));
5642 addrlen = sctp_get_pf_specific(sk->sk_family)
5643 ->addr_to_user(sp, &temp);
5644 if (space_left < addrlen)
5646 if (copy_to_user(to, &temp, addrlen))
5650 space_left -= addrlen;
5653 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5655 bytes_copied = ((char __user *)to) - optval;
5656 if (put_user(bytes_copied, optlen))
5662 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5663 size_t space_left, int *bytes_copied)
5665 struct sctp_sockaddr_entry *addr;
5666 union sctp_addr temp;
5669 struct net *net = sock_net(sk);
5672 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5676 if ((PF_INET == sk->sk_family) &&
5677 (AF_INET6 == addr->a.sa.sa_family))
5679 if ((PF_INET6 == sk->sk_family) &&
5680 inet_v6_ipv6only(sk) &&
5681 (AF_INET == addr->a.sa.sa_family))
5683 memcpy(&temp, &addr->a, sizeof(temp));
5684 if (!temp.v4.sin_port)
5685 temp.v4.sin_port = htons(port);
5687 addrlen = sctp_get_pf_specific(sk->sk_family)
5688 ->addr_to_user(sctp_sk(sk), &temp);
5690 if (space_left < addrlen) {
5694 memcpy(to, &temp, addrlen);
5698 space_left -= addrlen;
5699 *bytes_copied += addrlen;
5707 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5708 char __user *optval, int __user *optlen)
5710 struct sctp_bind_addr *bp;
5711 struct sctp_association *asoc;
5713 struct sctp_getaddrs getaddrs;
5714 struct sctp_sockaddr_entry *addr;
5716 union sctp_addr temp;
5717 struct sctp_sock *sp = sctp_sk(sk);
5721 int bytes_copied = 0;
5725 if (len < sizeof(struct sctp_getaddrs))
5728 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5732 * For UDP-style sockets, id specifies the association to query.
5733 * If the id field is set to the value '0' then the locally bound
5734 * addresses are returned without regard to any particular
5737 if (0 == getaddrs.assoc_id) {
5738 bp = &sctp_sk(sk)->ep->base.bind_addr;
5740 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5743 bp = &asoc->base.bind_addr;
5746 to = optval + offsetof(struct sctp_getaddrs, addrs);
5747 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5749 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5753 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5754 * addresses from the global local address list.
5756 if (sctp_list_single_entry(&bp->address_list)) {
5757 addr = list_entry(bp->address_list.next,
5758 struct sctp_sockaddr_entry, list);
5759 if (sctp_is_any(sk, &addr->a)) {
5760 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5761 space_left, &bytes_copied);
5771 /* Protection on the bound address list is not needed since
5772 * in the socket option context we hold a socket lock and
5773 * thus the bound address list can't change.
5775 list_for_each_entry(addr, &bp->address_list, list) {
5776 memcpy(&temp, &addr->a, sizeof(temp));
5777 addrlen = sctp_get_pf_specific(sk->sk_family)
5778 ->addr_to_user(sp, &temp);
5779 if (space_left < addrlen) {
5780 err = -ENOMEM; /*fixme: right error?*/
5783 memcpy(buf, &temp, addrlen);
5785 bytes_copied += addrlen;
5787 space_left -= addrlen;
5791 if (copy_to_user(to, addrs, bytes_copied)) {
5795 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5799 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5800 * but we can't change it anymore.
5802 if (put_user(bytes_copied, optlen))
5809 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5811 * Requests that the local SCTP stack use the enclosed peer address as
5812 * the association primary. The enclosed address must be one of the
5813 * association peer's addresses.
5815 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5816 char __user *optval, int __user *optlen)
5818 struct sctp_prim prim;
5819 struct sctp_association *asoc;
5820 struct sctp_sock *sp = sctp_sk(sk);
5822 if (len < sizeof(struct sctp_prim))
5825 len = sizeof(struct sctp_prim);
5827 if (copy_from_user(&prim, optval, len))
5830 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5834 if (!asoc->peer.primary_path)
5837 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5838 asoc->peer.primary_path->af_specific->sockaddr_len);
5840 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5841 (union sctp_addr *)&prim.ssp_addr);
5843 if (put_user(len, optlen))
5845 if (copy_to_user(optval, &prim, len))
5852 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5854 * Requests that the local endpoint set the specified Adaptation Layer
5855 * Indication parameter for all future INIT and INIT-ACK exchanges.
5857 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5858 char __user *optval, int __user *optlen)
5860 struct sctp_setadaptation adaptation;
5862 if (len < sizeof(struct sctp_setadaptation))
5865 len = sizeof(struct sctp_setadaptation);
5867 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5869 if (put_user(len, optlen))
5871 if (copy_to_user(optval, &adaptation, len))
5879 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5881 * Applications that wish to use the sendto() system call may wish to
5882 * specify a default set of parameters that would normally be supplied
5883 * through the inclusion of ancillary data. This socket option allows
5884 * such an application to set the default sctp_sndrcvinfo structure.
5887 * The application that wishes to use this socket option simply passes
5888 * in to this call the sctp_sndrcvinfo structure defined in Section
5889 * 5.2.2) The input parameters accepted by this call include
5890 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5891 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5892 * to this call if the caller is using the UDP model.
5894 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5896 static int sctp_getsockopt_default_send_param(struct sock *sk,
5897 int len, char __user *optval,
5900 struct sctp_sock *sp = sctp_sk(sk);
5901 struct sctp_association *asoc;
5902 struct sctp_sndrcvinfo info;
5904 if (len < sizeof(info))
5909 if (copy_from_user(&info, optval, len))
5912 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5913 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5916 info.sinfo_stream = asoc->default_stream;
5917 info.sinfo_flags = asoc->default_flags;
5918 info.sinfo_ppid = asoc->default_ppid;
5919 info.sinfo_context = asoc->default_context;
5920 info.sinfo_timetolive = asoc->default_timetolive;
5922 info.sinfo_stream = sp->default_stream;
5923 info.sinfo_flags = sp->default_flags;
5924 info.sinfo_ppid = sp->default_ppid;
5925 info.sinfo_context = sp->default_context;
5926 info.sinfo_timetolive = sp->default_timetolive;
5929 if (put_user(len, optlen))
5931 if (copy_to_user(optval, &info, len))
5937 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5938 * (SCTP_DEFAULT_SNDINFO)
5940 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5941 char __user *optval,
5944 struct sctp_sock *sp = sctp_sk(sk);
5945 struct sctp_association *asoc;
5946 struct sctp_sndinfo info;
5948 if (len < sizeof(info))
5953 if (copy_from_user(&info, optval, len))
5956 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5957 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5960 info.snd_sid = asoc->default_stream;
5961 info.snd_flags = asoc->default_flags;
5962 info.snd_ppid = asoc->default_ppid;
5963 info.snd_context = asoc->default_context;
5965 info.snd_sid = sp->default_stream;
5966 info.snd_flags = sp->default_flags;
5967 info.snd_ppid = sp->default_ppid;
5968 info.snd_context = sp->default_context;
5971 if (put_user(len, optlen))
5973 if (copy_to_user(optval, &info, len))
5981 * 7.1.5 SCTP_NODELAY
5983 * Turn on/off any Nagle-like algorithm. This means that packets are
5984 * generally sent as soon as possible and no unnecessary delays are
5985 * introduced, at the cost of more packets in the network. Expects an
5986 * integer boolean flag.
5989 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5990 char __user *optval, int __user *optlen)
5994 if (len < sizeof(int))
5998 val = (sctp_sk(sk)->nodelay == 1);
5999 if (put_user(len, optlen))
6001 if (copy_to_user(optval, &val, len))
6008 * 7.1.1 SCTP_RTOINFO
6010 * The protocol parameters used to initialize and bound retransmission
6011 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6012 * and modify these parameters.
6013 * All parameters are time values, in milliseconds. A value of 0, when
6014 * modifying the parameters, indicates that the current value should not
6018 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6019 char __user *optval,
6020 int __user *optlen) {
6021 struct sctp_rtoinfo rtoinfo;
6022 struct sctp_association *asoc;
6024 if (len < sizeof (struct sctp_rtoinfo))
6027 len = sizeof(struct sctp_rtoinfo);
6029 if (copy_from_user(&rtoinfo, optval, len))
6032 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6034 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
6037 /* Values corresponding to the specific association. */
6039 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6040 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6041 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6043 /* Values corresponding to the endpoint. */
6044 struct sctp_sock *sp = sctp_sk(sk);
6046 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6047 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6048 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6051 if (put_user(len, optlen))
6054 if (copy_to_user(optval, &rtoinfo, len))
6062 * 7.1.2 SCTP_ASSOCINFO
6064 * This option is used to tune the maximum retransmission attempts
6065 * of the association.
6066 * Returns an error if the new association retransmission value is
6067 * greater than the sum of the retransmission value of the peer.
6068 * See [SCTP] for more information.
6071 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6072 char __user *optval,
6076 struct sctp_assocparams assocparams;
6077 struct sctp_association *asoc;
6078 struct list_head *pos;
6081 if (len < sizeof (struct sctp_assocparams))
6084 len = sizeof(struct sctp_assocparams);
6086 if (copy_from_user(&assocparams, optval, len))
6089 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6091 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
6094 /* Values correspoinding to the specific association */
6096 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6097 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6098 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6099 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6101 list_for_each(pos, &asoc->peer.transport_addr_list) {
6105 assocparams.sasoc_number_peer_destinations = cnt;
6107 /* Values corresponding to the endpoint */
6108 struct sctp_sock *sp = sctp_sk(sk);
6110 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6111 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6112 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6113 assocparams.sasoc_cookie_life =
6114 sp->assocparams.sasoc_cookie_life;
6115 assocparams.sasoc_number_peer_destinations =
6117 sasoc_number_peer_destinations;
6120 if (put_user(len, optlen))
6123 if (copy_to_user(optval, &assocparams, len))
6130 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6132 * This socket option is a boolean flag which turns on or off mapped V4
6133 * addresses. If this option is turned on and the socket is type
6134 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6135 * If this option is turned off, then no mapping will be done of V4
6136 * addresses and a user will receive both PF_INET6 and PF_INET type
6137 * addresses on the socket.
6139 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6140 char __user *optval, int __user *optlen)
6143 struct sctp_sock *sp = sctp_sk(sk);
6145 if (len < sizeof(int))
6150 if (put_user(len, optlen))
6152 if (copy_to_user(optval, &val, len))
6159 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6160 * (chapter and verse is quoted at sctp_setsockopt_context())
6162 static int sctp_getsockopt_context(struct sock *sk, int len,
6163 char __user *optval, int __user *optlen)
6165 struct sctp_assoc_value params;
6166 struct sctp_sock *sp;
6167 struct sctp_association *asoc;
6169 if (len < sizeof(struct sctp_assoc_value))
6172 len = sizeof(struct sctp_assoc_value);
6174 if (copy_from_user(¶ms, optval, len))
6179 if (params.assoc_id != 0) {
6180 asoc = sctp_id2assoc(sk, params.assoc_id);
6183 params.assoc_value = asoc->default_rcv_context;
6185 params.assoc_value = sp->default_rcv_context;
6188 if (put_user(len, optlen))
6190 if (copy_to_user(optval, ¶ms, len))
6197 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6198 * This option will get or set the maximum size to put in any outgoing
6199 * SCTP DATA chunk. If a message is larger than this size it will be
6200 * fragmented by SCTP into the specified size. Note that the underlying
6201 * SCTP implementation may fragment into smaller sized chunks when the
6202 * PMTU of the underlying association is smaller than the value set by
6203 * the user. The default value for this option is '0' which indicates
6204 * the user is NOT limiting fragmentation and only the PMTU will effect
6205 * SCTP's choice of DATA chunk size. Note also that values set larger
6206 * than the maximum size of an IP datagram will effectively let SCTP
6207 * control fragmentation (i.e. the same as setting this option to 0).
6209 * The following structure is used to access and modify this parameter:
6211 * struct sctp_assoc_value {
6212 * sctp_assoc_t assoc_id;
6213 * uint32_t assoc_value;
6216 * assoc_id: This parameter is ignored for one-to-one style sockets.
6217 * For one-to-many style sockets this parameter indicates which
6218 * association the user is performing an action upon. Note that if
6219 * this field's value is zero then the endpoints default value is
6220 * changed (effecting future associations only).
6221 * assoc_value: This parameter specifies the maximum size in bytes.
6223 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6224 char __user *optval, int __user *optlen)
6226 struct sctp_assoc_value params;
6227 struct sctp_association *asoc;
6229 if (len == sizeof(int)) {
6230 pr_warn_ratelimited(DEPRECATED
6232 "Use of int in maxseg socket option.\n"
6233 "Use struct sctp_assoc_value instead\n",
6234 current->comm, task_pid_nr(current));
6235 params.assoc_id = 0;
6236 } else if (len >= sizeof(struct sctp_assoc_value)) {
6237 len = sizeof(struct sctp_assoc_value);
6238 if (copy_from_user(¶ms, optval, len))
6243 asoc = sctp_id2assoc(sk, params.assoc_id);
6244 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6248 params.assoc_value = asoc->frag_point;
6250 params.assoc_value = sctp_sk(sk)->user_frag;
6252 if (put_user(len, optlen))
6254 if (len == sizeof(int)) {
6255 if (copy_to_user(optval, ¶ms.assoc_value, len))
6258 if (copy_to_user(optval, ¶ms, len))
6266 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6267 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6269 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6270 char __user *optval, int __user *optlen)
6274 if (len < sizeof(int))
6279 val = sctp_sk(sk)->frag_interleave;
6280 if (put_user(len, optlen))
6282 if (copy_to_user(optval, &val, len))
6289 * 7.1.25. Set or Get the sctp partial delivery point
6290 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6292 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6293 char __user *optval,
6298 if (len < sizeof(u32))
6303 val = sctp_sk(sk)->pd_point;
6304 if (put_user(len, optlen))
6306 if (copy_to_user(optval, &val, len))
6313 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6314 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6316 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6317 char __user *optval,
6320 struct sctp_assoc_value params;
6321 struct sctp_sock *sp;
6322 struct sctp_association *asoc;
6324 if (len == sizeof(int)) {
6325 pr_warn_ratelimited(DEPRECATED
6327 "Use of int in max_burst socket option.\n"
6328 "Use struct sctp_assoc_value instead\n",
6329 current->comm, task_pid_nr(current));
6330 params.assoc_id = 0;
6331 } else if (len >= sizeof(struct sctp_assoc_value)) {
6332 len = sizeof(struct sctp_assoc_value);
6333 if (copy_from_user(¶ms, optval, len))
6340 if (params.assoc_id != 0) {
6341 asoc = sctp_id2assoc(sk, params.assoc_id);
6344 params.assoc_value = asoc->max_burst;
6346 params.assoc_value = sp->max_burst;
6348 if (len == sizeof(int)) {
6349 if (copy_to_user(optval, ¶ms.assoc_value, len))
6352 if (copy_to_user(optval, ¶ms, len))
6360 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6361 char __user *optval, int __user *optlen)
6363 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6364 struct sctp_hmacalgo __user *p = (void __user *)optval;
6365 struct sctp_hmac_algo_param *hmacs;
6370 if (!ep->auth_enable)
6373 hmacs = ep->auth_hmacs_list;
6374 data_len = ntohs(hmacs->param_hdr.length) -
6375 sizeof(struct sctp_paramhdr);
6377 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6380 len = sizeof(struct sctp_hmacalgo) + data_len;
6381 num_idents = data_len / sizeof(u16);
6383 if (put_user(len, optlen))
6385 if (put_user(num_idents, &p->shmac_num_idents))
6387 for (i = 0; i < num_idents; i++) {
6388 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6390 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6396 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6397 char __user *optval, int __user *optlen)
6399 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6400 struct sctp_authkeyid val;
6401 struct sctp_association *asoc;
6403 if (!ep->auth_enable)
6406 if (len < sizeof(struct sctp_authkeyid))
6409 len = sizeof(struct sctp_authkeyid);
6410 if (copy_from_user(&val, optval, len))
6413 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6414 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6418 val.scact_keynumber = asoc->active_key_id;
6420 val.scact_keynumber = ep->active_key_id;
6422 if (put_user(len, optlen))
6424 if (copy_to_user(optval, &val, len))
6430 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6431 char __user *optval, int __user *optlen)
6433 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6434 struct sctp_authchunks __user *p = (void __user *)optval;
6435 struct sctp_authchunks val;
6436 struct sctp_association *asoc;
6437 struct sctp_chunks_param *ch;
6441 if (!ep->auth_enable)
6444 if (len < sizeof(struct sctp_authchunks))
6447 if (copy_from_user(&val, optval, sizeof(val)))
6450 to = p->gauth_chunks;
6451 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6455 ch = asoc->peer.peer_chunks;
6459 /* See if the user provided enough room for all the data */
6460 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6461 if (len < num_chunks)
6464 if (copy_to_user(to, ch->chunks, num_chunks))
6467 len = sizeof(struct sctp_authchunks) + num_chunks;
6468 if (put_user(len, optlen))
6470 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6475 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6476 char __user *optval, int __user *optlen)
6478 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6479 struct sctp_authchunks __user *p = (void __user *)optval;
6480 struct sctp_authchunks val;
6481 struct sctp_association *asoc;
6482 struct sctp_chunks_param *ch;
6486 if (!ep->auth_enable)
6489 if (len < sizeof(struct sctp_authchunks))
6492 if (copy_from_user(&val, optval, sizeof(val)))
6495 to = p->gauth_chunks;
6496 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6497 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6501 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6503 ch = ep->auth_chunk_list;
6508 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6509 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6512 if (copy_to_user(to, ch->chunks, num_chunks))
6515 len = sizeof(struct sctp_authchunks) + num_chunks;
6516 if (put_user(len, optlen))
6518 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6525 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6526 * This option gets the current number of associations that are attached
6527 * to a one-to-many style socket. The option value is an uint32_t.
6529 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6530 char __user *optval, int __user *optlen)
6532 struct sctp_sock *sp = sctp_sk(sk);
6533 struct sctp_association *asoc;
6536 if (sctp_style(sk, TCP))
6539 if (len < sizeof(u32))
6544 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6548 if (put_user(len, optlen))
6550 if (copy_to_user(optval, &val, len))
6557 * 8.1.23 SCTP_AUTO_ASCONF
6558 * See the corresponding setsockopt entry as description
6560 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6561 char __user *optval, int __user *optlen)
6565 if (len < sizeof(int))
6569 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6571 if (put_user(len, optlen))
6573 if (copy_to_user(optval, &val, len))
6579 * 8.2.6. Get the Current Identifiers of Associations
6580 * (SCTP_GET_ASSOC_ID_LIST)
6582 * This option gets the current list of SCTP association identifiers of
6583 * the SCTP associations handled by a one-to-many style socket.
6585 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6586 char __user *optval, int __user *optlen)
6588 struct sctp_sock *sp = sctp_sk(sk);
6589 struct sctp_association *asoc;
6590 struct sctp_assoc_ids *ids;
6593 if (sctp_style(sk, TCP))
6596 if (len < sizeof(struct sctp_assoc_ids))
6599 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6603 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6606 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6608 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6612 ids->gaids_number_of_ids = num;
6614 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6615 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6618 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6628 * SCTP_PEER_ADDR_THLDS
6630 * This option allows us to fetch the partially failed threshold for one or all
6631 * transports in an association. See Section 6.1 of:
6632 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6634 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6635 char __user *optval,
6639 struct sctp_paddrthlds val;
6640 struct sctp_transport *trans;
6641 struct sctp_association *asoc;
6643 if (len < sizeof(struct sctp_paddrthlds))
6645 len = sizeof(struct sctp_paddrthlds);
6646 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6649 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6650 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6654 val.spt_pathpfthld = asoc->pf_retrans;
6655 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6657 trans = sctp_addr_id2transport(sk, &val.spt_address,
6662 val.spt_pathmaxrxt = trans->pathmaxrxt;
6663 val.spt_pathpfthld = trans->pf_retrans;
6666 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6673 * SCTP_GET_ASSOC_STATS
6675 * This option retrieves local per endpoint statistics. It is modeled
6676 * after OpenSolaris' implementation
6678 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6679 char __user *optval,
6682 struct sctp_assoc_stats sas;
6683 struct sctp_association *asoc = NULL;
6685 /* User must provide at least the assoc id */
6686 if (len < sizeof(sctp_assoc_t))
6689 /* Allow the struct to grow and fill in as much as possible */
6690 len = min_t(size_t, len, sizeof(sas));
6692 if (copy_from_user(&sas, optval, len))
6695 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6699 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6700 sas.sas_gapcnt = asoc->stats.gapcnt;
6701 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6702 sas.sas_osacks = asoc->stats.osacks;
6703 sas.sas_isacks = asoc->stats.isacks;
6704 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6705 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6706 sas.sas_oodchunks = asoc->stats.oodchunks;
6707 sas.sas_iodchunks = asoc->stats.iodchunks;
6708 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6709 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6710 sas.sas_idupchunks = asoc->stats.idupchunks;
6711 sas.sas_opackets = asoc->stats.opackets;
6712 sas.sas_ipackets = asoc->stats.ipackets;
6714 /* New high max rto observed, will return 0 if not a single
6715 * RTO update took place. obs_rto_ipaddr will be bogus
6718 sas.sas_maxrto = asoc->stats.max_obs_rto;
6719 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6720 sizeof(struct sockaddr_storage));
6722 /* Mark beginning of a new observation period */
6723 asoc->stats.max_obs_rto = asoc->rto_min;
6725 if (put_user(len, optlen))
6728 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6730 if (copy_to_user(optval, &sas, len))
6736 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6737 char __user *optval,
6742 if (len < sizeof(int))
6746 if (sctp_sk(sk)->recvrcvinfo)
6748 if (put_user(len, optlen))
6750 if (copy_to_user(optval, &val, len))
6756 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6757 char __user *optval,
6762 if (len < sizeof(int))
6766 if (sctp_sk(sk)->recvnxtinfo)
6768 if (put_user(len, optlen))
6770 if (copy_to_user(optval, &val, len))
6776 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6777 char __user *optval,
6780 struct sctp_assoc_value params;
6781 struct sctp_association *asoc;
6782 int retval = -EFAULT;
6784 if (len < sizeof(params)) {
6789 len = sizeof(params);
6790 if (copy_from_user(¶ms, optval, len))
6793 asoc = sctp_id2assoc(sk, params.assoc_id);
6795 params.assoc_value = asoc->prsctp_enable;
6796 } else if (!params.assoc_id) {
6797 struct sctp_sock *sp = sctp_sk(sk);
6799 params.assoc_value = sp->ep->prsctp_enable;
6805 if (put_user(len, optlen))
6808 if (copy_to_user(optval, ¶ms, len))
6817 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6818 char __user *optval,
6821 struct sctp_default_prinfo info;
6822 struct sctp_association *asoc;
6823 int retval = -EFAULT;
6825 if (len < sizeof(info)) {
6831 if (copy_from_user(&info, optval, len))
6834 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6836 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6837 info.pr_value = asoc->default_timetolive;
6838 } else if (!info.pr_assoc_id) {
6839 struct sctp_sock *sp = sctp_sk(sk);
6841 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6842 info.pr_value = sp->default_timetolive;
6848 if (put_user(len, optlen))
6851 if (copy_to_user(optval, &info, len))
6860 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6861 char __user *optval,
6864 struct sctp_prstatus params;
6865 struct sctp_association *asoc;
6867 int retval = -EINVAL;
6869 if (len < sizeof(params))
6872 len = sizeof(params);
6873 if (copy_from_user(¶ms, optval, len)) {
6878 policy = params.sprstat_policy;
6879 if (policy & ~SCTP_PR_SCTP_MASK)
6882 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6886 if (policy == SCTP_PR_SCTP_NONE) {
6887 params.sprstat_abandoned_unsent = 0;
6888 params.sprstat_abandoned_sent = 0;
6889 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6890 params.sprstat_abandoned_unsent +=
6891 asoc->abandoned_unsent[policy];
6892 params.sprstat_abandoned_sent +=
6893 asoc->abandoned_sent[policy];
6896 params.sprstat_abandoned_unsent =
6897 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6898 params.sprstat_abandoned_sent =
6899 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6902 if (put_user(len, optlen)) {
6907 if (copy_to_user(optval, ¶ms, len)) {
6918 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
6919 char __user *optval,
6922 struct sctp_stream_out_ext *streamoute;
6923 struct sctp_association *asoc;
6924 struct sctp_prstatus params;
6925 int retval = -EINVAL;
6928 if (len < sizeof(params))
6931 len = sizeof(params);
6932 if (copy_from_user(¶ms, optval, len)) {
6937 policy = params.sprstat_policy;
6938 if (policy & ~SCTP_PR_SCTP_MASK)
6941 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6942 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6945 streamoute = asoc->stream.out[params.sprstat_sid].ext;
6947 /* Not allocated yet, means all stats are 0 */
6948 params.sprstat_abandoned_unsent = 0;
6949 params.sprstat_abandoned_sent = 0;
6954 if (policy == SCTP_PR_SCTP_NONE) {
6955 params.sprstat_abandoned_unsent = 0;
6956 params.sprstat_abandoned_sent = 0;
6957 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6958 params.sprstat_abandoned_unsent +=
6959 streamoute->abandoned_unsent[policy];
6960 params.sprstat_abandoned_sent +=
6961 streamoute->abandoned_sent[policy];
6964 params.sprstat_abandoned_unsent =
6965 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6966 params.sprstat_abandoned_sent =
6967 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
6970 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
6981 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
6982 char __user *optval,
6985 struct sctp_assoc_value params;
6986 struct sctp_association *asoc;
6987 int retval = -EFAULT;
6989 if (len < sizeof(params)) {
6994 len = sizeof(params);
6995 if (copy_from_user(¶ms, optval, len))
6998 asoc = sctp_id2assoc(sk, params.assoc_id);
7000 params.assoc_value = asoc->reconf_enable;
7001 } else if (!params.assoc_id) {
7002 struct sctp_sock *sp = sctp_sk(sk);
7004 params.assoc_value = sp->ep->reconf_enable;
7010 if (put_user(len, optlen))
7013 if (copy_to_user(optval, ¶ms, len))
7022 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7023 char __user *optval,
7026 struct sctp_assoc_value params;
7027 struct sctp_association *asoc;
7028 int retval = -EFAULT;
7030 if (len < sizeof(params)) {
7035 len = sizeof(params);
7036 if (copy_from_user(¶ms, optval, len))
7039 asoc = sctp_id2assoc(sk, params.assoc_id);
7041 params.assoc_value = asoc->strreset_enable;
7042 } else if (!params.assoc_id) {
7043 struct sctp_sock *sp = sctp_sk(sk);
7045 params.assoc_value = sp->ep->strreset_enable;
7051 if (put_user(len, optlen))
7054 if (copy_to_user(optval, ¶ms, len))
7063 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7064 char __user *optval,
7067 struct sctp_assoc_value params;
7068 struct sctp_association *asoc;
7069 int retval = -EFAULT;
7071 if (len < sizeof(params)) {
7076 len = sizeof(params);
7077 if (copy_from_user(¶ms, optval, len))
7080 asoc = sctp_id2assoc(sk, params.assoc_id);
7086 params.assoc_value = sctp_sched_get_sched(asoc);
7088 if (put_user(len, optlen))
7091 if (copy_to_user(optval, ¶ms, len))
7100 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7101 char __user *optval,
7104 struct sctp_stream_value params;
7105 struct sctp_association *asoc;
7106 int retval = -EFAULT;
7108 if (len < sizeof(params)) {
7113 len = sizeof(params);
7114 if (copy_from_user(¶ms, optval, len))
7117 asoc = sctp_id2assoc(sk, params.assoc_id);
7123 retval = sctp_sched_get_value(asoc, params.stream_id,
7124 ¶ms.stream_value);
7128 if (put_user(len, optlen)) {
7133 if (copy_to_user(optval, ¶ms, len)) {
7142 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7143 char __user *optval,
7146 struct sctp_assoc_value params;
7147 struct sctp_association *asoc;
7148 int retval = -EFAULT;
7150 if (len < sizeof(params)) {
7155 len = sizeof(params);
7156 if (copy_from_user(¶ms, optval, len))
7159 asoc = sctp_id2assoc(sk, params.assoc_id);
7161 params.assoc_value = asoc->intl_enable;
7162 } else if (!params.assoc_id) {
7163 struct sctp_sock *sp = sctp_sk(sk);
7165 params.assoc_value = sp->strm_interleave;
7171 if (put_user(len, optlen))
7174 if (copy_to_user(optval, ¶ms, len))
7183 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7184 char __user *optval, int __user *optlen)
7189 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7191 /* I can hardly begin to describe how wrong this is. This is
7192 * so broken as to be worse than useless. The API draft
7193 * REALLY is NOT helpful here... I am not convinced that the
7194 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7195 * are at all well-founded.
7197 if (level != SOL_SCTP) {
7198 struct sctp_af *af = sctp_sk(sk)->pf->af;
7200 retval = af->getsockopt(sk, level, optname, optval, optlen);
7204 if (get_user(len, optlen))
7214 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7216 case SCTP_DISABLE_FRAGMENTS:
7217 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7221 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7223 case SCTP_AUTOCLOSE:
7224 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7226 case SCTP_SOCKOPT_PEELOFF:
7227 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7229 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7230 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7232 case SCTP_PEER_ADDR_PARAMS:
7233 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7236 case SCTP_DELAYED_SACK:
7237 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7241 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7243 case SCTP_GET_PEER_ADDRS:
7244 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7247 case SCTP_GET_LOCAL_ADDRS:
7248 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7251 case SCTP_SOCKOPT_CONNECTX3:
7252 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7254 case SCTP_DEFAULT_SEND_PARAM:
7255 retval = sctp_getsockopt_default_send_param(sk, len,
7258 case SCTP_DEFAULT_SNDINFO:
7259 retval = sctp_getsockopt_default_sndinfo(sk, len,
7262 case SCTP_PRIMARY_ADDR:
7263 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7266 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7269 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7271 case SCTP_ASSOCINFO:
7272 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7274 case SCTP_I_WANT_MAPPED_V4_ADDR:
7275 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7278 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7280 case SCTP_GET_PEER_ADDR_INFO:
7281 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7284 case SCTP_ADAPTATION_LAYER:
7285 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7289 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7291 case SCTP_FRAGMENT_INTERLEAVE:
7292 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7295 case SCTP_PARTIAL_DELIVERY_POINT:
7296 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7299 case SCTP_MAX_BURST:
7300 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7303 case SCTP_AUTH_CHUNK:
7304 case SCTP_AUTH_DELETE_KEY:
7305 case SCTP_AUTH_DEACTIVATE_KEY:
7306 retval = -EOPNOTSUPP;
7308 case SCTP_HMAC_IDENT:
7309 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7311 case SCTP_AUTH_ACTIVE_KEY:
7312 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7314 case SCTP_PEER_AUTH_CHUNKS:
7315 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7318 case SCTP_LOCAL_AUTH_CHUNKS:
7319 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7322 case SCTP_GET_ASSOC_NUMBER:
7323 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7325 case SCTP_GET_ASSOC_ID_LIST:
7326 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7328 case SCTP_AUTO_ASCONF:
7329 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7331 case SCTP_PEER_ADDR_THLDS:
7332 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7334 case SCTP_GET_ASSOC_STATS:
7335 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7337 case SCTP_RECVRCVINFO:
7338 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7340 case SCTP_RECVNXTINFO:
7341 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7343 case SCTP_PR_SUPPORTED:
7344 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7346 case SCTP_DEFAULT_PRINFO:
7347 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7350 case SCTP_PR_ASSOC_STATUS:
7351 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7354 case SCTP_PR_STREAM_STATUS:
7355 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7358 case SCTP_RECONFIG_SUPPORTED:
7359 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7362 case SCTP_ENABLE_STREAM_RESET:
7363 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7366 case SCTP_STREAM_SCHEDULER:
7367 retval = sctp_getsockopt_scheduler(sk, len, optval,
7370 case SCTP_STREAM_SCHEDULER_VALUE:
7371 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7374 case SCTP_INTERLEAVING_SUPPORTED:
7375 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7379 retval = -ENOPROTOOPT;
7387 static int sctp_hash(struct sock *sk)
7393 static void sctp_unhash(struct sock *sk)
7398 /* Check if port is acceptable. Possibly find first available port.
7400 * The port hash table (contained in the 'global' SCTP protocol storage
7401 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7402 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7403 * list (the list number is the port number hashed out, so as you
7404 * would expect from a hash function, all the ports in a given list have
7405 * such a number that hashes out to the same list number; you were
7406 * expecting that, right?); so each list has a set of ports, with a
7407 * link to the socket (struct sock) that uses it, the port number and
7408 * a fastreuse flag (FIXME: NPI ipg).
7410 static struct sctp_bind_bucket *sctp_bucket_create(
7411 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7413 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7415 struct sctp_bind_hashbucket *head; /* hash list */
7416 struct sctp_bind_bucket *pp;
7417 unsigned short snum;
7420 snum = ntohs(addr->v4.sin_port);
7422 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7427 /* Search for an available port. */
7428 int low, high, remaining, index;
7430 struct net *net = sock_net(sk);
7432 inet_get_local_port_range(net, &low, &high);
7433 remaining = (high - low) + 1;
7434 rover = prandom_u32() % remaining + low;
7438 if ((rover < low) || (rover > high))
7440 if (inet_is_local_reserved_port(net, rover))
7442 index = sctp_phashfn(sock_net(sk), rover);
7443 head = &sctp_port_hashtable[index];
7444 spin_lock(&head->lock);
7445 sctp_for_each_hentry(pp, &head->chain)
7446 if ((pp->port == rover) &&
7447 net_eq(sock_net(sk), pp->net))
7451 spin_unlock(&head->lock);
7452 } while (--remaining > 0);
7454 /* Exhausted local port range during search? */
7459 /* OK, here is the one we will use. HEAD (the port
7460 * hash table list entry) is non-NULL and we hold it's
7465 /* We are given an specific port number; we verify
7466 * that it is not being used. If it is used, we will
7467 * exahust the search in the hash list corresponding
7468 * to the port number (snum) - we detect that with the
7469 * port iterator, pp being NULL.
7471 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7472 spin_lock(&head->lock);
7473 sctp_for_each_hentry(pp, &head->chain) {
7474 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7481 if (!hlist_empty(&pp->owner)) {
7482 /* We had a port hash table hit - there is an
7483 * available port (pp != NULL) and it is being
7484 * used by other socket (pp->owner not empty); that other
7485 * socket is going to be sk2.
7487 int reuse = sk->sk_reuse;
7490 pr_debug("%s: found a possible match\n", __func__);
7492 if (pp->fastreuse && sk->sk_reuse &&
7493 sk->sk_state != SCTP_SS_LISTENING)
7496 /* Run through the list of sockets bound to the port
7497 * (pp->port) [via the pointers bind_next and
7498 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7499 * we get the endpoint they describe and run through
7500 * the endpoint's list of IP (v4 or v6) addresses,
7501 * comparing each of the addresses with the address of
7502 * the socket sk. If we find a match, then that means
7503 * that this port/socket (sk) combination are already
7506 sk_for_each_bound(sk2, &pp->owner) {
7507 struct sctp_endpoint *ep2;
7508 ep2 = sctp_sk(sk2)->ep;
7511 (reuse && sk2->sk_reuse &&
7512 sk2->sk_state != SCTP_SS_LISTENING))
7515 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7516 sctp_sk(sk2), sctp_sk(sk))) {
7522 pr_debug("%s: found a match\n", __func__);
7525 /* If there was a hash table miss, create a new port. */
7527 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7530 /* In either case (hit or miss), make sure fastreuse is 1 only
7531 * if sk->sk_reuse is too (that is, if the caller requested
7532 * SO_REUSEADDR on this socket -sk-).
7534 if (hlist_empty(&pp->owner)) {
7535 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
7539 } else if (pp->fastreuse &&
7540 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
7543 /* We are set, so fill up all the data in the hash table
7544 * entry, tie the socket list information with the rest of the
7545 * sockets FIXME: Blurry, NPI (ipg).
7548 if (!sctp_sk(sk)->bind_hash) {
7549 inet_sk(sk)->inet_num = snum;
7550 sk_add_bind_node(sk, &pp->owner);
7551 sctp_sk(sk)->bind_hash = pp;
7556 spin_unlock(&head->lock);
7563 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7564 * port is requested.
7566 static int sctp_get_port(struct sock *sk, unsigned short snum)
7568 union sctp_addr addr;
7569 struct sctp_af *af = sctp_sk(sk)->pf->af;
7571 /* Set up a dummy address struct from the sk. */
7572 af->from_sk(&addr, sk);
7573 addr.v4.sin_port = htons(snum);
7575 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7576 return !!sctp_get_port_local(sk, &addr);
7580 * Move a socket to LISTENING state.
7582 static int sctp_listen_start(struct sock *sk, int backlog)
7584 struct sctp_sock *sp = sctp_sk(sk);
7585 struct sctp_endpoint *ep = sp->ep;
7586 struct crypto_shash *tfm = NULL;
7589 /* Allocate HMAC for generating cookie. */
7590 if (!sp->hmac && sp->sctp_hmac_alg) {
7591 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7592 tfm = crypto_alloc_shash(alg, 0, 0);
7594 net_info_ratelimited("failed to load transform for %s: %ld\n",
7595 sp->sctp_hmac_alg, PTR_ERR(tfm));
7598 sctp_sk(sk)->hmac = tfm;
7602 * If a bind() or sctp_bindx() is not called prior to a listen()
7603 * call that allows new associations to be accepted, the system
7604 * picks an ephemeral port and will choose an address set equivalent
7605 * to binding with a wildcard address.
7607 * This is not currently spelled out in the SCTP sockets
7608 * extensions draft, but follows the practice as seen in TCP
7612 inet_sk_set_state(sk, SCTP_SS_LISTENING);
7613 if (!ep->base.bind_addr.port) {
7614 if (sctp_autobind(sk))
7617 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7618 inet_sk_set_state(sk, SCTP_SS_CLOSED);
7623 sk->sk_max_ack_backlog = backlog;
7624 sctp_hash_endpoint(ep);
7629 * 4.1.3 / 5.1.3 listen()
7631 * By default, new associations are not accepted for UDP style sockets.
7632 * An application uses listen() to mark a socket as being able to
7633 * accept new associations.
7635 * On TCP style sockets, applications use listen() to ready the SCTP
7636 * endpoint for accepting inbound associations.
7638 * On both types of endpoints a backlog of '0' disables listening.
7640 * Move a socket to LISTENING state.
7642 int sctp_inet_listen(struct socket *sock, int backlog)
7644 struct sock *sk = sock->sk;
7645 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7648 if (unlikely(backlog < 0))
7653 /* Peeled-off sockets are not allowed to listen(). */
7654 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7657 if (sock->state != SS_UNCONNECTED)
7660 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7663 /* If backlog is zero, disable listening. */
7665 if (sctp_sstate(sk, CLOSED))
7669 sctp_unhash_endpoint(ep);
7670 sk->sk_state = SCTP_SS_CLOSED;
7672 sctp_sk(sk)->bind_hash->fastreuse = 1;
7676 /* If we are already listening, just update the backlog */
7677 if (sctp_sstate(sk, LISTENING))
7678 sk->sk_max_ack_backlog = backlog;
7680 err = sctp_listen_start(sk, backlog);
7692 * This function is done by modeling the current datagram_poll() and the
7693 * tcp_poll(). Note that, based on these implementations, we don't
7694 * lock the socket in this function, even though it seems that,
7695 * ideally, locking or some other mechanisms can be used to ensure
7696 * the integrity of the counters (sndbuf and wmem_alloc) used
7697 * in this place. We assume that we don't need locks either until proven
7700 * Another thing to note is that we include the Async I/O support
7701 * here, again, by modeling the current TCP/UDP code. We don't have
7702 * a good way to test with it yet.
7704 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7706 struct sock *sk = sock->sk;
7707 struct sctp_sock *sp = sctp_sk(sk);
7710 poll_wait(file, sk_sleep(sk), wait);
7712 sock_rps_record_flow(sk);
7714 /* A TCP-style listening socket becomes readable when the accept queue
7717 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7718 return (!list_empty(&sp->ep->asocs)) ?
7719 (EPOLLIN | EPOLLRDNORM) : 0;
7723 /* Is there any exceptional events? */
7724 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7726 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
7727 if (sk->sk_shutdown & RCV_SHUTDOWN)
7728 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
7729 if (sk->sk_shutdown == SHUTDOWN_MASK)
7732 /* Is it readable? Reconsider this code with TCP-style support. */
7733 if (!skb_queue_empty(&sk->sk_receive_queue))
7734 mask |= EPOLLIN | EPOLLRDNORM;
7736 /* The association is either gone or not ready. */
7737 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7740 /* Is it writable? */
7741 if (sctp_writeable(sk)) {
7742 mask |= EPOLLOUT | EPOLLWRNORM;
7744 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7746 * Since the socket is not locked, the buffer
7747 * might be made available after the writeable check and
7748 * before the bit is set. This could cause a lost I/O
7749 * signal. tcp_poll() has a race breaker for this race
7750 * condition. Based on their implementation, we put
7751 * in the following code to cover it as well.
7753 if (sctp_writeable(sk))
7754 mask |= EPOLLOUT | EPOLLWRNORM;
7759 /********************************************************************
7760 * 2nd Level Abstractions
7761 ********************************************************************/
7763 static struct sctp_bind_bucket *sctp_bucket_create(
7764 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
7766 struct sctp_bind_bucket *pp;
7768 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
7770 SCTP_DBG_OBJCNT_INC(bind_bucket);
7773 INIT_HLIST_HEAD(&pp->owner);
7775 hlist_add_head(&pp->node, &head->chain);
7780 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7781 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7783 if (pp && hlist_empty(&pp->owner)) {
7784 __hlist_del(&pp->node);
7785 kmem_cache_free(sctp_bucket_cachep, pp);
7786 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7790 /* Release this socket's reference to a local port. */
7791 static inline void __sctp_put_port(struct sock *sk)
7793 struct sctp_bind_hashbucket *head =
7794 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7795 inet_sk(sk)->inet_num)];
7796 struct sctp_bind_bucket *pp;
7798 spin_lock(&head->lock);
7799 pp = sctp_sk(sk)->bind_hash;
7800 __sk_del_bind_node(sk);
7801 sctp_sk(sk)->bind_hash = NULL;
7802 inet_sk(sk)->inet_num = 0;
7803 sctp_bucket_destroy(pp);
7804 spin_unlock(&head->lock);
7807 void sctp_put_port(struct sock *sk)
7810 __sctp_put_port(sk);
7815 * The system picks an ephemeral port and choose an address set equivalent
7816 * to binding with a wildcard address.
7817 * One of those addresses will be the primary address for the association.
7818 * This automatically enables the multihoming capability of SCTP.
7820 static int sctp_autobind(struct sock *sk)
7822 union sctp_addr autoaddr;
7826 /* Initialize a local sockaddr structure to INADDR_ANY. */
7827 af = sctp_sk(sk)->pf->af;
7829 port = htons(inet_sk(sk)->inet_num);
7830 af->inaddr_any(&autoaddr, port);
7832 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7835 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7838 * 4.2 The cmsghdr Structure *
7840 * When ancillary data is sent or received, any number of ancillary data
7841 * objects can be specified by the msg_control and msg_controllen members of
7842 * the msghdr structure, because each object is preceded by
7843 * a cmsghdr structure defining the object's length (the cmsg_len member).
7844 * Historically Berkeley-derived implementations have passed only one object
7845 * at a time, but this API allows multiple objects to be
7846 * passed in a single call to sendmsg() or recvmsg(). The following example
7847 * shows two ancillary data objects in a control buffer.
7849 * |<--------------------------- msg_controllen -------------------------->|
7852 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7854 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7857 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7859 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7862 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7863 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7865 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7867 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7874 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
7876 struct msghdr *my_msg = (struct msghdr *)msg;
7877 struct cmsghdr *cmsg;
7879 for_each_cmsghdr(cmsg, my_msg) {
7880 if (!CMSG_OK(my_msg, cmsg))
7883 /* Should we parse this header or ignore? */
7884 if (cmsg->cmsg_level != IPPROTO_SCTP)
7887 /* Strictly check lengths following example in SCM code. */
7888 switch (cmsg->cmsg_type) {
7890 /* SCTP Socket API Extension
7891 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7893 * This cmsghdr structure provides information for
7894 * initializing new SCTP associations with sendmsg().
7895 * The SCTP_INITMSG socket option uses this same data
7896 * structure. This structure is not used for
7899 * cmsg_level cmsg_type cmsg_data[]
7900 * ------------ ------------ ----------------------
7901 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7903 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
7906 cmsgs->init = CMSG_DATA(cmsg);
7910 /* SCTP Socket API Extension
7911 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7913 * This cmsghdr structure specifies SCTP options for
7914 * sendmsg() and describes SCTP header information
7915 * about a received message through recvmsg().
7917 * cmsg_level cmsg_type cmsg_data[]
7918 * ------------ ------------ ----------------------
7919 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7921 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
7924 cmsgs->srinfo = CMSG_DATA(cmsg);
7926 if (cmsgs->srinfo->sinfo_flags &
7927 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7928 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
7929 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
7934 /* SCTP Socket API Extension
7935 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7937 * This cmsghdr structure specifies SCTP options for
7938 * sendmsg(). This structure and SCTP_RCVINFO replaces
7939 * SCTP_SNDRCV which has been deprecated.
7941 * cmsg_level cmsg_type cmsg_data[]
7942 * ------------ ------------ ---------------------
7943 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7945 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7948 cmsgs->sinfo = CMSG_DATA(cmsg);
7950 if (cmsgs->sinfo->snd_flags &
7951 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7952 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
7953 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
7957 /* SCTP Socket API Extension
7958 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
7960 * This cmsghdr structure specifies SCTP options for sendmsg().
7962 * cmsg_level cmsg_type cmsg_data[]
7963 * ------------ ------------ ---------------------
7964 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
7966 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
7969 cmsgs->prinfo = CMSG_DATA(cmsg);
7970 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
7973 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
7974 cmsgs->prinfo->pr_value = 0;
7977 /* SCTP Socket API Extension
7978 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
7980 * This cmsghdr structure specifies SCTP options for sendmsg().
7982 * cmsg_level cmsg_type cmsg_data[]
7983 * ------------ ------------ ---------------------
7984 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
7986 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
7989 cmsgs->authinfo = CMSG_DATA(cmsg);
7991 case SCTP_DSTADDRV4:
7992 case SCTP_DSTADDRV6:
7993 /* SCTP Socket API Extension
7994 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
7996 * This cmsghdr structure specifies SCTP options for sendmsg().
7998 * cmsg_level cmsg_type cmsg_data[]
7999 * ------------ ------------ ---------------------
8000 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8001 * ------------ ------------ ---------------------
8002 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8004 cmsgs->addrs_msg = my_msg;
8015 * Wait for a packet..
8016 * Note: This function is the same function as in core/datagram.c
8017 * with a few modifications to make lksctp work.
8019 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8024 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8026 /* Socket errors? */
8027 error = sock_error(sk);
8031 if (!skb_queue_empty(&sk->sk_receive_queue))
8034 /* Socket shut down? */
8035 if (sk->sk_shutdown & RCV_SHUTDOWN)
8038 /* Sequenced packets can come disconnected. If so we report the
8043 /* Is there a good reason to think that we may receive some data? */
8044 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8047 /* Handle signals. */
8048 if (signal_pending(current))
8051 /* Let another process have a go. Since we are going to sleep
8052 * anyway. Note: This may cause odd behaviors if the message
8053 * does not fit in the user's buffer, but this seems to be the
8054 * only way to honor MSG_DONTWAIT realistically.
8057 *timeo_p = schedule_timeout(*timeo_p);
8061 finish_wait(sk_sleep(sk), &wait);
8065 error = sock_intr_errno(*timeo_p);
8068 finish_wait(sk_sleep(sk), &wait);
8073 /* Receive a datagram.
8074 * Note: This is pretty much the same routine as in core/datagram.c
8075 * with a few changes to make lksctp work.
8077 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8078 int noblock, int *err)
8081 struct sk_buff *skb;
8084 timeo = sock_rcvtimeo(sk, noblock);
8086 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8087 MAX_SCHEDULE_TIMEOUT);
8090 /* Again only user level code calls this function,
8091 * so nothing interrupt level
8092 * will suddenly eat the receive_queue.
8094 * Look at current nfs client by the way...
8095 * However, this function was correct in any case. 8)
8097 if (flags & MSG_PEEK) {
8098 skb = skb_peek(&sk->sk_receive_queue);
8100 refcount_inc(&skb->users);
8102 skb = __skb_dequeue(&sk->sk_receive_queue);
8108 /* Caller is allowed not to check sk->sk_err before calling. */
8109 error = sock_error(sk);
8113 if (sk->sk_shutdown & RCV_SHUTDOWN)
8116 if (sk_can_busy_loop(sk)) {
8117 sk_busy_loop(sk, noblock);
8119 if (!skb_queue_empty(&sk->sk_receive_queue))
8123 /* User doesn't want to wait. */
8127 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8136 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8137 static void __sctp_write_space(struct sctp_association *asoc)
8139 struct sock *sk = asoc->base.sk;
8141 if (sctp_wspace(asoc) <= 0)
8144 if (waitqueue_active(&asoc->wait))
8145 wake_up_interruptible(&asoc->wait);
8147 if (sctp_writeable(sk)) {
8148 struct socket_wq *wq;
8151 wq = rcu_dereference(sk->sk_wq);
8153 if (waitqueue_active(&wq->wait))
8154 wake_up_interruptible(&wq->wait);
8156 /* Note that we try to include the Async I/O support
8157 * here by modeling from the current TCP/UDP code.
8158 * We have not tested with it yet.
8160 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8161 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8167 static void sctp_wake_up_waiters(struct sock *sk,
8168 struct sctp_association *asoc)
8170 struct sctp_association *tmp = asoc;
8172 /* We do accounting for the sndbuf space per association,
8173 * so we only need to wake our own association.
8175 if (asoc->ep->sndbuf_policy)
8176 return __sctp_write_space(asoc);
8178 /* If association goes down and is just flushing its
8179 * outq, then just normally notify others.
8181 if (asoc->base.dead)
8182 return sctp_write_space(sk);
8184 /* Accounting for the sndbuf space is per socket, so we
8185 * need to wake up others, try to be fair and in case of
8186 * other associations, let them have a go first instead
8187 * of just doing a sctp_write_space() call.
8189 * Note that we reach sctp_wake_up_waiters() only when
8190 * associations free up queued chunks, thus we are under
8191 * lock and the list of associations on a socket is
8192 * guaranteed not to change.
8194 for (tmp = list_next_entry(tmp, asocs); 1;
8195 tmp = list_next_entry(tmp, asocs)) {
8196 /* Manually skip the head element. */
8197 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8199 /* Wake up association. */
8200 __sctp_write_space(tmp);
8201 /* We've reached the end. */
8207 /* Do accounting for the sndbuf space.
8208 * Decrement the used sndbuf space of the corresponding association by the
8209 * data size which was just transmitted(freed).
8211 static void sctp_wfree(struct sk_buff *skb)
8213 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8214 struct sctp_association *asoc = chunk->asoc;
8215 struct sock *sk = asoc->base.sk;
8217 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
8218 sizeof(struct sk_buff) +
8219 sizeof(struct sctp_chunk);
8221 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
8224 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
8226 sk->sk_wmem_queued -= skb->truesize;
8227 sk_mem_uncharge(sk, skb->truesize);
8230 struct sctp_shared_key *shkey = chunk->shkey;
8232 /* refcnt == 2 and !list_empty mean after this release, it's
8233 * not being used anywhere, and it's time to notify userland
8234 * that this shkey can be freed if it's been deactivated.
8236 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8237 refcount_read(&shkey->refcnt) == 2) {
8238 struct sctp_ulpevent *ev;
8240 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8244 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8246 sctp_auth_shkey_release(chunk->shkey);
8250 sctp_wake_up_waiters(sk, asoc);
8252 sctp_association_put(asoc);
8255 /* Do accounting for the receive space on the socket.
8256 * Accounting for the association is done in ulpevent.c
8257 * We set this as a destructor for the cloned data skbs so that
8258 * accounting is done at the correct time.
8260 void sctp_sock_rfree(struct sk_buff *skb)
8262 struct sock *sk = skb->sk;
8263 struct sctp_ulpevent *event = sctp_skb2event(skb);
8265 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8268 * Mimic the behavior of sock_rfree
8270 sk_mem_uncharge(sk, event->rmem_len);
8274 /* Helper function to wait for space in the sndbuf. */
8275 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8278 struct sock *sk = asoc->base.sk;
8279 long current_timeo = *timeo_p;
8283 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8286 /* Increment the association's refcnt. */
8287 sctp_association_hold(asoc);
8289 /* Wait on the association specific sndbuf space. */
8291 prepare_to_wait_exclusive(&asoc->wait, &wait,
8292 TASK_INTERRUPTIBLE);
8293 if (asoc->base.dead)
8297 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8299 if (signal_pending(current))
8300 goto do_interrupted;
8301 if (msg_len <= sctp_wspace(asoc))
8304 /* Let another process have a go. Since we are going
8308 current_timeo = schedule_timeout(current_timeo);
8310 if (sk != asoc->base.sk)
8313 *timeo_p = current_timeo;
8317 finish_wait(&asoc->wait, &wait);
8319 /* Release the association's refcnt. */
8320 sctp_association_put(asoc);
8333 err = sock_intr_errno(*timeo_p);
8341 void sctp_data_ready(struct sock *sk)
8343 struct socket_wq *wq;
8346 wq = rcu_dereference(sk->sk_wq);
8347 if (skwq_has_sleeper(wq))
8348 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8349 EPOLLRDNORM | EPOLLRDBAND);
8350 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8354 /* If socket sndbuf has changed, wake up all per association waiters. */
8355 void sctp_write_space(struct sock *sk)
8357 struct sctp_association *asoc;
8359 /* Wake up the tasks in each wait queue. */
8360 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
8361 __sctp_write_space(asoc);
8365 /* Is there any sndbuf space available on the socket?
8367 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
8368 * associations on the same socket. For a UDP-style socket with
8369 * multiple associations, it is possible for it to be "unwriteable"
8370 * prematurely. I assume that this is acceptable because
8371 * a premature "unwriteable" is better than an accidental "writeable" which
8372 * would cause an unwanted block under certain circumstances. For the 1-1
8373 * UDP-style sockets or TCP-style sockets, this code should work.
8376 static int sctp_writeable(struct sock *sk)
8380 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
8386 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
8387 * returns immediately with EINPROGRESS.
8389 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
8391 struct sock *sk = asoc->base.sk;
8393 long current_timeo = *timeo_p;
8396 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
8398 /* Increment the association's refcnt. */
8399 sctp_association_hold(asoc);
8402 prepare_to_wait_exclusive(&asoc->wait, &wait,
8403 TASK_INTERRUPTIBLE);
8406 if (sk->sk_shutdown & RCV_SHUTDOWN)
8408 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
8411 if (signal_pending(current))
8412 goto do_interrupted;
8414 if (sctp_state(asoc, ESTABLISHED))
8417 /* Let another process have a go. Since we are going
8421 current_timeo = schedule_timeout(current_timeo);
8424 *timeo_p = current_timeo;
8428 finish_wait(&asoc->wait, &wait);
8430 /* Release the association's refcnt. */
8431 sctp_association_put(asoc);
8436 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
8439 err = -ECONNREFUSED;
8443 err = sock_intr_errno(*timeo_p);
8451 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8453 struct sctp_endpoint *ep;
8457 ep = sctp_sk(sk)->ep;
8461 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8462 TASK_INTERRUPTIBLE);
8464 if (list_empty(&ep->asocs)) {
8466 timeo = schedule_timeout(timeo);
8471 if (!sctp_sstate(sk, LISTENING))
8475 if (!list_empty(&ep->asocs))
8478 err = sock_intr_errno(timeo);
8479 if (signal_pending(current))
8487 finish_wait(sk_sleep(sk), &wait);
8492 static void sctp_wait_for_close(struct sock *sk, long timeout)
8497 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8498 if (list_empty(&sctp_sk(sk)->ep->asocs))
8501 timeout = schedule_timeout(timeout);
8503 } while (!signal_pending(current) && timeout);
8505 finish_wait(sk_sleep(sk), &wait);
8508 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8510 struct sk_buff *frag;
8515 /* Don't forget the fragments. */
8516 skb_walk_frags(skb, frag)
8517 sctp_skb_set_owner_r_frag(frag, sk);
8520 sctp_skb_set_owner_r(skb, sk);
8523 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8524 struct sctp_association *asoc)
8526 struct inet_sock *inet = inet_sk(sk);
8527 struct inet_sock *newinet;
8528 struct sctp_sock *sp = sctp_sk(sk);
8529 struct sctp_endpoint *ep = sp->ep;
8531 newsk->sk_type = sk->sk_type;
8532 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8533 newsk->sk_flags = sk->sk_flags;
8534 newsk->sk_tsflags = sk->sk_tsflags;
8535 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8536 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8537 newsk->sk_reuse = sk->sk_reuse;
8539 newsk->sk_shutdown = sk->sk_shutdown;
8540 newsk->sk_destruct = sctp_destruct_sock;
8541 newsk->sk_family = sk->sk_family;
8542 newsk->sk_protocol = IPPROTO_SCTP;
8543 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8544 newsk->sk_sndbuf = sk->sk_sndbuf;
8545 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8546 newsk->sk_lingertime = sk->sk_lingertime;
8547 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8548 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8549 newsk->sk_rxhash = sk->sk_rxhash;
8551 newinet = inet_sk(newsk);
8553 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8554 * getsockname() and getpeername()
8556 newinet->inet_sport = inet->inet_sport;
8557 newinet->inet_saddr = inet->inet_saddr;
8558 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8559 newinet->inet_dport = htons(asoc->peer.port);
8560 newinet->pmtudisc = inet->pmtudisc;
8561 newinet->inet_id = asoc->next_tsn ^ jiffies;
8563 newinet->uc_ttl = inet->uc_ttl;
8564 newinet->mc_loop = 1;
8565 newinet->mc_ttl = 1;
8566 newinet->mc_index = 0;
8567 newinet->mc_list = NULL;
8569 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8570 net_enable_timestamp();
8572 /* Set newsk security attributes from orginal sk and connection
8573 * security attribute from ep.
8575 security_sctp_sk_clone(ep, sk, newsk);
8578 static inline void sctp_copy_descendant(struct sock *sk_to,
8579 const struct sock *sk_from)
8581 int ancestor_size = sizeof(struct inet_sock) +
8582 sizeof(struct sctp_sock) -
8583 offsetof(struct sctp_sock, auto_asconf_list);
8585 if (sk_from->sk_family == PF_INET6)
8586 ancestor_size += sizeof(struct ipv6_pinfo);
8588 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8591 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8592 * and its messages to the newsk.
8594 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8595 struct sctp_association *assoc,
8596 enum sctp_socket_type type)
8598 struct sctp_sock *oldsp = sctp_sk(oldsk);
8599 struct sctp_sock *newsp = sctp_sk(newsk);
8600 struct sctp_bind_bucket *pp; /* hash list port iterator */
8601 struct sctp_endpoint *newep = newsp->ep;
8602 struct sk_buff *skb, *tmp;
8603 struct sctp_ulpevent *event;
8604 struct sctp_bind_hashbucket *head;
8606 /* Migrate socket buffer sizes and all the socket level options to the
8609 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8610 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8611 /* Brute force copy old sctp opt. */
8612 sctp_copy_descendant(newsk, oldsk);
8614 /* Restore the ep value that was overwritten with the above structure
8620 /* Hook this new socket in to the bind_hash list. */
8621 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8622 inet_sk(oldsk)->inet_num)];
8623 spin_lock_bh(&head->lock);
8624 pp = sctp_sk(oldsk)->bind_hash;
8625 sk_add_bind_node(newsk, &pp->owner);
8626 sctp_sk(newsk)->bind_hash = pp;
8627 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8628 spin_unlock_bh(&head->lock);
8630 /* Copy the bind_addr list from the original endpoint to the new
8631 * endpoint so that we can handle restarts properly
8633 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8634 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8636 /* Move any messages in the old socket's receive queue that are for the
8637 * peeled off association to the new socket's receive queue.
8639 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8640 event = sctp_skb2event(skb);
8641 if (event->asoc == assoc) {
8642 __skb_unlink(skb, &oldsk->sk_receive_queue);
8643 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8644 sctp_skb_set_owner_r_frag(skb, newsk);
8648 /* Clean up any messages pending delivery due to partial
8649 * delivery. Three cases:
8650 * 1) No partial deliver; no work.
8651 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8652 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8654 skb_queue_head_init(&newsp->pd_lobby);
8655 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8657 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8658 struct sk_buff_head *queue;
8660 /* Decide which queue to move pd_lobby skbs to. */
8661 if (assoc->ulpq.pd_mode) {
8662 queue = &newsp->pd_lobby;
8664 queue = &newsk->sk_receive_queue;
8666 /* Walk through the pd_lobby, looking for skbs that
8667 * need moved to the new socket.
8669 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8670 event = sctp_skb2event(skb);
8671 if (event->asoc == assoc) {
8672 __skb_unlink(skb, &oldsp->pd_lobby);
8673 __skb_queue_tail(queue, skb);
8674 sctp_skb_set_owner_r_frag(skb, newsk);
8678 /* Clear up any skbs waiting for the partial
8679 * delivery to finish.
8681 if (assoc->ulpq.pd_mode)
8682 sctp_clear_pd(oldsk, NULL);
8686 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8688 /* Set the type of socket to indicate that it is peeled off from the
8689 * original UDP-style socket or created with the accept() call on a
8690 * TCP-style socket..
8694 /* Mark the new socket "in-use" by the user so that any packets
8695 * that may arrive on the association after we've moved it are
8696 * queued to the backlog. This prevents a potential race between
8697 * backlog processing on the old socket and new-packet processing
8698 * on the new socket.
8700 * The caller has just allocated newsk so we can guarantee that other
8701 * paths won't try to lock it and then oldsk.
8703 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8704 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
8705 sctp_assoc_migrate(assoc, newsk);
8706 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
8708 /* If the association on the newsk is already closed before accept()
8709 * is called, set RCV_SHUTDOWN flag.
8711 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8712 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
8713 newsk->sk_shutdown |= RCV_SHUTDOWN;
8715 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8718 release_sock(newsk);
8722 /* This proto struct describes the ULP interface for SCTP. */
8723 struct proto sctp_prot = {
8725 .owner = THIS_MODULE,
8726 .close = sctp_close,
8727 .connect = sctp_connect,
8728 .disconnect = sctp_disconnect,
8729 .accept = sctp_accept,
8730 .ioctl = sctp_ioctl,
8731 .init = sctp_init_sock,
8732 .destroy = sctp_destroy_sock,
8733 .shutdown = sctp_shutdown,
8734 .setsockopt = sctp_setsockopt,
8735 .getsockopt = sctp_getsockopt,
8736 .sendmsg = sctp_sendmsg,
8737 .recvmsg = sctp_recvmsg,
8739 .backlog_rcv = sctp_backlog_rcv,
8741 .unhash = sctp_unhash,
8742 .get_port = sctp_get_port,
8743 .obj_size = sizeof(struct sctp_sock),
8744 .useroffset = offsetof(struct sctp_sock, subscribe),
8745 .usersize = offsetof(struct sctp_sock, initmsg) -
8746 offsetof(struct sctp_sock, subscribe) +
8747 sizeof_field(struct sctp_sock, initmsg),
8748 .sysctl_mem = sysctl_sctp_mem,
8749 .sysctl_rmem = sysctl_sctp_rmem,
8750 .sysctl_wmem = sysctl_sctp_wmem,
8751 .memory_pressure = &sctp_memory_pressure,
8752 .enter_memory_pressure = sctp_enter_memory_pressure,
8753 .memory_allocated = &sctp_memory_allocated,
8754 .sockets_allocated = &sctp_sockets_allocated,
8757 #if IS_ENABLED(CONFIG_IPV6)
8759 #include <net/transp_v6.h>
8760 static void sctp_v6_destroy_sock(struct sock *sk)
8762 sctp_destroy_sock(sk);
8763 inet6_destroy_sock(sk);
8766 struct proto sctpv6_prot = {
8768 .owner = THIS_MODULE,
8769 .close = sctp_close,
8770 .connect = sctp_connect,
8771 .disconnect = sctp_disconnect,
8772 .accept = sctp_accept,
8773 .ioctl = sctp_ioctl,
8774 .init = sctp_init_sock,
8775 .destroy = sctp_v6_destroy_sock,
8776 .shutdown = sctp_shutdown,
8777 .setsockopt = sctp_setsockopt,
8778 .getsockopt = sctp_getsockopt,
8779 .sendmsg = sctp_sendmsg,
8780 .recvmsg = sctp_recvmsg,
8782 .backlog_rcv = sctp_backlog_rcv,
8784 .unhash = sctp_unhash,
8785 .get_port = sctp_get_port,
8786 .obj_size = sizeof(struct sctp6_sock),
8787 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
8788 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
8789 offsetof(struct sctp6_sock, sctp.subscribe) +
8790 sizeof_field(struct sctp6_sock, sctp.initmsg),
8791 .sysctl_mem = sysctl_sctp_mem,
8792 .sysctl_rmem = sysctl_sctp_rmem,
8793 .sysctl_wmem = sysctl_sctp_wmem,
8794 .memory_pressure = &sctp_memory_pressure,
8795 .enter_memory_pressure = sctp_enter_memory_pressure,
8796 .memory_allocated = &sctp_memory_allocated,
8797 .sockets_allocated = &sctp_sockets_allocated,
8799 #endif /* IS_ENABLED(CONFIG_IPV6) */