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>
69 #include <linux/rhashtable.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
76 #include <net/busy_poll.h>
78 #include <linux/socket.h> /* for sa_family_t */
79 #include <linux/export.h>
81 #include <net/sctp/sctp.h>
82 #include <net/sctp/sm.h>
83 #include <net/sctp/stream_sched.h>
85 /* Forward declarations for internal helper functions. */
86 static int sctp_writeable(struct sock *sk);
87 static void sctp_wfree(struct sk_buff *skb);
88 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
90 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
91 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
92 static int sctp_wait_for_accept(struct sock *sk, long timeo);
93 static void sctp_wait_for_close(struct sock *sk, long timeo);
94 static void sctp_destruct_sock(struct sock *sk);
95 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
96 union sctp_addr *addr, int len);
97 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
98 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
99 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf(struct sctp_association *asoc,
102 struct sctp_chunk *chunk);
103 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
104 static int sctp_autobind(struct sock *sk);
105 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
106 struct sctp_association *assoc,
107 enum sctp_socket_type type);
109 static unsigned long sctp_memory_pressure;
110 static atomic_long_t sctp_memory_allocated;
111 struct percpu_counter sctp_sockets_allocated;
113 static void sctp_enter_memory_pressure(struct sock *sk)
115 sctp_memory_pressure = 1;
119 /* Get the sndbuf space available at the time on the association. */
120 static inline int sctp_wspace(struct sctp_association *asoc)
124 if (asoc->ep->sndbuf_policy)
125 amt = asoc->sndbuf_used;
127 amt = sk_wmem_alloc_get(asoc->base.sk);
129 if (amt >= asoc->base.sk->sk_sndbuf) {
130 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
133 amt = sk_stream_wspace(asoc->base.sk);
138 amt = asoc->base.sk->sk_sndbuf - amt;
143 /* Increment the used sndbuf space count of the corresponding association by
144 * the size of the outgoing data chunk.
145 * Also, set the skb destructor for sndbuf accounting later.
147 * Since it is always 1-1 between chunk and skb, and also a new skb is always
148 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
149 * destructor in the data chunk skb for the purpose of the sndbuf space
152 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
154 struct sctp_association *asoc = chunk->asoc;
155 struct sock *sk = asoc->base.sk;
157 /* The sndbuf space is tracked per association. */
158 sctp_association_hold(asoc);
161 sctp_auth_shkey_hold(chunk->shkey);
163 skb_set_owner_w(chunk->skb, sk);
165 chunk->skb->destructor = sctp_wfree;
166 /* Save the chunk pointer in skb for sctp_wfree to use later. */
167 skb_shinfo(chunk->skb)->destructor_arg = chunk;
169 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
170 sizeof(struct sk_buff) +
171 sizeof(struct sctp_chunk);
173 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
174 sk->sk_wmem_queued += chunk->skb->truesize;
175 sk_mem_charge(sk, chunk->skb->truesize);
178 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
180 skb_orphan(chunk->skb);
183 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
184 void (*cb)(struct sctp_chunk *))
187 struct sctp_outq *q = &asoc->outqueue;
188 struct sctp_transport *t;
189 struct sctp_chunk *chunk;
191 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
192 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
195 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
198 list_for_each_entry(chunk, &q->sacked, transmitted_list)
201 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
204 list_for_each_entry(chunk, &q->out_chunk_list, list)
208 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
209 void (*cb)(struct sk_buff *, struct sock *))
212 struct sk_buff *skb, *tmp;
214 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
217 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
220 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
224 /* Verify that this is a valid address. */
225 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
230 /* Verify basic sockaddr. */
231 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
235 /* Is this a valid SCTP address? */
236 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
239 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
245 /* Look up the association by its id. If this is not a UDP-style
246 * socket, the ID field is always ignored.
248 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
250 struct sctp_association *asoc = NULL;
252 /* If this is not a UDP-style socket, assoc id should be ignored. */
253 if (!sctp_style(sk, UDP)) {
254 /* Return NULL if the socket state is not ESTABLISHED. It
255 * could be a TCP-style listening socket or a socket which
256 * hasn't yet called connect() to establish an association.
258 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
261 /* Get the first and the only association from the list. */
262 if (!list_empty(&sctp_sk(sk)->ep->asocs))
263 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
264 struct sctp_association, asocs);
268 /* Otherwise this is a UDP-style socket. */
269 if (!id || (id == (sctp_assoc_t)-1))
272 spin_lock_bh(&sctp_assocs_id_lock);
273 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
274 spin_unlock_bh(&sctp_assocs_id_lock);
276 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
282 /* Look up the transport from an address and an assoc id. If both address and
283 * id are specified, the associations matching the address and the id should be
286 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
287 struct sockaddr_storage *addr,
290 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
291 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
292 union sctp_addr *laddr = (union sctp_addr *)addr;
293 struct sctp_transport *transport;
295 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
298 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
305 id_asoc = sctp_id2assoc(sk, id);
306 if (id_asoc && (id_asoc != addr_asoc))
309 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
310 (union sctp_addr *)addr);
315 /* API 3.1.2 bind() - UDP Style Syntax
316 * The syntax of bind() is,
318 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
320 * sd - the socket descriptor returned by socket().
321 * addr - the address structure (struct sockaddr_in or struct
322 * sockaddr_in6 [RFC 2553]),
323 * addr_len - the size of the address structure.
325 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
331 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
334 /* Disallow binding twice. */
335 if (!sctp_sk(sk)->ep->base.bind_addr.port)
336 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
346 static long sctp_get_port_local(struct sock *, union sctp_addr *);
348 /* Verify this is a valid sockaddr. */
349 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
350 union sctp_addr *addr, int len)
354 /* Check minimum size. */
355 if (len < sizeof (struct sockaddr))
358 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
361 if (addr->sa.sa_family == AF_INET6) {
362 if (len < SIN6_LEN_RFC2133)
364 /* V4 mapped address are really of AF_INET family */
365 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
366 !opt->pf->af_supported(AF_INET, opt))
370 /* If we get this far, af is valid. */
371 af = sctp_get_af_specific(addr->sa.sa_family);
373 if (len < af->sockaddr_len)
379 /* Bind a local address either to an endpoint or to an association. */
380 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
382 struct net *net = sock_net(sk);
383 struct sctp_sock *sp = sctp_sk(sk);
384 struct sctp_endpoint *ep = sp->ep;
385 struct sctp_bind_addr *bp = &ep->base.bind_addr;
390 /* Common sockaddr verification. */
391 af = sctp_sockaddr_af(sp, addr, len);
393 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
394 __func__, sk, addr, len);
398 snum = ntohs(addr->v4.sin_port);
400 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
401 __func__, sk, &addr->sa, bp->port, snum, len);
403 /* PF specific bind() address verification. */
404 if (!sp->pf->bind_verify(sp, addr))
405 return -EADDRNOTAVAIL;
407 /* We must either be unbound, or bind to the same port.
408 * It's OK to allow 0 ports if we are already bound.
409 * We'll just inhert an already bound port in this case
414 else if (snum != bp->port) {
415 pr_debug("%s: new port %d doesn't match existing port "
416 "%d\n", __func__, snum, bp->port);
421 if (snum && snum < inet_prot_sock(net) &&
422 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
425 /* See if the address matches any of the addresses we may have
426 * already bound before checking against other endpoints.
428 if (sctp_bind_addr_match(bp, addr, sp))
431 /* Make sure we are allowed to bind here.
432 * The function sctp_get_port_local() does duplicate address
435 addr->v4.sin_port = htons(snum);
436 if ((ret = sctp_get_port_local(sk, addr))) {
440 /* Refresh ephemeral port. */
442 bp->port = inet_sk(sk)->inet_num;
444 /* Add the address to the bind address list.
445 * Use GFP_ATOMIC since BHs will be disabled.
447 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
448 SCTP_ADDR_SRC, GFP_ATOMIC);
450 /* Copy back into socket for getsockname() use. */
452 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
453 sp->pf->to_sk_saddr(addr, sk);
459 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
461 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
462 * at any one time. If a sender, after sending an ASCONF chunk, decides
463 * it needs to transfer another ASCONF Chunk, it MUST wait until the
464 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
465 * subsequent ASCONF. Note this restriction binds each side, so at any
466 * time two ASCONF may be in-transit on any given association (one sent
467 * from each endpoint).
469 static int sctp_send_asconf(struct sctp_association *asoc,
470 struct sctp_chunk *chunk)
472 struct net *net = sock_net(asoc->base.sk);
475 /* If there is an outstanding ASCONF chunk, queue it for later
478 if (asoc->addip_last_asconf) {
479 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
483 /* Hold the chunk until an ASCONF_ACK is received. */
484 sctp_chunk_hold(chunk);
485 retval = sctp_primitive_ASCONF(net, asoc, chunk);
487 sctp_chunk_free(chunk);
489 asoc->addip_last_asconf = chunk;
495 /* Add a list of addresses as bind addresses to local endpoint or
498 * Basically run through each address specified in the addrs/addrcnt
499 * array/length pair, determine if it is IPv6 or IPv4 and call
500 * sctp_do_bind() on it.
502 * If any of them fails, then the operation will be reversed and the
503 * ones that were added will be removed.
505 * Only sctp_setsockopt_bindx() is supposed to call this function.
507 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
512 struct sockaddr *sa_addr;
515 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
519 for (cnt = 0; cnt < addrcnt; cnt++) {
520 /* The list may contain either IPv4 or IPv6 address;
521 * determine the address length for walking thru the list.
524 af = sctp_get_af_specific(sa_addr->sa_family);
530 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
533 addr_buf += af->sockaddr_len;
537 /* Failed. Cleanup the ones that have been added */
539 sctp_bindx_rem(sk, addrs, cnt);
547 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
548 * associations that are part of the endpoint indicating that a list of local
549 * addresses are added to the endpoint.
551 * If any of the addresses is already in the bind address list of the
552 * association, we do not send the chunk for that association. But it will not
553 * affect other associations.
555 * Only sctp_setsockopt_bindx() is supposed to call this function.
557 static int sctp_send_asconf_add_ip(struct sock *sk,
558 struct sockaddr *addrs,
561 struct net *net = sock_net(sk);
562 struct sctp_sock *sp;
563 struct sctp_endpoint *ep;
564 struct sctp_association *asoc;
565 struct sctp_bind_addr *bp;
566 struct sctp_chunk *chunk;
567 struct sctp_sockaddr_entry *laddr;
568 union sctp_addr *addr;
569 union sctp_addr saveaddr;
576 if (!net->sctp.addip_enable)
582 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
583 __func__, sk, addrs, addrcnt);
585 list_for_each_entry(asoc, &ep->asocs, asocs) {
586 if (!asoc->peer.asconf_capable)
589 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
592 if (!sctp_state(asoc, ESTABLISHED))
595 /* Check if any address in the packed array of addresses is
596 * in the bind address list of the association. If so,
597 * do not send the asconf chunk to its peer, but continue with
598 * other associations.
601 for (i = 0; i < addrcnt; i++) {
603 af = sctp_get_af_specific(addr->v4.sin_family);
609 if (sctp_assoc_lookup_laddr(asoc, addr))
612 addr_buf += af->sockaddr_len;
617 /* Use the first valid address in bind addr list of
618 * association as Address Parameter of ASCONF CHUNK.
620 bp = &asoc->base.bind_addr;
621 p = bp->address_list.next;
622 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
623 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
624 addrcnt, SCTP_PARAM_ADD_IP);
630 /* Add the new addresses to the bind address list with
631 * use_as_src set to 0.
634 for (i = 0; i < addrcnt; i++) {
636 af = sctp_get_af_specific(addr->v4.sin_family);
637 memcpy(&saveaddr, addr, af->sockaddr_len);
638 retval = sctp_add_bind_addr(bp, &saveaddr,
640 SCTP_ADDR_NEW, GFP_ATOMIC);
641 addr_buf += af->sockaddr_len;
643 if (asoc->src_out_of_asoc_ok) {
644 struct sctp_transport *trans;
646 list_for_each_entry(trans,
647 &asoc->peer.transport_addr_list, transports) {
648 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
649 2*asoc->pathmtu, 4380));
650 trans->ssthresh = asoc->peer.i.a_rwnd;
651 trans->rto = asoc->rto_initial;
652 sctp_max_rto(asoc, trans);
653 trans->rtt = trans->srtt = trans->rttvar = 0;
654 /* Clear the source and route cache */
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_route(transport, NULL,
900 sctp_sk(asoc->base.sk));
904 /* We don't need to transmit ASCONF */
906 retval = sctp_send_asconf(asoc, chunk);
912 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
913 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
915 struct sock *sk = sctp_opt2sk(sp);
916 union sctp_addr *addr;
919 /* It is safe to write port space in caller. */
921 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
922 af = sctp_get_af_specific(addr->sa.sa_family);
925 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
928 if (addrw->state == SCTP_ADDR_NEW)
929 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
931 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
934 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
937 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
940 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
941 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
944 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
945 * Section 3.1.2 for this usage.
947 * addrs is a pointer to an array of one or more socket addresses. Each
948 * address is contained in its appropriate structure (i.e. struct
949 * sockaddr_in or struct sockaddr_in6) the family of the address type
950 * must be used to distinguish the address length (note that this
951 * representation is termed a "packed array" of addresses). The caller
952 * specifies the number of addresses in the array with addrcnt.
954 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
955 * -1, and sets errno to the appropriate error code.
957 * For SCTP, the port given in each socket address must be the same, or
958 * sctp_bindx() will fail, setting errno to EINVAL.
960 * The flags parameter is formed from the bitwise OR of zero or more of
961 * the following currently defined flags:
963 * SCTP_BINDX_ADD_ADDR
965 * SCTP_BINDX_REM_ADDR
967 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
968 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
969 * addresses from the association. The two flags are mutually exclusive;
970 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
971 * not remove all addresses from an association; sctp_bindx() will
972 * reject such an attempt with EINVAL.
974 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
975 * additional addresses with an endpoint after calling bind(). Or use
976 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
977 * socket is associated with so that no new association accepted will be
978 * associated with those addresses. If the endpoint supports dynamic
979 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
980 * endpoint to send the appropriate message to the peer to change the
981 * peers address lists.
983 * Adding and removing addresses from a connected association is
984 * optional functionality. Implementations that do not support this
985 * functionality should return EOPNOTSUPP.
987 * Basically do nothing but copying the addresses from user to kernel
988 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
989 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
992 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
995 * sk The sk of the socket
996 * addrs The pointer to the addresses in user land
997 * addrssize Size of the addrs buffer
998 * op Operation to perform (add or remove, see the flags of
1001 * Returns 0 if ok, <0 errno code on error.
1003 static int sctp_setsockopt_bindx(struct sock *sk,
1004 struct sockaddr __user *addrs,
1005 int addrs_size, int op)
1007 struct sockaddr *kaddrs;
1011 struct sockaddr *sa_addr;
1015 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1016 __func__, sk, addrs, addrs_size, op);
1018 if (unlikely(addrs_size <= 0))
1021 kaddrs = vmemdup_user(addrs, addrs_size);
1022 if (unlikely(IS_ERR(kaddrs)))
1023 return PTR_ERR(kaddrs);
1025 /* Walk through the addrs buffer and count the number of addresses. */
1027 while (walk_size < addrs_size) {
1028 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1034 af = sctp_get_af_specific(sa_addr->sa_family);
1036 /* If the address family is not supported or if this address
1037 * causes the address buffer to overflow return EINVAL.
1039 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1044 addr_buf += af->sockaddr_len;
1045 walk_size += af->sockaddr_len;
1050 case SCTP_BINDX_ADD_ADDR:
1051 /* Allow security module to validate bindx addresses. */
1052 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1053 (struct sockaddr *)kaddrs,
1057 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1060 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1063 case SCTP_BINDX_REM_ADDR:
1064 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1067 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1081 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1083 * Common routine for handling connect() and sctp_connectx().
1084 * Connect will come in with just a single address.
1086 static int __sctp_connect(struct sock *sk,
1087 struct sockaddr *kaddrs,
1088 int addrs_size, int flags,
1089 sctp_assoc_t *assoc_id)
1091 struct net *net = sock_net(sk);
1092 struct sctp_sock *sp;
1093 struct sctp_endpoint *ep;
1094 struct sctp_association *asoc = NULL;
1095 struct sctp_association *asoc2;
1096 struct sctp_transport *transport;
1098 enum sctp_scope scope;
1103 union sctp_addr *sa_addr = NULL;
1105 unsigned short port;
1110 /* connect() cannot be done on a socket that is already in ESTABLISHED
1111 * state - UDP-style peeled off socket or a TCP-style socket that
1112 * is already connected.
1113 * It cannot be done even on a TCP-style listening socket.
1115 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1116 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1121 /* Walk through the addrs buffer and count the number of addresses. */
1123 while (walk_size < addrs_size) {
1126 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1132 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1134 /* If the address family is not supported or if this address
1135 * causes the address buffer to overflow return EINVAL.
1137 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1142 port = ntohs(sa_addr->v4.sin_port);
1144 /* Save current address so we can work with it */
1145 memcpy(&to, sa_addr, af->sockaddr_len);
1147 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1151 /* Make sure the destination port is correctly set
1154 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1159 /* Check if there already is a matching association on the
1160 * endpoint (other than the one created here).
1162 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1163 if (asoc2 && asoc2 != asoc) {
1164 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1171 /* If we could not find a matching association on the endpoint,
1172 * make sure that there is no peeled-off association matching
1173 * the peer address even on another socket.
1175 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1176 err = -EADDRNOTAVAIL;
1181 /* If a bind() or sctp_bindx() is not called prior to
1182 * an sctp_connectx() call, the system picks an
1183 * ephemeral port and will choose an address set
1184 * equivalent to binding with a wildcard address.
1186 if (!ep->base.bind_addr.port) {
1187 if (sctp_autobind(sk)) {
1193 * If an unprivileged user inherits a 1-many
1194 * style socket with open associations on a
1195 * privileged port, it MAY be permitted to
1196 * accept new associations, but it SHOULD NOT
1197 * be permitted to open new associations.
1199 if (ep->base.bind_addr.port <
1200 inet_prot_sock(net) &&
1201 !ns_capable(net->user_ns,
1202 CAP_NET_BIND_SERVICE)) {
1208 scope = sctp_scope(&to);
1209 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1215 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1223 /* Prime the peer's transport structures. */
1224 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1232 addr_buf += af->sockaddr_len;
1233 walk_size += af->sockaddr_len;
1236 /* In case the user of sctp_connectx() wants an association
1237 * id back, assign one now.
1240 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1245 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1250 /* Initialize sk's dport and daddr for getpeername() */
1251 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1252 sp->pf->to_sk_daddr(sa_addr, sk);
1255 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1258 *assoc_id = asoc->assoc_id;
1260 err = sctp_wait_for_connect(asoc, &timeo);
1261 /* Note: the asoc may be freed after the return of
1262 * sctp_wait_for_connect.
1265 /* Don't free association on exit. */
1269 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1270 __func__, asoc, kaddrs, err);
1273 /* sctp_primitive_ASSOCIATE may have added this association
1274 * To the hash table, try to unhash it, just in case, its a noop
1275 * if it wasn't hashed so we're safe
1277 sctp_association_free(asoc);
1282 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1285 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1286 * sctp_assoc_t *asoc);
1288 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1289 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1290 * or IPv6 addresses.
1292 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1293 * Section 3.1.2 for this usage.
1295 * addrs is a pointer to an array of one or more socket addresses. Each
1296 * address is contained in its appropriate structure (i.e. struct
1297 * sockaddr_in or struct sockaddr_in6) the family of the address type
1298 * must be used to distengish the address length (note that this
1299 * representation is termed a "packed array" of addresses). The caller
1300 * specifies the number of addresses in the array with addrcnt.
1302 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1303 * the association id of the new association. On failure, sctp_connectx()
1304 * returns -1, and sets errno to the appropriate error code. The assoc_id
1305 * is not touched by the kernel.
1307 * For SCTP, the port given in each socket address must be the same, or
1308 * sctp_connectx() will fail, setting errno to EINVAL.
1310 * An application can use sctp_connectx to initiate an association with
1311 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1312 * allows a caller to specify multiple addresses at which a peer can be
1313 * reached. The way the SCTP stack uses the list of addresses to set up
1314 * the association is implementation dependent. This function only
1315 * specifies that the stack will try to make use of all the addresses in
1316 * the list when needed.
1318 * Note that the list of addresses passed in is only used for setting up
1319 * the association. It does not necessarily equal the set of addresses
1320 * the peer uses for the resulting association. If the caller wants to
1321 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1322 * retrieve them after the association has been set up.
1324 * Basically do nothing but copying the addresses from user to kernel
1325 * land and invoking either sctp_connectx(). This is used for tunneling
1326 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1328 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1331 * sk The sk of the socket
1332 * addrs The pointer to the addresses in user land
1333 * addrssize Size of the addrs buffer
1335 * Returns >=0 if ok, <0 errno code on error.
1337 static int __sctp_setsockopt_connectx(struct sock *sk,
1338 struct sockaddr __user *addrs,
1340 sctp_assoc_t *assoc_id)
1342 struct sockaddr *kaddrs;
1343 int err = 0, flags = 0;
1345 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1346 __func__, sk, addrs, addrs_size);
1348 if (unlikely(addrs_size <= 0))
1351 kaddrs = vmemdup_user(addrs, addrs_size);
1352 if (unlikely(IS_ERR(kaddrs)))
1353 return PTR_ERR(kaddrs);
1355 /* Allow security module to validate connectx addresses. */
1356 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1357 (struct sockaddr *)kaddrs,
1362 /* in-kernel sockets don't generally have a file allocated to them
1363 * if all they do is call sock_create_kern().
1365 if (sk->sk_socket->file)
1366 flags = sk->sk_socket->file->f_flags;
1368 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1377 * This is an older interface. It's kept for backward compatibility
1378 * to the option that doesn't provide association id.
1380 static int sctp_setsockopt_connectx_old(struct sock *sk,
1381 struct sockaddr __user *addrs,
1384 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1388 * New interface for the API. The since the API is done with a socket
1389 * option, to make it simple we feed back the association id is as a return
1390 * indication to the call. Error is always negative and association id is
1393 static int sctp_setsockopt_connectx(struct sock *sk,
1394 struct sockaddr __user *addrs,
1397 sctp_assoc_t assoc_id = 0;
1400 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1409 * New (hopefully final) interface for the API.
1410 * We use the sctp_getaddrs_old structure so that use-space library
1411 * can avoid any unnecessary allocations. The only different part
1412 * is that we store the actual length of the address buffer into the
1413 * addrs_num structure member. That way we can re-use the existing
1416 #ifdef CONFIG_COMPAT
1417 struct compat_sctp_getaddrs_old {
1418 sctp_assoc_t assoc_id;
1420 compat_uptr_t addrs; /* struct sockaddr * */
1424 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1425 char __user *optval,
1428 struct sctp_getaddrs_old param;
1429 sctp_assoc_t assoc_id = 0;
1432 #ifdef CONFIG_COMPAT
1433 if (in_compat_syscall()) {
1434 struct compat_sctp_getaddrs_old param32;
1436 if (len < sizeof(param32))
1438 if (copy_from_user(¶m32, optval, sizeof(param32)))
1441 param.assoc_id = param32.assoc_id;
1442 param.addr_num = param32.addr_num;
1443 param.addrs = compat_ptr(param32.addrs);
1447 if (len < sizeof(param))
1449 if (copy_from_user(¶m, optval, sizeof(param)))
1453 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1454 param.addrs, param.addr_num,
1456 if (err == 0 || err == -EINPROGRESS) {
1457 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1459 if (put_user(sizeof(assoc_id), optlen))
1466 /* API 3.1.4 close() - UDP Style Syntax
1467 * Applications use close() to perform graceful shutdown (as described in
1468 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1469 * by a UDP-style socket.
1473 * ret = close(int sd);
1475 * sd - the socket descriptor of the associations to be closed.
1477 * To gracefully shutdown a specific association represented by the
1478 * UDP-style socket, an application should use the sendmsg() call,
1479 * passing no user data, but including the appropriate flag in the
1480 * ancillary data (see Section xxxx).
1482 * If sd in the close() call is a branched-off socket representing only
1483 * one association, the shutdown is performed on that association only.
1485 * 4.1.6 close() - TCP Style Syntax
1487 * Applications use close() to gracefully close down an association.
1491 * int close(int sd);
1493 * sd - the socket descriptor of the association to be closed.
1495 * After an application calls close() on a socket descriptor, no further
1496 * socket operations will succeed on that descriptor.
1498 * API 7.1.4 SO_LINGER
1500 * An application using the TCP-style socket can use this option to
1501 * perform the SCTP ABORT primitive. The linger option structure is:
1504 * int l_onoff; // option on/off
1505 * int l_linger; // linger time
1508 * To enable the option, set l_onoff to 1. If the l_linger value is set
1509 * to 0, calling close() is the same as the ABORT primitive. If the
1510 * value is set to a negative value, the setsockopt() call will return
1511 * an error. If the value is set to a positive value linger_time, the
1512 * close() can be blocked for at most linger_time ms. If the graceful
1513 * shutdown phase does not finish during this period, close() will
1514 * return but the graceful shutdown phase continues in the system.
1516 static void sctp_close(struct sock *sk, long timeout)
1518 struct net *net = sock_net(sk);
1519 struct sctp_endpoint *ep;
1520 struct sctp_association *asoc;
1521 struct list_head *pos, *temp;
1522 unsigned int data_was_unread;
1524 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1526 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1527 sk->sk_shutdown = SHUTDOWN_MASK;
1528 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1530 ep = sctp_sk(sk)->ep;
1532 /* Clean up any skbs sitting on the receive queue. */
1533 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1534 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1536 /* Walk all associations on an endpoint. */
1537 list_for_each_safe(pos, temp, &ep->asocs) {
1538 asoc = list_entry(pos, struct sctp_association, asocs);
1540 if (sctp_style(sk, TCP)) {
1541 /* A closed association can still be in the list if
1542 * it belongs to a TCP-style listening socket that is
1543 * not yet accepted. If so, free it. If not, send an
1544 * ABORT or SHUTDOWN based on the linger options.
1546 if (sctp_state(asoc, CLOSED)) {
1547 sctp_association_free(asoc);
1552 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1553 !skb_queue_empty(&asoc->ulpq.reasm) ||
1554 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1555 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1556 struct sctp_chunk *chunk;
1558 chunk = sctp_make_abort_user(asoc, NULL, 0);
1559 sctp_primitive_ABORT(net, asoc, chunk);
1561 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1564 /* On a TCP-style socket, block for at most linger_time if set. */
1565 if (sctp_style(sk, TCP) && timeout)
1566 sctp_wait_for_close(sk, timeout);
1568 /* This will run the backlog queue. */
1571 /* Supposedly, no process has access to the socket, but
1572 * the net layers still may.
1573 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1574 * held and that should be grabbed before socket lock.
1576 spin_lock_bh(&net->sctp.addr_wq_lock);
1577 bh_lock_sock_nested(sk);
1579 /* Hold the sock, since sk_common_release() will put sock_put()
1580 * and we have just a little more cleanup.
1583 sk_common_release(sk);
1586 spin_unlock_bh(&net->sctp.addr_wq_lock);
1590 SCTP_DBG_OBJCNT_DEC(sock);
1593 /* Handle EPIPE error. */
1594 static int sctp_error(struct sock *sk, int flags, int err)
1597 err = sock_error(sk) ? : -EPIPE;
1598 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1599 send_sig(SIGPIPE, current, 0);
1603 /* API 3.1.3 sendmsg() - UDP Style Syntax
1605 * An application uses sendmsg() and recvmsg() calls to transmit data to
1606 * and receive data from its peer.
1608 * ssize_t sendmsg(int socket, const struct msghdr *message,
1611 * socket - the socket descriptor of the endpoint.
1612 * message - pointer to the msghdr structure which contains a single
1613 * user message and possibly some ancillary data.
1615 * See Section 5 for complete description of the data
1618 * flags - flags sent or received with the user message, see Section
1619 * 5 for complete description of the flags.
1621 * Note: This function could use a rewrite especially when explicit
1622 * connect support comes in.
1624 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1626 static int sctp_msghdr_parse(const struct msghdr *msg,
1627 struct sctp_cmsgs *cmsgs);
1629 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1630 struct sctp_sndrcvinfo *srinfo,
1631 const struct msghdr *msg, size_t msg_len)
1636 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1639 if (msg_len > sk->sk_sndbuf)
1642 memset(cmsgs, 0, sizeof(*cmsgs));
1643 err = sctp_msghdr_parse(msg, cmsgs);
1645 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1649 memset(srinfo, 0, sizeof(*srinfo));
1650 if (cmsgs->srinfo) {
1651 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1652 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1653 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1654 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1655 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1656 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1660 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1661 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1662 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1663 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1664 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1667 if (cmsgs->prinfo) {
1668 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1669 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1670 cmsgs->prinfo->pr_policy);
1673 sflags = srinfo->sinfo_flags;
1674 if (!sflags && msg_len)
1677 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1680 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1681 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1684 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1690 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1691 struct sctp_cmsgs *cmsgs,
1692 union sctp_addr *daddr,
1693 struct sctp_transport **tp)
1695 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1696 struct net *net = sock_net(sk);
1697 struct sctp_association *asoc;
1698 enum sctp_scope scope;
1699 struct cmsghdr *cmsg;
1700 __be32 flowinfo = 0;
1706 if (sflags & (SCTP_EOF | SCTP_ABORT))
1709 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1710 sctp_sstate(sk, CLOSING)))
1711 return -EADDRNOTAVAIL;
1713 if (sctp_endpoint_is_peeled_off(ep, daddr))
1714 return -EADDRNOTAVAIL;
1716 if (!ep->base.bind_addr.port) {
1717 if (sctp_autobind(sk))
1720 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1721 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1725 scope = sctp_scope(daddr);
1727 /* Label connection socket for first association 1-to-many
1728 * style for client sequence socket()->sendmsg(). This
1729 * needs to be done before sctp_assoc_add_peer() as that will
1730 * set up the initial packet that needs to account for any
1731 * security ip options (CIPSO/CALIPSO) added to the packet.
1733 af = sctp_get_af_specific(daddr->sa.sa_family);
1736 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1737 (struct sockaddr *)daddr,
1742 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1746 if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1752 struct sctp_initmsg *init = cmsgs->init;
1754 if (init->sinit_num_ostreams) {
1755 __u16 outcnt = init->sinit_num_ostreams;
1757 asoc->c.sinit_num_ostreams = outcnt;
1758 /* outcnt has been changed, need to re-init stream */
1759 err = sctp_stream_init(&asoc->stream, outcnt, 0,
1765 if (init->sinit_max_instreams)
1766 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1768 if (init->sinit_max_attempts)
1769 asoc->max_init_attempts = init->sinit_max_attempts;
1771 if (init->sinit_max_init_timeo)
1772 asoc->max_init_timeo =
1773 msecs_to_jiffies(init->sinit_max_init_timeo);
1776 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1782 if (!cmsgs->addrs_msg)
1785 if (daddr->sa.sa_family == AF_INET6)
1786 flowinfo = daddr->v6.sin6_flowinfo;
1788 /* sendv addr list parse */
1789 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1790 struct sctp_transport *transport;
1791 struct sctp_association *old;
1792 union sctp_addr _daddr;
1795 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1796 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1797 cmsg->cmsg_type != SCTP_DSTADDRV6))
1801 memset(daddr, 0, sizeof(*daddr));
1802 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1803 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1804 if (dlen < sizeof(struct in_addr)) {
1809 dlen = sizeof(struct in_addr);
1810 daddr->v4.sin_family = AF_INET;
1811 daddr->v4.sin_port = htons(asoc->peer.port);
1812 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1814 if (dlen < sizeof(struct in6_addr)) {
1819 dlen = sizeof(struct in6_addr);
1820 daddr->v6.sin6_flowinfo = flowinfo;
1821 daddr->v6.sin6_family = AF_INET6;
1822 daddr->v6.sin6_port = htons(asoc->peer.port);
1823 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1825 err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
1829 old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1830 if (old && old != asoc) {
1831 if (old->state >= SCTP_STATE_ESTABLISHED)
1838 if (sctp_endpoint_is_peeled_off(ep, daddr)) {
1839 err = -EADDRNOTAVAIL;
1843 transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
1854 sctp_association_free(asoc);
1858 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1859 __u16 sflags, struct msghdr *msg,
1862 struct sock *sk = asoc->base.sk;
1863 struct net *net = sock_net(sk);
1865 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1868 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1869 !sctp_state(asoc, ESTABLISHED))
1872 if (sflags & SCTP_EOF) {
1873 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1874 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1879 if (sflags & SCTP_ABORT) {
1880 struct sctp_chunk *chunk;
1882 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1886 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1887 sctp_primitive_ABORT(net, asoc, chunk);
1895 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1896 struct msghdr *msg, size_t msg_len,
1897 struct sctp_transport *transport,
1898 struct sctp_sndrcvinfo *sinfo)
1900 struct sock *sk = asoc->base.sk;
1901 struct sctp_sock *sp = sctp_sk(sk);
1902 struct net *net = sock_net(sk);
1903 struct sctp_datamsg *datamsg;
1904 bool wait_connect = false;
1905 struct sctp_chunk *chunk;
1909 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1914 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1915 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1920 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1925 if (asoc->pmtu_pending) {
1926 if (sp->param_flags & SPP_PMTUD_ENABLE)
1927 sctp_assoc_sync_pmtu(asoc);
1928 asoc->pmtu_pending = 0;
1931 if (sctp_wspace(asoc) < msg_len)
1932 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1934 if (!sctp_wspace(asoc)) {
1935 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1936 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1941 if (sctp_state(asoc, CLOSED)) {
1942 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1946 if (sp->strm_interleave) {
1947 timeo = sock_sndtimeo(sk, 0);
1948 err = sctp_wait_for_connect(asoc, &timeo);
1952 wait_connect = true;
1955 pr_debug("%s: we associated primitively\n", __func__);
1958 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1959 if (IS_ERR(datamsg)) {
1960 err = PTR_ERR(datamsg);
1964 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1966 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1967 sctp_chunk_hold(chunk);
1968 sctp_set_owner_w(chunk);
1969 chunk->transport = transport;
1972 err = sctp_primitive_SEND(net, asoc, datamsg);
1974 sctp_datamsg_free(datamsg);
1978 pr_debug("%s: we sent primitively\n", __func__);
1980 sctp_datamsg_put(datamsg);
1982 if (unlikely(wait_connect)) {
1983 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1984 sctp_wait_for_connect(asoc, &timeo);
1993 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1994 const struct msghdr *msg,
1995 struct sctp_cmsgs *cmsgs)
1997 union sctp_addr *daddr = NULL;
2000 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
2001 int len = msg->msg_namelen;
2003 if (len > sizeof(*daddr))
2004 len = sizeof(*daddr);
2006 daddr = (union sctp_addr *)msg->msg_name;
2008 err = sctp_verify_addr(sk, daddr, len);
2010 return ERR_PTR(err);
2016 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2017 struct sctp_sndrcvinfo *sinfo,
2018 struct sctp_cmsgs *cmsgs)
2020 if (!cmsgs->srinfo && !cmsgs->sinfo) {
2021 sinfo->sinfo_stream = asoc->default_stream;
2022 sinfo->sinfo_ppid = asoc->default_ppid;
2023 sinfo->sinfo_context = asoc->default_context;
2024 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2027 sinfo->sinfo_flags = asoc->default_flags;
2030 if (!cmsgs->srinfo && !cmsgs->prinfo)
2031 sinfo->sinfo_timetolive = asoc->default_timetolive;
2033 if (cmsgs->authinfo) {
2034 /* Reuse sinfo_tsn to indicate that authinfo was set and
2035 * sinfo_ssn to save the keyid on tx path.
2037 sinfo->sinfo_tsn = 1;
2038 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2042 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2044 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2045 struct sctp_transport *transport = NULL;
2046 struct sctp_sndrcvinfo _sinfo, *sinfo;
2047 struct sctp_association *asoc;
2048 struct sctp_cmsgs cmsgs;
2049 union sctp_addr *daddr;
2054 /* Parse and get snd_info */
2055 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2060 sflags = sinfo->sinfo_flags;
2062 /* Get daddr from msg */
2063 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2064 if (IS_ERR(daddr)) {
2065 err = PTR_ERR(daddr);
2071 /* SCTP_SENDALL process */
2072 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2073 list_for_each_entry(asoc, &ep->asocs, asocs) {
2074 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2081 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2083 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2088 iov_iter_revert(&msg->msg_iter, err);
2094 /* Get and check or create asoc */
2096 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2098 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2103 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2108 asoc = transport->asoc;
2112 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2115 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2121 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2126 /* Update snd_info with the asoc */
2127 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2129 /* Send msg to the asoc */
2130 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2131 if (err < 0 && err != -ESRCH && new)
2132 sctp_association_free(asoc);
2137 return sctp_error(sk, msg->msg_flags, err);
2140 /* This is an extended version of skb_pull() that removes the data from the
2141 * start of a skb even when data is spread across the list of skb's in the
2142 * frag_list. len specifies the total amount of data that needs to be removed.
2143 * when 'len' bytes could be removed from the skb, it returns 0.
2144 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2145 * could not be removed.
2147 static int sctp_skb_pull(struct sk_buff *skb, int len)
2149 struct sk_buff *list;
2150 int skb_len = skb_headlen(skb);
2153 if (len <= skb_len) {
2154 __skb_pull(skb, len);
2158 __skb_pull(skb, skb_len);
2160 skb_walk_frags(skb, list) {
2161 rlen = sctp_skb_pull(list, len);
2162 skb->len -= (len-rlen);
2163 skb->data_len -= (len-rlen);
2174 /* API 3.1.3 recvmsg() - UDP Style Syntax
2176 * ssize_t recvmsg(int socket, struct msghdr *message,
2179 * socket - the socket descriptor of the endpoint.
2180 * message - pointer to the msghdr structure which contains a single
2181 * user message and possibly some ancillary data.
2183 * See Section 5 for complete description of the data
2186 * flags - flags sent or received with the user message, see Section
2187 * 5 for complete description of the flags.
2189 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2190 int noblock, int flags, int *addr_len)
2192 struct sctp_ulpevent *event = NULL;
2193 struct sctp_sock *sp = sctp_sk(sk);
2194 struct sk_buff *skb, *head_skb;
2199 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2200 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2205 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2206 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2211 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2215 /* Get the total length of the skb including any skb's in the
2224 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2226 event = sctp_skb2event(skb);
2231 if (event->chunk && event->chunk->head_skb)
2232 head_skb = event->chunk->head_skb;
2235 sock_recv_ts_and_drops(msg, sk, head_skb);
2236 if (sctp_ulpevent_is_notification(event)) {
2237 msg->msg_flags |= MSG_NOTIFICATION;
2238 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2240 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2243 /* Check if we allow SCTP_NXTINFO. */
2244 if (sp->recvnxtinfo)
2245 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2246 /* Check if we allow SCTP_RCVINFO. */
2247 if (sp->recvrcvinfo)
2248 sctp_ulpevent_read_rcvinfo(event, msg);
2249 /* Check if we allow SCTP_SNDRCVINFO. */
2250 if (sp->subscribe.sctp_data_io_event)
2251 sctp_ulpevent_read_sndrcvinfo(event, msg);
2255 /* If skb's length exceeds the user's buffer, update the skb and
2256 * push it back to the receive_queue so that the next call to
2257 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2259 if (skb_len > copied) {
2260 msg->msg_flags &= ~MSG_EOR;
2261 if (flags & MSG_PEEK)
2263 sctp_skb_pull(skb, copied);
2264 skb_queue_head(&sk->sk_receive_queue, skb);
2266 /* When only partial message is copied to the user, increase
2267 * rwnd by that amount. If all the data in the skb is read,
2268 * rwnd is updated when the event is freed.
2270 if (!sctp_ulpevent_is_notification(event))
2271 sctp_assoc_rwnd_increase(event->asoc, copied);
2273 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2274 (event->msg_flags & MSG_EOR))
2275 msg->msg_flags |= MSG_EOR;
2277 msg->msg_flags &= ~MSG_EOR;
2280 if (flags & MSG_PEEK) {
2281 /* Release the skb reference acquired after peeking the skb in
2282 * sctp_skb_recv_datagram().
2286 /* Free the event which includes releasing the reference to
2287 * the owner of the skb, freeing the skb and updating the
2290 sctp_ulpevent_free(event);
2297 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2299 * This option is a on/off flag. If enabled no SCTP message
2300 * fragmentation will be performed. Instead if a message being sent
2301 * exceeds the current PMTU size, the message will NOT be sent and
2302 * instead a error will be indicated to the user.
2304 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2305 char __user *optval,
2306 unsigned int optlen)
2310 if (optlen < sizeof(int))
2313 if (get_user(val, (int __user *)optval))
2316 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2321 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2322 unsigned int optlen)
2324 struct sctp_association *asoc;
2325 struct sctp_ulpevent *event;
2327 if (optlen > sizeof(struct sctp_event_subscribe))
2329 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2332 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2333 * if there is no data to be sent or retransmit, the stack will
2334 * immediately send up this notification.
2336 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2337 &sctp_sk(sk)->subscribe)) {
2338 asoc = sctp_id2assoc(sk, 0);
2340 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2341 event = sctp_ulpevent_make_sender_dry_event(asoc,
2342 GFP_USER | __GFP_NOWARN);
2346 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2353 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2355 * This socket option is applicable to the UDP-style socket only. When
2356 * set it will cause associations that are idle for more than the
2357 * specified number of seconds to automatically close. An association
2358 * being idle is defined an association that has NOT sent or received
2359 * user data. The special value of '0' indicates that no automatic
2360 * close of any associations should be performed. The option expects an
2361 * integer defining the number of seconds of idle time before an
2362 * association is closed.
2364 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2365 unsigned int optlen)
2367 struct sctp_sock *sp = sctp_sk(sk);
2368 struct net *net = sock_net(sk);
2370 /* Applicable to UDP-style socket only */
2371 if (sctp_style(sk, TCP))
2373 if (optlen != sizeof(int))
2375 if (copy_from_user(&sp->autoclose, optval, optlen))
2378 if (sp->autoclose > net->sctp.max_autoclose)
2379 sp->autoclose = net->sctp.max_autoclose;
2384 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2386 * Applications can enable or disable heartbeats for any peer address of
2387 * an association, modify an address's heartbeat interval, force a
2388 * heartbeat to be sent immediately, and adjust the address's maximum
2389 * number of retransmissions sent before an address is considered
2390 * unreachable. The following structure is used to access and modify an
2391 * address's parameters:
2393 * struct sctp_paddrparams {
2394 * sctp_assoc_t spp_assoc_id;
2395 * struct sockaddr_storage spp_address;
2396 * uint32_t spp_hbinterval;
2397 * uint16_t spp_pathmaxrxt;
2398 * uint32_t spp_pathmtu;
2399 * uint32_t spp_sackdelay;
2400 * uint32_t spp_flags;
2401 * uint32_t spp_ipv6_flowlabel;
2405 * spp_assoc_id - (one-to-many style socket) This is filled in the
2406 * application, and identifies the association for
2408 * spp_address - This specifies which address is of interest.
2409 * spp_hbinterval - This contains the value of the heartbeat interval,
2410 * in milliseconds. If a value of zero
2411 * is present in this field then no changes are to
2412 * be made to this parameter.
2413 * spp_pathmaxrxt - This contains the maximum number of
2414 * retransmissions before this address shall be
2415 * considered unreachable. If a value of zero
2416 * is present in this field then no changes are to
2417 * be made to this parameter.
2418 * spp_pathmtu - When Path MTU discovery is disabled the value
2419 * specified here will be the "fixed" path mtu.
2420 * Note that if the spp_address field is empty
2421 * then all associations on this address will
2422 * have this fixed path mtu set upon them.
2424 * spp_sackdelay - When delayed sack is enabled, this value specifies
2425 * the number of milliseconds that sacks will be delayed
2426 * for. This value will apply to all addresses of an
2427 * association if the spp_address field is empty. Note
2428 * also, that if delayed sack is enabled and this
2429 * value is set to 0, no change is made to the last
2430 * recorded delayed sack timer value.
2432 * spp_flags - These flags are used to control various features
2433 * on an association. The flag field may contain
2434 * zero or more of the following options.
2436 * SPP_HB_ENABLE - Enable heartbeats on the
2437 * specified address. Note that if the address
2438 * field is empty all addresses for the association
2439 * have heartbeats enabled upon them.
2441 * SPP_HB_DISABLE - Disable heartbeats on the
2442 * speicifed address. Note that if the address
2443 * field is empty all addresses for the association
2444 * will have their heartbeats disabled. Note also
2445 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2446 * mutually exclusive, only one of these two should
2447 * be specified. Enabling both fields will have
2448 * undetermined results.
2450 * SPP_HB_DEMAND - Request a user initiated heartbeat
2451 * to be made immediately.
2453 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2454 * heartbeat delayis to be set to the value of 0
2457 * SPP_PMTUD_ENABLE - This field will enable PMTU
2458 * discovery upon the specified address. Note that
2459 * if the address feild is empty then all addresses
2460 * on the association are effected.
2462 * SPP_PMTUD_DISABLE - This field will disable PMTU
2463 * discovery upon the specified address. Note that
2464 * if the address feild is empty then all addresses
2465 * on the association are effected. Not also that
2466 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2467 * exclusive. Enabling both will have undetermined
2470 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2471 * on delayed sack. The time specified in spp_sackdelay
2472 * is used to specify the sack delay for this address. Note
2473 * that if spp_address is empty then all addresses will
2474 * enable delayed sack and take on the sack delay
2475 * value specified in spp_sackdelay.
2476 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2477 * off delayed sack. If the spp_address field is blank then
2478 * delayed sack is disabled for the entire association. Note
2479 * also that this field is mutually exclusive to
2480 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2483 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2484 * setting of the IPV6 flow label value. The value is
2485 * contained in the spp_ipv6_flowlabel field.
2486 * Upon retrieval, this flag will be set to indicate that
2487 * the spp_ipv6_flowlabel field has a valid value returned.
2488 * If a specific destination address is set (in the
2489 * spp_address field), then the value returned is that of
2490 * the address. If just an association is specified (and
2491 * no address), then the association's default flow label
2492 * is returned. If neither an association nor a destination
2493 * is specified, then the socket's default flow label is
2494 * returned. For non-IPv6 sockets, this flag will be left
2497 * SPP_DSCP: Setting this flag enables the setting of the
2498 * Differentiated Services Code Point (DSCP) value
2499 * associated with either the association or a specific
2500 * address. The value is obtained in the spp_dscp field.
2501 * Upon retrieval, this flag will be set to indicate that
2502 * the spp_dscp field has a valid value returned. If a
2503 * specific destination address is set when called (in the
2504 * spp_address field), then that specific destination
2505 * address's DSCP value is returned. If just an association
2506 * is specified, then the association's default DSCP is
2507 * returned. If neither an association nor a destination is
2508 * specified, then the socket's default DSCP is returned.
2510 * spp_ipv6_flowlabel
2511 * - This field is used in conjunction with the
2512 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2513 * The 20 least significant bits are used for the flow
2514 * label. This setting has precedence over any IPv6-layer
2517 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2518 * and contains the DSCP. The 6 most significant bits are
2519 * used for the DSCP. This setting has precedence over any
2520 * IPv4- or IPv6- layer setting.
2522 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2523 struct sctp_transport *trans,
2524 struct sctp_association *asoc,
2525 struct sctp_sock *sp,
2528 int sackdelay_change)
2532 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2533 struct net *net = sock_net(trans->asoc->base.sk);
2535 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2540 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2541 * this field is ignored. Note also that a value of zero indicates
2542 * the current setting should be left unchanged.
2544 if (params->spp_flags & SPP_HB_ENABLE) {
2546 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2547 * set. This lets us use 0 value when this flag
2550 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2551 params->spp_hbinterval = 0;
2553 if (params->spp_hbinterval ||
2554 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2557 msecs_to_jiffies(params->spp_hbinterval);
2560 msecs_to_jiffies(params->spp_hbinterval);
2562 sp->hbinterval = params->spp_hbinterval;
2569 trans->param_flags =
2570 (trans->param_flags & ~SPP_HB) | hb_change;
2573 (asoc->param_flags & ~SPP_HB) | hb_change;
2576 (sp->param_flags & ~SPP_HB) | hb_change;
2580 /* When Path MTU discovery is disabled the value specified here will
2581 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2582 * include the flag SPP_PMTUD_DISABLE for this field to have any
2585 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2587 trans->pathmtu = params->spp_pathmtu;
2588 sctp_assoc_sync_pmtu(asoc);
2590 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2592 sp->pathmtu = params->spp_pathmtu;
2598 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2599 (params->spp_flags & SPP_PMTUD_ENABLE);
2600 trans->param_flags =
2601 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2603 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2604 sctp_assoc_sync_pmtu(asoc);
2608 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2611 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2615 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2616 * value of this field is ignored. Note also that a value of zero
2617 * indicates the current setting should be left unchanged.
2619 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2622 msecs_to_jiffies(params->spp_sackdelay);
2625 msecs_to_jiffies(params->spp_sackdelay);
2627 sp->sackdelay = params->spp_sackdelay;
2631 if (sackdelay_change) {
2633 trans->param_flags =
2634 (trans->param_flags & ~SPP_SACKDELAY) |
2638 (asoc->param_flags & ~SPP_SACKDELAY) |
2642 (sp->param_flags & ~SPP_SACKDELAY) |
2647 /* Note that a value of zero indicates the current setting should be
2650 if (params->spp_pathmaxrxt) {
2652 trans->pathmaxrxt = params->spp_pathmaxrxt;
2654 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2656 sp->pathmaxrxt = params->spp_pathmaxrxt;
2660 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2662 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2663 trans->flowlabel = params->spp_ipv6_flowlabel &
2664 SCTP_FLOWLABEL_VAL_MASK;
2665 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2668 struct sctp_transport *t;
2670 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2672 if (t->ipaddr.sa.sa_family != AF_INET6)
2674 t->flowlabel = params->spp_ipv6_flowlabel &
2675 SCTP_FLOWLABEL_VAL_MASK;
2676 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2678 asoc->flowlabel = params->spp_ipv6_flowlabel &
2679 SCTP_FLOWLABEL_VAL_MASK;
2680 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2681 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2682 sp->flowlabel = params->spp_ipv6_flowlabel &
2683 SCTP_FLOWLABEL_VAL_MASK;
2684 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2688 if (params->spp_flags & SPP_DSCP) {
2690 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2691 trans->dscp |= SCTP_DSCP_SET_MASK;
2693 struct sctp_transport *t;
2695 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2697 t->dscp = params->spp_dscp &
2699 t->dscp |= SCTP_DSCP_SET_MASK;
2701 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2702 asoc->dscp |= SCTP_DSCP_SET_MASK;
2704 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2705 sp->dscp |= SCTP_DSCP_SET_MASK;
2712 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2713 char __user *optval,
2714 unsigned int optlen)
2716 struct sctp_paddrparams params;
2717 struct sctp_transport *trans = NULL;
2718 struct sctp_association *asoc = NULL;
2719 struct sctp_sock *sp = sctp_sk(sk);
2721 int hb_change, pmtud_change, sackdelay_change;
2723 if (optlen == sizeof(params)) {
2724 if (copy_from_user(¶ms, optval, optlen))
2726 } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2727 spp_ipv6_flowlabel), 4)) {
2728 if (copy_from_user(¶ms, optval, optlen))
2730 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2736 /* Validate flags and value parameters. */
2737 hb_change = params.spp_flags & SPP_HB;
2738 pmtud_change = params.spp_flags & SPP_PMTUD;
2739 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2741 if (hb_change == SPP_HB ||
2742 pmtud_change == SPP_PMTUD ||
2743 sackdelay_change == SPP_SACKDELAY ||
2744 params.spp_sackdelay > 500 ||
2745 (params.spp_pathmtu &&
2746 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2749 /* If an address other than INADDR_ANY is specified, and
2750 * no transport is found, then the request is invalid.
2752 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2753 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2754 params.spp_assoc_id);
2759 /* Get association, if assoc_id != 0 and the socket is a one
2760 * to many style socket, and an association was not found, then
2761 * the id was invalid.
2763 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2764 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2767 /* Heartbeat demand can only be sent on a transport or
2768 * association, but not a socket.
2770 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2773 /* Process parameters. */
2774 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2775 hb_change, pmtud_change,
2781 /* If changes are for association, also apply parameters to each
2784 if (!trans && asoc) {
2785 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2787 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2788 hb_change, pmtud_change,
2796 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2798 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2801 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2803 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2807 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2809 * This option will effect the way delayed acks are performed. This
2810 * option allows you to get or set the delayed ack time, in
2811 * milliseconds. It also allows changing the delayed ack frequency.
2812 * Changing the frequency to 1 disables the delayed sack algorithm. If
2813 * the assoc_id is 0, then this sets or gets the endpoints default
2814 * values. If the assoc_id field is non-zero, then the set or get
2815 * effects the specified association for the one to many model (the
2816 * assoc_id field is ignored by the one to one model). Note that if
2817 * sack_delay or sack_freq are 0 when setting this option, then the
2818 * current values will remain unchanged.
2820 * struct sctp_sack_info {
2821 * sctp_assoc_t sack_assoc_id;
2822 * uint32_t sack_delay;
2823 * uint32_t sack_freq;
2826 * sack_assoc_id - This parameter, indicates which association the user
2827 * is performing an action upon. Note that if this field's value is
2828 * zero then the endpoints default value is changed (effecting future
2829 * associations only).
2831 * sack_delay - This parameter contains the number of milliseconds that
2832 * the user is requesting the delayed ACK timer be set to. Note that
2833 * this value is defined in the standard to be between 200 and 500
2836 * sack_freq - This parameter contains the number of packets that must
2837 * be received before a sack is sent without waiting for the delay
2838 * timer to expire. The default value for this is 2, setting this
2839 * value to 1 will disable the delayed sack algorithm.
2842 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2843 char __user *optval, unsigned int optlen)
2845 struct sctp_sack_info params;
2846 struct sctp_transport *trans = NULL;
2847 struct sctp_association *asoc = NULL;
2848 struct sctp_sock *sp = sctp_sk(sk);
2850 if (optlen == sizeof(struct sctp_sack_info)) {
2851 if (copy_from_user(¶ms, optval, optlen))
2854 if (params.sack_delay == 0 && params.sack_freq == 0)
2856 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2857 pr_warn_ratelimited(DEPRECATED
2859 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2860 "Use struct sctp_sack_info instead\n",
2861 current->comm, task_pid_nr(current));
2862 if (copy_from_user(¶ms, optval, optlen))
2865 if (params.sack_delay == 0)
2866 params.sack_freq = 1;
2868 params.sack_freq = 0;
2872 /* Validate value parameter. */
2873 if (params.sack_delay > 500)
2876 /* Get association, if sack_assoc_id != 0 and the socket is a one
2877 * to many style socket, and an association was not found, then
2878 * the id was invalid.
2880 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2881 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2884 if (params.sack_delay) {
2887 msecs_to_jiffies(params.sack_delay);
2889 sctp_spp_sackdelay_enable(asoc->param_flags);
2891 sp->sackdelay = params.sack_delay;
2893 sctp_spp_sackdelay_enable(sp->param_flags);
2897 if (params.sack_freq == 1) {
2900 sctp_spp_sackdelay_disable(asoc->param_flags);
2903 sctp_spp_sackdelay_disable(sp->param_flags);
2905 } else if (params.sack_freq > 1) {
2907 asoc->sackfreq = params.sack_freq;
2909 sctp_spp_sackdelay_enable(asoc->param_flags);
2911 sp->sackfreq = params.sack_freq;
2913 sctp_spp_sackdelay_enable(sp->param_flags);
2917 /* If change is for association, also apply to each transport. */
2919 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2921 if (params.sack_delay) {
2923 msecs_to_jiffies(params.sack_delay);
2924 trans->param_flags =
2925 sctp_spp_sackdelay_enable(trans->param_flags);
2927 if (params.sack_freq == 1) {
2928 trans->param_flags =
2929 sctp_spp_sackdelay_disable(trans->param_flags);
2930 } else if (params.sack_freq > 1) {
2931 trans->sackfreq = params.sack_freq;
2932 trans->param_flags =
2933 sctp_spp_sackdelay_enable(trans->param_flags);
2941 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2943 * Applications can specify protocol parameters for the default association
2944 * initialization. The option name argument to setsockopt() and getsockopt()
2947 * Setting initialization parameters is effective only on an unconnected
2948 * socket (for UDP-style sockets only future associations are effected
2949 * by the change). With TCP-style sockets, this option is inherited by
2950 * sockets derived from a listener socket.
2952 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2954 struct sctp_initmsg sinit;
2955 struct sctp_sock *sp = sctp_sk(sk);
2957 if (optlen != sizeof(struct sctp_initmsg))
2959 if (copy_from_user(&sinit, optval, optlen))
2962 if (sinit.sinit_num_ostreams)
2963 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2964 if (sinit.sinit_max_instreams)
2965 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2966 if (sinit.sinit_max_attempts)
2967 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2968 if (sinit.sinit_max_init_timeo)
2969 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2975 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2977 * Applications that wish to use the sendto() system call may wish to
2978 * specify a default set of parameters that would normally be supplied
2979 * through the inclusion of ancillary data. This socket option allows
2980 * such an application to set the default sctp_sndrcvinfo structure.
2981 * The application that wishes to use this socket option simply passes
2982 * in to this call the sctp_sndrcvinfo structure defined in Section
2983 * 5.2.2) The input parameters accepted by this call include
2984 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2985 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2986 * to this call if the caller is using the UDP model.
2988 static int sctp_setsockopt_default_send_param(struct sock *sk,
2989 char __user *optval,
2990 unsigned int optlen)
2992 struct sctp_sock *sp = sctp_sk(sk);
2993 struct sctp_association *asoc;
2994 struct sctp_sndrcvinfo info;
2996 if (optlen != sizeof(info))
2998 if (copy_from_user(&info, optval, optlen))
3000 if (info.sinfo_flags &
3001 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3002 SCTP_ABORT | SCTP_EOF))
3005 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
3006 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
3009 asoc->default_stream = info.sinfo_stream;
3010 asoc->default_flags = info.sinfo_flags;
3011 asoc->default_ppid = info.sinfo_ppid;
3012 asoc->default_context = info.sinfo_context;
3013 asoc->default_timetolive = info.sinfo_timetolive;
3015 sp->default_stream = info.sinfo_stream;
3016 sp->default_flags = info.sinfo_flags;
3017 sp->default_ppid = info.sinfo_ppid;
3018 sp->default_context = info.sinfo_context;
3019 sp->default_timetolive = info.sinfo_timetolive;
3025 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
3026 * (SCTP_DEFAULT_SNDINFO)
3028 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
3029 char __user *optval,
3030 unsigned int optlen)
3032 struct sctp_sock *sp = sctp_sk(sk);
3033 struct sctp_association *asoc;
3034 struct sctp_sndinfo info;
3036 if (optlen != sizeof(info))
3038 if (copy_from_user(&info, optval, optlen))
3040 if (info.snd_flags &
3041 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3042 SCTP_ABORT | SCTP_EOF))
3045 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
3046 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
3049 asoc->default_stream = info.snd_sid;
3050 asoc->default_flags = info.snd_flags;
3051 asoc->default_ppid = info.snd_ppid;
3052 asoc->default_context = info.snd_context;
3054 sp->default_stream = info.snd_sid;
3055 sp->default_flags = info.snd_flags;
3056 sp->default_ppid = info.snd_ppid;
3057 sp->default_context = info.snd_context;
3063 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3065 * Requests that the local SCTP stack use the enclosed peer address as
3066 * the association primary. The enclosed address must be one of the
3067 * association peer's addresses.
3069 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3070 unsigned int optlen)
3072 struct sctp_prim prim;
3073 struct sctp_transport *trans;
3077 if (optlen != sizeof(struct sctp_prim))
3080 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3083 /* Allow security module to validate address but need address len. */
3084 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3088 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3089 (struct sockaddr *)&prim.ssp_addr,
3094 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3098 sctp_assoc_set_primary(trans->asoc, trans);
3104 * 7.1.5 SCTP_NODELAY
3106 * Turn on/off any Nagle-like algorithm. This means that packets are
3107 * generally sent as soon as possible and no unnecessary delays are
3108 * introduced, at the cost of more packets in the network. Expects an
3109 * integer boolean flag.
3111 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3112 unsigned int optlen)
3116 if (optlen < sizeof(int))
3118 if (get_user(val, (int __user *)optval))
3121 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3127 * 7.1.1 SCTP_RTOINFO
3129 * The protocol parameters used to initialize and bound retransmission
3130 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3131 * and modify these parameters.
3132 * All parameters are time values, in milliseconds. A value of 0, when
3133 * modifying the parameters, indicates that the current value should not
3137 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3139 struct sctp_rtoinfo rtoinfo;
3140 struct sctp_association *asoc;
3141 unsigned long rto_min, rto_max;
3142 struct sctp_sock *sp = sctp_sk(sk);
3144 if (optlen != sizeof (struct sctp_rtoinfo))
3147 if (copy_from_user(&rtoinfo, optval, optlen))
3150 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3152 /* Set the values to the specific association */
3153 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
3156 rto_max = rtoinfo.srto_max;
3157 rto_min = rtoinfo.srto_min;
3160 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3162 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3165 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3167 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3169 if (rto_min > rto_max)
3173 if (rtoinfo.srto_initial != 0)
3175 msecs_to_jiffies(rtoinfo.srto_initial);
3176 asoc->rto_max = rto_max;
3177 asoc->rto_min = rto_min;
3179 /* If there is no association or the association-id = 0
3180 * set the values to the endpoint.
3182 if (rtoinfo.srto_initial != 0)
3183 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3184 sp->rtoinfo.srto_max = rto_max;
3185 sp->rtoinfo.srto_min = rto_min;
3193 * 7.1.2 SCTP_ASSOCINFO
3195 * This option is used to tune the maximum retransmission attempts
3196 * of the association.
3197 * Returns an error if the new association retransmission value is
3198 * greater than the sum of the retransmission value of the peer.
3199 * See [SCTP] for more information.
3202 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3205 struct sctp_assocparams assocparams;
3206 struct sctp_association *asoc;
3208 if (optlen != sizeof(struct sctp_assocparams))
3210 if (copy_from_user(&assocparams, optval, optlen))
3213 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3215 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3218 /* Set the values to the specific association */
3220 if (assocparams.sasoc_asocmaxrxt != 0) {
3223 struct sctp_transport *peer_addr;
3225 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3227 path_sum += peer_addr->pathmaxrxt;
3231 /* Only validate asocmaxrxt if we have more than
3232 * one path/transport. We do this because path
3233 * retransmissions are only counted when we have more
3237 assocparams.sasoc_asocmaxrxt > path_sum)
3240 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3243 if (assocparams.sasoc_cookie_life != 0)
3244 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3246 /* Set the values to the endpoint */
3247 struct sctp_sock *sp = sctp_sk(sk);
3249 if (assocparams.sasoc_asocmaxrxt != 0)
3250 sp->assocparams.sasoc_asocmaxrxt =
3251 assocparams.sasoc_asocmaxrxt;
3252 if (assocparams.sasoc_cookie_life != 0)
3253 sp->assocparams.sasoc_cookie_life =
3254 assocparams.sasoc_cookie_life;
3260 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3262 * This socket option is a boolean flag which turns on or off mapped V4
3263 * addresses. If this option is turned on and the socket is type
3264 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3265 * If this option is turned off, then no mapping will be done of V4
3266 * addresses and a user will receive both PF_INET6 and PF_INET type
3267 * addresses on the socket.
3269 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3272 struct sctp_sock *sp = sctp_sk(sk);
3274 if (optlen < sizeof(int))
3276 if (get_user(val, (int __user *)optval))
3287 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3288 * This option will get or set the maximum size to put in any outgoing
3289 * SCTP DATA chunk. If a message is larger than this size it will be
3290 * fragmented by SCTP into the specified size. Note that the underlying
3291 * SCTP implementation may fragment into smaller sized chunks when the
3292 * PMTU of the underlying association is smaller than the value set by
3293 * the user. The default value for this option is '0' which indicates
3294 * the user is NOT limiting fragmentation and only the PMTU will effect
3295 * SCTP's choice of DATA chunk size. Note also that values set larger
3296 * than the maximum size of an IP datagram will effectively let SCTP
3297 * control fragmentation (i.e. the same as setting this option to 0).
3299 * The following structure is used to access and modify this parameter:
3301 * struct sctp_assoc_value {
3302 * sctp_assoc_t assoc_id;
3303 * uint32_t assoc_value;
3306 * assoc_id: This parameter is ignored for one-to-one style sockets.
3307 * For one-to-many style sockets this parameter indicates which
3308 * association the user is performing an action upon. Note that if
3309 * this field's value is zero then the endpoints default value is
3310 * changed (effecting future associations only).
3311 * assoc_value: This parameter specifies the maximum size in bytes.
3313 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3315 struct sctp_sock *sp = sctp_sk(sk);
3316 struct sctp_assoc_value params;
3317 struct sctp_association *asoc;
3320 if (optlen == sizeof(int)) {
3321 pr_warn_ratelimited(DEPRECATED
3323 "Use of int in maxseg socket option.\n"
3324 "Use struct sctp_assoc_value instead\n",
3325 current->comm, task_pid_nr(current));
3326 if (copy_from_user(&val, optval, optlen))
3328 params.assoc_id = 0;
3329 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3330 if (copy_from_user(¶ms, optval, optlen))
3332 val = params.assoc_value;
3337 asoc = sctp_id2assoc(sk, params.assoc_id);
3340 int min_len, max_len;
3341 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3342 sizeof(struct sctp_data_chunk);
3344 min_len = sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT,
3346 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3348 if (val < min_len || val > max_len)
3353 asoc->user_frag = val;
3354 sctp_assoc_update_frag_point(asoc);
3356 if (params.assoc_id && sctp_style(sk, UDP))
3358 sp->user_frag = val;
3366 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3368 * Requests that the peer mark the enclosed address as the association
3369 * primary. The enclosed address must be one of the association's
3370 * locally bound addresses. The following structure is used to make a
3371 * set primary request:
3373 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3374 unsigned int optlen)
3376 struct net *net = sock_net(sk);
3377 struct sctp_sock *sp;
3378 struct sctp_association *asoc = NULL;
3379 struct sctp_setpeerprim prim;
3380 struct sctp_chunk *chunk;
3386 if (!net->sctp.addip_enable)
3389 if (optlen != sizeof(struct sctp_setpeerprim))
3392 if (copy_from_user(&prim, optval, optlen))
3395 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3399 if (!asoc->peer.asconf_capable)
3402 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3405 if (!sctp_state(asoc, ESTABLISHED))
3408 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3412 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3413 return -EADDRNOTAVAIL;
3415 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3416 return -EADDRNOTAVAIL;
3418 /* Allow security module to validate address. */
3419 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3420 (struct sockaddr *)&prim.sspp_addr,
3425 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3426 chunk = sctp_make_asconf_set_prim(asoc,
3427 (union sctp_addr *)&prim.sspp_addr);
3431 err = sctp_send_asconf(asoc, chunk);
3433 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3438 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3439 unsigned int optlen)
3441 struct sctp_setadaptation adaptation;
3443 if (optlen != sizeof(struct sctp_setadaptation))
3445 if (copy_from_user(&adaptation, optval, optlen))
3448 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3454 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3456 * The context field in the sctp_sndrcvinfo structure is normally only
3457 * used when a failed message is retrieved holding the value that was
3458 * sent down on the actual send call. This option allows the setting of
3459 * a default context on an association basis that will be received on
3460 * reading messages from the peer. This is especially helpful in the
3461 * one-2-many model for an application to keep some reference to an
3462 * internal state machine that is processing messages on the
3463 * association. Note that the setting of this value only effects
3464 * received messages from the peer and does not effect the value that is
3465 * saved with outbound messages.
3467 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3468 unsigned int optlen)
3470 struct sctp_assoc_value params;
3471 struct sctp_sock *sp;
3472 struct sctp_association *asoc;
3474 if (optlen != sizeof(struct sctp_assoc_value))
3476 if (copy_from_user(¶ms, optval, optlen))
3481 if (params.assoc_id != 0) {
3482 asoc = sctp_id2assoc(sk, params.assoc_id);
3485 asoc->default_rcv_context = params.assoc_value;
3487 sp->default_rcv_context = params.assoc_value;
3494 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3496 * This options will at a minimum specify if the implementation is doing
3497 * fragmented interleave. Fragmented interleave, for a one to many
3498 * socket, is when subsequent calls to receive a message may return
3499 * parts of messages from different associations. Some implementations
3500 * may allow you to turn this value on or off. If so, when turned off,
3501 * no fragment interleave will occur (which will cause a head of line
3502 * blocking amongst multiple associations sharing the same one to many
3503 * socket). When this option is turned on, then each receive call may
3504 * come from a different association (thus the user must receive data
3505 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3506 * association each receive belongs to.
3508 * This option takes a boolean value. A non-zero value indicates that
3509 * fragmented interleave is on. A value of zero indicates that
3510 * fragmented interleave is off.
3512 * Note that it is important that an implementation that allows this
3513 * option to be turned on, have it off by default. Otherwise an unaware
3514 * application using the one to many model may become confused and act
3517 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3518 char __user *optval,
3519 unsigned int optlen)
3523 if (optlen != sizeof(int))
3525 if (get_user(val, (int __user *)optval))
3528 sctp_sk(sk)->frag_interleave = !!val;
3530 if (!sctp_sk(sk)->frag_interleave)
3531 sctp_sk(sk)->strm_interleave = 0;
3537 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3538 * (SCTP_PARTIAL_DELIVERY_POINT)
3540 * This option will set or get the SCTP partial delivery point. This
3541 * point is the size of a message where the partial delivery API will be
3542 * invoked to help free up rwnd space for the peer. Setting this to a
3543 * lower value will cause partial deliveries to happen more often. The
3544 * calls argument is an integer that sets or gets the partial delivery
3545 * point. Note also that the call will fail if the user attempts to set
3546 * this value larger than the socket receive buffer size.
3548 * Note that any single message having a length smaller than or equal to
3549 * the SCTP partial delivery point will be delivered in one single read
3550 * call as long as the user provided buffer is large enough to hold the
3553 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3554 char __user *optval,
3555 unsigned int optlen)
3559 if (optlen != sizeof(u32))
3561 if (get_user(val, (int __user *)optval))
3564 /* Note: We double the receive buffer from what the user sets
3565 * it to be, also initial rwnd is based on rcvbuf/2.
3567 if (val > (sk->sk_rcvbuf >> 1))
3570 sctp_sk(sk)->pd_point = val;
3572 return 0; /* is this the right error code? */
3576 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3578 * This option will allow a user to change the maximum burst of packets
3579 * that can be emitted by this association. Note that the default value
3580 * is 4, and some implementations may restrict this setting so that it
3581 * can only be lowered.
3583 * NOTE: This text doesn't seem right. Do this on a socket basis with
3584 * future associations inheriting the socket value.
3586 static int sctp_setsockopt_maxburst(struct sock *sk,
3587 char __user *optval,
3588 unsigned int optlen)
3590 struct sctp_assoc_value params;
3591 struct sctp_sock *sp;
3592 struct sctp_association *asoc;
3596 if (optlen == sizeof(int)) {
3597 pr_warn_ratelimited(DEPRECATED
3599 "Use of int in max_burst socket option deprecated.\n"
3600 "Use struct sctp_assoc_value instead\n",
3601 current->comm, task_pid_nr(current));
3602 if (copy_from_user(&val, optval, optlen))
3604 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3605 if (copy_from_user(¶ms, optval, optlen))
3607 val = params.assoc_value;
3608 assoc_id = params.assoc_id;
3614 if (assoc_id != 0) {
3615 asoc = sctp_id2assoc(sk, assoc_id);
3618 asoc->max_burst = val;
3620 sp->max_burst = val;
3626 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3628 * This set option adds a chunk type that the user is requesting to be
3629 * received only in an authenticated way. Changes to the list of chunks
3630 * will only effect future associations on the socket.
3632 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3633 char __user *optval,
3634 unsigned int optlen)
3636 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3637 struct sctp_authchunk val;
3639 if (!ep->auth_enable)
3642 if (optlen != sizeof(struct sctp_authchunk))
3644 if (copy_from_user(&val, optval, optlen))
3647 switch (val.sauth_chunk) {
3649 case SCTP_CID_INIT_ACK:
3650 case SCTP_CID_SHUTDOWN_COMPLETE:
3655 /* add this chunk id to the endpoint */
3656 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3660 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3662 * This option gets or sets the list of HMAC algorithms that the local
3663 * endpoint requires the peer to use.
3665 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3666 char __user *optval,
3667 unsigned int optlen)
3669 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3670 struct sctp_hmacalgo *hmacs;
3674 if (!ep->auth_enable)
3677 if (optlen < sizeof(struct sctp_hmacalgo))
3679 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3680 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3682 hmacs = memdup_user(optval, optlen);
3684 return PTR_ERR(hmacs);
3686 idents = hmacs->shmac_num_idents;
3687 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3688 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3693 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3700 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3702 * This option will set a shared secret key which is used to build an
3703 * association shared key.
3705 static int sctp_setsockopt_auth_key(struct sock *sk,
3706 char __user *optval,
3707 unsigned int optlen)
3709 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3710 struct sctp_authkey *authkey;
3711 struct sctp_association *asoc;
3714 if (!ep->auth_enable)
3717 if (optlen <= sizeof(struct sctp_authkey))
3719 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3722 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3723 sizeof(struct sctp_authkey));
3725 authkey = memdup_user(optval, optlen);
3726 if (IS_ERR(authkey))
3727 return PTR_ERR(authkey);
3729 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3734 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3735 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3740 ret = sctp_auth_set_key(ep, asoc, authkey);
3747 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3749 * This option will get or set the active shared key to be used to build
3750 * the association shared key.
3752 static int sctp_setsockopt_active_key(struct sock *sk,
3753 char __user *optval,
3754 unsigned int optlen)
3756 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3757 struct sctp_authkeyid val;
3758 struct sctp_association *asoc;
3760 if (!ep->auth_enable)
3763 if (optlen != sizeof(struct sctp_authkeyid))
3765 if (copy_from_user(&val, optval, optlen))
3768 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3769 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3772 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3776 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3778 * This set option will delete a shared secret key from use.
3780 static int sctp_setsockopt_del_key(struct sock *sk,
3781 char __user *optval,
3782 unsigned int optlen)
3784 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3785 struct sctp_authkeyid val;
3786 struct sctp_association *asoc;
3788 if (!ep->auth_enable)
3791 if (optlen != sizeof(struct sctp_authkeyid))
3793 if (copy_from_user(&val, optval, optlen))
3796 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3797 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3800 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3805 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3807 * This set option will deactivate a shared secret key.
3809 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3810 unsigned int optlen)
3812 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3813 struct sctp_authkeyid val;
3814 struct sctp_association *asoc;
3816 if (!ep->auth_enable)
3819 if (optlen != sizeof(struct sctp_authkeyid))
3821 if (copy_from_user(&val, optval, optlen))
3824 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3825 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3828 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3832 * 8.1.23 SCTP_AUTO_ASCONF
3834 * This option will enable or disable the use of the automatic generation of
3835 * ASCONF chunks to add and delete addresses to an existing association. Note
3836 * that this option has two caveats namely: a) it only affects sockets that
3837 * are bound to all addresses available to the SCTP stack, and b) the system
3838 * administrator may have an overriding control that turns the ASCONF feature
3839 * off no matter what setting the socket option may have.
3840 * This option expects an integer boolean flag, where a non-zero value turns on
3841 * the option, and a zero value turns off the option.
3842 * Note. In this implementation, socket operation overrides default parameter
3843 * being set by sysctl as well as FreeBSD implementation
3845 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3846 unsigned int optlen)
3849 struct sctp_sock *sp = sctp_sk(sk);
3851 if (optlen < sizeof(int))
3853 if (get_user(val, (int __user *)optval))
3855 if (!sctp_is_ep_boundall(sk) && val)
3857 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3860 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3861 if (val == 0 && sp->do_auto_asconf) {
3862 list_del(&sp->auto_asconf_list);
3863 sp->do_auto_asconf = 0;
3864 } else if (val && !sp->do_auto_asconf) {
3865 list_add_tail(&sp->auto_asconf_list,
3866 &sock_net(sk)->sctp.auto_asconf_splist);
3867 sp->do_auto_asconf = 1;
3869 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3874 * SCTP_PEER_ADDR_THLDS
3876 * This option allows us to alter the partially failed threshold for one or all
3877 * transports in an association. See Section 6.1 of:
3878 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3880 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3881 char __user *optval,
3882 unsigned int optlen)
3884 struct sctp_paddrthlds val;
3885 struct sctp_transport *trans;
3886 struct sctp_association *asoc;
3888 if (optlen < sizeof(struct sctp_paddrthlds))
3890 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3891 sizeof(struct sctp_paddrthlds)))
3895 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3896 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3899 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3901 if (val.spt_pathmaxrxt)
3902 trans->pathmaxrxt = val.spt_pathmaxrxt;
3903 trans->pf_retrans = val.spt_pathpfthld;
3906 if (val.spt_pathmaxrxt)
3907 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3908 asoc->pf_retrans = val.spt_pathpfthld;
3910 trans = sctp_addr_id2transport(sk, &val.spt_address,
3915 if (val.spt_pathmaxrxt)
3916 trans->pathmaxrxt = val.spt_pathmaxrxt;
3917 trans->pf_retrans = val.spt_pathpfthld;
3923 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3924 char __user *optval,
3925 unsigned int optlen)
3929 if (optlen < sizeof(int))
3931 if (get_user(val, (int __user *) optval))
3934 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3939 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3940 char __user *optval,
3941 unsigned int optlen)
3945 if (optlen < sizeof(int))
3947 if (get_user(val, (int __user *) optval))
3950 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3955 static int sctp_setsockopt_pr_supported(struct sock *sk,
3956 char __user *optval,
3957 unsigned int optlen)
3959 struct sctp_assoc_value params;
3960 struct sctp_association *asoc;
3961 int retval = -EINVAL;
3963 if (optlen != sizeof(params))
3966 if (copy_from_user(¶ms, optval, optlen)) {
3971 asoc = sctp_id2assoc(sk, params.assoc_id);
3973 asoc->prsctp_enable = !!params.assoc_value;
3974 } else if (!params.assoc_id) {
3975 struct sctp_sock *sp = sctp_sk(sk);
3977 sp->ep->prsctp_enable = !!params.assoc_value;
3988 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3989 char __user *optval,
3990 unsigned int optlen)
3992 struct sctp_default_prinfo info;
3993 struct sctp_association *asoc;
3994 int retval = -EINVAL;
3996 if (optlen != sizeof(info))
3999 if (copy_from_user(&info, optval, sizeof(info))) {
4004 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4007 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4010 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4012 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4013 asoc->default_timetolive = info.pr_value;
4014 } else if (!info.pr_assoc_id) {
4015 struct sctp_sock *sp = sctp_sk(sk);
4017 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4018 sp->default_timetolive = info.pr_value;
4029 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4030 char __user *optval,
4031 unsigned int optlen)
4033 struct sctp_assoc_value params;
4034 struct sctp_association *asoc;
4035 int retval = -EINVAL;
4037 if (optlen != sizeof(params))
4040 if (copy_from_user(¶ms, optval, optlen)) {
4045 asoc = sctp_id2assoc(sk, params.assoc_id);
4047 asoc->reconf_enable = !!params.assoc_value;
4048 } else if (!params.assoc_id) {
4049 struct sctp_sock *sp = sctp_sk(sk);
4051 sp->ep->reconf_enable = !!params.assoc_value;
4062 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4063 char __user *optval,
4064 unsigned int optlen)
4066 struct sctp_assoc_value params;
4067 struct sctp_association *asoc;
4068 int retval = -EINVAL;
4070 if (optlen != sizeof(params))
4073 if (copy_from_user(¶ms, optval, optlen)) {
4078 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4081 asoc = sctp_id2assoc(sk, params.assoc_id);
4083 asoc->strreset_enable = params.assoc_value;
4084 } else if (!params.assoc_id) {
4085 struct sctp_sock *sp = sctp_sk(sk);
4087 sp->ep->strreset_enable = params.assoc_value;
4098 static int sctp_setsockopt_reset_streams(struct sock *sk,
4099 char __user *optval,
4100 unsigned int optlen)
4102 struct sctp_reset_streams *params;
4103 struct sctp_association *asoc;
4104 int retval = -EINVAL;
4106 if (optlen < sizeof(*params))
4108 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4109 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4110 sizeof(__u16) * sizeof(*params));
4112 params = memdup_user(optval, optlen);
4114 return PTR_ERR(params);
4116 if (params->srs_number_streams * sizeof(__u16) >
4117 optlen - sizeof(*params))
4120 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4124 retval = sctp_send_reset_streams(asoc, params);
4131 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4132 char __user *optval,
4133 unsigned int optlen)
4135 struct sctp_association *asoc;
4136 sctp_assoc_t associd;
4137 int retval = -EINVAL;
4139 if (optlen != sizeof(associd))
4142 if (copy_from_user(&associd, optval, optlen)) {
4147 asoc = sctp_id2assoc(sk, associd);
4151 retval = sctp_send_reset_assoc(asoc);
4157 static int sctp_setsockopt_add_streams(struct sock *sk,
4158 char __user *optval,
4159 unsigned int optlen)
4161 struct sctp_association *asoc;
4162 struct sctp_add_streams params;
4163 int retval = -EINVAL;
4165 if (optlen != sizeof(params))
4168 if (copy_from_user(¶ms, optval, optlen)) {
4173 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4177 retval = sctp_send_add_streams(asoc, ¶ms);
4183 static int sctp_setsockopt_scheduler(struct sock *sk,
4184 char __user *optval,
4185 unsigned int optlen)
4187 struct sctp_association *asoc;
4188 struct sctp_assoc_value params;
4189 int retval = -EINVAL;
4191 if (optlen < sizeof(params))
4194 optlen = sizeof(params);
4195 if (copy_from_user(¶ms, optval, optlen)) {
4200 if (params.assoc_value > SCTP_SS_MAX)
4203 asoc = sctp_id2assoc(sk, params.assoc_id);
4207 retval = sctp_sched_set_sched(asoc, params.assoc_value);
4213 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4214 char __user *optval,
4215 unsigned int optlen)
4217 struct sctp_association *asoc;
4218 struct sctp_stream_value params;
4219 int retval = -EINVAL;
4221 if (optlen < sizeof(params))
4224 optlen = sizeof(params);
4225 if (copy_from_user(¶ms, optval, optlen)) {
4230 asoc = sctp_id2assoc(sk, params.assoc_id);
4234 retval = sctp_sched_set_value(asoc, params.stream_id,
4235 params.stream_value, GFP_KERNEL);
4241 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4242 char __user *optval,
4243 unsigned int optlen)
4245 struct sctp_sock *sp = sctp_sk(sk);
4246 struct net *net = sock_net(sk);
4247 struct sctp_assoc_value params;
4248 int retval = -EINVAL;
4250 if (optlen < sizeof(params))
4253 optlen = sizeof(params);
4254 if (copy_from_user(¶ms, optval, optlen)) {
4259 if (params.assoc_id)
4262 if (!net->sctp.intl_enable || !sp->frag_interleave) {
4267 sp->strm_interleave = !!params.assoc_value;
4275 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4276 unsigned int optlen)
4280 if (!sctp_style(sk, TCP))
4283 if (sctp_sk(sk)->ep->base.bind_addr.port)
4286 if (optlen < sizeof(int))
4289 if (get_user(val, (int __user *)optval))
4292 sctp_sk(sk)->reuse = !!val;
4297 /* API 6.2 setsockopt(), getsockopt()
4299 * Applications use setsockopt() and getsockopt() to set or retrieve
4300 * socket options. Socket options are used to change the default
4301 * behavior of sockets calls. They are described in Section 7.
4305 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4306 * int __user *optlen);
4307 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4310 * sd - the socket descript.
4311 * level - set to IPPROTO_SCTP for all SCTP options.
4312 * optname - the option name.
4313 * optval - the buffer to store the value of the option.
4314 * optlen - the size of the buffer.
4316 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4317 char __user *optval, unsigned int optlen)
4321 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4323 /* I can hardly begin to describe how wrong this is. This is
4324 * so broken as to be worse than useless. The API draft
4325 * REALLY is NOT helpful here... I am not convinced that the
4326 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4327 * are at all well-founded.
4329 if (level != SOL_SCTP) {
4330 struct sctp_af *af = sctp_sk(sk)->pf->af;
4331 retval = af->setsockopt(sk, level, optname, optval, optlen);
4338 case SCTP_SOCKOPT_BINDX_ADD:
4339 /* 'optlen' is the size of the addresses buffer. */
4340 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4341 optlen, SCTP_BINDX_ADD_ADDR);
4344 case SCTP_SOCKOPT_BINDX_REM:
4345 /* 'optlen' is the size of the addresses buffer. */
4346 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4347 optlen, SCTP_BINDX_REM_ADDR);
4350 case SCTP_SOCKOPT_CONNECTX_OLD:
4351 /* 'optlen' is the size of the addresses buffer. */
4352 retval = sctp_setsockopt_connectx_old(sk,
4353 (struct sockaddr __user *)optval,
4357 case SCTP_SOCKOPT_CONNECTX:
4358 /* 'optlen' is the size of the addresses buffer. */
4359 retval = sctp_setsockopt_connectx(sk,
4360 (struct sockaddr __user *)optval,
4364 case SCTP_DISABLE_FRAGMENTS:
4365 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4369 retval = sctp_setsockopt_events(sk, optval, optlen);
4372 case SCTP_AUTOCLOSE:
4373 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4376 case SCTP_PEER_ADDR_PARAMS:
4377 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4380 case SCTP_DELAYED_SACK:
4381 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4383 case SCTP_PARTIAL_DELIVERY_POINT:
4384 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4388 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4390 case SCTP_DEFAULT_SEND_PARAM:
4391 retval = sctp_setsockopt_default_send_param(sk, optval,
4394 case SCTP_DEFAULT_SNDINFO:
4395 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4397 case SCTP_PRIMARY_ADDR:
4398 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4400 case SCTP_SET_PEER_PRIMARY_ADDR:
4401 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4404 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4407 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4409 case SCTP_ASSOCINFO:
4410 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4412 case SCTP_I_WANT_MAPPED_V4_ADDR:
4413 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4416 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4418 case SCTP_ADAPTATION_LAYER:
4419 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4422 retval = sctp_setsockopt_context(sk, optval, optlen);
4424 case SCTP_FRAGMENT_INTERLEAVE:
4425 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4427 case SCTP_MAX_BURST:
4428 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4430 case SCTP_AUTH_CHUNK:
4431 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4433 case SCTP_HMAC_IDENT:
4434 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4437 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4439 case SCTP_AUTH_ACTIVE_KEY:
4440 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4442 case SCTP_AUTH_DELETE_KEY:
4443 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4445 case SCTP_AUTH_DEACTIVATE_KEY:
4446 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4448 case SCTP_AUTO_ASCONF:
4449 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4451 case SCTP_PEER_ADDR_THLDS:
4452 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4454 case SCTP_RECVRCVINFO:
4455 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4457 case SCTP_RECVNXTINFO:
4458 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4460 case SCTP_PR_SUPPORTED:
4461 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4463 case SCTP_DEFAULT_PRINFO:
4464 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4466 case SCTP_RECONFIG_SUPPORTED:
4467 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4469 case SCTP_ENABLE_STREAM_RESET:
4470 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4472 case SCTP_RESET_STREAMS:
4473 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4475 case SCTP_RESET_ASSOC:
4476 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4478 case SCTP_ADD_STREAMS:
4479 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4481 case SCTP_STREAM_SCHEDULER:
4482 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4484 case SCTP_STREAM_SCHEDULER_VALUE:
4485 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4487 case SCTP_INTERLEAVING_SUPPORTED:
4488 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4491 case SCTP_REUSE_PORT:
4492 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4495 retval = -ENOPROTOOPT;
4505 /* API 3.1.6 connect() - UDP Style Syntax
4507 * An application may use the connect() call in the UDP model to initiate an
4508 * association without sending data.
4512 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4514 * sd: the socket descriptor to have a new association added to.
4516 * nam: the address structure (either struct sockaddr_in or struct
4517 * sockaddr_in6 defined in RFC2553 [7]).
4519 * len: the size of the address.
4521 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4522 int addr_len, int flags)
4524 struct inet_sock *inet = inet_sk(sk);
4530 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4533 /* We may need to bind the socket. */
4534 if (!inet->inet_num) {
4535 if (sk->sk_prot->get_port(sk, 0)) {
4539 inet->inet_sport = htons(inet->inet_num);
4542 /* Validate addr_len before calling common connect/connectx routine. */
4543 af = sctp_get_af_specific(addr->sa_family);
4544 if (!af || addr_len < af->sockaddr_len) {
4547 /* Pass correct addr len to common routine (so it knows there
4548 * is only one address being passed.
4550 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4557 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4558 int addr_len, int flags)
4560 if (addr_len < sizeof(uaddr->sa_family))
4563 if (uaddr->sa_family == AF_UNSPEC)
4566 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4569 /* FIXME: Write comments. */
4570 static int sctp_disconnect(struct sock *sk, int flags)
4572 return -EOPNOTSUPP; /* STUB */
4575 /* 4.1.4 accept() - TCP Style Syntax
4577 * Applications use accept() call to remove an established SCTP
4578 * association from the accept queue of the endpoint. A new socket
4579 * descriptor will be returned from accept() to represent the newly
4580 * formed association.
4582 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4584 struct sctp_sock *sp;
4585 struct sctp_endpoint *ep;
4586 struct sock *newsk = NULL;
4587 struct sctp_association *asoc;
4596 if (!sctp_style(sk, TCP)) {
4597 error = -EOPNOTSUPP;
4601 if (!sctp_sstate(sk, LISTENING)) {
4606 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4608 error = sctp_wait_for_accept(sk, timeo);
4612 /* We treat the list of associations on the endpoint as the accept
4613 * queue and pick the first association on the list.
4615 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4617 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4623 /* Populate the fields of the newsk from the oldsk and migrate the
4624 * asoc to the newsk.
4626 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4634 /* The SCTP ioctl handler. */
4635 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4642 * SEQPACKET-style sockets in LISTENING state are valid, for
4643 * SCTP, so only discard TCP-style sockets in LISTENING state.
4645 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4650 struct sk_buff *skb;
4651 unsigned int amount = 0;
4653 skb = skb_peek(&sk->sk_receive_queue);
4656 * We will only return the amount of this packet since
4657 * that is all that will be read.
4661 rc = put_user(amount, (int __user *)arg);
4673 /* This is the function which gets called during socket creation to
4674 * initialized the SCTP-specific portion of the sock.
4675 * The sock structure should already be zero-filled memory.
4677 static int sctp_init_sock(struct sock *sk)
4679 struct net *net = sock_net(sk);
4680 struct sctp_sock *sp;
4682 pr_debug("%s: sk:%p\n", __func__, sk);
4686 /* Initialize the SCTP per socket area. */
4687 switch (sk->sk_type) {
4688 case SOCK_SEQPACKET:
4689 sp->type = SCTP_SOCKET_UDP;
4692 sp->type = SCTP_SOCKET_TCP;
4695 return -ESOCKTNOSUPPORT;
4698 sk->sk_gso_type = SKB_GSO_SCTP;
4700 /* Initialize default send parameters. These parameters can be
4701 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4703 sp->default_stream = 0;
4704 sp->default_ppid = 0;
4705 sp->default_flags = 0;
4706 sp->default_context = 0;
4707 sp->default_timetolive = 0;
4709 sp->default_rcv_context = 0;
4710 sp->max_burst = net->sctp.max_burst;
4712 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4714 /* Initialize default setup parameters. These parameters
4715 * can be modified with the SCTP_INITMSG socket option or
4716 * overridden by the SCTP_INIT CMSG.
4718 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4719 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4720 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4721 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4723 /* Initialize default RTO related parameters. These parameters can
4724 * be modified for with the SCTP_RTOINFO socket option.
4726 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4727 sp->rtoinfo.srto_max = net->sctp.rto_max;
4728 sp->rtoinfo.srto_min = net->sctp.rto_min;
4730 /* Initialize default association related parameters. These parameters
4731 * can be modified with the SCTP_ASSOCINFO socket option.
4733 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4734 sp->assocparams.sasoc_number_peer_destinations = 0;
4735 sp->assocparams.sasoc_peer_rwnd = 0;
4736 sp->assocparams.sasoc_local_rwnd = 0;
4737 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4739 /* Initialize default event subscriptions. By default, all the
4742 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4744 /* Default Peer Address Parameters. These defaults can
4745 * be modified via SCTP_PEER_ADDR_PARAMS
4747 sp->hbinterval = net->sctp.hb_interval;
4748 sp->pathmaxrxt = net->sctp.max_retrans_path;
4749 sp->pathmtu = 0; /* allow default discovery */
4750 sp->sackdelay = net->sctp.sack_timeout;
4752 sp->param_flags = SPP_HB_ENABLE |
4754 SPP_SACKDELAY_ENABLE;
4756 /* If enabled no SCTP message fragmentation will be performed.
4757 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4759 sp->disable_fragments = 0;
4761 /* Enable Nagle algorithm by default. */
4764 sp->recvrcvinfo = 0;
4765 sp->recvnxtinfo = 0;
4767 /* Enable by default. */
4770 /* Auto-close idle associations after the configured
4771 * number of seconds. A value of 0 disables this
4772 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4773 * for UDP-style sockets only.
4777 /* User specified fragmentation limit. */
4780 sp->adaptation_ind = 0;
4782 sp->pf = sctp_get_pf_specific(sk->sk_family);
4784 /* Control variables for partial data delivery. */
4785 atomic_set(&sp->pd_mode, 0);
4786 skb_queue_head_init(&sp->pd_lobby);
4787 sp->frag_interleave = 0;
4789 /* Create a per socket endpoint structure. Even if we
4790 * change the data structure relationships, this may still
4791 * be useful for storing pre-connect address information.
4793 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4799 sk->sk_destruct = sctp_destruct_sock;
4801 SCTP_DBG_OBJCNT_INC(sock);
4804 sk_sockets_allocated_inc(sk);
4805 sock_prot_inuse_add(net, sk->sk_prot, 1);
4807 /* Nothing can fail after this block, otherwise
4808 * sctp_destroy_sock() will be called without addr_wq_lock held
4810 if (net->sctp.default_auto_asconf) {
4811 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4812 list_add_tail(&sp->auto_asconf_list,
4813 &net->sctp.auto_asconf_splist);
4814 sp->do_auto_asconf = 1;
4815 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4817 sp->do_auto_asconf = 0;
4825 /* Cleanup any SCTP per socket resources. Must be called with
4826 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4828 static void sctp_destroy_sock(struct sock *sk)
4830 struct sctp_sock *sp;
4832 pr_debug("%s: sk:%p\n", __func__, sk);
4834 /* Release our hold on the endpoint. */
4836 /* This could happen during socket init, thus we bail out
4837 * early, since the rest of the below is not setup either.
4842 if (sp->do_auto_asconf) {
4843 sp->do_auto_asconf = 0;
4844 list_del(&sp->auto_asconf_list);
4846 sctp_endpoint_free(sp->ep);
4848 sk_sockets_allocated_dec(sk);
4849 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4853 /* Triggered when there are no references on the socket anymore */
4854 static void sctp_destruct_sock(struct sock *sk)
4856 struct sctp_sock *sp = sctp_sk(sk);
4858 /* Free up the HMAC transform. */
4859 crypto_free_shash(sp->hmac);
4861 inet_sock_destruct(sk);
4864 /* API 4.1.7 shutdown() - TCP Style Syntax
4865 * int shutdown(int socket, int how);
4867 * sd - the socket descriptor of the association to be closed.
4868 * how - Specifies the type of shutdown. The values are
4871 * Disables further receive operations. No SCTP
4872 * protocol action is taken.
4874 * Disables further send operations, and initiates
4875 * the SCTP shutdown sequence.
4877 * Disables further send and receive operations
4878 * and initiates the SCTP shutdown sequence.
4880 static void sctp_shutdown(struct sock *sk, int how)
4882 struct net *net = sock_net(sk);
4883 struct sctp_endpoint *ep;
4885 if (!sctp_style(sk, TCP))
4888 ep = sctp_sk(sk)->ep;
4889 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4890 struct sctp_association *asoc;
4892 inet_sk_set_state(sk, SCTP_SS_CLOSING);
4893 asoc = list_entry(ep->asocs.next,
4894 struct sctp_association, asocs);
4895 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4899 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4900 struct sctp_info *info)
4902 struct sctp_transport *prim;
4903 struct list_head *pos;
4906 memset(info, 0, sizeof(*info));
4908 struct sctp_sock *sp = sctp_sk(sk);
4910 info->sctpi_s_autoclose = sp->autoclose;
4911 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4912 info->sctpi_s_pd_point = sp->pd_point;
4913 info->sctpi_s_nodelay = sp->nodelay;
4914 info->sctpi_s_disable_fragments = sp->disable_fragments;
4915 info->sctpi_s_v4mapped = sp->v4mapped;
4916 info->sctpi_s_frag_interleave = sp->frag_interleave;
4917 info->sctpi_s_type = sp->type;
4922 info->sctpi_tag = asoc->c.my_vtag;
4923 info->sctpi_state = asoc->state;
4924 info->sctpi_rwnd = asoc->a_rwnd;
4925 info->sctpi_unackdata = asoc->unack_data;
4926 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4927 info->sctpi_instrms = asoc->stream.incnt;
4928 info->sctpi_outstrms = asoc->stream.outcnt;
4929 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4930 info->sctpi_inqueue++;
4931 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4932 info->sctpi_outqueue++;
4933 info->sctpi_overall_error = asoc->overall_error_count;
4934 info->sctpi_max_burst = asoc->max_burst;
4935 info->sctpi_maxseg = asoc->frag_point;
4936 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4937 info->sctpi_peer_tag = asoc->c.peer_vtag;
4939 mask = asoc->peer.ecn_capable << 1;
4940 mask = (mask | asoc->peer.ipv4_address) << 1;
4941 mask = (mask | asoc->peer.ipv6_address) << 1;
4942 mask = (mask | asoc->peer.hostname_address) << 1;
4943 mask = (mask | asoc->peer.asconf_capable) << 1;
4944 mask = (mask | asoc->peer.prsctp_capable) << 1;
4945 mask = (mask | asoc->peer.auth_capable);
4946 info->sctpi_peer_capable = mask;
4947 mask = asoc->peer.sack_needed << 1;
4948 mask = (mask | asoc->peer.sack_generation) << 1;
4949 mask = (mask | asoc->peer.zero_window_announced);
4950 info->sctpi_peer_sack = mask;
4952 info->sctpi_isacks = asoc->stats.isacks;
4953 info->sctpi_osacks = asoc->stats.osacks;
4954 info->sctpi_opackets = asoc->stats.opackets;
4955 info->sctpi_ipackets = asoc->stats.ipackets;
4956 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4957 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4958 info->sctpi_idupchunks = asoc->stats.idupchunks;
4959 info->sctpi_gapcnt = asoc->stats.gapcnt;
4960 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4961 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4962 info->sctpi_oodchunks = asoc->stats.oodchunks;
4963 info->sctpi_iodchunks = asoc->stats.iodchunks;
4964 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4965 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4967 prim = asoc->peer.primary_path;
4968 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4969 info->sctpi_p_state = prim->state;
4970 info->sctpi_p_cwnd = prim->cwnd;
4971 info->sctpi_p_srtt = prim->srtt;
4972 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4973 info->sctpi_p_hbinterval = prim->hbinterval;
4974 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4975 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4976 info->sctpi_p_ssthresh = prim->ssthresh;
4977 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4978 info->sctpi_p_flight_size = prim->flight_size;
4979 info->sctpi_p_error = prim->error_count;
4983 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4985 /* use callback to avoid exporting the core structure */
4986 void sctp_transport_walk_start(struct rhashtable_iter *iter)
4988 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4990 rhashtable_walk_start(iter);
4993 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4995 rhashtable_walk_stop(iter);
4996 rhashtable_walk_exit(iter);
4999 struct sctp_transport *sctp_transport_get_next(struct net *net,
5000 struct rhashtable_iter *iter)
5002 struct sctp_transport *t;
5004 t = rhashtable_walk_next(iter);
5005 for (; t; t = rhashtable_walk_next(iter)) {
5007 if (PTR_ERR(t) == -EAGAIN)
5012 if (!sctp_transport_hold(t))
5015 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5016 t->asoc->peer.primary_path == t)
5019 sctp_transport_put(t);
5025 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5026 struct rhashtable_iter *iter,
5029 struct sctp_transport *t;
5032 return SEQ_START_TOKEN;
5034 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5037 sctp_transport_put(t);
5043 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5047 struct sctp_ep_common *epb;
5048 struct sctp_hashbucket *head;
5050 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5052 read_lock_bh(&head->lock);
5053 sctp_for_each_hentry(epb, &head->chain) {
5054 err = cb(sctp_ep(epb), p);
5058 read_unlock_bh(&head->lock);
5063 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5065 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5067 const union sctp_addr *laddr,
5068 const union sctp_addr *paddr, void *p)
5070 struct sctp_transport *transport;
5074 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5079 err = cb(transport, p);
5080 sctp_transport_put(transport);
5084 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5086 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5087 int (*cb_done)(struct sctp_transport *, void *),
5088 struct net *net, int *pos, void *p) {
5089 struct rhashtable_iter hti;
5090 struct sctp_transport *tsp;
5095 sctp_transport_walk_start(&hti);
5097 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5098 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5103 sctp_transport_put(tsp);
5105 sctp_transport_walk_stop(&hti);
5108 if (cb_done && !cb_done(tsp, p)) {
5110 sctp_transport_put(tsp);
5113 sctp_transport_put(tsp);
5118 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5120 /* 7.2.1 Association Status (SCTP_STATUS)
5122 * Applications can retrieve current status information about an
5123 * association, including association state, peer receiver window size,
5124 * number of unacked data chunks, and number of data chunks pending
5125 * receipt. This information is read-only.
5127 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5128 char __user *optval,
5131 struct sctp_status status;
5132 struct sctp_association *asoc = NULL;
5133 struct sctp_transport *transport;
5134 sctp_assoc_t associd;
5137 if (len < sizeof(status)) {
5142 len = sizeof(status);
5143 if (copy_from_user(&status, optval, len)) {
5148 associd = status.sstat_assoc_id;
5149 asoc = sctp_id2assoc(sk, associd);
5155 transport = asoc->peer.primary_path;
5157 status.sstat_assoc_id = sctp_assoc2id(asoc);
5158 status.sstat_state = sctp_assoc_to_state(asoc);
5159 status.sstat_rwnd = asoc->peer.rwnd;
5160 status.sstat_unackdata = asoc->unack_data;
5162 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5163 status.sstat_instrms = asoc->stream.incnt;
5164 status.sstat_outstrms = asoc->stream.outcnt;
5165 status.sstat_fragmentation_point = asoc->frag_point;
5166 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5167 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5168 transport->af_specific->sockaddr_len);
5169 /* Map ipv4 address into v4-mapped-on-v6 address. */
5170 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5171 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5172 status.sstat_primary.spinfo_state = transport->state;
5173 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5174 status.sstat_primary.spinfo_srtt = transport->srtt;
5175 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5176 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5178 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5179 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5181 if (put_user(len, optlen)) {
5186 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5187 __func__, len, status.sstat_state, status.sstat_rwnd,
5188 status.sstat_assoc_id);
5190 if (copy_to_user(optval, &status, len)) {
5200 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5202 * Applications can retrieve information about a specific peer address
5203 * of an association, including its reachability state, congestion
5204 * window, and retransmission timer values. This information is
5207 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5208 char __user *optval,
5211 struct sctp_paddrinfo pinfo;
5212 struct sctp_transport *transport;
5215 if (len < sizeof(pinfo)) {
5220 len = sizeof(pinfo);
5221 if (copy_from_user(&pinfo, optval, len)) {
5226 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5227 pinfo.spinfo_assoc_id);
5231 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5232 pinfo.spinfo_state = transport->state;
5233 pinfo.spinfo_cwnd = transport->cwnd;
5234 pinfo.spinfo_srtt = transport->srtt;
5235 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5236 pinfo.spinfo_mtu = transport->pathmtu;
5238 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5239 pinfo.spinfo_state = SCTP_ACTIVE;
5241 if (put_user(len, optlen)) {
5246 if (copy_to_user(optval, &pinfo, len)) {
5255 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5257 * This option is a on/off flag. If enabled no SCTP message
5258 * fragmentation will be performed. Instead if a message being sent
5259 * exceeds the current PMTU size, the message will NOT be sent and
5260 * instead a error will be indicated to the user.
5262 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5263 char __user *optval, int __user *optlen)
5267 if (len < sizeof(int))
5271 val = (sctp_sk(sk)->disable_fragments == 1);
5272 if (put_user(len, optlen))
5274 if (copy_to_user(optval, &val, len))
5279 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5281 * This socket option is used to specify various notifications and
5282 * ancillary data the user wishes to receive.
5284 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5289 if (len > sizeof(struct sctp_event_subscribe))
5290 len = sizeof(struct sctp_event_subscribe);
5291 if (put_user(len, optlen))
5293 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
5298 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5300 * This socket option is applicable to the UDP-style socket only. When
5301 * set it will cause associations that are idle for more than the
5302 * specified number of seconds to automatically close. An association
5303 * being idle is defined an association that has NOT sent or received
5304 * user data. The special value of '0' indicates that no automatic
5305 * close of any associations should be performed. The option expects an
5306 * integer defining the number of seconds of idle time before an
5307 * association is closed.
5309 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5311 /* Applicable to UDP-style socket only */
5312 if (sctp_style(sk, TCP))
5314 if (len < sizeof(int))
5317 if (put_user(len, optlen))
5319 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5324 /* Helper routine to branch off an association to a new socket. */
5325 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5327 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5328 struct sctp_sock *sp = sctp_sk(sk);
5329 struct socket *sock;
5332 /* Do not peel off from one netns to another one. */
5333 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5339 /* An association cannot be branched off from an already peeled-off
5340 * socket, nor is this supported for tcp style sockets.
5342 if (!sctp_style(sk, UDP))
5345 /* Create a new socket. */
5346 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5350 sctp_copy_sock(sock->sk, sk, asoc);
5352 /* Make peeled-off sockets more like 1-1 accepted sockets.
5353 * Set the daddr and initialize id to something more random and also
5354 * copy over any ip options.
5356 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5357 sp->pf->copy_ip_options(sk, sock->sk);
5359 /* Populate the fields of the newsk from the oldsk and migrate the
5360 * asoc to the newsk.
5362 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5368 EXPORT_SYMBOL(sctp_do_peeloff);
5370 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5371 struct file **newfile, unsigned flags)
5373 struct socket *newsock;
5376 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5380 /* Map the socket to an unused fd that can be returned to the user. */
5381 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5383 sock_release(newsock);
5387 *newfile = sock_alloc_file(newsock, 0, NULL);
5388 if (IS_ERR(*newfile)) {
5389 put_unused_fd(retval);
5390 retval = PTR_ERR(*newfile);
5395 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5398 peeloff->sd = retval;
5400 if (flags & SOCK_NONBLOCK)
5401 (*newfile)->f_flags |= O_NONBLOCK;
5406 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5408 sctp_peeloff_arg_t peeloff;
5409 struct file *newfile = NULL;
5412 if (len < sizeof(sctp_peeloff_arg_t))
5414 len = sizeof(sctp_peeloff_arg_t);
5415 if (copy_from_user(&peeloff, optval, len))
5418 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5422 /* Return the fd mapped to the new socket. */
5423 if (put_user(len, optlen)) {
5425 put_unused_fd(retval);
5429 if (copy_to_user(optval, &peeloff, len)) {
5431 put_unused_fd(retval);
5434 fd_install(retval, newfile);
5439 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5440 char __user *optval, int __user *optlen)
5442 sctp_peeloff_flags_arg_t peeloff;
5443 struct file *newfile = NULL;
5446 if (len < sizeof(sctp_peeloff_flags_arg_t))
5448 len = sizeof(sctp_peeloff_flags_arg_t);
5449 if (copy_from_user(&peeloff, optval, len))
5452 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5453 &newfile, peeloff.flags);
5457 /* Return the fd mapped to the new socket. */
5458 if (put_user(len, optlen)) {
5460 put_unused_fd(retval);
5464 if (copy_to_user(optval, &peeloff, len)) {
5466 put_unused_fd(retval);
5469 fd_install(retval, newfile);
5474 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5476 * Applications can enable or disable heartbeats for any peer address of
5477 * an association, modify an address's heartbeat interval, force a
5478 * heartbeat to be sent immediately, and adjust the address's maximum
5479 * number of retransmissions sent before an address is considered
5480 * unreachable. The following structure is used to access and modify an
5481 * address's parameters:
5483 * struct sctp_paddrparams {
5484 * sctp_assoc_t spp_assoc_id;
5485 * struct sockaddr_storage spp_address;
5486 * uint32_t spp_hbinterval;
5487 * uint16_t spp_pathmaxrxt;
5488 * uint32_t spp_pathmtu;
5489 * uint32_t spp_sackdelay;
5490 * uint32_t spp_flags;
5493 * spp_assoc_id - (one-to-many style socket) This is filled in the
5494 * application, and identifies the association for
5496 * spp_address - This specifies which address is of interest.
5497 * spp_hbinterval - This contains the value of the heartbeat interval,
5498 * in milliseconds. If a value of zero
5499 * is present in this field then no changes are to
5500 * be made to this parameter.
5501 * spp_pathmaxrxt - This contains the maximum number of
5502 * retransmissions before this address shall be
5503 * considered unreachable. If a value of zero
5504 * is present in this field then no changes are to
5505 * be made to this parameter.
5506 * spp_pathmtu - When Path MTU discovery is disabled the value
5507 * specified here will be the "fixed" path mtu.
5508 * Note that if the spp_address field is empty
5509 * then all associations on this address will
5510 * have this fixed path mtu set upon them.
5512 * spp_sackdelay - When delayed sack is enabled, this value specifies
5513 * the number of milliseconds that sacks will be delayed
5514 * for. This value will apply to all addresses of an
5515 * association if the spp_address field is empty. Note
5516 * also, that if delayed sack is enabled and this
5517 * value is set to 0, no change is made to the last
5518 * recorded delayed sack timer value.
5520 * spp_flags - These flags are used to control various features
5521 * on an association. The flag field may contain
5522 * zero or more of the following options.
5524 * SPP_HB_ENABLE - Enable heartbeats on the
5525 * specified address. Note that if the address
5526 * field is empty all addresses for the association
5527 * have heartbeats enabled upon them.
5529 * SPP_HB_DISABLE - Disable heartbeats on the
5530 * speicifed address. Note that if the address
5531 * field is empty all addresses for the association
5532 * will have their heartbeats disabled. Note also
5533 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5534 * mutually exclusive, only one of these two should
5535 * be specified. Enabling both fields will have
5536 * undetermined results.
5538 * SPP_HB_DEMAND - Request a user initiated heartbeat
5539 * to be made immediately.
5541 * SPP_PMTUD_ENABLE - This field will enable PMTU
5542 * discovery upon the specified address. Note that
5543 * if the address feild is empty then all addresses
5544 * on the association are effected.
5546 * SPP_PMTUD_DISABLE - This field will disable PMTU
5547 * discovery upon the specified address. Note that
5548 * if the address feild is empty then all addresses
5549 * on the association are effected. Not also that
5550 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5551 * exclusive. Enabling both will have undetermined
5554 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5555 * on delayed sack. The time specified in spp_sackdelay
5556 * is used to specify the sack delay for this address. Note
5557 * that if spp_address is empty then all addresses will
5558 * enable delayed sack and take on the sack delay
5559 * value specified in spp_sackdelay.
5560 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5561 * off delayed sack. If the spp_address field is blank then
5562 * delayed sack is disabled for the entire association. Note
5563 * also that this field is mutually exclusive to
5564 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5567 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5568 * setting of the IPV6 flow label value. The value is
5569 * contained in the spp_ipv6_flowlabel field.
5570 * Upon retrieval, this flag will be set to indicate that
5571 * the spp_ipv6_flowlabel field has a valid value returned.
5572 * If a specific destination address is set (in the
5573 * spp_address field), then the value returned is that of
5574 * the address. If just an association is specified (and
5575 * no address), then the association's default flow label
5576 * is returned. If neither an association nor a destination
5577 * is specified, then the socket's default flow label is
5578 * returned. For non-IPv6 sockets, this flag will be left
5581 * SPP_DSCP: Setting this flag enables the setting of the
5582 * Differentiated Services Code Point (DSCP) value
5583 * associated with either the association or a specific
5584 * address. The value is obtained in the spp_dscp field.
5585 * Upon retrieval, this flag will be set to indicate that
5586 * the spp_dscp field has a valid value returned. If a
5587 * specific destination address is set when called (in the
5588 * spp_address field), then that specific destination
5589 * address's DSCP value is returned. If just an association
5590 * is specified, then the association's default DSCP is
5591 * returned. If neither an association nor a destination is
5592 * specified, then the socket's default DSCP is returned.
5594 * spp_ipv6_flowlabel
5595 * - This field is used in conjunction with the
5596 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5597 * The 20 least significant bits are used for the flow
5598 * label. This setting has precedence over any IPv6-layer
5601 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5602 * and contains the DSCP. The 6 most significant bits are
5603 * used for the DSCP. This setting has precedence over any
5604 * IPv4- or IPv6- layer setting.
5606 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5607 char __user *optval, int __user *optlen)
5609 struct sctp_paddrparams params;
5610 struct sctp_transport *trans = NULL;
5611 struct sctp_association *asoc = NULL;
5612 struct sctp_sock *sp = sctp_sk(sk);
5614 if (len >= sizeof(params))
5615 len = sizeof(params);
5616 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5617 spp_ipv6_flowlabel), 4))
5618 len = ALIGN(offsetof(struct sctp_paddrparams,
5619 spp_ipv6_flowlabel), 4);
5623 if (copy_from_user(¶ms, optval, len))
5626 /* If an address other than INADDR_ANY is specified, and
5627 * no transport is found, then the request is invalid.
5629 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5630 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5631 params.spp_assoc_id);
5633 pr_debug("%s: failed no transport\n", __func__);
5638 /* Get association, if assoc_id != 0 and the socket is a one
5639 * to many style socket, and an association was not found, then
5640 * the id was invalid.
5642 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5643 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5644 pr_debug("%s: failed no association\n", __func__);
5649 /* Fetch transport values. */
5650 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5651 params.spp_pathmtu = trans->pathmtu;
5652 params.spp_pathmaxrxt = trans->pathmaxrxt;
5653 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5655 /*draft-11 doesn't say what to return in spp_flags*/
5656 params.spp_flags = trans->param_flags;
5657 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5658 params.spp_ipv6_flowlabel = trans->flowlabel &
5659 SCTP_FLOWLABEL_VAL_MASK;
5660 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5662 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5663 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5664 params.spp_flags |= SPP_DSCP;
5667 /* Fetch association values. */
5668 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5669 params.spp_pathmtu = asoc->pathmtu;
5670 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5671 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5673 /*draft-11 doesn't say what to return in spp_flags*/
5674 params.spp_flags = asoc->param_flags;
5675 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5676 params.spp_ipv6_flowlabel = asoc->flowlabel &
5677 SCTP_FLOWLABEL_VAL_MASK;
5678 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5680 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5681 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5682 params.spp_flags |= SPP_DSCP;
5685 /* Fetch socket values. */
5686 params.spp_hbinterval = sp->hbinterval;
5687 params.spp_pathmtu = sp->pathmtu;
5688 params.spp_sackdelay = sp->sackdelay;
5689 params.spp_pathmaxrxt = sp->pathmaxrxt;
5691 /*draft-11 doesn't say what to return in spp_flags*/
5692 params.spp_flags = sp->param_flags;
5693 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5694 params.spp_ipv6_flowlabel = sp->flowlabel &
5695 SCTP_FLOWLABEL_VAL_MASK;
5696 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5698 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5699 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5700 params.spp_flags |= SPP_DSCP;
5704 if (copy_to_user(optval, ¶ms, len))
5707 if (put_user(len, optlen))
5714 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5716 * This option will effect the way delayed acks are performed. This
5717 * option allows you to get or set the delayed ack time, in
5718 * milliseconds. It also allows changing the delayed ack frequency.
5719 * Changing the frequency to 1 disables the delayed sack algorithm. If
5720 * the assoc_id is 0, then this sets or gets the endpoints default
5721 * values. If the assoc_id field is non-zero, then the set or get
5722 * effects the specified association for the one to many model (the
5723 * assoc_id field is ignored by the one to one model). Note that if
5724 * sack_delay or sack_freq are 0 when setting this option, then the
5725 * current values will remain unchanged.
5727 * struct sctp_sack_info {
5728 * sctp_assoc_t sack_assoc_id;
5729 * uint32_t sack_delay;
5730 * uint32_t sack_freq;
5733 * sack_assoc_id - This parameter, indicates which association the user
5734 * is performing an action upon. Note that if this field's value is
5735 * zero then the endpoints default value is changed (effecting future
5736 * associations only).
5738 * sack_delay - This parameter contains the number of milliseconds that
5739 * the user is requesting the delayed ACK timer be set to. Note that
5740 * this value is defined in the standard to be between 200 and 500
5743 * sack_freq - This parameter contains the number of packets that must
5744 * be received before a sack is sent without waiting for the delay
5745 * timer to expire. The default value for this is 2, setting this
5746 * value to 1 will disable the delayed sack algorithm.
5748 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5749 char __user *optval,
5752 struct sctp_sack_info params;
5753 struct sctp_association *asoc = NULL;
5754 struct sctp_sock *sp = sctp_sk(sk);
5756 if (len >= sizeof(struct sctp_sack_info)) {
5757 len = sizeof(struct sctp_sack_info);
5759 if (copy_from_user(¶ms, optval, len))
5761 } else if (len == sizeof(struct sctp_assoc_value)) {
5762 pr_warn_ratelimited(DEPRECATED
5764 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5765 "Use struct sctp_sack_info instead\n",
5766 current->comm, task_pid_nr(current));
5767 if (copy_from_user(¶ms, optval, len))
5772 /* Get association, if sack_assoc_id != 0 and the socket is a one
5773 * to many style socket, and an association was not found, then
5774 * the id was invalid.
5776 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5777 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5781 /* Fetch association values. */
5782 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5783 params.sack_delay = jiffies_to_msecs(
5785 params.sack_freq = asoc->sackfreq;
5788 params.sack_delay = 0;
5789 params.sack_freq = 1;
5792 /* Fetch socket values. */
5793 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5794 params.sack_delay = sp->sackdelay;
5795 params.sack_freq = sp->sackfreq;
5797 params.sack_delay = 0;
5798 params.sack_freq = 1;
5802 if (copy_to_user(optval, ¶ms, len))
5805 if (put_user(len, optlen))
5811 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5813 * Applications can specify protocol parameters for the default association
5814 * initialization. The option name argument to setsockopt() and getsockopt()
5817 * Setting initialization parameters is effective only on an unconnected
5818 * socket (for UDP-style sockets only future associations are effected
5819 * by the change). With TCP-style sockets, this option is inherited by
5820 * sockets derived from a listener socket.
5822 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5824 if (len < sizeof(struct sctp_initmsg))
5826 len = sizeof(struct sctp_initmsg);
5827 if (put_user(len, optlen))
5829 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5835 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5836 char __user *optval, int __user *optlen)
5838 struct sctp_association *asoc;
5840 struct sctp_getaddrs getaddrs;
5841 struct sctp_transport *from;
5843 union sctp_addr temp;
5844 struct sctp_sock *sp = sctp_sk(sk);
5849 if (len < sizeof(struct sctp_getaddrs))
5852 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5855 /* For UDP-style sockets, id specifies the association to query. */
5856 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5860 to = optval + offsetof(struct sctp_getaddrs, addrs);
5861 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5863 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5865 memcpy(&temp, &from->ipaddr, sizeof(temp));
5866 addrlen = sctp_get_pf_specific(sk->sk_family)
5867 ->addr_to_user(sp, &temp);
5868 if (space_left < addrlen)
5870 if (copy_to_user(to, &temp, addrlen))
5874 space_left -= addrlen;
5877 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5879 bytes_copied = ((char __user *)to) - optval;
5880 if (put_user(bytes_copied, optlen))
5886 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5887 size_t space_left, int *bytes_copied)
5889 struct sctp_sockaddr_entry *addr;
5890 union sctp_addr temp;
5893 struct net *net = sock_net(sk);
5896 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5900 if ((PF_INET == sk->sk_family) &&
5901 (AF_INET6 == addr->a.sa.sa_family))
5903 if ((PF_INET6 == sk->sk_family) &&
5904 inet_v6_ipv6only(sk) &&
5905 (AF_INET == addr->a.sa.sa_family))
5907 memcpy(&temp, &addr->a, sizeof(temp));
5908 if (!temp.v4.sin_port)
5909 temp.v4.sin_port = htons(port);
5911 addrlen = sctp_get_pf_specific(sk->sk_family)
5912 ->addr_to_user(sctp_sk(sk), &temp);
5914 if (space_left < addrlen) {
5918 memcpy(to, &temp, addrlen);
5922 space_left -= addrlen;
5923 *bytes_copied += addrlen;
5931 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5932 char __user *optval, int __user *optlen)
5934 struct sctp_bind_addr *bp;
5935 struct sctp_association *asoc;
5937 struct sctp_getaddrs getaddrs;
5938 struct sctp_sockaddr_entry *addr;
5940 union sctp_addr temp;
5941 struct sctp_sock *sp = sctp_sk(sk);
5945 int bytes_copied = 0;
5949 if (len < sizeof(struct sctp_getaddrs))
5952 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5956 * For UDP-style sockets, id specifies the association to query.
5957 * If the id field is set to the value '0' then the locally bound
5958 * addresses are returned without regard to any particular
5961 if (0 == getaddrs.assoc_id) {
5962 bp = &sctp_sk(sk)->ep->base.bind_addr;
5964 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5967 bp = &asoc->base.bind_addr;
5970 to = optval + offsetof(struct sctp_getaddrs, addrs);
5971 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5973 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5977 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5978 * addresses from the global local address list.
5980 if (sctp_list_single_entry(&bp->address_list)) {
5981 addr = list_entry(bp->address_list.next,
5982 struct sctp_sockaddr_entry, list);
5983 if (sctp_is_any(sk, &addr->a)) {
5984 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5985 space_left, &bytes_copied);
5995 /* Protection on the bound address list is not needed since
5996 * in the socket option context we hold a socket lock and
5997 * thus the bound address list can't change.
5999 list_for_each_entry(addr, &bp->address_list, list) {
6000 memcpy(&temp, &addr->a, sizeof(temp));
6001 addrlen = sctp_get_pf_specific(sk->sk_family)
6002 ->addr_to_user(sp, &temp);
6003 if (space_left < addrlen) {
6004 err = -ENOMEM; /*fixme: right error?*/
6007 memcpy(buf, &temp, addrlen);
6009 bytes_copied += addrlen;
6011 space_left -= addrlen;
6015 if (copy_to_user(to, addrs, bytes_copied)) {
6019 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6023 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6024 * but we can't change it anymore.
6026 if (put_user(bytes_copied, optlen))
6033 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6035 * Requests that the local SCTP stack use the enclosed peer address as
6036 * the association primary. The enclosed address must be one of the
6037 * association peer's addresses.
6039 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6040 char __user *optval, int __user *optlen)
6042 struct sctp_prim prim;
6043 struct sctp_association *asoc;
6044 struct sctp_sock *sp = sctp_sk(sk);
6046 if (len < sizeof(struct sctp_prim))
6049 len = sizeof(struct sctp_prim);
6051 if (copy_from_user(&prim, optval, len))
6054 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6058 if (!asoc->peer.primary_path)
6061 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6062 asoc->peer.primary_path->af_specific->sockaddr_len);
6064 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6065 (union sctp_addr *)&prim.ssp_addr);
6067 if (put_user(len, optlen))
6069 if (copy_to_user(optval, &prim, len))
6076 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6078 * Requests that the local endpoint set the specified Adaptation Layer
6079 * Indication parameter for all future INIT and INIT-ACK exchanges.
6081 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6082 char __user *optval, int __user *optlen)
6084 struct sctp_setadaptation adaptation;
6086 if (len < sizeof(struct sctp_setadaptation))
6089 len = sizeof(struct sctp_setadaptation);
6091 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6093 if (put_user(len, optlen))
6095 if (copy_to_user(optval, &adaptation, len))
6103 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6105 * Applications that wish to use the sendto() system call may wish to
6106 * specify a default set of parameters that would normally be supplied
6107 * through the inclusion of ancillary data. This socket option allows
6108 * such an application to set the default sctp_sndrcvinfo structure.
6111 * The application that wishes to use this socket option simply passes
6112 * in to this call the sctp_sndrcvinfo structure defined in Section
6113 * 5.2.2) The input parameters accepted by this call include
6114 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6115 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6116 * to this call if the caller is using the UDP model.
6118 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6120 static int sctp_getsockopt_default_send_param(struct sock *sk,
6121 int len, char __user *optval,
6124 struct sctp_sock *sp = sctp_sk(sk);
6125 struct sctp_association *asoc;
6126 struct sctp_sndrcvinfo info;
6128 if (len < sizeof(info))
6133 if (copy_from_user(&info, optval, len))
6136 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6137 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
6140 info.sinfo_stream = asoc->default_stream;
6141 info.sinfo_flags = asoc->default_flags;
6142 info.sinfo_ppid = asoc->default_ppid;
6143 info.sinfo_context = asoc->default_context;
6144 info.sinfo_timetolive = asoc->default_timetolive;
6146 info.sinfo_stream = sp->default_stream;
6147 info.sinfo_flags = sp->default_flags;
6148 info.sinfo_ppid = sp->default_ppid;
6149 info.sinfo_context = sp->default_context;
6150 info.sinfo_timetolive = sp->default_timetolive;
6153 if (put_user(len, optlen))
6155 if (copy_to_user(optval, &info, len))
6161 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6162 * (SCTP_DEFAULT_SNDINFO)
6164 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6165 char __user *optval,
6168 struct sctp_sock *sp = sctp_sk(sk);
6169 struct sctp_association *asoc;
6170 struct sctp_sndinfo info;
6172 if (len < sizeof(info))
6177 if (copy_from_user(&info, optval, len))
6180 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6181 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
6184 info.snd_sid = asoc->default_stream;
6185 info.snd_flags = asoc->default_flags;
6186 info.snd_ppid = asoc->default_ppid;
6187 info.snd_context = asoc->default_context;
6189 info.snd_sid = sp->default_stream;
6190 info.snd_flags = sp->default_flags;
6191 info.snd_ppid = sp->default_ppid;
6192 info.snd_context = sp->default_context;
6195 if (put_user(len, optlen))
6197 if (copy_to_user(optval, &info, len))
6205 * 7.1.5 SCTP_NODELAY
6207 * Turn on/off any Nagle-like algorithm. This means that packets are
6208 * generally sent as soon as possible and no unnecessary delays are
6209 * introduced, at the cost of more packets in the network. Expects an
6210 * integer boolean flag.
6213 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6214 char __user *optval, int __user *optlen)
6218 if (len < sizeof(int))
6222 val = (sctp_sk(sk)->nodelay == 1);
6223 if (put_user(len, optlen))
6225 if (copy_to_user(optval, &val, len))
6232 * 7.1.1 SCTP_RTOINFO
6234 * The protocol parameters used to initialize and bound retransmission
6235 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6236 * and modify these parameters.
6237 * All parameters are time values, in milliseconds. A value of 0, when
6238 * modifying the parameters, indicates that the current value should not
6242 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6243 char __user *optval,
6244 int __user *optlen) {
6245 struct sctp_rtoinfo rtoinfo;
6246 struct sctp_association *asoc;
6248 if (len < sizeof (struct sctp_rtoinfo))
6251 len = sizeof(struct sctp_rtoinfo);
6253 if (copy_from_user(&rtoinfo, optval, len))
6256 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6258 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
6261 /* Values corresponding to the specific association. */
6263 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6264 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6265 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6267 /* Values corresponding to the endpoint. */
6268 struct sctp_sock *sp = sctp_sk(sk);
6270 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6271 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6272 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6275 if (put_user(len, optlen))
6278 if (copy_to_user(optval, &rtoinfo, len))
6286 * 7.1.2 SCTP_ASSOCINFO
6288 * This option is used to tune the maximum retransmission attempts
6289 * of the association.
6290 * Returns an error if the new association retransmission value is
6291 * greater than the sum of the retransmission value of the peer.
6292 * See [SCTP] for more information.
6295 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6296 char __user *optval,
6300 struct sctp_assocparams assocparams;
6301 struct sctp_association *asoc;
6302 struct list_head *pos;
6305 if (len < sizeof (struct sctp_assocparams))
6308 len = sizeof(struct sctp_assocparams);
6310 if (copy_from_user(&assocparams, optval, len))
6313 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6315 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
6318 /* Values correspoinding to the specific association */
6320 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6321 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6322 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6323 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6325 list_for_each(pos, &asoc->peer.transport_addr_list) {
6329 assocparams.sasoc_number_peer_destinations = cnt;
6331 /* Values corresponding to the endpoint */
6332 struct sctp_sock *sp = sctp_sk(sk);
6334 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6335 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6336 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6337 assocparams.sasoc_cookie_life =
6338 sp->assocparams.sasoc_cookie_life;
6339 assocparams.sasoc_number_peer_destinations =
6341 sasoc_number_peer_destinations;
6344 if (put_user(len, optlen))
6347 if (copy_to_user(optval, &assocparams, len))
6354 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6356 * This socket option is a boolean flag which turns on or off mapped V4
6357 * addresses. If this option is turned on and the socket is type
6358 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6359 * If this option is turned off, then no mapping will be done of V4
6360 * addresses and a user will receive both PF_INET6 and PF_INET type
6361 * addresses on the socket.
6363 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6364 char __user *optval, int __user *optlen)
6367 struct sctp_sock *sp = sctp_sk(sk);
6369 if (len < sizeof(int))
6374 if (put_user(len, optlen))
6376 if (copy_to_user(optval, &val, len))
6383 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6384 * (chapter and verse is quoted at sctp_setsockopt_context())
6386 static int sctp_getsockopt_context(struct sock *sk, int len,
6387 char __user *optval, int __user *optlen)
6389 struct sctp_assoc_value params;
6390 struct sctp_sock *sp;
6391 struct sctp_association *asoc;
6393 if (len < sizeof(struct sctp_assoc_value))
6396 len = sizeof(struct sctp_assoc_value);
6398 if (copy_from_user(¶ms, optval, len))
6403 if (params.assoc_id != 0) {
6404 asoc = sctp_id2assoc(sk, params.assoc_id);
6407 params.assoc_value = asoc->default_rcv_context;
6409 params.assoc_value = sp->default_rcv_context;
6412 if (put_user(len, optlen))
6414 if (copy_to_user(optval, ¶ms, len))
6421 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6422 * This option will get or set the maximum size to put in any outgoing
6423 * SCTP DATA chunk. If a message is larger than this size it will be
6424 * fragmented by SCTP into the specified size. Note that the underlying
6425 * SCTP implementation may fragment into smaller sized chunks when the
6426 * PMTU of the underlying association is smaller than the value set by
6427 * the user. The default value for this option is '0' which indicates
6428 * the user is NOT limiting fragmentation and only the PMTU will effect
6429 * SCTP's choice of DATA chunk size. Note also that values set larger
6430 * than the maximum size of an IP datagram will effectively let SCTP
6431 * control fragmentation (i.e. the same as setting this option to 0).
6433 * The following structure is used to access and modify this parameter:
6435 * struct sctp_assoc_value {
6436 * sctp_assoc_t assoc_id;
6437 * uint32_t assoc_value;
6440 * assoc_id: This parameter is ignored for one-to-one style sockets.
6441 * For one-to-many style sockets this parameter indicates which
6442 * association the user is performing an action upon. Note that if
6443 * this field's value is zero then the endpoints default value is
6444 * changed (effecting future associations only).
6445 * assoc_value: This parameter specifies the maximum size in bytes.
6447 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6448 char __user *optval, int __user *optlen)
6450 struct sctp_assoc_value params;
6451 struct sctp_association *asoc;
6453 if (len == sizeof(int)) {
6454 pr_warn_ratelimited(DEPRECATED
6456 "Use of int in maxseg socket option.\n"
6457 "Use struct sctp_assoc_value instead\n",
6458 current->comm, task_pid_nr(current));
6459 params.assoc_id = 0;
6460 } else if (len >= sizeof(struct sctp_assoc_value)) {
6461 len = sizeof(struct sctp_assoc_value);
6462 if (copy_from_user(¶ms, optval, len))
6467 asoc = sctp_id2assoc(sk, params.assoc_id);
6468 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6472 params.assoc_value = asoc->frag_point;
6474 params.assoc_value = sctp_sk(sk)->user_frag;
6476 if (put_user(len, optlen))
6478 if (len == sizeof(int)) {
6479 if (copy_to_user(optval, ¶ms.assoc_value, len))
6482 if (copy_to_user(optval, ¶ms, len))
6490 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6491 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6493 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6494 char __user *optval, int __user *optlen)
6498 if (len < sizeof(int))
6503 val = sctp_sk(sk)->frag_interleave;
6504 if (put_user(len, optlen))
6506 if (copy_to_user(optval, &val, len))
6513 * 7.1.25. Set or Get the sctp partial delivery point
6514 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6516 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6517 char __user *optval,
6522 if (len < sizeof(u32))
6527 val = sctp_sk(sk)->pd_point;
6528 if (put_user(len, optlen))
6530 if (copy_to_user(optval, &val, len))
6537 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6538 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6540 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6541 char __user *optval,
6544 struct sctp_assoc_value params;
6545 struct sctp_sock *sp;
6546 struct sctp_association *asoc;
6548 if (len == sizeof(int)) {
6549 pr_warn_ratelimited(DEPRECATED
6551 "Use of int in max_burst socket option.\n"
6552 "Use struct sctp_assoc_value instead\n",
6553 current->comm, task_pid_nr(current));
6554 params.assoc_id = 0;
6555 } else if (len >= sizeof(struct sctp_assoc_value)) {
6556 len = sizeof(struct sctp_assoc_value);
6557 if (copy_from_user(¶ms, optval, len))
6564 if (params.assoc_id != 0) {
6565 asoc = sctp_id2assoc(sk, params.assoc_id);
6568 params.assoc_value = asoc->max_burst;
6570 params.assoc_value = sp->max_burst;
6572 if (len == sizeof(int)) {
6573 if (copy_to_user(optval, ¶ms.assoc_value, len))
6576 if (copy_to_user(optval, ¶ms, len))
6584 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6585 char __user *optval, int __user *optlen)
6587 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6588 struct sctp_hmacalgo __user *p = (void __user *)optval;
6589 struct sctp_hmac_algo_param *hmacs;
6594 if (!ep->auth_enable)
6597 hmacs = ep->auth_hmacs_list;
6598 data_len = ntohs(hmacs->param_hdr.length) -
6599 sizeof(struct sctp_paramhdr);
6601 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6604 len = sizeof(struct sctp_hmacalgo) + data_len;
6605 num_idents = data_len / sizeof(u16);
6607 if (put_user(len, optlen))
6609 if (put_user(num_idents, &p->shmac_num_idents))
6611 for (i = 0; i < num_idents; i++) {
6612 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6614 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6620 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6621 char __user *optval, int __user *optlen)
6623 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6624 struct sctp_authkeyid val;
6625 struct sctp_association *asoc;
6627 if (!ep->auth_enable)
6630 if (len < sizeof(struct sctp_authkeyid))
6633 len = sizeof(struct sctp_authkeyid);
6634 if (copy_from_user(&val, optval, len))
6637 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6638 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6642 val.scact_keynumber = asoc->active_key_id;
6644 val.scact_keynumber = ep->active_key_id;
6646 if (put_user(len, optlen))
6648 if (copy_to_user(optval, &val, len))
6654 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6655 char __user *optval, int __user *optlen)
6657 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6658 struct sctp_authchunks __user *p = (void __user *)optval;
6659 struct sctp_authchunks val;
6660 struct sctp_association *asoc;
6661 struct sctp_chunks_param *ch;
6665 if (!ep->auth_enable)
6668 if (len < sizeof(struct sctp_authchunks))
6671 if (copy_from_user(&val, optval, sizeof(val)))
6674 to = p->gauth_chunks;
6675 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6679 ch = asoc->peer.peer_chunks;
6683 /* See if the user provided enough room for all the data */
6684 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6685 if (len < num_chunks)
6688 if (copy_to_user(to, ch->chunks, num_chunks))
6691 len = sizeof(struct sctp_authchunks) + num_chunks;
6692 if (put_user(len, optlen))
6694 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6699 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6700 char __user *optval, int __user *optlen)
6702 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6703 struct sctp_authchunks __user *p = (void __user *)optval;
6704 struct sctp_authchunks val;
6705 struct sctp_association *asoc;
6706 struct sctp_chunks_param *ch;
6710 if (!ep->auth_enable)
6713 if (len < sizeof(struct sctp_authchunks))
6716 if (copy_from_user(&val, optval, sizeof(val)))
6719 to = p->gauth_chunks;
6720 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6721 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6725 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6727 ch = ep->auth_chunk_list;
6732 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6733 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6736 if (copy_to_user(to, ch->chunks, num_chunks))
6739 len = sizeof(struct sctp_authchunks) + num_chunks;
6740 if (put_user(len, optlen))
6742 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6749 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6750 * This option gets the current number of associations that are attached
6751 * to a one-to-many style socket. The option value is an uint32_t.
6753 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6754 char __user *optval, int __user *optlen)
6756 struct sctp_sock *sp = sctp_sk(sk);
6757 struct sctp_association *asoc;
6760 if (sctp_style(sk, TCP))
6763 if (len < sizeof(u32))
6768 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6772 if (put_user(len, optlen))
6774 if (copy_to_user(optval, &val, len))
6781 * 8.1.23 SCTP_AUTO_ASCONF
6782 * See the corresponding setsockopt entry as description
6784 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6785 char __user *optval, int __user *optlen)
6789 if (len < sizeof(int))
6793 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6795 if (put_user(len, optlen))
6797 if (copy_to_user(optval, &val, len))
6803 * 8.2.6. Get the Current Identifiers of Associations
6804 * (SCTP_GET_ASSOC_ID_LIST)
6806 * This option gets the current list of SCTP association identifiers of
6807 * the SCTP associations handled by a one-to-many style socket.
6809 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6810 char __user *optval, int __user *optlen)
6812 struct sctp_sock *sp = sctp_sk(sk);
6813 struct sctp_association *asoc;
6814 struct sctp_assoc_ids *ids;
6817 if (sctp_style(sk, TCP))
6820 if (len < sizeof(struct sctp_assoc_ids))
6823 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6827 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6830 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6832 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6836 ids->gaids_number_of_ids = num;
6838 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6839 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6842 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6852 * SCTP_PEER_ADDR_THLDS
6854 * This option allows us to fetch the partially failed threshold for one or all
6855 * transports in an association. See Section 6.1 of:
6856 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6858 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6859 char __user *optval,
6863 struct sctp_paddrthlds val;
6864 struct sctp_transport *trans;
6865 struct sctp_association *asoc;
6867 if (len < sizeof(struct sctp_paddrthlds))
6869 len = sizeof(struct sctp_paddrthlds);
6870 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6873 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6874 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6878 val.spt_pathpfthld = asoc->pf_retrans;
6879 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6881 trans = sctp_addr_id2transport(sk, &val.spt_address,
6886 val.spt_pathmaxrxt = trans->pathmaxrxt;
6887 val.spt_pathpfthld = trans->pf_retrans;
6890 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6897 * SCTP_GET_ASSOC_STATS
6899 * This option retrieves local per endpoint statistics. It is modeled
6900 * after OpenSolaris' implementation
6902 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6903 char __user *optval,
6906 struct sctp_assoc_stats sas;
6907 struct sctp_association *asoc = NULL;
6909 /* User must provide at least the assoc id */
6910 if (len < sizeof(sctp_assoc_t))
6913 /* Allow the struct to grow and fill in as much as possible */
6914 len = min_t(size_t, len, sizeof(sas));
6916 if (copy_from_user(&sas, optval, len))
6919 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6923 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6924 sas.sas_gapcnt = asoc->stats.gapcnt;
6925 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6926 sas.sas_osacks = asoc->stats.osacks;
6927 sas.sas_isacks = asoc->stats.isacks;
6928 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6929 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6930 sas.sas_oodchunks = asoc->stats.oodchunks;
6931 sas.sas_iodchunks = asoc->stats.iodchunks;
6932 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6933 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6934 sas.sas_idupchunks = asoc->stats.idupchunks;
6935 sas.sas_opackets = asoc->stats.opackets;
6936 sas.sas_ipackets = asoc->stats.ipackets;
6938 /* New high max rto observed, will return 0 if not a single
6939 * RTO update took place. obs_rto_ipaddr will be bogus
6942 sas.sas_maxrto = asoc->stats.max_obs_rto;
6943 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6944 sizeof(struct sockaddr_storage));
6946 /* Mark beginning of a new observation period */
6947 asoc->stats.max_obs_rto = asoc->rto_min;
6949 if (put_user(len, optlen))
6952 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6954 if (copy_to_user(optval, &sas, len))
6960 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6961 char __user *optval,
6966 if (len < sizeof(int))
6970 if (sctp_sk(sk)->recvrcvinfo)
6972 if (put_user(len, optlen))
6974 if (copy_to_user(optval, &val, len))
6980 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6981 char __user *optval,
6986 if (len < sizeof(int))
6990 if (sctp_sk(sk)->recvnxtinfo)
6992 if (put_user(len, optlen))
6994 if (copy_to_user(optval, &val, len))
7000 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7001 char __user *optval,
7004 struct sctp_assoc_value params;
7005 struct sctp_association *asoc;
7006 int retval = -EFAULT;
7008 if (len < sizeof(params)) {
7013 len = sizeof(params);
7014 if (copy_from_user(¶ms, optval, len))
7017 asoc = sctp_id2assoc(sk, params.assoc_id);
7019 params.assoc_value = asoc->prsctp_enable;
7020 } else if (!params.assoc_id) {
7021 struct sctp_sock *sp = sctp_sk(sk);
7023 params.assoc_value = sp->ep->prsctp_enable;
7029 if (put_user(len, optlen))
7032 if (copy_to_user(optval, ¶ms, len))
7041 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7042 char __user *optval,
7045 struct sctp_default_prinfo info;
7046 struct sctp_association *asoc;
7047 int retval = -EFAULT;
7049 if (len < sizeof(info)) {
7055 if (copy_from_user(&info, optval, len))
7058 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7060 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7061 info.pr_value = asoc->default_timetolive;
7062 } else if (!info.pr_assoc_id) {
7063 struct sctp_sock *sp = sctp_sk(sk);
7065 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7066 info.pr_value = sp->default_timetolive;
7072 if (put_user(len, optlen))
7075 if (copy_to_user(optval, &info, len))
7084 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7085 char __user *optval,
7088 struct sctp_prstatus params;
7089 struct sctp_association *asoc;
7091 int retval = -EINVAL;
7093 if (len < sizeof(params))
7096 len = sizeof(params);
7097 if (copy_from_user(¶ms, optval, len)) {
7102 policy = params.sprstat_policy;
7103 if (policy & ~SCTP_PR_SCTP_MASK)
7106 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7110 if (policy == SCTP_PR_SCTP_NONE) {
7111 params.sprstat_abandoned_unsent = 0;
7112 params.sprstat_abandoned_sent = 0;
7113 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7114 params.sprstat_abandoned_unsent +=
7115 asoc->abandoned_unsent[policy];
7116 params.sprstat_abandoned_sent +=
7117 asoc->abandoned_sent[policy];
7120 params.sprstat_abandoned_unsent =
7121 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7122 params.sprstat_abandoned_sent =
7123 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7126 if (put_user(len, optlen)) {
7131 if (copy_to_user(optval, ¶ms, len)) {
7142 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7143 char __user *optval,
7146 struct sctp_stream_out_ext *streamoute;
7147 struct sctp_association *asoc;
7148 struct sctp_prstatus params;
7149 int retval = -EINVAL;
7152 if (len < sizeof(params))
7155 len = sizeof(params);
7156 if (copy_from_user(¶ms, optval, len)) {
7161 policy = params.sprstat_policy;
7162 if (policy & ~SCTP_PR_SCTP_MASK)
7165 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7166 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7169 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7171 /* Not allocated yet, means all stats are 0 */
7172 params.sprstat_abandoned_unsent = 0;
7173 params.sprstat_abandoned_sent = 0;
7178 if (policy == SCTP_PR_SCTP_NONE) {
7179 params.sprstat_abandoned_unsent = 0;
7180 params.sprstat_abandoned_sent = 0;
7181 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7182 params.sprstat_abandoned_unsent +=
7183 streamoute->abandoned_unsent[policy];
7184 params.sprstat_abandoned_sent +=
7185 streamoute->abandoned_sent[policy];
7188 params.sprstat_abandoned_unsent =
7189 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7190 params.sprstat_abandoned_sent =
7191 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7194 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7205 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7206 char __user *optval,
7209 struct sctp_assoc_value params;
7210 struct sctp_association *asoc;
7211 int retval = -EFAULT;
7213 if (len < sizeof(params)) {
7218 len = sizeof(params);
7219 if (copy_from_user(¶ms, optval, len))
7222 asoc = sctp_id2assoc(sk, params.assoc_id);
7224 params.assoc_value = asoc->reconf_enable;
7225 } else if (!params.assoc_id) {
7226 struct sctp_sock *sp = sctp_sk(sk);
7228 params.assoc_value = sp->ep->reconf_enable;
7234 if (put_user(len, optlen))
7237 if (copy_to_user(optval, ¶ms, len))
7246 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7247 char __user *optval,
7250 struct sctp_assoc_value params;
7251 struct sctp_association *asoc;
7252 int retval = -EFAULT;
7254 if (len < sizeof(params)) {
7259 len = sizeof(params);
7260 if (copy_from_user(¶ms, optval, len))
7263 asoc = sctp_id2assoc(sk, params.assoc_id);
7265 params.assoc_value = asoc->strreset_enable;
7266 } else if (!params.assoc_id) {
7267 struct sctp_sock *sp = sctp_sk(sk);
7269 params.assoc_value = sp->ep->strreset_enable;
7275 if (put_user(len, optlen))
7278 if (copy_to_user(optval, ¶ms, len))
7287 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7288 char __user *optval,
7291 struct sctp_assoc_value params;
7292 struct sctp_association *asoc;
7293 int retval = -EFAULT;
7295 if (len < sizeof(params)) {
7300 len = sizeof(params);
7301 if (copy_from_user(¶ms, optval, len))
7304 asoc = sctp_id2assoc(sk, params.assoc_id);
7310 params.assoc_value = sctp_sched_get_sched(asoc);
7312 if (put_user(len, optlen))
7315 if (copy_to_user(optval, ¶ms, len))
7324 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7325 char __user *optval,
7328 struct sctp_stream_value params;
7329 struct sctp_association *asoc;
7330 int retval = -EFAULT;
7332 if (len < sizeof(params)) {
7337 len = sizeof(params);
7338 if (copy_from_user(¶ms, optval, len))
7341 asoc = sctp_id2assoc(sk, params.assoc_id);
7347 retval = sctp_sched_get_value(asoc, params.stream_id,
7348 ¶ms.stream_value);
7352 if (put_user(len, optlen)) {
7357 if (copy_to_user(optval, ¶ms, len)) {
7366 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7367 char __user *optval,
7370 struct sctp_assoc_value params;
7371 struct sctp_association *asoc;
7372 int retval = -EFAULT;
7374 if (len < sizeof(params)) {
7379 len = sizeof(params);
7380 if (copy_from_user(¶ms, optval, len))
7383 asoc = sctp_id2assoc(sk, params.assoc_id);
7385 params.assoc_value = asoc->intl_enable;
7386 } else if (!params.assoc_id) {
7387 struct sctp_sock *sp = sctp_sk(sk);
7389 params.assoc_value = sp->strm_interleave;
7395 if (put_user(len, optlen))
7398 if (copy_to_user(optval, ¶ms, len))
7407 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7408 char __user *optval,
7413 if (len < sizeof(int))
7417 val = sctp_sk(sk)->reuse;
7418 if (put_user(len, optlen))
7421 if (copy_to_user(optval, &val, len))
7427 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7428 char __user *optval, int __user *optlen)
7433 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7435 /* I can hardly begin to describe how wrong this is. This is
7436 * so broken as to be worse than useless. The API draft
7437 * REALLY is NOT helpful here... I am not convinced that the
7438 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7439 * are at all well-founded.
7441 if (level != SOL_SCTP) {
7442 struct sctp_af *af = sctp_sk(sk)->pf->af;
7444 retval = af->getsockopt(sk, level, optname, optval, optlen);
7448 if (get_user(len, optlen))
7458 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7460 case SCTP_DISABLE_FRAGMENTS:
7461 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7465 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7467 case SCTP_AUTOCLOSE:
7468 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7470 case SCTP_SOCKOPT_PEELOFF:
7471 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7473 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7474 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7476 case SCTP_PEER_ADDR_PARAMS:
7477 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7480 case SCTP_DELAYED_SACK:
7481 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7485 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7487 case SCTP_GET_PEER_ADDRS:
7488 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7491 case SCTP_GET_LOCAL_ADDRS:
7492 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7495 case SCTP_SOCKOPT_CONNECTX3:
7496 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7498 case SCTP_DEFAULT_SEND_PARAM:
7499 retval = sctp_getsockopt_default_send_param(sk, len,
7502 case SCTP_DEFAULT_SNDINFO:
7503 retval = sctp_getsockopt_default_sndinfo(sk, len,
7506 case SCTP_PRIMARY_ADDR:
7507 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7510 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7513 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7515 case SCTP_ASSOCINFO:
7516 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7518 case SCTP_I_WANT_MAPPED_V4_ADDR:
7519 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7522 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7524 case SCTP_GET_PEER_ADDR_INFO:
7525 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7528 case SCTP_ADAPTATION_LAYER:
7529 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7533 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7535 case SCTP_FRAGMENT_INTERLEAVE:
7536 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7539 case SCTP_PARTIAL_DELIVERY_POINT:
7540 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7543 case SCTP_MAX_BURST:
7544 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7547 case SCTP_AUTH_CHUNK:
7548 case SCTP_AUTH_DELETE_KEY:
7549 case SCTP_AUTH_DEACTIVATE_KEY:
7550 retval = -EOPNOTSUPP;
7552 case SCTP_HMAC_IDENT:
7553 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7555 case SCTP_AUTH_ACTIVE_KEY:
7556 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7558 case SCTP_PEER_AUTH_CHUNKS:
7559 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7562 case SCTP_LOCAL_AUTH_CHUNKS:
7563 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7566 case SCTP_GET_ASSOC_NUMBER:
7567 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7569 case SCTP_GET_ASSOC_ID_LIST:
7570 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7572 case SCTP_AUTO_ASCONF:
7573 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7575 case SCTP_PEER_ADDR_THLDS:
7576 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7578 case SCTP_GET_ASSOC_STATS:
7579 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7581 case SCTP_RECVRCVINFO:
7582 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7584 case SCTP_RECVNXTINFO:
7585 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7587 case SCTP_PR_SUPPORTED:
7588 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7590 case SCTP_DEFAULT_PRINFO:
7591 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7594 case SCTP_PR_ASSOC_STATUS:
7595 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7598 case SCTP_PR_STREAM_STATUS:
7599 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7602 case SCTP_RECONFIG_SUPPORTED:
7603 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7606 case SCTP_ENABLE_STREAM_RESET:
7607 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7610 case SCTP_STREAM_SCHEDULER:
7611 retval = sctp_getsockopt_scheduler(sk, len, optval,
7614 case SCTP_STREAM_SCHEDULER_VALUE:
7615 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7618 case SCTP_INTERLEAVING_SUPPORTED:
7619 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7622 case SCTP_REUSE_PORT:
7623 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
7626 retval = -ENOPROTOOPT;
7634 static int sctp_hash(struct sock *sk)
7640 static void sctp_unhash(struct sock *sk)
7645 /* Check if port is acceptable. Possibly find first available port.
7647 * The port hash table (contained in the 'global' SCTP protocol storage
7648 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7649 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7650 * list (the list number is the port number hashed out, so as you
7651 * would expect from a hash function, all the ports in a given list have
7652 * such a number that hashes out to the same list number; you were
7653 * expecting that, right?); so each list has a set of ports, with a
7654 * link to the socket (struct sock) that uses it, the port number and
7655 * a fastreuse flag (FIXME: NPI ipg).
7657 static struct sctp_bind_bucket *sctp_bucket_create(
7658 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7660 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7662 bool reuse = (sk->sk_reuse || sctp_sk(sk)->reuse);
7663 struct sctp_bind_hashbucket *head; /* hash list */
7664 struct sctp_bind_bucket *pp;
7665 unsigned short snum;
7668 snum = ntohs(addr->v4.sin_port);
7670 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7675 /* Search for an available port. */
7676 int low, high, remaining, index;
7678 struct net *net = sock_net(sk);
7680 inet_get_local_port_range(net, &low, &high);
7681 remaining = (high - low) + 1;
7682 rover = prandom_u32() % remaining + low;
7686 if ((rover < low) || (rover > high))
7688 if (inet_is_local_reserved_port(net, rover))
7690 index = sctp_phashfn(sock_net(sk), rover);
7691 head = &sctp_port_hashtable[index];
7692 spin_lock(&head->lock);
7693 sctp_for_each_hentry(pp, &head->chain)
7694 if ((pp->port == rover) &&
7695 net_eq(sock_net(sk), pp->net))
7699 spin_unlock(&head->lock);
7700 } while (--remaining > 0);
7702 /* Exhausted local port range during search? */
7707 /* OK, here is the one we will use. HEAD (the port
7708 * hash table list entry) is non-NULL and we hold it's
7713 /* We are given an specific port number; we verify
7714 * that it is not being used. If it is used, we will
7715 * exahust the search in the hash list corresponding
7716 * to the port number (snum) - we detect that with the
7717 * port iterator, pp being NULL.
7719 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7720 spin_lock(&head->lock);
7721 sctp_for_each_hentry(pp, &head->chain) {
7722 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7729 if (!hlist_empty(&pp->owner)) {
7730 /* We had a port hash table hit - there is an
7731 * available port (pp != NULL) and it is being
7732 * used by other socket (pp->owner not empty); that other
7733 * socket is going to be sk2.
7737 pr_debug("%s: found a possible match\n", __func__);
7739 if (pp->fastreuse && reuse && sk->sk_state != SCTP_SS_LISTENING)
7742 /* Run through the list of sockets bound to the port
7743 * (pp->port) [via the pointers bind_next and
7744 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7745 * we get the endpoint they describe and run through
7746 * the endpoint's list of IP (v4 or v6) addresses,
7747 * comparing each of the addresses with the address of
7748 * the socket sk. If we find a match, then that means
7749 * that this port/socket (sk) combination are already
7752 sk_for_each_bound(sk2, &pp->owner) {
7753 struct sctp_endpoint *ep2;
7754 ep2 = sctp_sk(sk2)->ep;
7757 (reuse && (sk2->sk_reuse || sctp_sk(sk2)->reuse) &&
7758 sk2->sk_state != SCTP_SS_LISTENING))
7761 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7762 sctp_sk(sk2), sctp_sk(sk))) {
7768 pr_debug("%s: found a match\n", __func__);
7771 /* If there was a hash table miss, create a new port. */
7773 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7776 /* In either case (hit or miss), make sure fastreuse is 1 only
7777 * if sk->sk_reuse is too (that is, if the caller requested
7778 * SO_REUSEADDR on this socket -sk-).
7780 if (hlist_empty(&pp->owner)) {
7781 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
7785 } else if (pp->fastreuse &&
7786 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
7789 /* We are set, so fill up all the data in the hash table
7790 * entry, tie the socket list information with the rest of the
7791 * sockets FIXME: Blurry, NPI (ipg).
7794 if (!sctp_sk(sk)->bind_hash) {
7795 inet_sk(sk)->inet_num = snum;
7796 sk_add_bind_node(sk, &pp->owner);
7797 sctp_sk(sk)->bind_hash = pp;
7802 spin_unlock(&head->lock);
7809 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7810 * port is requested.
7812 static int sctp_get_port(struct sock *sk, unsigned short snum)
7814 union sctp_addr addr;
7815 struct sctp_af *af = sctp_sk(sk)->pf->af;
7817 /* Set up a dummy address struct from the sk. */
7818 af->from_sk(&addr, sk);
7819 addr.v4.sin_port = htons(snum);
7821 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7822 return !!sctp_get_port_local(sk, &addr);
7826 * Move a socket to LISTENING state.
7828 static int sctp_listen_start(struct sock *sk, int backlog)
7830 struct sctp_sock *sp = sctp_sk(sk);
7831 struct sctp_endpoint *ep = sp->ep;
7832 struct crypto_shash *tfm = NULL;
7835 /* Allocate HMAC for generating cookie. */
7836 if (!sp->hmac && sp->sctp_hmac_alg) {
7837 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7838 tfm = crypto_alloc_shash(alg, 0, 0);
7840 net_info_ratelimited("failed to load transform for %s: %ld\n",
7841 sp->sctp_hmac_alg, PTR_ERR(tfm));
7844 sctp_sk(sk)->hmac = tfm;
7848 * If a bind() or sctp_bindx() is not called prior to a listen()
7849 * call that allows new associations to be accepted, the system
7850 * picks an ephemeral port and will choose an address set equivalent
7851 * to binding with a wildcard address.
7853 * This is not currently spelled out in the SCTP sockets
7854 * extensions draft, but follows the practice as seen in TCP
7858 inet_sk_set_state(sk, SCTP_SS_LISTENING);
7859 if (!ep->base.bind_addr.port) {
7860 if (sctp_autobind(sk))
7863 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7864 inet_sk_set_state(sk, SCTP_SS_CLOSED);
7869 sk->sk_max_ack_backlog = backlog;
7870 sctp_hash_endpoint(ep);
7875 * 4.1.3 / 5.1.3 listen()
7877 * By default, new associations are not accepted for UDP style sockets.
7878 * An application uses listen() to mark a socket as being able to
7879 * accept new associations.
7881 * On TCP style sockets, applications use listen() to ready the SCTP
7882 * endpoint for accepting inbound associations.
7884 * On both types of endpoints a backlog of '0' disables listening.
7886 * Move a socket to LISTENING state.
7888 int sctp_inet_listen(struct socket *sock, int backlog)
7890 struct sock *sk = sock->sk;
7891 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7894 if (unlikely(backlog < 0))
7899 /* Peeled-off sockets are not allowed to listen(). */
7900 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7903 if (sock->state != SS_UNCONNECTED)
7906 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7909 /* If backlog is zero, disable listening. */
7911 if (sctp_sstate(sk, CLOSED))
7915 sctp_unhash_endpoint(ep);
7916 sk->sk_state = SCTP_SS_CLOSED;
7917 if (sk->sk_reuse || sctp_sk(sk)->reuse)
7918 sctp_sk(sk)->bind_hash->fastreuse = 1;
7922 /* If we are already listening, just update the backlog */
7923 if (sctp_sstate(sk, LISTENING))
7924 sk->sk_max_ack_backlog = backlog;
7926 err = sctp_listen_start(sk, backlog);
7938 * This function is done by modeling the current datagram_poll() and the
7939 * tcp_poll(). Note that, based on these implementations, we don't
7940 * lock the socket in this function, even though it seems that,
7941 * ideally, locking or some other mechanisms can be used to ensure
7942 * the integrity of the counters (sndbuf and wmem_alloc) used
7943 * in this place. We assume that we don't need locks either until proven
7946 * Another thing to note is that we include the Async I/O support
7947 * here, again, by modeling the current TCP/UDP code. We don't have
7948 * a good way to test with it yet.
7950 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7952 struct sock *sk = sock->sk;
7953 struct sctp_sock *sp = sctp_sk(sk);
7956 poll_wait(file, sk_sleep(sk), wait);
7958 sock_rps_record_flow(sk);
7960 /* A TCP-style listening socket becomes readable when the accept queue
7963 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7964 return (!list_empty(&sp->ep->asocs)) ?
7965 (EPOLLIN | EPOLLRDNORM) : 0;
7969 /* Is there any exceptional events? */
7970 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7972 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
7973 if (sk->sk_shutdown & RCV_SHUTDOWN)
7974 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
7975 if (sk->sk_shutdown == SHUTDOWN_MASK)
7978 /* Is it readable? Reconsider this code with TCP-style support. */
7979 if (!skb_queue_empty(&sk->sk_receive_queue))
7980 mask |= EPOLLIN | EPOLLRDNORM;
7982 /* The association is either gone or not ready. */
7983 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7986 /* Is it writable? */
7987 if (sctp_writeable(sk)) {
7988 mask |= EPOLLOUT | EPOLLWRNORM;
7990 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7992 * Since the socket is not locked, the buffer
7993 * might be made available after the writeable check and
7994 * before the bit is set. This could cause a lost I/O
7995 * signal. tcp_poll() has a race breaker for this race
7996 * condition. Based on their implementation, we put
7997 * in the following code to cover it as well.
7999 if (sctp_writeable(sk))
8000 mask |= EPOLLOUT | EPOLLWRNORM;
8005 /********************************************************************
8006 * 2nd Level Abstractions
8007 ********************************************************************/
8009 static struct sctp_bind_bucket *sctp_bucket_create(
8010 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8012 struct sctp_bind_bucket *pp;
8014 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8016 SCTP_DBG_OBJCNT_INC(bind_bucket);
8019 INIT_HLIST_HEAD(&pp->owner);
8021 hlist_add_head(&pp->node, &head->chain);
8026 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8027 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8029 if (pp && hlist_empty(&pp->owner)) {
8030 __hlist_del(&pp->node);
8031 kmem_cache_free(sctp_bucket_cachep, pp);
8032 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8036 /* Release this socket's reference to a local port. */
8037 static inline void __sctp_put_port(struct sock *sk)
8039 struct sctp_bind_hashbucket *head =
8040 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8041 inet_sk(sk)->inet_num)];
8042 struct sctp_bind_bucket *pp;
8044 spin_lock(&head->lock);
8045 pp = sctp_sk(sk)->bind_hash;
8046 __sk_del_bind_node(sk);
8047 sctp_sk(sk)->bind_hash = NULL;
8048 inet_sk(sk)->inet_num = 0;
8049 sctp_bucket_destroy(pp);
8050 spin_unlock(&head->lock);
8053 void sctp_put_port(struct sock *sk)
8056 __sctp_put_port(sk);
8061 * The system picks an ephemeral port and choose an address set equivalent
8062 * to binding with a wildcard address.
8063 * One of those addresses will be the primary address for the association.
8064 * This automatically enables the multihoming capability of SCTP.
8066 static int sctp_autobind(struct sock *sk)
8068 union sctp_addr autoaddr;
8072 /* Initialize a local sockaddr structure to INADDR_ANY. */
8073 af = sctp_sk(sk)->pf->af;
8075 port = htons(inet_sk(sk)->inet_num);
8076 af->inaddr_any(&autoaddr, port);
8078 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8081 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8084 * 4.2 The cmsghdr Structure *
8086 * When ancillary data is sent or received, any number of ancillary data
8087 * objects can be specified by the msg_control and msg_controllen members of
8088 * the msghdr structure, because each object is preceded by
8089 * a cmsghdr structure defining the object's length (the cmsg_len member).
8090 * Historically Berkeley-derived implementations have passed only one object
8091 * at a time, but this API allows multiple objects to be
8092 * passed in a single call to sendmsg() or recvmsg(). The following example
8093 * shows two ancillary data objects in a control buffer.
8095 * |<--------------------------- msg_controllen -------------------------->|
8098 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8100 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8103 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8105 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8108 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8109 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8111 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8113 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8120 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8122 struct msghdr *my_msg = (struct msghdr *)msg;
8123 struct cmsghdr *cmsg;
8125 for_each_cmsghdr(cmsg, my_msg) {
8126 if (!CMSG_OK(my_msg, cmsg))
8129 /* Should we parse this header or ignore? */
8130 if (cmsg->cmsg_level != IPPROTO_SCTP)
8133 /* Strictly check lengths following example in SCM code. */
8134 switch (cmsg->cmsg_type) {
8136 /* SCTP Socket API Extension
8137 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8139 * This cmsghdr structure provides information for
8140 * initializing new SCTP associations with sendmsg().
8141 * The SCTP_INITMSG socket option uses this same data
8142 * structure. This structure is not used for
8145 * cmsg_level cmsg_type cmsg_data[]
8146 * ------------ ------------ ----------------------
8147 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8149 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8152 cmsgs->init = CMSG_DATA(cmsg);
8156 /* SCTP Socket API Extension
8157 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8159 * This cmsghdr structure specifies SCTP options for
8160 * sendmsg() and describes SCTP header information
8161 * about a received message through recvmsg().
8163 * cmsg_level cmsg_type cmsg_data[]
8164 * ------------ ------------ ----------------------
8165 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8167 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8170 cmsgs->srinfo = CMSG_DATA(cmsg);
8172 if (cmsgs->srinfo->sinfo_flags &
8173 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8174 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8175 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8180 /* SCTP Socket API Extension
8181 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8183 * This cmsghdr structure specifies SCTP options for
8184 * sendmsg(). This structure and SCTP_RCVINFO replaces
8185 * SCTP_SNDRCV which has been deprecated.
8187 * cmsg_level cmsg_type cmsg_data[]
8188 * ------------ ------------ ---------------------
8189 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8191 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8194 cmsgs->sinfo = CMSG_DATA(cmsg);
8196 if (cmsgs->sinfo->snd_flags &
8197 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8198 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8199 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8203 /* SCTP Socket API Extension
8204 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8206 * This cmsghdr structure specifies SCTP options for sendmsg().
8208 * cmsg_level cmsg_type cmsg_data[]
8209 * ------------ ------------ ---------------------
8210 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8212 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8215 cmsgs->prinfo = CMSG_DATA(cmsg);
8216 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8219 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8220 cmsgs->prinfo->pr_value = 0;
8223 /* SCTP Socket API Extension
8224 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8226 * This cmsghdr structure specifies SCTP options for sendmsg().
8228 * cmsg_level cmsg_type cmsg_data[]
8229 * ------------ ------------ ---------------------
8230 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8232 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8235 cmsgs->authinfo = CMSG_DATA(cmsg);
8237 case SCTP_DSTADDRV4:
8238 case SCTP_DSTADDRV6:
8239 /* SCTP Socket API Extension
8240 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8242 * This cmsghdr structure specifies SCTP options for sendmsg().
8244 * cmsg_level cmsg_type cmsg_data[]
8245 * ------------ ------------ ---------------------
8246 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8247 * ------------ ------------ ---------------------
8248 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8250 cmsgs->addrs_msg = my_msg;
8261 * Wait for a packet..
8262 * Note: This function is the same function as in core/datagram.c
8263 * with a few modifications to make lksctp work.
8265 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8270 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8272 /* Socket errors? */
8273 error = sock_error(sk);
8277 if (!skb_queue_empty(&sk->sk_receive_queue))
8280 /* Socket shut down? */
8281 if (sk->sk_shutdown & RCV_SHUTDOWN)
8284 /* Sequenced packets can come disconnected. If so we report the
8289 /* Is there a good reason to think that we may receive some data? */
8290 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8293 /* Handle signals. */
8294 if (signal_pending(current))
8297 /* Let another process have a go. Since we are going to sleep
8298 * anyway. Note: This may cause odd behaviors if the message
8299 * does not fit in the user's buffer, but this seems to be the
8300 * only way to honor MSG_DONTWAIT realistically.
8303 *timeo_p = schedule_timeout(*timeo_p);
8307 finish_wait(sk_sleep(sk), &wait);
8311 error = sock_intr_errno(*timeo_p);
8314 finish_wait(sk_sleep(sk), &wait);
8319 /* Receive a datagram.
8320 * Note: This is pretty much the same routine as in core/datagram.c
8321 * with a few changes to make lksctp work.
8323 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8324 int noblock, int *err)
8327 struct sk_buff *skb;
8330 timeo = sock_rcvtimeo(sk, noblock);
8332 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8333 MAX_SCHEDULE_TIMEOUT);
8336 /* Again only user level code calls this function,
8337 * so nothing interrupt level
8338 * will suddenly eat the receive_queue.
8340 * Look at current nfs client by the way...
8341 * However, this function was correct in any case. 8)
8343 if (flags & MSG_PEEK) {
8344 skb = skb_peek(&sk->sk_receive_queue);
8346 refcount_inc(&skb->users);
8348 skb = __skb_dequeue(&sk->sk_receive_queue);
8354 /* Caller is allowed not to check sk->sk_err before calling. */
8355 error = sock_error(sk);
8359 if (sk->sk_shutdown & RCV_SHUTDOWN)
8362 if (sk_can_busy_loop(sk)) {
8363 sk_busy_loop(sk, noblock);
8365 if (!skb_queue_empty(&sk->sk_receive_queue))
8369 /* User doesn't want to wait. */
8373 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8382 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8383 static void __sctp_write_space(struct sctp_association *asoc)
8385 struct sock *sk = asoc->base.sk;
8387 if (sctp_wspace(asoc) <= 0)
8390 if (waitqueue_active(&asoc->wait))
8391 wake_up_interruptible(&asoc->wait);
8393 if (sctp_writeable(sk)) {
8394 struct socket_wq *wq;
8397 wq = rcu_dereference(sk->sk_wq);
8399 if (waitqueue_active(&wq->wait))
8400 wake_up_interruptible(&wq->wait);
8402 /* Note that we try to include the Async I/O support
8403 * here by modeling from the current TCP/UDP code.
8404 * We have not tested with it yet.
8406 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8407 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8413 static void sctp_wake_up_waiters(struct sock *sk,
8414 struct sctp_association *asoc)
8416 struct sctp_association *tmp = asoc;
8418 /* We do accounting for the sndbuf space per association,
8419 * so we only need to wake our own association.
8421 if (asoc->ep->sndbuf_policy)
8422 return __sctp_write_space(asoc);
8424 /* If association goes down and is just flushing its
8425 * outq, then just normally notify others.
8427 if (asoc->base.dead)
8428 return sctp_write_space(sk);
8430 /* Accounting for the sndbuf space is per socket, so we
8431 * need to wake up others, try to be fair and in case of
8432 * other associations, let them have a go first instead
8433 * of just doing a sctp_write_space() call.
8435 * Note that we reach sctp_wake_up_waiters() only when
8436 * associations free up queued chunks, thus we are under
8437 * lock and the list of associations on a socket is
8438 * guaranteed not to change.
8440 for (tmp = list_next_entry(tmp, asocs); 1;
8441 tmp = list_next_entry(tmp, asocs)) {
8442 /* Manually skip the head element. */
8443 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8445 /* Wake up association. */
8446 __sctp_write_space(tmp);
8447 /* We've reached the end. */
8453 /* Do accounting for the sndbuf space.
8454 * Decrement the used sndbuf space of the corresponding association by the
8455 * data size which was just transmitted(freed).
8457 static void sctp_wfree(struct sk_buff *skb)
8459 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8460 struct sctp_association *asoc = chunk->asoc;
8461 struct sock *sk = asoc->base.sk;
8463 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
8464 sizeof(struct sk_buff) +
8465 sizeof(struct sctp_chunk);
8467 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
8470 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
8472 sk->sk_wmem_queued -= skb->truesize;
8473 sk_mem_uncharge(sk, skb->truesize);
8476 struct sctp_shared_key *shkey = chunk->shkey;
8478 /* refcnt == 2 and !list_empty mean after this release, it's
8479 * not being used anywhere, and it's time to notify userland
8480 * that this shkey can be freed if it's been deactivated.
8482 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8483 refcount_read(&shkey->refcnt) == 2) {
8484 struct sctp_ulpevent *ev;
8486 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8490 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8492 sctp_auth_shkey_release(chunk->shkey);
8496 sctp_wake_up_waiters(sk, asoc);
8498 sctp_association_put(asoc);
8501 /* Do accounting for the receive space on the socket.
8502 * Accounting for the association is done in ulpevent.c
8503 * We set this as a destructor for the cloned data skbs so that
8504 * accounting is done at the correct time.
8506 void sctp_sock_rfree(struct sk_buff *skb)
8508 struct sock *sk = skb->sk;
8509 struct sctp_ulpevent *event = sctp_skb2event(skb);
8511 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8514 * Mimic the behavior of sock_rfree
8516 sk_mem_uncharge(sk, event->rmem_len);
8520 /* Helper function to wait for space in the sndbuf. */
8521 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8524 struct sock *sk = asoc->base.sk;
8525 long current_timeo = *timeo_p;
8529 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8532 /* Increment the association's refcnt. */
8533 sctp_association_hold(asoc);
8535 /* Wait on the association specific sndbuf space. */
8537 prepare_to_wait_exclusive(&asoc->wait, &wait,
8538 TASK_INTERRUPTIBLE);
8539 if (asoc->base.dead)
8543 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8545 if (signal_pending(current))
8546 goto do_interrupted;
8547 if (msg_len <= sctp_wspace(asoc))
8550 /* Let another process have a go. Since we are going
8554 current_timeo = schedule_timeout(current_timeo);
8556 if (sk != asoc->base.sk)
8559 *timeo_p = current_timeo;
8563 finish_wait(&asoc->wait, &wait);
8565 /* Release the association's refcnt. */
8566 sctp_association_put(asoc);
8579 err = sock_intr_errno(*timeo_p);
8587 void sctp_data_ready(struct sock *sk)
8589 struct socket_wq *wq;
8592 wq = rcu_dereference(sk->sk_wq);
8593 if (skwq_has_sleeper(wq))
8594 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8595 EPOLLRDNORM | EPOLLRDBAND);
8596 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8600 /* If socket sndbuf has changed, wake up all per association waiters. */
8601 void sctp_write_space(struct sock *sk)
8603 struct sctp_association *asoc;
8605 /* Wake up the tasks in each wait queue. */
8606 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
8607 __sctp_write_space(asoc);
8611 /* Is there any sndbuf space available on the socket?
8613 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
8614 * associations on the same socket. For a UDP-style socket with
8615 * multiple associations, it is possible for it to be "unwriteable"
8616 * prematurely. I assume that this is acceptable because
8617 * a premature "unwriteable" is better than an accidental "writeable" which
8618 * would cause an unwanted block under certain circumstances. For the 1-1
8619 * UDP-style sockets or TCP-style sockets, this code should work.
8622 static int sctp_writeable(struct sock *sk)
8626 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
8632 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
8633 * returns immediately with EINPROGRESS.
8635 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
8637 struct sock *sk = asoc->base.sk;
8639 long current_timeo = *timeo_p;
8642 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
8644 /* Increment the association's refcnt. */
8645 sctp_association_hold(asoc);
8648 prepare_to_wait_exclusive(&asoc->wait, &wait,
8649 TASK_INTERRUPTIBLE);
8652 if (sk->sk_shutdown & RCV_SHUTDOWN)
8654 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
8657 if (signal_pending(current))
8658 goto do_interrupted;
8660 if (sctp_state(asoc, ESTABLISHED))
8663 /* Let another process have a go. Since we are going
8667 current_timeo = schedule_timeout(current_timeo);
8670 *timeo_p = current_timeo;
8674 finish_wait(&asoc->wait, &wait);
8676 /* Release the association's refcnt. */
8677 sctp_association_put(asoc);
8682 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
8685 err = -ECONNREFUSED;
8689 err = sock_intr_errno(*timeo_p);
8697 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8699 struct sctp_endpoint *ep;
8703 ep = sctp_sk(sk)->ep;
8707 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8708 TASK_INTERRUPTIBLE);
8710 if (list_empty(&ep->asocs)) {
8712 timeo = schedule_timeout(timeo);
8717 if (!sctp_sstate(sk, LISTENING))
8721 if (!list_empty(&ep->asocs))
8724 err = sock_intr_errno(timeo);
8725 if (signal_pending(current))
8733 finish_wait(sk_sleep(sk), &wait);
8738 static void sctp_wait_for_close(struct sock *sk, long timeout)
8743 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8744 if (list_empty(&sctp_sk(sk)->ep->asocs))
8747 timeout = schedule_timeout(timeout);
8749 } while (!signal_pending(current) && timeout);
8751 finish_wait(sk_sleep(sk), &wait);
8754 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8756 struct sk_buff *frag;
8761 /* Don't forget the fragments. */
8762 skb_walk_frags(skb, frag)
8763 sctp_skb_set_owner_r_frag(frag, sk);
8766 sctp_skb_set_owner_r(skb, sk);
8769 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8770 struct sctp_association *asoc)
8772 struct inet_sock *inet = inet_sk(sk);
8773 struct inet_sock *newinet;
8774 struct sctp_sock *sp = sctp_sk(sk);
8775 struct sctp_endpoint *ep = sp->ep;
8777 newsk->sk_type = sk->sk_type;
8778 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8779 newsk->sk_flags = sk->sk_flags;
8780 newsk->sk_tsflags = sk->sk_tsflags;
8781 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8782 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8783 newsk->sk_reuse = sk->sk_reuse;
8784 sctp_sk(newsk)->reuse = sp->reuse;
8786 newsk->sk_shutdown = sk->sk_shutdown;
8787 newsk->sk_destruct = sctp_destruct_sock;
8788 newsk->sk_family = sk->sk_family;
8789 newsk->sk_protocol = IPPROTO_SCTP;
8790 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8791 newsk->sk_sndbuf = sk->sk_sndbuf;
8792 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8793 newsk->sk_lingertime = sk->sk_lingertime;
8794 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8795 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8796 newsk->sk_rxhash = sk->sk_rxhash;
8798 newinet = inet_sk(newsk);
8800 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8801 * getsockname() and getpeername()
8803 newinet->inet_sport = inet->inet_sport;
8804 newinet->inet_saddr = inet->inet_saddr;
8805 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8806 newinet->inet_dport = htons(asoc->peer.port);
8807 newinet->pmtudisc = inet->pmtudisc;
8808 newinet->inet_id = asoc->next_tsn ^ jiffies;
8810 newinet->uc_ttl = inet->uc_ttl;
8811 newinet->mc_loop = 1;
8812 newinet->mc_ttl = 1;
8813 newinet->mc_index = 0;
8814 newinet->mc_list = NULL;
8816 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8817 net_enable_timestamp();
8819 /* Set newsk security attributes from orginal sk and connection
8820 * security attribute from ep.
8822 security_sctp_sk_clone(ep, sk, newsk);
8825 static inline void sctp_copy_descendant(struct sock *sk_to,
8826 const struct sock *sk_from)
8828 int ancestor_size = sizeof(struct inet_sock) +
8829 sizeof(struct sctp_sock) -
8830 offsetof(struct sctp_sock, auto_asconf_list);
8832 if (sk_from->sk_family == PF_INET6)
8833 ancestor_size += sizeof(struct ipv6_pinfo);
8835 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8838 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8839 * and its messages to the newsk.
8841 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8842 struct sctp_association *assoc,
8843 enum sctp_socket_type type)
8845 struct sctp_sock *oldsp = sctp_sk(oldsk);
8846 struct sctp_sock *newsp = sctp_sk(newsk);
8847 struct sctp_bind_bucket *pp; /* hash list port iterator */
8848 struct sctp_endpoint *newep = newsp->ep;
8849 struct sk_buff *skb, *tmp;
8850 struct sctp_ulpevent *event;
8851 struct sctp_bind_hashbucket *head;
8853 /* Migrate socket buffer sizes and all the socket level options to the
8856 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8857 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8858 /* Brute force copy old sctp opt. */
8859 sctp_copy_descendant(newsk, oldsk);
8861 /* Restore the ep value that was overwritten with the above structure
8867 /* Hook this new socket in to the bind_hash list. */
8868 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8869 inet_sk(oldsk)->inet_num)];
8870 spin_lock_bh(&head->lock);
8871 pp = sctp_sk(oldsk)->bind_hash;
8872 sk_add_bind_node(newsk, &pp->owner);
8873 sctp_sk(newsk)->bind_hash = pp;
8874 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8875 spin_unlock_bh(&head->lock);
8877 /* Copy the bind_addr list from the original endpoint to the new
8878 * endpoint so that we can handle restarts properly
8880 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8881 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8883 /* Move any messages in the old socket's receive queue that are for the
8884 * peeled off association to the new socket's receive queue.
8886 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8887 event = sctp_skb2event(skb);
8888 if (event->asoc == assoc) {
8889 __skb_unlink(skb, &oldsk->sk_receive_queue);
8890 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8891 sctp_skb_set_owner_r_frag(skb, newsk);
8895 /* Clean up any messages pending delivery due to partial
8896 * delivery. Three cases:
8897 * 1) No partial deliver; no work.
8898 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8899 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8901 skb_queue_head_init(&newsp->pd_lobby);
8902 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8904 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8905 struct sk_buff_head *queue;
8907 /* Decide which queue to move pd_lobby skbs to. */
8908 if (assoc->ulpq.pd_mode) {
8909 queue = &newsp->pd_lobby;
8911 queue = &newsk->sk_receive_queue;
8913 /* Walk through the pd_lobby, looking for skbs that
8914 * need moved to the new socket.
8916 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8917 event = sctp_skb2event(skb);
8918 if (event->asoc == assoc) {
8919 __skb_unlink(skb, &oldsp->pd_lobby);
8920 __skb_queue_tail(queue, skb);
8921 sctp_skb_set_owner_r_frag(skb, newsk);
8925 /* Clear up any skbs waiting for the partial
8926 * delivery to finish.
8928 if (assoc->ulpq.pd_mode)
8929 sctp_clear_pd(oldsk, NULL);
8933 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8935 /* Set the type of socket to indicate that it is peeled off from the
8936 * original UDP-style socket or created with the accept() call on a
8937 * TCP-style socket..
8941 /* Mark the new socket "in-use" by the user so that any packets
8942 * that may arrive on the association after we've moved it are
8943 * queued to the backlog. This prevents a potential race between
8944 * backlog processing on the old socket and new-packet processing
8945 * on the new socket.
8947 * The caller has just allocated newsk so we can guarantee that other
8948 * paths won't try to lock it and then oldsk.
8950 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8951 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
8952 sctp_assoc_migrate(assoc, newsk);
8953 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
8955 /* If the association on the newsk is already closed before accept()
8956 * is called, set RCV_SHUTDOWN flag.
8958 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8959 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
8960 newsk->sk_shutdown |= RCV_SHUTDOWN;
8962 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8965 release_sock(newsk);
8969 /* This proto struct describes the ULP interface for SCTP. */
8970 struct proto sctp_prot = {
8972 .owner = THIS_MODULE,
8973 .close = sctp_close,
8974 .disconnect = sctp_disconnect,
8975 .accept = sctp_accept,
8976 .ioctl = sctp_ioctl,
8977 .init = sctp_init_sock,
8978 .destroy = sctp_destroy_sock,
8979 .shutdown = sctp_shutdown,
8980 .setsockopt = sctp_setsockopt,
8981 .getsockopt = sctp_getsockopt,
8982 .sendmsg = sctp_sendmsg,
8983 .recvmsg = sctp_recvmsg,
8985 .backlog_rcv = sctp_backlog_rcv,
8987 .unhash = sctp_unhash,
8988 .get_port = sctp_get_port,
8989 .obj_size = sizeof(struct sctp_sock),
8990 .useroffset = offsetof(struct sctp_sock, subscribe),
8991 .usersize = offsetof(struct sctp_sock, initmsg) -
8992 offsetof(struct sctp_sock, subscribe) +
8993 sizeof_field(struct sctp_sock, initmsg),
8994 .sysctl_mem = sysctl_sctp_mem,
8995 .sysctl_rmem = sysctl_sctp_rmem,
8996 .sysctl_wmem = sysctl_sctp_wmem,
8997 .memory_pressure = &sctp_memory_pressure,
8998 .enter_memory_pressure = sctp_enter_memory_pressure,
8999 .memory_allocated = &sctp_memory_allocated,
9000 .sockets_allocated = &sctp_sockets_allocated,
9003 #if IS_ENABLED(CONFIG_IPV6)
9005 #include <net/transp_v6.h>
9006 static void sctp_v6_destroy_sock(struct sock *sk)
9008 sctp_destroy_sock(sk);
9009 inet6_destroy_sock(sk);
9012 struct proto sctpv6_prot = {
9014 .owner = THIS_MODULE,
9015 .close = sctp_close,
9016 .disconnect = sctp_disconnect,
9017 .accept = sctp_accept,
9018 .ioctl = sctp_ioctl,
9019 .init = sctp_init_sock,
9020 .destroy = sctp_v6_destroy_sock,
9021 .shutdown = sctp_shutdown,
9022 .setsockopt = sctp_setsockopt,
9023 .getsockopt = sctp_getsockopt,
9024 .sendmsg = sctp_sendmsg,
9025 .recvmsg = sctp_recvmsg,
9027 .backlog_rcv = sctp_backlog_rcv,
9029 .unhash = sctp_unhash,
9030 .get_port = sctp_get_port,
9031 .obj_size = sizeof(struct sctp6_sock),
9032 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9033 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9034 offsetof(struct sctp6_sock, sctp.subscribe) +
9035 sizeof_field(struct sctp6_sock, sctp.initmsg),
9036 .sysctl_mem = sysctl_sctp_mem,
9037 .sysctl_rmem = sysctl_sctp_rmem,
9038 .sysctl_wmem = sysctl_sctp_wmem,
9039 .memory_pressure = &sctp_memory_pressure,
9040 .enter_memory_pressure = sctp_enter_memory_pressure,
9041 .memory_allocated = &sctp_memory_allocated,
9042 .sockets_allocated = &sctp_sockets_allocated,
9044 #endif /* IS_ENABLED(CONFIG_IPV6) */