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
36 * lksctp developers <linux-sctp@vger.kernel.org>
38 * Written or modified by:
39 * La Monte H.P. Yarroll <piggy@acm.org>
40 * Narasimha Budihal <narsi@refcode.org>
41 * Karl Knutson <karl@athena.chicago.il.us>
42 * Jon Grimm <jgrimm@us.ibm.com>
43 * Xingang Guo <xingang.guo@intel.com>
44 * Daisy Chang <daisyc@us.ibm.com>
45 * Sridhar Samudrala <samudrala@us.ibm.com>
46 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
47 * Ardelle Fan <ardelle.fan@intel.com>
48 * Ryan Layer <rmlayer@us.ibm.com>
49 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
50 * Kevin Gao <kevin.gao@intel.com>
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
72 #include <net/route.h>
74 #include <net/inet_common.h>
75 #include <net/busy_poll.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <linux/export.h>
80 #include <net/sctp/sctp.h>
81 #include <net/sctp/sm.h>
82 #include <net/sctp/stream_sched.h>
84 /* Forward declarations for internal helper functions. */
85 static int sctp_writeable(struct sock *sk);
86 static void sctp_wfree(struct sk_buff *skb);
87 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
89 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
90 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
91 static int sctp_wait_for_accept(struct sock *sk, long timeo);
92 static void sctp_wait_for_close(struct sock *sk, long timeo);
93 static void sctp_destruct_sock(struct sock *sk);
94 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
95 union sctp_addr *addr, int len);
96 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
97 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
98 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
99 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf(struct sctp_association *asoc,
101 struct sctp_chunk *chunk);
102 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
103 static int sctp_autobind(struct sock *sk);
104 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
105 struct sctp_association *assoc,
106 enum sctp_socket_type type);
108 static unsigned long sctp_memory_pressure;
109 static atomic_long_t sctp_memory_allocated;
110 struct percpu_counter sctp_sockets_allocated;
112 static void sctp_enter_memory_pressure(struct sock *sk)
114 sctp_memory_pressure = 1;
118 /* Get the sndbuf space available at the time on the association. */
119 static inline int sctp_wspace(struct sctp_association *asoc)
123 if (asoc->ep->sndbuf_policy)
124 amt = asoc->sndbuf_used;
126 amt = sk_wmem_alloc_get(asoc->base.sk);
128 if (amt >= asoc->base.sk->sk_sndbuf) {
129 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
132 amt = sk_stream_wspace(asoc->base.sk);
137 amt = asoc->base.sk->sk_sndbuf - amt;
142 /* Increment the used sndbuf space count of the corresponding association by
143 * the size of the outgoing data chunk.
144 * Also, set the skb destructor for sndbuf accounting later.
146 * Since it is always 1-1 between chunk and skb, and also a new skb is always
147 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
148 * destructor in the data chunk skb for the purpose of the sndbuf space
151 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
153 struct sctp_association *asoc = chunk->asoc;
154 struct sock *sk = asoc->base.sk;
156 /* The sndbuf space is tracked per association. */
157 sctp_association_hold(asoc);
159 skb_set_owner_w(chunk->skb, sk);
161 chunk->skb->destructor = sctp_wfree;
162 /* Save the chunk pointer in skb for sctp_wfree to use later. */
163 skb_shinfo(chunk->skb)->destructor_arg = chunk;
165 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
166 sizeof(struct sk_buff) +
167 sizeof(struct sctp_chunk);
169 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
170 sk->sk_wmem_queued += chunk->skb->truesize;
171 sk_mem_charge(sk, chunk->skb->truesize);
174 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
176 skb_orphan(chunk->skb);
179 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
180 void (*cb)(struct sctp_chunk *))
183 struct sctp_outq *q = &asoc->outqueue;
184 struct sctp_transport *t;
185 struct sctp_chunk *chunk;
187 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
188 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
191 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
194 list_for_each_entry(chunk, &q->sacked, transmitted_list)
197 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
200 list_for_each_entry(chunk, &q->out_chunk_list, list)
204 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
205 void (*cb)(struct sk_buff *, struct sock *))
208 struct sk_buff *skb, *tmp;
210 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
213 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
216 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
220 /* Verify that this is a valid address. */
221 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
226 /* Verify basic sockaddr. */
227 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
231 /* Is this a valid SCTP address? */
232 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
235 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
241 /* Look up the association by its id. If this is not a UDP-style
242 * socket, the ID field is always ignored.
244 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
246 struct sctp_association *asoc = NULL;
248 /* If this is not a UDP-style socket, assoc id should be ignored. */
249 if (!sctp_style(sk, UDP)) {
250 /* Return NULL if the socket state is not ESTABLISHED. It
251 * could be a TCP-style listening socket or a socket which
252 * hasn't yet called connect() to establish an association.
254 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
257 /* Get the first and the only association from the list. */
258 if (!list_empty(&sctp_sk(sk)->ep->asocs))
259 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
260 struct sctp_association, asocs);
264 /* Otherwise this is a UDP-style socket. */
265 if (!id || (id == (sctp_assoc_t)-1))
268 spin_lock_bh(&sctp_assocs_id_lock);
269 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
270 spin_unlock_bh(&sctp_assocs_id_lock);
272 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
278 /* Look up the transport from an address and an assoc id. If both address and
279 * id are specified, the associations matching the address and the id should be
282 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
283 struct sockaddr_storage *addr,
286 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
287 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
288 union sctp_addr *laddr = (union sctp_addr *)addr;
289 struct sctp_transport *transport;
291 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
294 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
301 id_asoc = sctp_id2assoc(sk, id);
302 if (id_asoc && (id_asoc != addr_asoc))
305 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
306 (union sctp_addr *)addr);
311 /* API 3.1.2 bind() - UDP Style Syntax
312 * The syntax of bind() is,
314 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
316 * sd - the socket descriptor returned by socket().
317 * addr - the address structure (struct sockaddr_in or struct
318 * sockaddr_in6 [RFC 2553]),
319 * addr_len - the size of the address structure.
321 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
327 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
330 /* Disallow binding twice. */
331 if (!sctp_sk(sk)->ep->base.bind_addr.port)
332 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
342 static long sctp_get_port_local(struct sock *, union sctp_addr *);
344 /* Verify this is a valid sockaddr. */
345 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
346 union sctp_addr *addr, int len)
350 /* Check minimum size. */
351 if (len < sizeof (struct sockaddr))
354 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
357 /* V4 mapped address are really of AF_INET family */
358 if (addr->sa.sa_family == AF_INET6 &&
359 ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
360 !opt->pf->af_supported(AF_INET, opt))
363 /* If we get this far, af is valid. */
364 af = sctp_get_af_specific(addr->sa.sa_family);
366 if (len < af->sockaddr_len)
372 /* Bind a local address either to an endpoint or to an association. */
373 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
375 struct net *net = sock_net(sk);
376 struct sctp_sock *sp = sctp_sk(sk);
377 struct sctp_endpoint *ep = sp->ep;
378 struct sctp_bind_addr *bp = &ep->base.bind_addr;
383 /* Common sockaddr verification. */
384 af = sctp_sockaddr_af(sp, addr, len);
386 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
387 __func__, sk, addr, len);
391 snum = ntohs(addr->v4.sin_port);
393 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
394 __func__, sk, &addr->sa, bp->port, snum, len);
396 /* PF specific bind() address verification. */
397 if (!sp->pf->bind_verify(sp, addr))
398 return -EADDRNOTAVAIL;
400 /* We must either be unbound, or bind to the same port.
401 * It's OK to allow 0 ports if we are already bound.
402 * We'll just inhert an already bound port in this case
407 else if (snum != bp->port) {
408 pr_debug("%s: new port %d doesn't match existing port "
409 "%d\n", __func__, snum, bp->port);
414 if (snum && snum < inet_prot_sock(net) &&
415 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
418 /* See if the address matches any of the addresses we may have
419 * already bound before checking against other endpoints.
421 if (sctp_bind_addr_match(bp, addr, sp))
424 /* Make sure we are allowed to bind here.
425 * The function sctp_get_port_local() does duplicate address
428 addr->v4.sin_port = htons(snum);
429 if ((ret = sctp_get_port_local(sk, addr))) {
433 /* Refresh ephemeral port. */
435 bp->port = inet_sk(sk)->inet_num;
437 /* Add the address to the bind address list.
438 * Use GFP_ATOMIC since BHs will be disabled.
440 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
441 SCTP_ADDR_SRC, GFP_ATOMIC);
443 /* Copy back into socket for getsockname() use. */
445 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
446 sp->pf->to_sk_saddr(addr, sk);
452 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
454 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
455 * at any one time. If a sender, after sending an ASCONF chunk, decides
456 * it needs to transfer another ASCONF Chunk, it MUST wait until the
457 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
458 * subsequent ASCONF. Note this restriction binds each side, so at any
459 * time two ASCONF may be in-transit on any given association (one sent
460 * from each endpoint).
462 static int sctp_send_asconf(struct sctp_association *asoc,
463 struct sctp_chunk *chunk)
465 struct net *net = sock_net(asoc->base.sk);
468 /* If there is an outstanding ASCONF chunk, queue it for later
471 if (asoc->addip_last_asconf) {
472 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
476 /* Hold the chunk until an ASCONF_ACK is received. */
477 sctp_chunk_hold(chunk);
478 retval = sctp_primitive_ASCONF(net, asoc, chunk);
480 sctp_chunk_free(chunk);
482 asoc->addip_last_asconf = chunk;
488 /* Add a list of addresses as bind addresses to local endpoint or
491 * Basically run through each address specified in the addrs/addrcnt
492 * array/length pair, determine if it is IPv6 or IPv4 and call
493 * sctp_do_bind() on it.
495 * If any of them fails, then the operation will be reversed and the
496 * ones that were added will be removed.
498 * Only sctp_setsockopt_bindx() is supposed to call this function.
500 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
505 struct sockaddr *sa_addr;
508 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
512 for (cnt = 0; cnt < addrcnt; cnt++) {
513 /* The list may contain either IPv4 or IPv6 address;
514 * determine the address length for walking thru the list.
517 af = sctp_get_af_specific(sa_addr->sa_family);
523 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
526 addr_buf += af->sockaddr_len;
530 /* Failed. Cleanup the ones that have been added */
532 sctp_bindx_rem(sk, addrs, cnt);
540 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
541 * associations that are part of the endpoint indicating that a list of local
542 * addresses are added to the endpoint.
544 * If any of the addresses is already in the bind address list of the
545 * association, we do not send the chunk for that association. But it will not
546 * affect other associations.
548 * Only sctp_setsockopt_bindx() is supposed to call this function.
550 static int sctp_send_asconf_add_ip(struct sock *sk,
551 struct sockaddr *addrs,
554 struct net *net = sock_net(sk);
555 struct sctp_sock *sp;
556 struct sctp_endpoint *ep;
557 struct sctp_association *asoc;
558 struct sctp_bind_addr *bp;
559 struct sctp_chunk *chunk;
560 struct sctp_sockaddr_entry *laddr;
561 union sctp_addr *addr;
562 union sctp_addr saveaddr;
569 if (!net->sctp.addip_enable)
575 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
576 __func__, sk, addrs, addrcnt);
578 list_for_each_entry(asoc, &ep->asocs, asocs) {
579 if (!asoc->peer.asconf_capable)
582 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
585 if (!sctp_state(asoc, ESTABLISHED))
588 /* Check if any address in the packed array of addresses is
589 * in the bind address list of the association. If so,
590 * do not send the asconf chunk to its peer, but continue with
591 * other associations.
594 for (i = 0; i < addrcnt; i++) {
596 af = sctp_get_af_specific(addr->v4.sin_family);
602 if (sctp_assoc_lookup_laddr(asoc, addr))
605 addr_buf += af->sockaddr_len;
610 /* Use the first valid address in bind addr list of
611 * association as Address Parameter of ASCONF CHUNK.
613 bp = &asoc->base.bind_addr;
614 p = bp->address_list.next;
615 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
616 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
617 addrcnt, SCTP_PARAM_ADD_IP);
623 /* Add the new addresses to the bind address list with
624 * use_as_src set to 0.
627 for (i = 0; i < addrcnt; i++) {
629 af = sctp_get_af_specific(addr->v4.sin_family);
630 memcpy(&saveaddr, addr, af->sockaddr_len);
631 retval = sctp_add_bind_addr(bp, &saveaddr,
633 SCTP_ADDR_NEW, GFP_ATOMIC);
634 addr_buf += af->sockaddr_len;
636 if (asoc->src_out_of_asoc_ok) {
637 struct sctp_transport *trans;
639 list_for_each_entry(trans,
640 &asoc->peer.transport_addr_list, transports) {
641 /* Clear the source and route cache */
642 sctp_transport_dst_release(trans);
643 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
644 2*asoc->pathmtu, 4380));
645 trans->ssthresh = asoc->peer.i.a_rwnd;
646 trans->rto = asoc->rto_initial;
647 sctp_max_rto(asoc, trans);
648 trans->rtt = trans->srtt = trans->rttvar = 0;
649 sctp_transport_route(trans, NULL,
650 sctp_sk(asoc->base.sk));
653 retval = sctp_send_asconf(asoc, chunk);
660 /* Remove a list of addresses from bind addresses list. Do not remove the
663 * Basically run through each address specified in the addrs/addrcnt
664 * array/length pair, determine if it is IPv6 or IPv4 and call
665 * sctp_del_bind() on it.
667 * If any of them fails, then the operation will be reversed and the
668 * ones that were removed will be added back.
670 * At least one address has to be left; if only one address is
671 * available, the operation will return -EBUSY.
673 * Only sctp_setsockopt_bindx() is supposed to call this function.
675 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
677 struct sctp_sock *sp = sctp_sk(sk);
678 struct sctp_endpoint *ep = sp->ep;
680 struct sctp_bind_addr *bp = &ep->base.bind_addr;
683 union sctp_addr *sa_addr;
686 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
687 __func__, sk, addrs, addrcnt);
690 for (cnt = 0; cnt < addrcnt; cnt++) {
691 /* If the bind address list is empty or if there is only one
692 * bind address, there is nothing more to be removed (we need
693 * at least one address here).
695 if (list_empty(&bp->address_list) ||
696 (sctp_list_single_entry(&bp->address_list))) {
702 af = sctp_get_af_specific(sa_addr->sa.sa_family);
708 if (!af->addr_valid(sa_addr, sp, NULL)) {
709 retval = -EADDRNOTAVAIL;
713 if (sa_addr->v4.sin_port &&
714 sa_addr->v4.sin_port != htons(bp->port)) {
719 if (!sa_addr->v4.sin_port)
720 sa_addr->v4.sin_port = htons(bp->port);
722 /* FIXME - There is probably a need to check if sk->sk_saddr and
723 * sk->sk_rcv_addr are currently set to one of the addresses to
724 * be removed. This is something which needs to be looked into
725 * when we are fixing the outstanding issues with multi-homing
726 * socket routing and failover schemes. Refer to comments in
727 * sctp_do_bind(). -daisy
729 retval = sctp_del_bind_addr(bp, sa_addr);
731 addr_buf += af->sockaddr_len;
734 /* Failed. Add the ones that has been removed back */
736 sctp_bindx_add(sk, addrs, cnt);
744 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
745 * the associations that are part of the endpoint indicating that a list of
746 * local addresses are removed from the endpoint.
748 * If any of the addresses is already in the bind address list of the
749 * association, we do not send the chunk for that association. But it will not
750 * affect other associations.
752 * Only sctp_setsockopt_bindx() is supposed to call this function.
754 static int sctp_send_asconf_del_ip(struct sock *sk,
755 struct sockaddr *addrs,
758 struct net *net = sock_net(sk);
759 struct sctp_sock *sp;
760 struct sctp_endpoint *ep;
761 struct sctp_association *asoc;
762 struct sctp_transport *transport;
763 struct sctp_bind_addr *bp;
764 struct sctp_chunk *chunk;
765 union sctp_addr *laddr;
768 struct sctp_sockaddr_entry *saddr;
774 if (!net->sctp.addip_enable)
780 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
781 __func__, sk, addrs, addrcnt);
783 list_for_each_entry(asoc, &ep->asocs, asocs) {
785 if (!asoc->peer.asconf_capable)
788 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791 if (!sctp_state(asoc, ESTABLISHED))
794 /* Check if any address in the packed array of addresses is
795 * not present in the bind address list of the association.
796 * If so, do not send the asconf chunk to its peer, but
797 * continue with other associations.
800 for (i = 0; i < addrcnt; i++) {
802 af = sctp_get_af_specific(laddr->v4.sin_family);
808 if (!sctp_assoc_lookup_laddr(asoc, laddr))
811 addr_buf += af->sockaddr_len;
816 /* Find one address in the association's bind address list
817 * that is not in the packed array of addresses. This is to
818 * make sure that we do not delete all the addresses in the
821 bp = &asoc->base.bind_addr;
822 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
824 if ((laddr == NULL) && (addrcnt == 1)) {
825 if (asoc->asconf_addr_del_pending)
827 asoc->asconf_addr_del_pending =
828 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
829 if (asoc->asconf_addr_del_pending == NULL) {
833 asoc->asconf_addr_del_pending->sa.sa_family =
835 asoc->asconf_addr_del_pending->v4.sin_port =
837 if (addrs->sa_family == AF_INET) {
838 struct sockaddr_in *sin;
840 sin = (struct sockaddr_in *)addrs;
841 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
842 } else if (addrs->sa_family == AF_INET6) {
843 struct sockaddr_in6 *sin6;
845 sin6 = (struct sockaddr_in6 *)addrs;
846 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
850 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
851 asoc->asconf_addr_del_pending);
853 asoc->src_out_of_asoc_ok = 1;
861 /* We do not need RCU protection throughout this loop
862 * because this is done under a socket lock from the
865 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
873 /* Reset use_as_src flag for the addresses in the bind address
874 * list that are to be deleted.
877 for (i = 0; i < addrcnt; i++) {
879 af = sctp_get_af_specific(laddr->v4.sin_family);
880 list_for_each_entry(saddr, &bp->address_list, list) {
881 if (sctp_cmp_addr_exact(&saddr->a, laddr))
882 saddr->state = SCTP_ADDR_DEL;
884 addr_buf += af->sockaddr_len;
887 /* Update the route and saddr entries for all the transports
888 * as some of the addresses in the bind address list are
889 * about to be deleted and cannot be used as source addresses.
891 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
893 sctp_transport_dst_release(transport);
894 sctp_transport_route(transport, NULL,
895 sctp_sk(asoc->base.sk));
899 /* We don't need to transmit ASCONF */
901 retval = sctp_send_asconf(asoc, chunk);
907 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
908 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
910 struct sock *sk = sctp_opt2sk(sp);
911 union sctp_addr *addr;
914 /* It is safe to write port space in caller. */
916 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
917 af = sctp_get_af_specific(addr->sa.sa_family);
920 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
923 if (addrw->state == SCTP_ADDR_NEW)
924 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
926 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
929 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
932 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
935 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
936 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
939 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
940 * Section 3.1.2 for this usage.
942 * addrs is a pointer to an array of one or more socket addresses. Each
943 * address is contained in its appropriate structure (i.e. struct
944 * sockaddr_in or struct sockaddr_in6) the family of the address type
945 * must be used to distinguish the address length (note that this
946 * representation is termed a "packed array" of addresses). The caller
947 * specifies the number of addresses in the array with addrcnt.
949 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
950 * -1, and sets errno to the appropriate error code.
952 * For SCTP, the port given in each socket address must be the same, or
953 * sctp_bindx() will fail, setting errno to EINVAL.
955 * The flags parameter is formed from the bitwise OR of zero or more of
956 * the following currently defined flags:
958 * SCTP_BINDX_ADD_ADDR
960 * SCTP_BINDX_REM_ADDR
962 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
963 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
964 * addresses from the association. The two flags are mutually exclusive;
965 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
966 * not remove all addresses from an association; sctp_bindx() will
967 * reject such an attempt with EINVAL.
969 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
970 * additional addresses with an endpoint after calling bind(). Or use
971 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
972 * socket is associated with so that no new association accepted will be
973 * associated with those addresses. If the endpoint supports dynamic
974 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
975 * endpoint to send the appropriate message to the peer to change the
976 * peers address lists.
978 * Adding and removing addresses from a connected association is
979 * optional functionality. Implementations that do not support this
980 * functionality should return EOPNOTSUPP.
982 * Basically do nothing but copying the addresses from user to kernel
983 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
984 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
987 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
990 * sk The sk of the socket
991 * addrs The pointer to the addresses in user land
992 * addrssize Size of the addrs buffer
993 * op Operation to perform (add or remove, see the flags of
996 * Returns 0 if ok, <0 errno code on error.
998 static int sctp_setsockopt_bindx(struct sock *sk,
999 struct sockaddr __user *addrs,
1000 int addrs_size, int op)
1002 struct sockaddr *kaddrs;
1006 struct sockaddr *sa_addr;
1010 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1011 __func__, sk, addrs, addrs_size, op);
1013 if (unlikely(addrs_size <= 0))
1016 kaddrs = vmemdup_user(addrs, addrs_size);
1017 if (unlikely(IS_ERR(kaddrs)))
1018 return PTR_ERR(kaddrs);
1020 /* Walk through the addrs buffer and count the number of addresses. */
1022 while (walk_size < addrs_size) {
1023 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1029 af = sctp_get_af_specific(sa_addr->sa_family);
1031 /* If the address family is not supported or if this address
1032 * causes the address buffer to overflow return EINVAL.
1034 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1039 addr_buf += af->sockaddr_len;
1040 walk_size += af->sockaddr_len;
1045 case SCTP_BINDX_ADD_ADDR:
1046 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1049 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1052 case SCTP_BINDX_REM_ADDR:
1053 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1056 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1070 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1072 * Common routine for handling connect() and sctp_connectx().
1073 * Connect will come in with just a single address.
1075 static int __sctp_connect(struct sock *sk,
1076 struct sockaddr *kaddrs,
1078 sctp_assoc_t *assoc_id)
1080 struct net *net = sock_net(sk);
1081 struct sctp_sock *sp;
1082 struct sctp_endpoint *ep;
1083 struct sctp_association *asoc = NULL;
1084 struct sctp_association *asoc2;
1085 struct sctp_transport *transport;
1087 enum sctp_scope scope;
1092 union sctp_addr *sa_addr = NULL;
1094 unsigned short port;
1095 unsigned int f_flags = 0;
1100 /* connect() cannot be done on a socket that is already in ESTABLISHED
1101 * state - UDP-style peeled off socket or a TCP-style socket that
1102 * is already connected.
1103 * It cannot be done even on a TCP-style listening socket.
1105 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1106 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1111 /* Walk through the addrs buffer and count the number of addresses. */
1113 while (walk_size < addrs_size) {
1116 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1122 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1124 /* If the address family is not supported or if this address
1125 * causes the address buffer to overflow return EINVAL.
1127 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1132 port = ntohs(sa_addr->v4.sin_port);
1134 /* Save current address so we can work with it */
1135 memcpy(&to, sa_addr, af->sockaddr_len);
1137 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1141 /* Make sure the destination port is correctly set
1144 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1149 /* Check if there already is a matching association on the
1150 * endpoint (other than the one created here).
1152 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1153 if (asoc2 && asoc2 != asoc) {
1154 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1161 /* If we could not find a matching association on the endpoint,
1162 * make sure that there is no peeled-off association matching
1163 * the peer address even on another socket.
1165 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1166 err = -EADDRNOTAVAIL;
1171 /* If a bind() or sctp_bindx() is not called prior to
1172 * an sctp_connectx() call, the system picks an
1173 * ephemeral port and will choose an address set
1174 * equivalent to binding with a wildcard address.
1176 if (!ep->base.bind_addr.port) {
1177 if (sctp_autobind(sk)) {
1183 * If an unprivileged user inherits a 1-many
1184 * style socket with open associations on a
1185 * privileged port, it MAY be permitted to
1186 * accept new associations, but it SHOULD NOT
1187 * be permitted to open new associations.
1189 if (ep->base.bind_addr.port <
1190 inet_prot_sock(net) &&
1191 !ns_capable(net->user_ns,
1192 CAP_NET_BIND_SERVICE)) {
1198 scope = sctp_scope(&to);
1199 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1205 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1213 /* Prime the peer's transport structures. */
1214 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1222 addr_buf += af->sockaddr_len;
1223 walk_size += af->sockaddr_len;
1226 /* In case the user of sctp_connectx() wants an association
1227 * id back, assign one now.
1230 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1235 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1240 /* Initialize sk's dport and daddr for getpeername() */
1241 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1242 sp->pf->to_sk_daddr(sa_addr, sk);
1245 /* in-kernel sockets don't generally have a file allocated to them
1246 * if all they do is call sock_create_kern().
1248 if (sk->sk_socket->file)
1249 f_flags = sk->sk_socket->file->f_flags;
1251 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1254 *assoc_id = asoc->assoc_id;
1255 err = sctp_wait_for_connect(asoc, &timeo);
1256 /* Note: the asoc may be freed after the return of
1257 * sctp_wait_for_connect.
1260 /* Don't free association on exit. */
1264 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1265 __func__, asoc, kaddrs, err);
1268 /* sctp_primitive_ASSOCIATE may have added this association
1269 * To the hash table, try to unhash it, just in case, its a noop
1270 * if it wasn't hashed so we're safe
1272 sctp_association_free(asoc);
1277 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1280 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1281 * sctp_assoc_t *asoc);
1283 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1284 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1285 * or IPv6 addresses.
1287 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1288 * Section 3.1.2 for this usage.
1290 * addrs is a pointer to an array of one or more socket addresses. Each
1291 * address is contained in its appropriate structure (i.e. struct
1292 * sockaddr_in or struct sockaddr_in6) the family of the address type
1293 * must be used to distengish the address length (note that this
1294 * representation is termed a "packed array" of addresses). The caller
1295 * specifies the number of addresses in the array with addrcnt.
1297 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1298 * the association id of the new association. On failure, sctp_connectx()
1299 * returns -1, and sets errno to the appropriate error code. The assoc_id
1300 * is not touched by the kernel.
1302 * For SCTP, the port given in each socket address must be the same, or
1303 * sctp_connectx() will fail, setting errno to EINVAL.
1305 * An application can use sctp_connectx to initiate an association with
1306 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1307 * allows a caller to specify multiple addresses at which a peer can be
1308 * reached. The way the SCTP stack uses the list of addresses to set up
1309 * the association is implementation dependent. This function only
1310 * specifies that the stack will try to make use of all the addresses in
1311 * the list when needed.
1313 * Note that the list of addresses passed in is only used for setting up
1314 * the association. It does not necessarily equal the set of addresses
1315 * the peer uses for the resulting association. If the caller wants to
1316 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1317 * retrieve them after the association has been set up.
1319 * Basically do nothing but copying the addresses from user to kernel
1320 * land and invoking either sctp_connectx(). This is used for tunneling
1321 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1323 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1326 * sk The sk of the socket
1327 * addrs The pointer to the addresses in user land
1328 * addrssize Size of the addrs buffer
1330 * Returns >=0 if ok, <0 errno code on error.
1332 static int __sctp_setsockopt_connectx(struct sock *sk,
1333 struct sockaddr __user *addrs,
1335 sctp_assoc_t *assoc_id)
1337 struct sockaddr *kaddrs;
1340 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1341 __func__, sk, addrs, addrs_size);
1343 if (unlikely(addrs_size <= 0))
1346 kaddrs = vmemdup_user(addrs, addrs_size);
1347 if (unlikely(IS_ERR(kaddrs)))
1348 return PTR_ERR(kaddrs);
1350 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1357 * This is an older interface. It's kept for backward compatibility
1358 * to the option that doesn't provide association id.
1360 static int sctp_setsockopt_connectx_old(struct sock *sk,
1361 struct sockaddr __user *addrs,
1364 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1368 * New interface for the API. The since the API is done with a socket
1369 * option, to make it simple we feed back the association id is as a return
1370 * indication to the call. Error is always negative and association id is
1373 static int sctp_setsockopt_connectx(struct sock *sk,
1374 struct sockaddr __user *addrs,
1377 sctp_assoc_t assoc_id = 0;
1380 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1389 * New (hopefully final) interface for the API.
1390 * We use the sctp_getaddrs_old structure so that use-space library
1391 * can avoid any unnecessary allocations. The only different part
1392 * is that we store the actual length of the address buffer into the
1393 * addrs_num structure member. That way we can re-use the existing
1396 #ifdef CONFIG_COMPAT
1397 struct compat_sctp_getaddrs_old {
1398 sctp_assoc_t assoc_id;
1400 compat_uptr_t addrs; /* struct sockaddr * */
1404 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1405 char __user *optval,
1408 struct sctp_getaddrs_old param;
1409 sctp_assoc_t assoc_id = 0;
1412 #ifdef CONFIG_COMPAT
1413 if (in_compat_syscall()) {
1414 struct compat_sctp_getaddrs_old param32;
1416 if (len < sizeof(param32))
1418 if (copy_from_user(¶m32, optval, sizeof(param32)))
1421 param.assoc_id = param32.assoc_id;
1422 param.addr_num = param32.addr_num;
1423 param.addrs = compat_ptr(param32.addrs);
1427 if (len < sizeof(param))
1429 if (copy_from_user(¶m, optval, sizeof(param)))
1433 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1434 param.addrs, param.addr_num,
1436 if (err == 0 || err == -EINPROGRESS) {
1437 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1439 if (put_user(sizeof(assoc_id), optlen))
1446 /* API 3.1.4 close() - UDP Style Syntax
1447 * Applications use close() to perform graceful shutdown (as described in
1448 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1449 * by a UDP-style socket.
1453 * ret = close(int sd);
1455 * sd - the socket descriptor of the associations to be closed.
1457 * To gracefully shutdown a specific association represented by the
1458 * UDP-style socket, an application should use the sendmsg() call,
1459 * passing no user data, but including the appropriate flag in the
1460 * ancillary data (see Section xxxx).
1462 * If sd in the close() call is a branched-off socket representing only
1463 * one association, the shutdown is performed on that association only.
1465 * 4.1.6 close() - TCP Style Syntax
1467 * Applications use close() to gracefully close down an association.
1471 * int close(int sd);
1473 * sd - the socket descriptor of the association to be closed.
1475 * After an application calls close() on a socket descriptor, no further
1476 * socket operations will succeed on that descriptor.
1478 * API 7.1.4 SO_LINGER
1480 * An application using the TCP-style socket can use this option to
1481 * perform the SCTP ABORT primitive. The linger option structure is:
1484 * int l_onoff; // option on/off
1485 * int l_linger; // linger time
1488 * To enable the option, set l_onoff to 1. If the l_linger value is set
1489 * to 0, calling close() is the same as the ABORT primitive. If the
1490 * value is set to a negative value, the setsockopt() call will return
1491 * an error. If the value is set to a positive value linger_time, the
1492 * close() can be blocked for at most linger_time ms. If the graceful
1493 * shutdown phase does not finish during this period, close() will
1494 * return but the graceful shutdown phase continues in the system.
1496 static void sctp_close(struct sock *sk, long timeout)
1498 struct net *net = sock_net(sk);
1499 struct sctp_endpoint *ep;
1500 struct sctp_association *asoc;
1501 struct list_head *pos, *temp;
1502 unsigned int data_was_unread;
1504 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1506 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1507 sk->sk_shutdown = SHUTDOWN_MASK;
1508 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1510 ep = sctp_sk(sk)->ep;
1512 /* Clean up any skbs sitting on the receive queue. */
1513 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1514 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1516 /* Walk all associations on an endpoint. */
1517 list_for_each_safe(pos, temp, &ep->asocs) {
1518 asoc = list_entry(pos, struct sctp_association, asocs);
1520 if (sctp_style(sk, TCP)) {
1521 /* A closed association can still be in the list if
1522 * it belongs to a TCP-style listening socket that is
1523 * not yet accepted. If so, free it. If not, send an
1524 * ABORT or SHUTDOWN based on the linger options.
1526 if (sctp_state(asoc, CLOSED)) {
1527 sctp_association_free(asoc);
1532 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1533 !skb_queue_empty(&asoc->ulpq.reasm) ||
1534 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1535 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1536 struct sctp_chunk *chunk;
1538 chunk = sctp_make_abort_user(asoc, NULL, 0);
1539 sctp_primitive_ABORT(net, asoc, chunk);
1541 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1544 /* On a TCP-style socket, block for at most linger_time if set. */
1545 if (sctp_style(sk, TCP) && timeout)
1546 sctp_wait_for_close(sk, timeout);
1548 /* This will run the backlog queue. */
1551 /* Supposedly, no process has access to the socket, but
1552 * the net layers still may.
1553 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1554 * held and that should be grabbed before socket lock.
1556 spin_lock_bh(&net->sctp.addr_wq_lock);
1557 bh_lock_sock_nested(sk);
1559 /* Hold the sock, since sk_common_release() will put sock_put()
1560 * and we have just a little more cleanup.
1563 sk_common_release(sk);
1566 spin_unlock_bh(&net->sctp.addr_wq_lock);
1570 SCTP_DBG_OBJCNT_DEC(sock);
1573 /* Handle EPIPE error. */
1574 static int sctp_error(struct sock *sk, int flags, int err)
1577 err = sock_error(sk) ? : -EPIPE;
1578 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1579 send_sig(SIGPIPE, current, 0);
1583 /* API 3.1.3 sendmsg() - UDP Style Syntax
1585 * An application uses sendmsg() and recvmsg() calls to transmit data to
1586 * and receive data from its peer.
1588 * ssize_t sendmsg(int socket, const struct msghdr *message,
1591 * socket - the socket descriptor of the endpoint.
1592 * message - pointer to the msghdr structure which contains a single
1593 * user message and possibly some ancillary data.
1595 * See Section 5 for complete description of the data
1598 * flags - flags sent or received with the user message, see Section
1599 * 5 for complete description of the flags.
1601 * Note: This function could use a rewrite especially when explicit
1602 * connect support comes in.
1604 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1606 static int sctp_msghdr_parse(const struct msghdr *msg,
1607 struct sctp_cmsgs *cmsgs);
1609 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1610 struct sctp_sndrcvinfo *srinfo,
1611 const struct msghdr *msg, size_t msg_len)
1616 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1619 if (msg_len > sk->sk_sndbuf)
1622 memset(cmsgs, 0, sizeof(*cmsgs));
1623 err = sctp_msghdr_parse(msg, cmsgs);
1625 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1629 memset(srinfo, 0, sizeof(*srinfo));
1630 if (cmsgs->srinfo) {
1631 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1632 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1633 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1634 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1635 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1636 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1640 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1641 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1642 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1643 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1644 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1647 sflags = srinfo->sinfo_flags;
1648 if (!sflags && msg_len)
1651 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1654 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1655 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1658 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1664 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1665 struct sctp_cmsgs *cmsgs,
1666 union sctp_addr *daddr,
1667 struct sctp_transport **tp)
1669 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1670 struct net *net = sock_net(sk);
1671 struct sctp_association *asoc;
1672 enum sctp_scope scope;
1677 if (sflags & (SCTP_EOF | SCTP_ABORT))
1680 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1681 sctp_sstate(sk, CLOSING)))
1682 return -EADDRNOTAVAIL;
1684 if (sctp_endpoint_is_peeled_off(ep, daddr))
1685 return -EADDRNOTAVAIL;
1687 if (!ep->base.bind_addr.port) {
1688 if (sctp_autobind(sk))
1691 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1692 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1696 scope = sctp_scope(daddr);
1698 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1702 if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1708 struct sctp_initmsg *init = cmsgs->init;
1710 if (init->sinit_num_ostreams) {
1711 __u16 outcnt = init->sinit_num_ostreams;
1713 asoc->c.sinit_num_ostreams = outcnt;
1714 /* outcnt has been changed, need to re-init stream */
1715 err = sctp_stream_init(&asoc->stream, outcnt, 0,
1721 if (init->sinit_max_instreams)
1722 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1724 if (init->sinit_max_attempts)
1725 asoc->max_init_attempts = init->sinit_max_attempts;
1727 if (init->sinit_max_init_timeo)
1728 asoc->max_init_timeo =
1729 msecs_to_jiffies(init->sinit_max_init_timeo);
1732 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1741 sctp_association_free(asoc);
1745 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1746 __u16 sflags, struct msghdr *msg,
1749 struct sock *sk = asoc->base.sk;
1750 struct net *net = sock_net(sk);
1752 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1755 if (sflags & SCTP_EOF) {
1756 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1757 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1762 if (sflags & SCTP_ABORT) {
1763 struct sctp_chunk *chunk;
1765 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1769 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1770 sctp_primitive_ABORT(net, asoc, chunk);
1778 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1779 struct msghdr *msg, size_t msg_len,
1780 struct sctp_transport *transport,
1781 struct sctp_sndrcvinfo *sinfo)
1783 struct sock *sk = asoc->base.sk;
1784 struct net *net = sock_net(sk);
1785 struct sctp_datamsg *datamsg;
1786 bool wait_connect = false;
1787 struct sctp_chunk *chunk;
1791 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1796 if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
1797 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1802 if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
1807 if (sctp_state(asoc, CLOSED)) {
1808 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1812 if (sctp_sk(sk)->strm_interleave) {
1813 timeo = sock_sndtimeo(sk, 0);
1814 err = sctp_wait_for_connect(asoc, &timeo);
1818 wait_connect = true;
1821 pr_debug("%s: we associated primitively\n", __func__);
1824 if (asoc->pmtu_pending)
1825 sctp_assoc_pending_pmtu(asoc);
1827 if (sctp_wspace(asoc) < msg_len)
1828 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1830 if (!sctp_wspace(asoc)) {
1831 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1832 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1837 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1838 if (IS_ERR(datamsg)) {
1839 err = PTR_ERR(datamsg);
1843 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1845 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1846 sctp_chunk_hold(chunk);
1847 sctp_set_owner_w(chunk);
1848 chunk->transport = transport;
1851 err = sctp_primitive_SEND(net, asoc, datamsg);
1853 sctp_datamsg_free(datamsg);
1857 pr_debug("%s: we sent primitively\n", __func__);
1859 sctp_datamsg_put(datamsg);
1861 if (unlikely(wait_connect)) {
1862 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1863 sctp_wait_for_connect(asoc, &timeo);
1872 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1873 const struct msghdr *msg,
1874 struct sctp_cmsgs *cmsgs)
1876 union sctp_addr *daddr = NULL;
1879 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1880 int len = msg->msg_namelen;
1882 if (len > sizeof(*daddr))
1883 len = sizeof(*daddr);
1885 daddr = (union sctp_addr *)msg->msg_name;
1887 err = sctp_verify_addr(sk, daddr, len);
1889 return ERR_PTR(err);
1895 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1896 struct sctp_sndrcvinfo *sinfo,
1897 struct sctp_cmsgs *cmsgs)
1899 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1900 sinfo->sinfo_stream = asoc->default_stream;
1901 sinfo->sinfo_ppid = asoc->default_ppid;
1902 sinfo->sinfo_context = asoc->default_context;
1903 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1907 sinfo->sinfo_timetolive = asoc->default_timetolive;
1910 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1912 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1913 struct sctp_transport *transport = NULL;
1914 struct sctp_sndrcvinfo _sinfo, *sinfo;
1915 struct sctp_association *asoc;
1916 struct sctp_cmsgs cmsgs;
1917 union sctp_addr *daddr;
1922 /* Parse and get snd_info */
1923 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1928 sflags = sinfo->sinfo_flags;
1930 /* Get daddr from msg */
1931 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1932 if (IS_ERR(daddr)) {
1933 err = PTR_ERR(daddr);
1939 /* If a msg_name has been specified, assume this is to be used. */
1941 /* Look for a matching association on the endpoint. */
1942 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1944 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
1952 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
1957 /* Do we need to create the association? */
1959 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1964 asoc = transport->asoc;
1968 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
1971 /* Update snd_info with the asoc */
1972 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1974 /* Send msg to the asoc */
1975 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
1976 if (err < 0 && err != -ESRCH && new)
1977 sctp_association_free(asoc);
1982 return sctp_error(sk, msg->msg_flags, err);
1985 /* This is an extended version of skb_pull() that removes the data from the
1986 * start of a skb even when data is spread across the list of skb's in the
1987 * frag_list. len specifies the total amount of data that needs to be removed.
1988 * when 'len' bytes could be removed from the skb, it returns 0.
1989 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1990 * could not be removed.
1992 static int sctp_skb_pull(struct sk_buff *skb, int len)
1994 struct sk_buff *list;
1995 int skb_len = skb_headlen(skb);
1998 if (len <= skb_len) {
1999 __skb_pull(skb, len);
2003 __skb_pull(skb, skb_len);
2005 skb_walk_frags(skb, list) {
2006 rlen = sctp_skb_pull(list, len);
2007 skb->len -= (len-rlen);
2008 skb->data_len -= (len-rlen);
2019 /* API 3.1.3 recvmsg() - UDP Style Syntax
2021 * ssize_t recvmsg(int socket, struct msghdr *message,
2024 * socket - the socket descriptor of the endpoint.
2025 * message - pointer to the msghdr structure which contains a single
2026 * user message and possibly some ancillary data.
2028 * See Section 5 for complete description of the data
2031 * flags - flags sent or received with the user message, see Section
2032 * 5 for complete description of the flags.
2034 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2035 int noblock, int flags, int *addr_len)
2037 struct sctp_ulpevent *event = NULL;
2038 struct sctp_sock *sp = sctp_sk(sk);
2039 struct sk_buff *skb, *head_skb;
2044 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2045 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2050 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2051 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2056 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2060 /* Get the total length of the skb including any skb's in the
2069 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2071 event = sctp_skb2event(skb);
2076 if (event->chunk && event->chunk->head_skb)
2077 head_skb = event->chunk->head_skb;
2080 sock_recv_ts_and_drops(msg, sk, head_skb);
2081 if (sctp_ulpevent_is_notification(event)) {
2082 msg->msg_flags |= MSG_NOTIFICATION;
2083 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2085 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2088 /* Check if we allow SCTP_NXTINFO. */
2089 if (sp->recvnxtinfo)
2090 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2091 /* Check if we allow SCTP_RCVINFO. */
2092 if (sp->recvrcvinfo)
2093 sctp_ulpevent_read_rcvinfo(event, msg);
2094 /* Check if we allow SCTP_SNDRCVINFO. */
2095 if (sp->subscribe.sctp_data_io_event)
2096 sctp_ulpevent_read_sndrcvinfo(event, msg);
2100 /* If skb's length exceeds the user's buffer, update the skb and
2101 * push it back to the receive_queue so that the next call to
2102 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2104 if (skb_len > copied) {
2105 msg->msg_flags &= ~MSG_EOR;
2106 if (flags & MSG_PEEK)
2108 sctp_skb_pull(skb, copied);
2109 skb_queue_head(&sk->sk_receive_queue, skb);
2111 /* When only partial message is copied to the user, increase
2112 * rwnd by that amount. If all the data in the skb is read,
2113 * rwnd is updated when the event is freed.
2115 if (!sctp_ulpevent_is_notification(event))
2116 sctp_assoc_rwnd_increase(event->asoc, copied);
2118 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2119 (event->msg_flags & MSG_EOR))
2120 msg->msg_flags |= MSG_EOR;
2122 msg->msg_flags &= ~MSG_EOR;
2125 if (flags & MSG_PEEK) {
2126 /* Release the skb reference acquired after peeking the skb in
2127 * sctp_skb_recv_datagram().
2131 /* Free the event which includes releasing the reference to
2132 * the owner of the skb, freeing the skb and updating the
2135 sctp_ulpevent_free(event);
2142 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2144 * This option is a on/off flag. If enabled no SCTP message
2145 * fragmentation will be performed. Instead if a message being sent
2146 * exceeds the current PMTU size, the message will NOT be sent and
2147 * instead a error will be indicated to the user.
2149 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2150 char __user *optval,
2151 unsigned int optlen)
2155 if (optlen < sizeof(int))
2158 if (get_user(val, (int __user *)optval))
2161 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2166 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2167 unsigned int optlen)
2169 struct sctp_association *asoc;
2170 struct sctp_ulpevent *event;
2172 if (optlen > sizeof(struct sctp_event_subscribe))
2174 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2177 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2178 * if there is no data to be sent or retransmit, the stack will
2179 * immediately send up this notification.
2181 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2182 &sctp_sk(sk)->subscribe)) {
2183 asoc = sctp_id2assoc(sk, 0);
2185 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2186 event = sctp_ulpevent_make_sender_dry_event(asoc,
2187 GFP_USER | __GFP_NOWARN);
2191 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2198 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2200 * This socket option is applicable to the UDP-style socket only. When
2201 * set it will cause associations that are idle for more than the
2202 * specified number of seconds to automatically close. An association
2203 * being idle is defined an association that has NOT sent or received
2204 * user data. The special value of '0' indicates that no automatic
2205 * close of any associations should be performed. The option expects an
2206 * integer defining the number of seconds of idle time before an
2207 * association is closed.
2209 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2210 unsigned int optlen)
2212 struct sctp_sock *sp = sctp_sk(sk);
2213 struct net *net = sock_net(sk);
2215 /* Applicable to UDP-style socket only */
2216 if (sctp_style(sk, TCP))
2218 if (optlen != sizeof(int))
2220 if (copy_from_user(&sp->autoclose, optval, optlen))
2223 if (sp->autoclose > net->sctp.max_autoclose)
2224 sp->autoclose = net->sctp.max_autoclose;
2229 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2231 * Applications can enable or disable heartbeats for any peer address of
2232 * an association, modify an address's heartbeat interval, force a
2233 * heartbeat to be sent immediately, and adjust the address's maximum
2234 * number of retransmissions sent before an address is considered
2235 * unreachable. The following structure is used to access and modify an
2236 * address's parameters:
2238 * struct sctp_paddrparams {
2239 * sctp_assoc_t spp_assoc_id;
2240 * struct sockaddr_storage spp_address;
2241 * uint32_t spp_hbinterval;
2242 * uint16_t spp_pathmaxrxt;
2243 * uint32_t spp_pathmtu;
2244 * uint32_t spp_sackdelay;
2245 * uint32_t spp_flags;
2248 * spp_assoc_id - (one-to-many style socket) This is filled in the
2249 * application, and identifies the association for
2251 * spp_address - This specifies which address is of interest.
2252 * spp_hbinterval - This contains the value of the heartbeat interval,
2253 * in milliseconds. If a value of zero
2254 * is present in this field then no changes are to
2255 * be made to this parameter.
2256 * spp_pathmaxrxt - This contains the maximum number of
2257 * retransmissions before this address shall be
2258 * considered unreachable. If a value of zero
2259 * is present in this field then no changes are to
2260 * be made to this parameter.
2261 * spp_pathmtu - When Path MTU discovery is disabled the value
2262 * specified here will be the "fixed" path mtu.
2263 * Note that if the spp_address field is empty
2264 * then all associations on this address will
2265 * have this fixed path mtu set upon them.
2267 * spp_sackdelay - When delayed sack is enabled, this value specifies
2268 * the number of milliseconds that sacks will be delayed
2269 * for. This value will apply to all addresses of an
2270 * association if the spp_address field is empty. Note
2271 * also, that if delayed sack is enabled and this
2272 * value is set to 0, no change is made to the last
2273 * recorded delayed sack timer value.
2275 * spp_flags - These flags are used to control various features
2276 * on an association. The flag field may contain
2277 * zero or more of the following options.
2279 * SPP_HB_ENABLE - Enable heartbeats on the
2280 * specified address. Note that if the address
2281 * field is empty all addresses for the association
2282 * have heartbeats enabled upon them.
2284 * SPP_HB_DISABLE - Disable heartbeats on the
2285 * speicifed address. Note that if the address
2286 * field is empty all addresses for the association
2287 * will have their heartbeats disabled. Note also
2288 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2289 * mutually exclusive, only one of these two should
2290 * be specified. Enabling both fields will have
2291 * undetermined results.
2293 * SPP_HB_DEMAND - Request a user initiated heartbeat
2294 * to be made immediately.
2296 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2297 * heartbeat delayis to be set to the value of 0
2300 * SPP_PMTUD_ENABLE - This field will enable PMTU
2301 * discovery upon the specified address. Note that
2302 * if the address feild is empty then all addresses
2303 * on the association are effected.
2305 * SPP_PMTUD_DISABLE - This field will disable PMTU
2306 * discovery upon the specified address. Note that
2307 * if the address feild is empty then all addresses
2308 * on the association are effected. Not also that
2309 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2310 * exclusive. Enabling both will have undetermined
2313 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2314 * on delayed sack. The time specified in spp_sackdelay
2315 * is used to specify the sack delay for this address. Note
2316 * that if spp_address is empty then all addresses will
2317 * enable delayed sack and take on the sack delay
2318 * value specified in spp_sackdelay.
2319 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2320 * off delayed sack. If the spp_address field is blank then
2321 * delayed sack is disabled for the entire association. Note
2322 * also that this field is mutually exclusive to
2323 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2326 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2327 struct sctp_transport *trans,
2328 struct sctp_association *asoc,
2329 struct sctp_sock *sp,
2332 int sackdelay_change)
2336 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2337 struct net *net = sock_net(trans->asoc->base.sk);
2339 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2344 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2345 * this field is ignored. Note also that a value of zero indicates
2346 * the current setting should be left unchanged.
2348 if (params->spp_flags & SPP_HB_ENABLE) {
2350 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2351 * set. This lets us use 0 value when this flag
2354 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2355 params->spp_hbinterval = 0;
2357 if (params->spp_hbinterval ||
2358 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2361 msecs_to_jiffies(params->spp_hbinterval);
2364 msecs_to_jiffies(params->spp_hbinterval);
2366 sp->hbinterval = params->spp_hbinterval;
2373 trans->param_flags =
2374 (trans->param_flags & ~SPP_HB) | hb_change;
2377 (asoc->param_flags & ~SPP_HB) | hb_change;
2380 (sp->param_flags & ~SPP_HB) | hb_change;
2384 /* When Path MTU discovery is disabled the value specified here will
2385 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2386 * include the flag SPP_PMTUD_DISABLE for this field to have any
2389 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2391 trans->pathmtu = params->spp_pathmtu;
2392 sctp_assoc_sync_pmtu(asoc);
2394 asoc->pathmtu = params->spp_pathmtu;
2396 sp->pathmtu = params->spp_pathmtu;
2402 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2403 (params->spp_flags & SPP_PMTUD_ENABLE);
2404 trans->param_flags =
2405 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2407 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2408 sctp_assoc_sync_pmtu(asoc);
2412 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2415 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2419 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2420 * value of this field is ignored. Note also that a value of zero
2421 * indicates the current setting should be left unchanged.
2423 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2426 msecs_to_jiffies(params->spp_sackdelay);
2429 msecs_to_jiffies(params->spp_sackdelay);
2431 sp->sackdelay = params->spp_sackdelay;
2435 if (sackdelay_change) {
2437 trans->param_flags =
2438 (trans->param_flags & ~SPP_SACKDELAY) |
2442 (asoc->param_flags & ~SPP_SACKDELAY) |
2446 (sp->param_flags & ~SPP_SACKDELAY) |
2451 /* Note that a value of zero indicates the current setting should be
2454 if (params->spp_pathmaxrxt) {
2456 trans->pathmaxrxt = params->spp_pathmaxrxt;
2458 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2460 sp->pathmaxrxt = params->spp_pathmaxrxt;
2467 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2468 char __user *optval,
2469 unsigned int optlen)
2471 struct sctp_paddrparams params;
2472 struct sctp_transport *trans = NULL;
2473 struct sctp_association *asoc = NULL;
2474 struct sctp_sock *sp = sctp_sk(sk);
2476 int hb_change, pmtud_change, sackdelay_change;
2478 if (optlen != sizeof(struct sctp_paddrparams))
2481 if (copy_from_user(¶ms, optval, optlen))
2484 /* Validate flags and value parameters. */
2485 hb_change = params.spp_flags & SPP_HB;
2486 pmtud_change = params.spp_flags & SPP_PMTUD;
2487 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2489 if (hb_change == SPP_HB ||
2490 pmtud_change == SPP_PMTUD ||
2491 sackdelay_change == SPP_SACKDELAY ||
2492 params.spp_sackdelay > 500 ||
2493 (params.spp_pathmtu &&
2494 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2497 /* If an address other than INADDR_ANY is specified, and
2498 * no transport is found, then the request is invalid.
2500 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2501 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2502 params.spp_assoc_id);
2507 /* Get association, if assoc_id != 0 and the socket is a one
2508 * to many style socket, and an association was not found, then
2509 * the id was invalid.
2511 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2512 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2515 /* Heartbeat demand can only be sent on a transport or
2516 * association, but not a socket.
2518 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2521 /* Process parameters. */
2522 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2523 hb_change, pmtud_change,
2529 /* If changes are for association, also apply parameters to each
2532 if (!trans && asoc) {
2533 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2535 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2536 hb_change, pmtud_change,
2544 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2546 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2549 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2551 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2555 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2557 * This option will effect the way delayed acks are performed. This
2558 * option allows you to get or set the delayed ack time, in
2559 * milliseconds. It also allows changing the delayed ack frequency.
2560 * Changing the frequency to 1 disables the delayed sack algorithm. If
2561 * the assoc_id is 0, then this sets or gets the endpoints default
2562 * values. If the assoc_id field is non-zero, then the set or get
2563 * effects the specified association for the one to many model (the
2564 * assoc_id field is ignored by the one to one model). Note that if
2565 * sack_delay or sack_freq are 0 when setting this option, then the
2566 * current values will remain unchanged.
2568 * struct sctp_sack_info {
2569 * sctp_assoc_t sack_assoc_id;
2570 * uint32_t sack_delay;
2571 * uint32_t sack_freq;
2574 * sack_assoc_id - This parameter, indicates which association the user
2575 * is performing an action upon. Note that if this field's value is
2576 * zero then the endpoints default value is changed (effecting future
2577 * associations only).
2579 * sack_delay - This parameter contains the number of milliseconds that
2580 * the user is requesting the delayed ACK timer be set to. Note that
2581 * this value is defined in the standard to be between 200 and 500
2584 * sack_freq - This parameter contains the number of packets that must
2585 * be received before a sack is sent without waiting for the delay
2586 * timer to expire. The default value for this is 2, setting this
2587 * value to 1 will disable the delayed sack algorithm.
2590 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2591 char __user *optval, unsigned int optlen)
2593 struct sctp_sack_info params;
2594 struct sctp_transport *trans = NULL;
2595 struct sctp_association *asoc = NULL;
2596 struct sctp_sock *sp = sctp_sk(sk);
2598 if (optlen == sizeof(struct sctp_sack_info)) {
2599 if (copy_from_user(¶ms, optval, optlen))
2602 if (params.sack_delay == 0 && params.sack_freq == 0)
2604 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2605 pr_warn_ratelimited(DEPRECATED
2607 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2608 "Use struct sctp_sack_info instead\n",
2609 current->comm, task_pid_nr(current));
2610 if (copy_from_user(¶ms, optval, optlen))
2613 if (params.sack_delay == 0)
2614 params.sack_freq = 1;
2616 params.sack_freq = 0;
2620 /* Validate value parameter. */
2621 if (params.sack_delay > 500)
2624 /* Get association, if sack_assoc_id != 0 and the socket is a one
2625 * to many style socket, and an association was not found, then
2626 * the id was invalid.
2628 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2629 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2632 if (params.sack_delay) {
2635 msecs_to_jiffies(params.sack_delay);
2637 sctp_spp_sackdelay_enable(asoc->param_flags);
2639 sp->sackdelay = params.sack_delay;
2641 sctp_spp_sackdelay_enable(sp->param_flags);
2645 if (params.sack_freq == 1) {
2648 sctp_spp_sackdelay_disable(asoc->param_flags);
2651 sctp_spp_sackdelay_disable(sp->param_flags);
2653 } else if (params.sack_freq > 1) {
2655 asoc->sackfreq = params.sack_freq;
2657 sctp_spp_sackdelay_enable(asoc->param_flags);
2659 sp->sackfreq = params.sack_freq;
2661 sctp_spp_sackdelay_enable(sp->param_flags);
2665 /* If change is for association, also apply to each transport. */
2667 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2669 if (params.sack_delay) {
2671 msecs_to_jiffies(params.sack_delay);
2672 trans->param_flags =
2673 sctp_spp_sackdelay_enable(trans->param_flags);
2675 if (params.sack_freq == 1) {
2676 trans->param_flags =
2677 sctp_spp_sackdelay_disable(trans->param_flags);
2678 } else if (params.sack_freq > 1) {
2679 trans->sackfreq = params.sack_freq;
2680 trans->param_flags =
2681 sctp_spp_sackdelay_enable(trans->param_flags);
2689 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2691 * Applications can specify protocol parameters for the default association
2692 * initialization. The option name argument to setsockopt() and getsockopt()
2695 * Setting initialization parameters is effective only on an unconnected
2696 * socket (for UDP-style sockets only future associations are effected
2697 * by the change). With TCP-style sockets, this option is inherited by
2698 * sockets derived from a listener socket.
2700 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2702 struct sctp_initmsg sinit;
2703 struct sctp_sock *sp = sctp_sk(sk);
2705 if (optlen != sizeof(struct sctp_initmsg))
2707 if (copy_from_user(&sinit, optval, optlen))
2710 if (sinit.sinit_num_ostreams)
2711 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2712 if (sinit.sinit_max_instreams)
2713 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2714 if (sinit.sinit_max_attempts)
2715 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2716 if (sinit.sinit_max_init_timeo)
2717 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2723 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2725 * Applications that wish to use the sendto() system call may wish to
2726 * specify a default set of parameters that would normally be supplied
2727 * through the inclusion of ancillary data. This socket option allows
2728 * such an application to set the default sctp_sndrcvinfo structure.
2729 * The application that wishes to use this socket option simply passes
2730 * in to this call the sctp_sndrcvinfo structure defined in Section
2731 * 5.2.2) The input parameters accepted by this call include
2732 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2733 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2734 * to this call if the caller is using the UDP model.
2736 static int sctp_setsockopt_default_send_param(struct sock *sk,
2737 char __user *optval,
2738 unsigned int optlen)
2740 struct sctp_sock *sp = sctp_sk(sk);
2741 struct sctp_association *asoc;
2742 struct sctp_sndrcvinfo info;
2744 if (optlen != sizeof(info))
2746 if (copy_from_user(&info, optval, optlen))
2748 if (info.sinfo_flags &
2749 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2750 SCTP_ABORT | SCTP_EOF))
2753 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2754 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2757 asoc->default_stream = info.sinfo_stream;
2758 asoc->default_flags = info.sinfo_flags;
2759 asoc->default_ppid = info.sinfo_ppid;
2760 asoc->default_context = info.sinfo_context;
2761 asoc->default_timetolive = info.sinfo_timetolive;
2763 sp->default_stream = info.sinfo_stream;
2764 sp->default_flags = info.sinfo_flags;
2765 sp->default_ppid = info.sinfo_ppid;
2766 sp->default_context = info.sinfo_context;
2767 sp->default_timetolive = info.sinfo_timetolive;
2773 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2774 * (SCTP_DEFAULT_SNDINFO)
2776 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2777 char __user *optval,
2778 unsigned int optlen)
2780 struct sctp_sock *sp = sctp_sk(sk);
2781 struct sctp_association *asoc;
2782 struct sctp_sndinfo info;
2784 if (optlen != sizeof(info))
2786 if (copy_from_user(&info, optval, optlen))
2788 if (info.snd_flags &
2789 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2790 SCTP_ABORT | SCTP_EOF))
2793 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2794 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2797 asoc->default_stream = info.snd_sid;
2798 asoc->default_flags = info.snd_flags;
2799 asoc->default_ppid = info.snd_ppid;
2800 asoc->default_context = info.snd_context;
2802 sp->default_stream = info.snd_sid;
2803 sp->default_flags = info.snd_flags;
2804 sp->default_ppid = info.snd_ppid;
2805 sp->default_context = info.snd_context;
2811 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2813 * Requests that the local SCTP stack use the enclosed peer address as
2814 * the association primary. The enclosed address must be one of the
2815 * association peer's addresses.
2817 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2818 unsigned int optlen)
2820 struct sctp_prim prim;
2821 struct sctp_transport *trans;
2823 if (optlen != sizeof(struct sctp_prim))
2826 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2829 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2833 sctp_assoc_set_primary(trans->asoc, trans);
2839 * 7.1.5 SCTP_NODELAY
2841 * Turn on/off any Nagle-like algorithm. This means that packets are
2842 * generally sent as soon as possible and no unnecessary delays are
2843 * introduced, at the cost of more packets in the network. Expects an
2844 * integer boolean flag.
2846 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2847 unsigned int optlen)
2851 if (optlen < sizeof(int))
2853 if (get_user(val, (int __user *)optval))
2856 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2862 * 7.1.1 SCTP_RTOINFO
2864 * The protocol parameters used to initialize and bound retransmission
2865 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2866 * and modify these parameters.
2867 * All parameters are time values, in milliseconds. A value of 0, when
2868 * modifying the parameters, indicates that the current value should not
2872 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2874 struct sctp_rtoinfo rtoinfo;
2875 struct sctp_association *asoc;
2876 unsigned long rto_min, rto_max;
2877 struct sctp_sock *sp = sctp_sk(sk);
2879 if (optlen != sizeof (struct sctp_rtoinfo))
2882 if (copy_from_user(&rtoinfo, optval, optlen))
2885 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2887 /* Set the values to the specific association */
2888 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2891 rto_max = rtoinfo.srto_max;
2892 rto_min = rtoinfo.srto_min;
2895 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2897 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2900 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2902 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2904 if (rto_min > rto_max)
2908 if (rtoinfo.srto_initial != 0)
2910 msecs_to_jiffies(rtoinfo.srto_initial);
2911 asoc->rto_max = rto_max;
2912 asoc->rto_min = rto_min;
2914 /* If there is no association or the association-id = 0
2915 * set the values to the endpoint.
2917 if (rtoinfo.srto_initial != 0)
2918 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2919 sp->rtoinfo.srto_max = rto_max;
2920 sp->rtoinfo.srto_min = rto_min;
2928 * 7.1.2 SCTP_ASSOCINFO
2930 * This option is used to tune the maximum retransmission attempts
2931 * of the association.
2932 * Returns an error if the new association retransmission value is
2933 * greater than the sum of the retransmission value of the peer.
2934 * See [SCTP] for more information.
2937 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2940 struct sctp_assocparams assocparams;
2941 struct sctp_association *asoc;
2943 if (optlen != sizeof(struct sctp_assocparams))
2945 if (copy_from_user(&assocparams, optval, optlen))
2948 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2950 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2953 /* Set the values to the specific association */
2955 if (assocparams.sasoc_asocmaxrxt != 0) {
2958 struct sctp_transport *peer_addr;
2960 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2962 path_sum += peer_addr->pathmaxrxt;
2966 /* Only validate asocmaxrxt if we have more than
2967 * one path/transport. We do this because path
2968 * retransmissions are only counted when we have more
2972 assocparams.sasoc_asocmaxrxt > path_sum)
2975 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2978 if (assocparams.sasoc_cookie_life != 0)
2979 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
2981 /* Set the values to the endpoint */
2982 struct sctp_sock *sp = sctp_sk(sk);
2984 if (assocparams.sasoc_asocmaxrxt != 0)
2985 sp->assocparams.sasoc_asocmaxrxt =
2986 assocparams.sasoc_asocmaxrxt;
2987 if (assocparams.sasoc_cookie_life != 0)
2988 sp->assocparams.sasoc_cookie_life =
2989 assocparams.sasoc_cookie_life;
2995 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2997 * This socket option is a boolean flag which turns on or off mapped V4
2998 * addresses. If this option is turned on and the socket is type
2999 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3000 * If this option is turned off, then no mapping will be done of V4
3001 * addresses and a user will receive both PF_INET6 and PF_INET type
3002 * addresses on the socket.
3004 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3007 struct sctp_sock *sp = sctp_sk(sk);
3009 if (optlen < sizeof(int))
3011 if (get_user(val, (int __user *)optval))
3022 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3023 * This option will get or set the maximum size to put in any outgoing
3024 * SCTP DATA chunk. If a message is larger than this size it will be
3025 * fragmented by SCTP into the specified size. Note that the underlying
3026 * SCTP implementation may fragment into smaller sized chunks when the
3027 * PMTU of the underlying association is smaller than the value set by
3028 * the user. The default value for this option is '0' which indicates
3029 * the user is NOT limiting fragmentation and only the PMTU will effect
3030 * SCTP's choice of DATA chunk size. Note also that values set larger
3031 * than the maximum size of an IP datagram will effectively let SCTP
3032 * control fragmentation (i.e. the same as setting this option to 0).
3034 * The following structure is used to access and modify this parameter:
3036 * struct sctp_assoc_value {
3037 * sctp_assoc_t assoc_id;
3038 * uint32_t assoc_value;
3041 * assoc_id: This parameter is ignored for one-to-one style sockets.
3042 * For one-to-many style sockets this parameter indicates which
3043 * association the user is performing an action upon. Note that if
3044 * this field's value is zero then the endpoints default value is
3045 * changed (effecting future associations only).
3046 * assoc_value: This parameter specifies the maximum size in bytes.
3048 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3050 struct sctp_sock *sp = sctp_sk(sk);
3051 struct sctp_assoc_value params;
3052 struct sctp_association *asoc;
3055 if (optlen == sizeof(int)) {
3056 pr_warn_ratelimited(DEPRECATED
3058 "Use of int in maxseg socket option.\n"
3059 "Use struct sctp_assoc_value instead\n",
3060 current->comm, task_pid_nr(current));
3061 if (copy_from_user(&val, optval, optlen))
3063 params.assoc_id = 0;
3064 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3065 if (copy_from_user(¶ms, optval, optlen))
3067 val = params.assoc_value;
3073 int min_len, max_len;
3075 min_len = SCTP_DEFAULT_MINSEGMENT - sp->pf->af->net_header_len;
3076 min_len -= sizeof(struct sctphdr) +
3077 sizeof(struct sctp_data_chunk);
3079 max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
3081 if (val < min_len || val > max_len)
3085 asoc = sctp_id2assoc(sk, params.assoc_id);
3088 val = asoc->pathmtu - sp->pf->af->net_header_len;
3089 val -= sizeof(struct sctphdr) +
3090 sctp_datachk_len(&asoc->stream);
3092 asoc->user_frag = val;
3093 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3095 if (params.assoc_id && sctp_style(sk, UDP))
3097 sp->user_frag = val;
3105 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3107 * Requests that the peer mark the enclosed address as the association
3108 * primary. The enclosed address must be one of the association's
3109 * locally bound addresses. The following structure is used to make a
3110 * set primary request:
3112 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3113 unsigned int optlen)
3115 struct net *net = sock_net(sk);
3116 struct sctp_sock *sp;
3117 struct sctp_association *asoc = NULL;
3118 struct sctp_setpeerprim prim;
3119 struct sctp_chunk *chunk;
3125 if (!net->sctp.addip_enable)
3128 if (optlen != sizeof(struct sctp_setpeerprim))
3131 if (copy_from_user(&prim, optval, optlen))
3134 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3138 if (!asoc->peer.asconf_capable)
3141 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3144 if (!sctp_state(asoc, ESTABLISHED))
3147 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3151 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3152 return -EADDRNOTAVAIL;
3154 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3155 return -EADDRNOTAVAIL;
3157 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3158 chunk = sctp_make_asconf_set_prim(asoc,
3159 (union sctp_addr *)&prim.sspp_addr);
3163 err = sctp_send_asconf(asoc, chunk);
3165 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3170 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3171 unsigned int optlen)
3173 struct sctp_setadaptation adaptation;
3175 if (optlen != sizeof(struct sctp_setadaptation))
3177 if (copy_from_user(&adaptation, optval, optlen))
3180 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3186 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3188 * The context field in the sctp_sndrcvinfo structure is normally only
3189 * used when a failed message is retrieved holding the value that was
3190 * sent down on the actual send call. This option allows the setting of
3191 * a default context on an association basis that will be received on
3192 * reading messages from the peer. This is especially helpful in the
3193 * one-2-many model for an application to keep some reference to an
3194 * internal state machine that is processing messages on the
3195 * association. Note that the setting of this value only effects
3196 * received messages from the peer and does not effect the value that is
3197 * saved with outbound messages.
3199 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3200 unsigned int optlen)
3202 struct sctp_assoc_value params;
3203 struct sctp_sock *sp;
3204 struct sctp_association *asoc;
3206 if (optlen != sizeof(struct sctp_assoc_value))
3208 if (copy_from_user(¶ms, optval, optlen))
3213 if (params.assoc_id != 0) {
3214 asoc = sctp_id2assoc(sk, params.assoc_id);
3217 asoc->default_rcv_context = params.assoc_value;
3219 sp->default_rcv_context = params.assoc_value;
3226 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3228 * This options will at a minimum specify if the implementation is doing
3229 * fragmented interleave. Fragmented interleave, for a one to many
3230 * socket, is when subsequent calls to receive a message may return
3231 * parts of messages from different associations. Some implementations
3232 * may allow you to turn this value on or off. If so, when turned off,
3233 * no fragment interleave will occur (which will cause a head of line
3234 * blocking amongst multiple associations sharing the same one to many
3235 * socket). When this option is turned on, then each receive call may
3236 * come from a different association (thus the user must receive data
3237 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3238 * association each receive belongs to.
3240 * This option takes a boolean value. A non-zero value indicates that
3241 * fragmented interleave is on. A value of zero indicates that
3242 * fragmented interleave is off.
3244 * Note that it is important that an implementation that allows this
3245 * option to be turned on, have it off by default. Otherwise an unaware
3246 * application using the one to many model may become confused and act
3249 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3250 char __user *optval,
3251 unsigned int optlen)
3255 if (optlen != sizeof(int))
3257 if (get_user(val, (int __user *)optval))
3260 sctp_sk(sk)->frag_interleave = !!val;
3262 if (!sctp_sk(sk)->frag_interleave)
3263 sctp_sk(sk)->strm_interleave = 0;
3269 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3270 * (SCTP_PARTIAL_DELIVERY_POINT)
3272 * This option will set or get the SCTP partial delivery point. This
3273 * point is the size of a message where the partial delivery API will be
3274 * invoked to help free up rwnd space for the peer. Setting this to a
3275 * lower value will cause partial deliveries to happen more often. The
3276 * calls argument is an integer that sets or gets the partial delivery
3277 * point. Note also that the call will fail if the user attempts to set
3278 * this value larger than the socket receive buffer size.
3280 * Note that any single message having a length smaller than or equal to
3281 * the SCTP partial delivery point will be delivered in one single read
3282 * call as long as the user provided buffer is large enough to hold the
3285 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3286 char __user *optval,
3287 unsigned int optlen)
3291 if (optlen != sizeof(u32))
3293 if (get_user(val, (int __user *)optval))
3296 /* Note: We double the receive buffer from what the user sets
3297 * it to be, also initial rwnd is based on rcvbuf/2.
3299 if (val > (sk->sk_rcvbuf >> 1))
3302 sctp_sk(sk)->pd_point = val;
3304 return 0; /* is this the right error code? */
3308 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3310 * This option will allow a user to change the maximum burst of packets
3311 * that can be emitted by this association. Note that the default value
3312 * is 4, and some implementations may restrict this setting so that it
3313 * can only be lowered.
3315 * NOTE: This text doesn't seem right. Do this on a socket basis with
3316 * future associations inheriting the socket value.
3318 static int sctp_setsockopt_maxburst(struct sock *sk,
3319 char __user *optval,
3320 unsigned int optlen)
3322 struct sctp_assoc_value params;
3323 struct sctp_sock *sp;
3324 struct sctp_association *asoc;
3328 if (optlen == sizeof(int)) {
3329 pr_warn_ratelimited(DEPRECATED
3331 "Use of int in max_burst socket option deprecated.\n"
3332 "Use struct sctp_assoc_value instead\n",
3333 current->comm, task_pid_nr(current));
3334 if (copy_from_user(&val, optval, optlen))
3336 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3337 if (copy_from_user(¶ms, optval, optlen))
3339 val = params.assoc_value;
3340 assoc_id = params.assoc_id;
3346 if (assoc_id != 0) {
3347 asoc = sctp_id2assoc(sk, assoc_id);
3350 asoc->max_burst = val;
3352 sp->max_burst = val;
3358 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3360 * This set option adds a chunk type that the user is requesting to be
3361 * received only in an authenticated way. Changes to the list of chunks
3362 * will only effect future associations on the socket.
3364 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3365 char __user *optval,
3366 unsigned int optlen)
3368 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3369 struct sctp_authchunk val;
3371 if (!ep->auth_enable)
3374 if (optlen != sizeof(struct sctp_authchunk))
3376 if (copy_from_user(&val, optval, optlen))
3379 switch (val.sauth_chunk) {
3381 case SCTP_CID_INIT_ACK:
3382 case SCTP_CID_SHUTDOWN_COMPLETE:
3387 /* add this chunk id to the endpoint */
3388 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3392 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3394 * This option gets or sets the list of HMAC algorithms that the local
3395 * endpoint requires the peer to use.
3397 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3398 char __user *optval,
3399 unsigned int optlen)
3401 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3402 struct sctp_hmacalgo *hmacs;
3406 if (!ep->auth_enable)
3409 if (optlen < sizeof(struct sctp_hmacalgo))
3411 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3412 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3414 hmacs = memdup_user(optval, optlen);
3416 return PTR_ERR(hmacs);
3418 idents = hmacs->shmac_num_idents;
3419 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3420 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3425 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3432 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3434 * This option will set a shared secret key which is used to build an
3435 * association shared key.
3437 static int sctp_setsockopt_auth_key(struct sock *sk,
3438 char __user *optval,
3439 unsigned int optlen)
3441 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3442 struct sctp_authkey *authkey;
3443 struct sctp_association *asoc;
3446 if (!ep->auth_enable)
3449 if (optlen <= sizeof(struct sctp_authkey))
3451 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3454 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3455 sizeof(struct sctp_authkey));
3457 authkey = memdup_user(optval, optlen);
3458 if (IS_ERR(authkey))
3459 return PTR_ERR(authkey);
3461 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3466 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3467 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3472 ret = sctp_auth_set_key(ep, asoc, authkey);
3479 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3481 * This option will get or set the active shared key to be used to build
3482 * the association shared key.
3484 static int sctp_setsockopt_active_key(struct sock *sk,
3485 char __user *optval,
3486 unsigned int optlen)
3488 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3489 struct sctp_authkeyid val;
3490 struct sctp_association *asoc;
3492 if (!ep->auth_enable)
3495 if (optlen != sizeof(struct sctp_authkeyid))
3497 if (copy_from_user(&val, optval, optlen))
3500 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3501 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3504 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3508 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3510 * This set option will delete a shared secret key from use.
3512 static int sctp_setsockopt_del_key(struct sock *sk,
3513 char __user *optval,
3514 unsigned int optlen)
3516 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3517 struct sctp_authkeyid val;
3518 struct sctp_association *asoc;
3520 if (!ep->auth_enable)
3523 if (optlen != sizeof(struct sctp_authkeyid))
3525 if (copy_from_user(&val, optval, optlen))
3528 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3529 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3532 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3537 * 8.1.23 SCTP_AUTO_ASCONF
3539 * This option will enable or disable the use of the automatic generation of
3540 * ASCONF chunks to add and delete addresses to an existing association. Note
3541 * that this option has two caveats namely: a) it only affects sockets that
3542 * are bound to all addresses available to the SCTP stack, and b) the system
3543 * administrator may have an overriding control that turns the ASCONF feature
3544 * off no matter what setting the socket option may have.
3545 * This option expects an integer boolean flag, where a non-zero value turns on
3546 * the option, and a zero value turns off the option.
3547 * Note. In this implementation, socket operation overrides default parameter
3548 * being set by sysctl as well as FreeBSD implementation
3550 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3551 unsigned int optlen)
3554 struct sctp_sock *sp = sctp_sk(sk);
3556 if (optlen < sizeof(int))
3558 if (get_user(val, (int __user *)optval))
3560 if (!sctp_is_ep_boundall(sk) && val)
3562 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3565 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3566 if (val == 0 && sp->do_auto_asconf) {
3567 list_del(&sp->auto_asconf_list);
3568 sp->do_auto_asconf = 0;
3569 } else if (val && !sp->do_auto_asconf) {
3570 list_add_tail(&sp->auto_asconf_list,
3571 &sock_net(sk)->sctp.auto_asconf_splist);
3572 sp->do_auto_asconf = 1;
3574 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3579 * SCTP_PEER_ADDR_THLDS
3581 * This option allows us to alter the partially failed threshold for one or all
3582 * transports in an association. See Section 6.1 of:
3583 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3585 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3586 char __user *optval,
3587 unsigned int optlen)
3589 struct sctp_paddrthlds val;
3590 struct sctp_transport *trans;
3591 struct sctp_association *asoc;
3593 if (optlen < sizeof(struct sctp_paddrthlds))
3595 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3596 sizeof(struct sctp_paddrthlds)))
3600 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3601 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3604 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3606 if (val.spt_pathmaxrxt)
3607 trans->pathmaxrxt = val.spt_pathmaxrxt;
3608 trans->pf_retrans = val.spt_pathpfthld;
3611 if (val.spt_pathmaxrxt)
3612 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3613 asoc->pf_retrans = val.spt_pathpfthld;
3615 trans = sctp_addr_id2transport(sk, &val.spt_address,
3620 if (val.spt_pathmaxrxt)
3621 trans->pathmaxrxt = val.spt_pathmaxrxt;
3622 trans->pf_retrans = val.spt_pathpfthld;
3628 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3629 char __user *optval,
3630 unsigned int optlen)
3634 if (optlen < sizeof(int))
3636 if (get_user(val, (int __user *) optval))
3639 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3644 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3645 char __user *optval,
3646 unsigned int optlen)
3650 if (optlen < sizeof(int))
3652 if (get_user(val, (int __user *) optval))
3655 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3660 static int sctp_setsockopt_pr_supported(struct sock *sk,
3661 char __user *optval,
3662 unsigned int optlen)
3664 struct sctp_assoc_value params;
3665 struct sctp_association *asoc;
3666 int retval = -EINVAL;
3668 if (optlen != sizeof(params))
3671 if (copy_from_user(¶ms, optval, optlen)) {
3676 asoc = sctp_id2assoc(sk, params.assoc_id);
3678 asoc->prsctp_enable = !!params.assoc_value;
3679 } else if (!params.assoc_id) {
3680 struct sctp_sock *sp = sctp_sk(sk);
3682 sp->ep->prsctp_enable = !!params.assoc_value;
3693 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3694 char __user *optval,
3695 unsigned int optlen)
3697 struct sctp_default_prinfo info;
3698 struct sctp_association *asoc;
3699 int retval = -EINVAL;
3701 if (optlen != sizeof(info))
3704 if (copy_from_user(&info, optval, sizeof(info))) {
3709 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3712 if (info.pr_policy == SCTP_PR_SCTP_NONE)
3715 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3717 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3718 asoc->default_timetolive = info.pr_value;
3719 } else if (!info.pr_assoc_id) {
3720 struct sctp_sock *sp = sctp_sk(sk);
3722 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3723 sp->default_timetolive = info.pr_value;
3734 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3735 char __user *optval,
3736 unsigned int optlen)
3738 struct sctp_assoc_value params;
3739 struct sctp_association *asoc;
3740 int retval = -EINVAL;
3742 if (optlen != sizeof(params))
3745 if (copy_from_user(¶ms, optval, optlen)) {
3750 asoc = sctp_id2assoc(sk, params.assoc_id);
3752 asoc->reconf_enable = !!params.assoc_value;
3753 } else if (!params.assoc_id) {
3754 struct sctp_sock *sp = sctp_sk(sk);
3756 sp->ep->reconf_enable = !!params.assoc_value;
3767 static int sctp_setsockopt_enable_strreset(struct sock *sk,
3768 char __user *optval,
3769 unsigned int optlen)
3771 struct sctp_assoc_value params;
3772 struct sctp_association *asoc;
3773 int retval = -EINVAL;
3775 if (optlen != sizeof(params))
3778 if (copy_from_user(¶ms, optval, optlen)) {
3783 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
3786 asoc = sctp_id2assoc(sk, params.assoc_id);
3788 asoc->strreset_enable = params.assoc_value;
3789 } else if (!params.assoc_id) {
3790 struct sctp_sock *sp = sctp_sk(sk);
3792 sp->ep->strreset_enable = params.assoc_value;
3803 static int sctp_setsockopt_reset_streams(struct sock *sk,
3804 char __user *optval,
3805 unsigned int optlen)
3807 struct sctp_reset_streams *params;
3808 struct sctp_association *asoc;
3809 int retval = -EINVAL;
3811 if (optlen < sizeof(*params))
3813 /* srs_number_streams is u16, so optlen can't be bigger than this. */
3814 optlen = min_t(unsigned int, optlen, USHRT_MAX +
3815 sizeof(__u16) * sizeof(*params));
3817 params = memdup_user(optval, optlen);
3819 return PTR_ERR(params);
3821 if (params->srs_number_streams * sizeof(__u16) >
3822 optlen - sizeof(*params))
3825 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
3829 retval = sctp_send_reset_streams(asoc, params);
3836 static int sctp_setsockopt_reset_assoc(struct sock *sk,
3837 char __user *optval,
3838 unsigned int optlen)
3840 struct sctp_association *asoc;
3841 sctp_assoc_t associd;
3842 int retval = -EINVAL;
3844 if (optlen != sizeof(associd))
3847 if (copy_from_user(&associd, optval, optlen)) {
3852 asoc = sctp_id2assoc(sk, associd);
3856 retval = sctp_send_reset_assoc(asoc);
3862 static int sctp_setsockopt_add_streams(struct sock *sk,
3863 char __user *optval,
3864 unsigned int optlen)
3866 struct sctp_association *asoc;
3867 struct sctp_add_streams params;
3868 int retval = -EINVAL;
3870 if (optlen != sizeof(params))
3873 if (copy_from_user(¶ms, optval, optlen)) {
3878 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
3882 retval = sctp_send_add_streams(asoc, ¶ms);
3888 static int sctp_setsockopt_scheduler(struct sock *sk,
3889 char __user *optval,
3890 unsigned int optlen)
3892 struct sctp_association *asoc;
3893 struct sctp_assoc_value params;
3894 int retval = -EINVAL;
3896 if (optlen < sizeof(params))
3899 optlen = sizeof(params);
3900 if (copy_from_user(¶ms, optval, optlen)) {
3905 if (params.assoc_value > SCTP_SS_MAX)
3908 asoc = sctp_id2assoc(sk, params.assoc_id);
3912 retval = sctp_sched_set_sched(asoc, params.assoc_value);
3918 static int sctp_setsockopt_scheduler_value(struct sock *sk,
3919 char __user *optval,
3920 unsigned int optlen)
3922 struct sctp_association *asoc;
3923 struct sctp_stream_value params;
3924 int retval = -EINVAL;
3926 if (optlen < sizeof(params))
3929 optlen = sizeof(params);
3930 if (copy_from_user(¶ms, optval, optlen)) {
3935 asoc = sctp_id2assoc(sk, params.assoc_id);
3939 retval = sctp_sched_set_value(asoc, params.stream_id,
3940 params.stream_value, GFP_KERNEL);
3946 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
3947 char __user *optval,
3948 unsigned int optlen)
3950 struct sctp_sock *sp = sctp_sk(sk);
3951 struct net *net = sock_net(sk);
3952 struct sctp_assoc_value params;
3953 int retval = -EINVAL;
3955 if (optlen < sizeof(params))
3958 optlen = sizeof(params);
3959 if (copy_from_user(¶ms, optval, optlen)) {
3964 if (params.assoc_id)
3967 if (!net->sctp.intl_enable || !sp->frag_interleave) {
3972 sp->strm_interleave = !!params.assoc_value;
3980 /* API 6.2 setsockopt(), getsockopt()
3982 * Applications use setsockopt() and getsockopt() to set or retrieve
3983 * socket options. Socket options are used to change the default
3984 * behavior of sockets calls. They are described in Section 7.
3988 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3989 * int __user *optlen);
3990 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3993 * sd - the socket descript.
3994 * level - set to IPPROTO_SCTP for all SCTP options.
3995 * optname - the option name.
3996 * optval - the buffer to store the value of the option.
3997 * optlen - the size of the buffer.
3999 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4000 char __user *optval, unsigned int optlen)
4004 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4006 /* I can hardly begin to describe how wrong this is. This is
4007 * so broken as to be worse than useless. The API draft
4008 * REALLY is NOT helpful here... I am not convinced that the
4009 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4010 * are at all well-founded.
4012 if (level != SOL_SCTP) {
4013 struct sctp_af *af = sctp_sk(sk)->pf->af;
4014 retval = af->setsockopt(sk, level, optname, optval, optlen);
4021 case SCTP_SOCKOPT_BINDX_ADD:
4022 /* 'optlen' is the size of the addresses buffer. */
4023 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4024 optlen, SCTP_BINDX_ADD_ADDR);
4027 case SCTP_SOCKOPT_BINDX_REM:
4028 /* 'optlen' is the size of the addresses buffer. */
4029 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4030 optlen, SCTP_BINDX_REM_ADDR);
4033 case SCTP_SOCKOPT_CONNECTX_OLD:
4034 /* 'optlen' is the size of the addresses buffer. */
4035 retval = sctp_setsockopt_connectx_old(sk,
4036 (struct sockaddr __user *)optval,
4040 case SCTP_SOCKOPT_CONNECTX:
4041 /* 'optlen' is the size of the addresses buffer. */
4042 retval = sctp_setsockopt_connectx(sk,
4043 (struct sockaddr __user *)optval,
4047 case SCTP_DISABLE_FRAGMENTS:
4048 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4052 retval = sctp_setsockopt_events(sk, optval, optlen);
4055 case SCTP_AUTOCLOSE:
4056 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4059 case SCTP_PEER_ADDR_PARAMS:
4060 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4063 case SCTP_DELAYED_SACK:
4064 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4066 case SCTP_PARTIAL_DELIVERY_POINT:
4067 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4071 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4073 case SCTP_DEFAULT_SEND_PARAM:
4074 retval = sctp_setsockopt_default_send_param(sk, optval,
4077 case SCTP_DEFAULT_SNDINFO:
4078 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4080 case SCTP_PRIMARY_ADDR:
4081 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4083 case SCTP_SET_PEER_PRIMARY_ADDR:
4084 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4087 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4090 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4092 case SCTP_ASSOCINFO:
4093 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4095 case SCTP_I_WANT_MAPPED_V4_ADDR:
4096 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4099 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4101 case SCTP_ADAPTATION_LAYER:
4102 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4105 retval = sctp_setsockopt_context(sk, optval, optlen);
4107 case SCTP_FRAGMENT_INTERLEAVE:
4108 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4110 case SCTP_MAX_BURST:
4111 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4113 case SCTP_AUTH_CHUNK:
4114 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4116 case SCTP_HMAC_IDENT:
4117 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4120 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4122 case SCTP_AUTH_ACTIVE_KEY:
4123 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4125 case SCTP_AUTH_DELETE_KEY:
4126 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4128 case SCTP_AUTO_ASCONF:
4129 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4131 case SCTP_PEER_ADDR_THLDS:
4132 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4134 case SCTP_RECVRCVINFO:
4135 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4137 case SCTP_RECVNXTINFO:
4138 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4140 case SCTP_PR_SUPPORTED:
4141 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4143 case SCTP_DEFAULT_PRINFO:
4144 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4146 case SCTP_RECONFIG_SUPPORTED:
4147 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4149 case SCTP_ENABLE_STREAM_RESET:
4150 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4152 case SCTP_RESET_STREAMS:
4153 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4155 case SCTP_RESET_ASSOC:
4156 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4158 case SCTP_ADD_STREAMS:
4159 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4161 case SCTP_STREAM_SCHEDULER:
4162 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4164 case SCTP_STREAM_SCHEDULER_VALUE:
4165 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4167 case SCTP_INTERLEAVING_SUPPORTED:
4168 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4172 retval = -ENOPROTOOPT;
4182 /* API 3.1.6 connect() - UDP Style Syntax
4184 * An application may use the connect() call in the UDP model to initiate an
4185 * association without sending data.
4189 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4191 * sd: the socket descriptor to have a new association added to.
4193 * nam: the address structure (either struct sockaddr_in or struct
4194 * sockaddr_in6 defined in RFC2553 [7]).
4196 * len: the size of the address.
4198 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4206 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4209 /* Validate addr_len before calling common connect/connectx routine. */
4210 af = sctp_get_af_specific(addr->sa_family);
4211 if (!af || addr_len < af->sockaddr_len) {
4214 /* Pass correct addr len to common routine (so it knows there
4215 * is only one address being passed.
4217 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
4224 /* FIXME: Write comments. */
4225 static int sctp_disconnect(struct sock *sk, int flags)
4227 return -EOPNOTSUPP; /* STUB */
4230 /* 4.1.4 accept() - TCP Style Syntax
4232 * Applications use accept() call to remove an established SCTP
4233 * association from the accept queue of the endpoint. A new socket
4234 * descriptor will be returned from accept() to represent the newly
4235 * formed association.
4237 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4239 struct sctp_sock *sp;
4240 struct sctp_endpoint *ep;
4241 struct sock *newsk = NULL;
4242 struct sctp_association *asoc;
4251 if (!sctp_style(sk, TCP)) {
4252 error = -EOPNOTSUPP;
4256 if (!sctp_sstate(sk, LISTENING)) {
4261 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4263 error = sctp_wait_for_accept(sk, timeo);
4267 /* We treat the list of associations on the endpoint as the accept
4268 * queue and pick the first association on the list.
4270 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4272 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4278 /* Populate the fields of the newsk from the oldsk and migrate the
4279 * asoc to the newsk.
4281 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4289 /* The SCTP ioctl handler. */
4290 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4297 * SEQPACKET-style sockets in LISTENING state are valid, for
4298 * SCTP, so only discard TCP-style sockets in LISTENING state.
4300 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4305 struct sk_buff *skb;
4306 unsigned int amount = 0;
4308 skb = skb_peek(&sk->sk_receive_queue);
4311 * We will only return the amount of this packet since
4312 * that is all that will be read.
4316 rc = put_user(amount, (int __user *)arg);
4328 /* This is the function which gets called during socket creation to
4329 * initialized the SCTP-specific portion of the sock.
4330 * The sock structure should already be zero-filled memory.
4332 static int sctp_init_sock(struct sock *sk)
4334 struct net *net = sock_net(sk);
4335 struct sctp_sock *sp;
4337 pr_debug("%s: sk:%p\n", __func__, sk);
4341 /* Initialize the SCTP per socket area. */
4342 switch (sk->sk_type) {
4343 case SOCK_SEQPACKET:
4344 sp->type = SCTP_SOCKET_UDP;
4347 sp->type = SCTP_SOCKET_TCP;
4350 return -ESOCKTNOSUPPORT;
4353 sk->sk_gso_type = SKB_GSO_SCTP;
4355 /* Initialize default send parameters. These parameters can be
4356 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4358 sp->default_stream = 0;
4359 sp->default_ppid = 0;
4360 sp->default_flags = 0;
4361 sp->default_context = 0;
4362 sp->default_timetolive = 0;
4364 sp->default_rcv_context = 0;
4365 sp->max_burst = net->sctp.max_burst;
4367 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4369 /* Initialize default setup parameters. These parameters
4370 * can be modified with the SCTP_INITMSG socket option or
4371 * overridden by the SCTP_INIT CMSG.
4373 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4374 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4375 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4376 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4378 /* Initialize default RTO related parameters. These parameters can
4379 * be modified for with the SCTP_RTOINFO socket option.
4381 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4382 sp->rtoinfo.srto_max = net->sctp.rto_max;
4383 sp->rtoinfo.srto_min = net->sctp.rto_min;
4385 /* Initialize default association related parameters. These parameters
4386 * can be modified with the SCTP_ASSOCINFO socket option.
4388 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4389 sp->assocparams.sasoc_number_peer_destinations = 0;
4390 sp->assocparams.sasoc_peer_rwnd = 0;
4391 sp->assocparams.sasoc_local_rwnd = 0;
4392 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4394 /* Initialize default event subscriptions. By default, all the
4397 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4399 /* Default Peer Address Parameters. These defaults can
4400 * be modified via SCTP_PEER_ADDR_PARAMS
4402 sp->hbinterval = net->sctp.hb_interval;
4403 sp->pathmaxrxt = net->sctp.max_retrans_path;
4404 sp->pathmtu = 0; /* allow default discovery */
4405 sp->sackdelay = net->sctp.sack_timeout;
4407 sp->param_flags = SPP_HB_ENABLE |
4409 SPP_SACKDELAY_ENABLE;
4411 /* If enabled no SCTP message fragmentation will be performed.
4412 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4414 sp->disable_fragments = 0;
4416 /* Enable Nagle algorithm by default. */
4419 sp->recvrcvinfo = 0;
4420 sp->recvnxtinfo = 0;
4422 /* Enable by default. */
4425 /* Auto-close idle associations after the configured
4426 * number of seconds. A value of 0 disables this
4427 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4428 * for UDP-style sockets only.
4432 /* User specified fragmentation limit. */
4435 sp->adaptation_ind = 0;
4437 sp->pf = sctp_get_pf_specific(sk->sk_family);
4439 /* Control variables for partial data delivery. */
4440 atomic_set(&sp->pd_mode, 0);
4441 skb_queue_head_init(&sp->pd_lobby);
4442 sp->frag_interleave = 0;
4444 /* Create a per socket endpoint structure. Even if we
4445 * change the data structure relationships, this may still
4446 * be useful for storing pre-connect address information.
4448 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4454 sk->sk_destruct = sctp_destruct_sock;
4456 SCTP_DBG_OBJCNT_INC(sock);
4459 sk_sockets_allocated_inc(sk);
4460 sock_prot_inuse_add(net, sk->sk_prot, 1);
4462 /* Nothing can fail after this block, otherwise
4463 * sctp_destroy_sock() will be called without addr_wq_lock held
4465 if (net->sctp.default_auto_asconf) {
4466 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4467 list_add_tail(&sp->auto_asconf_list,
4468 &net->sctp.auto_asconf_splist);
4469 sp->do_auto_asconf = 1;
4470 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4472 sp->do_auto_asconf = 0;
4480 /* Cleanup any SCTP per socket resources. Must be called with
4481 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4483 static void sctp_destroy_sock(struct sock *sk)
4485 struct sctp_sock *sp;
4487 pr_debug("%s: sk:%p\n", __func__, sk);
4489 /* Release our hold on the endpoint. */
4491 /* This could happen during socket init, thus we bail out
4492 * early, since the rest of the below is not setup either.
4497 if (sp->do_auto_asconf) {
4498 sp->do_auto_asconf = 0;
4499 list_del(&sp->auto_asconf_list);
4501 sctp_endpoint_free(sp->ep);
4503 sk_sockets_allocated_dec(sk);
4504 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4508 /* Triggered when there are no references on the socket anymore */
4509 static void sctp_destruct_sock(struct sock *sk)
4511 struct sctp_sock *sp = sctp_sk(sk);
4513 /* Free up the HMAC transform. */
4514 crypto_free_shash(sp->hmac);
4516 inet_sock_destruct(sk);
4519 /* API 4.1.7 shutdown() - TCP Style Syntax
4520 * int shutdown(int socket, int how);
4522 * sd - the socket descriptor of the association to be closed.
4523 * how - Specifies the type of shutdown. The values are
4526 * Disables further receive operations. No SCTP
4527 * protocol action is taken.
4529 * Disables further send operations, and initiates
4530 * the SCTP shutdown sequence.
4532 * Disables further send and receive operations
4533 * and initiates the SCTP shutdown sequence.
4535 static void sctp_shutdown(struct sock *sk, int how)
4537 struct net *net = sock_net(sk);
4538 struct sctp_endpoint *ep;
4540 if (!sctp_style(sk, TCP))
4543 ep = sctp_sk(sk)->ep;
4544 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4545 struct sctp_association *asoc;
4547 inet_sk_set_state(sk, SCTP_SS_CLOSING);
4548 asoc = list_entry(ep->asocs.next,
4549 struct sctp_association, asocs);
4550 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4554 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4555 struct sctp_info *info)
4557 struct sctp_transport *prim;
4558 struct list_head *pos;
4561 memset(info, 0, sizeof(*info));
4563 struct sctp_sock *sp = sctp_sk(sk);
4565 info->sctpi_s_autoclose = sp->autoclose;
4566 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4567 info->sctpi_s_pd_point = sp->pd_point;
4568 info->sctpi_s_nodelay = sp->nodelay;
4569 info->sctpi_s_disable_fragments = sp->disable_fragments;
4570 info->sctpi_s_v4mapped = sp->v4mapped;
4571 info->sctpi_s_frag_interleave = sp->frag_interleave;
4572 info->sctpi_s_type = sp->type;
4577 info->sctpi_tag = asoc->c.my_vtag;
4578 info->sctpi_state = asoc->state;
4579 info->sctpi_rwnd = asoc->a_rwnd;
4580 info->sctpi_unackdata = asoc->unack_data;
4581 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4582 info->sctpi_instrms = asoc->stream.incnt;
4583 info->sctpi_outstrms = asoc->stream.outcnt;
4584 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4585 info->sctpi_inqueue++;
4586 list_for_each(pos, &asoc->outqueue.out_chunk_list)
4587 info->sctpi_outqueue++;
4588 info->sctpi_overall_error = asoc->overall_error_count;
4589 info->sctpi_max_burst = asoc->max_burst;
4590 info->sctpi_maxseg = asoc->frag_point;
4591 info->sctpi_peer_rwnd = asoc->peer.rwnd;
4592 info->sctpi_peer_tag = asoc->c.peer_vtag;
4594 mask = asoc->peer.ecn_capable << 1;
4595 mask = (mask | asoc->peer.ipv4_address) << 1;
4596 mask = (mask | asoc->peer.ipv6_address) << 1;
4597 mask = (mask | asoc->peer.hostname_address) << 1;
4598 mask = (mask | asoc->peer.asconf_capable) << 1;
4599 mask = (mask | asoc->peer.prsctp_capable) << 1;
4600 mask = (mask | asoc->peer.auth_capable);
4601 info->sctpi_peer_capable = mask;
4602 mask = asoc->peer.sack_needed << 1;
4603 mask = (mask | asoc->peer.sack_generation) << 1;
4604 mask = (mask | asoc->peer.zero_window_announced);
4605 info->sctpi_peer_sack = mask;
4607 info->sctpi_isacks = asoc->stats.isacks;
4608 info->sctpi_osacks = asoc->stats.osacks;
4609 info->sctpi_opackets = asoc->stats.opackets;
4610 info->sctpi_ipackets = asoc->stats.ipackets;
4611 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4612 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4613 info->sctpi_idupchunks = asoc->stats.idupchunks;
4614 info->sctpi_gapcnt = asoc->stats.gapcnt;
4615 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4616 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4617 info->sctpi_oodchunks = asoc->stats.oodchunks;
4618 info->sctpi_iodchunks = asoc->stats.iodchunks;
4619 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4620 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4622 prim = asoc->peer.primary_path;
4623 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4624 info->sctpi_p_state = prim->state;
4625 info->sctpi_p_cwnd = prim->cwnd;
4626 info->sctpi_p_srtt = prim->srtt;
4627 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4628 info->sctpi_p_hbinterval = prim->hbinterval;
4629 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4630 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4631 info->sctpi_p_ssthresh = prim->ssthresh;
4632 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4633 info->sctpi_p_flight_size = prim->flight_size;
4634 info->sctpi_p_error = prim->error_count;
4638 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4640 /* use callback to avoid exporting the core structure */
4641 void sctp_transport_walk_start(struct rhashtable_iter *iter)
4643 rhltable_walk_enter(&sctp_transport_hashtable, iter);
4645 rhashtable_walk_start(iter);
4648 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4650 rhashtable_walk_stop(iter);
4651 rhashtable_walk_exit(iter);
4654 struct sctp_transport *sctp_transport_get_next(struct net *net,
4655 struct rhashtable_iter *iter)
4657 struct sctp_transport *t;
4659 t = rhashtable_walk_next(iter);
4660 for (; t; t = rhashtable_walk_next(iter)) {
4662 if (PTR_ERR(t) == -EAGAIN)
4667 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4668 t->asoc->peer.primary_path == t)
4675 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4676 struct rhashtable_iter *iter,
4679 void *obj = SEQ_START_TOKEN;
4681 while (pos && (obj = sctp_transport_get_next(net, iter)) &&
4688 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
4692 struct sctp_ep_common *epb;
4693 struct sctp_hashbucket *head;
4695 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
4697 read_lock_bh(&head->lock);
4698 sctp_for_each_hentry(epb, &head->chain) {
4699 err = cb(sctp_ep(epb), p);
4703 read_unlock_bh(&head->lock);
4708 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
4710 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
4712 const union sctp_addr *laddr,
4713 const union sctp_addr *paddr, void *p)
4715 struct sctp_transport *transport;
4719 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4724 err = cb(transport, p);
4725 sctp_transport_put(transport);
4729 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
4731 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4732 int (*cb_done)(struct sctp_transport *, void *),
4733 struct net *net, int *pos, void *p) {
4734 struct rhashtable_iter hti;
4735 struct sctp_transport *tsp;
4740 sctp_transport_walk_start(&hti);
4742 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
4743 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
4744 if (!sctp_transport_hold(tsp))
4750 sctp_transport_put(tsp);
4752 sctp_transport_walk_stop(&hti);
4755 if (cb_done && !cb_done(tsp, p)) {
4757 sctp_transport_put(tsp);
4760 sctp_transport_put(tsp);
4765 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
4767 /* 7.2.1 Association Status (SCTP_STATUS)
4769 * Applications can retrieve current status information about an
4770 * association, including association state, peer receiver window size,
4771 * number of unacked data chunks, and number of data chunks pending
4772 * receipt. This information is read-only.
4774 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4775 char __user *optval,
4778 struct sctp_status status;
4779 struct sctp_association *asoc = NULL;
4780 struct sctp_transport *transport;
4781 sctp_assoc_t associd;
4784 if (len < sizeof(status)) {
4789 len = sizeof(status);
4790 if (copy_from_user(&status, optval, len)) {
4795 associd = status.sstat_assoc_id;
4796 asoc = sctp_id2assoc(sk, associd);
4802 transport = asoc->peer.primary_path;
4804 status.sstat_assoc_id = sctp_assoc2id(asoc);
4805 status.sstat_state = sctp_assoc_to_state(asoc);
4806 status.sstat_rwnd = asoc->peer.rwnd;
4807 status.sstat_unackdata = asoc->unack_data;
4809 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4810 status.sstat_instrms = asoc->stream.incnt;
4811 status.sstat_outstrms = asoc->stream.outcnt;
4812 status.sstat_fragmentation_point = asoc->frag_point;
4813 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4814 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4815 transport->af_specific->sockaddr_len);
4816 /* Map ipv4 address into v4-mapped-on-v6 address. */
4817 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4818 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4819 status.sstat_primary.spinfo_state = transport->state;
4820 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4821 status.sstat_primary.spinfo_srtt = transport->srtt;
4822 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4823 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4825 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4826 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4828 if (put_user(len, optlen)) {
4833 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4834 __func__, len, status.sstat_state, status.sstat_rwnd,
4835 status.sstat_assoc_id);
4837 if (copy_to_user(optval, &status, len)) {
4847 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4849 * Applications can retrieve information about a specific peer address
4850 * of an association, including its reachability state, congestion
4851 * window, and retransmission timer values. This information is
4854 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4855 char __user *optval,
4858 struct sctp_paddrinfo pinfo;
4859 struct sctp_transport *transport;
4862 if (len < sizeof(pinfo)) {
4867 len = sizeof(pinfo);
4868 if (copy_from_user(&pinfo, optval, len)) {
4873 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4874 pinfo.spinfo_assoc_id);
4878 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4879 pinfo.spinfo_state = transport->state;
4880 pinfo.spinfo_cwnd = transport->cwnd;
4881 pinfo.spinfo_srtt = transport->srtt;
4882 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4883 pinfo.spinfo_mtu = transport->pathmtu;
4885 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4886 pinfo.spinfo_state = SCTP_ACTIVE;
4888 if (put_user(len, optlen)) {
4893 if (copy_to_user(optval, &pinfo, len)) {
4902 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4904 * This option is a on/off flag. If enabled no SCTP message
4905 * fragmentation will be performed. Instead if a message being sent
4906 * exceeds the current PMTU size, the message will NOT be sent and
4907 * instead a error will be indicated to the user.
4909 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4910 char __user *optval, int __user *optlen)
4914 if (len < sizeof(int))
4918 val = (sctp_sk(sk)->disable_fragments == 1);
4919 if (put_user(len, optlen))
4921 if (copy_to_user(optval, &val, len))
4926 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4928 * This socket option is used to specify various notifications and
4929 * ancillary data the user wishes to receive.
4931 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4936 if (len > sizeof(struct sctp_event_subscribe))
4937 len = sizeof(struct sctp_event_subscribe);
4938 if (put_user(len, optlen))
4940 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4945 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4947 * This socket option is applicable to the UDP-style socket only. When
4948 * set it will cause associations that are idle for more than the
4949 * specified number of seconds to automatically close. An association
4950 * being idle is defined an association that has NOT sent or received
4951 * user data. The special value of '0' indicates that no automatic
4952 * close of any associations should be performed. The option expects an
4953 * integer defining the number of seconds of idle time before an
4954 * association is closed.
4956 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4958 /* Applicable to UDP-style socket only */
4959 if (sctp_style(sk, TCP))
4961 if (len < sizeof(int))
4964 if (put_user(len, optlen))
4966 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
4971 /* Helper routine to branch off an association to a new socket. */
4972 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4974 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4975 struct sctp_sock *sp = sctp_sk(sk);
4976 struct socket *sock;
4979 /* Do not peel off from one netns to another one. */
4980 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
4986 /* An association cannot be branched off from an already peeled-off
4987 * socket, nor is this supported for tcp style sockets.
4989 if (!sctp_style(sk, UDP))
4992 /* Create a new socket. */
4993 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4997 sctp_copy_sock(sock->sk, sk, asoc);
4999 /* Make peeled-off sockets more like 1-1 accepted sockets.
5000 * Set the daddr and initialize id to something more random
5002 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5004 /* Populate the fields of the newsk from the oldsk and migrate the
5005 * asoc to the newsk.
5007 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5013 EXPORT_SYMBOL(sctp_do_peeloff);
5015 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5016 struct file **newfile, unsigned flags)
5018 struct socket *newsock;
5021 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5025 /* Map the socket to an unused fd that can be returned to the user. */
5026 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5028 sock_release(newsock);
5032 *newfile = sock_alloc_file(newsock, 0, NULL);
5033 if (IS_ERR(*newfile)) {
5034 put_unused_fd(retval);
5035 retval = PTR_ERR(*newfile);
5040 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5043 peeloff->sd = retval;
5045 if (flags & SOCK_NONBLOCK)
5046 (*newfile)->f_flags |= O_NONBLOCK;
5051 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5053 sctp_peeloff_arg_t peeloff;
5054 struct file *newfile = NULL;
5057 if (len < sizeof(sctp_peeloff_arg_t))
5059 len = sizeof(sctp_peeloff_arg_t);
5060 if (copy_from_user(&peeloff, optval, len))
5063 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5067 /* Return the fd mapped to the new socket. */
5068 if (put_user(len, optlen)) {
5070 put_unused_fd(retval);
5074 if (copy_to_user(optval, &peeloff, len)) {
5076 put_unused_fd(retval);
5079 fd_install(retval, newfile);
5084 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5085 char __user *optval, int __user *optlen)
5087 sctp_peeloff_flags_arg_t peeloff;
5088 struct file *newfile = NULL;
5091 if (len < sizeof(sctp_peeloff_flags_arg_t))
5093 len = sizeof(sctp_peeloff_flags_arg_t);
5094 if (copy_from_user(&peeloff, optval, len))
5097 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5098 &newfile, peeloff.flags);
5102 /* Return the fd mapped to the new socket. */
5103 if (put_user(len, optlen)) {
5105 put_unused_fd(retval);
5109 if (copy_to_user(optval, &peeloff, len)) {
5111 put_unused_fd(retval);
5114 fd_install(retval, newfile);
5119 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5121 * Applications can enable or disable heartbeats for any peer address of
5122 * an association, modify an address's heartbeat interval, force a
5123 * heartbeat to be sent immediately, and adjust the address's maximum
5124 * number of retransmissions sent before an address is considered
5125 * unreachable. The following structure is used to access and modify an
5126 * address's parameters:
5128 * struct sctp_paddrparams {
5129 * sctp_assoc_t spp_assoc_id;
5130 * struct sockaddr_storage spp_address;
5131 * uint32_t spp_hbinterval;
5132 * uint16_t spp_pathmaxrxt;
5133 * uint32_t spp_pathmtu;
5134 * uint32_t spp_sackdelay;
5135 * uint32_t spp_flags;
5138 * spp_assoc_id - (one-to-many style socket) This is filled in the
5139 * application, and identifies the association for
5141 * spp_address - This specifies which address is of interest.
5142 * spp_hbinterval - This contains the value of the heartbeat interval,
5143 * in milliseconds. If a value of zero
5144 * is present in this field then no changes are to
5145 * be made to this parameter.
5146 * spp_pathmaxrxt - This contains the maximum number of
5147 * retransmissions before this address shall be
5148 * considered unreachable. If a value of zero
5149 * is present in this field then no changes are to
5150 * be made to this parameter.
5151 * spp_pathmtu - When Path MTU discovery is disabled the value
5152 * specified here will be the "fixed" path mtu.
5153 * Note that if the spp_address field is empty
5154 * then all associations on this address will
5155 * have this fixed path mtu set upon them.
5157 * spp_sackdelay - When delayed sack is enabled, this value specifies
5158 * the number of milliseconds that sacks will be delayed
5159 * for. This value will apply to all addresses of an
5160 * association if the spp_address field is empty. Note
5161 * also, that if delayed sack is enabled and this
5162 * value is set to 0, no change is made to the last
5163 * recorded delayed sack timer value.
5165 * spp_flags - These flags are used to control various features
5166 * on an association. The flag field may contain
5167 * zero or more of the following options.
5169 * SPP_HB_ENABLE - Enable heartbeats on the
5170 * specified address. Note that if the address
5171 * field is empty all addresses for the association
5172 * have heartbeats enabled upon them.
5174 * SPP_HB_DISABLE - Disable heartbeats on the
5175 * speicifed address. Note that if the address
5176 * field is empty all addresses for the association
5177 * will have their heartbeats disabled. Note also
5178 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5179 * mutually exclusive, only one of these two should
5180 * be specified. Enabling both fields will have
5181 * undetermined results.
5183 * SPP_HB_DEMAND - Request a user initiated heartbeat
5184 * to be made immediately.
5186 * SPP_PMTUD_ENABLE - This field will enable PMTU
5187 * discovery upon the specified address. Note that
5188 * if the address feild is empty then all addresses
5189 * on the association are effected.
5191 * SPP_PMTUD_DISABLE - This field will disable PMTU
5192 * discovery upon the specified address. Note that
5193 * if the address feild is empty then all addresses
5194 * on the association are effected. Not also that
5195 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5196 * exclusive. Enabling both will have undetermined
5199 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5200 * on delayed sack. The time specified in spp_sackdelay
5201 * is used to specify the sack delay for this address. Note
5202 * that if spp_address is empty then all addresses will
5203 * enable delayed sack and take on the sack delay
5204 * value specified in spp_sackdelay.
5205 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5206 * off delayed sack. If the spp_address field is blank then
5207 * delayed sack is disabled for the entire association. Note
5208 * also that this field is mutually exclusive to
5209 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5212 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5213 char __user *optval, int __user *optlen)
5215 struct sctp_paddrparams params;
5216 struct sctp_transport *trans = NULL;
5217 struct sctp_association *asoc = NULL;
5218 struct sctp_sock *sp = sctp_sk(sk);
5220 if (len < sizeof(struct sctp_paddrparams))
5222 len = sizeof(struct sctp_paddrparams);
5223 if (copy_from_user(¶ms, optval, len))
5226 /* If an address other than INADDR_ANY is specified, and
5227 * no transport is found, then the request is invalid.
5229 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5230 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5231 params.spp_assoc_id);
5233 pr_debug("%s: failed no transport\n", __func__);
5238 /* Get association, if assoc_id != 0 and the socket is a one
5239 * to many style socket, and an association was not found, then
5240 * the id was invalid.
5242 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5243 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5244 pr_debug("%s: failed no association\n", __func__);
5249 /* Fetch transport values. */
5250 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5251 params.spp_pathmtu = trans->pathmtu;
5252 params.spp_pathmaxrxt = trans->pathmaxrxt;
5253 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5255 /*draft-11 doesn't say what to return in spp_flags*/
5256 params.spp_flags = trans->param_flags;
5258 /* Fetch association values. */
5259 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5260 params.spp_pathmtu = asoc->pathmtu;
5261 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5262 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5264 /*draft-11 doesn't say what to return in spp_flags*/
5265 params.spp_flags = asoc->param_flags;
5267 /* Fetch socket values. */
5268 params.spp_hbinterval = sp->hbinterval;
5269 params.spp_pathmtu = sp->pathmtu;
5270 params.spp_sackdelay = sp->sackdelay;
5271 params.spp_pathmaxrxt = sp->pathmaxrxt;
5273 /*draft-11 doesn't say what to return in spp_flags*/
5274 params.spp_flags = sp->param_flags;
5277 if (copy_to_user(optval, ¶ms, len))
5280 if (put_user(len, optlen))
5287 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5289 * This option will effect the way delayed acks are performed. This
5290 * option allows you to get or set the delayed ack time, in
5291 * milliseconds. It also allows changing the delayed ack frequency.
5292 * Changing the frequency to 1 disables the delayed sack algorithm. If
5293 * the assoc_id is 0, then this sets or gets the endpoints default
5294 * values. If the assoc_id field is non-zero, then the set or get
5295 * effects the specified association for the one to many model (the
5296 * assoc_id field is ignored by the one to one model). Note that if
5297 * sack_delay or sack_freq are 0 when setting this option, then the
5298 * current values will remain unchanged.
5300 * struct sctp_sack_info {
5301 * sctp_assoc_t sack_assoc_id;
5302 * uint32_t sack_delay;
5303 * uint32_t sack_freq;
5306 * sack_assoc_id - This parameter, indicates which association the user
5307 * is performing an action upon. Note that if this field's value is
5308 * zero then the endpoints default value is changed (effecting future
5309 * associations only).
5311 * sack_delay - This parameter contains the number of milliseconds that
5312 * the user is requesting the delayed ACK timer be set to. Note that
5313 * this value is defined in the standard to be between 200 and 500
5316 * sack_freq - This parameter contains the number of packets that must
5317 * be received before a sack is sent without waiting for the delay
5318 * timer to expire. The default value for this is 2, setting this
5319 * value to 1 will disable the delayed sack algorithm.
5321 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5322 char __user *optval,
5325 struct sctp_sack_info params;
5326 struct sctp_association *asoc = NULL;
5327 struct sctp_sock *sp = sctp_sk(sk);
5329 if (len >= sizeof(struct sctp_sack_info)) {
5330 len = sizeof(struct sctp_sack_info);
5332 if (copy_from_user(¶ms, optval, len))
5334 } else if (len == sizeof(struct sctp_assoc_value)) {
5335 pr_warn_ratelimited(DEPRECATED
5337 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5338 "Use struct sctp_sack_info instead\n",
5339 current->comm, task_pid_nr(current));
5340 if (copy_from_user(¶ms, optval, len))
5345 /* Get association, if sack_assoc_id != 0 and the socket is a one
5346 * to many style socket, and an association was not found, then
5347 * the id was invalid.
5349 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5350 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5354 /* Fetch association values. */
5355 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5356 params.sack_delay = jiffies_to_msecs(
5358 params.sack_freq = asoc->sackfreq;
5361 params.sack_delay = 0;
5362 params.sack_freq = 1;
5365 /* Fetch socket values. */
5366 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5367 params.sack_delay = sp->sackdelay;
5368 params.sack_freq = sp->sackfreq;
5370 params.sack_delay = 0;
5371 params.sack_freq = 1;
5375 if (copy_to_user(optval, ¶ms, len))
5378 if (put_user(len, optlen))
5384 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5386 * Applications can specify protocol parameters for the default association
5387 * initialization. The option name argument to setsockopt() and getsockopt()
5390 * Setting initialization parameters is effective only on an unconnected
5391 * socket (for UDP-style sockets only future associations are effected
5392 * by the change). With TCP-style sockets, this option is inherited by
5393 * sockets derived from a listener socket.
5395 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5397 if (len < sizeof(struct sctp_initmsg))
5399 len = sizeof(struct sctp_initmsg);
5400 if (put_user(len, optlen))
5402 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5408 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5409 char __user *optval, int __user *optlen)
5411 struct sctp_association *asoc;
5413 struct sctp_getaddrs getaddrs;
5414 struct sctp_transport *from;
5416 union sctp_addr temp;
5417 struct sctp_sock *sp = sctp_sk(sk);
5422 if (len < sizeof(struct sctp_getaddrs))
5425 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5428 /* For UDP-style sockets, id specifies the association to query. */
5429 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5433 to = optval + offsetof(struct sctp_getaddrs, addrs);
5434 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5436 list_for_each_entry(from, &asoc->peer.transport_addr_list,
5438 memcpy(&temp, &from->ipaddr, sizeof(temp));
5439 addrlen = sctp_get_pf_specific(sk->sk_family)
5440 ->addr_to_user(sp, &temp);
5441 if (space_left < addrlen)
5443 if (copy_to_user(to, &temp, addrlen))
5447 space_left -= addrlen;
5450 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5452 bytes_copied = ((char __user *)to) - optval;
5453 if (put_user(bytes_copied, optlen))
5459 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5460 size_t space_left, int *bytes_copied)
5462 struct sctp_sockaddr_entry *addr;
5463 union sctp_addr temp;
5466 struct net *net = sock_net(sk);
5469 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5473 if ((PF_INET == sk->sk_family) &&
5474 (AF_INET6 == addr->a.sa.sa_family))
5476 if ((PF_INET6 == sk->sk_family) &&
5477 inet_v6_ipv6only(sk) &&
5478 (AF_INET == addr->a.sa.sa_family))
5480 memcpy(&temp, &addr->a, sizeof(temp));
5481 if (!temp.v4.sin_port)
5482 temp.v4.sin_port = htons(port);
5484 addrlen = sctp_get_pf_specific(sk->sk_family)
5485 ->addr_to_user(sctp_sk(sk), &temp);
5487 if (space_left < addrlen) {
5491 memcpy(to, &temp, addrlen);
5495 space_left -= addrlen;
5496 *bytes_copied += addrlen;
5504 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5505 char __user *optval, int __user *optlen)
5507 struct sctp_bind_addr *bp;
5508 struct sctp_association *asoc;
5510 struct sctp_getaddrs getaddrs;
5511 struct sctp_sockaddr_entry *addr;
5513 union sctp_addr temp;
5514 struct sctp_sock *sp = sctp_sk(sk);
5518 int bytes_copied = 0;
5522 if (len < sizeof(struct sctp_getaddrs))
5525 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5529 * For UDP-style sockets, id specifies the association to query.
5530 * If the id field is set to the value '0' then the locally bound
5531 * addresses are returned without regard to any particular
5534 if (0 == getaddrs.assoc_id) {
5535 bp = &sctp_sk(sk)->ep->base.bind_addr;
5537 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5540 bp = &asoc->base.bind_addr;
5543 to = optval + offsetof(struct sctp_getaddrs, addrs);
5544 space_left = len - offsetof(struct sctp_getaddrs, addrs);
5546 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5550 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5551 * addresses from the global local address list.
5553 if (sctp_list_single_entry(&bp->address_list)) {
5554 addr = list_entry(bp->address_list.next,
5555 struct sctp_sockaddr_entry, list);
5556 if (sctp_is_any(sk, &addr->a)) {
5557 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5558 space_left, &bytes_copied);
5568 /* Protection on the bound address list is not needed since
5569 * in the socket option context we hold a socket lock and
5570 * thus the bound address list can't change.
5572 list_for_each_entry(addr, &bp->address_list, list) {
5573 memcpy(&temp, &addr->a, sizeof(temp));
5574 addrlen = sctp_get_pf_specific(sk->sk_family)
5575 ->addr_to_user(sp, &temp);
5576 if (space_left < addrlen) {
5577 err = -ENOMEM; /*fixme: right error?*/
5580 memcpy(buf, &temp, addrlen);
5582 bytes_copied += addrlen;
5584 space_left -= addrlen;
5588 if (copy_to_user(to, addrs, bytes_copied)) {
5592 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5596 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5597 * but we can't change it anymore.
5599 if (put_user(bytes_copied, optlen))
5606 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
5608 * Requests that the local SCTP stack use the enclosed peer address as
5609 * the association primary. The enclosed address must be one of the
5610 * association peer's addresses.
5612 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5613 char __user *optval, int __user *optlen)
5615 struct sctp_prim prim;
5616 struct sctp_association *asoc;
5617 struct sctp_sock *sp = sctp_sk(sk);
5619 if (len < sizeof(struct sctp_prim))
5622 len = sizeof(struct sctp_prim);
5624 if (copy_from_user(&prim, optval, len))
5627 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5631 if (!asoc->peer.primary_path)
5634 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5635 asoc->peer.primary_path->af_specific->sockaddr_len);
5637 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5638 (union sctp_addr *)&prim.ssp_addr);
5640 if (put_user(len, optlen))
5642 if (copy_to_user(optval, &prim, len))
5649 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5651 * Requests that the local endpoint set the specified Adaptation Layer
5652 * Indication parameter for all future INIT and INIT-ACK exchanges.
5654 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5655 char __user *optval, int __user *optlen)
5657 struct sctp_setadaptation adaptation;
5659 if (len < sizeof(struct sctp_setadaptation))
5662 len = sizeof(struct sctp_setadaptation);
5664 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5666 if (put_user(len, optlen))
5668 if (copy_to_user(optval, &adaptation, len))
5676 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5678 * Applications that wish to use the sendto() system call may wish to
5679 * specify a default set of parameters that would normally be supplied
5680 * through the inclusion of ancillary data. This socket option allows
5681 * such an application to set the default sctp_sndrcvinfo structure.
5684 * The application that wishes to use this socket option simply passes
5685 * in to this call the sctp_sndrcvinfo structure defined in Section
5686 * 5.2.2) The input parameters accepted by this call include
5687 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5688 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
5689 * to this call if the caller is using the UDP model.
5691 * For getsockopt, it get the default sctp_sndrcvinfo structure.
5693 static int sctp_getsockopt_default_send_param(struct sock *sk,
5694 int len, char __user *optval,
5697 struct sctp_sock *sp = sctp_sk(sk);
5698 struct sctp_association *asoc;
5699 struct sctp_sndrcvinfo info;
5701 if (len < sizeof(info))
5706 if (copy_from_user(&info, optval, len))
5709 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5710 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5713 info.sinfo_stream = asoc->default_stream;
5714 info.sinfo_flags = asoc->default_flags;
5715 info.sinfo_ppid = asoc->default_ppid;
5716 info.sinfo_context = asoc->default_context;
5717 info.sinfo_timetolive = asoc->default_timetolive;
5719 info.sinfo_stream = sp->default_stream;
5720 info.sinfo_flags = sp->default_flags;
5721 info.sinfo_ppid = sp->default_ppid;
5722 info.sinfo_context = sp->default_context;
5723 info.sinfo_timetolive = sp->default_timetolive;
5726 if (put_user(len, optlen))
5728 if (copy_to_user(optval, &info, len))
5734 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5735 * (SCTP_DEFAULT_SNDINFO)
5737 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5738 char __user *optval,
5741 struct sctp_sock *sp = sctp_sk(sk);
5742 struct sctp_association *asoc;
5743 struct sctp_sndinfo info;
5745 if (len < sizeof(info))
5750 if (copy_from_user(&info, optval, len))
5753 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5754 if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5757 info.snd_sid = asoc->default_stream;
5758 info.snd_flags = asoc->default_flags;
5759 info.snd_ppid = asoc->default_ppid;
5760 info.snd_context = asoc->default_context;
5762 info.snd_sid = sp->default_stream;
5763 info.snd_flags = sp->default_flags;
5764 info.snd_ppid = sp->default_ppid;
5765 info.snd_context = sp->default_context;
5768 if (put_user(len, optlen))
5770 if (copy_to_user(optval, &info, len))
5778 * 7.1.5 SCTP_NODELAY
5780 * Turn on/off any Nagle-like algorithm. This means that packets are
5781 * generally sent as soon as possible and no unnecessary delays are
5782 * introduced, at the cost of more packets in the network. Expects an
5783 * integer boolean flag.
5786 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5787 char __user *optval, int __user *optlen)
5791 if (len < sizeof(int))
5795 val = (sctp_sk(sk)->nodelay == 1);
5796 if (put_user(len, optlen))
5798 if (copy_to_user(optval, &val, len))
5805 * 7.1.1 SCTP_RTOINFO
5807 * The protocol parameters used to initialize and bound retransmission
5808 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5809 * and modify these parameters.
5810 * All parameters are time values, in milliseconds. A value of 0, when
5811 * modifying the parameters, indicates that the current value should not
5815 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5816 char __user *optval,
5817 int __user *optlen) {
5818 struct sctp_rtoinfo rtoinfo;
5819 struct sctp_association *asoc;
5821 if (len < sizeof (struct sctp_rtoinfo))
5824 len = sizeof(struct sctp_rtoinfo);
5826 if (copy_from_user(&rtoinfo, optval, len))
5829 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5831 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5834 /* Values corresponding to the specific association. */
5836 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5837 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5838 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5840 /* Values corresponding to the endpoint. */
5841 struct sctp_sock *sp = sctp_sk(sk);
5843 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5844 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5845 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5848 if (put_user(len, optlen))
5851 if (copy_to_user(optval, &rtoinfo, len))
5859 * 7.1.2 SCTP_ASSOCINFO
5861 * This option is used to tune the maximum retransmission attempts
5862 * of the association.
5863 * Returns an error if the new association retransmission value is
5864 * greater than the sum of the retransmission value of the peer.
5865 * See [SCTP] for more information.
5868 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5869 char __user *optval,
5873 struct sctp_assocparams assocparams;
5874 struct sctp_association *asoc;
5875 struct list_head *pos;
5878 if (len < sizeof (struct sctp_assocparams))
5881 len = sizeof(struct sctp_assocparams);
5883 if (copy_from_user(&assocparams, optval, len))
5886 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5888 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5891 /* Values correspoinding to the specific association */
5893 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5894 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5895 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5896 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5898 list_for_each(pos, &asoc->peer.transport_addr_list) {
5902 assocparams.sasoc_number_peer_destinations = cnt;
5904 /* Values corresponding to the endpoint */
5905 struct sctp_sock *sp = sctp_sk(sk);
5907 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5908 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5909 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5910 assocparams.sasoc_cookie_life =
5911 sp->assocparams.sasoc_cookie_life;
5912 assocparams.sasoc_number_peer_destinations =
5914 sasoc_number_peer_destinations;
5917 if (put_user(len, optlen))
5920 if (copy_to_user(optval, &assocparams, len))
5927 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5929 * This socket option is a boolean flag which turns on or off mapped V4
5930 * addresses. If this option is turned on and the socket is type
5931 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5932 * If this option is turned off, then no mapping will be done of V4
5933 * addresses and a user will receive both PF_INET6 and PF_INET type
5934 * addresses on the socket.
5936 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5937 char __user *optval, int __user *optlen)
5940 struct sctp_sock *sp = sctp_sk(sk);
5942 if (len < sizeof(int))
5947 if (put_user(len, optlen))
5949 if (copy_to_user(optval, &val, len))
5956 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5957 * (chapter and verse is quoted at sctp_setsockopt_context())
5959 static int sctp_getsockopt_context(struct sock *sk, int len,
5960 char __user *optval, int __user *optlen)
5962 struct sctp_assoc_value params;
5963 struct sctp_sock *sp;
5964 struct sctp_association *asoc;
5966 if (len < sizeof(struct sctp_assoc_value))
5969 len = sizeof(struct sctp_assoc_value);
5971 if (copy_from_user(¶ms, optval, len))
5976 if (params.assoc_id != 0) {
5977 asoc = sctp_id2assoc(sk, params.assoc_id);
5980 params.assoc_value = asoc->default_rcv_context;
5982 params.assoc_value = sp->default_rcv_context;
5985 if (put_user(len, optlen))
5987 if (copy_to_user(optval, ¶ms, len))
5994 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5995 * This option will get or set the maximum size to put in any outgoing
5996 * SCTP DATA chunk. If a message is larger than this size it will be
5997 * fragmented by SCTP into the specified size. Note that the underlying
5998 * SCTP implementation may fragment into smaller sized chunks when the
5999 * PMTU of the underlying association is smaller than the value set by
6000 * the user. The default value for this option is '0' which indicates
6001 * the user is NOT limiting fragmentation and only the PMTU will effect
6002 * SCTP's choice of DATA chunk size. Note also that values set larger
6003 * than the maximum size of an IP datagram will effectively let SCTP
6004 * control fragmentation (i.e. the same as setting this option to 0).
6006 * The following structure is used to access and modify this parameter:
6008 * struct sctp_assoc_value {
6009 * sctp_assoc_t assoc_id;
6010 * uint32_t assoc_value;
6013 * assoc_id: This parameter is ignored for one-to-one style sockets.
6014 * For one-to-many style sockets this parameter indicates which
6015 * association the user is performing an action upon. Note that if
6016 * this field's value is zero then the endpoints default value is
6017 * changed (effecting future associations only).
6018 * assoc_value: This parameter specifies the maximum size in bytes.
6020 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6021 char __user *optval, int __user *optlen)
6023 struct sctp_assoc_value params;
6024 struct sctp_association *asoc;
6026 if (len == sizeof(int)) {
6027 pr_warn_ratelimited(DEPRECATED
6029 "Use of int in maxseg socket option.\n"
6030 "Use struct sctp_assoc_value instead\n",
6031 current->comm, task_pid_nr(current));
6032 params.assoc_id = 0;
6033 } else if (len >= sizeof(struct sctp_assoc_value)) {
6034 len = sizeof(struct sctp_assoc_value);
6035 if (copy_from_user(¶ms, optval, len))
6040 asoc = sctp_id2assoc(sk, params.assoc_id);
6041 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
6045 params.assoc_value = asoc->frag_point;
6047 params.assoc_value = sctp_sk(sk)->user_frag;
6049 if (put_user(len, optlen))
6051 if (len == sizeof(int)) {
6052 if (copy_to_user(optval, ¶ms.assoc_value, len))
6055 if (copy_to_user(optval, ¶ms, len))
6063 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6064 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6066 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6067 char __user *optval, int __user *optlen)
6071 if (len < sizeof(int))
6076 val = sctp_sk(sk)->frag_interleave;
6077 if (put_user(len, optlen))
6079 if (copy_to_user(optval, &val, len))
6086 * 7.1.25. Set or Get the sctp partial delivery point
6087 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6089 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6090 char __user *optval,
6095 if (len < sizeof(u32))
6100 val = sctp_sk(sk)->pd_point;
6101 if (put_user(len, optlen))
6103 if (copy_to_user(optval, &val, len))
6110 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6111 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6113 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6114 char __user *optval,
6117 struct sctp_assoc_value params;
6118 struct sctp_sock *sp;
6119 struct sctp_association *asoc;
6121 if (len == sizeof(int)) {
6122 pr_warn_ratelimited(DEPRECATED
6124 "Use of int in max_burst socket option.\n"
6125 "Use struct sctp_assoc_value instead\n",
6126 current->comm, task_pid_nr(current));
6127 params.assoc_id = 0;
6128 } else if (len >= sizeof(struct sctp_assoc_value)) {
6129 len = sizeof(struct sctp_assoc_value);
6130 if (copy_from_user(¶ms, optval, len))
6137 if (params.assoc_id != 0) {
6138 asoc = sctp_id2assoc(sk, params.assoc_id);
6141 params.assoc_value = asoc->max_burst;
6143 params.assoc_value = sp->max_burst;
6145 if (len == sizeof(int)) {
6146 if (copy_to_user(optval, ¶ms.assoc_value, len))
6149 if (copy_to_user(optval, ¶ms, len))
6157 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6158 char __user *optval, int __user *optlen)
6160 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6161 struct sctp_hmacalgo __user *p = (void __user *)optval;
6162 struct sctp_hmac_algo_param *hmacs;
6167 if (!ep->auth_enable)
6170 hmacs = ep->auth_hmacs_list;
6171 data_len = ntohs(hmacs->param_hdr.length) -
6172 sizeof(struct sctp_paramhdr);
6174 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6177 len = sizeof(struct sctp_hmacalgo) + data_len;
6178 num_idents = data_len / sizeof(u16);
6180 if (put_user(len, optlen))
6182 if (put_user(num_idents, &p->shmac_num_idents))
6184 for (i = 0; i < num_idents; i++) {
6185 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6187 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6193 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6194 char __user *optval, int __user *optlen)
6196 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6197 struct sctp_authkeyid val;
6198 struct sctp_association *asoc;
6200 if (!ep->auth_enable)
6203 if (len < sizeof(struct sctp_authkeyid))
6206 len = sizeof(struct sctp_authkeyid);
6207 if (copy_from_user(&val, optval, len))
6210 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6211 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6215 val.scact_keynumber = asoc->active_key_id;
6217 val.scact_keynumber = ep->active_key_id;
6219 if (put_user(len, optlen))
6221 if (copy_to_user(optval, &val, len))
6227 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6228 char __user *optval, int __user *optlen)
6230 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6231 struct sctp_authchunks __user *p = (void __user *)optval;
6232 struct sctp_authchunks val;
6233 struct sctp_association *asoc;
6234 struct sctp_chunks_param *ch;
6238 if (!ep->auth_enable)
6241 if (len < sizeof(struct sctp_authchunks))
6244 if (copy_from_user(&val, optval, sizeof(val)))
6247 to = p->gauth_chunks;
6248 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6252 ch = asoc->peer.peer_chunks;
6256 /* See if the user provided enough room for all the data */
6257 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6258 if (len < num_chunks)
6261 if (copy_to_user(to, ch->chunks, num_chunks))
6264 len = sizeof(struct sctp_authchunks) + num_chunks;
6265 if (put_user(len, optlen))
6267 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6272 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6273 char __user *optval, int __user *optlen)
6275 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6276 struct sctp_authchunks __user *p = (void __user *)optval;
6277 struct sctp_authchunks val;
6278 struct sctp_association *asoc;
6279 struct sctp_chunks_param *ch;
6283 if (!ep->auth_enable)
6286 if (len < sizeof(struct sctp_authchunks))
6289 if (copy_from_user(&val, optval, sizeof(val)))
6292 to = p->gauth_chunks;
6293 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6294 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
6298 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6300 ch = ep->auth_chunk_list;
6305 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6306 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6309 if (copy_to_user(to, ch->chunks, num_chunks))
6312 len = sizeof(struct sctp_authchunks) + num_chunks;
6313 if (put_user(len, optlen))
6315 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6322 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6323 * This option gets the current number of associations that are attached
6324 * to a one-to-many style socket. The option value is an uint32_t.
6326 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6327 char __user *optval, int __user *optlen)
6329 struct sctp_sock *sp = sctp_sk(sk);
6330 struct sctp_association *asoc;
6333 if (sctp_style(sk, TCP))
6336 if (len < sizeof(u32))
6341 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6345 if (put_user(len, optlen))
6347 if (copy_to_user(optval, &val, len))
6354 * 8.1.23 SCTP_AUTO_ASCONF
6355 * See the corresponding setsockopt entry as description
6357 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6358 char __user *optval, int __user *optlen)
6362 if (len < sizeof(int))
6366 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6368 if (put_user(len, optlen))
6370 if (copy_to_user(optval, &val, len))
6376 * 8.2.6. Get the Current Identifiers of Associations
6377 * (SCTP_GET_ASSOC_ID_LIST)
6379 * This option gets the current list of SCTP association identifiers of
6380 * the SCTP associations handled by a one-to-many style socket.
6382 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6383 char __user *optval, int __user *optlen)
6385 struct sctp_sock *sp = sctp_sk(sk);
6386 struct sctp_association *asoc;
6387 struct sctp_assoc_ids *ids;
6390 if (sctp_style(sk, TCP))
6393 if (len < sizeof(struct sctp_assoc_ids))
6396 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6400 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6403 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6405 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6409 ids->gaids_number_of_ids = num;
6411 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6412 ids->gaids_assoc_id[num++] = asoc->assoc_id;
6415 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
6425 * SCTP_PEER_ADDR_THLDS
6427 * This option allows us to fetch the partially failed threshold for one or all
6428 * transports in an association. See Section 6.1 of:
6429 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
6431 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
6432 char __user *optval,
6436 struct sctp_paddrthlds val;
6437 struct sctp_transport *trans;
6438 struct sctp_association *asoc;
6440 if (len < sizeof(struct sctp_paddrthlds))
6442 len = sizeof(struct sctp_paddrthlds);
6443 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
6446 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
6447 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
6451 val.spt_pathpfthld = asoc->pf_retrans;
6452 val.spt_pathmaxrxt = asoc->pathmaxrxt;
6454 trans = sctp_addr_id2transport(sk, &val.spt_address,
6459 val.spt_pathmaxrxt = trans->pathmaxrxt;
6460 val.spt_pathpfthld = trans->pf_retrans;
6463 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
6470 * SCTP_GET_ASSOC_STATS
6472 * This option retrieves local per endpoint statistics. It is modeled
6473 * after OpenSolaris' implementation
6475 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
6476 char __user *optval,
6479 struct sctp_assoc_stats sas;
6480 struct sctp_association *asoc = NULL;
6482 /* User must provide at least the assoc id */
6483 if (len < sizeof(sctp_assoc_t))
6486 /* Allow the struct to grow and fill in as much as possible */
6487 len = min_t(size_t, len, sizeof(sas));
6489 if (copy_from_user(&sas, optval, len))
6492 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
6496 sas.sas_rtxchunks = asoc->stats.rtxchunks;
6497 sas.sas_gapcnt = asoc->stats.gapcnt;
6498 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
6499 sas.sas_osacks = asoc->stats.osacks;
6500 sas.sas_isacks = asoc->stats.isacks;
6501 sas.sas_octrlchunks = asoc->stats.octrlchunks;
6502 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
6503 sas.sas_oodchunks = asoc->stats.oodchunks;
6504 sas.sas_iodchunks = asoc->stats.iodchunks;
6505 sas.sas_ouodchunks = asoc->stats.ouodchunks;
6506 sas.sas_iuodchunks = asoc->stats.iuodchunks;
6507 sas.sas_idupchunks = asoc->stats.idupchunks;
6508 sas.sas_opackets = asoc->stats.opackets;
6509 sas.sas_ipackets = asoc->stats.ipackets;
6511 /* New high max rto observed, will return 0 if not a single
6512 * RTO update took place. obs_rto_ipaddr will be bogus
6515 sas.sas_maxrto = asoc->stats.max_obs_rto;
6516 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
6517 sizeof(struct sockaddr_storage));
6519 /* Mark beginning of a new observation period */
6520 asoc->stats.max_obs_rto = asoc->rto_min;
6522 if (put_user(len, optlen))
6525 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6527 if (copy_to_user(optval, &sas, len))
6533 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
6534 char __user *optval,
6539 if (len < sizeof(int))
6543 if (sctp_sk(sk)->recvrcvinfo)
6545 if (put_user(len, optlen))
6547 if (copy_to_user(optval, &val, len))
6553 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
6554 char __user *optval,
6559 if (len < sizeof(int))
6563 if (sctp_sk(sk)->recvnxtinfo)
6565 if (put_user(len, optlen))
6567 if (copy_to_user(optval, &val, len))
6573 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
6574 char __user *optval,
6577 struct sctp_assoc_value params;
6578 struct sctp_association *asoc;
6579 int retval = -EFAULT;
6581 if (len < sizeof(params)) {
6586 len = sizeof(params);
6587 if (copy_from_user(¶ms, optval, len))
6590 asoc = sctp_id2assoc(sk, params.assoc_id);
6592 params.assoc_value = asoc->prsctp_enable;
6593 } else if (!params.assoc_id) {
6594 struct sctp_sock *sp = sctp_sk(sk);
6596 params.assoc_value = sp->ep->prsctp_enable;
6602 if (put_user(len, optlen))
6605 if (copy_to_user(optval, ¶ms, len))
6614 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
6615 char __user *optval,
6618 struct sctp_default_prinfo info;
6619 struct sctp_association *asoc;
6620 int retval = -EFAULT;
6622 if (len < sizeof(info)) {
6628 if (copy_from_user(&info, optval, len))
6631 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
6633 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
6634 info.pr_value = asoc->default_timetolive;
6635 } else if (!info.pr_assoc_id) {
6636 struct sctp_sock *sp = sctp_sk(sk);
6638 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
6639 info.pr_value = sp->default_timetolive;
6645 if (put_user(len, optlen))
6648 if (copy_to_user(optval, &info, len))
6657 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
6658 char __user *optval,
6661 struct sctp_prstatus params;
6662 struct sctp_association *asoc;
6664 int retval = -EINVAL;
6666 if (len < sizeof(params))
6669 len = sizeof(params);
6670 if (copy_from_user(¶ms, optval, len)) {
6675 policy = params.sprstat_policy;
6676 if (policy & ~SCTP_PR_SCTP_MASK)
6679 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6683 if (policy == SCTP_PR_SCTP_NONE) {
6684 params.sprstat_abandoned_unsent = 0;
6685 params.sprstat_abandoned_sent = 0;
6686 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6687 params.sprstat_abandoned_unsent +=
6688 asoc->abandoned_unsent[policy];
6689 params.sprstat_abandoned_sent +=
6690 asoc->abandoned_sent[policy];
6693 params.sprstat_abandoned_unsent =
6694 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6695 params.sprstat_abandoned_sent =
6696 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
6699 if (put_user(len, optlen)) {
6704 if (copy_to_user(optval, ¶ms, len)) {
6715 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
6716 char __user *optval,
6719 struct sctp_stream_out_ext *streamoute;
6720 struct sctp_association *asoc;
6721 struct sctp_prstatus params;
6722 int retval = -EINVAL;
6725 if (len < sizeof(params))
6728 len = sizeof(params);
6729 if (copy_from_user(¶ms, optval, len)) {
6734 policy = params.sprstat_policy;
6735 if (policy & ~SCTP_PR_SCTP_MASK)
6738 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6739 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6742 streamoute = asoc->stream.out[params.sprstat_sid].ext;
6744 /* Not allocated yet, means all stats are 0 */
6745 params.sprstat_abandoned_unsent = 0;
6746 params.sprstat_abandoned_sent = 0;
6751 if (policy == SCTP_PR_SCTP_NONE) {
6752 params.sprstat_abandoned_unsent = 0;
6753 params.sprstat_abandoned_sent = 0;
6754 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
6755 params.sprstat_abandoned_unsent +=
6756 streamoute->abandoned_unsent[policy];
6757 params.sprstat_abandoned_sent +=
6758 streamoute->abandoned_sent[policy];
6761 params.sprstat_abandoned_unsent =
6762 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6763 params.sprstat_abandoned_sent =
6764 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
6767 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
6778 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
6779 char __user *optval,
6782 struct sctp_assoc_value params;
6783 struct sctp_association *asoc;
6784 int retval = -EFAULT;
6786 if (len < sizeof(params)) {
6791 len = sizeof(params);
6792 if (copy_from_user(¶ms, optval, len))
6795 asoc = sctp_id2assoc(sk, params.assoc_id);
6797 params.assoc_value = asoc->reconf_enable;
6798 } else if (!params.assoc_id) {
6799 struct sctp_sock *sp = sctp_sk(sk);
6801 params.assoc_value = sp->ep->reconf_enable;
6807 if (put_user(len, optlen))
6810 if (copy_to_user(optval, ¶ms, len))
6819 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
6820 char __user *optval,
6823 struct sctp_assoc_value params;
6824 struct sctp_association *asoc;
6825 int retval = -EFAULT;
6827 if (len < sizeof(params)) {
6832 len = sizeof(params);
6833 if (copy_from_user(¶ms, optval, len))
6836 asoc = sctp_id2assoc(sk, params.assoc_id);
6838 params.assoc_value = asoc->strreset_enable;
6839 } else if (!params.assoc_id) {
6840 struct sctp_sock *sp = sctp_sk(sk);
6842 params.assoc_value = sp->ep->strreset_enable;
6848 if (put_user(len, optlen))
6851 if (copy_to_user(optval, ¶ms, len))
6860 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
6861 char __user *optval,
6864 struct sctp_assoc_value params;
6865 struct sctp_association *asoc;
6866 int retval = -EFAULT;
6868 if (len < sizeof(params)) {
6873 len = sizeof(params);
6874 if (copy_from_user(¶ms, optval, len))
6877 asoc = sctp_id2assoc(sk, params.assoc_id);
6883 params.assoc_value = sctp_sched_get_sched(asoc);
6885 if (put_user(len, optlen))
6888 if (copy_to_user(optval, ¶ms, len))
6897 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
6898 char __user *optval,
6901 struct sctp_stream_value params;
6902 struct sctp_association *asoc;
6903 int retval = -EFAULT;
6905 if (len < sizeof(params)) {
6910 len = sizeof(params);
6911 if (copy_from_user(¶ms, optval, len))
6914 asoc = sctp_id2assoc(sk, params.assoc_id);
6920 retval = sctp_sched_get_value(asoc, params.stream_id,
6921 ¶ms.stream_value);
6925 if (put_user(len, optlen)) {
6930 if (copy_to_user(optval, ¶ms, len)) {
6939 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
6940 char __user *optval,
6943 struct sctp_assoc_value params;
6944 struct sctp_association *asoc;
6945 int retval = -EFAULT;
6947 if (len < sizeof(params)) {
6952 len = sizeof(params);
6953 if (copy_from_user(¶ms, optval, len))
6956 asoc = sctp_id2assoc(sk, params.assoc_id);
6958 params.assoc_value = asoc->intl_enable;
6959 } else if (!params.assoc_id) {
6960 struct sctp_sock *sp = sctp_sk(sk);
6962 params.assoc_value = sp->strm_interleave;
6968 if (put_user(len, optlen))
6971 if (copy_to_user(optval, ¶ms, len))
6980 static int sctp_getsockopt(struct sock *sk, int level, int optname,
6981 char __user *optval, int __user *optlen)
6986 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
6988 /* I can hardly begin to describe how wrong this is. This is
6989 * so broken as to be worse than useless. The API draft
6990 * REALLY is NOT helpful here... I am not convinced that the
6991 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
6992 * are at all well-founded.
6994 if (level != SOL_SCTP) {
6995 struct sctp_af *af = sctp_sk(sk)->pf->af;
6997 retval = af->getsockopt(sk, level, optname, optval, optlen);
7001 if (get_user(len, optlen))
7011 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7013 case SCTP_DISABLE_FRAGMENTS:
7014 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7018 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7020 case SCTP_AUTOCLOSE:
7021 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7023 case SCTP_SOCKOPT_PEELOFF:
7024 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7026 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7027 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7029 case SCTP_PEER_ADDR_PARAMS:
7030 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7033 case SCTP_DELAYED_SACK:
7034 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7038 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7040 case SCTP_GET_PEER_ADDRS:
7041 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7044 case SCTP_GET_LOCAL_ADDRS:
7045 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7048 case SCTP_SOCKOPT_CONNECTX3:
7049 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7051 case SCTP_DEFAULT_SEND_PARAM:
7052 retval = sctp_getsockopt_default_send_param(sk, len,
7055 case SCTP_DEFAULT_SNDINFO:
7056 retval = sctp_getsockopt_default_sndinfo(sk, len,
7059 case SCTP_PRIMARY_ADDR:
7060 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7063 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7066 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7068 case SCTP_ASSOCINFO:
7069 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7071 case SCTP_I_WANT_MAPPED_V4_ADDR:
7072 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7075 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7077 case SCTP_GET_PEER_ADDR_INFO:
7078 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7081 case SCTP_ADAPTATION_LAYER:
7082 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7086 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7088 case SCTP_FRAGMENT_INTERLEAVE:
7089 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7092 case SCTP_PARTIAL_DELIVERY_POINT:
7093 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7096 case SCTP_MAX_BURST:
7097 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7100 case SCTP_AUTH_CHUNK:
7101 case SCTP_AUTH_DELETE_KEY:
7102 retval = -EOPNOTSUPP;
7104 case SCTP_HMAC_IDENT:
7105 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7107 case SCTP_AUTH_ACTIVE_KEY:
7108 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7110 case SCTP_PEER_AUTH_CHUNKS:
7111 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7114 case SCTP_LOCAL_AUTH_CHUNKS:
7115 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7118 case SCTP_GET_ASSOC_NUMBER:
7119 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7121 case SCTP_GET_ASSOC_ID_LIST:
7122 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7124 case SCTP_AUTO_ASCONF:
7125 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7127 case SCTP_PEER_ADDR_THLDS:
7128 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7130 case SCTP_GET_ASSOC_STATS:
7131 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7133 case SCTP_RECVRCVINFO:
7134 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7136 case SCTP_RECVNXTINFO:
7137 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7139 case SCTP_PR_SUPPORTED:
7140 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7142 case SCTP_DEFAULT_PRINFO:
7143 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7146 case SCTP_PR_ASSOC_STATUS:
7147 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7150 case SCTP_PR_STREAM_STATUS:
7151 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7154 case SCTP_RECONFIG_SUPPORTED:
7155 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7158 case SCTP_ENABLE_STREAM_RESET:
7159 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7162 case SCTP_STREAM_SCHEDULER:
7163 retval = sctp_getsockopt_scheduler(sk, len, optval,
7166 case SCTP_STREAM_SCHEDULER_VALUE:
7167 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7170 case SCTP_INTERLEAVING_SUPPORTED:
7171 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7175 retval = -ENOPROTOOPT;
7183 static int sctp_hash(struct sock *sk)
7189 static void sctp_unhash(struct sock *sk)
7194 /* Check if port is acceptable. Possibly find first available port.
7196 * The port hash table (contained in the 'global' SCTP protocol storage
7197 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
7198 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
7199 * list (the list number is the port number hashed out, so as you
7200 * would expect from a hash function, all the ports in a given list have
7201 * such a number that hashes out to the same list number; you were
7202 * expecting that, right?); so each list has a set of ports, with a
7203 * link to the socket (struct sock) that uses it, the port number and
7204 * a fastreuse flag (FIXME: NPI ipg).
7206 static struct sctp_bind_bucket *sctp_bucket_create(
7207 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
7209 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
7211 struct sctp_bind_hashbucket *head; /* hash list */
7212 struct sctp_bind_bucket *pp;
7213 unsigned short snum;
7216 snum = ntohs(addr->v4.sin_port);
7218 pr_debug("%s: begins, snum:%d\n", __func__, snum);
7223 /* Search for an available port. */
7224 int low, high, remaining, index;
7226 struct net *net = sock_net(sk);
7228 inet_get_local_port_range(net, &low, &high);
7229 remaining = (high - low) + 1;
7230 rover = prandom_u32() % remaining + low;
7234 if ((rover < low) || (rover > high))
7236 if (inet_is_local_reserved_port(net, rover))
7238 index = sctp_phashfn(sock_net(sk), rover);
7239 head = &sctp_port_hashtable[index];
7240 spin_lock(&head->lock);
7241 sctp_for_each_hentry(pp, &head->chain)
7242 if ((pp->port == rover) &&
7243 net_eq(sock_net(sk), pp->net))
7247 spin_unlock(&head->lock);
7248 } while (--remaining > 0);
7250 /* Exhausted local port range during search? */
7255 /* OK, here is the one we will use. HEAD (the port
7256 * hash table list entry) is non-NULL and we hold it's
7261 /* We are given an specific port number; we verify
7262 * that it is not being used. If it is used, we will
7263 * exahust the search in the hash list corresponding
7264 * to the port number (snum) - we detect that with the
7265 * port iterator, pp being NULL.
7267 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7268 spin_lock(&head->lock);
7269 sctp_for_each_hentry(pp, &head->chain) {
7270 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
7277 if (!hlist_empty(&pp->owner)) {
7278 /* We had a port hash table hit - there is an
7279 * available port (pp != NULL) and it is being
7280 * used by other socket (pp->owner not empty); that other
7281 * socket is going to be sk2.
7283 int reuse = sk->sk_reuse;
7286 pr_debug("%s: found a possible match\n", __func__);
7288 if (pp->fastreuse && sk->sk_reuse &&
7289 sk->sk_state != SCTP_SS_LISTENING)
7292 /* Run through the list of sockets bound to the port
7293 * (pp->port) [via the pointers bind_next and
7294 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
7295 * we get the endpoint they describe and run through
7296 * the endpoint's list of IP (v4 or v6) addresses,
7297 * comparing each of the addresses with the address of
7298 * the socket sk. If we find a match, then that means
7299 * that this port/socket (sk) combination are already
7302 sk_for_each_bound(sk2, &pp->owner) {
7303 struct sctp_endpoint *ep2;
7304 ep2 = sctp_sk(sk2)->ep;
7307 (reuse && sk2->sk_reuse &&
7308 sk2->sk_state != SCTP_SS_LISTENING))
7311 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
7312 sctp_sk(sk2), sctp_sk(sk))) {
7318 pr_debug("%s: found a match\n", __func__);
7321 /* If there was a hash table miss, create a new port. */
7323 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
7326 /* In either case (hit or miss), make sure fastreuse is 1 only
7327 * if sk->sk_reuse is too (that is, if the caller requested
7328 * SO_REUSEADDR on this socket -sk-).
7330 if (hlist_empty(&pp->owner)) {
7331 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
7335 } else if (pp->fastreuse &&
7336 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
7339 /* We are set, so fill up all the data in the hash table
7340 * entry, tie the socket list information with the rest of the
7341 * sockets FIXME: Blurry, NPI (ipg).
7344 if (!sctp_sk(sk)->bind_hash) {
7345 inet_sk(sk)->inet_num = snum;
7346 sk_add_bind_node(sk, &pp->owner);
7347 sctp_sk(sk)->bind_hash = pp;
7352 spin_unlock(&head->lock);
7359 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
7360 * port is requested.
7362 static int sctp_get_port(struct sock *sk, unsigned short snum)
7364 union sctp_addr addr;
7365 struct sctp_af *af = sctp_sk(sk)->pf->af;
7367 /* Set up a dummy address struct from the sk. */
7368 af->from_sk(&addr, sk);
7369 addr.v4.sin_port = htons(snum);
7371 /* Note: sk->sk_num gets filled in if ephemeral port request. */
7372 return !!sctp_get_port_local(sk, &addr);
7376 * Move a socket to LISTENING state.
7378 static int sctp_listen_start(struct sock *sk, int backlog)
7380 struct sctp_sock *sp = sctp_sk(sk);
7381 struct sctp_endpoint *ep = sp->ep;
7382 struct crypto_shash *tfm = NULL;
7385 /* Allocate HMAC for generating cookie. */
7386 if (!sp->hmac && sp->sctp_hmac_alg) {
7387 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
7388 tfm = crypto_alloc_shash(alg, 0, 0);
7390 net_info_ratelimited("failed to load transform for %s: %ld\n",
7391 sp->sctp_hmac_alg, PTR_ERR(tfm));
7394 sctp_sk(sk)->hmac = tfm;
7398 * If a bind() or sctp_bindx() is not called prior to a listen()
7399 * call that allows new associations to be accepted, the system
7400 * picks an ephemeral port and will choose an address set equivalent
7401 * to binding with a wildcard address.
7403 * This is not currently spelled out in the SCTP sockets
7404 * extensions draft, but follows the practice as seen in TCP
7408 inet_sk_set_state(sk, SCTP_SS_LISTENING);
7409 if (!ep->base.bind_addr.port) {
7410 if (sctp_autobind(sk))
7413 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7414 inet_sk_set_state(sk, SCTP_SS_CLOSED);
7419 sk->sk_max_ack_backlog = backlog;
7420 sctp_hash_endpoint(ep);
7425 * 4.1.3 / 5.1.3 listen()
7427 * By default, new associations are not accepted for UDP style sockets.
7428 * An application uses listen() to mark a socket as being able to
7429 * accept new associations.
7431 * On TCP style sockets, applications use listen() to ready the SCTP
7432 * endpoint for accepting inbound associations.
7434 * On both types of endpoints a backlog of '0' disables listening.
7436 * Move a socket to LISTENING state.
7438 int sctp_inet_listen(struct socket *sock, int backlog)
7440 struct sock *sk = sock->sk;
7441 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7444 if (unlikely(backlog < 0))
7449 /* Peeled-off sockets are not allowed to listen(). */
7450 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
7453 if (sock->state != SS_UNCONNECTED)
7456 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
7459 /* If backlog is zero, disable listening. */
7461 if (sctp_sstate(sk, CLOSED))
7465 sctp_unhash_endpoint(ep);
7466 sk->sk_state = SCTP_SS_CLOSED;
7468 sctp_sk(sk)->bind_hash->fastreuse = 1;
7472 /* If we are already listening, just update the backlog */
7473 if (sctp_sstate(sk, LISTENING))
7474 sk->sk_max_ack_backlog = backlog;
7476 err = sctp_listen_start(sk, backlog);
7488 * This function is done by modeling the current datagram_poll() and the
7489 * tcp_poll(). Note that, based on these implementations, we don't
7490 * lock the socket in this function, even though it seems that,
7491 * ideally, locking or some other mechanisms can be used to ensure
7492 * the integrity of the counters (sndbuf and wmem_alloc) used
7493 * in this place. We assume that we don't need locks either until proven
7496 * Another thing to note is that we include the Async I/O support
7497 * here, again, by modeling the current TCP/UDP code. We don't have
7498 * a good way to test with it yet.
7500 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
7502 struct sock *sk = sock->sk;
7503 struct sctp_sock *sp = sctp_sk(sk);
7506 poll_wait(file, sk_sleep(sk), wait);
7508 sock_rps_record_flow(sk);
7510 /* A TCP-style listening socket becomes readable when the accept queue
7513 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
7514 return (!list_empty(&sp->ep->asocs)) ?
7515 (EPOLLIN | EPOLLRDNORM) : 0;
7519 /* Is there any exceptional events? */
7520 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7522 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
7523 if (sk->sk_shutdown & RCV_SHUTDOWN)
7524 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
7525 if (sk->sk_shutdown == SHUTDOWN_MASK)
7528 /* Is it readable? Reconsider this code with TCP-style support. */
7529 if (!skb_queue_empty(&sk->sk_receive_queue))
7530 mask |= EPOLLIN | EPOLLRDNORM;
7532 /* The association is either gone or not ready. */
7533 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
7536 /* Is it writable? */
7537 if (sctp_writeable(sk)) {
7538 mask |= EPOLLOUT | EPOLLWRNORM;
7540 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
7542 * Since the socket is not locked, the buffer
7543 * might be made available after the writeable check and
7544 * before the bit is set. This could cause a lost I/O
7545 * signal. tcp_poll() has a race breaker for this race
7546 * condition. Based on their implementation, we put
7547 * in the following code to cover it as well.
7549 if (sctp_writeable(sk))
7550 mask |= EPOLLOUT | EPOLLWRNORM;
7555 /********************************************************************
7556 * 2nd Level Abstractions
7557 ********************************************************************/
7559 static struct sctp_bind_bucket *sctp_bucket_create(
7560 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
7562 struct sctp_bind_bucket *pp;
7564 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
7566 SCTP_DBG_OBJCNT_INC(bind_bucket);
7569 INIT_HLIST_HEAD(&pp->owner);
7571 hlist_add_head(&pp->node, &head->chain);
7576 /* Caller must hold hashbucket lock for this tb with local BH disabled */
7577 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
7579 if (pp && hlist_empty(&pp->owner)) {
7580 __hlist_del(&pp->node);
7581 kmem_cache_free(sctp_bucket_cachep, pp);
7582 SCTP_DBG_OBJCNT_DEC(bind_bucket);
7586 /* Release this socket's reference to a local port. */
7587 static inline void __sctp_put_port(struct sock *sk)
7589 struct sctp_bind_hashbucket *head =
7590 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
7591 inet_sk(sk)->inet_num)];
7592 struct sctp_bind_bucket *pp;
7594 spin_lock(&head->lock);
7595 pp = sctp_sk(sk)->bind_hash;
7596 __sk_del_bind_node(sk);
7597 sctp_sk(sk)->bind_hash = NULL;
7598 inet_sk(sk)->inet_num = 0;
7599 sctp_bucket_destroy(pp);
7600 spin_unlock(&head->lock);
7603 void sctp_put_port(struct sock *sk)
7606 __sctp_put_port(sk);
7611 * The system picks an ephemeral port and choose an address set equivalent
7612 * to binding with a wildcard address.
7613 * One of those addresses will be the primary address for the association.
7614 * This automatically enables the multihoming capability of SCTP.
7616 static int sctp_autobind(struct sock *sk)
7618 union sctp_addr autoaddr;
7622 /* Initialize a local sockaddr structure to INADDR_ANY. */
7623 af = sctp_sk(sk)->pf->af;
7625 port = htons(inet_sk(sk)->inet_num);
7626 af->inaddr_any(&autoaddr, port);
7628 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
7631 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
7634 * 4.2 The cmsghdr Structure *
7636 * When ancillary data is sent or received, any number of ancillary data
7637 * objects can be specified by the msg_control and msg_controllen members of
7638 * the msghdr structure, because each object is preceded by
7639 * a cmsghdr structure defining the object's length (the cmsg_len member).
7640 * Historically Berkeley-derived implementations have passed only one object
7641 * at a time, but this API allows multiple objects to be
7642 * passed in a single call to sendmsg() or recvmsg(). The following example
7643 * shows two ancillary data objects in a control buffer.
7645 * |<--------------------------- msg_controllen -------------------------->|
7648 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
7650 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
7653 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
7655 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
7658 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7659 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
7661 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
7663 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
7670 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
7672 struct msghdr *my_msg = (struct msghdr *)msg;
7673 struct cmsghdr *cmsg;
7675 for_each_cmsghdr(cmsg, my_msg) {
7676 if (!CMSG_OK(my_msg, cmsg))
7679 /* Should we parse this header or ignore? */
7680 if (cmsg->cmsg_level != IPPROTO_SCTP)
7683 /* Strictly check lengths following example in SCM code. */
7684 switch (cmsg->cmsg_type) {
7686 /* SCTP Socket API Extension
7687 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
7689 * This cmsghdr structure provides information for
7690 * initializing new SCTP associations with sendmsg().
7691 * The SCTP_INITMSG socket option uses this same data
7692 * structure. This structure is not used for
7695 * cmsg_level cmsg_type cmsg_data[]
7696 * ------------ ------------ ----------------------
7697 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
7699 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
7702 cmsgs->init = CMSG_DATA(cmsg);
7706 /* SCTP Socket API Extension
7707 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
7709 * This cmsghdr structure specifies SCTP options for
7710 * sendmsg() and describes SCTP header information
7711 * about a received message through recvmsg().
7713 * cmsg_level cmsg_type cmsg_data[]
7714 * ------------ ------------ ----------------------
7715 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
7717 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
7720 cmsgs->srinfo = CMSG_DATA(cmsg);
7722 if (cmsgs->srinfo->sinfo_flags &
7723 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7724 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7725 SCTP_ABORT | SCTP_EOF))
7730 /* SCTP Socket API Extension
7731 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
7733 * This cmsghdr structure specifies SCTP options for
7734 * sendmsg(). This structure and SCTP_RCVINFO replaces
7735 * SCTP_SNDRCV which has been deprecated.
7737 * cmsg_level cmsg_type cmsg_data[]
7738 * ------------ ------------ ---------------------
7739 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
7741 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
7744 cmsgs->sinfo = CMSG_DATA(cmsg);
7746 if (cmsgs->sinfo->snd_flags &
7747 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7748 SCTP_SACK_IMMEDIATELY | SCTP_PR_SCTP_MASK |
7749 SCTP_ABORT | SCTP_EOF))
7761 * Wait for a packet..
7762 * Note: This function is the same function as in core/datagram.c
7763 * with a few modifications to make lksctp work.
7765 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
7770 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
7772 /* Socket errors? */
7773 error = sock_error(sk);
7777 if (!skb_queue_empty(&sk->sk_receive_queue))
7780 /* Socket shut down? */
7781 if (sk->sk_shutdown & RCV_SHUTDOWN)
7784 /* Sequenced packets can come disconnected. If so we report the
7789 /* Is there a good reason to think that we may receive some data? */
7790 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
7793 /* Handle signals. */
7794 if (signal_pending(current))
7797 /* Let another process have a go. Since we are going to sleep
7798 * anyway. Note: This may cause odd behaviors if the message
7799 * does not fit in the user's buffer, but this seems to be the
7800 * only way to honor MSG_DONTWAIT realistically.
7803 *timeo_p = schedule_timeout(*timeo_p);
7807 finish_wait(sk_sleep(sk), &wait);
7811 error = sock_intr_errno(*timeo_p);
7814 finish_wait(sk_sleep(sk), &wait);
7819 /* Receive a datagram.
7820 * Note: This is pretty much the same routine as in core/datagram.c
7821 * with a few changes to make lksctp work.
7823 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
7824 int noblock, int *err)
7827 struct sk_buff *skb;
7830 timeo = sock_rcvtimeo(sk, noblock);
7832 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
7833 MAX_SCHEDULE_TIMEOUT);
7836 /* Again only user level code calls this function,
7837 * so nothing interrupt level
7838 * will suddenly eat the receive_queue.
7840 * Look at current nfs client by the way...
7841 * However, this function was correct in any case. 8)
7843 if (flags & MSG_PEEK) {
7844 skb = skb_peek(&sk->sk_receive_queue);
7846 refcount_inc(&skb->users);
7848 skb = __skb_dequeue(&sk->sk_receive_queue);
7854 /* Caller is allowed not to check sk->sk_err before calling. */
7855 error = sock_error(sk);
7859 if (sk->sk_shutdown & RCV_SHUTDOWN)
7862 if (sk_can_busy_loop(sk)) {
7863 sk_busy_loop(sk, noblock);
7865 if (!skb_queue_empty(&sk->sk_receive_queue))
7869 /* User doesn't want to wait. */
7873 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
7882 /* If sndbuf has changed, wake up per association sndbuf waiters. */
7883 static void __sctp_write_space(struct sctp_association *asoc)
7885 struct sock *sk = asoc->base.sk;
7887 if (sctp_wspace(asoc) <= 0)
7890 if (waitqueue_active(&asoc->wait))
7891 wake_up_interruptible(&asoc->wait);
7893 if (sctp_writeable(sk)) {
7894 struct socket_wq *wq;
7897 wq = rcu_dereference(sk->sk_wq);
7899 if (waitqueue_active(&wq->wait))
7900 wake_up_interruptible(&wq->wait);
7902 /* Note that we try to include the Async I/O support
7903 * here by modeling from the current TCP/UDP code.
7904 * We have not tested with it yet.
7906 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
7907 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
7913 static void sctp_wake_up_waiters(struct sock *sk,
7914 struct sctp_association *asoc)
7916 struct sctp_association *tmp = asoc;
7918 /* We do accounting for the sndbuf space per association,
7919 * so we only need to wake our own association.
7921 if (asoc->ep->sndbuf_policy)
7922 return __sctp_write_space(asoc);
7924 /* If association goes down and is just flushing its
7925 * outq, then just normally notify others.
7927 if (asoc->base.dead)
7928 return sctp_write_space(sk);
7930 /* Accounting for the sndbuf space is per socket, so we
7931 * need to wake up others, try to be fair and in case of
7932 * other associations, let them have a go first instead
7933 * of just doing a sctp_write_space() call.
7935 * Note that we reach sctp_wake_up_waiters() only when
7936 * associations free up queued chunks, thus we are under
7937 * lock and the list of associations on a socket is
7938 * guaranteed not to change.
7940 for (tmp = list_next_entry(tmp, asocs); 1;
7941 tmp = list_next_entry(tmp, asocs)) {
7942 /* Manually skip the head element. */
7943 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
7945 /* Wake up association. */
7946 __sctp_write_space(tmp);
7947 /* We've reached the end. */
7953 /* Do accounting for the sndbuf space.
7954 * Decrement the used sndbuf space of the corresponding association by the
7955 * data size which was just transmitted(freed).
7957 static void sctp_wfree(struct sk_buff *skb)
7959 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
7960 struct sctp_association *asoc = chunk->asoc;
7961 struct sock *sk = asoc->base.sk;
7963 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
7964 sizeof(struct sk_buff) +
7965 sizeof(struct sctp_chunk);
7967 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
7970 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
7972 sk->sk_wmem_queued -= skb->truesize;
7973 sk_mem_uncharge(sk, skb->truesize);
7976 sctp_wake_up_waiters(sk, asoc);
7978 sctp_association_put(asoc);
7981 /* Do accounting for the receive space on the socket.
7982 * Accounting for the association is done in ulpevent.c
7983 * We set this as a destructor for the cloned data skbs so that
7984 * accounting is done at the correct time.
7986 void sctp_sock_rfree(struct sk_buff *skb)
7988 struct sock *sk = skb->sk;
7989 struct sctp_ulpevent *event = sctp_skb2event(skb);
7991 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
7994 * Mimic the behavior of sock_rfree
7996 sk_mem_uncharge(sk, event->rmem_len);
8000 /* Helper function to wait for space in the sndbuf. */
8001 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8004 struct sock *sk = asoc->base.sk;
8005 long current_timeo = *timeo_p;
8009 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8012 /* Increment the association's refcnt. */
8013 sctp_association_hold(asoc);
8015 /* Wait on the association specific sndbuf space. */
8017 prepare_to_wait_exclusive(&asoc->wait, &wait,
8018 TASK_INTERRUPTIBLE);
8019 if (asoc->base.dead)
8023 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8025 if (signal_pending(current))
8026 goto do_interrupted;
8027 if (msg_len <= sctp_wspace(asoc))
8030 /* Let another process have a go. Since we are going
8034 current_timeo = schedule_timeout(current_timeo);
8036 if (sk != asoc->base.sk)
8039 *timeo_p = current_timeo;
8043 finish_wait(&asoc->wait, &wait);
8045 /* Release the association's refcnt. */
8046 sctp_association_put(asoc);
8059 err = sock_intr_errno(*timeo_p);
8067 void sctp_data_ready(struct sock *sk)
8069 struct socket_wq *wq;
8072 wq = rcu_dereference(sk->sk_wq);
8073 if (skwq_has_sleeper(wq))
8074 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8075 EPOLLRDNORM | EPOLLRDBAND);
8076 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8080 /* If socket sndbuf has changed, wake up all per association waiters. */
8081 void sctp_write_space(struct sock *sk)
8083 struct sctp_association *asoc;
8085 /* Wake up the tasks in each wait queue. */
8086 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
8087 __sctp_write_space(asoc);
8091 /* Is there any sndbuf space available on the socket?
8093 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
8094 * associations on the same socket. For a UDP-style socket with
8095 * multiple associations, it is possible for it to be "unwriteable"
8096 * prematurely. I assume that this is acceptable because
8097 * a premature "unwriteable" is better than an accidental "writeable" which
8098 * would cause an unwanted block under certain circumstances. For the 1-1
8099 * UDP-style sockets or TCP-style sockets, this code should work.
8102 static int sctp_writeable(struct sock *sk)
8106 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
8112 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
8113 * returns immediately with EINPROGRESS.
8115 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
8117 struct sock *sk = asoc->base.sk;
8119 long current_timeo = *timeo_p;
8122 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
8124 /* Increment the association's refcnt. */
8125 sctp_association_hold(asoc);
8128 prepare_to_wait_exclusive(&asoc->wait, &wait,
8129 TASK_INTERRUPTIBLE);
8132 if (sk->sk_shutdown & RCV_SHUTDOWN)
8134 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
8137 if (signal_pending(current))
8138 goto do_interrupted;
8140 if (sctp_state(asoc, ESTABLISHED))
8143 /* Let another process have a go. Since we are going
8147 current_timeo = schedule_timeout(current_timeo);
8150 *timeo_p = current_timeo;
8154 finish_wait(&asoc->wait, &wait);
8156 /* Release the association's refcnt. */
8157 sctp_association_put(asoc);
8162 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
8165 err = -ECONNREFUSED;
8169 err = sock_intr_errno(*timeo_p);
8177 static int sctp_wait_for_accept(struct sock *sk, long timeo)
8179 struct sctp_endpoint *ep;
8183 ep = sctp_sk(sk)->ep;
8187 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
8188 TASK_INTERRUPTIBLE);
8190 if (list_empty(&ep->asocs)) {
8192 timeo = schedule_timeout(timeo);
8197 if (!sctp_sstate(sk, LISTENING))
8201 if (!list_empty(&ep->asocs))
8204 err = sock_intr_errno(timeo);
8205 if (signal_pending(current))
8213 finish_wait(sk_sleep(sk), &wait);
8218 static void sctp_wait_for_close(struct sock *sk, long timeout)
8223 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8224 if (list_empty(&sctp_sk(sk)->ep->asocs))
8227 timeout = schedule_timeout(timeout);
8229 } while (!signal_pending(current) && timeout);
8231 finish_wait(sk_sleep(sk), &wait);
8234 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
8236 struct sk_buff *frag;
8241 /* Don't forget the fragments. */
8242 skb_walk_frags(skb, frag)
8243 sctp_skb_set_owner_r_frag(frag, sk);
8246 sctp_skb_set_owner_r(skb, sk);
8249 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
8250 struct sctp_association *asoc)
8252 struct inet_sock *inet = inet_sk(sk);
8253 struct inet_sock *newinet;
8255 newsk->sk_type = sk->sk_type;
8256 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
8257 newsk->sk_flags = sk->sk_flags;
8258 newsk->sk_tsflags = sk->sk_tsflags;
8259 newsk->sk_no_check_tx = sk->sk_no_check_tx;
8260 newsk->sk_no_check_rx = sk->sk_no_check_rx;
8261 newsk->sk_reuse = sk->sk_reuse;
8263 newsk->sk_shutdown = sk->sk_shutdown;
8264 newsk->sk_destruct = sctp_destruct_sock;
8265 newsk->sk_family = sk->sk_family;
8266 newsk->sk_protocol = IPPROTO_SCTP;
8267 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
8268 newsk->sk_sndbuf = sk->sk_sndbuf;
8269 newsk->sk_rcvbuf = sk->sk_rcvbuf;
8270 newsk->sk_lingertime = sk->sk_lingertime;
8271 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
8272 newsk->sk_sndtimeo = sk->sk_sndtimeo;
8273 newsk->sk_rxhash = sk->sk_rxhash;
8275 newinet = inet_sk(newsk);
8277 /* Initialize sk's sport, dport, rcv_saddr and daddr for
8278 * getsockname() and getpeername()
8280 newinet->inet_sport = inet->inet_sport;
8281 newinet->inet_saddr = inet->inet_saddr;
8282 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
8283 newinet->inet_dport = htons(asoc->peer.port);
8284 newinet->pmtudisc = inet->pmtudisc;
8285 newinet->inet_id = asoc->next_tsn ^ jiffies;
8287 newinet->uc_ttl = inet->uc_ttl;
8288 newinet->mc_loop = 1;
8289 newinet->mc_ttl = 1;
8290 newinet->mc_index = 0;
8291 newinet->mc_list = NULL;
8293 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
8294 net_enable_timestamp();
8296 security_sk_clone(sk, newsk);
8299 static inline void sctp_copy_descendant(struct sock *sk_to,
8300 const struct sock *sk_from)
8302 int ancestor_size = sizeof(struct inet_sock) +
8303 sizeof(struct sctp_sock) -
8304 offsetof(struct sctp_sock, auto_asconf_list);
8306 if (sk_from->sk_family == PF_INET6)
8307 ancestor_size += sizeof(struct ipv6_pinfo);
8309 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
8312 /* Populate the fields of the newsk from the oldsk and migrate the assoc
8313 * and its messages to the newsk.
8315 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
8316 struct sctp_association *assoc,
8317 enum sctp_socket_type type)
8319 struct sctp_sock *oldsp = sctp_sk(oldsk);
8320 struct sctp_sock *newsp = sctp_sk(newsk);
8321 struct sctp_bind_bucket *pp; /* hash list port iterator */
8322 struct sctp_endpoint *newep = newsp->ep;
8323 struct sk_buff *skb, *tmp;
8324 struct sctp_ulpevent *event;
8325 struct sctp_bind_hashbucket *head;
8327 /* Migrate socket buffer sizes and all the socket level options to the
8330 newsk->sk_sndbuf = oldsk->sk_sndbuf;
8331 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
8332 /* Brute force copy old sctp opt. */
8333 sctp_copy_descendant(newsk, oldsk);
8335 /* Restore the ep value that was overwritten with the above structure
8341 /* Hook this new socket in to the bind_hash list. */
8342 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
8343 inet_sk(oldsk)->inet_num)];
8344 spin_lock_bh(&head->lock);
8345 pp = sctp_sk(oldsk)->bind_hash;
8346 sk_add_bind_node(newsk, &pp->owner);
8347 sctp_sk(newsk)->bind_hash = pp;
8348 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8349 spin_unlock_bh(&head->lock);
8351 /* Copy the bind_addr list from the original endpoint to the new
8352 * endpoint so that we can handle restarts properly
8354 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
8355 &oldsp->ep->base.bind_addr, GFP_KERNEL);
8357 /* Move any messages in the old socket's receive queue that are for the
8358 * peeled off association to the new socket's receive queue.
8360 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
8361 event = sctp_skb2event(skb);
8362 if (event->asoc == assoc) {
8363 __skb_unlink(skb, &oldsk->sk_receive_queue);
8364 __skb_queue_tail(&newsk->sk_receive_queue, skb);
8365 sctp_skb_set_owner_r_frag(skb, newsk);
8369 /* Clean up any messages pending delivery due to partial
8370 * delivery. Three cases:
8371 * 1) No partial deliver; no work.
8372 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
8373 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
8375 skb_queue_head_init(&newsp->pd_lobby);
8376 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
8378 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
8379 struct sk_buff_head *queue;
8381 /* Decide which queue to move pd_lobby skbs to. */
8382 if (assoc->ulpq.pd_mode) {
8383 queue = &newsp->pd_lobby;
8385 queue = &newsk->sk_receive_queue;
8387 /* Walk through the pd_lobby, looking for skbs that
8388 * need moved to the new socket.
8390 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
8391 event = sctp_skb2event(skb);
8392 if (event->asoc == assoc) {
8393 __skb_unlink(skb, &oldsp->pd_lobby);
8394 __skb_queue_tail(queue, skb);
8395 sctp_skb_set_owner_r_frag(skb, newsk);
8399 /* Clear up any skbs waiting for the partial
8400 * delivery to finish.
8402 if (assoc->ulpq.pd_mode)
8403 sctp_clear_pd(oldsk, NULL);
8407 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8409 /* Set the type of socket to indicate that it is peeled off from the
8410 * original UDP-style socket or created with the accept() call on a
8411 * TCP-style socket..
8415 /* Mark the new socket "in-use" by the user so that any packets
8416 * that may arrive on the association after we've moved it are
8417 * queued to the backlog. This prevents a potential race between
8418 * backlog processing on the old socket and new-packet processing
8419 * on the new socket.
8421 * The caller has just allocated newsk so we can guarantee that other
8422 * paths won't try to lock it and then oldsk.
8424 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8425 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
8426 sctp_assoc_migrate(assoc, newsk);
8427 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
8429 /* If the association on the newsk is already closed before accept()
8430 * is called, set RCV_SHUTDOWN flag.
8432 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8433 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
8434 newsk->sk_shutdown |= RCV_SHUTDOWN;
8436 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8439 release_sock(newsk);
8443 /* This proto struct describes the ULP interface for SCTP. */
8444 struct proto sctp_prot = {
8446 .owner = THIS_MODULE,
8447 .close = sctp_close,
8448 .connect = sctp_connect,
8449 .disconnect = sctp_disconnect,
8450 .accept = sctp_accept,
8451 .ioctl = sctp_ioctl,
8452 .init = sctp_init_sock,
8453 .destroy = sctp_destroy_sock,
8454 .shutdown = sctp_shutdown,
8455 .setsockopt = sctp_setsockopt,
8456 .getsockopt = sctp_getsockopt,
8457 .sendmsg = sctp_sendmsg,
8458 .recvmsg = sctp_recvmsg,
8460 .backlog_rcv = sctp_backlog_rcv,
8462 .unhash = sctp_unhash,
8463 .get_port = sctp_get_port,
8464 .obj_size = sizeof(struct sctp_sock),
8465 .useroffset = offsetof(struct sctp_sock, subscribe),
8466 .usersize = offsetof(struct sctp_sock, initmsg) -
8467 offsetof(struct sctp_sock, subscribe) +
8468 sizeof_field(struct sctp_sock, initmsg),
8469 .sysctl_mem = sysctl_sctp_mem,
8470 .sysctl_rmem = sysctl_sctp_rmem,
8471 .sysctl_wmem = sysctl_sctp_wmem,
8472 .memory_pressure = &sctp_memory_pressure,
8473 .enter_memory_pressure = sctp_enter_memory_pressure,
8474 .memory_allocated = &sctp_memory_allocated,
8475 .sockets_allocated = &sctp_sockets_allocated,
8478 #if IS_ENABLED(CONFIG_IPV6)
8480 #include <net/transp_v6.h>
8481 static void sctp_v6_destroy_sock(struct sock *sk)
8483 sctp_destroy_sock(sk);
8484 inet6_destroy_sock(sk);
8487 struct proto sctpv6_prot = {
8489 .owner = THIS_MODULE,
8490 .close = sctp_close,
8491 .connect = sctp_connect,
8492 .disconnect = sctp_disconnect,
8493 .accept = sctp_accept,
8494 .ioctl = sctp_ioctl,
8495 .init = sctp_init_sock,
8496 .destroy = sctp_v6_destroy_sock,
8497 .shutdown = sctp_shutdown,
8498 .setsockopt = sctp_setsockopt,
8499 .getsockopt = sctp_getsockopt,
8500 .sendmsg = sctp_sendmsg,
8501 .recvmsg = sctp_recvmsg,
8503 .backlog_rcv = sctp_backlog_rcv,
8505 .unhash = sctp_unhash,
8506 .get_port = sctp_get_port,
8507 .obj_size = sizeof(struct sctp6_sock),
8508 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
8509 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
8510 offsetof(struct sctp6_sock, sctp.subscribe) +
8511 sizeof_field(struct sctp6_sock, sctp.initmsg),
8512 .sysctl_mem = sysctl_sctp_mem,
8513 .sysctl_rmem = sysctl_sctp_rmem,
8514 .sysctl_wmem = sysctl_sctp_wmem,
8515 .memory_pressure = &sctp_memory_pressure,
8516 .enter_memory_pressure = sctp_enter_memory_pressure,
8517 .memory_allocated = &sctp_memory_allocated,
8518 .sockets_allocated = &sctp_sockets_allocated,
8520 #endif /* IS_ENABLED(CONFIG_IPV6) */