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, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/types.h>
63 #include <linux/kernel.h>
64 #include <linux/wait.h>
65 #include <linux/time.h>
67 #include <linux/capability.h>
68 #include <linux/fcntl.h>
69 #include <linux/poll.h>
70 #include <linux/init.h>
71 #include <linux/crypto.h>
72 #include <linux/slab.h>
73 #include <linux/file.h>
77 #include <net/route.h>
79 #include <net/inet_common.h>
81 #include <linux/socket.h> /* for sa_family_t */
82 #include <linux/export.h>
84 #include <net/sctp/sctp.h>
85 #include <net/sctp/sm.h>
87 /* WARNING: Please do not remove the SCTP_STATIC attribute to
88 * any of the functions below as they are used to export functions
89 * used by a project regression testsuite.
92 /* Forward declarations for internal helper functions. */
93 static int sctp_writeable(struct sock *sk);
94 static void sctp_wfree(struct sk_buff *skb);
95 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
97 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
98 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
99 static int sctp_wait_for_accept(struct sock *sk, long timeo);
100 static void sctp_wait_for_close(struct sock *sk, long timeo);
101 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
102 union sctp_addr *addr, int len);
103 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
104 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
105 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
106 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
107 static int sctp_send_asconf(struct sctp_association *asoc,
108 struct sctp_chunk *chunk);
109 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
110 static int sctp_autobind(struct sock *sk);
111 static void sctp_sock_migrate(struct sock *, struct sock *,
112 struct sctp_association *, sctp_socket_type_t);
114 extern struct kmem_cache *sctp_bucket_cachep;
115 extern long sysctl_sctp_mem[3];
116 extern int sysctl_sctp_rmem[3];
117 extern int sysctl_sctp_wmem[3];
119 static int sctp_memory_pressure;
120 static atomic_long_t sctp_memory_allocated;
121 struct percpu_counter sctp_sockets_allocated;
123 static void sctp_enter_memory_pressure(struct sock *sk)
125 sctp_memory_pressure = 1;
129 /* Get the sndbuf space available at the time on the association. */
130 static inline int sctp_wspace(struct sctp_association *asoc)
134 if (asoc->ep->sndbuf_policy)
135 amt = asoc->sndbuf_used;
137 amt = sk_wmem_alloc_get(asoc->base.sk);
139 if (amt >= asoc->base.sk->sk_sndbuf) {
140 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
143 amt = sk_stream_wspace(asoc->base.sk);
148 amt = asoc->base.sk->sk_sndbuf - amt;
153 /* Increment the used sndbuf space count of the corresponding association by
154 * the size of the outgoing data chunk.
155 * Also, set the skb destructor for sndbuf accounting later.
157 * Since it is always 1-1 between chunk and skb, and also a new skb is always
158 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
159 * destructor in the data chunk skb for the purpose of the sndbuf space
162 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
164 struct sctp_association *asoc = chunk->asoc;
165 struct sock *sk = asoc->base.sk;
167 /* The sndbuf space is tracked per association. */
168 sctp_association_hold(asoc);
170 skb_set_owner_w(chunk->skb, sk);
172 chunk->skb->destructor = sctp_wfree;
173 /* Save the chunk pointer in skb for sctp_wfree to use later. */
174 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
176 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
177 sizeof(struct sk_buff) +
178 sizeof(struct sctp_chunk);
180 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
181 sk->sk_wmem_queued += chunk->skb->truesize;
182 sk_mem_charge(sk, chunk->skb->truesize);
185 /* Verify that this is a valid address. */
186 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
191 /* Verify basic sockaddr. */
192 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
196 /* Is this a valid SCTP address? */
197 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
200 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
206 /* Look up the association by its id. If this is not a UDP-style
207 * socket, the ID field is always ignored.
209 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
211 struct sctp_association *asoc = NULL;
213 /* If this is not a UDP-style socket, assoc id should be ignored. */
214 if (!sctp_style(sk, UDP)) {
215 /* Return NULL if the socket state is not ESTABLISHED. It
216 * could be a TCP-style listening socket or a socket which
217 * hasn't yet called connect() to establish an association.
219 if (!sctp_sstate(sk, ESTABLISHED))
222 /* Get the first and the only association from the list. */
223 if (!list_empty(&sctp_sk(sk)->ep->asocs))
224 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
225 struct sctp_association, asocs);
229 /* Otherwise this is a UDP-style socket. */
230 if (!id || (id == (sctp_assoc_t)-1))
233 spin_lock_bh(&sctp_assocs_id_lock);
234 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
235 spin_unlock_bh(&sctp_assocs_id_lock);
237 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
243 /* Look up the transport from an address and an assoc id. If both address and
244 * id are specified, the associations matching the address and the id should be
247 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
248 struct sockaddr_storage *addr,
251 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
252 struct sctp_transport *transport;
253 union sctp_addr *laddr = (union sctp_addr *)addr;
255 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
262 id_asoc = sctp_id2assoc(sk, id);
263 if (id_asoc && (id_asoc != addr_asoc))
266 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
267 (union sctp_addr *)addr);
272 /* API 3.1.2 bind() - UDP Style Syntax
273 * The syntax of bind() is,
275 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
277 * sd - the socket descriptor returned by socket().
278 * addr - the address structure (struct sockaddr_in or struct
279 * sockaddr_in6 [RFC 2553]),
280 * addr_len - the size of the address structure.
282 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
288 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
291 /* Disallow binding twice. */
292 if (!sctp_sk(sk)->ep->base.bind_addr.port)
293 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
298 sctp_release_sock(sk);
303 static long sctp_get_port_local(struct sock *, union sctp_addr *);
305 /* Verify this is a valid sockaddr. */
306 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
307 union sctp_addr *addr, int len)
311 /* Check minimum size. */
312 if (len < sizeof (struct sockaddr))
315 /* V4 mapped address are really of AF_INET family */
316 if (addr->sa.sa_family == AF_INET6 &&
317 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
318 if (!opt->pf->af_supported(AF_INET, opt))
321 /* Does this PF support this AF? */
322 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
326 /* If we get this far, af is valid. */
327 af = sctp_get_af_specific(addr->sa.sa_family);
329 if (len < af->sockaddr_len)
335 /* Bind a local address either to an endpoint or to an association. */
336 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
338 struct net *net = sock_net(sk);
339 struct sctp_sock *sp = sctp_sk(sk);
340 struct sctp_endpoint *ep = sp->ep;
341 struct sctp_bind_addr *bp = &ep->base.bind_addr;
346 /* Common sockaddr verification. */
347 af = sctp_sockaddr_af(sp, addr, len);
349 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
354 snum = ntohs(addr->v4.sin_port);
356 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
357 ", port: %d, new port: %d, len: %d)\n",
363 /* PF specific bind() address verification. */
364 if (!sp->pf->bind_verify(sp, addr))
365 return -EADDRNOTAVAIL;
367 /* We must either be unbound, or bind to the same port.
368 * It's OK to allow 0 ports if we are already bound.
369 * We'll just inhert an already bound port in this case
374 else if (snum != bp->port) {
375 SCTP_DEBUG_PRINTK("sctp_do_bind:"
376 " New port %d does not match existing port "
377 "%d.\n", snum, bp->port);
382 if (snum && snum < PROT_SOCK &&
383 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
386 /* See if the address matches any of the addresses we may have
387 * already bound before checking against other endpoints.
389 if (sctp_bind_addr_match(bp, addr, sp))
392 /* Make sure we are allowed to bind here.
393 * The function sctp_get_port_local() does duplicate address
396 addr->v4.sin_port = htons(snum);
397 if ((ret = sctp_get_port_local(sk, addr))) {
401 /* Refresh ephemeral port. */
403 bp->port = inet_sk(sk)->inet_num;
405 /* Add the address to the bind address list.
406 * Use GFP_ATOMIC since BHs will be disabled.
408 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
410 /* Copy back into socket for getsockname() use. */
412 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
413 af->to_sk_saddr(addr, sk);
419 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
421 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
422 * at any one time. If a sender, after sending an ASCONF chunk, decides
423 * it needs to transfer another ASCONF Chunk, it MUST wait until the
424 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
425 * subsequent ASCONF. Note this restriction binds each side, so at any
426 * time two ASCONF may be in-transit on any given association (one sent
427 * from each endpoint).
429 static int sctp_send_asconf(struct sctp_association *asoc,
430 struct sctp_chunk *chunk)
432 struct net *net = sock_net(asoc->base.sk);
435 /* If there is an outstanding ASCONF chunk, queue it for later
438 if (asoc->addip_last_asconf) {
439 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
443 /* Hold the chunk until an ASCONF_ACK is received. */
444 sctp_chunk_hold(chunk);
445 retval = sctp_primitive_ASCONF(net, asoc, chunk);
447 sctp_chunk_free(chunk);
449 asoc->addip_last_asconf = chunk;
455 /* Add a list of addresses as bind addresses to local endpoint or
458 * Basically run through each address specified in the addrs/addrcnt
459 * array/length pair, determine if it is IPv6 or IPv4 and call
460 * sctp_do_bind() on it.
462 * If any of them fails, then the operation will be reversed and the
463 * ones that were added will be removed.
465 * Only sctp_setsockopt_bindx() is supposed to call this function.
467 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
472 struct sockaddr *sa_addr;
475 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
479 for (cnt = 0; cnt < addrcnt; cnt++) {
480 /* The list may contain either IPv4 or IPv6 address;
481 * determine the address length for walking thru the list.
484 af = sctp_get_af_specific(sa_addr->sa_family);
490 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
493 addr_buf += af->sockaddr_len;
497 /* Failed. Cleanup the ones that have been added */
499 sctp_bindx_rem(sk, addrs, cnt);
507 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
508 * associations that are part of the endpoint indicating that a list of local
509 * addresses are added to the endpoint.
511 * If any of the addresses is already in the bind address list of the
512 * association, we do not send the chunk for that association. But it will not
513 * affect other associations.
515 * Only sctp_setsockopt_bindx() is supposed to call this function.
517 static int sctp_send_asconf_add_ip(struct sock *sk,
518 struct sockaddr *addrs,
521 struct net *net = sock_net(sk);
522 struct sctp_sock *sp;
523 struct sctp_endpoint *ep;
524 struct sctp_association *asoc;
525 struct sctp_bind_addr *bp;
526 struct sctp_chunk *chunk;
527 struct sctp_sockaddr_entry *laddr;
528 union sctp_addr *addr;
529 union sctp_addr saveaddr;
536 if (!net->sctp.addip_enable)
542 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
543 __func__, sk, addrs, addrcnt);
545 list_for_each_entry(asoc, &ep->asocs, asocs) {
547 if (!asoc->peer.asconf_capable)
550 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
553 if (!sctp_state(asoc, ESTABLISHED))
556 /* Check if any address in the packed array of addresses is
557 * in the bind address list of the association. If so,
558 * do not send the asconf chunk to its peer, but continue with
559 * other associations.
562 for (i = 0; i < addrcnt; i++) {
564 af = sctp_get_af_specific(addr->v4.sin_family);
570 if (sctp_assoc_lookup_laddr(asoc, addr))
573 addr_buf += af->sockaddr_len;
578 /* Use the first valid address in bind addr list of
579 * association as Address Parameter of ASCONF CHUNK.
581 bp = &asoc->base.bind_addr;
582 p = bp->address_list.next;
583 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
584 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
585 addrcnt, SCTP_PARAM_ADD_IP);
591 /* Add the new addresses to the bind address list with
592 * use_as_src set to 0.
595 for (i = 0; i < addrcnt; i++) {
597 af = sctp_get_af_specific(addr->v4.sin_family);
598 memcpy(&saveaddr, addr, af->sockaddr_len);
599 retval = sctp_add_bind_addr(bp, &saveaddr,
600 SCTP_ADDR_NEW, GFP_ATOMIC);
601 addr_buf += af->sockaddr_len;
603 if (asoc->src_out_of_asoc_ok) {
604 struct sctp_transport *trans;
606 list_for_each_entry(trans,
607 &asoc->peer.transport_addr_list, transports) {
608 /* Clear the source and route cache */
609 dst_release(trans->dst);
610 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
611 2*asoc->pathmtu, 4380));
612 trans->ssthresh = asoc->peer.i.a_rwnd;
613 trans->rto = asoc->rto_initial;
614 sctp_max_rto(asoc, trans);
615 trans->rtt = trans->srtt = trans->rttvar = 0;
616 sctp_transport_route(trans, NULL,
617 sctp_sk(asoc->base.sk));
620 retval = sctp_send_asconf(asoc, chunk);
627 /* Remove a list of addresses from bind addresses list. Do not remove the
630 * Basically run through each address specified in the addrs/addrcnt
631 * array/length pair, determine if it is IPv6 or IPv4 and call
632 * sctp_del_bind() on it.
634 * If any of them fails, then the operation will be reversed and the
635 * ones that were removed will be added back.
637 * At least one address has to be left; if only one address is
638 * available, the operation will return -EBUSY.
640 * Only sctp_setsockopt_bindx() is supposed to call this function.
642 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
644 struct sctp_sock *sp = sctp_sk(sk);
645 struct sctp_endpoint *ep = sp->ep;
647 struct sctp_bind_addr *bp = &ep->base.bind_addr;
650 union sctp_addr *sa_addr;
653 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
657 for (cnt = 0; cnt < addrcnt; cnt++) {
658 /* If the bind address list is empty or if there is only one
659 * bind address, there is nothing more to be removed (we need
660 * at least one address here).
662 if (list_empty(&bp->address_list) ||
663 (sctp_list_single_entry(&bp->address_list))) {
669 af = sctp_get_af_specific(sa_addr->sa.sa_family);
675 if (!af->addr_valid(sa_addr, sp, NULL)) {
676 retval = -EADDRNOTAVAIL;
680 if (sa_addr->v4.sin_port &&
681 sa_addr->v4.sin_port != htons(bp->port)) {
686 if (!sa_addr->v4.sin_port)
687 sa_addr->v4.sin_port = htons(bp->port);
689 /* FIXME - There is probably a need to check if sk->sk_saddr and
690 * sk->sk_rcv_addr are currently set to one of the addresses to
691 * be removed. This is something which needs to be looked into
692 * when we are fixing the outstanding issues with multi-homing
693 * socket routing and failover schemes. Refer to comments in
694 * sctp_do_bind(). -daisy
696 retval = sctp_del_bind_addr(bp, sa_addr);
698 addr_buf += af->sockaddr_len;
701 /* Failed. Add the ones that has been removed back */
703 sctp_bindx_add(sk, addrs, cnt);
711 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
712 * the associations that are part of the endpoint indicating that a list of
713 * local addresses are removed from the endpoint.
715 * If any of the addresses is already in the bind address list of the
716 * association, we do not send the chunk for that association. But it will not
717 * affect other associations.
719 * Only sctp_setsockopt_bindx() is supposed to call this function.
721 static int sctp_send_asconf_del_ip(struct sock *sk,
722 struct sockaddr *addrs,
725 struct net *net = sock_net(sk);
726 struct sctp_sock *sp;
727 struct sctp_endpoint *ep;
728 struct sctp_association *asoc;
729 struct sctp_transport *transport;
730 struct sctp_bind_addr *bp;
731 struct sctp_chunk *chunk;
732 union sctp_addr *laddr;
735 struct sctp_sockaddr_entry *saddr;
741 if (!net->sctp.addip_enable)
747 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
748 __func__, sk, addrs, addrcnt);
750 list_for_each_entry(asoc, &ep->asocs, asocs) {
752 if (!asoc->peer.asconf_capable)
755 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
758 if (!sctp_state(asoc, ESTABLISHED))
761 /* Check if any address in the packed array of addresses is
762 * not present in the bind address list of the association.
763 * If so, do not send the asconf chunk to its peer, but
764 * continue with other associations.
767 for (i = 0; i < addrcnt; i++) {
769 af = sctp_get_af_specific(laddr->v4.sin_family);
775 if (!sctp_assoc_lookup_laddr(asoc, laddr))
778 addr_buf += af->sockaddr_len;
783 /* Find one address in the association's bind address list
784 * that is not in the packed array of addresses. This is to
785 * make sure that we do not delete all the addresses in the
788 bp = &asoc->base.bind_addr;
789 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
791 if ((laddr == NULL) && (addrcnt == 1)) {
792 if (asoc->asconf_addr_del_pending)
794 asoc->asconf_addr_del_pending =
795 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
796 if (asoc->asconf_addr_del_pending == NULL) {
800 asoc->asconf_addr_del_pending->sa.sa_family =
802 asoc->asconf_addr_del_pending->v4.sin_port =
804 if (addrs->sa_family == AF_INET) {
805 struct sockaddr_in *sin;
807 sin = (struct sockaddr_in *)addrs;
808 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
809 } else if (addrs->sa_family == AF_INET6) {
810 struct sockaddr_in6 *sin6;
812 sin6 = (struct sockaddr_in6 *)addrs;
813 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
815 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
816 " at %p\n", asoc, asoc->asconf_addr_del_pending,
817 asoc->asconf_addr_del_pending);
818 asoc->src_out_of_asoc_ok = 1;
823 /* We do not need RCU protection throughout this loop
824 * because this is done under a socket lock from the
827 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
835 /* Reset use_as_src flag for the addresses in the bind address
836 * list that are to be deleted.
839 for (i = 0; i < addrcnt; i++) {
841 af = sctp_get_af_specific(laddr->v4.sin_family);
842 list_for_each_entry(saddr, &bp->address_list, list) {
843 if (sctp_cmp_addr_exact(&saddr->a, laddr))
844 saddr->state = SCTP_ADDR_DEL;
846 addr_buf += af->sockaddr_len;
849 /* Update the route and saddr entries for all the transports
850 * as some of the addresses in the bind address list are
851 * about to be deleted and cannot be used as source addresses.
853 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
855 dst_release(transport->dst);
856 sctp_transport_route(transport, NULL,
857 sctp_sk(asoc->base.sk));
861 /* We don't need to transmit ASCONF */
863 retval = sctp_send_asconf(asoc, chunk);
869 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
870 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
872 struct sock *sk = sctp_opt2sk(sp);
873 union sctp_addr *addr;
876 /* It is safe to write port space in caller. */
878 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
879 af = sctp_get_af_specific(addr->sa.sa_family);
882 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
885 if (addrw->state == SCTP_ADDR_NEW)
886 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
888 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
891 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
894 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
897 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
898 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
901 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
902 * Section 3.1.2 for this usage.
904 * addrs is a pointer to an array of one or more socket addresses. Each
905 * address is contained in its appropriate structure (i.e. struct
906 * sockaddr_in or struct sockaddr_in6) the family of the address type
907 * must be used to distinguish the address length (note that this
908 * representation is termed a "packed array" of addresses). The caller
909 * specifies the number of addresses in the array with addrcnt.
911 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
912 * -1, and sets errno to the appropriate error code.
914 * For SCTP, the port given in each socket address must be the same, or
915 * sctp_bindx() will fail, setting errno to EINVAL.
917 * The flags parameter is formed from the bitwise OR of zero or more of
918 * the following currently defined flags:
920 * SCTP_BINDX_ADD_ADDR
922 * SCTP_BINDX_REM_ADDR
924 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
925 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
926 * addresses from the association. The two flags are mutually exclusive;
927 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
928 * not remove all addresses from an association; sctp_bindx() will
929 * reject such an attempt with EINVAL.
931 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
932 * additional addresses with an endpoint after calling bind(). Or use
933 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
934 * socket is associated with so that no new association accepted will be
935 * associated with those addresses. If the endpoint supports dynamic
936 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
937 * endpoint to send the appropriate message to the peer to change the
938 * peers address lists.
940 * Adding and removing addresses from a connected association is
941 * optional functionality. Implementations that do not support this
942 * functionality should return EOPNOTSUPP.
944 * Basically do nothing but copying the addresses from user to kernel
945 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
946 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
949 * We don't use copy_from_user() for optimization: we first do the
950 * sanity checks (buffer size -fast- and access check-healthy
951 * pointer); if all of those succeed, then we can alloc the memory
952 * (expensive operation) needed to copy the data to kernel. Then we do
953 * the copying without checking the user space area
954 * (__copy_from_user()).
956 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
959 * sk The sk of the socket
960 * addrs The pointer to the addresses in user land
961 * addrssize Size of the addrs buffer
962 * op Operation to perform (add or remove, see the flags of
965 * Returns 0 if ok, <0 errno code on error.
967 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
968 struct sockaddr __user *addrs,
969 int addrs_size, int op)
971 struct sockaddr *kaddrs;
975 struct sockaddr *sa_addr;
979 SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
980 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
982 if (unlikely(addrs_size <= 0))
985 /* Check the user passed a healthy pointer. */
986 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
989 /* Alloc space for the address array in kernel memory. */
990 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
991 if (unlikely(!kaddrs))
994 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
999 /* Walk through the addrs buffer and count the number of addresses. */
1001 while (walk_size < addrs_size) {
1002 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1008 af = sctp_get_af_specific(sa_addr->sa_family);
1010 /* If the address family is not supported or if this address
1011 * causes the address buffer to overflow return EINVAL.
1013 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1018 addr_buf += af->sockaddr_len;
1019 walk_size += af->sockaddr_len;
1024 case SCTP_BINDX_ADD_ADDR:
1025 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1028 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1031 case SCTP_BINDX_REM_ADDR:
1032 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1035 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1049 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1051 * Common routine for handling connect() and sctp_connectx().
1052 * Connect will come in with just a single address.
1054 static int __sctp_connect(struct sock* sk,
1055 struct sockaddr *kaddrs,
1057 sctp_assoc_t *assoc_id)
1059 struct net *net = sock_net(sk);
1060 struct sctp_sock *sp;
1061 struct sctp_endpoint *ep;
1062 struct sctp_association *asoc = NULL;
1063 struct sctp_association *asoc2;
1064 struct sctp_transport *transport;
1072 union sctp_addr *sa_addr = NULL;
1074 unsigned short port;
1075 unsigned int f_flags = 0;
1080 /* connect() cannot be done on a socket that is already in ESTABLISHED
1081 * state - UDP-style peeled off socket or a TCP-style socket that
1082 * is already connected.
1083 * It cannot be done even on a TCP-style listening socket.
1085 if (sctp_sstate(sk, ESTABLISHED) ||
1086 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1091 /* Walk through the addrs buffer and count the number of addresses. */
1093 while (walk_size < addrs_size) {
1094 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1100 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1102 /* If the address family is not supported or if this address
1103 * causes the address buffer to overflow return EINVAL.
1105 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1110 port = ntohs(sa_addr->v4.sin_port);
1112 /* Save current address so we can work with it */
1113 memcpy(&to, sa_addr, af->sockaddr_len);
1115 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1119 /* Make sure the destination port is correctly set
1122 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1127 /* Check if there already is a matching association on the
1128 * endpoint (other than the one created here).
1130 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1131 if (asoc2 && asoc2 != asoc) {
1132 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1139 /* If we could not find a matching association on the endpoint,
1140 * make sure that there is no peeled-off association matching
1141 * the peer address even on another socket.
1143 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1144 err = -EADDRNOTAVAIL;
1149 /* If a bind() or sctp_bindx() is not called prior to
1150 * an sctp_connectx() call, the system picks an
1151 * ephemeral port and will choose an address set
1152 * equivalent to binding with a wildcard address.
1154 if (!ep->base.bind_addr.port) {
1155 if (sctp_autobind(sk)) {
1161 * If an unprivileged user inherits a 1-many
1162 * style socket with open associations on a
1163 * privileged port, it MAY be permitted to
1164 * accept new associations, but it SHOULD NOT
1165 * be permitted to open new associations.
1167 if (ep->base.bind_addr.port < PROT_SOCK &&
1168 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1174 scope = sctp_scope(&to);
1175 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1181 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1189 /* Prime the peer's transport structures. */
1190 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1198 addr_buf += af->sockaddr_len;
1199 walk_size += af->sockaddr_len;
1202 /* In case the user of sctp_connectx() wants an association
1203 * id back, assign one now.
1206 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1211 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1216 /* Initialize sk's dport and daddr for getpeername() */
1217 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1218 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1219 af->to_sk_daddr(sa_addr, sk);
1222 /* in-kernel sockets don't generally have a file allocated to them
1223 * if all they do is call sock_create_kern().
1225 if (sk->sk_socket->file)
1226 f_flags = sk->sk_socket->file->f_flags;
1228 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1230 err = sctp_wait_for_connect(asoc, &timeo);
1231 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1232 *assoc_id = asoc->assoc_id;
1234 /* Don't free association on exit. */
1239 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1240 " kaddrs: %p err: %d\n",
1243 /* sctp_primitive_ASSOCIATE may have added this association
1244 * To the hash table, try to unhash it, just in case, its a noop
1245 * if it wasn't hashed so we're safe
1247 sctp_unhash_established(asoc);
1248 sctp_association_free(asoc);
1253 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1256 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1257 * sctp_assoc_t *asoc);
1259 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1260 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1261 * or IPv6 addresses.
1263 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1264 * Section 3.1.2 for this usage.
1266 * addrs is a pointer to an array of one or more socket addresses. Each
1267 * address is contained in its appropriate structure (i.e. struct
1268 * sockaddr_in or struct sockaddr_in6) the family of the address type
1269 * must be used to distengish the address length (note that this
1270 * representation is termed a "packed array" of addresses). The caller
1271 * specifies the number of addresses in the array with addrcnt.
1273 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1274 * the association id of the new association. On failure, sctp_connectx()
1275 * returns -1, and sets errno to the appropriate error code. The assoc_id
1276 * is not touched by the kernel.
1278 * For SCTP, the port given in each socket address must be the same, or
1279 * sctp_connectx() will fail, setting errno to EINVAL.
1281 * An application can use sctp_connectx to initiate an association with
1282 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1283 * allows a caller to specify multiple addresses at which a peer can be
1284 * reached. The way the SCTP stack uses the list of addresses to set up
1285 * the association is implementation dependent. This function only
1286 * specifies that the stack will try to make use of all the addresses in
1287 * the list when needed.
1289 * Note that the list of addresses passed in is only used for setting up
1290 * the association. It does not necessarily equal the set of addresses
1291 * the peer uses for the resulting association. If the caller wants to
1292 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1293 * retrieve them after the association has been set up.
1295 * Basically do nothing but copying the addresses from user to kernel
1296 * land and invoking either sctp_connectx(). This is used for tunneling
1297 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1299 * We don't use copy_from_user() for optimization: we first do the
1300 * sanity checks (buffer size -fast- and access check-healthy
1301 * pointer); if all of those succeed, then we can alloc the memory
1302 * (expensive operation) needed to copy the data to kernel. Then we do
1303 * the copying without checking the user space area
1304 * (__copy_from_user()).
1306 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1309 * sk The sk of the socket
1310 * addrs The pointer to the addresses in user land
1311 * addrssize Size of the addrs buffer
1313 * Returns >=0 if ok, <0 errno code on error.
1315 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1316 struct sockaddr __user *addrs,
1318 sctp_assoc_t *assoc_id)
1321 struct sockaddr *kaddrs;
1323 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1324 __func__, sk, addrs, addrs_size);
1326 if (unlikely(addrs_size <= 0))
1329 /* Check the user passed a healthy pointer. */
1330 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1333 /* Alloc space for the address array in kernel memory. */
1334 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1335 if (unlikely(!kaddrs))
1338 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1341 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1350 * This is an older interface. It's kept for backward compatibility
1351 * to the option that doesn't provide association id.
1353 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1354 struct sockaddr __user *addrs,
1357 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1361 * New interface for the API. The since the API is done with a socket
1362 * option, to make it simple we feed back the association id is as a return
1363 * indication to the call. Error is always negative and association id is
1366 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1367 struct sockaddr __user *addrs,
1370 sctp_assoc_t assoc_id = 0;
1373 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1382 * New (hopefully final) interface for the API.
1383 * We use the sctp_getaddrs_old structure so that use-space library
1384 * can avoid any unnecessary allocations. The only defferent part
1385 * is that we store the actual length of the address buffer into the
1386 * addrs_num structure member. That way we can re-use the existing
1389 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1390 char __user *optval,
1393 struct sctp_getaddrs_old param;
1394 sctp_assoc_t assoc_id = 0;
1397 if (len < sizeof(param))
1400 if (copy_from_user(¶m, optval, sizeof(param)))
1403 err = __sctp_setsockopt_connectx(sk,
1404 (struct sockaddr __user *)param.addrs,
1405 param.addr_num, &assoc_id);
1407 if (err == 0 || err == -EINPROGRESS) {
1408 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1410 if (put_user(sizeof(assoc_id), optlen))
1417 /* API 3.1.4 close() - UDP Style Syntax
1418 * Applications use close() to perform graceful shutdown (as described in
1419 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1420 * by a UDP-style socket.
1424 * ret = close(int sd);
1426 * sd - the socket descriptor of the associations to be closed.
1428 * To gracefully shutdown a specific association represented by the
1429 * UDP-style socket, an application should use the sendmsg() call,
1430 * passing no user data, but including the appropriate flag in the
1431 * ancillary data (see Section xxxx).
1433 * If sd in the close() call is a branched-off socket representing only
1434 * one association, the shutdown is performed on that association only.
1436 * 4.1.6 close() - TCP Style Syntax
1438 * Applications use close() to gracefully close down an association.
1442 * int close(int sd);
1444 * sd - the socket descriptor of the association to be closed.
1446 * After an application calls close() on a socket descriptor, no further
1447 * socket operations will succeed on that descriptor.
1449 * API 7.1.4 SO_LINGER
1451 * An application using the TCP-style socket can use this option to
1452 * perform the SCTP ABORT primitive. The linger option structure is:
1455 * int l_onoff; // option on/off
1456 * int l_linger; // linger time
1459 * To enable the option, set l_onoff to 1. If the l_linger value is set
1460 * to 0, calling close() is the same as the ABORT primitive. If the
1461 * value is set to a negative value, the setsockopt() call will return
1462 * an error. If the value is set to a positive value linger_time, the
1463 * close() can be blocked for at most linger_time ms. If the graceful
1464 * shutdown phase does not finish during this period, close() will
1465 * return but the graceful shutdown phase continues in the system.
1467 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1469 struct net *net = sock_net(sk);
1470 struct sctp_endpoint *ep;
1471 struct sctp_association *asoc;
1472 struct list_head *pos, *temp;
1473 unsigned int data_was_unread;
1475 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1478 sk->sk_shutdown = SHUTDOWN_MASK;
1479 sk->sk_state = SCTP_SS_CLOSING;
1481 ep = sctp_sk(sk)->ep;
1483 /* Clean up any skbs sitting on the receive queue. */
1484 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1485 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1487 /* Walk all associations on an endpoint. */
1488 list_for_each_safe(pos, temp, &ep->asocs) {
1489 asoc = list_entry(pos, struct sctp_association, asocs);
1491 if (sctp_style(sk, TCP)) {
1492 /* A closed association can still be in the list if
1493 * it belongs to a TCP-style listening socket that is
1494 * not yet accepted. If so, free it. If not, send an
1495 * ABORT or SHUTDOWN based on the linger options.
1497 if (sctp_state(asoc, CLOSED)) {
1498 sctp_unhash_established(asoc);
1499 sctp_association_free(asoc);
1504 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1505 !skb_queue_empty(&asoc->ulpq.reasm) ||
1506 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1507 struct sctp_chunk *chunk;
1509 chunk = sctp_make_abort_user(asoc, NULL, 0);
1511 sctp_primitive_ABORT(net, asoc, chunk);
1513 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1516 /* On a TCP-style socket, block for at most linger_time if set. */
1517 if (sctp_style(sk, TCP) && timeout)
1518 sctp_wait_for_close(sk, timeout);
1520 /* This will run the backlog queue. */
1521 sctp_release_sock(sk);
1523 /* Supposedly, no process has access to the socket, but
1524 * the net layers still may.
1526 sctp_local_bh_disable();
1527 sctp_bh_lock_sock(sk);
1529 /* Hold the sock, since sk_common_release() will put sock_put()
1530 * and we have just a little more cleanup.
1533 sk_common_release(sk);
1535 sctp_bh_unlock_sock(sk);
1536 sctp_local_bh_enable();
1540 SCTP_DBG_OBJCNT_DEC(sock);
1543 /* Handle EPIPE error. */
1544 static int sctp_error(struct sock *sk, int flags, int err)
1547 err = sock_error(sk) ? : -EPIPE;
1548 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1549 send_sig(SIGPIPE, current, 0);
1553 /* API 3.1.3 sendmsg() - UDP Style Syntax
1555 * An application uses sendmsg() and recvmsg() calls to transmit data to
1556 * and receive data from its peer.
1558 * ssize_t sendmsg(int socket, const struct msghdr *message,
1561 * socket - the socket descriptor of the endpoint.
1562 * message - pointer to the msghdr structure which contains a single
1563 * user message and possibly some ancillary data.
1565 * See Section 5 for complete description of the data
1568 * flags - flags sent or received with the user message, see Section
1569 * 5 for complete description of the flags.
1571 * Note: This function could use a rewrite especially when explicit
1572 * connect support comes in.
1574 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1576 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1578 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1579 struct msghdr *msg, size_t msg_len)
1581 struct net *net = sock_net(sk);
1582 struct sctp_sock *sp;
1583 struct sctp_endpoint *ep;
1584 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1585 struct sctp_transport *transport, *chunk_tp;
1586 struct sctp_chunk *chunk;
1588 struct sockaddr *msg_name = NULL;
1589 struct sctp_sndrcvinfo default_sinfo;
1590 struct sctp_sndrcvinfo *sinfo;
1591 struct sctp_initmsg *sinit;
1592 sctp_assoc_t associd = 0;
1593 sctp_cmsgs_t cmsgs = { NULL };
1597 __u16 sinfo_flags = 0;
1598 struct sctp_datamsg *datamsg;
1599 int msg_flags = msg->msg_flags;
1601 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1608 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1610 /* We cannot send a message over a TCP-style listening socket. */
1611 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1616 /* Parse out the SCTP CMSGs. */
1617 err = sctp_msghdr_parse(msg, &cmsgs);
1620 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1624 /* Fetch the destination address for this packet. This
1625 * address only selects the association--it is not necessarily
1626 * the address we will send to.
1627 * For a peeled-off socket, msg_name is ignored.
1629 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1630 int msg_namelen = msg->msg_namelen;
1632 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1637 if (msg_namelen > sizeof(to))
1638 msg_namelen = sizeof(to);
1639 memcpy(&to, msg->msg_name, msg_namelen);
1640 msg_name = msg->msg_name;
1646 /* Did the user specify SNDRCVINFO? */
1648 sinfo_flags = sinfo->sinfo_flags;
1649 associd = sinfo->sinfo_assoc_id;
1652 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1653 msg_len, sinfo_flags);
1655 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1656 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1661 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1662 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1663 * If SCTP_ABORT is set, the message length could be non zero with
1664 * the msg_iov set to the user abort reason.
1666 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1667 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1672 /* If SCTP_ADDR_OVER is set, there must be an address
1673 * specified in msg_name.
1675 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1682 SCTP_DEBUG_PRINTK("About to look up association.\n");
1686 /* If a msg_name has been specified, assume this is to be used. */
1688 /* Look for a matching association on the endpoint. */
1689 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1691 /* If we could not find a matching association on the
1692 * endpoint, make sure that it is not a TCP-style
1693 * socket that already has an association or there is
1694 * no peeled-off association on another socket.
1696 if ((sctp_style(sk, TCP) &&
1697 sctp_sstate(sk, ESTABLISHED)) ||
1698 sctp_endpoint_is_peeled_off(ep, &to)) {
1699 err = -EADDRNOTAVAIL;
1704 asoc = sctp_id2assoc(sk, associd);
1712 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1714 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1715 * socket that has an association in CLOSED state. This can
1716 * happen when an accepted socket has an association that is
1719 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1724 if (sinfo_flags & SCTP_EOF) {
1725 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1727 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1731 if (sinfo_flags & SCTP_ABORT) {
1733 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1739 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1740 sctp_primitive_ABORT(net, asoc, chunk);
1746 /* Do we need to create the association? */
1748 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1750 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1755 /* Check for invalid stream against the stream counts,
1756 * either the default or the user specified stream counts.
1759 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1760 /* Check against the defaults. */
1761 if (sinfo->sinfo_stream >=
1762 sp->initmsg.sinit_num_ostreams) {
1767 /* Check against the requested. */
1768 if (sinfo->sinfo_stream >=
1769 sinit->sinit_num_ostreams) {
1777 * API 3.1.2 bind() - UDP Style Syntax
1778 * If a bind() or sctp_bindx() is not called prior to a
1779 * sendmsg() call that initiates a new association, the
1780 * system picks an ephemeral port and will choose an address
1781 * set equivalent to binding with a wildcard address.
1783 if (!ep->base.bind_addr.port) {
1784 if (sctp_autobind(sk)) {
1790 * If an unprivileged user inherits a one-to-many
1791 * style socket with open associations on a privileged
1792 * port, it MAY be permitted to accept new associations,
1793 * but it SHOULD NOT be permitted to open new
1796 if (ep->base.bind_addr.port < PROT_SOCK &&
1797 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1803 scope = sctp_scope(&to);
1804 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1810 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1816 /* If the SCTP_INIT ancillary data is specified, set all
1817 * the association init values accordingly.
1820 if (sinit->sinit_num_ostreams) {
1821 asoc->c.sinit_num_ostreams =
1822 sinit->sinit_num_ostreams;
1824 if (sinit->sinit_max_instreams) {
1825 asoc->c.sinit_max_instreams =
1826 sinit->sinit_max_instreams;
1828 if (sinit->sinit_max_attempts) {
1829 asoc->max_init_attempts
1830 = sinit->sinit_max_attempts;
1832 if (sinit->sinit_max_init_timeo) {
1833 asoc->max_init_timeo =
1834 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1838 /* Prime the peer's transport structures. */
1839 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1846 /* ASSERT: we have a valid association at this point. */
1847 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1850 /* If the user didn't specify SNDRCVINFO, make up one with
1853 memset(&default_sinfo, 0, sizeof(default_sinfo));
1854 default_sinfo.sinfo_stream = asoc->default_stream;
1855 default_sinfo.sinfo_flags = asoc->default_flags;
1856 default_sinfo.sinfo_ppid = asoc->default_ppid;
1857 default_sinfo.sinfo_context = asoc->default_context;
1858 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1859 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1860 sinfo = &default_sinfo;
1863 /* API 7.1.7, the sndbuf size per association bounds the
1864 * maximum size of data that can be sent in a single send call.
1866 if (msg_len > sk->sk_sndbuf) {
1871 if (asoc->pmtu_pending)
1872 sctp_assoc_pending_pmtu(sk, asoc);
1874 /* If fragmentation is disabled and the message length exceeds the
1875 * association fragmentation point, return EMSGSIZE. The I-D
1876 * does not specify what this error is, but this looks like
1879 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1884 /* Check for invalid stream. */
1885 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1890 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1891 if (!sctp_wspace(asoc)) {
1892 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1897 /* If an address is passed with the sendto/sendmsg call, it is used
1898 * to override the primary destination address in the TCP model, or
1899 * when SCTP_ADDR_OVER flag is set in the UDP model.
1901 if ((sctp_style(sk, TCP) && msg_name) ||
1902 (sinfo_flags & SCTP_ADDR_OVER)) {
1903 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1911 /* Auto-connect, if we aren't connected already. */
1912 if (sctp_state(asoc, CLOSED)) {
1913 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1916 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1919 /* Break the message into multiple chunks of maximum size. */
1920 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1921 if (IS_ERR(datamsg)) {
1922 err = PTR_ERR(datamsg);
1926 /* Now send the (possibly) fragmented message. */
1927 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1928 sctp_chunk_hold(chunk);
1930 /* Do accounting for the write space. */
1931 sctp_set_owner_w(chunk);
1933 chunk->transport = chunk_tp;
1936 /* Send it to the lower layers. Note: all chunks
1937 * must either fail or succeed. The lower layer
1938 * works that way today. Keep it that way or this
1941 err = sctp_primitive_SEND(net, asoc, datamsg);
1942 /* Did the lower layer accept the chunk? */
1944 sctp_datamsg_free(datamsg);
1946 sctp_datamsg_put(datamsg);
1948 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1955 /* If we are already past ASSOCIATE, the lower
1956 * layers are responsible for association cleanup.
1962 sctp_unhash_established(asoc);
1963 sctp_association_free(asoc);
1966 sctp_release_sock(sk);
1969 return sctp_error(sk, msg_flags, err);
1976 err = sock_error(sk);
1986 /* This is an extended version of skb_pull() that removes the data from the
1987 * start of a skb even when data is spread across the list of skb's in the
1988 * frag_list. len specifies the total amount of data that needs to be removed.
1989 * when 'len' bytes could be removed from the skb, it returns 0.
1990 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1991 * could not be removed.
1993 static int sctp_skb_pull(struct sk_buff *skb, int len)
1995 struct sk_buff *list;
1996 int skb_len = skb_headlen(skb);
1999 if (len <= skb_len) {
2000 __skb_pull(skb, len);
2004 __skb_pull(skb, skb_len);
2006 skb_walk_frags(skb, list) {
2007 rlen = sctp_skb_pull(list, len);
2008 skb->len -= (len-rlen);
2009 skb->data_len -= (len-rlen);
2020 /* API 3.1.3 recvmsg() - UDP Style Syntax
2022 * ssize_t recvmsg(int socket, struct msghdr *message,
2025 * socket - the socket descriptor of the endpoint.
2026 * message - pointer to the msghdr structure which contains a single
2027 * user message and possibly some ancillary data.
2029 * See Section 5 for complete description of the data
2032 * flags - flags sent or received with the user message, see Section
2033 * 5 for complete description of the flags.
2035 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2037 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2038 struct msghdr *msg, size_t len, int noblock,
2039 int flags, int *addr_len)
2041 struct sctp_ulpevent *event = NULL;
2042 struct sctp_sock *sp = sctp_sk(sk);
2043 struct sk_buff *skb;
2048 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2049 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2050 "len", len, "knoblauch", noblock,
2051 "flags", flags, "addr_len", addr_len);
2055 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2060 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2064 /* Get the total length of the skb including any skb's in the
2073 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2075 event = sctp_skb2event(skb);
2080 sock_recv_ts_and_drops(msg, sk, 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(skb, msg->msg_name, addr_len);
2088 /* Check if we allow SCTP_SNDRCVINFO. */
2089 if (sp->subscribe.sctp_data_io_event)
2090 sctp_ulpevent_read_sndrcvinfo(event, msg);
2092 /* FIXME: we should be calling IP/IPv6 layers. */
2093 if (sk->sk_protinfo.af_inet.cmsg_flags)
2094 ip_cmsg_recv(msg, skb);
2099 /* If skb's length exceeds the user's buffer, update the skb and
2100 * push it back to the receive_queue so that the next call to
2101 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2103 if (skb_len > copied) {
2104 msg->msg_flags &= ~MSG_EOR;
2105 if (flags & MSG_PEEK)
2107 sctp_skb_pull(skb, copied);
2108 skb_queue_head(&sk->sk_receive_queue, skb);
2110 /* When only partial message is copied to the user, increase
2111 * rwnd by that amount. If all the data in the skb is read,
2112 * rwnd is updated when the event is freed.
2114 if (!sctp_ulpevent_is_notification(event))
2115 sctp_assoc_rwnd_increase(event->asoc, copied);
2117 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2118 (event->msg_flags & MSG_EOR))
2119 msg->msg_flags |= MSG_EOR;
2121 msg->msg_flags &= ~MSG_EOR;
2124 if (flags & MSG_PEEK) {
2125 /* Release the skb reference acquired after peeking the skb in
2126 * sctp_skb_recv_datagram().
2130 /* Free the event which includes releasing the reference to
2131 * the owner of the skb, freeing the skb and updating the
2134 sctp_ulpevent_free(event);
2137 sctp_release_sock(sk);
2141 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2143 * This option is a on/off flag. If enabled no SCTP message
2144 * fragmentation will be performed. Instead if a message being sent
2145 * exceeds the current PMTU size, the message will NOT be sent and
2146 * instead a error will be indicated to the user.
2148 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2149 char __user *optval,
2150 unsigned int optlen)
2154 if (optlen < sizeof(int))
2157 if (get_user(val, (int __user *)optval))
2160 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2165 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2166 unsigned int optlen)
2168 struct sctp_association *asoc;
2169 struct sctp_ulpevent *event;
2171 if (optlen > sizeof(struct sctp_event_subscribe))
2173 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,
2191 sctp_ulpq_tail_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);
2214 /* Applicable to UDP-style socket only */
2215 if (sctp_style(sk, TCP))
2217 if (optlen != sizeof(int))
2219 if (copy_from_user(&sp->autoclose, optval, optlen))
2225 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2227 * Applications can enable or disable heartbeats for any peer address of
2228 * an association, modify an address's heartbeat interval, force a
2229 * heartbeat to be sent immediately, and adjust the address's maximum
2230 * number of retransmissions sent before an address is considered
2231 * unreachable. The following structure is used to access and modify an
2232 * address's parameters:
2234 * struct sctp_paddrparams {
2235 * sctp_assoc_t spp_assoc_id;
2236 * struct sockaddr_storage spp_address;
2237 * uint32_t spp_hbinterval;
2238 * uint16_t spp_pathmaxrxt;
2239 * uint32_t spp_pathmtu;
2240 * uint32_t spp_sackdelay;
2241 * uint32_t spp_flags;
2244 * spp_assoc_id - (one-to-many style socket) This is filled in the
2245 * application, and identifies the association for
2247 * spp_address - This specifies which address is of interest.
2248 * spp_hbinterval - This contains the value of the heartbeat interval,
2249 * in milliseconds. If a value of zero
2250 * is present in this field then no changes are to
2251 * be made to this parameter.
2252 * spp_pathmaxrxt - This contains the maximum number of
2253 * retransmissions before this address shall be
2254 * considered unreachable. If a value of zero
2255 * is present in this field then no changes are to
2256 * be made to this parameter.
2257 * spp_pathmtu - When Path MTU discovery is disabled the value
2258 * specified here will be the "fixed" path mtu.
2259 * Note that if the spp_address field is empty
2260 * then all associations on this address will
2261 * have this fixed path mtu set upon them.
2263 * spp_sackdelay - When delayed sack is enabled, this value specifies
2264 * the number of milliseconds that sacks will be delayed
2265 * for. This value will apply to all addresses of an
2266 * association if the spp_address field is empty. Note
2267 * also, that if delayed sack is enabled and this
2268 * value is set to 0, no change is made to the last
2269 * recorded delayed sack timer value.
2271 * spp_flags - These flags are used to control various features
2272 * on an association. The flag field may contain
2273 * zero or more of the following options.
2275 * SPP_HB_ENABLE - Enable heartbeats on the
2276 * specified address. Note that if the address
2277 * field is empty all addresses for the association
2278 * have heartbeats enabled upon them.
2280 * SPP_HB_DISABLE - Disable heartbeats on the
2281 * speicifed address. Note that if the address
2282 * field is empty all addresses for the association
2283 * will have their heartbeats disabled. Note also
2284 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2285 * mutually exclusive, only one of these two should
2286 * be specified. Enabling both fields will have
2287 * undetermined results.
2289 * SPP_HB_DEMAND - Request a user initiated heartbeat
2290 * to be made immediately.
2292 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2293 * heartbeat delayis to be set to the value of 0
2296 * SPP_PMTUD_ENABLE - This field will enable PMTU
2297 * discovery upon the specified address. Note that
2298 * if the address feild is empty then all addresses
2299 * on the association are effected.
2301 * SPP_PMTUD_DISABLE - This field will disable PMTU
2302 * discovery upon the specified address. Note that
2303 * if the address feild is empty then all addresses
2304 * on the association are effected. Not also that
2305 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2306 * exclusive. Enabling both will have undetermined
2309 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2310 * on delayed sack. The time specified in spp_sackdelay
2311 * is used to specify the sack delay for this address. Note
2312 * that if spp_address is empty then all addresses will
2313 * enable delayed sack and take on the sack delay
2314 * value specified in spp_sackdelay.
2315 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2316 * off delayed sack. If the spp_address field is blank then
2317 * delayed sack is disabled for the entire association. Note
2318 * also that this field is mutually exclusive to
2319 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2322 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2323 struct sctp_transport *trans,
2324 struct sctp_association *asoc,
2325 struct sctp_sock *sp,
2328 int sackdelay_change)
2332 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2333 struct net *net = sock_net(trans->asoc->base.sk);
2335 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2340 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2341 * this field is ignored. Note also that a value of zero indicates
2342 * the current setting should be left unchanged.
2344 if (params->spp_flags & SPP_HB_ENABLE) {
2346 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2347 * set. This lets us use 0 value when this flag
2350 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2351 params->spp_hbinterval = 0;
2353 if (params->spp_hbinterval ||
2354 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2357 msecs_to_jiffies(params->spp_hbinterval);
2360 msecs_to_jiffies(params->spp_hbinterval);
2362 sp->hbinterval = params->spp_hbinterval;
2369 trans->param_flags =
2370 (trans->param_flags & ~SPP_HB) | hb_change;
2373 (asoc->param_flags & ~SPP_HB) | hb_change;
2376 (sp->param_flags & ~SPP_HB) | hb_change;
2380 /* When Path MTU discovery is disabled the value specified here will
2381 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2382 * include the flag SPP_PMTUD_DISABLE for this field to have any
2385 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2387 trans->pathmtu = params->spp_pathmtu;
2388 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2390 asoc->pathmtu = params->spp_pathmtu;
2391 sctp_frag_point(asoc, params->spp_pathmtu);
2393 sp->pathmtu = params->spp_pathmtu;
2399 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2400 (params->spp_flags & SPP_PMTUD_ENABLE);
2401 trans->param_flags =
2402 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2404 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2405 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2409 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2412 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2416 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2417 * value of this field is ignored. Note also that a value of zero
2418 * indicates the current setting should be left unchanged.
2420 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2423 msecs_to_jiffies(params->spp_sackdelay);
2426 msecs_to_jiffies(params->spp_sackdelay);
2428 sp->sackdelay = params->spp_sackdelay;
2432 if (sackdelay_change) {
2434 trans->param_flags =
2435 (trans->param_flags & ~SPP_SACKDELAY) |
2439 (asoc->param_flags & ~SPP_SACKDELAY) |
2443 (sp->param_flags & ~SPP_SACKDELAY) |
2448 /* Note that a value of zero indicates the current setting should be
2451 if (params->spp_pathmaxrxt) {
2453 trans->pathmaxrxt = params->spp_pathmaxrxt;
2455 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2457 sp->pathmaxrxt = params->spp_pathmaxrxt;
2464 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2465 char __user *optval,
2466 unsigned int optlen)
2468 struct sctp_paddrparams params;
2469 struct sctp_transport *trans = NULL;
2470 struct sctp_association *asoc = NULL;
2471 struct sctp_sock *sp = sctp_sk(sk);
2473 int hb_change, pmtud_change, sackdelay_change;
2475 if (optlen != sizeof(struct sctp_paddrparams))
2478 if (copy_from_user(¶ms, optval, optlen))
2481 /* Validate flags and value parameters. */
2482 hb_change = params.spp_flags & SPP_HB;
2483 pmtud_change = params.spp_flags & SPP_PMTUD;
2484 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2486 if (hb_change == SPP_HB ||
2487 pmtud_change == SPP_PMTUD ||
2488 sackdelay_change == SPP_SACKDELAY ||
2489 params.spp_sackdelay > 500 ||
2490 (params.spp_pathmtu &&
2491 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2494 /* If an address other than INADDR_ANY is specified, and
2495 * no transport is found, then the request is invalid.
2497 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2498 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2499 params.spp_assoc_id);
2504 /* Get association, if assoc_id != 0 and the socket is a one
2505 * to many style socket, and an association was not found, then
2506 * the id was invalid.
2508 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2509 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2512 /* Heartbeat demand can only be sent on a transport or
2513 * association, but not a socket.
2515 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2518 /* Process parameters. */
2519 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2520 hb_change, pmtud_change,
2526 /* If changes are for association, also apply parameters to each
2529 if (!trans && asoc) {
2530 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2532 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2533 hb_change, pmtud_change,
2542 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2544 * This option will effect the way delayed acks are performed. This
2545 * option allows you to get or set the delayed ack time, in
2546 * milliseconds. It also allows changing the delayed ack frequency.
2547 * Changing the frequency to 1 disables the delayed sack algorithm. If
2548 * the assoc_id is 0, then this sets or gets the endpoints default
2549 * values. If the assoc_id field is non-zero, then the set or get
2550 * effects the specified association for the one to many model (the
2551 * assoc_id field is ignored by the one to one model). Note that if
2552 * sack_delay or sack_freq are 0 when setting this option, then the
2553 * current values will remain unchanged.
2555 * struct sctp_sack_info {
2556 * sctp_assoc_t sack_assoc_id;
2557 * uint32_t sack_delay;
2558 * uint32_t sack_freq;
2561 * sack_assoc_id - This parameter, indicates which association the user
2562 * is performing an action upon. Note that if this field's value is
2563 * zero then the endpoints default value is changed (effecting future
2564 * associations only).
2566 * sack_delay - This parameter contains the number of milliseconds that
2567 * the user is requesting the delayed ACK timer be set to. Note that
2568 * this value is defined in the standard to be between 200 and 500
2571 * sack_freq - This parameter contains the number of packets that must
2572 * be received before a sack is sent without waiting for the delay
2573 * timer to expire. The default value for this is 2, setting this
2574 * value to 1 will disable the delayed sack algorithm.
2577 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2578 char __user *optval, unsigned int optlen)
2580 struct sctp_sack_info params;
2581 struct sctp_transport *trans = NULL;
2582 struct sctp_association *asoc = NULL;
2583 struct sctp_sock *sp = sctp_sk(sk);
2585 if (optlen == sizeof(struct sctp_sack_info)) {
2586 if (copy_from_user(¶ms, optval, optlen))
2589 if (params.sack_delay == 0 && params.sack_freq == 0)
2591 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2592 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2593 pr_warn("Use struct sctp_sack_info instead\n");
2594 if (copy_from_user(¶ms, optval, optlen))
2597 if (params.sack_delay == 0)
2598 params.sack_freq = 1;
2600 params.sack_freq = 0;
2604 /* Validate value parameter. */
2605 if (params.sack_delay > 500)
2608 /* Get association, if sack_assoc_id != 0 and the socket is a one
2609 * to many style socket, and an association was not found, then
2610 * the id was invalid.
2612 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2613 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2616 if (params.sack_delay) {
2619 msecs_to_jiffies(params.sack_delay);
2621 (asoc->param_flags & ~SPP_SACKDELAY) |
2622 SPP_SACKDELAY_ENABLE;
2624 sp->sackdelay = params.sack_delay;
2626 (sp->param_flags & ~SPP_SACKDELAY) |
2627 SPP_SACKDELAY_ENABLE;
2631 if (params.sack_freq == 1) {
2634 (asoc->param_flags & ~SPP_SACKDELAY) |
2635 SPP_SACKDELAY_DISABLE;
2638 (sp->param_flags & ~SPP_SACKDELAY) |
2639 SPP_SACKDELAY_DISABLE;
2641 } else if (params.sack_freq > 1) {
2643 asoc->sackfreq = params.sack_freq;
2645 (asoc->param_flags & ~SPP_SACKDELAY) |
2646 SPP_SACKDELAY_ENABLE;
2648 sp->sackfreq = params.sack_freq;
2650 (sp->param_flags & ~SPP_SACKDELAY) |
2651 SPP_SACKDELAY_ENABLE;
2655 /* If change is for association, also apply to each transport. */
2657 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2659 if (params.sack_delay) {
2661 msecs_to_jiffies(params.sack_delay);
2662 trans->param_flags =
2663 (trans->param_flags & ~SPP_SACKDELAY) |
2664 SPP_SACKDELAY_ENABLE;
2666 if (params.sack_freq == 1) {
2667 trans->param_flags =
2668 (trans->param_flags & ~SPP_SACKDELAY) |
2669 SPP_SACKDELAY_DISABLE;
2670 } else if (params.sack_freq > 1) {
2671 trans->sackfreq = params.sack_freq;
2672 trans->param_flags =
2673 (trans->param_flags & ~SPP_SACKDELAY) |
2674 SPP_SACKDELAY_ENABLE;
2682 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2684 * Applications can specify protocol parameters for the default association
2685 * initialization. The option name argument to setsockopt() and getsockopt()
2688 * Setting initialization parameters is effective only on an unconnected
2689 * socket (for UDP-style sockets only future associations are effected
2690 * by the change). With TCP-style sockets, this option is inherited by
2691 * sockets derived from a listener socket.
2693 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2695 struct sctp_initmsg sinit;
2696 struct sctp_sock *sp = sctp_sk(sk);
2698 if (optlen != sizeof(struct sctp_initmsg))
2700 if (copy_from_user(&sinit, optval, optlen))
2703 if (sinit.sinit_num_ostreams)
2704 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2705 if (sinit.sinit_max_instreams)
2706 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2707 if (sinit.sinit_max_attempts)
2708 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2709 if (sinit.sinit_max_init_timeo)
2710 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2716 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2718 * Applications that wish to use the sendto() system call may wish to
2719 * specify a default set of parameters that would normally be supplied
2720 * through the inclusion of ancillary data. This socket option allows
2721 * such an application to set the default sctp_sndrcvinfo structure.
2722 * The application that wishes to use this socket option simply passes
2723 * in to this call the sctp_sndrcvinfo structure defined in Section
2724 * 5.2.2) The input parameters accepted by this call include
2725 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2726 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2727 * to this call if the caller is using the UDP model.
2729 static int sctp_setsockopt_default_send_param(struct sock *sk,
2730 char __user *optval,
2731 unsigned int optlen)
2733 struct sctp_sndrcvinfo info;
2734 struct sctp_association *asoc;
2735 struct sctp_sock *sp = sctp_sk(sk);
2737 if (optlen != sizeof(struct sctp_sndrcvinfo))
2739 if (copy_from_user(&info, optval, optlen))
2742 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2743 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2747 asoc->default_stream = info.sinfo_stream;
2748 asoc->default_flags = info.sinfo_flags;
2749 asoc->default_ppid = info.sinfo_ppid;
2750 asoc->default_context = info.sinfo_context;
2751 asoc->default_timetolive = info.sinfo_timetolive;
2753 sp->default_stream = info.sinfo_stream;
2754 sp->default_flags = info.sinfo_flags;
2755 sp->default_ppid = info.sinfo_ppid;
2756 sp->default_context = info.sinfo_context;
2757 sp->default_timetolive = info.sinfo_timetolive;
2763 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2765 * Requests that the local SCTP stack use the enclosed peer address as
2766 * the association primary. The enclosed address must be one of the
2767 * association peer's addresses.
2769 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2770 unsigned int optlen)
2772 struct sctp_prim prim;
2773 struct sctp_transport *trans;
2775 if (optlen != sizeof(struct sctp_prim))
2778 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2781 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2785 sctp_assoc_set_primary(trans->asoc, trans);
2791 * 7.1.5 SCTP_NODELAY
2793 * Turn on/off any Nagle-like algorithm. This means that packets are
2794 * generally sent as soon as possible and no unnecessary delays are
2795 * introduced, at the cost of more packets in the network. Expects an
2796 * integer boolean flag.
2798 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2799 unsigned int optlen)
2803 if (optlen < sizeof(int))
2805 if (get_user(val, (int __user *)optval))
2808 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2814 * 7.1.1 SCTP_RTOINFO
2816 * The protocol parameters used to initialize and bound retransmission
2817 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2818 * and modify these parameters.
2819 * All parameters are time values, in milliseconds. A value of 0, when
2820 * modifying the parameters, indicates that the current value should not
2824 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2826 struct sctp_rtoinfo rtoinfo;
2827 struct sctp_association *asoc;
2829 if (optlen != sizeof (struct sctp_rtoinfo))
2832 if (copy_from_user(&rtoinfo, optval, optlen))
2835 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2837 /* Set the values to the specific association */
2838 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2842 if (rtoinfo.srto_initial != 0)
2844 msecs_to_jiffies(rtoinfo.srto_initial);
2845 if (rtoinfo.srto_max != 0)
2846 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2847 if (rtoinfo.srto_min != 0)
2848 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2850 /* If there is no association or the association-id = 0
2851 * set the values to the endpoint.
2853 struct sctp_sock *sp = sctp_sk(sk);
2855 if (rtoinfo.srto_initial != 0)
2856 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2857 if (rtoinfo.srto_max != 0)
2858 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2859 if (rtoinfo.srto_min != 0)
2860 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2868 * 7.1.2 SCTP_ASSOCINFO
2870 * This option is used to tune the maximum retransmission attempts
2871 * of the association.
2872 * Returns an error if the new association retransmission value is
2873 * greater than the sum of the retransmission value of the peer.
2874 * See [SCTP] for more information.
2877 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2880 struct sctp_assocparams assocparams;
2881 struct sctp_association *asoc;
2883 if (optlen != sizeof(struct sctp_assocparams))
2885 if (copy_from_user(&assocparams, optval, optlen))
2888 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2890 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2893 /* Set the values to the specific association */
2895 if (assocparams.sasoc_asocmaxrxt != 0) {
2898 struct sctp_transport *peer_addr;
2900 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2902 path_sum += peer_addr->pathmaxrxt;
2906 /* Only validate asocmaxrxt if we have more than
2907 * one path/transport. We do this because path
2908 * retransmissions are only counted when we have more
2912 assocparams.sasoc_asocmaxrxt > path_sum)
2915 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2918 if (assocparams.sasoc_cookie_life != 0) {
2919 asoc->cookie_life.tv_sec =
2920 assocparams.sasoc_cookie_life / 1000;
2921 asoc->cookie_life.tv_usec =
2922 (assocparams.sasoc_cookie_life % 1000)
2926 /* Set the values to the endpoint */
2927 struct sctp_sock *sp = sctp_sk(sk);
2929 if (assocparams.sasoc_asocmaxrxt != 0)
2930 sp->assocparams.sasoc_asocmaxrxt =
2931 assocparams.sasoc_asocmaxrxt;
2932 if (assocparams.sasoc_cookie_life != 0)
2933 sp->assocparams.sasoc_cookie_life =
2934 assocparams.sasoc_cookie_life;
2940 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2942 * This socket option is a boolean flag which turns on or off mapped V4
2943 * addresses. If this option is turned on and the socket is type
2944 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2945 * If this option is turned off, then no mapping will be done of V4
2946 * addresses and a user will receive both PF_INET6 and PF_INET type
2947 * addresses on the socket.
2949 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2952 struct sctp_sock *sp = sctp_sk(sk);
2954 if (optlen < sizeof(int))
2956 if (get_user(val, (int __user *)optval))
2967 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2968 * This option will get or set the maximum size to put in any outgoing
2969 * SCTP DATA chunk. If a message is larger than this size it will be
2970 * fragmented by SCTP into the specified size. Note that the underlying
2971 * SCTP implementation may fragment into smaller sized chunks when the
2972 * PMTU of the underlying association is smaller than the value set by
2973 * the user. The default value for this option is '0' which indicates
2974 * the user is NOT limiting fragmentation and only the PMTU will effect
2975 * SCTP's choice of DATA chunk size. Note also that values set larger
2976 * than the maximum size of an IP datagram will effectively let SCTP
2977 * control fragmentation (i.e. the same as setting this option to 0).
2979 * The following structure is used to access and modify this parameter:
2981 * struct sctp_assoc_value {
2982 * sctp_assoc_t assoc_id;
2983 * uint32_t assoc_value;
2986 * assoc_id: This parameter is ignored for one-to-one style sockets.
2987 * For one-to-many style sockets this parameter indicates which
2988 * association the user is performing an action upon. Note that if
2989 * this field's value is zero then the endpoints default value is
2990 * changed (effecting future associations only).
2991 * assoc_value: This parameter specifies the maximum size in bytes.
2993 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2995 struct sctp_assoc_value params;
2996 struct sctp_association *asoc;
2997 struct sctp_sock *sp = sctp_sk(sk);
3000 if (optlen == sizeof(int)) {
3001 pr_warn("Use of int in maxseg socket option deprecated\n");
3002 pr_warn("Use struct sctp_assoc_value instead\n");
3003 if (copy_from_user(&val, optval, optlen))
3005 params.assoc_id = 0;
3006 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3007 if (copy_from_user(¶ms, optval, optlen))
3009 val = params.assoc_value;
3013 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3016 asoc = sctp_id2assoc(sk, params.assoc_id);
3017 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3022 val = asoc->pathmtu;
3023 val -= sp->pf->af->net_header_len;
3024 val -= sizeof(struct sctphdr) +
3025 sizeof(struct sctp_data_chunk);
3027 asoc->user_frag = val;
3028 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3030 sp->user_frag = val;
3038 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3040 * Requests that the peer mark the enclosed address as the association
3041 * primary. The enclosed address must be one of the association's
3042 * locally bound addresses. The following structure is used to make a
3043 * set primary request:
3045 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3046 unsigned int optlen)
3048 struct net *net = sock_net(sk);
3049 struct sctp_sock *sp;
3050 struct sctp_association *asoc = NULL;
3051 struct sctp_setpeerprim prim;
3052 struct sctp_chunk *chunk;
3058 if (!net->sctp.addip_enable)
3061 if (optlen != sizeof(struct sctp_setpeerprim))
3064 if (copy_from_user(&prim, optval, optlen))
3067 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3071 if (!asoc->peer.asconf_capable)
3074 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3077 if (!sctp_state(asoc, ESTABLISHED))
3080 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3084 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3085 return -EADDRNOTAVAIL;
3087 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3088 return -EADDRNOTAVAIL;
3090 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3091 chunk = sctp_make_asconf_set_prim(asoc,
3092 (union sctp_addr *)&prim.sspp_addr);
3096 err = sctp_send_asconf(asoc, chunk);
3098 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3103 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3104 unsigned int optlen)
3106 struct sctp_setadaptation adaptation;
3108 if (optlen != sizeof(struct sctp_setadaptation))
3110 if (copy_from_user(&adaptation, optval, optlen))
3113 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3119 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3121 * The context field in the sctp_sndrcvinfo structure is normally only
3122 * used when a failed message is retrieved holding the value that was
3123 * sent down on the actual send call. This option allows the setting of
3124 * a default context on an association basis that will be received on
3125 * reading messages from the peer. This is especially helpful in the
3126 * one-2-many model for an application to keep some reference to an
3127 * internal state machine that is processing messages on the
3128 * association. Note that the setting of this value only effects
3129 * received messages from the peer and does not effect the value that is
3130 * saved with outbound messages.
3132 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3133 unsigned int optlen)
3135 struct sctp_assoc_value params;
3136 struct sctp_sock *sp;
3137 struct sctp_association *asoc;
3139 if (optlen != sizeof(struct sctp_assoc_value))
3141 if (copy_from_user(¶ms, optval, optlen))
3146 if (params.assoc_id != 0) {
3147 asoc = sctp_id2assoc(sk, params.assoc_id);
3150 asoc->default_rcv_context = params.assoc_value;
3152 sp->default_rcv_context = params.assoc_value;
3159 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3161 * This options will at a minimum specify if the implementation is doing
3162 * fragmented interleave. Fragmented interleave, for a one to many
3163 * socket, is when subsequent calls to receive a message may return
3164 * parts of messages from different associations. Some implementations
3165 * may allow you to turn this value on or off. If so, when turned off,
3166 * no fragment interleave will occur (which will cause a head of line
3167 * blocking amongst multiple associations sharing the same one to many
3168 * socket). When this option is turned on, then each receive call may
3169 * come from a different association (thus the user must receive data
3170 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3171 * association each receive belongs to.
3173 * This option takes a boolean value. A non-zero value indicates that
3174 * fragmented interleave is on. A value of zero indicates that
3175 * fragmented interleave is off.
3177 * Note that it is important that an implementation that allows this
3178 * option to be turned on, have it off by default. Otherwise an unaware
3179 * application using the one to many model may become confused and act
3182 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3183 char __user *optval,
3184 unsigned int optlen)
3188 if (optlen != sizeof(int))
3190 if (get_user(val, (int __user *)optval))
3193 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3199 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3200 * (SCTP_PARTIAL_DELIVERY_POINT)
3202 * This option will set or get the SCTP partial delivery point. This
3203 * point is the size of a message where the partial delivery API will be
3204 * invoked to help free up rwnd space for the peer. Setting this to a
3205 * lower value will cause partial deliveries to happen more often. The
3206 * calls argument is an integer that sets or gets the partial delivery
3207 * point. Note also that the call will fail if the user attempts to set
3208 * this value larger than the socket receive buffer size.
3210 * Note that any single message having a length smaller than or equal to
3211 * the SCTP partial delivery point will be delivered in one single read
3212 * call as long as the user provided buffer is large enough to hold the
3215 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3216 char __user *optval,
3217 unsigned int optlen)
3221 if (optlen != sizeof(u32))
3223 if (get_user(val, (int __user *)optval))
3226 /* Note: We double the receive buffer from what the user sets
3227 * it to be, also initial rwnd is based on rcvbuf/2.
3229 if (val > (sk->sk_rcvbuf >> 1))
3232 sctp_sk(sk)->pd_point = val;
3234 return 0; /* is this the right error code? */
3238 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3240 * This option will allow a user to change the maximum burst of packets
3241 * that can be emitted by this association. Note that the default value
3242 * is 4, and some implementations may restrict this setting so that it
3243 * can only be lowered.
3245 * NOTE: This text doesn't seem right. Do this on a socket basis with
3246 * future associations inheriting the socket value.
3248 static int sctp_setsockopt_maxburst(struct sock *sk,
3249 char __user *optval,
3250 unsigned int optlen)
3252 struct sctp_assoc_value params;
3253 struct sctp_sock *sp;
3254 struct sctp_association *asoc;
3258 if (optlen == sizeof(int)) {
3259 pr_warn("Use of int in max_burst socket option deprecated\n");
3260 pr_warn("Use struct sctp_assoc_value instead\n");
3261 if (copy_from_user(&val, optval, optlen))
3263 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3264 if (copy_from_user(¶ms, optval, optlen))
3266 val = params.assoc_value;
3267 assoc_id = params.assoc_id;
3273 if (assoc_id != 0) {
3274 asoc = sctp_id2assoc(sk, assoc_id);
3277 asoc->max_burst = val;
3279 sp->max_burst = val;
3285 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3287 * This set option adds a chunk type that the user is requesting to be
3288 * received only in an authenticated way. Changes to the list of chunks
3289 * will only effect future associations on the socket.
3291 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3292 char __user *optval,
3293 unsigned int optlen)
3295 struct net *net = sock_net(sk);
3296 struct sctp_authchunk val;
3298 if (!net->sctp.auth_enable)
3301 if (optlen != sizeof(struct sctp_authchunk))
3303 if (copy_from_user(&val, optval, optlen))
3306 switch (val.sauth_chunk) {
3308 case SCTP_CID_INIT_ACK:
3309 case SCTP_CID_SHUTDOWN_COMPLETE:
3314 /* add this chunk id to the endpoint */
3315 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3319 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3321 * This option gets or sets the list of HMAC algorithms that the local
3322 * endpoint requires the peer to use.
3324 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3325 char __user *optval,
3326 unsigned int optlen)
3328 struct net *net = sock_net(sk);
3329 struct sctp_hmacalgo *hmacs;
3333 if (!net->sctp.auth_enable)
3336 if (optlen < sizeof(struct sctp_hmacalgo))
3339 hmacs= memdup_user(optval, optlen);
3341 return PTR_ERR(hmacs);
3343 idents = hmacs->shmac_num_idents;
3344 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3345 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3350 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3357 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3359 * This option will set a shared secret key which is used to build an
3360 * association shared key.
3362 static int sctp_setsockopt_auth_key(struct sock *sk,
3363 char __user *optval,
3364 unsigned int optlen)
3366 struct net *net = sock_net(sk);
3367 struct sctp_authkey *authkey;
3368 struct sctp_association *asoc;
3371 if (!net->sctp.auth_enable)
3374 if (optlen <= sizeof(struct sctp_authkey))
3377 authkey= memdup_user(optval, optlen);
3378 if (IS_ERR(authkey))
3379 return PTR_ERR(authkey);
3381 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3386 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3387 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3392 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3399 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3401 * This option will get or set the active shared key to be used to build
3402 * the association shared key.
3404 static int sctp_setsockopt_active_key(struct sock *sk,
3405 char __user *optval,
3406 unsigned int optlen)
3408 struct net *net = sock_net(sk);
3409 struct sctp_authkeyid val;
3410 struct sctp_association *asoc;
3412 if (!net->sctp.auth_enable)
3415 if (optlen != sizeof(struct sctp_authkeyid))
3417 if (copy_from_user(&val, optval, optlen))
3420 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3421 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3424 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3425 val.scact_keynumber);
3429 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3431 * This set option will delete a shared secret key from use.
3433 static int sctp_setsockopt_del_key(struct sock *sk,
3434 char __user *optval,
3435 unsigned int optlen)
3437 struct net *net = sock_net(sk);
3438 struct sctp_authkeyid val;
3439 struct sctp_association *asoc;
3441 if (!net->sctp.auth_enable)
3444 if (optlen != sizeof(struct sctp_authkeyid))
3446 if (copy_from_user(&val, optval, optlen))
3449 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3450 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3453 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3454 val.scact_keynumber);
3459 * 8.1.23 SCTP_AUTO_ASCONF
3461 * This option will enable or disable the use of the automatic generation of
3462 * ASCONF chunks to add and delete addresses to an existing association. Note
3463 * that this option has two caveats namely: a) it only affects sockets that
3464 * are bound to all addresses available to the SCTP stack, and b) the system
3465 * administrator may have an overriding control that turns the ASCONF feature
3466 * off no matter what setting the socket option may have.
3467 * This option expects an integer boolean flag, where a non-zero value turns on
3468 * the option, and a zero value turns off the option.
3469 * Note. In this implementation, socket operation overrides default parameter
3470 * being set by sysctl as well as FreeBSD implementation
3472 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3473 unsigned int optlen)
3476 struct sctp_sock *sp = sctp_sk(sk);
3478 if (optlen < sizeof(int))
3480 if (get_user(val, (int __user *)optval))
3482 if (!sctp_is_ep_boundall(sk) && val)
3484 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3487 if (val == 0 && sp->do_auto_asconf) {
3488 list_del(&sp->auto_asconf_list);
3489 sp->do_auto_asconf = 0;
3490 } else if (val && !sp->do_auto_asconf) {
3491 list_add_tail(&sp->auto_asconf_list,
3492 &sock_net(sk)->sctp.auto_asconf_splist);
3493 sp->do_auto_asconf = 1;
3500 * SCTP_PEER_ADDR_THLDS
3502 * This option allows us to alter the partially failed threshold for one or all
3503 * transports in an association. See Section 6.1 of:
3504 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3506 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3507 char __user *optval,
3508 unsigned int optlen)
3510 struct sctp_paddrthlds val;
3511 struct sctp_transport *trans;
3512 struct sctp_association *asoc;
3514 if (optlen < sizeof(struct sctp_paddrthlds))
3516 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3517 sizeof(struct sctp_paddrthlds)))
3521 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3522 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3525 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3527 if (val.spt_pathmaxrxt)
3528 trans->pathmaxrxt = val.spt_pathmaxrxt;
3529 trans->pf_retrans = val.spt_pathpfthld;
3532 if (val.spt_pathmaxrxt)
3533 asoc->pathmaxrxt = val.spt_pathmaxrxt;
3534 asoc->pf_retrans = val.spt_pathpfthld;
3536 trans = sctp_addr_id2transport(sk, &val.spt_address,
3541 if (val.spt_pathmaxrxt)
3542 trans->pathmaxrxt = val.spt_pathmaxrxt;
3543 trans->pf_retrans = val.spt_pathpfthld;
3549 /* API 6.2 setsockopt(), getsockopt()
3551 * Applications use setsockopt() and getsockopt() to set or retrieve
3552 * socket options. Socket options are used to change the default
3553 * behavior of sockets calls. They are described in Section 7.
3557 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3558 * int __user *optlen);
3559 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3562 * sd - the socket descript.
3563 * level - set to IPPROTO_SCTP for all SCTP options.
3564 * optname - the option name.
3565 * optval - the buffer to store the value of the option.
3566 * optlen - the size of the buffer.
3568 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3569 char __user *optval, unsigned int optlen)
3573 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3576 /* I can hardly begin to describe how wrong this is. This is
3577 * so broken as to be worse than useless. The API draft
3578 * REALLY is NOT helpful here... I am not convinced that the
3579 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3580 * are at all well-founded.
3582 if (level != SOL_SCTP) {
3583 struct sctp_af *af = sctp_sk(sk)->pf->af;
3584 retval = af->setsockopt(sk, level, optname, optval, optlen);
3591 case SCTP_SOCKOPT_BINDX_ADD:
3592 /* 'optlen' is the size of the addresses buffer. */
3593 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3594 optlen, SCTP_BINDX_ADD_ADDR);
3597 case SCTP_SOCKOPT_BINDX_REM:
3598 /* 'optlen' is the size of the addresses buffer. */
3599 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3600 optlen, SCTP_BINDX_REM_ADDR);
3603 case SCTP_SOCKOPT_CONNECTX_OLD:
3604 /* 'optlen' is the size of the addresses buffer. */
3605 retval = sctp_setsockopt_connectx_old(sk,
3606 (struct sockaddr __user *)optval,
3610 case SCTP_SOCKOPT_CONNECTX:
3611 /* 'optlen' is the size of the addresses buffer. */
3612 retval = sctp_setsockopt_connectx(sk,
3613 (struct sockaddr __user *)optval,
3617 case SCTP_DISABLE_FRAGMENTS:
3618 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3622 retval = sctp_setsockopt_events(sk, optval, optlen);
3625 case SCTP_AUTOCLOSE:
3626 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3629 case SCTP_PEER_ADDR_PARAMS:
3630 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3633 case SCTP_DELAYED_SACK:
3634 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3636 case SCTP_PARTIAL_DELIVERY_POINT:
3637 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3641 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3643 case SCTP_DEFAULT_SEND_PARAM:
3644 retval = sctp_setsockopt_default_send_param(sk, optval,
3647 case SCTP_PRIMARY_ADDR:
3648 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3650 case SCTP_SET_PEER_PRIMARY_ADDR:
3651 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3654 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3657 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3659 case SCTP_ASSOCINFO:
3660 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3662 case SCTP_I_WANT_MAPPED_V4_ADDR:
3663 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3666 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3668 case SCTP_ADAPTATION_LAYER:
3669 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3672 retval = sctp_setsockopt_context(sk, optval, optlen);
3674 case SCTP_FRAGMENT_INTERLEAVE:
3675 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3677 case SCTP_MAX_BURST:
3678 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3680 case SCTP_AUTH_CHUNK:
3681 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3683 case SCTP_HMAC_IDENT:
3684 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3687 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3689 case SCTP_AUTH_ACTIVE_KEY:
3690 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3692 case SCTP_AUTH_DELETE_KEY:
3693 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3695 case SCTP_AUTO_ASCONF:
3696 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3698 case SCTP_PEER_ADDR_THLDS:
3699 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3702 retval = -ENOPROTOOPT;
3706 sctp_release_sock(sk);
3712 /* API 3.1.6 connect() - UDP Style Syntax
3714 * An application may use the connect() call in the UDP model to initiate an
3715 * association without sending data.
3719 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3721 * sd: the socket descriptor to have a new association added to.
3723 * nam: the address structure (either struct sockaddr_in or struct
3724 * sockaddr_in6 defined in RFC2553 [7]).
3726 * len: the size of the address.
3728 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3736 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3737 __func__, sk, addr, addr_len);
3739 /* Validate addr_len before calling common connect/connectx routine. */
3740 af = sctp_get_af_specific(addr->sa_family);
3741 if (!af || addr_len < af->sockaddr_len) {
3744 /* Pass correct addr len to common routine (so it knows there
3745 * is only one address being passed.
3747 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3750 sctp_release_sock(sk);
3754 /* FIXME: Write comments. */
3755 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3757 return -EOPNOTSUPP; /* STUB */
3760 /* 4.1.4 accept() - TCP Style Syntax
3762 * Applications use accept() call to remove an established SCTP
3763 * association from the accept queue of the endpoint. A new socket
3764 * descriptor will be returned from accept() to represent the newly
3765 * formed association.
3767 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3769 struct sctp_sock *sp;
3770 struct sctp_endpoint *ep;
3771 struct sock *newsk = NULL;
3772 struct sctp_association *asoc;
3781 if (!sctp_style(sk, TCP)) {
3782 error = -EOPNOTSUPP;
3786 if (!sctp_sstate(sk, LISTENING)) {
3791 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3793 error = sctp_wait_for_accept(sk, timeo);
3797 /* We treat the list of associations on the endpoint as the accept
3798 * queue and pick the first association on the list.
3800 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3802 newsk = sp->pf->create_accept_sk(sk, asoc);
3808 /* Populate the fields of the newsk from the oldsk and migrate the
3809 * asoc to the newsk.
3811 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3814 sctp_release_sock(sk);
3819 /* The SCTP ioctl handler. */
3820 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3827 * SEQPACKET-style sockets in LISTENING state are valid, for
3828 * SCTP, so only discard TCP-style sockets in LISTENING state.
3830 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3835 struct sk_buff *skb;
3836 unsigned int amount = 0;
3838 skb = skb_peek(&sk->sk_receive_queue);
3841 * We will only return the amount of this packet since
3842 * that is all that will be read.
3846 rc = put_user(amount, (int __user *)arg);
3854 sctp_release_sock(sk);
3858 /* This is the function which gets called during socket creation to
3859 * initialized the SCTP-specific portion of the sock.
3860 * The sock structure should already be zero-filled memory.
3862 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3864 struct net *net = sock_net(sk);
3865 struct sctp_endpoint *ep;
3866 struct sctp_sock *sp;
3868 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3872 /* Initialize the SCTP per socket area. */
3873 switch (sk->sk_type) {
3874 case SOCK_SEQPACKET:
3875 sp->type = SCTP_SOCKET_UDP;
3878 sp->type = SCTP_SOCKET_TCP;
3881 return -ESOCKTNOSUPPORT;
3884 /* Initialize default send parameters. These parameters can be
3885 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3887 sp->default_stream = 0;
3888 sp->default_ppid = 0;
3889 sp->default_flags = 0;
3890 sp->default_context = 0;
3891 sp->default_timetolive = 0;
3893 sp->default_rcv_context = 0;
3894 sp->max_burst = net->sctp.max_burst;
3896 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
3898 /* Initialize default setup parameters. These parameters
3899 * can be modified with the SCTP_INITMSG socket option or
3900 * overridden by the SCTP_INIT CMSG.
3902 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3903 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3904 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
3905 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
3907 /* Initialize default RTO related parameters. These parameters can
3908 * be modified for with the SCTP_RTOINFO socket option.
3910 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3911 sp->rtoinfo.srto_max = net->sctp.rto_max;
3912 sp->rtoinfo.srto_min = net->sctp.rto_min;
3914 /* Initialize default association related parameters. These parameters
3915 * can be modified with the SCTP_ASSOCINFO socket option.
3917 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
3918 sp->assocparams.sasoc_number_peer_destinations = 0;
3919 sp->assocparams.sasoc_peer_rwnd = 0;
3920 sp->assocparams.sasoc_local_rwnd = 0;
3921 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
3923 /* Initialize default event subscriptions. By default, all the
3926 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3928 /* Default Peer Address Parameters. These defaults can
3929 * be modified via SCTP_PEER_ADDR_PARAMS
3931 sp->hbinterval = net->sctp.hb_interval;
3932 sp->pathmaxrxt = net->sctp.max_retrans_path;
3933 sp->pathmtu = 0; // allow default discovery
3934 sp->sackdelay = net->sctp.sack_timeout;
3936 sp->param_flags = SPP_HB_ENABLE |
3938 SPP_SACKDELAY_ENABLE;
3940 /* If enabled no SCTP message fragmentation will be performed.
3941 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3943 sp->disable_fragments = 0;
3945 /* Enable Nagle algorithm by default. */
3948 /* Enable by default. */
3951 /* Auto-close idle associations after the configured
3952 * number of seconds. A value of 0 disables this
3953 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3954 * for UDP-style sockets only.
3958 /* User specified fragmentation limit. */
3961 sp->adaptation_ind = 0;
3963 sp->pf = sctp_get_pf_specific(sk->sk_family);
3965 /* Control variables for partial data delivery. */
3966 atomic_set(&sp->pd_mode, 0);
3967 skb_queue_head_init(&sp->pd_lobby);
3968 sp->frag_interleave = 0;
3970 /* Create a per socket endpoint structure. Even if we
3971 * change the data structure relationships, this may still
3972 * be useful for storing pre-connect address information.
3974 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3981 SCTP_DBG_OBJCNT_INC(sock);
3984 percpu_counter_inc(&sctp_sockets_allocated);
3985 sock_prot_inuse_add(net, sk->sk_prot, 1);
3986 if (net->sctp.default_auto_asconf) {
3987 list_add_tail(&sp->auto_asconf_list,
3988 &net->sctp.auto_asconf_splist);
3989 sp->do_auto_asconf = 1;
3991 sp->do_auto_asconf = 0;
3997 /* Cleanup any SCTP per socket resources. */
3998 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
4000 struct sctp_sock *sp;
4002 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
4004 /* Release our hold on the endpoint. */
4006 /* This could happen during socket init, thus we bail out
4007 * early, since the rest of the below is not setup either.
4012 if (sp->do_auto_asconf) {
4013 sp->do_auto_asconf = 0;
4014 list_del(&sp->auto_asconf_list);
4016 sctp_endpoint_free(sp->ep);
4018 percpu_counter_dec(&sctp_sockets_allocated);
4019 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4023 /* API 4.1.7 shutdown() - TCP Style Syntax
4024 * int shutdown(int socket, int how);
4026 * sd - the socket descriptor of the association to be closed.
4027 * how - Specifies the type of shutdown. The values are
4030 * Disables further receive operations. No SCTP
4031 * protocol action is taken.
4033 * Disables further send operations, and initiates
4034 * the SCTP shutdown sequence.
4036 * Disables further send and receive operations
4037 * and initiates the SCTP shutdown sequence.
4039 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
4041 struct net *net = sock_net(sk);
4042 struct sctp_endpoint *ep;
4043 struct sctp_association *asoc;
4045 if (!sctp_style(sk, TCP))
4048 if (how & SEND_SHUTDOWN) {
4049 ep = sctp_sk(sk)->ep;
4050 if (!list_empty(&ep->asocs)) {
4051 asoc = list_entry(ep->asocs.next,
4052 struct sctp_association, asocs);
4053 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4058 /* 7.2.1 Association Status (SCTP_STATUS)
4060 * Applications can retrieve current status information about an
4061 * association, including association state, peer receiver window size,
4062 * number of unacked data chunks, and number of data chunks pending
4063 * receipt. This information is read-only.
4065 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4066 char __user *optval,
4069 struct sctp_status status;
4070 struct sctp_association *asoc = NULL;
4071 struct sctp_transport *transport;
4072 sctp_assoc_t associd;
4075 if (len < sizeof(status)) {
4080 len = sizeof(status);
4081 if (copy_from_user(&status, optval, len)) {
4086 associd = status.sstat_assoc_id;
4087 asoc = sctp_id2assoc(sk, associd);
4093 transport = asoc->peer.primary_path;
4095 status.sstat_assoc_id = sctp_assoc2id(asoc);
4096 status.sstat_state = asoc->state;
4097 status.sstat_rwnd = asoc->peer.rwnd;
4098 status.sstat_unackdata = asoc->unack_data;
4100 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4101 status.sstat_instrms = asoc->c.sinit_max_instreams;
4102 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4103 status.sstat_fragmentation_point = asoc->frag_point;
4104 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4105 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4106 transport->af_specific->sockaddr_len);
4107 /* Map ipv4 address into v4-mapped-on-v6 address. */
4108 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4109 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4110 status.sstat_primary.spinfo_state = transport->state;
4111 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4112 status.sstat_primary.spinfo_srtt = transport->srtt;
4113 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4114 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4116 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4117 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4119 if (put_user(len, optlen)) {
4124 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4125 len, status.sstat_state, status.sstat_rwnd,
4126 status.sstat_assoc_id);
4128 if (copy_to_user(optval, &status, len)) {
4138 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4140 * Applications can retrieve information about a specific peer address
4141 * of an association, including its reachability state, congestion
4142 * window, and retransmission timer values. This information is
4145 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4146 char __user *optval,
4149 struct sctp_paddrinfo pinfo;
4150 struct sctp_transport *transport;
4153 if (len < sizeof(pinfo)) {
4158 len = sizeof(pinfo);
4159 if (copy_from_user(&pinfo, optval, len)) {
4164 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4165 pinfo.spinfo_assoc_id);
4169 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4170 pinfo.spinfo_state = transport->state;
4171 pinfo.spinfo_cwnd = transport->cwnd;
4172 pinfo.spinfo_srtt = transport->srtt;
4173 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4174 pinfo.spinfo_mtu = transport->pathmtu;
4176 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4177 pinfo.spinfo_state = SCTP_ACTIVE;
4179 if (put_user(len, optlen)) {
4184 if (copy_to_user(optval, &pinfo, len)) {
4193 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4195 * This option is a on/off flag. If enabled no SCTP message
4196 * fragmentation will be performed. Instead if a message being sent
4197 * exceeds the current PMTU size, the message will NOT be sent and
4198 * instead a error will be indicated to the user.
4200 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4201 char __user *optval, int __user *optlen)
4205 if (len < sizeof(int))
4209 val = (sctp_sk(sk)->disable_fragments == 1);
4210 if (put_user(len, optlen))
4212 if (copy_to_user(optval, &val, len))
4217 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4219 * This socket option is used to specify various notifications and
4220 * ancillary data the user wishes to receive.
4222 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4227 if (len > sizeof(struct sctp_event_subscribe))
4228 len = sizeof(struct sctp_event_subscribe);
4229 if (put_user(len, optlen))
4231 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4236 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4238 * This socket option is applicable to the UDP-style socket only. When
4239 * set it will cause associations that are idle for more than the
4240 * specified number of seconds to automatically close. An association
4241 * being idle is defined an association that has NOT sent or received
4242 * user data. The special value of '0' indicates that no automatic
4243 * close of any associations should be performed. The option expects an
4244 * integer defining the number of seconds of idle time before an
4245 * association is closed.
4247 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4249 /* Applicable to UDP-style socket only */
4250 if (sctp_style(sk, TCP))
4252 if (len < sizeof(int))
4255 if (put_user(len, optlen))
4257 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4262 /* Helper routine to branch off an association to a new socket. */
4263 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4265 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4266 struct socket *sock;
4273 /* An association cannot be branched off from an already peeled-off
4274 * socket, nor is this supported for tcp style sockets.
4276 if (!sctp_style(sk, UDP))
4279 /* Create a new socket. */
4280 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4284 sctp_copy_sock(sock->sk, sk, asoc);
4286 /* Make peeled-off sockets more like 1-1 accepted sockets.
4287 * Set the daddr and initialize id to something more random
4289 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4290 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4292 /* Populate the fields of the newsk from the oldsk and migrate the
4293 * asoc to the newsk.
4295 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4301 EXPORT_SYMBOL(sctp_do_peeloff);
4303 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4305 sctp_peeloff_arg_t peeloff;
4306 struct socket *newsock;
4307 struct file *newfile;
4310 if (len < sizeof(sctp_peeloff_arg_t))
4312 len = sizeof(sctp_peeloff_arg_t);
4313 if (copy_from_user(&peeloff, optval, len))
4316 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4320 /* Map the socket to an unused fd that can be returned to the user. */
4321 retval = get_unused_fd();
4323 sock_release(newsock);
4327 newfile = sock_alloc_file(newsock, 0, NULL);
4328 if (unlikely(IS_ERR(newfile))) {
4329 put_unused_fd(retval);
4330 sock_release(newsock);
4331 return PTR_ERR(newfile);
4334 SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4335 __func__, sk, newsock->sk, retval);
4337 /* Return the fd mapped to the new socket. */
4338 if (put_user(len, optlen)) {
4340 put_unused_fd(retval);
4343 peeloff.sd = retval;
4344 if (copy_to_user(optval, &peeloff, len)) {
4346 put_unused_fd(retval);
4349 fd_install(retval, newfile);
4354 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4356 * Applications can enable or disable heartbeats for any peer address of
4357 * an association, modify an address's heartbeat interval, force a
4358 * heartbeat to be sent immediately, and adjust the address's maximum
4359 * number of retransmissions sent before an address is considered
4360 * unreachable. The following structure is used to access and modify an
4361 * address's parameters:
4363 * struct sctp_paddrparams {
4364 * sctp_assoc_t spp_assoc_id;
4365 * struct sockaddr_storage spp_address;
4366 * uint32_t spp_hbinterval;
4367 * uint16_t spp_pathmaxrxt;
4368 * uint32_t spp_pathmtu;
4369 * uint32_t spp_sackdelay;
4370 * uint32_t spp_flags;
4373 * spp_assoc_id - (one-to-many style socket) This is filled in the
4374 * application, and identifies the association for
4376 * spp_address - This specifies which address is of interest.
4377 * spp_hbinterval - This contains the value of the heartbeat interval,
4378 * in milliseconds. If a value of zero
4379 * is present in this field then no changes are to
4380 * be made to this parameter.
4381 * spp_pathmaxrxt - This contains the maximum number of
4382 * retransmissions before this address shall be
4383 * considered unreachable. If a value of zero
4384 * is present in this field then no changes are to
4385 * be made to this parameter.
4386 * spp_pathmtu - When Path MTU discovery is disabled the value
4387 * specified here will be the "fixed" path mtu.
4388 * Note that if the spp_address field is empty
4389 * then all associations on this address will
4390 * have this fixed path mtu set upon them.
4392 * spp_sackdelay - When delayed sack is enabled, this value specifies
4393 * the number of milliseconds that sacks will be delayed
4394 * for. This value will apply to all addresses of an
4395 * association if the spp_address field is empty. Note
4396 * also, that if delayed sack is enabled and this
4397 * value is set to 0, no change is made to the last
4398 * recorded delayed sack timer value.
4400 * spp_flags - These flags are used to control various features
4401 * on an association. The flag field may contain
4402 * zero or more of the following options.
4404 * SPP_HB_ENABLE - Enable heartbeats on the
4405 * specified address. Note that if the address
4406 * field is empty all addresses for the association
4407 * have heartbeats enabled upon them.
4409 * SPP_HB_DISABLE - Disable heartbeats on the
4410 * speicifed address. Note that if the address
4411 * field is empty all addresses for the association
4412 * will have their heartbeats disabled. Note also
4413 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4414 * mutually exclusive, only one of these two should
4415 * be specified. Enabling both fields will have
4416 * undetermined results.
4418 * SPP_HB_DEMAND - Request a user initiated heartbeat
4419 * to be made immediately.
4421 * SPP_PMTUD_ENABLE - This field will enable PMTU
4422 * discovery upon the specified address. Note that
4423 * if the address feild is empty then all addresses
4424 * on the association are effected.
4426 * SPP_PMTUD_DISABLE - This field will disable PMTU
4427 * discovery upon the specified address. Note that
4428 * if the address feild is empty then all addresses
4429 * on the association are effected. Not also that
4430 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4431 * exclusive. Enabling both will have undetermined
4434 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4435 * on delayed sack. The time specified in spp_sackdelay
4436 * is used to specify the sack delay for this address. Note
4437 * that if spp_address is empty then all addresses will
4438 * enable delayed sack and take on the sack delay
4439 * value specified in spp_sackdelay.
4440 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4441 * off delayed sack. If the spp_address field is blank then
4442 * delayed sack is disabled for the entire association. Note
4443 * also that this field is mutually exclusive to
4444 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4447 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4448 char __user *optval, int __user *optlen)
4450 struct sctp_paddrparams params;
4451 struct sctp_transport *trans = NULL;
4452 struct sctp_association *asoc = NULL;
4453 struct sctp_sock *sp = sctp_sk(sk);
4455 if (len < sizeof(struct sctp_paddrparams))
4457 len = sizeof(struct sctp_paddrparams);
4458 if (copy_from_user(¶ms, optval, len))
4461 /* If an address other than INADDR_ANY is specified, and
4462 * no transport is found, then the request is invalid.
4464 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4465 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4466 params.spp_assoc_id);
4468 SCTP_DEBUG_PRINTK("Failed no transport\n");
4473 /* Get association, if assoc_id != 0 and the socket is a one
4474 * to many style socket, and an association was not found, then
4475 * the id was invalid.
4477 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4478 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4479 SCTP_DEBUG_PRINTK("Failed no association\n");
4484 /* Fetch transport values. */
4485 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4486 params.spp_pathmtu = trans->pathmtu;
4487 params.spp_pathmaxrxt = trans->pathmaxrxt;
4488 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4490 /*draft-11 doesn't say what to return in spp_flags*/
4491 params.spp_flags = trans->param_flags;
4493 /* Fetch association values. */
4494 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4495 params.spp_pathmtu = asoc->pathmtu;
4496 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4497 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4499 /*draft-11 doesn't say what to return in spp_flags*/
4500 params.spp_flags = asoc->param_flags;
4502 /* Fetch socket values. */
4503 params.spp_hbinterval = sp->hbinterval;
4504 params.spp_pathmtu = sp->pathmtu;
4505 params.spp_sackdelay = sp->sackdelay;
4506 params.spp_pathmaxrxt = sp->pathmaxrxt;
4508 /*draft-11 doesn't say what to return in spp_flags*/
4509 params.spp_flags = sp->param_flags;
4512 if (copy_to_user(optval, ¶ms, len))
4515 if (put_user(len, optlen))
4522 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4524 * This option will effect the way delayed acks are performed. This
4525 * option allows you to get or set the delayed ack time, in
4526 * milliseconds. It also allows changing the delayed ack frequency.
4527 * Changing the frequency to 1 disables the delayed sack algorithm. If
4528 * the assoc_id is 0, then this sets or gets the endpoints default
4529 * values. If the assoc_id field is non-zero, then the set or get
4530 * effects the specified association for the one to many model (the
4531 * assoc_id field is ignored by the one to one model). Note that if
4532 * sack_delay or sack_freq are 0 when setting this option, then the
4533 * current values will remain unchanged.
4535 * struct sctp_sack_info {
4536 * sctp_assoc_t sack_assoc_id;
4537 * uint32_t sack_delay;
4538 * uint32_t sack_freq;
4541 * sack_assoc_id - This parameter, indicates which association the user
4542 * is performing an action upon. Note that if this field's value is
4543 * zero then the endpoints default value is changed (effecting future
4544 * associations only).
4546 * sack_delay - This parameter contains the number of milliseconds that
4547 * the user is requesting the delayed ACK timer be set to. Note that
4548 * this value is defined in the standard to be between 200 and 500
4551 * sack_freq - This parameter contains the number of packets that must
4552 * be received before a sack is sent without waiting for the delay
4553 * timer to expire. The default value for this is 2, setting this
4554 * value to 1 will disable the delayed sack algorithm.
4556 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4557 char __user *optval,
4560 struct sctp_sack_info params;
4561 struct sctp_association *asoc = NULL;
4562 struct sctp_sock *sp = sctp_sk(sk);
4564 if (len >= sizeof(struct sctp_sack_info)) {
4565 len = sizeof(struct sctp_sack_info);
4567 if (copy_from_user(¶ms, optval, len))
4569 } else if (len == sizeof(struct sctp_assoc_value)) {
4570 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4571 pr_warn("Use struct sctp_sack_info instead\n");
4572 if (copy_from_user(¶ms, optval, len))
4577 /* Get association, if sack_assoc_id != 0 and the socket is a one
4578 * to many style socket, and an association was not found, then
4579 * the id was invalid.
4581 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4582 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4586 /* Fetch association values. */
4587 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4588 params.sack_delay = jiffies_to_msecs(
4590 params.sack_freq = asoc->sackfreq;
4593 params.sack_delay = 0;
4594 params.sack_freq = 1;
4597 /* Fetch socket values. */
4598 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4599 params.sack_delay = sp->sackdelay;
4600 params.sack_freq = sp->sackfreq;
4602 params.sack_delay = 0;
4603 params.sack_freq = 1;
4607 if (copy_to_user(optval, ¶ms, len))
4610 if (put_user(len, optlen))
4616 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4618 * Applications can specify protocol parameters for the default association
4619 * initialization. The option name argument to setsockopt() and getsockopt()
4622 * Setting initialization parameters is effective only on an unconnected
4623 * socket (for UDP-style sockets only future associations are effected
4624 * by the change). With TCP-style sockets, this option is inherited by
4625 * sockets derived from a listener socket.
4627 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4629 if (len < sizeof(struct sctp_initmsg))
4631 len = sizeof(struct sctp_initmsg);
4632 if (put_user(len, optlen))
4634 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4640 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4641 char __user *optval, int __user *optlen)
4643 struct sctp_association *asoc;
4645 struct sctp_getaddrs getaddrs;
4646 struct sctp_transport *from;
4648 union sctp_addr temp;
4649 struct sctp_sock *sp = sctp_sk(sk);
4654 if (len < sizeof(struct sctp_getaddrs))
4657 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4660 /* For UDP-style sockets, id specifies the association to query. */
4661 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4665 to = optval + offsetof(struct sctp_getaddrs,addrs);
4666 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4668 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4670 memcpy(&temp, &from->ipaddr, sizeof(temp));
4671 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4672 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4673 if (space_left < addrlen)
4675 if (copy_to_user(to, &temp, addrlen))
4679 space_left -= addrlen;
4682 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4684 bytes_copied = ((char __user *)to) - optval;
4685 if (put_user(bytes_copied, optlen))
4691 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4692 size_t space_left, int *bytes_copied)
4694 struct sctp_sockaddr_entry *addr;
4695 union sctp_addr temp;
4698 struct net *net = sock_net(sk);
4701 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4705 if ((PF_INET == sk->sk_family) &&
4706 (AF_INET6 == addr->a.sa.sa_family))
4708 if ((PF_INET6 == sk->sk_family) &&
4709 inet_v6_ipv6only(sk) &&
4710 (AF_INET == addr->a.sa.sa_family))
4712 memcpy(&temp, &addr->a, sizeof(temp));
4713 if (!temp.v4.sin_port)
4714 temp.v4.sin_port = htons(port);
4716 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4718 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4719 if (space_left < addrlen) {
4723 memcpy(to, &temp, addrlen);
4727 space_left -= addrlen;
4728 *bytes_copied += addrlen;
4736 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4737 char __user *optval, int __user *optlen)
4739 struct sctp_bind_addr *bp;
4740 struct sctp_association *asoc;
4742 struct sctp_getaddrs getaddrs;
4743 struct sctp_sockaddr_entry *addr;
4745 union sctp_addr temp;
4746 struct sctp_sock *sp = sctp_sk(sk);
4750 int bytes_copied = 0;
4754 if (len < sizeof(struct sctp_getaddrs))
4757 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4761 * For UDP-style sockets, id specifies the association to query.
4762 * If the id field is set to the value '0' then the locally bound
4763 * addresses are returned without regard to any particular
4766 if (0 == getaddrs.assoc_id) {
4767 bp = &sctp_sk(sk)->ep->base.bind_addr;
4769 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4772 bp = &asoc->base.bind_addr;
4775 to = optval + offsetof(struct sctp_getaddrs,addrs);
4776 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4778 addrs = kmalloc(space_left, GFP_KERNEL);
4782 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4783 * addresses from the global local address list.
4785 if (sctp_list_single_entry(&bp->address_list)) {
4786 addr = list_entry(bp->address_list.next,
4787 struct sctp_sockaddr_entry, list);
4788 if (sctp_is_any(sk, &addr->a)) {
4789 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4790 space_left, &bytes_copied);
4800 /* Protection on the bound address list is not needed since
4801 * in the socket option context we hold a socket lock and
4802 * thus the bound address list can't change.
4804 list_for_each_entry(addr, &bp->address_list, list) {
4805 memcpy(&temp, &addr->a, sizeof(temp));
4806 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4807 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4808 if (space_left < addrlen) {
4809 err = -ENOMEM; /*fixme: right error?*/
4812 memcpy(buf, &temp, addrlen);
4814 bytes_copied += addrlen;
4816 space_left -= addrlen;
4820 if (copy_to_user(to, addrs, bytes_copied)) {
4824 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4828 if (put_user(bytes_copied, optlen))
4835 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4837 * Requests that the local SCTP stack use the enclosed peer address as
4838 * the association primary. The enclosed address must be one of the
4839 * association peer's addresses.
4841 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4842 char __user *optval, int __user *optlen)
4844 struct sctp_prim prim;
4845 struct sctp_association *asoc;
4846 struct sctp_sock *sp = sctp_sk(sk);
4848 if (len < sizeof(struct sctp_prim))
4851 len = sizeof(struct sctp_prim);
4853 if (copy_from_user(&prim, optval, len))
4856 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4860 if (!asoc->peer.primary_path)
4863 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4864 asoc->peer.primary_path->af_specific->sockaddr_len);
4866 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4867 (union sctp_addr *)&prim.ssp_addr);
4869 if (put_user(len, optlen))
4871 if (copy_to_user(optval, &prim, len))
4878 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4880 * Requests that the local endpoint set the specified Adaptation Layer
4881 * Indication parameter for all future INIT and INIT-ACK exchanges.
4883 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4884 char __user *optval, int __user *optlen)
4886 struct sctp_setadaptation adaptation;
4888 if (len < sizeof(struct sctp_setadaptation))
4891 len = sizeof(struct sctp_setadaptation);
4893 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4895 if (put_user(len, optlen))
4897 if (copy_to_user(optval, &adaptation, len))
4905 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4907 * Applications that wish to use the sendto() system call may wish to
4908 * specify a default set of parameters that would normally be supplied
4909 * through the inclusion of ancillary data. This socket option allows
4910 * such an application to set the default sctp_sndrcvinfo structure.
4913 * The application that wishes to use this socket option simply passes
4914 * in to this call the sctp_sndrcvinfo structure defined in Section
4915 * 5.2.2) The input parameters accepted by this call include
4916 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4917 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4918 * to this call if the caller is using the UDP model.
4920 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4922 static int sctp_getsockopt_default_send_param(struct sock *sk,
4923 int len, char __user *optval,
4926 struct sctp_sndrcvinfo info;
4927 struct sctp_association *asoc;
4928 struct sctp_sock *sp = sctp_sk(sk);
4930 if (len < sizeof(struct sctp_sndrcvinfo))
4933 len = sizeof(struct sctp_sndrcvinfo);
4935 if (copy_from_user(&info, optval, len))
4938 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4939 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4943 info.sinfo_stream = asoc->default_stream;
4944 info.sinfo_flags = asoc->default_flags;
4945 info.sinfo_ppid = asoc->default_ppid;
4946 info.sinfo_context = asoc->default_context;
4947 info.sinfo_timetolive = asoc->default_timetolive;
4949 info.sinfo_stream = sp->default_stream;
4950 info.sinfo_flags = sp->default_flags;
4951 info.sinfo_ppid = sp->default_ppid;
4952 info.sinfo_context = sp->default_context;
4953 info.sinfo_timetolive = sp->default_timetolive;
4956 if (put_user(len, optlen))
4958 if (copy_to_user(optval, &info, len))
4966 * 7.1.5 SCTP_NODELAY
4968 * Turn on/off any Nagle-like algorithm. This means that packets are
4969 * generally sent as soon as possible and no unnecessary delays are
4970 * introduced, at the cost of more packets in the network. Expects an
4971 * integer boolean flag.
4974 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4975 char __user *optval, int __user *optlen)
4979 if (len < sizeof(int))
4983 val = (sctp_sk(sk)->nodelay == 1);
4984 if (put_user(len, optlen))
4986 if (copy_to_user(optval, &val, len))
4993 * 7.1.1 SCTP_RTOINFO
4995 * The protocol parameters used to initialize and bound retransmission
4996 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4997 * and modify these parameters.
4998 * All parameters are time values, in milliseconds. A value of 0, when
4999 * modifying the parameters, indicates that the current value should not
5003 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5004 char __user *optval,
5005 int __user *optlen) {
5006 struct sctp_rtoinfo rtoinfo;
5007 struct sctp_association *asoc;
5009 if (len < sizeof (struct sctp_rtoinfo))
5012 len = sizeof(struct sctp_rtoinfo);
5014 if (copy_from_user(&rtoinfo, optval, len))
5017 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5019 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5022 /* Values corresponding to the specific association. */
5024 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5025 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5026 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5028 /* Values corresponding to the endpoint. */
5029 struct sctp_sock *sp = sctp_sk(sk);
5031 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5032 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5033 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5036 if (put_user(len, optlen))
5039 if (copy_to_user(optval, &rtoinfo, len))
5047 * 7.1.2 SCTP_ASSOCINFO
5049 * This option is used to tune the maximum retransmission attempts
5050 * of the association.
5051 * Returns an error if the new association retransmission value is
5052 * greater than the sum of the retransmission value of the peer.
5053 * See [SCTP] for more information.
5056 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5057 char __user *optval,
5061 struct sctp_assocparams assocparams;
5062 struct sctp_association *asoc;
5063 struct list_head *pos;
5066 if (len < sizeof (struct sctp_assocparams))
5069 len = sizeof(struct sctp_assocparams);
5071 if (copy_from_user(&assocparams, optval, len))
5074 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5076 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5079 /* Values correspoinding to the specific association */
5081 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5082 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5083 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5084 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5086 (asoc->cookie_life.tv_usec
5089 list_for_each(pos, &asoc->peer.transport_addr_list) {
5093 assocparams.sasoc_number_peer_destinations = cnt;
5095 /* Values corresponding to the endpoint */
5096 struct sctp_sock *sp = sctp_sk(sk);
5098 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5099 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5100 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5101 assocparams.sasoc_cookie_life =
5102 sp->assocparams.sasoc_cookie_life;
5103 assocparams.sasoc_number_peer_destinations =
5105 sasoc_number_peer_destinations;
5108 if (put_user(len, optlen))
5111 if (copy_to_user(optval, &assocparams, len))
5118 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5120 * This socket option is a boolean flag which turns on or off mapped V4
5121 * addresses. If this option is turned on and the socket is type
5122 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5123 * If this option is turned off, then no mapping will be done of V4
5124 * addresses and a user will receive both PF_INET6 and PF_INET type
5125 * addresses on the socket.
5127 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5128 char __user *optval, int __user *optlen)
5131 struct sctp_sock *sp = sctp_sk(sk);
5133 if (len < sizeof(int))
5138 if (put_user(len, optlen))
5140 if (copy_to_user(optval, &val, len))
5147 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5148 * (chapter and verse is quoted at sctp_setsockopt_context())
5150 static int sctp_getsockopt_context(struct sock *sk, int len,
5151 char __user *optval, int __user *optlen)
5153 struct sctp_assoc_value params;
5154 struct sctp_sock *sp;
5155 struct sctp_association *asoc;
5157 if (len < sizeof(struct sctp_assoc_value))
5160 len = sizeof(struct sctp_assoc_value);
5162 if (copy_from_user(¶ms, optval, len))
5167 if (params.assoc_id != 0) {
5168 asoc = sctp_id2assoc(sk, params.assoc_id);
5171 params.assoc_value = asoc->default_rcv_context;
5173 params.assoc_value = sp->default_rcv_context;
5176 if (put_user(len, optlen))
5178 if (copy_to_user(optval, ¶ms, len))
5185 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5186 * This option will get or set the maximum size to put in any outgoing
5187 * SCTP DATA chunk. If a message is larger than this size it will be
5188 * fragmented by SCTP into the specified size. Note that the underlying
5189 * SCTP implementation may fragment into smaller sized chunks when the
5190 * PMTU of the underlying association is smaller than the value set by
5191 * the user. The default value for this option is '0' which indicates
5192 * the user is NOT limiting fragmentation and only the PMTU will effect
5193 * SCTP's choice of DATA chunk size. Note also that values set larger
5194 * than the maximum size of an IP datagram will effectively let SCTP
5195 * control fragmentation (i.e. the same as setting this option to 0).
5197 * The following structure is used to access and modify this parameter:
5199 * struct sctp_assoc_value {
5200 * sctp_assoc_t assoc_id;
5201 * uint32_t assoc_value;
5204 * assoc_id: This parameter is ignored for one-to-one style sockets.
5205 * For one-to-many style sockets this parameter indicates which
5206 * association the user is performing an action upon. Note that if
5207 * this field's value is zero then the endpoints default value is
5208 * changed (effecting future associations only).
5209 * assoc_value: This parameter specifies the maximum size in bytes.
5211 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5212 char __user *optval, int __user *optlen)
5214 struct sctp_assoc_value params;
5215 struct sctp_association *asoc;
5217 if (len == sizeof(int)) {
5218 pr_warn("Use of int in maxseg socket option deprecated\n");
5219 pr_warn("Use struct sctp_assoc_value instead\n");
5220 params.assoc_id = 0;
5221 } else if (len >= sizeof(struct sctp_assoc_value)) {
5222 len = sizeof(struct sctp_assoc_value);
5223 if (copy_from_user(¶ms, optval, sizeof(params)))
5228 asoc = sctp_id2assoc(sk, params.assoc_id);
5229 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5233 params.assoc_value = asoc->frag_point;
5235 params.assoc_value = sctp_sk(sk)->user_frag;
5237 if (put_user(len, optlen))
5239 if (len == sizeof(int)) {
5240 if (copy_to_user(optval, ¶ms.assoc_value, len))
5243 if (copy_to_user(optval, ¶ms, len))
5251 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5252 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5254 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5255 char __user *optval, int __user *optlen)
5259 if (len < sizeof(int))
5264 val = sctp_sk(sk)->frag_interleave;
5265 if (put_user(len, optlen))
5267 if (copy_to_user(optval, &val, len))
5274 * 7.1.25. Set or Get the sctp partial delivery point
5275 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5277 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5278 char __user *optval,
5283 if (len < sizeof(u32))
5288 val = sctp_sk(sk)->pd_point;
5289 if (put_user(len, optlen))
5291 if (copy_to_user(optval, &val, len))
5298 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5299 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5301 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5302 char __user *optval,
5305 struct sctp_assoc_value params;
5306 struct sctp_sock *sp;
5307 struct sctp_association *asoc;
5309 if (len == sizeof(int)) {
5310 pr_warn("Use of int in max_burst socket option deprecated\n");
5311 pr_warn("Use struct sctp_assoc_value instead\n");
5312 params.assoc_id = 0;
5313 } else if (len >= sizeof(struct sctp_assoc_value)) {
5314 len = sizeof(struct sctp_assoc_value);
5315 if (copy_from_user(¶ms, optval, len))
5322 if (params.assoc_id != 0) {
5323 asoc = sctp_id2assoc(sk, params.assoc_id);
5326 params.assoc_value = asoc->max_burst;
5328 params.assoc_value = sp->max_burst;
5330 if (len == sizeof(int)) {
5331 if (copy_to_user(optval, ¶ms.assoc_value, len))
5334 if (copy_to_user(optval, ¶ms, len))
5342 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5343 char __user *optval, int __user *optlen)
5345 struct net *net = sock_net(sk);
5346 struct sctp_hmacalgo __user *p = (void __user *)optval;
5347 struct sctp_hmac_algo_param *hmacs;
5351 if (!net->sctp.auth_enable)
5354 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5355 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5357 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5360 len = sizeof(struct sctp_hmacalgo) + data_len;
5361 num_idents = data_len / sizeof(u16);
5363 if (put_user(len, optlen))
5365 if (put_user(num_idents, &p->shmac_num_idents))
5367 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5372 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5373 char __user *optval, int __user *optlen)
5375 struct net *net = sock_net(sk);
5376 struct sctp_authkeyid val;
5377 struct sctp_association *asoc;
5379 if (!net->sctp.auth_enable)
5382 if (len < sizeof(struct sctp_authkeyid))
5384 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5387 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5388 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5392 val.scact_keynumber = asoc->active_key_id;
5394 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5396 len = sizeof(struct sctp_authkeyid);
5397 if (put_user(len, optlen))
5399 if (copy_to_user(optval, &val, len))
5405 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5406 char __user *optval, int __user *optlen)
5408 struct net *net = sock_net(sk);
5409 struct sctp_authchunks __user *p = (void __user *)optval;
5410 struct sctp_authchunks val;
5411 struct sctp_association *asoc;
5412 struct sctp_chunks_param *ch;
5416 if (!net->sctp.auth_enable)
5419 if (len < sizeof(struct sctp_authchunks))
5422 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5425 to = p->gauth_chunks;
5426 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5430 ch = asoc->peer.peer_chunks;
5434 /* See if the user provided enough room for all the data */
5435 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5436 if (len < num_chunks)
5439 if (copy_to_user(to, ch->chunks, num_chunks))
5442 len = sizeof(struct sctp_authchunks) + num_chunks;
5443 if (put_user(len, optlen)) return -EFAULT;
5444 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5449 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5450 char __user *optval, int __user *optlen)
5452 struct net *net = sock_net(sk);
5453 struct sctp_authchunks __user *p = (void __user *)optval;
5454 struct sctp_authchunks val;
5455 struct sctp_association *asoc;
5456 struct sctp_chunks_param *ch;
5460 if (!net->sctp.auth_enable)
5463 if (len < sizeof(struct sctp_authchunks))
5466 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5469 to = p->gauth_chunks;
5470 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5471 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5475 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5477 ch = sctp_sk(sk)->ep->auth_chunk_list;
5482 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5483 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5486 if (copy_to_user(to, ch->chunks, num_chunks))
5489 len = sizeof(struct sctp_authchunks) + num_chunks;
5490 if (put_user(len, optlen))
5492 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5499 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5500 * This option gets the current number of associations that are attached
5501 * to a one-to-many style socket. The option value is an uint32_t.
5503 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5504 char __user *optval, int __user *optlen)
5506 struct sctp_sock *sp = sctp_sk(sk);
5507 struct sctp_association *asoc;
5510 if (sctp_style(sk, TCP))
5513 if (len < sizeof(u32))
5518 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5522 if (put_user(len, optlen))
5524 if (copy_to_user(optval, &val, len))
5531 * 8.1.23 SCTP_AUTO_ASCONF
5532 * See the corresponding setsockopt entry as description
5534 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5535 char __user *optval, int __user *optlen)
5539 if (len < sizeof(int))
5543 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5545 if (put_user(len, optlen))
5547 if (copy_to_user(optval, &val, len))
5553 * 8.2.6. Get the Current Identifiers of Associations
5554 * (SCTP_GET_ASSOC_ID_LIST)
5556 * This option gets the current list of SCTP association identifiers of
5557 * the SCTP associations handled by a one-to-many style socket.
5559 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5560 char __user *optval, int __user *optlen)
5562 struct sctp_sock *sp = sctp_sk(sk);
5563 struct sctp_association *asoc;
5564 struct sctp_assoc_ids *ids;
5567 if (sctp_style(sk, TCP))
5570 if (len < sizeof(struct sctp_assoc_ids))
5573 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5577 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5580 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5582 ids = kmalloc(len, GFP_KERNEL);
5586 ids->gaids_number_of_ids = num;
5588 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5589 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5592 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5602 * SCTP_PEER_ADDR_THLDS
5604 * This option allows us to fetch the partially failed threshold for one or all
5605 * transports in an association. See Section 6.1 of:
5606 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5608 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5609 char __user *optval,
5613 struct sctp_paddrthlds val;
5614 struct sctp_transport *trans;
5615 struct sctp_association *asoc;
5617 if (len < sizeof(struct sctp_paddrthlds))
5619 len = sizeof(struct sctp_paddrthlds);
5620 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5623 if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5624 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5628 val.spt_pathpfthld = asoc->pf_retrans;
5629 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5631 trans = sctp_addr_id2transport(sk, &val.spt_address,
5636 val.spt_pathmaxrxt = trans->pathmaxrxt;
5637 val.spt_pathpfthld = trans->pf_retrans;
5640 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5647 * SCTP_GET_ASSOC_STATS
5649 * This option retrieves local per endpoint statistics. It is modeled
5650 * after OpenSolaris' implementation
5652 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5653 char __user *optval,
5656 struct sctp_assoc_stats sas;
5657 struct sctp_association *asoc = NULL;
5659 /* User must provide at least the assoc id */
5660 if (len < sizeof(sctp_assoc_t))
5663 /* Allow the struct to grow and fill in as much as possible */
5664 len = min_t(size_t, len, sizeof(sas));
5666 if (copy_from_user(&sas, optval, len))
5669 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5673 sas.sas_rtxchunks = asoc->stats.rtxchunks;
5674 sas.sas_gapcnt = asoc->stats.gapcnt;
5675 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5676 sas.sas_osacks = asoc->stats.osacks;
5677 sas.sas_isacks = asoc->stats.isacks;
5678 sas.sas_octrlchunks = asoc->stats.octrlchunks;
5679 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5680 sas.sas_oodchunks = asoc->stats.oodchunks;
5681 sas.sas_iodchunks = asoc->stats.iodchunks;
5682 sas.sas_ouodchunks = asoc->stats.ouodchunks;
5683 sas.sas_iuodchunks = asoc->stats.iuodchunks;
5684 sas.sas_idupchunks = asoc->stats.idupchunks;
5685 sas.sas_opackets = asoc->stats.opackets;
5686 sas.sas_ipackets = asoc->stats.ipackets;
5688 /* New high max rto observed, will return 0 if not a single
5689 * RTO update took place. obs_rto_ipaddr will be bogus
5692 sas.sas_maxrto = asoc->stats.max_obs_rto;
5693 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5694 sizeof(struct sockaddr_storage));
5696 /* Mark beginning of a new observation period */
5697 asoc->stats.max_obs_rto = asoc->rto_min;
5699 if (put_user(len, optlen))
5702 SCTP_DEBUG_PRINTK("sctp_getsockopt_assoc_stat(%d): %d\n",
5703 len, sas.sas_assoc_id);
5705 if (copy_to_user(optval, &sas, len))
5711 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5712 char __user *optval, int __user *optlen)
5717 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5720 /* I can hardly begin to describe how wrong this is. This is
5721 * so broken as to be worse than useless. The API draft
5722 * REALLY is NOT helpful here... I am not convinced that the
5723 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5724 * are at all well-founded.
5726 if (level != SOL_SCTP) {
5727 struct sctp_af *af = sctp_sk(sk)->pf->af;
5729 retval = af->getsockopt(sk, level, optname, optval, optlen);
5733 if (get_user(len, optlen))
5740 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5742 case SCTP_DISABLE_FRAGMENTS:
5743 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5747 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5749 case SCTP_AUTOCLOSE:
5750 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5752 case SCTP_SOCKOPT_PEELOFF:
5753 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5755 case SCTP_PEER_ADDR_PARAMS:
5756 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5759 case SCTP_DELAYED_SACK:
5760 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5764 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5766 case SCTP_GET_PEER_ADDRS:
5767 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5770 case SCTP_GET_LOCAL_ADDRS:
5771 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5774 case SCTP_SOCKOPT_CONNECTX3:
5775 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5777 case SCTP_DEFAULT_SEND_PARAM:
5778 retval = sctp_getsockopt_default_send_param(sk, len,
5781 case SCTP_PRIMARY_ADDR:
5782 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5785 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5788 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5790 case SCTP_ASSOCINFO:
5791 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5793 case SCTP_I_WANT_MAPPED_V4_ADDR:
5794 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5797 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5799 case SCTP_GET_PEER_ADDR_INFO:
5800 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5803 case SCTP_ADAPTATION_LAYER:
5804 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5808 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5810 case SCTP_FRAGMENT_INTERLEAVE:
5811 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5814 case SCTP_PARTIAL_DELIVERY_POINT:
5815 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5818 case SCTP_MAX_BURST:
5819 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5822 case SCTP_AUTH_CHUNK:
5823 case SCTP_AUTH_DELETE_KEY:
5824 retval = -EOPNOTSUPP;
5826 case SCTP_HMAC_IDENT:
5827 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5829 case SCTP_AUTH_ACTIVE_KEY:
5830 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5832 case SCTP_PEER_AUTH_CHUNKS:
5833 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5836 case SCTP_LOCAL_AUTH_CHUNKS:
5837 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5840 case SCTP_GET_ASSOC_NUMBER:
5841 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5843 case SCTP_GET_ASSOC_ID_LIST:
5844 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5846 case SCTP_AUTO_ASCONF:
5847 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5849 case SCTP_PEER_ADDR_THLDS:
5850 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
5852 case SCTP_GET_ASSOC_STATS:
5853 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
5856 retval = -ENOPROTOOPT;
5860 sctp_release_sock(sk);
5864 static void sctp_hash(struct sock *sk)
5869 static void sctp_unhash(struct sock *sk)
5874 /* Check if port is acceptable. Possibly find first available port.
5876 * The port hash table (contained in the 'global' SCTP protocol storage
5877 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5878 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5879 * list (the list number is the port number hashed out, so as you
5880 * would expect from a hash function, all the ports in a given list have
5881 * such a number that hashes out to the same list number; you were
5882 * expecting that, right?); so each list has a set of ports, with a
5883 * link to the socket (struct sock) that uses it, the port number and
5884 * a fastreuse flag (FIXME: NPI ipg).
5886 static struct sctp_bind_bucket *sctp_bucket_create(
5887 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
5889 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5891 struct sctp_bind_hashbucket *head; /* hash list */
5892 struct sctp_bind_bucket *pp;
5893 unsigned short snum;
5896 snum = ntohs(addr->v4.sin_port);
5898 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5899 sctp_local_bh_disable();
5902 /* Search for an available port. */
5903 int low, high, remaining, index;
5906 inet_get_local_port_range(&low, &high);
5907 remaining = (high - low) + 1;
5908 rover = net_random() % remaining + low;
5912 if ((rover < low) || (rover > high))
5914 if (inet_is_reserved_local_port(rover))
5916 index = sctp_phashfn(sock_net(sk), rover);
5917 head = &sctp_port_hashtable[index];
5918 sctp_spin_lock(&head->lock);
5919 sctp_for_each_hentry(pp, &head->chain)
5920 if ((pp->port == rover) &&
5921 net_eq(sock_net(sk), pp->net))
5925 sctp_spin_unlock(&head->lock);
5926 } while (--remaining > 0);
5928 /* Exhausted local port range during search? */
5933 /* OK, here is the one we will use. HEAD (the port
5934 * hash table list entry) is non-NULL and we hold it's
5939 /* We are given an specific port number; we verify
5940 * that it is not being used. If it is used, we will
5941 * exahust the search in the hash list corresponding
5942 * to the port number (snum) - we detect that with the
5943 * port iterator, pp being NULL.
5945 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
5946 sctp_spin_lock(&head->lock);
5947 sctp_for_each_hentry(pp, &head->chain) {
5948 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
5955 if (!hlist_empty(&pp->owner)) {
5956 /* We had a port hash table hit - there is an
5957 * available port (pp != NULL) and it is being
5958 * used by other socket (pp->owner not empty); that other
5959 * socket is going to be sk2.
5961 int reuse = sk->sk_reuse;
5964 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5965 if (pp->fastreuse && sk->sk_reuse &&
5966 sk->sk_state != SCTP_SS_LISTENING)
5969 /* Run through the list of sockets bound to the port
5970 * (pp->port) [via the pointers bind_next and
5971 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5972 * we get the endpoint they describe and run through
5973 * the endpoint's list of IP (v4 or v6) addresses,
5974 * comparing each of the addresses with the address of
5975 * the socket sk. If we find a match, then that means
5976 * that this port/socket (sk) combination are already
5979 sk_for_each_bound(sk2, &pp->owner) {
5980 struct sctp_endpoint *ep2;
5981 ep2 = sctp_sk(sk2)->ep;
5984 (reuse && sk2->sk_reuse &&
5985 sk2->sk_state != SCTP_SS_LISTENING))
5988 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5989 sctp_sk(sk2), sctp_sk(sk))) {
5994 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5997 /* If there was a hash table miss, create a new port. */
5999 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6002 /* In either case (hit or miss), make sure fastreuse is 1 only
6003 * if sk->sk_reuse is too (that is, if the caller requested
6004 * SO_REUSEADDR on this socket -sk-).
6006 if (hlist_empty(&pp->owner)) {
6007 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6011 } else if (pp->fastreuse &&
6012 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6015 /* We are set, so fill up all the data in the hash table
6016 * entry, tie the socket list information with the rest of the
6017 * sockets FIXME: Blurry, NPI (ipg).
6020 if (!sctp_sk(sk)->bind_hash) {
6021 inet_sk(sk)->inet_num = snum;
6022 sk_add_bind_node(sk, &pp->owner);
6023 sctp_sk(sk)->bind_hash = pp;
6028 sctp_spin_unlock(&head->lock);
6031 sctp_local_bh_enable();
6035 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
6036 * port is requested.
6038 static int sctp_get_port(struct sock *sk, unsigned short snum)
6041 union sctp_addr addr;
6042 struct sctp_af *af = sctp_sk(sk)->pf->af;
6044 /* Set up a dummy address struct from the sk. */
6045 af->from_sk(&addr, sk);
6046 addr.v4.sin_port = htons(snum);
6048 /* Note: sk->sk_num gets filled in if ephemeral port request. */
6049 ret = sctp_get_port_local(sk, &addr);
6055 * Move a socket to LISTENING state.
6057 SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
6059 struct sctp_sock *sp = sctp_sk(sk);
6060 struct sctp_endpoint *ep = sp->ep;
6061 struct crypto_hash *tfm = NULL;
6064 /* Allocate HMAC for generating cookie. */
6065 if (!sp->hmac && sp->sctp_hmac_alg) {
6066 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6067 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6069 net_info_ratelimited("failed to load transform for %s: %ld\n",
6070 sp->sctp_hmac_alg, PTR_ERR(tfm));
6073 sctp_sk(sk)->hmac = tfm;
6077 * If a bind() or sctp_bindx() is not called prior to a listen()
6078 * call that allows new associations to be accepted, the system
6079 * picks an ephemeral port and will choose an address set equivalent
6080 * to binding with a wildcard address.
6082 * This is not currently spelled out in the SCTP sockets
6083 * extensions draft, but follows the practice as seen in TCP
6087 sk->sk_state = SCTP_SS_LISTENING;
6088 if (!ep->base.bind_addr.port) {
6089 if (sctp_autobind(sk))
6092 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6093 sk->sk_state = SCTP_SS_CLOSED;
6098 sk->sk_max_ack_backlog = backlog;
6099 sctp_hash_endpoint(ep);
6104 * 4.1.3 / 5.1.3 listen()
6106 * By default, new associations are not accepted for UDP style sockets.
6107 * An application uses listen() to mark a socket as being able to
6108 * accept new associations.
6110 * On TCP style sockets, applications use listen() to ready the SCTP
6111 * endpoint for accepting inbound associations.
6113 * On both types of endpoints a backlog of '0' disables listening.
6115 * Move a socket to LISTENING state.
6117 int sctp_inet_listen(struct socket *sock, int backlog)
6119 struct sock *sk = sock->sk;
6120 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6123 if (unlikely(backlog < 0))
6128 /* Peeled-off sockets are not allowed to listen(). */
6129 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6132 if (sock->state != SS_UNCONNECTED)
6135 /* If backlog is zero, disable listening. */
6137 if (sctp_sstate(sk, CLOSED))
6141 sctp_unhash_endpoint(ep);
6142 sk->sk_state = SCTP_SS_CLOSED;
6144 sctp_sk(sk)->bind_hash->fastreuse = 1;
6148 /* If we are already listening, just update the backlog */
6149 if (sctp_sstate(sk, LISTENING))
6150 sk->sk_max_ack_backlog = backlog;
6152 err = sctp_listen_start(sk, backlog);
6159 sctp_release_sock(sk);
6164 * This function is done by modeling the current datagram_poll() and the
6165 * tcp_poll(). Note that, based on these implementations, we don't
6166 * lock the socket in this function, even though it seems that,
6167 * ideally, locking or some other mechanisms can be used to ensure
6168 * the integrity of the counters (sndbuf and wmem_alloc) used
6169 * in this place. We assume that we don't need locks either until proven
6172 * Another thing to note is that we include the Async I/O support
6173 * here, again, by modeling the current TCP/UDP code. We don't have
6174 * a good way to test with it yet.
6176 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6178 struct sock *sk = sock->sk;
6179 struct sctp_sock *sp = sctp_sk(sk);
6182 poll_wait(file, sk_sleep(sk), wait);
6184 /* A TCP-style listening socket becomes readable when the accept queue
6187 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6188 return (!list_empty(&sp->ep->asocs)) ?
6189 (POLLIN | POLLRDNORM) : 0;
6193 /* Is there any exceptional events? */
6194 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6196 sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
6197 if (sk->sk_shutdown & RCV_SHUTDOWN)
6198 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6199 if (sk->sk_shutdown == SHUTDOWN_MASK)
6202 /* Is it readable? Reconsider this code with TCP-style support. */
6203 if (!skb_queue_empty(&sk->sk_receive_queue))
6204 mask |= POLLIN | POLLRDNORM;
6206 /* The association is either gone or not ready. */
6207 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6210 /* Is it writable? */
6211 if (sctp_writeable(sk)) {
6212 mask |= POLLOUT | POLLWRNORM;
6214 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6216 * Since the socket is not locked, the buffer
6217 * might be made available after the writeable check and
6218 * before the bit is set. This could cause a lost I/O
6219 * signal. tcp_poll() has a race breaker for this race
6220 * condition. Based on their implementation, we put
6221 * in the following code to cover it as well.
6223 if (sctp_writeable(sk))
6224 mask |= POLLOUT | POLLWRNORM;
6229 /********************************************************************
6230 * 2nd Level Abstractions
6231 ********************************************************************/
6233 static struct sctp_bind_bucket *sctp_bucket_create(
6234 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6236 struct sctp_bind_bucket *pp;
6238 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6240 SCTP_DBG_OBJCNT_INC(bind_bucket);
6243 INIT_HLIST_HEAD(&pp->owner);
6245 hlist_add_head(&pp->node, &head->chain);
6250 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6251 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6253 if (pp && hlist_empty(&pp->owner)) {
6254 __hlist_del(&pp->node);
6255 kmem_cache_free(sctp_bucket_cachep, pp);
6256 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6260 /* Release this socket's reference to a local port. */
6261 static inline void __sctp_put_port(struct sock *sk)
6263 struct sctp_bind_hashbucket *head =
6264 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6265 inet_sk(sk)->inet_num)];
6266 struct sctp_bind_bucket *pp;
6268 sctp_spin_lock(&head->lock);
6269 pp = sctp_sk(sk)->bind_hash;
6270 __sk_del_bind_node(sk);
6271 sctp_sk(sk)->bind_hash = NULL;
6272 inet_sk(sk)->inet_num = 0;
6273 sctp_bucket_destroy(pp);
6274 sctp_spin_unlock(&head->lock);
6277 void sctp_put_port(struct sock *sk)
6279 sctp_local_bh_disable();
6280 __sctp_put_port(sk);
6281 sctp_local_bh_enable();
6285 * The system picks an ephemeral port and choose an address set equivalent
6286 * to binding with a wildcard address.
6287 * One of those addresses will be the primary address for the association.
6288 * This automatically enables the multihoming capability of SCTP.
6290 static int sctp_autobind(struct sock *sk)
6292 union sctp_addr autoaddr;
6296 /* Initialize a local sockaddr structure to INADDR_ANY. */
6297 af = sctp_sk(sk)->pf->af;
6299 port = htons(inet_sk(sk)->inet_num);
6300 af->inaddr_any(&autoaddr, port);
6302 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6305 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6308 * 4.2 The cmsghdr Structure *
6310 * When ancillary data is sent or received, any number of ancillary data
6311 * objects can be specified by the msg_control and msg_controllen members of
6312 * the msghdr structure, because each object is preceded by
6313 * a cmsghdr structure defining the object's length (the cmsg_len member).
6314 * Historically Berkeley-derived implementations have passed only one object
6315 * at a time, but this API allows multiple objects to be
6316 * passed in a single call to sendmsg() or recvmsg(). The following example
6317 * shows two ancillary data objects in a control buffer.
6319 * |<--------------------------- msg_controllen -------------------------->|
6322 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6324 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6327 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6329 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6332 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6333 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6335 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6337 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6344 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6345 sctp_cmsgs_t *cmsgs)
6347 struct cmsghdr *cmsg;
6348 struct msghdr *my_msg = (struct msghdr *)msg;
6350 for (cmsg = CMSG_FIRSTHDR(msg);
6352 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6353 if (!CMSG_OK(my_msg, cmsg))
6356 /* Should we parse this header or ignore? */
6357 if (cmsg->cmsg_level != IPPROTO_SCTP)
6360 /* Strictly check lengths following example in SCM code. */
6361 switch (cmsg->cmsg_type) {
6363 /* SCTP Socket API Extension
6364 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6366 * This cmsghdr structure provides information for
6367 * initializing new SCTP associations with sendmsg().
6368 * The SCTP_INITMSG socket option uses this same data
6369 * structure. This structure is not used for
6372 * cmsg_level cmsg_type cmsg_data[]
6373 * ------------ ------------ ----------------------
6374 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6376 if (cmsg->cmsg_len !=
6377 CMSG_LEN(sizeof(struct sctp_initmsg)))
6379 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6383 /* SCTP Socket API Extension
6384 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6386 * This cmsghdr structure specifies SCTP options for
6387 * sendmsg() and describes SCTP header information
6388 * about a received message through recvmsg().
6390 * cmsg_level cmsg_type cmsg_data[]
6391 * ------------ ------------ ----------------------
6392 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6394 if (cmsg->cmsg_len !=
6395 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6399 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6401 /* Minimally, validate the sinfo_flags. */
6402 if (cmsgs->info->sinfo_flags &
6403 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6404 SCTP_ABORT | SCTP_EOF))
6416 * Wait for a packet..
6417 * Note: This function is the same function as in core/datagram.c
6418 * with a few modifications to make lksctp work.
6420 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6425 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6427 /* Socket errors? */
6428 error = sock_error(sk);
6432 if (!skb_queue_empty(&sk->sk_receive_queue))
6435 /* Socket shut down? */
6436 if (sk->sk_shutdown & RCV_SHUTDOWN)
6439 /* Sequenced packets can come disconnected. If so we report the
6444 /* Is there a good reason to think that we may receive some data? */
6445 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6448 /* Handle signals. */
6449 if (signal_pending(current))
6452 /* Let another process have a go. Since we are going to sleep
6453 * anyway. Note: This may cause odd behaviors if the message
6454 * does not fit in the user's buffer, but this seems to be the
6455 * only way to honor MSG_DONTWAIT realistically.
6457 sctp_release_sock(sk);
6458 *timeo_p = schedule_timeout(*timeo_p);
6462 finish_wait(sk_sleep(sk), &wait);
6466 error = sock_intr_errno(*timeo_p);
6469 finish_wait(sk_sleep(sk), &wait);
6474 /* Receive a datagram.
6475 * Note: This is pretty much the same routine as in core/datagram.c
6476 * with a few changes to make lksctp work.
6478 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6479 int noblock, int *err)
6482 struct sk_buff *skb;
6485 timeo = sock_rcvtimeo(sk, noblock);
6487 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6488 timeo, MAX_SCHEDULE_TIMEOUT);
6491 /* Again only user level code calls this function,
6492 * so nothing interrupt level
6493 * will suddenly eat the receive_queue.
6495 * Look at current nfs client by the way...
6496 * However, this function was correct in any case. 8)
6498 if (flags & MSG_PEEK) {
6499 spin_lock_bh(&sk->sk_receive_queue.lock);
6500 skb = skb_peek(&sk->sk_receive_queue);
6502 atomic_inc(&skb->users);
6503 spin_unlock_bh(&sk->sk_receive_queue.lock);
6505 skb = skb_dequeue(&sk->sk_receive_queue);
6511 /* Caller is allowed not to check sk->sk_err before calling. */
6512 error = sock_error(sk);
6516 if (sk->sk_shutdown & RCV_SHUTDOWN)
6519 /* User doesn't want to wait. */
6523 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6532 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6533 static void __sctp_write_space(struct sctp_association *asoc)
6535 struct sock *sk = asoc->base.sk;
6536 struct socket *sock = sk->sk_socket;
6538 if ((sctp_wspace(asoc) > 0) && sock) {
6539 if (waitqueue_active(&asoc->wait))
6540 wake_up_interruptible(&asoc->wait);
6542 if (sctp_writeable(sk)) {
6543 wait_queue_head_t *wq = sk_sleep(sk);
6545 if (wq && waitqueue_active(wq))
6546 wake_up_interruptible(wq);
6548 /* Note that we try to include the Async I/O support
6549 * here by modeling from the current TCP/UDP code.
6550 * We have not tested with it yet.
6552 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6553 sock_wake_async(sock,
6554 SOCK_WAKE_SPACE, POLL_OUT);
6559 /* Do accounting for the sndbuf space.
6560 * Decrement the used sndbuf space of the corresponding association by the
6561 * data size which was just transmitted(freed).
6563 static void sctp_wfree(struct sk_buff *skb)
6565 struct sctp_association *asoc;
6566 struct sctp_chunk *chunk;
6569 /* Get the saved chunk pointer. */
6570 chunk = *((struct sctp_chunk **)(skb->cb));
6573 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6574 sizeof(struct sk_buff) +
6575 sizeof(struct sctp_chunk);
6577 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6580 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6582 sk->sk_wmem_queued -= skb->truesize;
6583 sk_mem_uncharge(sk, skb->truesize);
6586 __sctp_write_space(asoc);
6588 sctp_association_put(asoc);
6591 /* Do accounting for the receive space on the socket.
6592 * Accounting for the association is done in ulpevent.c
6593 * We set this as a destructor for the cloned data skbs so that
6594 * accounting is done at the correct time.
6596 void sctp_sock_rfree(struct sk_buff *skb)
6598 struct sock *sk = skb->sk;
6599 struct sctp_ulpevent *event = sctp_skb2event(skb);
6601 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6604 * Mimic the behavior of sock_rfree
6606 sk_mem_uncharge(sk, event->rmem_len);
6610 /* Helper function to wait for space in the sndbuf. */
6611 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6614 struct sock *sk = asoc->base.sk;
6616 long current_timeo = *timeo_p;
6619 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6620 asoc, (long)(*timeo_p), msg_len);
6622 /* Increment the association's refcnt. */
6623 sctp_association_hold(asoc);
6625 /* Wait on the association specific sndbuf space. */
6627 prepare_to_wait_exclusive(&asoc->wait, &wait,
6628 TASK_INTERRUPTIBLE);
6631 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6634 if (signal_pending(current))
6635 goto do_interrupted;
6636 if (msg_len <= sctp_wspace(asoc))
6639 /* Let another process have a go. Since we are going
6642 sctp_release_sock(sk);
6643 current_timeo = schedule_timeout(current_timeo);
6644 BUG_ON(sk != asoc->base.sk);
6647 *timeo_p = current_timeo;
6651 finish_wait(&asoc->wait, &wait);
6653 /* Release the association's refcnt. */
6654 sctp_association_put(asoc);
6663 err = sock_intr_errno(*timeo_p);
6671 void sctp_data_ready(struct sock *sk, int len)
6673 struct socket_wq *wq;
6676 wq = rcu_dereference(sk->sk_wq);
6677 if (wq_has_sleeper(wq))
6678 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6679 POLLRDNORM | POLLRDBAND);
6680 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6684 /* If socket sndbuf has changed, wake up all per association waiters. */
6685 void sctp_write_space(struct sock *sk)
6687 struct sctp_association *asoc;
6689 /* Wake up the tasks in each wait queue. */
6690 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6691 __sctp_write_space(asoc);
6695 /* Is there any sndbuf space available on the socket?
6697 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6698 * associations on the same socket. For a UDP-style socket with
6699 * multiple associations, it is possible for it to be "unwriteable"
6700 * prematurely. I assume that this is acceptable because
6701 * a premature "unwriteable" is better than an accidental "writeable" which
6702 * would cause an unwanted block under certain circumstances. For the 1-1
6703 * UDP-style sockets or TCP-style sockets, this code should work.
6706 static int sctp_writeable(struct sock *sk)
6710 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
6716 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6717 * returns immediately with EINPROGRESS.
6719 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6721 struct sock *sk = asoc->base.sk;
6723 long current_timeo = *timeo_p;
6726 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6729 /* Increment the association's refcnt. */
6730 sctp_association_hold(asoc);
6733 prepare_to_wait_exclusive(&asoc->wait, &wait,
6734 TASK_INTERRUPTIBLE);
6737 if (sk->sk_shutdown & RCV_SHUTDOWN)
6739 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6742 if (signal_pending(current))
6743 goto do_interrupted;
6745 if (sctp_state(asoc, ESTABLISHED))
6748 /* Let another process have a go. Since we are going
6751 sctp_release_sock(sk);
6752 current_timeo = schedule_timeout(current_timeo);
6755 *timeo_p = current_timeo;
6759 finish_wait(&asoc->wait, &wait);
6761 /* Release the association's refcnt. */
6762 sctp_association_put(asoc);
6767 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6770 err = -ECONNREFUSED;
6774 err = sock_intr_errno(*timeo_p);
6782 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6784 struct sctp_endpoint *ep;
6788 ep = sctp_sk(sk)->ep;
6792 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
6793 TASK_INTERRUPTIBLE);
6795 if (list_empty(&ep->asocs)) {
6796 sctp_release_sock(sk);
6797 timeo = schedule_timeout(timeo);
6802 if (!sctp_sstate(sk, LISTENING))
6806 if (!list_empty(&ep->asocs))
6809 err = sock_intr_errno(timeo);
6810 if (signal_pending(current))
6818 finish_wait(sk_sleep(sk), &wait);
6823 static void sctp_wait_for_close(struct sock *sk, long timeout)
6828 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6829 if (list_empty(&sctp_sk(sk)->ep->asocs))
6831 sctp_release_sock(sk);
6832 timeout = schedule_timeout(timeout);
6834 } while (!signal_pending(current) && timeout);
6836 finish_wait(sk_sleep(sk), &wait);
6839 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6841 struct sk_buff *frag;
6846 /* Don't forget the fragments. */
6847 skb_walk_frags(skb, frag)
6848 sctp_skb_set_owner_r_frag(frag, sk);
6851 sctp_skb_set_owner_r(skb, sk);
6854 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6855 struct sctp_association *asoc)
6857 struct inet_sock *inet = inet_sk(sk);
6858 struct inet_sock *newinet;
6860 newsk->sk_type = sk->sk_type;
6861 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6862 newsk->sk_flags = sk->sk_flags;
6863 newsk->sk_no_check = sk->sk_no_check;
6864 newsk->sk_reuse = sk->sk_reuse;
6866 newsk->sk_shutdown = sk->sk_shutdown;
6867 newsk->sk_destruct = inet_sock_destruct;
6868 newsk->sk_family = sk->sk_family;
6869 newsk->sk_protocol = IPPROTO_SCTP;
6870 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6871 newsk->sk_sndbuf = sk->sk_sndbuf;
6872 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6873 newsk->sk_lingertime = sk->sk_lingertime;
6874 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6875 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6877 newinet = inet_sk(newsk);
6879 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6880 * getsockname() and getpeername()
6882 newinet->inet_sport = inet->inet_sport;
6883 newinet->inet_saddr = inet->inet_saddr;
6884 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6885 newinet->inet_dport = htons(asoc->peer.port);
6886 newinet->pmtudisc = inet->pmtudisc;
6887 newinet->inet_id = asoc->next_tsn ^ jiffies;
6889 newinet->uc_ttl = inet->uc_ttl;
6890 newinet->mc_loop = 1;
6891 newinet->mc_ttl = 1;
6892 newinet->mc_index = 0;
6893 newinet->mc_list = NULL;
6896 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6897 * and its messages to the newsk.
6899 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6900 struct sctp_association *assoc,
6901 sctp_socket_type_t type)
6903 struct sctp_sock *oldsp = sctp_sk(oldsk);
6904 struct sctp_sock *newsp = sctp_sk(newsk);
6905 struct sctp_bind_bucket *pp; /* hash list port iterator */
6906 struct sctp_endpoint *newep = newsp->ep;
6907 struct sk_buff *skb, *tmp;
6908 struct sctp_ulpevent *event;
6909 struct sctp_bind_hashbucket *head;
6910 struct list_head tmplist;
6912 /* Migrate socket buffer sizes and all the socket level options to the
6915 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6916 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6917 /* Brute force copy old sctp opt. */
6918 if (oldsp->do_auto_asconf) {
6919 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
6920 inet_sk_copy_descendant(newsk, oldsk);
6921 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
6923 inet_sk_copy_descendant(newsk, oldsk);
6925 /* Restore the ep value that was overwritten with the above structure
6931 /* Hook this new socket in to the bind_hash list. */
6932 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
6933 inet_sk(oldsk)->inet_num)];
6934 sctp_local_bh_disable();
6935 sctp_spin_lock(&head->lock);
6936 pp = sctp_sk(oldsk)->bind_hash;
6937 sk_add_bind_node(newsk, &pp->owner);
6938 sctp_sk(newsk)->bind_hash = pp;
6939 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
6940 sctp_spin_unlock(&head->lock);
6941 sctp_local_bh_enable();
6943 /* Copy the bind_addr list from the original endpoint to the new
6944 * endpoint so that we can handle restarts properly
6946 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6947 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6949 /* Move any messages in the old socket's receive queue that are for the
6950 * peeled off association to the new socket's receive queue.
6952 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6953 event = sctp_skb2event(skb);
6954 if (event->asoc == assoc) {
6955 __skb_unlink(skb, &oldsk->sk_receive_queue);
6956 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6957 sctp_skb_set_owner_r_frag(skb, newsk);
6961 /* Clean up any messages pending delivery due to partial
6962 * delivery. Three cases:
6963 * 1) No partial deliver; no work.
6964 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6965 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6967 skb_queue_head_init(&newsp->pd_lobby);
6968 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6970 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6971 struct sk_buff_head *queue;
6973 /* Decide which queue to move pd_lobby skbs to. */
6974 if (assoc->ulpq.pd_mode) {
6975 queue = &newsp->pd_lobby;
6977 queue = &newsk->sk_receive_queue;
6979 /* Walk through the pd_lobby, looking for skbs that
6980 * need moved to the new socket.
6982 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6983 event = sctp_skb2event(skb);
6984 if (event->asoc == assoc) {
6985 __skb_unlink(skb, &oldsp->pd_lobby);
6986 __skb_queue_tail(queue, skb);
6987 sctp_skb_set_owner_r_frag(skb, newsk);
6991 /* Clear up any skbs waiting for the partial
6992 * delivery to finish.
6994 if (assoc->ulpq.pd_mode)
6995 sctp_clear_pd(oldsk, NULL);
6999 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
7000 sctp_skb_set_owner_r_frag(skb, newsk);
7002 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
7003 sctp_skb_set_owner_r_frag(skb, newsk);
7005 /* Set the type of socket to indicate that it is peeled off from the
7006 * original UDP-style socket or created with the accept() call on a
7007 * TCP-style socket..
7011 /* Mark the new socket "in-use" by the user so that any packets
7012 * that may arrive on the association after we've moved it are
7013 * queued to the backlog. This prevents a potential race between
7014 * backlog processing on the old socket and new-packet processing
7015 * on the new socket.
7017 * The caller has just allocated newsk so we can guarantee that other
7018 * paths won't try to lock it and then oldsk.
7020 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
7021 sctp_assoc_migrate(assoc, newsk);
7023 /* If the association on the newsk is already closed before accept()
7024 * is called, set RCV_SHUTDOWN flag.
7026 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
7027 newsk->sk_shutdown |= RCV_SHUTDOWN;
7029 newsk->sk_state = SCTP_SS_ESTABLISHED;
7030 sctp_release_sock(newsk);
7034 /* This proto struct describes the ULP interface for SCTP. */
7035 struct proto sctp_prot = {
7037 .owner = THIS_MODULE,
7038 .close = sctp_close,
7039 .connect = sctp_connect,
7040 .disconnect = sctp_disconnect,
7041 .accept = sctp_accept,
7042 .ioctl = sctp_ioctl,
7043 .init = sctp_init_sock,
7044 .destroy = sctp_destroy_sock,
7045 .shutdown = sctp_shutdown,
7046 .setsockopt = sctp_setsockopt,
7047 .getsockopt = sctp_getsockopt,
7048 .sendmsg = sctp_sendmsg,
7049 .recvmsg = sctp_recvmsg,
7051 .backlog_rcv = sctp_backlog_rcv,
7053 .unhash = sctp_unhash,
7054 .get_port = sctp_get_port,
7055 .obj_size = sizeof(struct sctp_sock),
7056 .sysctl_mem = sysctl_sctp_mem,
7057 .sysctl_rmem = sysctl_sctp_rmem,
7058 .sysctl_wmem = sysctl_sctp_wmem,
7059 .memory_pressure = &sctp_memory_pressure,
7060 .enter_memory_pressure = sctp_enter_memory_pressure,
7061 .memory_allocated = &sctp_memory_allocated,
7062 .sockets_allocated = &sctp_sockets_allocated,
7065 #if IS_ENABLED(CONFIG_IPV6)
7067 struct proto sctpv6_prot = {
7069 .owner = THIS_MODULE,
7070 .close = sctp_close,
7071 .connect = sctp_connect,
7072 .disconnect = sctp_disconnect,
7073 .accept = sctp_accept,
7074 .ioctl = sctp_ioctl,
7075 .init = sctp_init_sock,
7076 .destroy = sctp_destroy_sock,
7077 .shutdown = sctp_shutdown,
7078 .setsockopt = sctp_setsockopt,
7079 .getsockopt = sctp_getsockopt,
7080 .sendmsg = sctp_sendmsg,
7081 .recvmsg = sctp_recvmsg,
7083 .backlog_rcv = sctp_backlog_rcv,
7085 .unhash = sctp_unhash,
7086 .get_port = sctp_get_port,
7087 .obj_size = sizeof(struct sctp6_sock),
7088 .sysctl_mem = sysctl_sctp_mem,
7089 .sysctl_rmem = sysctl_sctp_rmem,
7090 .sysctl_wmem = sysctl_sctp_wmem,
7091 .memory_pressure = &sctp_memory_pressure,
7092 .enter_memory_pressure = sctp_enter_memory_pressure,
7093 .memory_allocated = &sctp_memory_allocated,
7094 .sockets_allocated = &sctp_sockets_allocated,
7096 #endif /* IS_ENABLED(CONFIG_IPV6) */