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>
76 #include <net/route.h>
78 #include <net/inet_common.h>
80 #include <linux/socket.h> /* for sa_family_t */
81 #include <linux/export.h>
83 #include <net/sctp/sctp.h>
84 #include <net/sctp/sm.h>
86 /* WARNING: Please do not remove the SCTP_STATIC attribute to
87 * any of the functions below as they are used to export functions
88 * used by a project regression testsuite.
91 /* Forward declarations for internal helper functions. */
92 static int sctp_writeable(struct sock *sk);
93 static void sctp_wfree(struct sk_buff *skb);
94 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
96 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
97 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
98 static int sctp_wait_for_accept(struct sock *sk, long timeo);
99 static void sctp_wait_for_close(struct sock *sk, long timeo);
100 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
101 union sctp_addr *addr, int len);
102 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
103 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
104 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
105 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
106 static int sctp_send_asconf(struct sctp_association *asoc,
107 struct sctp_chunk *chunk);
108 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
109 static int sctp_autobind(struct sock *sk);
110 static void sctp_sock_migrate(struct sock *, struct sock *,
111 struct sctp_association *, sctp_socket_type_t);
112 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
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 sctp_sock *sp = sctp_sk(sk);
339 struct sctp_endpoint *ep = sp->ep;
340 struct sctp_bind_addr *bp = &ep->base.bind_addr;
345 /* Common sockaddr verification. */
346 af = sctp_sockaddr_af(sp, addr, len);
348 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
353 snum = ntohs(addr->v4.sin_port);
355 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
356 ", port: %d, new port: %d, len: %d)\n",
362 /* PF specific bind() address verification. */
363 if (!sp->pf->bind_verify(sp, addr))
364 return -EADDRNOTAVAIL;
366 /* We must either be unbound, or bind to the same port.
367 * It's OK to allow 0 ports if we are already bound.
368 * We'll just inhert an already bound port in this case
373 else if (snum != bp->port) {
374 SCTP_DEBUG_PRINTK("sctp_do_bind:"
375 " New port %d does not match existing port "
376 "%d.\n", snum, bp->port);
381 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
384 /* See if the address matches any of the addresses we may have
385 * already bound before checking against other endpoints.
387 if (sctp_bind_addr_match(bp, addr, sp))
390 /* Make sure we are allowed to bind here.
391 * The function sctp_get_port_local() does duplicate address
394 addr->v4.sin_port = htons(snum);
395 if ((ret = sctp_get_port_local(sk, addr))) {
399 /* Refresh ephemeral port. */
401 bp->port = inet_sk(sk)->inet_num;
403 /* Add the address to the bind address list.
404 * Use GFP_ATOMIC since BHs will be disabled.
406 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
408 /* Copy back into socket for getsockname() use. */
410 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
411 af->to_sk_saddr(addr, sk);
417 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
419 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
420 * at any one time. If a sender, after sending an ASCONF chunk, decides
421 * it needs to transfer another ASCONF Chunk, it MUST wait until the
422 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
423 * subsequent ASCONF. Note this restriction binds each side, so at any
424 * time two ASCONF may be in-transit on any given association (one sent
425 * from each endpoint).
427 static int sctp_send_asconf(struct sctp_association *asoc,
428 struct sctp_chunk *chunk)
432 /* If there is an outstanding ASCONF chunk, queue it for later
435 if (asoc->addip_last_asconf) {
436 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
440 /* Hold the chunk until an ASCONF_ACK is received. */
441 sctp_chunk_hold(chunk);
442 retval = sctp_primitive_ASCONF(asoc, chunk);
444 sctp_chunk_free(chunk);
446 asoc->addip_last_asconf = chunk;
452 /* Add a list of addresses as bind addresses to local endpoint or
455 * Basically run through each address specified in the addrs/addrcnt
456 * array/length pair, determine if it is IPv6 or IPv4 and call
457 * sctp_do_bind() on it.
459 * If any of them fails, then the operation will be reversed and the
460 * ones that were added will be removed.
462 * Only sctp_setsockopt_bindx() is supposed to call this function.
464 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
469 struct sockaddr *sa_addr;
472 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
476 for (cnt = 0; cnt < addrcnt; cnt++) {
477 /* The list may contain either IPv4 or IPv6 address;
478 * determine the address length for walking thru the list.
481 af = sctp_get_af_specific(sa_addr->sa_family);
487 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
490 addr_buf += af->sockaddr_len;
494 /* Failed. Cleanup the ones that have been added */
496 sctp_bindx_rem(sk, addrs, cnt);
504 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
505 * associations that are part of the endpoint indicating that a list of local
506 * addresses are added to the endpoint.
508 * If any of the addresses is already in the bind address list of the
509 * association, we do not send the chunk for that association. But it will not
510 * affect other associations.
512 * Only sctp_setsockopt_bindx() is supposed to call this function.
514 static int sctp_send_asconf_add_ip(struct sock *sk,
515 struct sockaddr *addrs,
518 struct sctp_sock *sp;
519 struct sctp_endpoint *ep;
520 struct sctp_association *asoc;
521 struct sctp_bind_addr *bp;
522 struct sctp_chunk *chunk;
523 struct sctp_sockaddr_entry *laddr;
524 union sctp_addr *addr;
525 union sctp_addr saveaddr;
532 if (!sctp_addip_enable)
538 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
539 __func__, sk, addrs, addrcnt);
541 list_for_each_entry(asoc, &ep->asocs, asocs) {
543 if (!asoc->peer.asconf_capable)
546 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
549 if (!sctp_state(asoc, ESTABLISHED))
552 /* Check if any address in the packed array of addresses is
553 * in the bind address list of the association. If so,
554 * do not send the asconf chunk to its peer, but continue with
555 * other associations.
558 for (i = 0; i < addrcnt; i++) {
560 af = sctp_get_af_specific(addr->v4.sin_family);
566 if (sctp_assoc_lookup_laddr(asoc, addr))
569 addr_buf += af->sockaddr_len;
574 /* Use the first valid address in bind addr list of
575 * association as Address Parameter of ASCONF CHUNK.
577 bp = &asoc->base.bind_addr;
578 p = bp->address_list.next;
579 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
580 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
581 addrcnt, SCTP_PARAM_ADD_IP);
587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
591 for (i = 0; i < addrcnt; i++) {
593 af = sctp_get_af_specific(addr->v4.sin_family);
594 memcpy(&saveaddr, addr, af->sockaddr_len);
595 retval = sctp_add_bind_addr(bp, &saveaddr,
596 SCTP_ADDR_NEW, GFP_ATOMIC);
597 addr_buf += af->sockaddr_len;
599 if (asoc->src_out_of_asoc_ok) {
600 struct sctp_transport *trans;
602 list_for_each_entry(trans,
603 &asoc->peer.transport_addr_list, transports) {
604 /* Clear the source and route cache */
605 dst_release(trans->dst);
606 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
607 2*asoc->pathmtu, 4380));
608 trans->ssthresh = asoc->peer.i.a_rwnd;
609 trans->rto = asoc->rto_initial;
610 trans->rtt = trans->srtt = trans->rttvar = 0;
611 sctp_transport_route(trans, NULL,
612 sctp_sk(asoc->base.sk));
615 retval = sctp_send_asconf(asoc, chunk);
622 /* Remove a list of addresses from bind addresses list. Do not remove the
625 * Basically run through each address specified in the addrs/addrcnt
626 * array/length pair, determine if it is IPv6 or IPv4 and call
627 * sctp_del_bind() on it.
629 * If any of them fails, then the operation will be reversed and the
630 * ones that were removed will be added back.
632 * At least one address has to be left; if only one address is
633 * available, the operation will return -EBUSY.
635 * Only sctp_setsockopt_bindx() is supposed to call this function.
637 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
639 struct sctp_sock *sp = sctp_sk(sk);
640 struct sctp_endpoint *ep = sp->ep;
642 struct sctp_bind_addr *bp = &ep->base.bind_addr;
645 union sctp_addr *sa_addr;
648 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
652 for (cnt = 0; cnt < addrcnt; cnt++) {
653 /* If the bind address list is empty or if there is only one
654 * bind address, there is nothing more to be removed (we need
655 * at least one address here).
657 if (list_empty(&bp->address_list) ||
658 (sctp_list_single_entry(&bp->address_list))) {
664 af = sctp_get_af_specific(sa_addr->sa.sa_family);
670 if (!af->addr_valid(sa_addr, sp, NULL)) {
671 retval = -EADDRNOTAVAIL;
675 if (sa_addr->v4.sin_port &&
676 sa_addr->v4.sin_port != htons(bp->port)) {
681 if (!sa_addr->v4.sin_port)
682 sa_addr->v4.sin_port = htons(bp->port);
684 /* FIXME - There is probably a need to check if sk->sk_saddr and
685 * sk->sk_rcv_addr are currently set to one of the addresses to
686 * be removed. This is something which needs to be looked into
687 * when we are fixing the outstanding issues with multi-homing
688 * socket routing and failover schemes. Refer to comments in
689 * sctp_do_bind(). -daisy
691 retval = sctp_del_bind_addr(bp, sa_addr);
693 addr_buf += af->sockaddr_len;
696 /* Failed. Add the ones that has been removed back */
698 sctp_bindx_add(sk, addrs, cnt);
706 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
707 * the associations that are part of the endpoint indicating that a list of
708 * local addresses are removed from the endpoint.
710 * If any of the addresses is already in the bind address list of the
711 * association, we do not send the chunk for that association. But it will not
712 * affect other associations.
714 * Only sctp_setsockopt_bindx() is supposed to call this function.
716 static int sctp_send_asconf_del_ip(struct sock *sk,
717 struct sockaddr *addrs,
720 struct sctp_sock *sp;
721 struct sctp_endpoint *ep;
722 struct sctp_association *asoc;
723 struct sctp_transport *transport;
724 struct sctp_bind_addr *bp;
725 struct sctp_chunk *chunk;
726 union sctp_addr *laddr;
729 struct sctp_sockaddr_entry *saddr;
735 if (!sctp_addip_enable)
741 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
742 __func__, sk, addrs, addrcnt);
744 list_for_each_entry(asoc, &ep->asocs, asocs) {
746 if (!asoc->peer.asconf_capable)
749 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
752 if (!sctp_state(asoc, ESTABLISHED))
755 /* Check if any address in the packed array of addresses is
756 * not present in the bind address list of the association.
757 * If so, do not send the asconf chunk to its peer, but
758 * continue with other associations.
761 for (i = 0; i < addrcnt; i++) {
763 af = sctp_get_af_specific(laddr->v4.sin_family);
769 if (!sctp_assoc_lookup_laddr(asoc, laddr))
772 addr_buf += af->sockaddr_len;
777 /* Find one address in the association's bind address list
778 * that is not in the packed array of addresses. This is to
779 * make sure that we do not delete all the addresses in the
782 bp = &asoc->base.bind_addr;
783 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
785 if ((laddr == NULL) && (addrcnt == 1)) {
786 if (asoc->asconf_addr_del_pending)
788 asoc->asconf_addr_del_pending =
789 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
790 if (asoc->asconf_addr_del_pending == NULL) {
794 asoc->asconf_addr_del_pending->sa.sa_family =
796 asoc->asconf_addr_del_pending->v4.sin_port =
798 if (addrs->sa_family == AF_INET) {
799 struct sockaddr_in *sin;
801 sin = (struct sockaddr_in *)addrs;
802 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
803 } else if (addrs->sa_family == AF_INET6) {
804 struct sockaddr_in6 *sin6;
806 sin6 = (struct sockaddr_in6 *)addrs;
807 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
809 SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
810 " at %p\n", asoc, asoc->asconf_addr_del_pending,
811 asoc->asconf_addr_del_pending);
812 asoc->src_out_of_asoc_ok = 1;
817 /* We do not need RCU protection throughout this loop
818 * because this is done under a socket lock from the
821 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
829 /* Reset use_as_src flag for the addresses in the bind address
830 * list that are to be deleted.
833 for (i = 0; i < addrcnt; i++) {
835 af = sctp_get_af_specific(laddr->v4.sin_family);
836 list_for_each_entry(saddr, &bp->address_list, list) {
837 if (sctp_cmp_addr_exact(&saddr->a, laddr))
838 saddr->state = SCTP_ADDR_DEL;
840 addr_buf += af->sockaddr_len;
843 /* Update the route and saddr entries for all the transports
844 * as some of the addresses in the bind address list are
845 * about to be deleted and cannot be used as source addresses.
847 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
849 dst_release(transport->dst);
850 sctp_transport_route(transport, NULL,
851 sctp_sk(asoc->base.sk));
855 /* We don't need to transmit ASCONF */
857 retval = sctp_send_asconf(asoc, chunk);
863 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
864 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
866 struct sock *sk = sctp_opt2sk(sp);
867 union sctp_addr *addr;
870 /* It is safe to write port space in caller. */
872 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
873 af = sctp_get_af_specific(addr->sa.sa_family);
876 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
879 if (addrw->state == SCTP_ADDR_NEW)
880 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
882 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
885 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
888 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
891 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
892 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
895 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
896 * Section 3.1.2 for this usage.
898 * addrs is a pointer to an array of one or more socket addresses. Each
899 * address is contained in its appropriate structure (i.e. struct
900 * sockaddr_in or struct sockaddr_in6) the family of the address type
901 * must be used to distinguish the address length (note that this
902 * representation is termed a "packed array" of addresses). The caller
903 * specifies the number of addresses in the array with addrcnt.
905 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
906 * -1, and sets errno to the appropriate error code.
908 * For SCTP, the port given in each socket address must be the same, or
909 * sctp_bindx() will fail, setting errno to EINVAL.
911 * The flags parameter is formed from the bitwise OR of zero or more of
912 * the following currently defined flags:
914 * SCTP_BINDX_ADD_ADDR
916 * SCTP_BINDX_REM_ADDR
918 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
919 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
920 * addresses from the association. The two flags are mutually exclusive;
921 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
922 * not remove all addresses from an association; sctp_bindx() will
923 * reject such an attempt with EINVAL.
925 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
926 * additional addresses with an endpoint after calling bind(). Or use
927 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
928 * socket is associated with so that no new association accepted will be
929 * associated with those addresses. If the endpoint supports dynamic
930 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
931 * endpoint to send the appropriate message to the peer to change the
932 * peers address lists.
934 * Adding and removing addresses from a connected association is
935 * optional functionality. Implementations that do not support this
936 * functionality should return EOPNOTSUPP.
938 * Basically do nothing but copying the addresses from user to kernel
939 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
940 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
943 * We don't use copy_from_user() for optimization: we first do the
944 * sanity checks (buffer size -fast- and access check-healthy
945 * pointer); if all of those succeed, then we can alloc the memory
946 * (expensive operation) needed to copy the data to kernel. Then we do
947 * the copying without checking the user space area
948 * (__copy_from_user()).
950 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
953 * sk The sk of the socket
954 * addrs The pointer to the addresses in user land
955 * addrssize Size of the addrs buffer
956 * op Operation to perform (add or remove, see the flags of
959 * Returns 0 if ok, <0 errno code on error.
961 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
962 struct sockaddr __user *addrs,
963 int addrs_size, int op)
965 struct sockaddr *kaddrs;
969 struct sockaddr *sa_addr;
973 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
974 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
976 if (unlikely(addrs_size <= 0))
979 /* Check the user passed a healthy pointer. */
980 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
983 /* Alloc space for the address array in kernel memory. */
984 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
985 if (unlikely(!kaddrs))
988 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
993 /* Walk through the addrs buffer and count the number of addresses. */
995 while (walk_size < addrs_size) {
996 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1002 af = sctp_get_af_specific(sa_addr->sa_family);
1004 /* If the address family is not supported or if this address
1005 * causes the address buffer to overflow return EINVAL.
1007 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1012 addr_buf += af->sockaddr_len;
1013 walk_size += af->sockaddr_len;
1018 case SCTP_BINDX_ADD_ADDR:
1019 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1022 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1025 case SCTP_BINDX_REM_ADDR:
1026 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1029 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1043 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1045 * Common routine for handling connect() and sctp_connectx().
1046 * Connect will come in with just a single address.
1048 static int __sctp_connect(struct sock* sk,
1049 struct sockaddr *kaddrs,
1051 sctp_assoc_t *assoc_id)
1053 struct sctp_sock *sp;
1054 struct sctp_endpoint *ep;
1055 struct sctp_association *asoc = NULL;
1056 struct sctp_association *asoc2;
1057 struct sctp_transport *transport;
1065 union sctp_addr *sa_addr = NULL;
1067 unsigned short port;
1068 unsigned int f_flags = 0;
1073 /* connect() cannot be done on a socket that is already in ESTABLISHED
1074 * state - UDP-style peeled off socket or a TCP-style socket that
1075 * is already connected.
1076 * It cannot be done even on a TCP-style listening socket.
1078 if (sctp_sstate(sk, ESTABLISHED) ||
1079 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1084 /* Walk through the addrs buffer and count the number of addresses. */
1086 while (walk_size < addrs_size) {
1087 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1093 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1095 /* If the address family is not supported or if this address
1096 * causes the address buffer to overflow return EINVAL.
1098 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1103 port = ntohs(sa_addr->v4.sin_port);
1105 /* Save current address so we can work with it */
1106 memcpy(&to, sa_addr, af->sockaddr_len);
1108 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1112 /* Make sure the destination port is correctly set
1115 if (asoc && asoc->peer.port && asoc->peer.port != port)
1119 /* Check if there already is a matching association on the
1120 * endpoint (other than the one created here).
1122 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1123 if (asoc2 && asoc2 != asoc) {
1124 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1131 /* If we could not find a matching association on the endpoint,
1132 * make sure that there is no peeled-off association matching
1133 * the peer address even on another socket.
1135 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1136 err = -EADDRNOTAVAIL;
1141 /* If a bind() or sctp_bindx() is not called prior to
1142 * an sctp_connectx() call, the system picks an
1143 * ephemeral port and will choose an address set
1144 * equivalent to binding with a wildcard address.
1146 if (!ep->base.bind_addr.port) {
1147 if (sctp_autobind(sk)) {
1153 * If an unprivileged user inherits a 1-many
1154 * style socket with open associations on a
1155 * privileged port, it MAY be permitted to
1156 * accept new associations, but it SHOULD NOT
1157 * be permitted to open new associations.
1159 if (ep->base.bind_addr.port < PROT_SOCK &&
1160 !capable(CAP_NET_BIND_SERVICE)) {
1166 scope = sctp_scope(&to);
1167 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1173 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1181 /* Prime the peer's transport structures. */
1182 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1190 addr_buf += af->sockaddr_len;
1191 walk_size += af->sockaddr_len;
1194 /* In case the user of sctp_connectx() wants an association
1195 * id back, assign one now.
1198 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1203 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1208 /* Initialize sk's dport and daddr for getpeername() */
1209 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1210 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1211 af->to_sk_daddr(sa_addr, sk);
1214 /* in-kernel sockets don't generally have a file allocated to them
1215 * if all they do is call sock_create_kern().
1217 if (sk->sk_socket->file)
1218 f_flags = sk->sk_socket->file->f_flags;
1220 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1222 err = sctp_wait_for_connect(asoc, &timeo);
1223 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1224 *assoc_id = asoc->assoc_id;
1226 /* Don't free association on exit. */
1231 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1232 " kaddrs: %p err: %d\n",
1235 /* sctp_primitive_ASSOCIATE may have added this association
1236 * To the hash table, try to unhash it, just in case, its a noop
1237 * if it wasn't hashed so we're safe
1239 sctp_unhash_established(asoc);
1240 sctp_association_free(asoc);
1245 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1248 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1249 * sctp_assoc_t *asoc);
1251 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1252 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1253 * or IPv6 addresses.
1255 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1256 * Section 3.1.2 for this usage.
1258 * addrs is a pointer to an array of one or more socket addresses. Each
1259 * address is contained in its appropriate structure (i.e. struct
1260 * sockaddr_in or struct sockaddr_in6) the family of the address type
1261 * must be used to distengish the address length (note that this
1262 * representation is termed a "packed array" of addresses). The caller
1263 * specifies the number of addresses in the array with addrcnt.
1265 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1266 * the association id of the new association. On failure, sctp_connectx()
1267 * returns -1, and sets errno to the appropriate error code. The assoc_id
1268 * is not touched by the kernel.
1270 * For SCTP, the port given in each socket address must be the same, or
1271 * sctp_connectx() will fail, setting errno to EINVAL.
1273 * An application can use sctp_connectx to initiate an association with
1274 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1275 * allows a caller to specify multiple addresses at which a peer can be
1276 * reached. The way the SCTP stack uses the list of addresses to set up
1277 * the association is implementation dependent. This function only
1278 * specifies that the stack will try to make use of all the addresses in
1279 * the list when needed.
1281 * Note that the list of addresses passed in is only used for setting up
1282 * the association. It does not necessarily equal the set of addresses
1283 * the peer uses for the resulting association. If the caller wants to
1284 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1285 * retrieve them after the association has been set up.
1287 * Basically do nothing but copying the addresses from user to kernel
1288 * land and invoking either sctp_connectx(). This is used for tunneling
1289 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1291 * We don't use copy_from_user() for optimization: we first do the
1292 * sanity checks (buffer size -fast- and access check-healthy
1293 * pointer); if all of those succeed, then we can alloc the memory
1294 * (expensive operation) needed to copy the data to kernel. Then we do
1295 * the copying without checking the user space area
1296 * (__copy_from_user()).
1298 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1301 * sk The sk of the socket
1302 * addrs The pointer to the addresses in user land
1303 * addrssize Size of the addrs buffer
1305 * Returns >=0 if ok, <0 errno code on error.
1307 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1308 struct sockaddr __user *addrs,
1310 sctp_assoc_t *assoc_id)
1313 struct sockaddr *kaddrs;
1315 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1316 __func__, sk, addrs, addrs_size);
1318 if (unlikely(addrs_size <= 0))
1321 /* Check the user passed a healthy pointer. */
1322 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1325 /* Alloc space for the address array in kernel memory. */
1326 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1327 if (unlikely(!kaddrs))
1330 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1333 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1342 * This is an older interface. It's kept for backward compatibility
1343 * to the option that doesn't provide association id.
1345 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1346 struct sockaddr __user *addrs,
1349 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1353 * New interface for the API. The since the API is done with a socket
1354 * option, to make it simple we feed back the association id is as a return
1355 * indication to the call. Error is always negative and association id is
1358 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1359 struct sockaddr __user *addrs,
1362 sctp_assoc_t assoc_id = 0;
1365 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1374 * New (hopefully final) interface for the API.
1375 * We use the sctp_getaddrs_old structure so that use-space library
1376 * can avoid any unnecessary allocations. The only defferent part
1377 * is that we store the actual length of the address buffer into the
1378 * addrs_num structure member. That way we can re-use the existing
1381 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1382 char __user *optval,
1385 struct sctp_getaddrs_old param;
1386 sctp_assoc_t assoc_id = 0;
1389 if (len < sizeof(param))
1392 if (copy_from_user(¶m, optval, sizeof(param)))
1395 err = __sctp_setsockopt_connectx(sk,
1396 (struct sockaddr __user *)param.addrs,
1397 param.addr_num, &assoc_id);
1399 if (err == 0 || err == -EINPROGRESS) {
1400 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1402 if (put_user(sizeof(assoc_id), optlen))
1409 /* API 3.1.4 close() - UDP Style Syntax
1410 * Applications use close() to perform graceful shutdown (as described in
1411 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1412 * by a UDP-style socket.
1416 * ret = close(int sd);
1418 * sd - the socket descriptor of the associations to be closed.
1420 * To gracefully shutdown a specific association represented by the
1421 * UDP-style socket, an application should use the sendmsg() call,
1422 * passing no user data, but including the appropriate flag in the
1423 * ancillary data (see Section xxxx).
1425 * If sd in the close() call is a branched-off socket representing only
1426 * one association, the shutdown is performed on that association only.
1428 * 4.1.6 close() - TCP Style Syntax
1430 * Applications use close() to gracefully close down an association.
1434 * int close(int sd);
1436 * sd - the socket descriptor of the association to be closed.
1438 * After an application calls close() on a socket descriptor, no further
1439 * socket operations will succeed on that descriptor.
1441 * API 7.1.4 SO_LINGER
1443 * An application using the TCP-style socket can use this option to
1444 * perform the SCTP ABORT primitive. The linger option structure is:
1447 * int l_onoff; // option on/off
1448 * int l_linger; // linger time
1451 * To enable the option, set l_onoff to 1. If the l_linger value is set
1452 * to 0, calling close() is the same as the ABORT primitive. If the
1453 * value is set to a negative value, the setsockopt() call will return
1454 * an error. If the value is set to a positive value linger_time, the
1455 * close() can be blocked for at most linger_time ms. If the graceful
1456 * shutdown phase does not finish during this period, close() will
1457 * return but the graceful shutdown phase continues in the system.
1459 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1461 struct sctp_endpoint *ep;
1462 struct sctp_association *asoc;
1463 struct list_head *pos, *temp;
1464 unsigned int data_was_unread;
1466 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1469 sk->sk_shutdown = SHUTDOWN_MASK;
1470 sk->sk_state = SCTP_SS_CLOSING;
1472 ep = sctp_sk(sk)->ep;
1474 /* Clean up any skbs sitting on the receive queue. */
1475 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1476 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1478 /* Walk all associations on an endpoint. */
1479 list_for_each_safe(pos, temp, &ep->asocs) {
1480 asoc = list_entry(pos, struct sctp_association, asocs);
1482 if (sctp_style(sk, TCP)) {
1483 /* A closed association can still be in the list if
1484 * it belongs to a TCP-style listening socket that is
1485 * not yet accepted. If so, free it. If not, send an
1486 * ABORT or SHUTDOWN based on the linger options.
1488 if (sctp_state(asoc, CLOSED)) {
1489 sctp_unhash_established(asoc);
1490 sctp_association_free(asoc);
1495 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1496 !skb_queue_empty(&asoc->ulpq.reasm) ||
1497 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1498 struct sctp_chunk *chunk;
1500 chunk = sctp_make_abort_user(asoc, NULL, 0);
1502 sctp_primitive_ABORT(asoc, chunk);
1504 sctp_primitive_SHUTDOWN(asoc, NULL);
1507 /* On a TCP-style socket, block for at most linger_time if set. */
1508 if (sctp_style(sk, TCP) && timeout)
1509 sctp_wait_for_close(sk, timeout);
1511 /* This will run the backlog queue. */
1512 sctp_release_sock(sk);
1514 /* Supposedly, no process has access to the socket, but
1515 * the net layers still may.
1517 sctp_local_bh_disable();
1518 sctp_bh_lock_sock(sk);
1520 /* Hold the sock, since sk_common_release() will put sock_put()
1521 * and we have just a little more cleanup.
1524 sk_common_release(sk);
1526 sctp_bh_unlock_sock(sk);
1527 sctp_local_bh_enable();
1531 SCTP_DBG_OBJCNT_DEC(sock);
1534 /* Handle EPIPE error. */
1535 static int sctp_error(struct sock *sk, int flags, int err)
1538 err = sock_error(sk) ? : -EPIPE;
1539 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1540 send_sig(SIGPIPE, current, 0);
1544 /* API 3.1.3 sendmsg() - UDP Style Syntax
1546 * An application uses sendmsg() and recvmsg() calls to transmit data to
1547 * and receive data from its peer.
1549 * ssize_t sendmsg(int socket, const struct msghdr *message,
1552 * socket - the socket descriptor of the endpoint.
1553 * message - pointer to the msghdr structure which contains a single
1554 * user message and possibly some ancillary data.
1556 * See Section 5 for complete description of the data
1559 * flags - flags sent or received with the user message, see Section
1560 * 5 for complete description of the flags.
1562 * Note: This function could use a rewrite especially when explicit
1563 * connect support comes in.
1565 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1567 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1569 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1570 struct msghdr *msg, size_t msg_len)
1572 struct sctp_sock *sp;
1573 struct sctp_endpoint *ep;
1574 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1575 struct sctp_transport *transport, *chunk_tp;
1576 struct sctp_chunk *chunk;
1578 struct sockaddr *msg_name = NULL;
1579 struct sctp_sndrcvinfo default_sinfo;
1580 struct sctp_sndrcvinfo *sinfo;
1581 struct sctp_initmsg *sinit;
1582 sctp_assoc_t associd = 0;
1583 sctp_cmsgs_t cmsgs = { NULL };
1587 __u16 sinfo_flags = 0;
1588 struct sctp_datamsg *datamsg;
1589 int msg_flags = msg->msg_flags;
1591 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1598 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1600 /* We cannot send a message over a TCP-style listening socket. */
1601 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1606 /* Parse out the SCTP CMSGs. */
1607 err = sctp_msghdr_parse(msg, &cmsgs);
1610 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1614 /* Fetch the destination address for this packet. This
1615 * address only selects the association--it is not necessarily
1616 * the address we will send to.
1617 * For a peeled-off socket, msg_name is ignored.
1619 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1620 int msg_namelen = msg->msg_namelen;
1622 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1627 if (msg_namelen > sizeof(to))
1628 msg_namelen = sizeof(to);
1629 memcpy(&to, msg->msg_name, msg_namelen);
1630 msg_name = msg->msg_name;
1636 /* Did the user specify SNDRCVINFO? */
1638 sinfo_flags = sinfo->sinfo_flags;
1639 associd = sinfo->sinfo_assoc_id;
1642 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1643 msg_len, sinfo_flags);
1645 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1646 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1651 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1652 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1653 * If SCTP_ABORT is set, the message length could be non zero with
1654 * the msg_iov set to the user abort reason.
1656 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1657 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1662 /* If SCTP_ADDR_OVER is set, there must be an address
1663 * specified in msg_name.
1665 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1672 SCTP_DEBUG_PRINTK("About to look up association.\n");
1676 /* If a msg_name has been specified, assume this is to be used. */
1678 /* Look for a matching association on the endpoint. */
1679 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1681 /* If we could not find a matching association on the
1682 * endpoint, make sure that it is not a TCP-style
1683 * socket that already has an association or there is
1684 * no peeled-off association on another socket.
1686 if ((sctp_style(sk, TCP) &&
1687 sctp_sstate(sk, ESTABLISHED)) ||
1688 sctp_endpoint_is_peeled_off(ep, &to)) {
1689 err = -EADDRNOTAVAIL;
1694 asoc = sctp_id2assoc(sk, associd);
1702 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1704 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1705 * socket that has an association in CLOSED state. This can
1706 * happen when an accepted socket has an association that is
1709 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1714 if (sinfo_flags & SCTP_EOF) {
1715 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1717 sctp_primitive_SHUTDOWN(asoc, NULL);
1721 if (sinfo_flags & SCTP_ABORT) {
1723 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1729 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1730 sctp_primitive_ABORT(asoc, chunk);
1736 /* Do we need to create the association? */
1738 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1740 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1745 /* Check for invalid stream against the stream counts,
1746 * either the default or the user specified stream counts.
1749 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1750 /* Check against the defaults. */
1751 if (sinfo->sinfo_stream >=
1752 sp->initmsg.sinit_num_ostreams) {
1757 /* Check against the requested. */
1758 if (sinfo->sinfo_stream >=
1759 sinit->sinit_num_ostreams) {
1767 * API 3.1.2 bind() - UDP Style Syntax
1768 * If a bind() or sctp_bindx() is not called prior to a
1769 * sendmsg() call that initiates a new association, the
1770 * system picks an ephemeral port and will choose an address
1771 * set equivalent to binding with a wildcard address.
1773 if (!ep->base.bind_addr.port) {
1774 if (sctp_autobind(sk)) {
1780 * If an unprivileged user inherits a one-to-many
1781 * style socket with open associations on a privileged
1782 * port, it MAY be permitted to accept new associations,
1783 * but it SHOULD NOT be permitted to open new
1786 if (ep->base.bind_addr.port < PROT_SOCK &&
1787 !capable(CAP_NET_BIND_SERVICE)) {
1793 scope = sctp_scope(&to);
1794 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1800 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1806 /* If the SCTP_INIT ancillary data is specified, set all
1807 * the association init values accordingly.
1810 if (sinit->sinit_num_ostreams) {
1811 asoc->c.sinit_num_ostreams =
1812 sinit->sinit_num_ostreams;
1814 if (sinit->sinit_max_instreams) {
1815 asoc->c.sinit_max_instreams =
1816 sinit->sinit_max_instreams;
1818 if (sinit->sinit_max_attempts) {
1819 asoc->max_init_attempts
1820 = sinit->sinit_max_attempts;
1822 if (sinit->sinit_max_init_timeo) {
1823 asoc->max_init_timeo =
1824 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1828 /* Prime the peer's transport structures. */
1829 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1836 /* ASSERT: we have a valid association at this point. */
1837 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1840 /* If the user didn't specify SNDRCVINFO, make up one with
1843 memset(&default_sinfo, 0, sizeof(default_sinfo));
1844 default_sinfo.sinfo_stream = asoc->default_stream;
1845 default_sinfo.sinfo_flags = asoc->default_flags;
1846 default_sinfo.sinfo_ppid = asoc->default_ppid;
1847 default_sinfo.sinfo_context = asoc->default_context;
1848 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1849 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1850 sinfo = &default_sinfo;
1853 /* API 7.1.7, the sndbuf size per association bounds the
1854 * maximum size of data that can be sent in a single send call.
1856 if (msg_len > sk->sk_sndbuf) {
1861 if (asoc->pmtu_pending)
1862 sctp_assoc_pending_pmtu(asoc);
1864 /* If fragmentation is disabled and the message length exceeds the
1865 * association fragmentation point, return EMSGSIZE. The I-D
1866 * does not specify what this error is, but this looks like
1869 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1874 /* Check for invalid stream. */
1875 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1880 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1881 if (!sctp_wspace(asoc)) {
1882 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1887 /* If an address is passed with the sendto/sendmsg call, it is used
1888 * to override the primary destination address in the TCP model, or
1889 * when SCTP_ADDR_OVER flag is set in the UDP model.
1891 if ((sctp_style(sk, TCP) && msg_name) ||
1892 (sinfo_flags & SCTP_ADDR_OVER)) {
1893 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1901 /* Auto-connect, if we aren't connected already. */
1902 if (sctp_state(asoc, CLOSED)) {
1903 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1906 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1909 /* Break the message into multiple chunks of maximum size. */
1910 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1916 /* Now send the (possibly) fragmented message. */
1917 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1918 sctp_chunk_hold(chunk);
1920 /* Do accounting for the write space. */
1921 sctp_set_owner_w(chunk);
1923 chunk->transport = chunk_tp;
1926 /* Send it to the lower layers. Note: all chunks
1927 * must either fail or succeed. The lower layer
1928 * works that way today. Keep it that way or this
1931 err = sctp_primitive_SEND(asoc, datamsg);
1932 /* Did the lower layer accept the chunk? */
1934 sctp_datamsg_free(datamsg);
1936 sctp_datamsg_put(datamsg);
1938 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1945 /* If we are already past ASSOCIATE, the lower
1946 * layers are responsible for association cleanup.
1952 sctp_unhash_established(asoc);
1953 sctp_association_free(asoc);
1956 sctp_release_sock(sk);
1959 return sctp_error(sk, msg_flags, err);
1966 err = sock_error(sk);
1976 /* This is an extended version of skb_pull() that removes the data from the
1977 * start of a skb even when data is spread across the list of skb's in the
1978 * frag_list. len specifies the total amount of data that needs to be removed.
1979 * when 'len' bytes could be removed from the skb, it returns 0.
1980 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1981 * could not be removed.
1983 static int sctp_skb_pull(struct sk_buff *skb, int len)
1985 struct sk_buff *list;
1986 int skb_len = skb_headlen(skb);
1989 if (len <= skb_len) {
1990 __skb_pull(skb, len);
1994 __skb_pull(skb, skb_len);
1996 skb_walk_frags(skb, list) {
1997 rlen = sctp_skb_pull(list, len);
1998 skb->len -= (len-rlen);
1999 skb->data_len -= (len-rlen);
2010 /* API 3.1.3 recvmsg() - UDP Style Syntax
2012 * ssize_t recvmsg(int socket, struct msghdr *message,
2015 * socket - the socket descriptor of the endpoint.
2016 * message - pointer to the msghdr structure which contains a single
2017 * user message and possibly some ancillary data.
2019 * See Section 5 for complete description of the data
2022 * flags - flags sent or received with the user message, see Section
2023 * 5 for complete description of the flags.
2025 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2027 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2028 struct msghdr *msg, size_t len, int noblock,
2029 int flags, int *addr_len)
2031 struct sctp_ulpevent *event = NULL;
2032 struct sctp_sock *sp = sctp_sk(sk);
2033 struct sk_buff *skb;
2038 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2039 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2040 "len", len, "knoblauch", noblock,
2041 "flags", flags, "addr_len", addr_len);
2045 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2050 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2054 /* Get the total length of the skb including any skb's in the
2063 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2065 event = sctp_skb2event(skb);
2070 sock_recv_ts_and_drops(msg, sk, skb);
2071 if (sctp_ulpevent_is_notification(event)) {
2072 msg->msg_flags |= MSG_NOTIFICATION;
2073 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2075 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2078 /* Check if we allow SCTP_SNDRCVINFO. */
2079 if (sp->subscribe.sctp_data_io_event)
2080 sctp_ulpevent_read_sndrcvinfo(event, msg);
2082 /* FIXME: we should be calling IP/IPv6 layers. */
2083 if (sk->sk_protinfo.af_inet.cmsg_flags)
2084 ip_cmsg_recv(msg, skb);
2089 /* If skb's length exceeds the user's buffer, update the skb and
2090 * push it back to the receive_queue so that the next call to
2091 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2093 if (skb_len > copied) {
2094 msg->msg_flags &= ~MSG_EOR;
2095 if (flags & MSG_PEEK)
2097 sctp_skb_pull(skb, copied);
2098 skb_queue_head(&sk->sk_receive_queue, skb);
2100 /* When only partial message is copied to the user, increase
2101 * rwnd by that amount. If all the data in the skb is read,
2102 * rwnd is updated when the event is freed.
2104 if (!sctp_ulpevent_is_notification(event))
2105 sctp_assoc_rwnd_increase(event->asoc, copied);
2107 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2108 (event->msg_flags & MSG_EOR))
2109 msg->msg_flags |= MSG_EOR;
2111 msg->msg_flags &= ~MSG_EOR;
2114 if (flags & MSG_PEEK) {
2115 /* Release the skb reference acquired after peeking the skb in
2116 * sctp_skb_recv_datagram().
2120 /* Free the event which includes releasing the reference to
2121 * the owner of the skb, freeing the skb and updating the
2124 sctp_ulpevent_free(event);
2127 sctp_release_sock(sk);
2131 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2133 * This option is a on/off flag. If enabled no SCTP message
2134 * fragmentation will be performed. Instead if a message being sent
2135 * exceeds the current PMTU size, the message will NOT be sent and
2136 * instead a error will be indicated to the user.
2138 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2139 char __user *optval,
2140 unsigned int optlen)
2144 if (optlen < sizeof(int))
2147 if (get_user(val, (int __user *)optval))
2150 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2155 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2156 unsigned int optlen)
2158 struct sctp_association *asoc;
2159 struct sctp_ulpevent *event;
2161 if (optlen > sizeof(struct sctp_event_subscribe))
2163 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2167 * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2168 * if there is no data to be sent or retransmit, the stack will
2169 * immediately send up this notification.
2171 if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2172 &sctp_sk(sk)->subscribe)) {
2173 asoc = sctp_id2assoc(sk, 0);
2175 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2176 event = sctp_ulpevent_make_sender_dry_event(asoc,
2181 sctp_ulpq_tail_event(&asoc->ulpq, event);
2188 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2190 * This socket option is applicable to the UDP-style socket only. When
2191 * set it will cause associations that are idle for more than the
2192 * specified number of seconds to automatically close. An association
2193 * being idle is defined an association that has NOT sent or received
2194 * user data. The special value of '0' indicates that no automatic
2195 * close of any associations should be performed. The option expects an
2196 * integer defining the number of seconds of idle time before an
2197 * association is closed.
2199 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2200 unsigned int optlen)
2202 struct sctp_sock *sp = sctp_sk(sk);
2204 /* Applicable to UDP-style socket only */
2205 if (sctp_style(sk, TCP))
2207 if (optlen != sizeof(int))
2209 if (copy_from_user(&sp->autoclose, optval, optlen))
2215 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2217 * Applications can enable or disable heartbeats for any peer address of
2218 * an association, modify an address's heartbeat interval, force a
2219 * heartbeat to be sent immediately, and adjust the address's maximum
2220 * number of retransmissions sent before an address is considered
2221 * unreachable. The following structure is used to access and modify an
2222 * address's parameters:
2224 * struct sctp_paddrparams {
2225 * sctp_assoc_t spp_assoc_id;
2226 * struct sockaddr_storage spp_address;
2227 * uint32_t spp_hbinterval;
2228 * uint16_t spp_pathmaxrxt;
2229 * uint32_t spp_pathmtu;
2230 * uint32_t spp_sackdelay;
2231 * uint32_t spp_flags;
2234 * spp_assoc_id - (one-to-many style socket) This is filled in the
2235 * application, and identifies the association for
2237 * spp_address - This specifies which address is of interest.
2238 * spp_hbinterval - This contains the value of the heartbeat interval,
2239 * in milliseconds. If a value of zero
2240 * is present in this field then no changes are to
2241 * be made to this parameter.
2242 * spp_pathmaxrxt - This contains the maximum number of
2243 * retransmissions before this address shall be
2244 * considered unreachable. If a value of zero
2245 * is present in this field then no changes are to
2246 * be made to this parameter.
2247 * spp_pathmtu - When Path MTU discovery is disabled the value
2248 * specified here will be the "fixed" path mtu.
2249 * Note that if the spp_address field is empty
2250 * then all associations on this address will
2251 * have this fixed path mtu set upon them.
2253 * spp_sackdelay - When delayed sack is enabled, this value specifies
2254 * the number of milliseconds that sacks will be delayed
2255 * for. This value will apply to all addresses of an
2256 * association if the spp_address field is empty. Note
2257 * also, that if delayed sack is enabled and this
2258 * value is set to 0, no change is made to the last
2259 * recorded delayed sack timer value.
2261 * spp_flags - These flags are used to control various features
2262 * on an association. The flag field may contain
2263 * zero or more of the following options.
2265 * SPP_HB_ENABLE - Enable heartbeats on the
2266 * specified address. Note that if the address
2267 * field is empty all addresses for the association
2268 * have heartbeats enabled upon them.
2270 * SPP_HB_DISABLE - Disable heartbeats on the
2271 * speicifed address. Note that if the address
2272 * field is empty all addresses for the association
2273 * will have their heartbeats disabled. Note also
2274 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2275 * mutually exclusive, only one of these two should
2276 * be specified. Enabling both fields will have
2277 * undetermined results.
2279 * SPP_HB_DEMAND - Request a user initiated heartbeat
2280 * to be made immediately.
2282 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2283 * heartbeat delayis to be set to the value of 0
2286 * SPP_PMTUD_ENABLE - This field will enable PMTU
2287 * discovery upon the specified address. Note that
2288 * if the address feild is empty then all addresses
2289 * on the association are effected.
2291 * SPP_PMTUD_DISABLE - This field will disable PMTU
2292 * discovery upon the specified address. Note that
2293 * if the address feild is empty then all addresses
2294 * on the association are effected. Not also that
2295 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2296 * exclusive. Enabling both will have undetermined
2299 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2300 * on delayed sack. The time specified in spp_sackdelay
2301 * is used to specify the sack delay for this address. Note
2302 * that if spp_address is empty then all addresses will
2303 * enable delayed sack and take on the sack delay
2304 * value specified in spp_sackdelay.
2305 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2306 * off delayed sack. If the spp_address field is blank then
2307 * delayed sack is disabled for the entire association. Note
2308 * also that this field is mutually exclusive to
2309 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2312 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2313 struct sctp_transport *trans,
2314 struct sctp_association *asoc,
2315 struct sctp_sock *sp,
2318 int sackdelay_change)
2322 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2323 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2328 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2329 * this field is ignored. Note also that a value of zero indicates
2330 * the current setting should be left unchanged.
2332 if (params->spp_flags & SPP_HB_ENABLE) {
2334 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2335 * set. This lets us use 0 value when this flag
2338 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2339 params->spp_hbinterval = 0;
2341 if (params->spp_hbinterval ||
2342 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2345 msecs_to_jiffies(params->spp_hbinterval);
2348 msecs_to_jiffies(params->spp_hbinterval);
2350 sp->hbinterval = params->spp_hbinterval;
2357 trans->param_flags =
2358 (trans->param_flags & ~SPP_HB) | hb_change;
2361 (asoc->param_flags & ~SPP_HB) | hb_change;
2364 (sp->param_flags & ~SPP_HB) | hb_change;
2368 /* When Path MTU discovery is disabled the value specified here will
2369 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2370 * include the flag SPP_PMTUD_DISABLE for this field to have any
2373 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2375 trans->pathmtu = params->spp_pathmtu;
2376 sctp_assoc_sync_pmtu(asoc);
2378 asoc->pathmtu = params->spp_pathmtu;
2379 sctp_frag_point(asoc, params->spp_pathmtu);
2381 sp->pathmtu = params->spp_pathmtu;
2387 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2388 (params->spp_flags & SPP_PMTUD_ENABLE);
2389 trans->param_flags =
2390 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2392 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2393 sctp_assoc_sync_pmtu(asoc);
2397 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2400 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2404 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2405 * value of this field is ignored. Note also that a value of zero
2406 * indicates the current setting should be left unchanged.
2408 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2411 msecs_to_jiffies(params->spp_sackdelay);
2414 msecs_to_jiffies(params->spp_sackdelay);
2416 sp->sackdelay = params->spp_sackdelay;
2420 if (sackdelay_change) {
2422 trans->param_flags =
2423 (trans->param_flags & ~SPP_SACKDELAY) |
2427 (asoc->param_flags & ~SPP_SACKDELAY) |
2431 (sp->param_flags & ~SPP_SACKDELAY) |
2436 /* Note that a value of zero indicates the current setting should be
2439 if (params->spp_pathmaxrxt) {
2441 trans->pathmaxrxt = params->spp_pathmaxrxt;
2443 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2445 sp->pathmaxrxt = params->spp_pathmaxrxt;
2452 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2453 char __user *optval,
2454 unsigned int optlen)
2456 struct sctp_paddrparams params;
2457 struct sctp_transport *trans = NULL;
2458 struct sctp_association *asoc = NULL;
2459 struct sctp_sock *sp = sctp_sk(sk);
2461 int hb_change, pmtud_change, sackdelay_change;
2463 if (optlen != sizeof(struct sctp_paddrparams))
2466 if (copy_from_user(¶ms, optval, optlen))
2469 /* Validate flags and value parameters. */
2470 hb_change = params.spp_flags & SPP_HB;
2471 pmtud_change = params.spp_flags & SPP_PMTUD;
2472 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2474 if (hb_change == SPP_HB ||
2475 pmtud_change == SPP_PMTUD ||
2476 sackdelay_change == SPP_SACKDELAY ||
2477 params.spp_sackdelay > 500 ||
2478 (params.spp_pathmtu &&
2479 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2482 /* If an address other than INADDR_ANY is specified, and
2483 * no transport is found, then the request is invalid.
2485 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2486 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2487 params.spp_assoc_id);
2492 /* Get association, if assoc_id != 0 and the socket is a one
2493 * to many style socket, and an association was not found, then
2494 * the id was invalid.
2496 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2497 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2500 /* Heartbeat demand can only be sent on a transport or
2501 * association, but not a socket.
2503 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2506 /* Process parameters. */
2507 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2508 hb_change, pmtud_change,
2514 /* If changes are for association, also apply parameters to each
2517 if (!trans && asoc) {
2518 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2520 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2521 hb_change, pmtud_change,
2530 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2532 * This option will effect the way delayed acks are performed. This
2533 * option allows you to get or set the delayed ack time, in
2534 * milliseconds. It also allows changing the delayed ack frequency.
2535 * Changing the frequency to 1 disables the delayed sack algorithm. If
2536 * the assoc_id is 0, then this sets or gets the endpoints default
2537 * values. If the assoc_id field is non-zero, then the set or get
2538 * effects the specified association for the one to many model (the
2539 * assoc_id field is ignored by the one to one model). Note that if
2540 * sack_delay or sack_freq are 0 when setting this option, then the
2541 * current values will remain unchanged.
2543 * struct sctp_sack_info {
2544 * sctp_assoc_t sack_assoc_id;
2545 * uint32_t sack_delay;
2546 * uint32_t sack_freq;
2549 * sack_assoc_id - This parameter, indicates which association the user
2550 * is performing an action upon. Note that if this field's value is
2551 * zero then the endpoints default value is changed (effecting future
2552 * associations only).
2554 * sack_delay - This parameter contains the number of milliseconds that
2555 * the user is requesting the delayed ACK timer be set to. Note that
2556 * this value is defined in the standard to be between 200 and 500
2559 * sack_freq - This parameter contains the number of packets that must
2560 * be received before a sack is sent without waiting for the delay
2561 * timer to expire. The default value for this is 2, setting this
2562 * value to 1 will disable the delayed sack algorithm.
2565 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2566 char __user *optval, unsigned int optlen)
2568 struct sctp_sack_info params;
2569 struct sctp_transport *trans = NULL;
2570 struct sctp_association *asoc = NULL;
2571 struct sctp_sock *sp = sctp_sk(sk);
2573 if (optlen == sizeof(struct sctp_sack_info)) {
2574 if (copy_from_user(¶ms, optval, optlen))
2577 if (params.sack_delay == 0 && params.sack_freq == 0)
2579 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2580 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2581 pr_warn("Use struct sctp_sack_info instead\n");
2582 if (copy_from_user(¶ms, optval, optlen))
2585 if (params.sack_delay == 0)
2586 params.sack_freq = 1;
2588 params.sack_freq = 0;
2592 /* Validate value parameter. */
2593 if (params.sack_delay > 500)
2596 /* Get association, if sack_assoc_id != 0 and the socket is a one
2597 * to many style socket, and an association was not found, then
2598 * the id was invalid.
2600 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2601 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2604 if (params.sack_delay) {
2607 msecs_to_jiffies(params.sack_delay);
2609 (asoc->param_flags & ~SPP_SACKDELAY) |
2610 SPP_SACKDELAY_ENABLE;
2612 sp->sackdelay = params.sack_delay;
2614 (sp->param_flags & ~SPP_SACKDELAY) |
2615 SPP_SACKDELAY_ENABLE;
2619 if (params.sack_freq == 1) {
2622 (asoc->param_flags & ~SPP_SACKDELAY) |
2623 SPP_SACKDELAY_DISABLE;
2626 (sp->param_flags & ~SPP_SACKDELAY) |
2627 SPP_SACKDELAY_DISABLE;
2629 } else if (params.sack_freq > 1) {
2631 asoc->sackfreq = params.sack_freq;
2633 (asoc->param_flags & ~SPP_SACKDELAY) |
2634 SPP_SACKDELAY_ENABLE;
2636 sp->sackfreq = params.sack_freq;
2638 (sp->param_flags & ~SPP_SACKDELAY) |
2639 SPP_SACKDELAY_ENABLE;
2643 /* If change is for association, also apply to each transport. */
2645 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2647 if (params.sack_delay) {
2649 msecs_to_jiffies(params.sack_delay);
2650 trans->param_flags =
2651 (trans->param_flags & ~SPP_SACKDELAY) |
2652 SPP_SACKDELAY_ENABLE;
2654 if (params.sack_freq == 1) {
2655 trans->param_flags =
2656 (trans->param_flags & ~SPP_SACKDELAY) |
2657 SPP_SACKDELAY_DISABLE;
2658 } else if (params.sack_freq > 1) {
2659 trans->sackfreq = params.sack_freq;
2660 trans->param_flags =
2661 (trans->param_flags & ~SPP_SACKDELAY) |
2662 SPP_SACKDELAY_ENABLE;
2670 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2672 * Applications can specify protocol parameters for the default association
2673 * initialization. The option name argument to setsockopt() and getsockopt()
2676 * Setting initialization parameters is effective only on an unconnected
2677 * socket (for UDP-style sockets only future associations are effected
2678 * by the change). With TCP-style sockets, this option is inherited by
2679 * sockets derived from a listener socket.
2681 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2683 struct sctp_initmsg sinit;
2684 struct sctp_sock *sp = sctp_sk(sk);
2686 if (optlen != sizeof(struct sctp_initmsg))
2688 if (copy_from_user(&sinit, optval, optlen))
2691 if (sinit.sinit_num_ostreams)
2692 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2693 if (sinit.sinit_max_instreams)
2694 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2695 if (sinit.sinit_max_attempts)
2696 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2697 if (sinit.sinit_max_init_timeo)
2698 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2704 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2706 * Applications that wish to use the sendto() system call may wish to
2707 * specify a default set of parameters that would normally be supplied
2708 * through the inclusion of ancillary data. This socket option allows
2709 * such an application to set the default sctp_sndrcvinfo structure.
2710 * The application that wishes to use this socket option simply passes
2711 * in to this call the sctp_sndrcvinfo structure defined in Section
2712 * 5.2.2) The input parameters accepted by this call include
2713 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2714 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2715 * to this call if the caller is using the UDP model.
2717 static int sctp_setsockopt_default_send_param(struct sock *sk,
2718 char __user *optval,
2719 unsigned int optlen)
2721 struct sctp_sndrcvinfo info;
2722 struct sctp_association *asoc;
2723 struct sctp_sock *sp = sctp_sk(sk);
2725 if (optlen != sizeof(struct sctp_sndrcvinfo))
2727 if (copy_from_user(&info, optval, optlen))
2730 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2731 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2735 asoc->default_stream = info.sinfo_stream;
2736 asoc->default_flags = info.sinfo_flags;
2737 asoc->default_ppid = info.sinfo_ppid;
2738 asoc->default_context = info.sinfo_context;
2739 asoc->default_timetolive = info.sinfo_timetolive;
2741 sp->default_stream = info.sinfo_stream;
2742 sp->default_flags = info.sinfo_flags;
2743 sp->default_ppid = info.sinfo_ppid;
2744 sp->default_context = info.sinfo_context;
2745 sp->default_timetolive = info.sinfo_timetolive;
2751 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2753 * Requests that the local SCTP stack use the enclosed peer address as
2754 * the association primary. The enclosed address must be one of the
2755 * association peer's addresses.
2757 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2758 unsigned int optlen)
2760 struct sctp_prim prim;
2761 struct sctp_transport *trans;
2763 if (optlen != sizeof(struct sctp_prim))
2766 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2769 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2773 sctp_assoc_set_primary(trans->asoc, trans);
2779 * 7.1.5 SCTP_NODELAY
2781 * Turn on/off any Nagle-like algorithm. This means that packets are
2782 * generally sent as soon as possible and no unnecessary delays are
2783 * introduced, at the cost of more packets in the network. Expects an
2784 * integer boolean flag.
2786 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2787 unsigned int optlen)
2791 if (optlen < sizeof(int))
2793 if (get_user(val, (int __user *)optval))
2796 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2802 * 7.1.1 SCTP_RTOINFO
2804 * The protocol parameters used to initialize and bound retransmission
2805 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2806 * and modify these parameters.
2807 * All parameters are time values, in milliseconds. A value of 0, when
2808 * modifying the parameters, indicates that the current value should not
2812 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2814 struct sctp_rtoinfo rtoinfo;
2815 struct sctp_association *asoc;
2817 if (optlen != sizeof (struct sctp_rtoinfo))
2820 if (copy_from_user(&rtoinfo, optval, optlen))
2823 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2825 /* Set the values to the specific association */
2826 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2830 if (rtoinfo.srto_initial != 0)
2832 msecs_to_jiffies(rtoinfo.srto_initial);
2833 if (rtoinfo.srto_max != 0)
2834 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2835 if (rtoinfo.srto_min != 0)
2836 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2838 /* If there is no association or the association-id = 0
2839 * set the values to the endpoint.
2841 struct sctp_sock *sp = sctp_sk(sk);
2843 if (rtoinfo.srto_initial != 0)
2844 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2845 if (rtoinfo.srto_max != 0)
2846 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2847 if (rtoinfo.srto_min != 0)
2848 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2856 * 7.1.2 SCTP_ASSOCINFO
2858 * This option is used to tune the maximum retransmission attempts
2859 * of the association.
2860 * Returns an error if the new association retransmission value is
2861 * greater than the sum of the retransmission value of the peer.
2862 * See [SCTP] for more information.
2865 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2868 struct sctp_assocparams assocparams;
2869 struct sctp_association *asoc;
2871 if (optlen != sizeof(struct sctp_assocparams))
2873 if (copy_from_user(&assocparams, optval, optlen))
2876 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2878 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2881 /* Set the values to the specific association */
2883 if (assocparams.sasoc_asocmaxrxt != 0) {
2886 struct sctp_transport *peer_addr;
2888 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2890 path_sum += peer_addr->pathmaxrxt;
2894 /* Only validate asocmaxrxt if we have more than
2895 * one path/transport. We do this because path
2896 * retransmissions are only counted when we have more
2900 assocparams.sasoc_asocmaxrxt > path_sum)
2903 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2906 if (assocparams.sasoc_cookie_life != 0) {
2907 asoc->cookie_life.tv_sec =
2908 assocparams.sasoc_cookie_life / 1000;
2909 asoc->cookie_life.tv_usec =
2910 (assocparams.sasoc_cookie_life % 1000)
2914 /* Set the values to the endpoint */
2915 struct sctp_sock *sp = sctp_sk(sk);
2917 if (assocparams.sasoc_asocmaxrxt != 0)
2918 sp->assocparams.sasoc_asocmaxrxt =
2919 assocparams.sasoc_asocmaxrxt;
2920 if (assocparams.sasoc_cookie_life != 0)
2921 sp->assocparams.sasoc_cookie_life =
2922 assocparams.sasoc_cookie_life;
2928 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2930 * This socket option is a boolean flag which turns on or off mapped V4
2931 * addresses. If this option is turned on and the socket is type
2932 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2933 * If this option is turned off, then no mapping will be done of V4
2934 * addresses and a user will receive both PF_INET6 and PF_INET type
2935 * addresses on the socket.
2937 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2940 struct sctp_sock *sp = sctp_sk(sk);
2942 if (optlen < sizeof(int))
2944 if (get_user(val, (int __user *)optval))
2955 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2956 * This option will get or set the maximum size to put in any outgoing
2957 * SCTP DATA chunk. If a message is larger than this size it will be
2958 * fragmented by SCTP into the specified size. Note that the underlying
2959 * SCTP implementation may fragment into smaller sized chunks when the
2960 * PMTU of the underlying association is smaller than the value set by
2961 * the user. The default value for this option is '0' which indicates
2962 * the user is NOT limiting fragmentation and only the PMTU will effect
2963 * SCTP's choice of DATA chunk size. Note also that values set larger
2964 * than the maximum size of an IP datagram will effectively let SCTP
2965 * control fragmentation (i.e. the same as setting this option to 0).
2967 * The following structure is used to access and modify this parameter:
2969 * struct sctp_assoc_value {
2970 * sctp_assoc_t assoc_id;
2971 * uint32_t assoc_value;
2974 * assoc_id: This parameter is ignored for one-to-one style sockets.
2975 * For one-to-many style sockets this parameter indicates which
2976 * association the user is performing an action upon. Note that if
2977 * this field's value is zero then the endpoints default value is
2978 * changed (effecting future associations only).
2979 * assoc_value: This parameter specifies the maximum size in bytes.
2981 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2983 struct sctp_assoc_value params;
2984 struct sctp_association *asoc;
2985 struct sctp_sock *sp = sctp_sk(sk);
2988 if (optlen == sizeof(int)) {
2989 pr_warn("Use of int in maxseg socket option deprecated\n");
2990 pr_warn("Use struct sctp_assoc_value instead\n");
2991 if (copy_from_user(&val, optval, optlen))
2993 params.assoc_id = 0;
2994 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2995 if (copy_from_user(¶ms, optval, optlen))
2997 val = params.assoc_value;
3001 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3004 asoc = sctp_id2assoc(sk, params.assoc_id);
3005 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3010 val = asoc->pathmtu;
3011 val -= sp->pf->af->net_header_len;
3012 val -= sizeof(struct sctphdr) +
3013 sizeof(struct sctp_data_chunk);
3015 asoc->user_frag = val;
3016 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3018 sp->user_frag = val;
3026 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3028 * Requests that the peer mark the enclosed address as the association
3029 * primary. The enclosed address must be one of the association's
3030 * locally bound addresses. The following structure is used to make a
3031 * set primary request:
3033 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3034 unsigned int optlen)
3036 struct sctp_sock *sp;
3037 struct sctp_association *asoc = NULL;
3038 struct sctp_setpeerprim prim;
3039 struct sctp_chunk *chunk;
3045 if (!sctp_addip_enable)
3048 if (optlen != sizeof(struct sctp_setpeerprim))
3051 if (copy_from_user(&prim, optval, optlen))
3054 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3058 if (!asoc->peer.asconf_capable)
3061 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3064 if (!sctp_state(asoc, ESTABLISHED))
3067 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3071 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3072 return -EADDRNOTAVAIL;
3074 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3075 return -EADDRNOTAVAIL;
3077 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3078 chunk = sctp_make_asconf_set_prim(asoc,
3079 (union sctp_addr *)&prim.sspp_addr);
3083 err = sctp_send_asconf(asoc, chunk);
3085 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3090 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3091 unsigned int optlen)
3093 struct sctp_setadaptation adaptation;
3095 if (optlen != sizeof(struct sctp_setadaptation))
3097 if (copy_from_user(&adaptation, optval, optlen))
3100 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3106 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3108 * The context field in the sctp_sndrcvinfo structure is normally only
3109 * used when a failed message is retrieved holding the value that was
3110 * sent down on the actual send call. This option allows the setting of
3111 * a default context on an association basis that will be received on
3112 * reading messages from the peer. This is especially helpful in the
3113 * one-2-many model for an application to keep some reference to an
3114 * internal state machine that is processing messages on the
3115 * association. Note that the setting of this value only effects
3116 * received messages from the peer and does not effect the value that is
3117 * saved with outbound messages.
3119 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3120 unsigned int optlen)
3122 struct sctp_assoc_value params;
3123 struct sctp_sock *sp;
3124 struct sctp_association *asoc;
3126 if (optlen != sizeof(struct sctp_assoc_value))
3128 if (copy_from_user(¶ms, optval, optlen))
3133 if (params.assoc_id != 0) {
3134 asoc = sctp_id2assoc(sk, params.assoc_id);
3137 asoc->default_rcv_context = params.assoc_value;
3139 sp->default_rcv_context = params.assoc_value;
3146 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3148 * This options will at a minimum specify if the implementation is doing
3149 * fragmented interleave. Fragmented interleave, for a one to many
3150 * socket, is when subsequent calls to receive a message may return
3151 * parts of messages from different associations. Some implementations
3152 * may allow you to turn this value on or off. If so, when turned off,
3153 * no fragment interleave will occur (which will cause a head of line
3154 * blocking amongst multiple associations sharing the same one to many
3155 * socket). When this option is turned on, then each receive call may
3156 * come from a different association (thus the user must receive data
3157 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3158 * association each receive belongs to.
3160 * This option takes a boolean value. A non-zero value indicates that
3161 * fragmented interleave is on. A value of zero indicates that
3162 * fragmented interleave is off.
3164 * Note that it is important that an implementation that allows this
3165 * option to be turned on, have it off by default. Otherwise an unaware
3166 * application using the one to many model may become confused and act
3169 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3170 char __user *optval,
3171 unsigned int optlen)
3175 if (optlen != sizeof(int))
3177 if (get_user(val, (int __user *)optval))
3180 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3186 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3187 * (SCTP_PARTIAL_DELIVERY_POINT)
3189 * This option will set or get the SCTP partial delivery point. This
3190 * point is the size of a message where the partial delivery API will be
3191 * invoked to help free up rwnd space for the peer. Setting this to a
3192 * lower value will cause partial deliveries to happen more often. The
3193 * calls argument is an integer that sets or gets the partial delivery
3194 * point. Note also that the call will fail if the user attempts to set
3195 * this value larger than the socket receive buffer size.
3197 * Note that any single message having a length smaller than or equal to
3198 * the SCTP partial delivery point will be delivered in one single read
3199 * call as long as the user provided buffer is large enough to hold the
3202 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3203 char __user *optval,
3204 unsigned int optlen)
3208 if (optlen != sizeof(u32))
3210 if (get_user(val, (int __user *)optval))
3213 /* Note: We double the receive buffer from what the user sets
3214 * it to be, also initial rwnd is based on rcvbuf/2.
3216 if (val > (sk->sk_rcvbuf >> 1))
3219 sctp_sk(sk)->pd_point = val;
3221 return 0; /* is this the right error code? */
3225 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3227 * This option will allow a user to change the maximum burst of packets
3228 * that can be emitted by this association. Note that the default value
3229 * is 4, and some implementations may restrict this setting so that it
3230 * can only be lowered.
3232 * NOTE: This text doesn't seem right. Do this on a socket basis with
3233 * future associations inheriting the socket value.
3235 static int sctp_setsockopt_maxburst(struct sock *sk,
3236 char __user *optval,
3237 unsigned int optlen)
3239 struct sctp_assoc_value params;
3240 struct sctp_sock *sp;
3241 struct sctp_association *asoc;
3245 if (optlen == sizeof(int)) {
3246 pr_warn("Use of int in max_burst socket option deprecated\n");
3247 pr_warn("Use struct sctp_assoc_value instead\n");
3248 if (copy_from_user(&val, optval, optlen))
3250 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3251 if (copy_from_user(¶ms, optval, optlen))
3253 val = params.assoc_value;
3254 assoc_id = params.assoc_id;
3260 if (assoc_id != 0) {
3261 asoc = sctp_id2assoc(sk, assoc_id);
3264 asoc->max_burst = val;
3266 sp->max_burst = val;
3272 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3274 * This set option adds a chunk type that the user is requesting to be
3275 * received only in an authenticated way. Changes to the list of chunks
3276 * will only effect future associations on the socket.
3278 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3279 char __user *optval,
3280 unsigned int optlen)
3282 struct sctp_authchunk val;
3284 if (!sctp_auth_enable)
3287 if (optlen != sizeof(struct sctp_authchunk))
3289 if (copy_from_user(&val, optval, optlen))
3292 switch (val.sauth_chunk) {
3294 case SCTP_CID_INIT_ACK:
3295 case SCTP_CID_SHUTDOWN_COMPLETE:
3300 /* add this chunk id to the endpoint */
3301 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3305 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3307 * This option gets or sets the list of HMAC algorithms that the local
3308 * endpoint requires the peer to use.
3310 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3311 char __user *optval,
3312 unsigned int optlen)
3314 struct sctp_hmacalgo *hmacs;
3318 if (!sctp_auth_enable)
3321 if (optlen < sizeof(struct sctp_hmacalgo))
3324 hmacs= memdup_user(optval, optlen);
3326 return PTR_ERR(hmacs);
3328 idents = hmacs->shmac_num_idents;
3329 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3330 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3335 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3342 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3344 * This option will set a shared secret key which is used to build an
3345 * association shared key.
3347 static int sctp_setsockopt_auth_key(struct sock *sk,
3348 char __user *optval,
3349 unsigned int optlen)
3351 struct sctp_authkey *authkey;
3352 struct sctp_association *asoc;
3355 if (!sctp_auth_enable)
3358 if (optlen <= sizeof(struct sctp_authkey))
3361 authkey= memdup_user(optval, optlen);
3362 if (IS_ERR(authkey))
3363 return PTR_ERR(authkey);
3365 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3370 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3371 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3376 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3383 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3385 * This option will get or set the active shared key to be used to build
3386 * the association shared key.
3388 static int sctp_setsockopt_active_key(struct sock *sk,
3389 char __user *optval,
3390 unsigned int optlen)
3392 struct sctp_authkeyid val;
3393 struct sctp_association *asoc;
3395 if (!sctp_auth_enable)
3398 if (optlen != sizeof(struct sctp_authkeyid))
3400 if (copy_from_user(&val, optval, optlen))
3403 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3404 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3407 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3408 val.scact_keynumber);
3412 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3414 * This set option will delete a shared secret key from use.
3416 static int sctp_setsockopt_del_key(struct sock *sk,
3417 char __user *optval,
3418 unsigned int optlen)
3420 struct sctp_authkeyid val;
3421 struct sctp_association *asoc;
3423 if (!sctp_auth_enable)
3426 if (optlen != sizeof(struct sctp_authkeyid))
3428 if (copy_from_user(&val, optval, optlen))
3431 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3432 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3435 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3436 val.scact_keynumber);
3441 * 8.1.23 SCTP_AUTO_ASCONF
3443 * This option will enable or disable the use of the automatic generation of
3444 * ASCONF chunks to add and delete addresses to an existing association. Note
3445 * that this option has two caveats namely: a) it only affects sockets that
3446 * are bound to all addresses available to the SCTP stack, and b) the system
3447 * administrator may have an overriding control that turns the ASCONF feature
3448 * off no matter what setting the socket option may have.
3449 * This option expects an integer boolean flag, where a non-zero value turns on
3450 * the option, and a zero value turns off the option.
3451 * Note. In this implementation, socket operation overrides default parameter
3452 * being set by sysctl as well as FreeBSD implementation
3454 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3455 unsigned int optlen)
3458 struct sctp_sock *sp = sctp_sk(sk);
3460 if (optlen < sizeof(int))
3462 if (get_user(val, (int __user *)optval))
3464 if (!sctp_is_ep_boundall(sk) && val)
3466 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3469 if (val == 0 && sp->do_auto_asconf) {
3470 list_del(&sp->auto_asconf_list);
3471 sp->do_auto_asconf = 0;
3472 } else if (val && !sp->do_auto_asconf) {
3473 list_add_tail(&sp->auto_asconf_list,
3474 &sctp_auto_asconf_splist);
3475 sp->do_auto_asconf = 1;
3481 /* API 6.2 setsockopt(), getsockopt()
3483 * Applications use setsockopt() and getsockopt() to set or retrieve
3484 * socket options. Socket options are used to change the default
3485 * behavior of sockets calls. They are described in Section 7.
3489 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3490 * int __user *optlen);
3491 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3494 * sd - the socket descript.
3495 * level - set to IPPROTO_SCTP for all SCTP options.
3496 * optname - the option name.
3497 * optval - the buffer to store the value of the option.
3498 * optlen - the size of the buffer.
3500 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3501 char __user *optval, unsigned int optlen)
3505 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3508 /* I can hardly begin to describe how wrong this is. This is
3509 * so broken as to be worse than useless. The API draft
3510 * REALLY is NOT helpful here... I am not convinced that the
3511 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3512 * are at all well-founded.
3514 if (level != SOL_SCTP) {
3515 struct sctp_af *af = sctp_sk(sk)->pf->af;
3516 retval = af->setsockopt(sk, level, optname, optval, optlen);
3523 case SCTP_SOCKOPT_BINDX_ADD:
3524 /* 'optlen' is the size of the addresses buffer. */
3525 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3526 optlen, SCTP_BINDX_ADD_ADDR);
3529 case SCTP_SOCKOPT_BINDX_REM:
3530 /* 'optlen' is the size of the addresses buffer. */
3531 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3532 optlen, SCTP_BINDX_REM_ADDR);
3535 case SCTP_SOCKOPT_CONNECTX_OLD:
3536 /* 'optlen' is the size of the addresses buffer. */
3537 retval = sctp_setsockopt_connectx_old(sk,
3538 (struct sockaddr __user *)optval,
3542 case SCTP_SOCKOPT_CONNECTX:
3543 /* 'optlen' is the size of the addresses buffer. */
3544 retval = sctp_setsockopt_connectx(sk,
3545 (struct sockaddr __user *)optval,
3549 case SCTP_DISABLE_FRAGMENTS:
3550 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3554 retval = sctp_setsockopt_events(sk, optval, optlen);
3557 case SCTP_AUTOCLOSE:
3558 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3561 case SCTP_PEER_ADDR_PARAMS:
3562 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3565 case SCTP_DELAYED_SACK:
3566 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3568 case SCTP_PARTIAL_DELIVERY_POINT:
3569 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3573 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3575 case SCTP_DEFAULT_SEND_PARAM:
3576 retval = sctp_setsockopt_default_send_param(sk, optval,
3579 case SCTP_PRIMARY_ADDR:
3580 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3582 case SCTP_SET_PEER_PRIMARY_ADDR:
3583 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3586 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3589 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3591 case SCTP_ASSOCINFO:
3592 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3594 case SCTP_I_WANT_MAPPED_V4_ADDR:
3595 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3598 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3600 case SCTP_ADAPTATION_LAYER:
3601 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3604 retval = sctp_setsockopt_context(sk, optval, optlen);
3606 case SCTP_FRAGMENT_INTERLEAVE:
3607 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3609 case SCTP_MAX_BURST:
3610 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3612 case SCTP_AUTH_CHUNK:
3613 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3615 case SCTP_HMAC_IDENT:
3616 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3619 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3621 case SCTP_AUTH_ACTIVE_KEY:
3622 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3624 case SCTP_AUTH_DELETE_KEY:
3625 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3627 case SCTP_AUTO_ASCONF:
3628 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3631 retval = -ENOPROTOOPT;
3635 sctp_release_sock(sk);
3641 /* API 3.1.6 connect() - UDP Style Syntax
3643 * An application may use the connect() call in the UDP model to initiate an
3644 * association without sending data.
3648 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3650 * sd: the socket descriptor to have a new association added to.
3652 * nam: the address structure (either struct sockaddr_in or struct
3653 * sockaddr_in6 defined in RFC2553 [7]).
3655 * len: the size of the address.
3657 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3665 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3666 __func__, sk, addr, addr_len);
3668 /* Validate addr_len before calling common connect/connectx routine. */
3669 af = sctp_get_af_specific(addr->sa_family);
3670 if (!af || addr_len < af->sockaddr_len) {
3673 /* Pass correct addr len to common routine (so it knows there
3674 * is only one address being passed.
3676 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3679 sctp_release_sock(sk);
3683 /* FIXME: Write comments. */
3684 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3686 return -EOPNOTSUPP; /* STUB */
3689 /* 4.1.4 accept() - TCP Style Syntax
3691 * Applications use accept() call to remove an established SCTP
3692 * association from the accept queue of the endpoint. A new socket
3693 * descriptor will be returned from accept() to represent the newly
3694 * formed association.
3696 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3698 struct sctp_sock *sp;
3699 struct sctp_endpoint *ep;
3700 struct sock *newsk = NULL;
3701 struct sctp_association *asoc;
3710 if (!sctp_style(sk, TCP)) {
3711 error = -EOPNOTSUPP;
3715 if (!sctp_sstate(sk, LISTENING)) {
3720 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3722 error = sctp_wait_for_accept(sk, timeo);
3726 /* We treat the list of associations on the endpoint as the accept
3727 * queue and pick the first association on the list.
3729 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3731 newsk = sp->pf->create_accept_sk(sk, asoc);
3737 /* Populate the fields of the newsk from the oldsk and migrate the
3738 * asoc to the newsk.
3740 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3743 sctp_release_sock(sk);
3748 /* The SCTP ioctl handler. */
3749 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3756 * SEQPACKET-style sockets in LISTENING state are valid, for
3757 * SCTP, so only discard TCP-style sockets in LISTENING state.
3759 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3764 struct sk_buff *skb;
3765 unsigned int amount = 0;
3767 skb = skb_peek(&sk->sk_receive_queue);
3770 * We will only return the amount of this packet since
3771 * that is all that will be read.
3775 rc = put_user(amount, (int __user *)arg);
3783 sctp_release_sock(sk);
3787 /* This is the function which gets called during socket creation to
3788 * initialized the SCTP-specific portion of the sock.
3789 * The sock structure should already be zero-filled memory.
3791 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3793 struct sctp_endpoint *ep;
3794 struct sctp_sock *sp;
3796 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3800 /* Initialize the SCTP per socket area. */
3801 switch (sk->sk_type) {
3802 case SOCK_SEQPACKET:
3803 sp->type = SCTP_SOCKET_UDP;
3806 sp->type = SCTP_SOCKET_TCP;
3809 return -ESOCKTNOSUPPORT;
3812 /* Initialize default send parameters. These parameters can be
3813 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3815 sp->default_stream = 0;
3816 sp->default_ppid = 0;
3817 sp->default_flags = 0;
3818 sp->default_context = 0;
3819 sp->default_timetolive = 0;
3821 sp->default_rcv_context = 0;
3822 sp->max_burst = sctp_max_burst;
3824 /* Initialize default setup parameters. These parameters
3825 * can be modified with the SCTP_INITMSG socket option or
3826 * overridden by the SCTP_INIT CMSG.
3828 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3829 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3830 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3831 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3833 /* Initialize default RTO related parameters. These parameters can
3834 * be modified for with the SCTP_RTOINFO socket option.
3836 sp->rtoinfo.srto_initial = sctp_rto_initial;
3837 sp->rtoinfo.srto_max = sctp_rto_max;
3838 sp->rtoinfo.srto_min = sctp_rto_min;
3840 /* Initialize default association related parameters. These parameters
3841 * can be modified with the SCTP_ASSOCINFO socket option.
3843 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3844 sp->assocparams.sasoc_number_peer_destinations = 0;
3845 sp->assocparams.sasoc_peer_rwnd = 0;
3846 sp->assocparams.sasoc_local_rwnd = 0;
3847 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3849 /* Initialize default event subscriptions. By default, all the
3852 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3854 /* Default Peer Address Parameters. These defaults can
3855 * be modified via SCTP_PEER_ADDR_PARAMS
3857 sp->hbinterval = sctp_hb_interval;
3858 sp->pathmaxrxt = sctp_max_retrans_path;
3859 sp->pathmtu = 0; // allow default discovery
3860 sp->sackdelay = sctp_sack_timeout;
3862 sp->param_flags = SPP_HB_ENABLE |
3864 SPP_SACKDELAY_ENABLE;
3866 /* If enabled no SCTP message fragmentation will be performed.
3867 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3869 sp->disable_fragments = 0;
3871 /* Enable Nagle algorithm by default. */
3874 /* Enable by default. */
3877 /* Auto-close idle associations after the configured
3878 * number of seconds. A value of 0 disables this
3879 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3880 * for UDP-style sockets only.
3884 /* User specified fragmentation limit. */
3887 sp->adaptation_ind = 0;
3889 sp->pf = sctp_get_pf_specific(sk->sk_family);
3891 /* Control variables for partial data delivery. */
3892 atomic_set(&sp->pd_mode, 0);
3893 skb_queue_head_init(&sp->pd_lobby);
3894 sp->frag_interleave = 0;
3896 /* Create a per socket endpoint structure. Even if we
3897 * change the data structure relationships, this may still
3898 * be useful for storing pre-connect address information.
3900 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3907 SCTP_DBG_OBJCNT_INC(sock);
3910 percpu_counter_inc(&sctp_sockets_allocated);
3911 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3912 if (sctp_default_auto_asconf) {
3913 list_add_tail(&sp->auto_asconf_list,
3914 &sctp_auto_asconf_splist);
3915 sp->do_auto_asconf = 1;
3917 sp->do_auto_asconf = 0;
3923 /* Cleanup any SCTP per socket resources. */
3924 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3926 struct sctp_sock *sp;
3928 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3930 /* Release our hold on the endpoint. */
3932 if (sp->do_auto_asconf) {
3933 sp->do_auto_asconf = 0;
3934 list_del(&sp->auto_asconf_list);
3936 sctp_endpoint_free(sp->ep);
3938 percpu_counter_dec(&sctp_sockets_allocated);
3939 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3943 /* API 4.1.7 shutdown() - TCP Style Syntax
3944 * int shutdown(int socket, int how);
3946 * sd - the socket descriptor of the association to be closed.
3947 * how - Specifies the type of shutdown. The values are
3950 * Disables further receive operations. No SCTP
3951 * protocol action is taken.
3953 * Disables further send operations, and initiates
3954 * the SCTP shutdown sequence.
3956 * Disables further send and receive operations
3957 * and initiates the SCTP shutdown sequence.
3959 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3961 struct sctp_endpoint *ep;
3962 struct sctp_association *asoc;
3964 if (!sctp_style(sk, TCP))
3967 if (how & SEND_SHUTDOWN) {
3968 ep = sctp_sk(sk)->ep;
3969 if (!list_empty(&ep->asocs)) {
3970 asoc = list_entry(ep->asocs.next,
3971 struct sctp_association, asocs);
3972 sctp_primitive_SHUTDOWN(asoc, NULL);
3977 /* 7.2.1 Association Status (SCTP_STATUS)
3979 * Applications can retrieve current status information about an
3980 * association, including association state, peer receiver window size,
3981 * number of unacked data chunks, and number of data chunks pending
3982 * receipt. This information is read-only.
3984 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3985 char __user *optval,
3988 struct sctp_status status;
3989 struct sctp_association *asoc = NULL;
3990 struct sctp_transport *transport;
3991 sctp_assoc_t associd;
3994 if (len < sizeof(status)) {
3999 len = sizeof(status);
4000 if (copy_from_user(&status, optval, len)) {
4005 associd = status.sstat_assoc_id;
4006 asoc = sctp_id2assoc(sk, associd);
4012 transport = asoc->peer.primary_path;
4014 status.sstat_assoc_id = sctp_assoc2id(asoc);
4015 status.sstat_state = asoc->state;
4016 status.sstat_rwnd = asoc->peer.rwnd;
4017 status.sstat_unackdata = asoc->unack_data;
4019 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4020 status.sstat_instrms = asoc->c.sinit_max_instreams;
4021 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4022 status.sstat_fragmentation_point = asoc->frag_point;
4023 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4024 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4025 transport->af_specific->sockaddr_len);
4026 /* Map ipv4 address into v4-mapped-on-v6 address. */
4027 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4028 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4029 status.sstat_primary.spinfo_state = transport->state;
4030 status.sstat_primary.spinfo_cwnd = transport->cwnd;
4031 status.sstat_primary.spinfo_srtt = transport->srtt;
4032 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4033 status.sstat_primary.spinfo_mtu = transport->pathmtu;
4035 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4036 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4038 if (put_user(len, optlen)) {
4043 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4044 len, status.sstat_state, status.sstat_rwnd,
4045 status.sstat_assoc_id);
4047 if (copy_to_user(optval, &status, len)) {
4057 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4059 * Applications can retrieve information about a specific peer address
4060 * of an association, including its reachability state, congestion
4061 * window, and retransmission timer values. This information is
4064 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4065 char __user *optval,
4068 struct sctp_paddrinfo pinfo;
4069 struct sctp_transport *transport;
4072 if (len < sizeof(pinfo)) {
4077 len = sizeof(pinfo);
4078 if (copy_from_user(&pinfo, optval, len)) {
4083 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4084 pinfo.spinfo_assoc_id);
4088 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4089 pinfo.spinfo_state = transport->state;
4090 pinfo.spinfo_cwnd = transport->cwnd;
4091 pinfo.spinfo_srtt = transport->srtt;
4092 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4093 pinfo.spinfo_mtu = transport->pathmtu;
4095 if (pinfo.spinfo_state == SCTP_UNKNOWN)
4096 pinfo.spinfo_state = SCTP_ACTIVE;
4098 if (put_user(len, optlen)) {
4103 if (copy_to_user(optval, &pinfo, len)) {
4112 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4114 * This option is a on/off flag. If enabled no SCTP message
4115 * fragmentation will be performed. Instead if a message being sent
4116 * exceeds the current PMTU size, the message will NOT be sent and
4117 * instead a error will be indicated to the user.
4119 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4120 char __user *optval, int __user *optlen)
4124 if (len < sizeof(int))
4128 val = (sctp_sk(sk)->disable_fragments == 1);
4129 if (put_user(len, optlen))
4131 if (copy_to_user(optval, &val, len))
4136 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4138 * This socket option is used to specify various notifications and
4139 * ancillary data the user wishes to receive.
4141 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4146 if (len > sizeof(struct sctp_event_subscribe))
4147 len = sizeof(struct sctp_event_subscribe);
4148 if (put_user(len, optlen))
4150 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4155 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4157 * This socket option is applicable to the UDP-style socket only. When
4158 * set it will cause associations that are idle for more than the
4159 * specified number of seconds to automatically close. An association
4160 * being idle is defined an association that has NOT sent or received
4161 * user data. The special value of '0' indicates that no automatic
4162 * close of any associations should be performed. The option expects an
4163 * integer defining the number of seconds of idle time before an
4164 * association is closed.
4166 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4168 /* Applicable to UDP-style socket only */
4169 if (sctp_style(sk, TCP))
4171 if (len < sizeof(int))
4174 if (put_user(len, optlen))
4176 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4181 /* Helper routine to branch off an association to a new socket. */
4182 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4184 struct sctp_association *asoc = sctp_id2assoc(sk, id);
4185 struct socket *sock;
4192 /* An association cannot be branched off from an already peeled-off
4193 * socket, nor is this supported for tcp style sockets.
4195 if (!sctp_style(sk, UDP))
4198 /* Create a new socket. */
4199 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4203 sctp_copy_sock(sock->sk, sk, asoc);
4205 /* Make peeled-off sockets more like 1-1 accepted sockets.
4206 * Set the daddr and initialize id to something more random
4208 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4209 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4211 /* Populate the fields of the newsk from the oldsk and migrate the
4212 * asoc to the newsk.
4214 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4220 EXPORT_SYMBOL(sctp_do_peeloff);
4222 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4224 sctp_peeloff_arg_t peeloff;
4225 struct socket *newsock;
4228 if (len < sizeof(sctp_peeloff_arg_t))
4230 len = sizeof(sctp_peeloff_arg_t);
4231 if (copy_from_user(&peeloff, optval, len))
4234 retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4238 /* Map the socket to an unused fd that can be returned to the user. */
4239 retval = sock_map_fd(newsock, 0);
4241 sock_release(newsock);
4245 SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4246 __func__, sk, newsock->sk, retval);
4248 /* Return the fd mapped to the new socket. */
4249 peeloff.sd = retval;
4250 if (put_user(len, optlen))
4252 if (copy_to_user(optval, &peeloff, len))
4259 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4261 * Applications can enable or disable heartbeats for any peer address of
4262 * an association, modify an address's heartbeat interval, force a
4263 * heartbeat to be sent immediately, and adjust the address's maximum
4264 * number of retransmissions sent before an address is considered
4265 * unreachable. The following structure is used to access and modify an
4266 * address's parameters:
4268 * struct sctp_paddrparams {
4269 * sctp_assoc_t spp_assoc_id;
4270 * struct sockaddr_storage spp_address;
4271 * uint32_t spp_hbinterval;
4272 * uint16_t spp_pathmaxrxt;
4273 * uint32_t spp_pathmtu;
4274 * uint32_t spp_sackdelay;
4275 * uint32_t spp_flags;
4278 * spp_assoc_id - (one-to-many style socket) This is filled in the
4279 * application, and identifies the association for
4281 * spp_address - This specifies which address is of interest.
4282 * spp_hbinterval - This contains the value of the heartbeat interval,
4283 * in milliseconds. If a value of zero
4284 * is present in this field then no changes are to
4285 * be made to this parameter.
4286 * spp_pathmaxrxt - This contains the maximum number of
4287 * retransmissions before this address shall be
4288 * considered unreachable. If a value of zero
4289 * is present in this field then no changes are to
4290 * be made to this parameter.
4291 * spp_pathmtu - When Path MTU discovery is disabled the value
4292 * specified here will be the "fixed" path mtu.
4293 * Note that if the spp_address field is empty
4294 * then all associations on this address will
4295 * have this fixed path mtu set upon them.
4297 * spp_sackdelay - When delayed sack is enabled, this value specifies
4298 * the number of milliseconds that sacks will be delayed
4299 * for. This value will apply to all addresses of an
4300 * association if the spp_address field is empty. Note
4301 * also, that if delayed sack is enabled and this
4302 * value is set to 0, no change is made to the last
4303 * recorded delayed sack timer value.
4305 * spp_flags - These flags are used to control various features
4306 * on an association. The flag field may contain
4307 * zero or more of the following options.
4309 * SPP_HB_ENABLE - Enable heartbeats on the
4310 * specified address. Note that if the address
4311 * field is empty all addresses for the association
4312 * have heartbeats enabled upon them.
4314 * SPP_HB_DISABLE - Disable heartbeats on the
4315 * speicifed address. Note that if the address
4316 * field is empty all addresses for the association
4317 * will have their heartbeats disabled. Note also
4318 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4319 * mutually exclusive, only one of these two should
4320 * be specified. Enabling both fields will have
4321 * undetermined results.
4323 * SPP_HB_DEMAND - Request a user initiated heartbeat
4324 * to be made immediately.
4326 * SPP_PMTUD_ENABLE - This field will enable PMTU
4327 * discovery upon the specified address. Note that
4328 * if the address feild is empty then all addresses
4329 * on the association are effected.
4331 * SPP_PMTUD_DISABLE - This field will disable PMTU
4332 * discovery upon the specified address. Note that
4333 * if the address feild is empty then all addresses
4334 * on the association are effected. Not also that
4335 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4336 * exclusive. Enabling both will have undetermined
4339 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4340 * on delayed sack. The time specified in spp_sackdelay
4341 * is used to specify the sack delay for this address. Note
4342 * that if spp_address is empty then all addresses will
4343 * enable delayed sack and take on the sack delay
4344 * value specified in spp_sackdelay.
4345 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4346 * off delayed sack. If the spp_address field is blank then
4347 * delayed sack is disabled for the entire association. Note
4348 * also that this field is mutually exclusive to
4349 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4352 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4353 char __user *optval, int __user *optlen)
4355 struct sctp_paddrparams params;
4356 struct sctp_transport *trans = NULL;
4357 struct sctp_association *asoc = NULL;
4358 struct sctp_sock *sp = sctp_sk(sk);
4360 if (len < sizeof(struct sctp_paddrparams))
4362 len = sizeof(struct sctp_paddrparams);
4363 if (copy_from_user(¶ms, optval, len))
4366 /* If an address other than INADDR_ANY is specified, and
4367 * no transport is found, then the request is invalid.
4369 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4370 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4371 params.spp_assoc_id);
4373 SCTP_DEBUG_PRINTK("Failed no transport\n");
4378 /* Get association, if assoc_id != 0 and the socket is a one
4379 * to many style socket, and an association was not found, then
4380 * the id was invalid.
4382 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4383 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4384 SCTP_DEBUG_PRINTK("Failed no association\n");
4389 /* Fetch transport values. */
4390 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4391 params.spp_pathmtu = trans->pathmtu;
4392 params.spp_pathmaxrxt = trans->pathmaxrxt;
4393 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4395 /*draft-11 doesn't say what to return in spp_flags*/
4396 params.spp_flags = trans->param_flags;
4398 /* Fetch association values. */
4399 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4400 params.spp_pathmtu = asoc->pathmtu;
4401 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4402 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4404 /*draft-11 doesn't say what to return in spp_flags*/
4405 params.spp_flags = asoc->param_flags;
4407 /* Fetch socket values. */
4408 params.spp_hbinterval = sp->hbinterval;
4409 params.spp_pathmtu = sp->pathmtu;
4410 params.spp_sackdelay = sp->sackdelay;
4411 params.spp_pathmaxrxt = sp->pathmaxrxt;
4413 /*draft-11 doesn't say what to return in spp_flags*/
4414 params.spp_flags = sp->param_flags;
4417 if (copy_to_user(optval, ¶ms, len))
4420 if (put_user(len, optlen))
4427 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4429 * This option will effect the way delayed acks are performed. This
4430 * option allows you to get or set the delayed ack time, in
4431 * milliseconds. It also allows changing the delayed ack frequency.
4432 * Changing the frequency to 1 disables the delayed sack algorithm. If
4433 * the assoc_id is 0, then this sets or gets the endpoints default
4434 * values. If the assoc_id field is non-zero, then the set or get
4435 * effects the specified association for the one to many model (the
4436 * assoc_id field is ignored by the one to one model). Note that if
4437 * sack_delay or sack_freq are 0 when setting this option, then the
4438 * current values will remain unchanged.
4440 * struct sctp_sack_info {
4441 * sctp_assoc_t sack_assoc_id;
4442 * uint32_t sack_delay;
4443 * uint32_t sack_freq;
4446 * sack_assoc_id - This parameter, indicates which association the user
4447 * is performing an action upon. Note that if this field's value is
4448 * zero then the endpoints default value is changed (effecting future
4449 * associations only).
4451 * sack_delay - This parameter contains the number of milliseconds that
4452 * the user is requesting the delayed ACK timer be set to. Note that
4453 * this value is defined in the standard to be between 200 and 500
4456 * sack_freq - This parameter contains the number of packets that must
4457 * be received before a sack is sent without waiting for the delay
4458 * timer to expire. The default value for this is 2, setting this
4459 * value to 1 will disable the delayed sack algorithm.
4461 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4462 char __user *optval,
4465 struct sctp_sack_info params;
4466 struct sctp_association *asoc = NULL;
4467 struct sctp_sock *sp = sctp_sk(sk);
4469 if (len >= sizeof(struct sctp_sack_info)) {
4470 len = sizeof(struct sctp_sack_info);
4472 if (copy_from_user(¶ms, optval, len))
4474 } else if (len == sizeof(struct sctp_assoc_value)) {
4475 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4476 pr_warn("Use struct sctp_sack_info instead\n");
4477 if (copy_from_user(¶ms, optval, len))
4482 /* Get association, if sack_assoc_id != 0 and the socket is a one
4483 * to many style socket, and an association was not found, then
4484 * the id was invalid.
4486 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4487 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4491 /* Fetch association values. */
4492 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4493 params.sack_delay = jiffies_to_msecs(
4495 params.sack_freq = asoc->sackfreq;
4498 params.sack_delay = 0;
4499 params.sack_freq = 1;
4502 /* Fetch socket values. */
4503 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4504 params.sack_delay = sp->sackdelay;
4505 params.sack_freq = sp->sackfreq;
4507 params.sack_delay = 0;
4508 params.sack_freq = 1;
4512 if (copy_to_user(optval, ¶ms, len))
4515 if (put_user(len, optlen))
4521 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4523 * Applications can specify protocol parameters for the default association
4524 * initialization. The option name argument to setsockopt() and getsockopt()
4527 * Setting initialization parameters is effective only on an unconnected
4528 * socket (for UDP-style sockets only future associations are effected
4529 * by the change). With TCP-style sockets, this option is inherited by
4530 * sockets derived from a listener socket.
4532 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4534 if (len < sizeof(struct sctp_initmsg))
4536 len = sizeof(struct sctp_initmsg);
4537 if (put_user(len, optlen))
4539 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4545 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4546 char __user *optval, int __user *optlen)
4548 struct sctp_association *asoc;
4550 struct sctp_getaddrs getaddrs;
4551 struct sctp_transport *from;
4553 union sctp_addr temp;
4554 struct sctp_sock *sp = sctp_sk(sk);
4559 if (len < sizeof(struct sctp_getaddrs))
4562 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4565 /* For UDP-style sockets, id specifies the association to query. */
4566 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4570 to = optval + offsetof(struct sctp_getaddrs,addrs);
4571 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4573 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4575 memcpy(&temp, &from->ipaddr, sizeof(temp));
4576 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4577 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4578 if (space_left < addrlen)
4580 if (copy_to_user(to, &temp, addrlen))
4584 space_left -= addrlen;
4587 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4589 bytes_copied = ((char __user *)to) - optval;
4590 if (put_user(bytes_copied, optlen))
4596 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4597 size_t space_left, int *bytes_copied)
4599 struct sctp_sockaddr_entry *addr;
4600 union sctp_addr temp;
4605 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4609 if ((PF_INET == sk->sk_family) &&
4610 (AF_INET6 == addr->a.sa.sa_family))
4612 if ((PF_INET6 == sk->sk_family) &&
4613 inet_v6_ipv6only(sk) &&
4614 (AF_INET == addr->a.sa.sa_family))
4616 memcpy(&temp, &addr->a, sizeof(temp));
4617 if (!temp.v4.sin_port)
4618 temp.v4.sin_port = htons(port);
4620 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4622 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4623 if (space_left < addrlen) {
4627 memcpy(to, &temp, addrlen);
4631 space_left -= addrlen;
4632 *bytes_copied += addrlen;
4640 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4641 char __user *optval, int __user *optlen)
4643 struct sctp_bind_addr *bp;
4644 struct sctp_association *asoc;
4646 struct sctp_getaddrs getaddrs;
4647 struct sctp_sockaddr_entry *addr;
4649 union sctp_addr temp;
4650 struct sctp_sock *sp = sctp_sk(sk);
4654 int bytes_copied = 0;
4658 if (len < sizeof(struct sctp_getaddrs))
4661 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4665 * For UDP-style sockets, id specifies the association to query.
4666 * If the id field is set to the value '0' then the locally bound
4667 * addresses are returned without regard to any particular
4670 if (0 == getaddrs.assoc_id) {
4671 bp = &sctp_sk(sk)->ep->base.bind_addr;
4673 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4676 bp = &asoc->base.bind_addr;
4679 to = optval + offsetof(struct sctp_getaddrs,addrs);
4680 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4682 addrs = kmalloc(space_left, GFP_KERNEL);
4686 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4687 * addresses from the global local address list.
4689 if (sctp_list_single_entry(&bp->address_list)) {
4690 addr = list_entry(bp->address_list.next,
4691 struct sctp_sockaddr_entry, list);
4692 if (sctp_is_any(sk, &addr->a)) {
4693 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4694 space_left, &bytes_copied);
4704 /* Protection on the bound address list is not needed since
4705 * in the socket option context we hold a socket lock and
4706 * thus the bound address list can't change.
4708 list_for_each_entry(addr, &bp->address_list, list) {
4709 memcpy(&temp, &addr->a, sizeof(temp));
4710 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4711 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4712 if (space_left < addrlen) {
4713 err = -ENOMEM; /*fixme: right error?*/
4716 memcpy(buf, &temp, addrlen);
4718 bytes_copied += addrlen;
4720 space_left -= addrlen;
4724 if (copy_to_user(to, addrs, bytes_copied)) {
4728 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4732 if (put_user(bytes_copied, optlen))
4739 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4741 * Requests that the local SCTP stack use the enclosed peer address as
4742 * the association primary. The enclosed address must be one of the
4743 * association peer's addresses.
4745 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4746 char __user *optval, int __user *optlen)
4748 struct sctp_prim prim;
4749 struct sctp_association *asoc;
4750 struct sctp_sock *sp = sctp_sk(sk);
4752 if (len < sizeof(struct sctp_prim))
4755 len = sizeof(struct sctp_prim);
4757 if (copy_from_user(&prim, optval, len))
4760 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4764 if (!asoc->peer.primary_path)
4767 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4768 asoc->peer.primary_path->af_specific->sockaddr_len);
4770 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4771 (union sctp_addr *)&prim.ssp_addr);
4773 if (put_user(len, optlen))
4775 if (copy_to_user(optval, &prim, len))
4782 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4784 * Requests that the local endpoint set the specified Adaptation Layer
4785 * Indication parameter for all future INIT and INIT-ACK exchanges.
4787 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4788 char __user *optval, int __user *optlen)
4790 struct sctp_setadaptation adaptation;
4792 if (len < sizeof(struct sctp_setadaptation))
4795 len = sizeof(struct sctp_setadaptation);
4797 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4799 if (put_user(len, optlen))
4801 if (copy_to_user(optval, &adaptation, len))
4809 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4811 * Applications that wish to use the sendto() system call may wish to
4812 * specify a default set of parameters that would normally be supplied
4813 * through the inclusion of ancillary data. This socket option allows
4814 * such an application to set the default sctp_sndrcvinfo structure.
4817 * The application that wishes to use this socket option simply passes
4818 * in to this call the sctp_sndrcvinfo structure defined in Section
4819 * 5.2.2) The input parameters accepted by this call include
4820 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4821 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4822 * to this call if the caller is using the UDP model.
4824 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4826 static int sctp_getsockopt_default_send_param(struct sock *sk,
4827 int len, char __user *optval,
4830 struct sctp_sndrcvinfo info;
4831 struct sctp_association *asoc;
4832 struct sctp_sock *sp = sctp_sk(sk);
4834 if (len < sizeof(struct sctp_sndrcvinfo))
4837 len = sizeof(struct sctp_sndrcvinfo);
4839 if (copy_from_user(&info, optval, len))
4842 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4843 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4847 info.sinfo_stream = asoc->default_stream;
4848 info.sinfo_flags = asoc->default_flags;
4849 info.sinfo_ppid = asoc->default_ppid;
4850 info.sinfo_context = asoc->default_context;
4851 info.sinfo_timetolive = asoc->default_timetolive;
4853 info.sinfo_stream = sp->default_stream;
4854 info.sinfo_flags = sp->default_flags;
4855 info.sinfo_ppid = sp->default_ppid;
4856 info.sinfo_context = sp->default_context;
4857 info.sinfo_timetolive = sp->default_timetolive;
4860 if (put_user(len, optlen))
4862 if (copy_to_user(optval, &info, len))
4870 * 7.1.5 SCTP_NODELAY
4872 * Turn on/off any Nagle-like algorithm. This means that packets are
4873 * generally sent as soon as possible and no unnecessary delays are
4874 * introduced, at the cost of more packets in the network. Expects an
4875 * integer boolean flag.
4878 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4879 char __user *optval, int __user *optlen)
4883 if (len < sizeof(int))
4887 val = (sctp_sk(sk)->nodelay == 1);
4888 if (put_user(len, optlen))
4890 if (copy_to_user(optval, &val, len))
4897 * 7.1.1 SCTP_RTOINFO
4899 * The protocol parameters used to initialize and bound retransmission
4900 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4901 * and modify these parameters.
4902 * All parameters are time values, in milliseconds. A value of 0, when
4903 * modifying the parameters, indicates that the current value should not
4907 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4908 char __user *optval,
4909 int __user *optlen) {
4910 struct sctp_rtoinfo rtoinfo;
4911 struct sctp_association *asoc;
4913 if (len < sizeof (struct sctp_rtoinfo))
4916 len = sizeof(struct sctp_rtoinfo);
4918 if (copy_from_user(&rtoinfo, optval, len))
4921 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4923 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4926 /* Values corresponding to the specific association. */
4928 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4929 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4930 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4932 /* Values corresponding to the endpoint. */
4933 struct sctp_sock *sp = sctp_sk(sk);
4935 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4936 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4937 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4940 if (put_user(len, optlen))
4943 if (copy_to_user(optval, &rtoinfo, len))
4951 * 7.1.2 SCTP_ASSOCINFO
4953 * This option is used to tune the maximum retransmission attempts
4954 * of the association.
4955 * Returns an error if the new association retransmission value is
4956 * greater than the sum of the retransmission value of the peer.
4957 * See [SCTP] for more information.
4960 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4961 char __user *optval,
4965 struct sctp_assocparams assocparams;
4966 struct sctp_association *asoc;
4967 struct list_head *pos;
4970 if (len < sizeof (struct sctp_assocparams))
4973 len = sizeof(struct sctp_assocparams);
4975 if (copy_from_user(&assocparams, optval, len))
4978 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4980 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4983 /* Values correspoinding to the specific association */
4985 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4986 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4987 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4988 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4990 (asoc->cookie_life.tv_usec
4993 list_for_each(pos, &asoc->peer.transport_addr_list) {
4997 assocparams.sasoc_number_peer_destinations = cnt;
4999 /* Values corresponding to the endpoint */
5000 struct sctp_sock *sp = sctp_sk(sk);
5002 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5003 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5004 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5005 assocparams.sasoc_cookie_life =
5006 sp->assocparams.sasoc_cookie_life;
5007 assocparams.sasoc_number_peer_destinations =
5009 sasoc_number_peer_destinations;
5012 if (put_user(len, optlen))
5015 if (copy_to_user(optval, &assocparams, len))
5022 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5024 * This socket option is a boolean flag which turns on or off mapped V4
5025 * addresses. If this option is turned on and the socket is type
5026 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5027 * If this option is turned off, then no mapping will be done of V4
5028 * addresses and a user will receive both PF_INET6 and PF_INET type
5029 * addresses on the socket.
5031 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5032 char __user *optval, int __user *optlen)
5035 struct sctp_sock *sp = sctp_sk(sk);
5037 if (len < sizeof(int))
5042 if (put_user(len, optlen))
5044 if (copy_to_user(optval, &val, len))
5051 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5052 * (chapter and verse is quoted at sctp_setsockopt_context())
5054 static int sctp_getsockopt_context(struct sock *sk, int len,
5055 char __user *optval, int __user *optlen)
5057 struct sctp_assoc_value params;
5058 struct sctp_sock *sp;
5059 struct sctp_association *asoc;
5061 if (len < sizeof(struct sctp_assoc_value))
5064 len = sizeof(struct sctp_assoc_value);
5066 if (copy_from_user(¶ms, optval, len))
5071 if (params.assoc_id != 0) {
5072 asoc = sctp_id2assoc(sk, params.assoc_id);
5075 params.assoc_value = asoc->default_rcv_context;
5077 params.assoc_value = sp->default_rcv_context;
5080 if (put_user(len, optlen))
5082 if (copy_to_user(optval, ¶ms, len))
5089 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5090 * This option will get or set the maximum size to put in any outgoing
5091 * SCTP DATA chunk. If a message is larger than this size it will be
5092 * fragmented by SCTP into the specified size. Note that the underlying
5093 * SCTP implementation may fragment into smaller sized chunks when the
5094 * PMTU of the underlying association is smaller than the value set by
5095 * the user. The default value for this option is '0' which indicates
5096 * the user is NOT limiting fragmentation and only the PMTU will effect
5097 * SCTP's choice of DATA chunk size. Note also that values set larger
5098 * than the maximum size of an IP datagram will effectively let SCTP
5099 * control fragmentation (i.e. the same as setting this option to 0).
5101 * The following structure is used to access and modify this parameter:
5103 * struct sctp_assoc_value {
5104 * sctp_assoc_t assoc_id;
5105 * uint32_t assoc_value;
5108 * assoc_id: This parameter is ignored for one-to-one style sockets.
5109 * For one-to-many style sockets this parameter indicates which
5110 * association the user is performing an action upon. Note that if
5111 * this field's value is zero then the endpoints default value is
5112 * changed (effecting future associations only).
5113 * assoc_value: This parameter specifies the maximum size in bytes.
5115 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5116 char __user *optval, int __user *optlen)
5118 struct sctp_assoc_value params;
5119 struct sctp_association *asoc;
5121 if (len == sizeof(int)) {
5122 pr_warn("Use of int in maxseg socket option deprecated\n");
5123 pr_warn("Use struct sctp_assoc_value instead\n");
5124 params.assoc_id = 0;
5125 } else if (len >= sizeof(struct sctp_assoc_value)) {
5126 len = sizeof(struct sctp_assoc_value);
5127 if (copy_from_user(¶ms, optval, sizeof(params)))
5132 asoc = sctp_id2assoc(sk, params.assoc_id);
5133 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5137 params.assoc_value = asoc->frag_point;
5139 params.assoc_value = sctp_sk(sk)->user_frag;
5141 if (put_user(len, optlen))
5143 if (len == sizeof(int)) {
5144 if (copy_to_user(optval, ¶ms.assoc_value, len))
5147 if (copy_to_user(optval, ¶ms, len))
5155 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5156 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5158 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5159 char __user *optval, int __user *optlen)
5163 if (len < sizeof(int))
5168 val = sctp_sk(sk)->frag_interleave;
5169 if (put_user(len, optlen))
5171 if (copy_to_user(optval, &val, len))
5178 * 7.1.25. Set or Get the sctp partial delivery point
5179 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5181 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5182 char __user *optval,
5187 if (len < sizeof(u32))
5192 val = sctp_sk(sk)->pd_point;
5193 if (put_user(len, optlen))
5195 if (copy_to_user(optval, &val, len))
5202 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5203 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5205 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5206 char __user *optval,
5209 struct sctp_assoc_value params;
5210 struct sctp_sock *sp;
5211 struct sctp_association *asoc;
5213 if (len == sizeof(int)) {
5214 pr_warn("Use of int in max_burst socket option deprecated\n");
5215 pr_warn("Use struct sctp_assoc_value instead\n");
5216 params.assoc_id = 0;
5217 } else if (len >= sizeof(struct sctp_assoc_value)) {
5218 len = sizeof(struct sctp_assoc_value);
5219 if (copy_from_user(¶ms, optval, len))
5226 if (params.assoc_id != 0) {
5227 asoc = sctp_id2assoc(sk, params.assoc_id);
5230 params.assoc_value = asoc->max_burst;
5232 params.assoc_value = sp->max_burst;
5234 if (len == sizeof(int)) {
5235 if (copy_to_user(optval, ¶ms.assoc_value, len))
5238 if (copy_to_user(optval, ¶ms, len))
5246 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5247 char __user *optval, int __user *optlen)
5249 struct sctp_hmacalgo __user *p = (void __user *)optval;
5250 struct sctp_hmac_algo_param *hmacs;
5254 if (!sctp_auth_enable)
5257 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5258 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5260 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5263 len = sizeof(struct sctp_hmacalgo) + data_len;
5264 num_idents = data_len / sizeof(u16);
5266 if (put_user(len, optlen))
5268 if (put_user(num_idents, &p->shmac_num_idents))
5270 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5275 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5276 char __user *optval, int __user *optlen)
5278 struct sctp_authkeyid val;
5279 struct sctp_association *asoc;
5281 if (!sctp_auth_enable)
5284 if (len < sizeof(struct sctp_authkeyid))
5286 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5289 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5290 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5294 val.scact_keynumber = asoc->active_key_id;
5296 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5298 len = sizeof(struct sctp_authkeyid);
5299 if (put_user(len, optlen))
5301 if (copy_to_user(optval, &val, len))
5307 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5308 char __user *optval, int __user *optlen)
5310 struct sctp_authchunks __user *p = (void __user *)optval;
5311 struct sctp_authchunks val;
5312 struct sctp_association *asoc;
5313 struct sctp_chunks_param *ch;
5317 if (!sctp_auth_enable)
5320 if (len < sizeof(struct sctp_authchunks))
5323 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5326 to = p->gauth_chunks;
5327 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5331 ch = asoc->peer.peer_chunks;
5335 /* See if the user provided enough room for all the data */
5336 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5337 if (len < num_chunks)
5340 if (copy_to_user(to, ch->chunks, num_chunks))
5343 len = sizeof(struct sctp_authchunks) + num_chunks;
5344 if (put_user(len, optlen)) return -EFAULT;
5345 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5350 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5351 char __user *optval, int __user *optlen)
5353 struct sctp_authchunks __user *p = (void __user *)optval;
5354 struct sctp_authchunks val;
5355 struct sctp_association *asoc;
5356 struct sctp_chunks_param *ch;
5360 if (!sctp_auth_enable)
5363 if (len < sizeof(struct sctp_authchunks))
5366 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5369 to = p->gauth_chunks;
5370 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5371 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5375 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5377 ch = sctp_sk(sk)->ep->auth_chunk_list;
5382 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5383 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5386 if (copy_to_user(to, ch->chunks, num_chunks))
5389 len = sizeof(struct sctp_authchunks) + num_chunks;
5390 if (put_user(len, optlen))
5392 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5399 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5400 * This option gets the current number of associations that are attached
5401 * to a one-to-many style socket. The option value is an uint32_t.
5403 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5404 char __user *optval, int __user *optlen)
5406 struct sctp_sock *sp = sctp_sk(sk);
5407 struct sctp_association *asoc;
5410 if (sctp_style(sk, TCP))
5413 if (len < sizeof(u32))
5418 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5422 if (put_user(len, optlen))
5424 if (copy_to_user(optval, &val, len))
5431 * 8.1.23 SCTP_AUTO_ASCONF
5432 * See the corresponding setsockopt entry as description
5434 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5435 char __user *optval, int __user *optlen)
5439 if (len < sizeof(int))
5443 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5445 if (put_user(len, optlen))
5447 if (copy_to_user(optval, &val, len))
5453 * 8.2.6. Get the Current Identifiers of Associations
5454 * (SCTP_GET_ASSOC_ID_LIST)
5456 * This option gets the current list of SCTP association identifiers of
5457 * the SCTP associations handled by a one-to-many style socket.
5459 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5460 char __user *optval, int __user *optlen)
5462 struct sctp_sock *sp = sctp_sk(sk);
5463 struct sctp_association *asoc;
5464 struct sctp_assoc_ids *ids;
5467 if (sctp_style(sk, TCP))
5470 if (len < sizeof(struct sctp_assoc_ids))
5473 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5477 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5480 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5482 ids = kmalloc(len, GFP_KERNEL);
5486 ids->gaids_number_of_ids = num;
5488 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5489 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5492 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5501 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5502 char __user *optval, int __user *optlen)
5507 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5510 /* I can hardly begin to describe how wrong this is. This is
5511 * so broken as to be worse than useless. The API draft
5512 * REALLY is NOT helpful here... I am not convinced that the
5513 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5514 * are at all well-founded.
5516 if (level != SOL_SCTP) {
5517 struct sctp_af *af = sctp_sk(sk)->pf->af;
5519 retval = af->getsockopt(sk, level, optname, optval, optlen);
5523 if (get_user(len, optlen))
5530 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5532 case SCTP_DISABLE_FRAGMENTS:
5533 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5537 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5539 case SCTP_AUTOCLOSE:
5540 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5542 case SCTP_SOCKOPT_PEELOFF:
5543 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5545 case SCTP_PEER_ADDR_PARAMS:
5546 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5549 case SCTP_DELAYED_SACK:
5550 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5554 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5556 case SCTP_GET_PEER_ADDRS:
5557 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5560 case SCTP_GET_LOCAL_ADDRS:
5561 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5564 case SCTP_SOCKOPT_CONNECTX3:
5565 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5567 case SCTP_DEFAULT_SEND_PARAM:
5568 retval = sctp_getsockopt_default_send_param(sk, len,
5571 case SCTP_PRIMARY_ADDR:
5572 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5575 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5578 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5580 case SCTP_ASSOCINFO:
5581 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5583 case SCTP_I_WANT_MAPPED_V4_ADDR:
5584 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5587 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5589 case SCTP_GET_PEER_ADDR_INFO:
5590 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5593 case SCTP_ADAPTATION_LAYER:
5594 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5598 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5600 case SCTP_FRAGMENT_INTERLEAVE:
5601 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5604 case SCTP_PARTIAL_DELIVERY_POINT:
5605 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5608 case SCTP_MAX_BURST:
5609 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5612 case SCTP_AUTH_CHUNK:
5613 case SCTP_AUTH_DELETE_KEY:
5614 retval = -EOPNOTSUPP;
5616 case SCTP_HMAC_IDENT:
5617 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5619 case SCTP_AUTH_ACTIVE_KEY:
5620 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5622 case SCTP_PEER_AUTH_CHUNKS:
5623 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5626 case SCTP_LOCAL_AUTH_CHUNKS:
5627 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5630 case SCTP_GET_ASSOC_NUMBER:
5631 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5633 case SCTP_GET_ASSOC_ID_LIST:
5634 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5636 case SCTP_AUTO_ASCONF:
5637 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
5640 retval = -ENOPROTOOPT;
5644 sctp_release_sock(sk);
5648 static void sctp_hash(struct sock *sk)
5653 static void sctp_unhash(struct sock *sk)
5658 /* Check if port is acceptable. Possibly find first available port.
5660 * The port hash table (contained in the 'global' SCTP protocol storage
5661 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5662 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5663 * list (the list number is the port number hashed out, so as you
5664 * would expect from a hash function, all the ports in a given list have
5665 * such a number that hashes out to the same list number; you were
5666 * expecting that, right?); so each list has a set of ports, with a
5667 * link to the socket (struct sock) that uses it, the port number and
5668 * a fastreuse flag (FIXME: NPI ipg).
5670 static struct sctp_bind_bucket *sctp_bucket_create(
5671 struct sctp_bind_hashbucket *head, unsigned short snum);
5673 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5675 struct sctp_bind_hashbucket *head; /* hash list */
5676 struct sctp_bind_bucket *pp; /* hash list port iterator */
5677 struct hlist_node *node;
5678 unsigned short snum;
5681 snum = ntohs(addr->v4.sin_port);
5683 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5684 sctp_local_bh_disable();
5687 /* Search for an available port. */
5688 int low, high, remaining, index;
5691 inet_get_local_port_range(&low, &high);
5692 remaining = (high - low) + 1;
5693 rover = net_random() % remaining + low;
5697 if ((rover < low) || (rover > high))
5699 if (inet_is_reserved_local_port(rover))
5701 index = sctp_phashfn(rover);
5702 head = &sctp_port_hashtable[index];
5703 sctp_spin_lock(&head->lock);
5704 sctp_for_each_hentry(pp, node, &head->chain)
5705 if (pp->port == rover)
5709 sctp_spin_unlock(&head->lock);
5710 } while (--remaining > 0);
5712 /* Exhausted local port range during search? */
5717 /* OK, here is the one we will use. HEAD (the port
5718 * hash table list entry) is non-NULL and we hold it's
5723 /* We are given an specific port number; we verify
5724 * that it is not being used. If it is used, we will
5725 * exahust the search in the hash list corresponding
5726 * to the port number (snum) - we detect that with the
5727 * port iterator, pp being NULL.
5729 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5730 sctp_spin_lock(&head->lock);
5731 sctp_for_each_hentry(pp, node, &head->chain) {
5732 if (pp->port == snum)
5739 if (!hlist_empty(&pp->owner)) {
5740 /* We had a port hash table hit - there is an
5741 * available port (pp != NULL) and it is being
5742 * used by other socket (pp->owner not empty); that other
5743 * socket is going to be sk2.
5745 int reuse = sk->sk_reuse;
5748 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5749 if (pp->fastreuse && sk->sk_reuse &&
5750 sk->sk_state != SCTP_SS_LISTENING)
5753 /* Run through the list of sockets bound to the port
5754 * (pp->port) [via the pointers bind_next and
5755 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5756 * we get the endpoint they describe and run through
5757 * the endpoint's list of IP (v4 or v6) addresses,
5758 * comparing each of the addresses with the address of
5759 * the socket sk. If we find a match, then that means
5760 * that this port/socket (sk) combination are already
5763 sk_for_each_bound(sk2, node, &pp->owner) {
5764 struct sctp_endpoint *ep2;
5765 ep2 = sctp_sk(sk2)->ep;
5768 (reuse && sk2->sk_reuse &&
5769 sk2->sk_state != SCTP_SS_LISTENING))
5772 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5773 sctp_sk(sk2), sctp_sk(sk))) {
5778 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5781 /* If there was a hash table miss, create a new port. */
5783 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5786 /* In either case (hit or miss), make sure fastreuse is 1 only
5787 * if sk->sk_reuse is too (that is, if the caller requested
5788 * SO_REUSEADDR on this socket -sk-).
5790 if (hlist_empty(&pp->owner)) {
5791 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5795 } else if (pp->fastreuse &&
5796 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5799 /* We are set, so fill up all the data in the hash table
5800 * entry, tie the socket list information with the rest of the
5801 * sockets FIXME: Blurry, NPI (ipg).
5804 if (!sctp_sk(sk)->bind_hash) {
5805 inet_sk(sk)->inet_num = snum;
5806 sk_add_bind_node(sk, &pp->owner);
5807 sctp_sk(sk)->bind_hash = pp;
5812 sctp_spin_unlock(&head->lock);
5815 sctp_local_bh_enable();
5819 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5820 * port is requested.
5822 static int sctp_get_port(struct sock *sk, unsigned short snum)
5825 union sctp_addr addr;
5826 struct sctp_af *af = sctp_sk(sk)->pf->af;
5828 /* Set up a dummy address struct from the sk. */
5829 af->from_sk(&addr, sk);
5830 addr.v4.sin_port = htons(snum);
5832 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5833 ret = sctp_get_port_local(sk, &addr);
5839 * Move a socket to LISTENING state.
5841 SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
5843 struct sctp_sock *sp = sctp_sk(sk);
5844 struct sctp_endpoint *ep = sp->ep;
5845 struct crypto_hash *tfm = NULL;
5847 /* Allocate HMAC for generating cookie. */
5848 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5849 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5851 net_info_ratelimited("failed to load transform for %s: %ld\n",
5852 sctp_hmac_alg, PTR_ERR(tfm));
5855 sctp_sk(sk)->hmac = tfm;
5859 * If a bind() or sctp_bindx() is not called prior to a listen()
5860 * call that allows new associations to be accepted, the system
5861 * picks an ephemeral port and will choose an address set equivalent
5862 * to binding with a wildcard address.
5864 * This is not currently spelled out in the SCTP sockets
5865 * extensions draft, but follows the practice as seen in TCP
5869 sk->sk_state = SCTP_SS_LISTENING;
5870 if (!ep->base.bind_addr.port) {
5871 if (sctp_autobind(sk))
5874 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
5875 sk->sk_state = SCTP_SS_CLOSED;
5880 sk->sk_max_ack_backlog = backlog;
5881 sctp_hash_endpoint(ep);
5886 * 4.1.3 / 5.1.3 listen()
5888 * By default, new associations are not accepted for UDP style sockets.
5889 * An application uses listen() to mark a socket as being able to
5890 * accept new associations.
5892 * On TCP style sockets, applications use listen() to ready the SCTP
5893 * endpoint for accepting inbound associations.
5895 * On both types of endpoints a backlog of '0' disables listening.
5897 * Move a socket to LISTENING state.
5899 int sctp_inet_listen(struct socket *sock, int backlog)
5901 struct sock *sk = sock->sk;
5902 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5905 if (unlikely(backlog < 0))
5910 /* Peeled-off sockets are not allowed to listen(). */
5911 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
5914 if (sock->state != SS_UNCONNECTED)
5917 /* If backlog is zero, disable listening. */
5919 if (sctp_sstate(sk, CLOSED))
5923 sctp_unhash_endpoint(ep);
5924 sk->sk_state = SCTP_SS_CLOSED;
5926 sctp_sk(sk)->bind_hash->fastreuse = 1;
5930 /* If we are already listening, just update the backlog */
5931 if (sctp_sstate(sk, LISTENING))
5932 sk->sk_max_ack_backlog = backlog;
5934 err = sctp_listen_start(sk, backlog);
5941 sctp_release_sock(sk);
5946 * This function is done by modeling the current datagram_poll() and the
5947 * tcp_poll(). Note that, based on these implementations, we don't
5948 * lock the socket in this function, even though it seems that,
5949 * ideally, locking or some other mechanisms can be used to ensure
5950 * the integrity of the counters (sndbuf and wmem_alloc) used
5951 * in this place. We assume that we don't need locks either until proven
5954 * Another thing to note is that we include the Async I/O support
5955 * here, again, by modeling the current TCP/UDP code. We don't have
5956 * a good way to test with it yet.
5958 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5960 struct sock *sk = sock->sk;
5961 struct sctp_sock *sp = sctp_sk(sk);
5964 poll_wait(file, sk_sleep(sk), wait);
5966 /* A TCP-style listening socket becomes readable when the accept queue
5969 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5970 return (!list_empty(&sp->ep->asocs)) ?
5971 (POLLIN | POLLRDNORM) : 0;
5975 /* Is there any exceptional events? */
5976 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5978 if (sk->sk_shutdown & RCV_SHUTDOWN)
5979 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
5980 if (sk->sk_shutdown == SHUTDOWN_MASK)
5983 /* Is it readable? Reconsider this code with TCP-style support. */
5984 if (!skb_queue_empty(&sk->sk_receive_queue))
5985 mask |= POLLIN | POLLRDNORM;
5987 /* The association is either gone or not ready. */
5988 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5991 /* Is it writable? */
5992 if (sctp_writeable(sk)) {
5993 mask |= POLLOUT | POLLWRNORM;
5995 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5997 * Since the socket is not locked, the buffer
5998 * might be made available after the writeable check and
5999 * before the bit is set. This could cause a lost I/O
6000 * signal. tcp_poll() has a race breaker for this race
6001 * condition. Based on their implementation, we put
6002 * in the following code to cover it as well.
6004 if (sctp_writeable(sk))
6005 mask |= POLLOUT | POLLWRNORM;
6010 /********************************************************************
6011 * 2nd Level Abstractions
6012 ********************************************************************/
6014 static struct sctp_bind_bucket *sctp_bucket_create(
6015 struct sctp_bind_hashbucket *head, unsigned short snum)
6017 struct sctp_bind_bucket *pp;
6019 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6021 SCTP_DBG_OBJCNT_INC(bind_bucket);
6024 INIT_HLIST_HEAD(&pp->owner);
6025 hlist_add_head(&pp->node, &head->chain);
6030 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6031 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6033 if (pp && hlist_empty(&pp->owner)) {
6034 __hlist_del(&pp->node);
6035 kmem_cache_free(sctp_bucket_cachep, pp);
6036 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6040 /* Release this socket's reference to a local port. */
6041 static inline void __sctp_put_port(struct sock *sk)
6043 struct sctp_bind_hashbucket *head =
6044 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)];
6045 struct sctp_bind_bucket *pp;
6047 sctp_spin_lock(&head->lock);
6048 pp = sctp_sk(sk)->bind_hash;
6049 __sk_del_bind_node(sk);
6050 sctp_sk(sk)->bind_hash = NULL;
6051 inet_sk(sk)->inet_num = 0;
6052 sctp_bucket_destroy(pp);
6053 sctp_spin_unlock(&head->lock);
6056 void sctp_put_port(struct sock *sk)
6058 sctp_local_bh_disable();
6059 __sctp_put_port(sk);
6060 sctp_local_bh_enable();
6064 * The system picks an ephemeral port and choose an address set equivalent
6065 * to binding with a wildcard address.
6066 * One of those addresses will be the primary address for the association.
6067 * This automatically enables the multihoming capability of SCTP.
6069 static int sctp_autobind(struct sock *sk)
6071 union sctp_addr autoaddr;
6075 /* Initialize a local sockaddr structure to INADDR_ANY. */
6076 af = sctp_sk(sk)->pf->af;
6078 port = htons(inet_sk(sk)->inet_num);
6079 af->inaddr_any(&autoaddr, port);
6081 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6084 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6087 * 4.2 The cmsghdr Structure *
6089 * When ancillary data is sent or received, any number of ancillary data
6090 * objects can be specified by the msg_control and msg_controllen members of
6091 * the msghdr structure, because each object is preceded by
6092 * a cmsghdr structure defining the object's length (the cmsg_len member).
6093 * Historically Berkeley-derived implementations have passed only one object
6094 * at a time, but this API allows multiple objects to be
6095 * passed in a single call to sendmsg() or recvmsg(). The following example
6096 * shows two ancillary data objects in a control buffer.
6098 * |<--------------------------- msg_controllen -------------------------->|
6101 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6103 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6106 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6108 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6111 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6112 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6114 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6116 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6123 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6124 sctp_cmsgs_t *cmsgs)
6126 struct cmsghdr *cmsg;
6127 struct msghdr *my_msg = (struct msghdr *)msg;
6129 for (cmsg = CMSG_FIRSTHDR(msg);
6131 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6132 if (!CMSG_OK(my_msg, cmsg))
6135 /* Should we parse this header or ignore? */
6136 if (cmsg->cmsg_level != IPPROTO_SCTP)
6139 /* Strictly check lengths following example in SCM code. */
6140 switch (cmsg->cmsg_type) {
6142 /* SCTP Socket API Extension
6143 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6145 * This cmsghdr structure provides information for
6146 * initializing new SCTP associations with sendmsg().
6147 * The SCTP_INITMSG socket option uses this same data
6148 * structure. This structure is not used for
6151 * cmsg_level cmsg_type cmsg_data[]
6152 * ------------ ------------ ----------------------
6153 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6155 if (cmsg->cmsg_len !=
6156 CMSG_LEN(sizeof(struct sctp_initmsg)))
6158 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6162 /* SCTP Socket API Extension
6163 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6165 * This cmsghdr structure specifies SCTP options for
6166 * sendmsg() and describes SCTP header information
6167 * about a received message through recvmsg().
6169 * cmsg_level cmsg_type cmsg_data[]
6170 * ------------ ------------ ----------------------
6171 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6173 if (cmsg->cmsg_len !=
6174 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6178 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6180 /* Minimally, validate the sinfo_flags. */
6181 if (cmsgs->info->sinfo_flags &
6182 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6183 SCTP_ABORT | SCTP_EOF))
6195 * Wait for a packet..
6196 * Note: This function is the same function as in core/datagram.c
6197 * with a few modifications to make lksctp work.
6199 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6204 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6206 /* Socket errors? */
6207 error = sock_error(sk);
6211 if (!skb_queue_empty(&sk->sk_receive_queue))
6214 /* Socket shut down? */
6215 if (sk->sk_shutdown & RCV_SHUTDOWN)
6218 /* Sequenced packets can come disconnected. If so we report the
6223 /* Is there a good reason to think that we may receive some data? */
6224 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6227 /* Handle signals. */
6228 if (signal_pending(current))
6231 /* Let another process have a go. Since we are going to sleep
6232 * anyway. Note: This may cause odd behaviors if the message
6233 * does not fit in the user's buffer, but this seems to be the
6234 * only way to honor MSG_DONTWAIT realistically.
6236 sctp_release_sock(sk);
6237 *timeo_p = schedule_timeout(*timeo_p);
6241 finish_wait(sk_sleep(sk), &wait);
6245 error = sock_intr_errno(*timeo_p);
6248 finish_wait(sk_sleep(sk), &wait);
6253 /* Receive a datagram.
6254 * Note: This is pretty much the same routine as in core/datagram.c
6255 * with a few changes to make lksctp work.
6257 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6258 int noblock, int *err)
6261 struct sk_buff *skb;
6264 timeo = sock_rcvtimeo(sk, noblock);
6266 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6267 timeo, MAX_SCHEDULE_TIMEOUT);
6270 /* Again only user level code calls this function,
6271 * so nothing interrupt level
6272 * will suddenly eat the receive_queue.
6274 * Look at current nfs client by the way...
6275 * However, this function was correct in any case. 8)
6277 if (flags & MSG_PEEK) {
6278 spin_lock_bh(&sk->sk_receive_queue.lock);
6279 skb = skb_peek(&sk->sk_receive_queue);
6281 atomic_inc(&skb->users);
6282 spin_unlock_bh(&sk->sk_receive_queue.lock);
6284 skb = skb_dequeue(&sk->sk_receive_queue);
6290 /* Caller is allowed not to check sk->sk_err before calling. */
6291 error = sock_error(sk);
6295 if (sk->sk_shutdown & RCV_SHUTDOWN)
6298 /* User doesn't want to wait. */
6302 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6311 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6312 static void __sctp_write_space(struct sctp_association *asoc)
6314 struct sock *sk = asoc->base.sk;
6315 struct socket *sock = sk->sk_socket;
6317 if ((sctp_wspace(asoc) > 0) && sock) {
6318 if (waitqueue_active(&asoc->wait))
6319 wake_up_interruptible(&asoc->wait);
6321 if (sctp_writeable(sk)) {
6322 wait_queue_head_t *wq = sk_sleep(sk);
6324 if (wq && waitqueue_active(wq))
6325 wake_up_interruptible(wq);
6327 /* Note that we try to include the Async I/O support
6328 * here by modeling from the current TCP/UDP code.
6329 * We have not tested with it yet.
6331 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6332 sock_wake_async(sock,
6333 SOCK_WAKE_SPACE, POLL_OUT);
6338 /* Do accounting for the sndbuf space.
6339 * Decrement the used sndbuf space of the corresponding association by the
6340 * data size which was just transmitted(freed).
6342 static void sctp_wfree(struct sk_buff *skb)
6344 struct sctp_association *asoc;
6345 struct sctp_chunk *chunk;
6348 /* Get the saved chunk pointer. */
6349 chunk = *((struct sctp_chunk **)(skb->cb));
6352 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6353 sizeof(struct sk_buff) +
6354 sizeof(struct sctp_chunk);
6356 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6359 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6361 sk->sk_wmem_queued -= skb->truesize;
6362 sk_mem_uncharge(sk, skb->truesize);
6365 __sctp_write_space(asoc);
6367 sctp_association_put(asoc);
6370 /* Do accounting for the receive space on the socket.
6371 * Accounting for the association is done in ulpevent.c
6372 * We set this as a destructor for the cloned data skbs so that
6373 * accounting is done at the correct time.
6375 void sctp_sock_rfree(struct sk_buff *skb)
6377 struct sock *sk = skb->sk;
6378 struct sctp_ulpevent *event = sctp_skb2event(skb);
6380 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6383 * Mimic the behavior of sock_rfree
6385 sk_mem_uncharge(sk, event->rmem_len);
6389 /* Helper function to wait for space in the sndbuf. */
6390 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6393 struct sock *sk = asoc->base.sk;
6395 long current_timeo = *timeo_p;
6398 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6399 asoc, (long)(*timeo_p), msg_len);
6401 /* Increment the association's refcnt. */
6402 sctp_association_hold(asoc);
6404 /* Wait on the association specific sndbuf space. */
6406 prepare_to_wait_exclusive(&asoc->wait, &wait,
6407 TASK_INTERRUPTIBLE);
6410 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6413 if (signal_pending(current))
6414 goto do_interrupted;
6415 if (msg_len <= sctp_wspace(asoc))
6418 /* Let another process have a go. Since we are going
6421 sctp_release_sock(sk);
6422 current_timeo = schedule_timeout(current_timeo);
6423 BUG_ON(sk != asoc->base.sk);
6426 *timeo_p = current_timeo;
6430 finish_wait(&asoc->wait, &wait);
6432 /* Release the association's refcnt. */
6433 sctp_association_put(asoc);
6442 err = sock_intr_errno(*timeo_p);
6450 void sctp_data_ready(struct sock *sk, int len)
6452 struct socket_wq *wq;
6455 wq = rcu_dereference(sk->sk_wq);
6456 if (wq_has_sleeper(wq))
6457 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6458 POLLRDNORM | POLLRDBAND);
6459 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6463 /* If socket sndbuf has changed, wake up all per association waiters. */
6464 void sctp_write_space(struct sock *sk)
6466 struct sctp_association *asoc;
6468 /* Wake up the tasks in each wait queue. */
6469 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6470 __sctp_write_space(asoc);
6474 /* Is there any sndbuf space available on the socket?
6476 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6477 * associations on the same socket. For a UDP-style socket with
6478 * multiple associations, it is possible for it to be "unwriteable"
6479 * prematurely. I assume that this is acceptable because
6480 * a premature "unwriteable" is better than an accidental "writeable" which
6481 * would cause an unwanted block under certain circumstances. For the 1-1
6482 * UDP-style sockets or TCP-style sockets, this code should work.
6485 static int sctp_writeable(struct sock *sk)
6489 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
6495 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6496 * returns immediately with EINPROGRESS.
6498 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6500 struct sock *sk = asoc->base.sk;
6502 long current_timeo = *timeo_p;
6505 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6508 /* Increment the association's refcnt. */
6509 sctp_association_hold(asoc);
6512 prepare_to_wait_exclusive(&asoc->wait, &wait,
6513 TASK_INTERRUPTIBLE);
6516 if (sk->sk_shutdown & RCV_SHUTDOWN)
6518 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6521 if (signal_pending(current))
6522 goto do_interrupted;
6524 if (sctp_state(asoc, ESTABLISHED))
6527 /* Let another process have a go. Since we are going
6530 sctp_release_sock(sk);
6531 current_timeo = schedule_timeout(current_timeo);
6534 *timeo_p = current_timeo;
6538 finish_wait(&asoc->wait, &wait);
6540 /* Release the association's refcnt. */
6541 sctp_association_put(asoc);
6546 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6549 err = -ECONNREFUSED;
6553 err = sock_intr_errno(*timeo_p);
6561 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6563 struct sctp_endpoint *ep;
6567 ep = sctp_sk(sk)->ep;
6571 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
6572 TASK_INTERRUPTIBLE);
6574 if (list_empty(&ep->asocs)) {
6575 sctp_release_sock(sk);
6576 timeo = schedule_timeout(timeo);
6581 if (!sctp_sstate(sk, LISTENING))
6585 if (!list_empty(&ep->asocs))
6588 err = sock_intr_errno(timeo);
6589 if (signal_pending(current))
6597 finish_wait(sk_sleep(sk), &wait);
6602 static void sctp_wait_for_close(struct sock *sk, long timeout)
6607 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6608 if (list_empty(&sctp_sk(sk)->ep->asocs))
6610 sctp_release_sock(sk);
6611 timeout = schedule_timeout(timeout);
6613 } while (!signal_pending(current) && timeout);
6615 finish_wait(sk_sleep(sk), &wait);
6618 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6620 struct sk_buff *frag;
6625 /* Don't forget the fragments. */
6626 skb_walk_frags(skb, frag)
6627 sctp_skb_set_owner_r_frag(frag, sk);
6630 sctp_skb_set_owner_r(skb, sk);
6633 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6634 struct sctp_association *asoc)
6636 struct inet_sock *inet = inet_sk(sk);
6637 struct inet_sock *newinet;
6639 newsk->sk_type = sk->sk_type;
6640 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6641 newsk->sk_flags = sk->sk_flags;
6642 newsk->sk_no_check = sk->sk_no_check;
6643 newsk->sk_reuse = sk->sk_reuse;
6645 newsk->sk_shutdown = sk->sk_shutdown;
6646 newsk->sk_destruct = inet_sock_destruct;
6647 newsk->sk_family = sk->sk_family;
6648 newsk->sk_protocol = IPPROTO_SCTP;
6649 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6650 newsk->sk_sndbuf = sk->sk_sndbuf;
6651 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6652 newsk->sk_lingertime = sk->sk_lingertime;
6653 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6654 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6656 newinet = inet_sk(newsk);
6658 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6659 * getsockname() and getpeername()
6661 newinet->inet_sport = inet->inet_sport;
6662 newinet->inet_saddr = inet->inet_saddr;
6663 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6664 newinet->inet_dport = htons(asoc->peer.port);
6665 newinet->pmtudisc = inet->pmtudisc;
6666 newinet->inet_id = asoc->next_tsn ^ jiffies;
6668 newinet->uc_ttl = inet->uc_ttl;
6669 newinet->mc_loop = 1;
6670 newinet->mc_ttl = 1;
6671 newinet->mc_index = 0;
6672 newinet->mc_list = NULL;
6675 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6676 * and its messages to the newsk.
6678 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6679 struct sctp_association *assoc,
6680 sctp_socket_type_t type)
6682 struct sctp_sock *oldsp = sctp_sk(oldsk);
6683 struct sctp_sock *newsp = sctp_sk(newsk);
6684 struct sctp_bind_bucket *pp; /* hash list port iterator */
6685 struct sctp_endpoint *newep = newsp->ep;
6686 struct sk_buff *skb, *tmp;
6687 struct sctp_ulpevent *event;
6688 struct sctp_bind_hashbucket *head;
6689 struct list_head tmplist;
6691 /* Migrate socket buffer sizes and all the socket level options to the
6694 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6695 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6696 /* Brute force copy old sctp opt. */
6697 if (oldsp->do_auto_asconf) {
6698 memcpy(&tmplist, &newsp->auto_asconf_list, sizeof(tmplist));
6699 inet_sk_copy_descendant(newsk, oldsk);
6700 memcpy(&newsp->auto_asconf_list, &tmplist, sizeof(tmplist));
6702 inet_sk_copy_descendant(newsk, oldsk);
6704 /* Restore the ep value that was overwritten with the above structure
6710 /* Hook this new socket in to the bind_hash list. */
6711 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)];
6712 sctp_local_bh_disable();
6713 sctp_spin_lock(&head->lock);
6714 pp = sctp_sk(oldsk)->bind_hash;
6715 sk_add_bind_node(newsk, &pp->owner);
6716 sctp_sk(newsk)->bind_hash = pp;
6717 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
6718 sctp_spin_unlock(&head->lock);
6719 sctp_local_bh_enable();
6721 /* Copy the bind_addr list from the original endpoint to the new
6722 * endpoint so that we can handle restarts properly
6724 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6725 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6727 /* Move any messages in the old socket's receive queue that are for the
6728 * peeled off association to the new socket's receive queue.
6730 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6731 event = sctp_skb2event(skb);
6732 if (event->asoc == assoc) {
6733 __skb_unlink(skb, &oldsk->sk_receive_queue);
6734 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6735 sctp_skb_set_owner_r_frag(skb, newsk);
6739 /* Clean up any messages pending delivery due to partial
6740 * delivery. Three cases:
6741 * 1) No partial deliver; no work.
6742 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6743 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6745 skb_queue_head_init(&newsp->pd_lobby);
6746 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6748 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6749 struct sk_buff_head *queue;
6751 /* Decide which queue to move pd_lobby skbs to. */
6752 if (assoc->ulpq.pd_mode) {
6753 queue = &newsp->pd_lobby;
6755 queue = &newsk->sk_receive_queue;
6757 /* Walk through the pd_lobby, looking for skbs that
6758 * need moved to the new socket.
6760 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6761 event = sctp_skb2event(skb);
6762 if (event->asoc == assoc) {
6763 __skb_unlink(skb, &oldsp->pd_lobby);
6764 __skb_queue_tail(queue, skb);
6765 sctp_skb_set_owner_r_frag(skb, newsk);
6769 /* Clear up any skbs waiting for the partial
6770 * delivery to finish.
6772 if (assoc->ulpq.pd_mode)
6773 sctp_clear_pd(oldsk, NULL);
6777 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
6778 sctp_skb_set_owner_r_frag(skb, newsk);
6780 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
6781 sctp_skb_set_owner_r_frag(skb, newsk);
6783 /* Set the type of socket to indicate that it is peeled off from the
6784 * original UDP-style socket or created with the accept() call on a
6785 * TCP-style socket..
6789 /* Mark the new socket "in-use" by the user so that any packets
6790 * that may arrive on the association after we've moved it are
6791 * queued to the backlog. This prevents a potential race between
6792 * backlog processing on the old socket and new-packet processing
6793 * on the new socket.
6795 * The caller has just allocated newsk so we can guarantee that other
6796 * paths won't try to lock it and then oldsk.
6798 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6799 sctp_assoc_migrate(assoc, newsk);
6801 /* If the association on the newsk is already closed before accept()
6802 * is called, set RCV_SHUTDOWN flag.
6804 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6805 newsk->sk_shutdown |= RCV_SHUTDOWN;
6807 newsk->sk_state = SCTP_SS_ESTABLISHED;
6808 sctp_release_sock(newsk);
6812 /* This proto struct describes the ULP interface for SCTP. */
6813 struct proto sctp_prot = {
6815 .owner = THIS_MODULE,
6816 .close = sctp_close,
6817 .connect = sctp_connect,
6818 .disconnect = sctp_disconnect,
6819 .accept = sctp_accept,
6820 .ioctl = sctp_ioctl,
6821 .init = sctp_init_sock,
6822 .destroy = sctp_destroy_sock,
6823 .shutdown = sctp_shutdown,
6824 .setsockopt = sctp_setsockopt,
6825 .getsockopt = sctp_getsockopt,
6826 .sendmsg = sctp_sendmsg,
6827 .recvmsg = sctp_recvmsg,
6829 .backlog_rcv = sctp_backlog_rcv,
6831 .unhash = sctp_unhash,
6832 .get_port = sctp_get_port,
6833 .obj_size = sizeof(struct sctp_sock),
6834 .sysctl_mem = sysctl_sctp_mem,
6835 .sysctl_rmem = sysctl_sctp_rmem,
6836 .sysctl_wmem = sysctl_sctp_wmem,
6837 .memory_pressure = &sctp_memory_pressure,
6838 .enter_memory_pressure = sctp_enter_memory_pressure,
6839 .memory_allocated = &sctp_memory_allocated,
6840 .sockets_allocated = &sctp_sockets_allocated,
6843 #if IS_ENABLED(CONFIG_IPV6)
6845 struct proto sctpv6_prot = {
6847 .owner = THIS_MODULE,
6848 .close = sctp_close,
6849 .connect = sctp_connect,
6850 .disconnect = sctp_disconnect,
6851 .accept = sctp_accept,
6852 .ioctl = sctp_ioctl,
6853 .init = sctp_init_sock,
6854 .destroy = sctp_destroy_sock,
6855 .shutdown = sctp_shutdown,
6856 .setsockopt = sctp_setsockopt,
6857 .getsockopt = sctp_getsockopt,
6858 .sendmsg = sctp_sendmsg,
6859 .recvmsg = sctp_recvmsg,
6861 .backlog_rcv = sctp_backlog_rcv,
6863 .unhash = sctp_unhash,
6864 .get_port = sctp_get_port,
6865 .obj_size = sizeof(struct sctp6_sock),
6866 .sysctl_mem = sysctl_sctp_mem,
6867 .sysctl_rmem = sysctl_sctp_rmem,
6868 .sysctl_wmem = sysctl_sctp_wmem,
6869 .memory_pressure = &sctp_memory_pressure,
6870 .enter_memory_pressure = sctp_enter_memory_pressure,
6871 .memory_allocated = &sctp_memory_allocated,
6872 .sockets_allocated = &sctp_sockets_allocated,
6874 #endif /* IS_ENABLED(CONFIG_IPV6) */