1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
10 * This file is part of the SCTP kernel implementation
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
19 * Please send any bug reports or fixes you make to the
21 * lksctp developers <linux-sctp@vger.kernel.org>
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
58 #include <net/route.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
63 #include <linux/socket.h> /* for sa_family_t */
64 #include <linux/export.h>
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
68 #include <net/sctp/stream_sched.h>
70 /* Forward declarations for internal helper functions. */
71 static bool sctp_writeable(struct sock *sk);
72 static void sctp_wfree(struct sk_buff *skb);
73 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
75 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
76 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
77 static int sctp_wait_for_accept(struct sock *sk, long timeo);
78 static void sctp_wait_for_close(struct sock *sk, long timeo);
79 static void sctp_destruct_sock(struct sock *sk);
80 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
81 union sctp_addr *addr, int len);
82 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
83 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
84 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
85 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf(struct sctp_association *asoc,
87 struct sctp_chunk *chunk);
88 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
89 static int sctp_autobind(struct sock *sk);
90 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
91 struct sctp_association *assoc,
92 enum sctp_socket_type type);
94 static unsigned long sctp_memory_pressure;
95 static atomic_long_t sctp_memory_allocated;
96 struct percpu_counter sctp_sockets_allocated;
98 static void sctp_enter_memory_pressure(struct sock *sk)
100 sctp_memory_pressure = 1;
104 /* Get the sndbuf space available at the time on the association. */
105 static inline int sctp_wspace(struct sctp_association *asoc)
107 struct sock *sk = asoc->base.sk;
109 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
110 : sk_stream_wspace(sk);
113 /* Increment the used sndbuf space count of the corresponding association by
114 * the size of the outgoing data chunk.
115 * Also, set the skb destructor for sndbuf accounting later.
117 * Since it is always 1-1 between chunk and skb, and also a new skb is always
118 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
119 * destructor in the data chunk skb for the purpose of the sndbuf space
122 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
124 struct sctp_association *asoc = chunk->asoc;
125 struct sock *sk = asoc->base.sk;
127 /* The sndbuf space is tracked per association. */
128 sctp_association_hold(asoc);
131 sctp_auth_shkey_hold(chunk->shkey);
133 skb_set_owner_w(chunk->skb, sk);
135 chunk->skb->destructor = sctp_wfree;
136 /* Save the chunk pointer in skb for sctp_wfree to use later. */
137 skb_shinfo(chunk->skb)->destructor_arg = chunk;
139 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
140 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
141 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 sk_mem_charge(sk, chunk->skb->truesize);
145 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
147 skb_orphan(chunk->skb);
150 #define traverse_and_process() \
153 if (msg == prev_msg) \
155 list_for_each_entry(c, &msg->chunks, frag_list) { \
156 if ((clear && asoc->base.sk == c->skb->sk) || \
157 (!clear && asoc->base.sk != c->skb->sk)) \
163 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
165 void (*cb)(struct sctp_chunk *))
168 struct sctp_datamsg *msg, *prev_msg = NULL;
169 struct sctp_outq *q = &asoc->outqueue;
170 struct sctp_chunk *chunk, *c;
171 struct sctp_transport *t;
173 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
175 traverse_and_process();
177 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
178 traverse_and_process();
180 list_for_each_entry(chunk, &q->sacked, transmitted_list)
181 traverse_and_process();
183 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
184 traverse_and_process();
186 list_for_each_entry(chunk, &q->out_chunk_list, list)
187 traverse_and_process();
190 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
191 void (*cb)(struct sk_buff *, struct sock *))
194 struct sk_buff *skb, *tmp;
196 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
199 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
202 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206 /* Verify that this is a valid address. */
207 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
212 /* Verify basic sockaddr. */
213 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217 /* Is this a valid SCTP address? */
218 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
221 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
227 /* Look up the association by its id. If this is not a UDP-style
228 * socket, the ID field is always ignored.
230 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
232 struct sctp_association *asoc = NULL;
234 /* If this is not a UDP-style socket, assoc id should be ignored. */
235 if (!sctp_style(sk, UDP)) {
236 /* Return NULL if the socket state is not ESTABLISHED. It
237 * could be a TCP-style listening socket or a socket which
238 * hasn't yet called connect() to establish an association.
240 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
243 /* Get the first and the only association from the list. */
244 if (!list_empty(&sctp_sk(sk)->ep->asocs))
245 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
246 struct sctp_association, asocs);
250 /* Otherwise this is a UDP-style socket. */
251 if (id <= SCTP_ALL_ASSOC)
254 spin_lock_bh(&sctp_assocs_id_lock);
255 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
256 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
258 spin_unlock_bh(&sctp_assocs_id_lock);
263 /* Look up the transport from an address and an assoc id. If both address and
264 * id are specified, the associations matching the address and the id should be
267 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
268 struct sockaddr_storage *addr,
271 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
272 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
273 union sctp_addr *laddr = (union sctp_addr *)addr;
274 struct sctp_transport *transport;
276 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
279 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
286 id_asoc = sctp_id2assoc(sk, id);
287 if (id_asoc && (id_asoc != addr_asoc))
290 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
291 (union sctp_addr *)addr);
296 /* API 3.1.2 bind() - UDP Style Syntax
297 * The syntax of bind() is,
299 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
301 * sd - the socket descriptor returned by socket().
302 * addr - the address structure (struct sockaddr_in or struct
303 * sockaddr_in6 [RFC 2553]),
304 * addr_len - the size of the address structure.
306 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
312 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
315 /* Disallow binding twice. */
316 if (!sctp_sk(sk)->ep->base.bind_addr.port)
317 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
327 static int sctp_get_port_local(struct sock *, union sctp_addr *);
329 /* Verify this is a valid sockaddr. */
330 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
331 union sctp_addr *addr, int len)
335 /* Check minimum size. */
336 if (len < sizeof (struct sockaddr))
339 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
342 if (addr->sa.sa_family == AF_INET6) {
343 if (len < SIN6_LEN_RFC2133)
345 /* V4 mapped address are really of AF_INET family */
346 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
347 !opt->pf->af_supported(AF_INET, opt))
351 /* If we get this far, af is valid. */
352 af = sctp_get_af_specific(addr->sa.sa_family);
354 if (len < af->sockaddr_len)
360 static void sctp_auto_asconf_init(struct sctp_sock *sp)
362 struct net *net = sock_net(&sp->inet.sk);
364 if (net->sctp.default_auto_asconf) {
365 spin_lock(&net->sctp.addr_wq_lock);
366 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
367 spin_unlock(&net->sctp.addr_wq_lock);
368 sp->do_auto_asconf = 1;
372 /* Bind a local address either to an endpoint or to an association. */
373 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
375 struct net *net = sock_net(sk);
376 struct sctp_sock *sp = sctp_sk(sk);
377 struct sctp_endpoint *ep = sp->ep;
378 struct sctp_bind_addr *bp = &ep->base.bind_addr;
383 /* Common sockaddr verification. */
384 af = sctp_sockaddr_af(sp, addr, len);
386 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
387 __func__, sk, addr, len);
391 snum = ntohs(addr->v4.sin_port);
393 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
394 __func__, sk, &addr->sa, bp->port, snum, len);
396 /* PF specific bind() address verification. */
397 if (!sp->pf->bind_verify(sp, addr))
398 return -EADDRNOTAVAIL;
400 /* We must either be unbound, or bind to the same port.
401 * It's OK to allow 0 ports if we are already bound.
402 * We'll just inhert an already bound port in this case
407 else if (snum != bp->port) {
408 pr_debug("%s: new port %d doesn't match existing port "
409 "%d\n", __func__, snum, bp->port);
414 if (snum && inet_port_requires_bind_service(net, snum) &&
415 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
418 /* See if the address matches any of the addresses we may have
419 * already bound before checking against other endpoints.
421 if (sctp_bind_addr_match(bp, addr, sp))
424 /* Make sure we are allowed to bind here.
425 * The function sctp_get_port_local() does duplicate address
428 addr->v4.sin_port = htons(snum);
429 if (sctp_get_port_local(sk, addr))
432 /* Refresh ephemeral port. */
434 bp->port = inet_sk(sk)->inet_num;
435 sctp_auto_asconf_init(sp);
438 /* Add the address to the bind address list.
439 * Use GFP_ATOMIC since BHs will be disabled.
441 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
442 SCTP_ADDR_SRC, GFP_ATOMIC);
448 /* Copy back into socket for getsockname() use. */
449 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
450 sp->pf->to_sk_saddr(addr, sk);
455 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
457 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
458 * at any one time. If a sender, after sending an ASCONF chunk, decides
459 * it needs to transfer another ASCONF Chunk, it MUST wait until the
460 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
461 * subsequent ASCONF. Note this restriction binds each side, so at any
462 * time two ASCONF may be in-transit on any given association (one sent
463 * from each endpoint).
465 static int sctp_send_asconf(struct sctp_association *asoc,
466 struct sctp_chunk *chunk)
470 /* If there is an outstanding ASCONF chunk, queue it for later
473 if (asoc->addip_last_asconf) {
474 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
478 /* Hold the chunk until an ASCONF_ACK is received. */
479 sctp_chunk_hold(chunk);
480 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
482 sctp_chunk_free(chunk);
484 asoc->addip_last_asconf = chunk;
490 /* Add a list of addresses as bind addresses to local endpoint or
493 * Basically run through each address specified in the addrs/addrcnt
494 * array/length pair, determine if it is IPv6 or IPv4 and call
495 * sctp_do_bind() on it.
497 * If any of them fails, then the operation will be reversed and the
498 * ones that were added will be removed.
500 * Only sctp_setsockopt_bindx() is supposed to call this function.
502 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
507 struct sockaddr *sa_addr;
510 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
514 for (cnt = 0; cnt < addrcnt; cnt++) {
515 /* The list may contain either IPv4 or IPv6 address;
516 * determine the address length for walking thru the list.
519 af = sctp_get_af_specific(sa_addr->sa_family);
525 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
528 addr_buf += af->sockaddr_len;
532 /* Failed. Cleanup the ones that have been added */
534 sctp_bindx_rem(sk, addrs, cnt);
542 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
543 * associations that are part of the endpoint indicating that a list of local
544 * addresses are added to the endpoint.
546 * If any of the addresses is already in the bind address list of the
547 * association, we do not send the chunk for that association. But it will not
548 * affect other associations.
550 * Only sctp_setsockopt_bindx() is supposed to call this function.
552 static int sctp_send_asconf_add_ip(struct sock *sk,
553 struct sockaddr *addrs,
556 struct sctp_sock *sp;
557 struct sctp_endpoint *ep;
558 struct sctp_association *asoc;
559 struct sctp_bind_addr *bp;
560 struct sctp_chunk *chunk;
561 struct sctp_sockaddr_entry *laddr;
562 union sctp_addr *addr;
563 union sctp_addr saveaddr;
573 if (!ep->asconf_enable)
576 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
577 __func__, sk, addrs, addrcnt);
579 list_for_each_entry(asoc, &ep->asocs, asocs) {
580 if (!asoc->peer.asconf_capable)
583 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
586 if (!sctp_state(asoc, ESTABLISHED))
589 /* Check if any address in the packed array of addresses is
590 * in the bind address list of the association. If so,
591 * do not send the asconf chunk to its peer, but continue with
592 * other associations.
595 for (i = 0; i < addrcnt; i++) {
597 af = sctp_get_af_specific(addr->v4.sin_family);
603 if (sctp_assoc_lookup_laddr(asoc, addr))
606 addr_buf += af->sockaddr_len;
611 /* Use the first valid address in bind addr list of
612 * association as Address Parameter of ASCONF CHUNK.
614 bp = &asoc->base.bind_addr;
615 p = bp->address_list.next;
616 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
617 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
618 addrcnt, SCTP_PARAM_ADD_IP);
624 /* Add the new addresses to the bind address list with
625 * use_as_src set to 0.
628 for (i = 0; i < addrcnt; i++) {
630 af = sctp_get_af_specific(addr->v4.sin_family);
631 memcpy(&saveaddr, addr, af->sockaddr_len);
632 retval = sctp_add_bind_addr(bp, &saveaddr,
634 SCTP_ADDR_NEW, GFP_ATOMIC);
635 addr_buf += af->sockaddr_len;
637 if (asoc->src_out_of_asoc_ok) {
638 struct sctp_transport *trans;
640 list_for_each_entry(trans,
641 &asoc->peer.transport_addr_list, transports) {
642 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
643 2*asoc->pathmtu, 4380));
644 trans->ssthresh = asoc->peer.i.a_rwnd;
645 trans->rto = asoc->rto_initial;
646 sctp_max_rto(asoc, trans);
647 trans->rtt = trans->srtt = trans->rttvar = 0;
648 /* Clear the source and route cache */
649 sctp_transport_route(trans, NULL,
650 sctp_sk(asoc->base.sk));
653 retval = sctp_send_asconf(asoc, chunk);
660 /* Remove a list of addresses from bind addresses list. Do not remove the
663 * Basically run through each address specified in the addrs/addrcnt
664 * array/length pair, determine if it is IPv6 or IPv4 and call
665 * sctp_del_bind() on it.
667 * If any of them fails, then the operation will be reversed and the
668 * ones that were removed will be added back.
670 * At least one address has to be left; if only one address is
671 * available, the operation will return -EBUSY.
673 * Only sctp_setsockopt_bindx() is supposed to call this function.
675 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
677 struct sctp_sock *sp = sctp_sk(sk);
678 struct sctp_endpoint *ep = sp->ep;
680 struct sctp_bind_addr *bp = &ep->base.bind_addr;
683 union sctp_addr *sa_addr;
686 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
687 __func__, sk, addrs, addrcnt);
690 for (cnt = 0; cnt < addrcnt; cnt++) {
691 /* If the bind address list is empty or if there is only one
692 * bind address, there is nothing more to be removed (we need
693 * at least one address here).
695 if (list_empty(&bp->address_list) ||
696 (sctp_list_single_entry(&bp->address_list))) {
702 af = sctp_get_af_specific(sa_addr->sa.sa_family);
708 if (!af->addr_valid(sa_addr, sp, NULL)) {
709 retval = -EADDRNOTAVAIL;
713 if (sa_addr->v4.sin_port &&
714 sa_addr->v4.sin_port != htons(bp->port)) {
719 if (!sa_addr->v4.sin_port)
720 sa_addr->v4.sin_port = htons(bp->port);
722 /* FIXME - There is probably a need to check if sk->sk_saddr and
723 * sk->sk_rcv_addr are currently set to one of the addresses to
724 * be removed. This is something which needs to be looked into
725 * when we are fixing the outstanding issues with multi-homing
726 * socket routing and failover schemes. Refer to comments in
727 * sctp_do_bind(). -daisy
729 retval = sctp_del_bind_addr(bp, sa_addr);
731 addr_buf += af->sockaddr_len;
734 /* Failed. Add the ones that has been removed back */
736 sctp_bindx_add(sk, addrs, cnt);
744 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
745 * the associations that are part of the endpoint indicating that a list of
746 * local addresses are removed from the endpoint.
748 * If any of the addresses is already in the bind address list of the
749 * association, we do not send the chunk for that association. But it will not
750 * affect other associations.
752 * Only sctp_setsockopt_bindx() is supposed to call this function.
754 static int sctp_send_asconf_del_ip(struct sock *sk,
755 struct sockaddr *addrs,
758 struct sctp_sock *sp;
759 struct sctp_endpoint *ep;
760 struct sctp_association *asoc;
761 struct sctp_transport *transport;
762 struct sctp_bind_addr *bp;
763 struct sctp_chunk *chunk;
764 union sctp_addr *laddr;
767 struct sctp_sockaddr_entry *saddr;
776 if (!ep->asconf_enable)
779 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
780 __func__, sk, addrs, addrcnt);
782 list_for_each_entry(asoc, &ep->asocs, asocs) {
784 if (!asoc->peer.asconf_capable)
787 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
790 if (!sctp_state(asoc, ESTABLISHED))
793 /* Check if any address in the packed array of addresses is
794 * not present in the bind address list of the association.
795 * If so, do not send the asconf chunk to its peer, but
796 * continue with other associations.
799 for (i = 0; i < addrcnt; i++) {
801 af = sctp_get_af_specific(laddr->v4.sin_family);
807 if (!sctp_assoc_lookup_laddr(asoc, laddr))
810 addr_buf += af->sockaddr_len;
815 /* Find one address in the association's bind address list
816 * that is not in the packed array of addresses. This is to
817 * make sure that we do not delete all the addresses in the
820 bp = &asoc->base.bind_addr;
821 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
823 if ((laddr == NULL) && (addrcnt == 1)) {
824 if (asoc->asconf_addr_del_pending)
826 asoc->asconf_addr_del_pending =
827 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
828 if (asoc->asconf_addr_del_pending == NULL) {
832 asoc->asconf_addr_del_pending->sa.sa_family =
834 asoc->asconf_addr_del_pending->v4.sin_port =
836 if (addrs->sa_family == AF_INET) {
837 struct sockaddr_in *sin;
839 sin = (struct sockaddr_in *)addrs;
840 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
841 } else if (addrs->sa_family == AF_INET6) {
842 struct sockaddr_in6 *sin6;
844 sin6 = (struct sockaddr_in6 *)addrs;
845 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
848 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
849 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
850 asoc->asconf_addr_del_pending);
852 asoc->src_out_of_asoc_ok = 1;
860 /* We do not need RCU protection throughout this loop
861 * because this is done under a socket lock from the
864 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
872 /* Reset use_as_src flag for the addresses in the bind address
873 * list that are to be deleted.
876 for (i = 0; i < addrcnt; i++) {
878 af = sctp_get_af_specific(laddr->v4.sin_family);
879 list_for_each_entry(saddr, &bp->address_list, list) {
880 if (sctp_cmp_addr_exact(&saddr->a, laddr))
881 saddr->state = SCTP_ADDR_DEL;
883 addr_buf += af->sockaddr_len;
886 /* Update the route and saddr entries for all the transports
887 * as some of the addresses in the bind address list are
888 * about to be deleted and cannot be used as source addresses.
890 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
892 sctp_transport_route(transport, NULL,
893 sctp_sk(asoc->base.sk));
897 /* We don't need to transmit ASCONF */
899 retval = sctp_send_asconf(asoc, chunk);
905 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
906 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
908 struct sock *sk = sctp_opt2sk(sp);
909 union sctp_addr *addr;
912 /* It is safe to write port space in caller. */
914 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
915 af = sctp_get_af_specific(addr->sa.sa_family);
918 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
921 if (addrw->state == SCTP_ADDR_NEW)
922 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
924 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
927 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
930 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
933 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
934 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
937 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
938 * Section 3.1.2 for this usage.
940 * addrs is a pointer to an array of one or more socket addresses. Each
941 * address is contained in its appropriate structure (i.e. struct
942 * sockaddr_in or struct sockaddr_in6) the family of the address type
943 * must be used to distinguish the address length (note that this
944 * representation is termed a "packed array" of addresses). The caller
945 * specifies the number of addresses in the array with addrcnt.
947 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
948 * -1, and sets errno to the appropriate error code.
950 * For SCTP, the port given in each socket address must be the same, or
951 * sctp_bindx() will fail, setting errno to EINVAL.
953 * The flags parameter is formed from the bitwise OR of zero or more of
954 * the following currently defined flags:
956 * SCTP_BINDX_ADD_ADDR
958 * SCTP_BINDX_REM_ADDR
960 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
961 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
962 * addresses from the association. The two flags are mutually exclusive;
963 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
964 * not remove all addresses from an association; sctp_bindx() will
965 * reject such an attempt with EINVAL.
967 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
968 * additional addresses with an endpoint after calling bind(). Or use
969 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
970 * socket is associated with so that no new association accepted will be
971 * associated with those addresses. If the endpoint supports dynamic
972 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
973 * endpoint to send the appropriate message to the peer to change the
974 * peers address lists.
976 * Adding and removing addresses from a connected association is
977 * optional functionality. Implementations that do not support this
978 * functionality should return EOPNOTSUPP.
980 * Basically do nothing but copying the addresses from user to kernel
981 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
982 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
985 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
988 * sk The sk of the socket
989 * addrs The pointer to the addresses
990 * addrssize Size of the addrs buffer
991 * op Operation to perform (add or remove, see the flags of
994 * Returns 0 if ok, <0 errno code on error.
996 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
997 int addrs_size, int op)
1002 struct sockaddr *sa_addr;
1003 void *addr_buf = addrs;
1006 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1007 __func__, sk, addr_buf, addrs_size, op);
1009 if (unlikely(addrs_size <= 0))
1012 /* Walk through the addrs buffer and count the number of addresses. */
1013 while (walk_size < addrs_size) {
1014 if (walk_size + sizeof(sa_family_t) > addrs_size)
1018 af = sctp_get_af_specific(sa_addr->sa_family);
1020 /* If the address family is not supported or if this address
1021 * causes the address buffer to overflow return EINVAL.
1023 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1026 addr_buf += af->sockaddr_len;
1027 walk_size += af->sockaddr_len;
1032 case SCTP_BINDX_ADD_ADDR:
1033 /* Allow security module to validate bindx addresses. */
1034 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1038 err = sctp_bindx_add(sk, addrs, addrcnt);
1041 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1042 case SCTP_BINDX_REM_ADDR:
1043 err = sctp_bindx_rem(sk, addrs, addrcnt);
1046 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1053 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1059 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1064 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1065 const union sctp_addr *daddr,
1066 const struct sctp_initmsg *init,
1067 struct sctp_transport **tp)
1069 struct sctp_association *asoc;
1070 struct sock *sk = ep->base.sk;
1071 struct net *net = sock_net(sk);
1072 enum sctp_scope scope;
1075 if (sctp_endpoint_is_peeled_off(ep, daddr))
1076 return -EADDRNOTAVAIL;
1078 if (!ep->base.bind_addr.port) {
1079 if (sctp_autobind(sk))
1082 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1083 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1087 scope = sctp_scope(daddr);
1088 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1092 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1096 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1105 if (init->sinit_num_ostreams) {
1106 __u16 outcnt = init->sinit_num_ostreams;
1108 asoc->c.sinit_num_ostreams = outcnt;
1109 /* outcnt has been changed, need to re-init stream */
1110 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1115 if (init->sinit_max_instreams)
1116 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1118 if (init->sinit_max_attempts)
1119 asoc->max_init_attempts = init->sinit_max_attempts;
1121 if (init->sinit_max_init_timeo)
1122 asoc->max_init_timeo =
1123 msecs_to_jiffies(init->sinit_max_init_timeo);
1127 sctp_association_free(asoc);
1131 static int sctp_connect_add_peer(struct sctp_association *asoc,
1132 union sctp_addr *daddr, int addr_len)
1134 struct sctp_endpoint *ep = asoc->ep;
1135 struct sctp_association *old;
1136 struct sctp_transport *t;
1139 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1143 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1144 if (old && old != asoc)
1145 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1148 if (sctp_endpoint_is_peeled_off(ep, daddr))
1149 return -EADDRNOTAVAIL;
1151 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1158 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1160 * Common routine for handling connect() and sctp_connectx().
1161 * Connect will come in with just a single address.
1163 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1164 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1166 struct sctp_sock *sp = sctp_sk(sk);
1167 struct sctp_endpoint *ep = sp->ep;
1168 struct sctp_transport *transport;
1169 struct sctp_association *asoc;
1170 void *addr_buf = kaddrs;
1171 union sctp_addr *daddr;
1176 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1177 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1181 af = sctp_get_af_specific(daddr->sa.sa_family);
1182 if (!af || af->sockaddr_len > addrs_size)
1185 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1189 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1191 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1194 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1197 asoc = transport->asoc;
1199 addr_buf += af->sockaddr_len;
1200 walk_size = af->sockaddr_len;
1201 while (walk_size < addrs_size) {
1203 if (walk_size + sizeof(sa_family_t) > addrs_size)
1207 af = sctp_get_af_specific(daddr->sa.sa_family);
1208 if (!af || af->sockaddr_len + walk_size > addrs_size)
1211 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1214 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1218 addr_buf += af->sockaddr_len;
1219 walk_size += af->sockaddr_len;
1222 /* In case the user of sctp_connectx() wants an association
1223 * id back, assign one now.
1226 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1231 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1235 /* Initialize sk's dport and daddr for getpeername() */
1236 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1237 sp->pf->to_sk_daddr(daddr, sk);
1241 *assoc_id = asoc->assoc_id;
1243 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1244 return sctp_wait_for_connect(asoc, &timeo);
1247 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1248 __func__, asoc, kaddrs, err);
1249 sctp_association_free(asoc);
1253 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1256 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1257 * sctp_assoc_t *asoc);
1259 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1260 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1261 * or IPv6 addresses.
1263 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1264 * Section 3.1.2 for this usage.
1266 * addrs is a pointer to an array of one or more socket addresses. Each
1267 * address is contained in its appropriate structure (i.e. struct
1268 * sockaddr_in or struct sockaddr_in6) the family of the address type
1269 * must be used to distengish the address length (note that this
1270 * representation is termed a "packed array" of addresses). The caller
1271 * specifies the number of addresses in the array with addrcnt.
1273 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1274 * the association id of the new association. On failure, sctp_connectx()
1275 * returns -1, and sets errno to the appropriate error code. The assoc_id
1276 * is not touched by the kernel.
1278 * For SCTP, the port given in each socket address must be the same, or
1279 * sctp_connectx() will fail, setting errno to EINVAL.
1281 * An application can use sctp_connectx to initiate an association with
1282 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1283 * allows a caller to specify multiple addresses at which a peer can be
1284 * reached. The way the SCTP stack uses the list of addresses to set up
1285 * the association is implementation dependent. This function only
1286 * specifies that the stack will try to make use of all the addresses in
1287 * the list when needed.
1289 * Note that the list of addresses passed in is only used for setting up
1290 * the association. It does not necessarily equal the set of addresses
1291 * the peer uses for the resulting association. If the caller wants to
1292 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1293 * retrieve them after the association has been set up.
1295 * Basically do nothing but copying the addresses from user to kernel
1296 * land and invoking either sctp_connectx(). This is used for tunneling
1297 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1299 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1302 * sk The sk of the socket
1303 * addrs The pointer to the addresses
1304 * addrssize Size of the addrs buffer
1306 * Returns >=0 if ok, <0 errno code on error.
1308 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1309 int addrs_size, sctp_assoc_t *assoc_id)
1311 int err = 0, flags = 0;
1313 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1314 __func__, sk, kaddrs, addrs_size);
1316 /* make sure the 1st addr's sa_family is accessible later */
1317 if (unlikely(addrs_size < sizeof(sa_family_t)))
1320 /* Allow security module to validate connectx addresses. */
1321 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1322 (struct sockaddr *)kaddrs,
1327 /* in-kernel sockets don't generally have a file allocated to them
1328 * if all they do is call sock_create_kern().
1330 if (sk->sk_socket->file)
1331 flags = sk->sk_socket->file->f_flags;
1333 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1337 * This is an older interface. It's kept for backward compatibility
1338 * to the option that doesn't provide association id.
1340 static int sctp_setsockopt_connectx_old(struct sock *sk,
1341 struct sockaddr *kaddrs,
1344 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1348 * New interface for the API. The since the API is done with a socket
1349 * option, to make it simple we feed back the association id is as a return
1350 * indication to the call. Error is always negative and association id is
1353 static int sctp_setsockopt_connectx(struct sock *sk,
1354 struct sockaddr *kaddrs,
1357 sctp_assoc_t assoc_id = 0;
1360 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1369 * New (hopefully final) interface for the API.
1370 * We use the sctp_getaddrs_old structure so that use-space library
1371 * can avoid any unnecessary allocations. The only different part
1372 * is that we store the actual length of the address buffer into the
1373 * addrs_num structure member. That way we can re-use the existing
1376 #ifdef CONFIG_COMPAT
1377 struct compat_sctp_getaddrs_old {
1378 sctp_assoc_t assoc_id;
1380 compat_uptr_t addrs; /* struct sockaddr * */
1384 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1385 char __user *optval,
1388 struct sctp_getaddrs_old param;
1389 sctp_assoc_t assoc_id = 0;
1390 struct sockaddr *kaddrs;
1393 #ifdef CONFIG_COMPAT
1394 if (in_compat_syscall()) {
1395 struct compat_sctp_getaddrs_old param32;
1397 if (len < sizeof(param32))
1399 if (copy_from_user(¶m32, optval, sizeof(param32)))
1402 param.assoc_id = param32.assoc_id;
1403 param.addr_num = param32.addr_num;
1404 param.addrs = compat_ptr(param32.addrs);
1408 if (len < sizeof(param))
1410 if (copy_from_user(¶m, optval, sizeof(param)))
1414 kaddrs = memdup_user(param.addrs, param.addr_num);
1416 return PTR_ERR(kaddrs);
1418 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1420 if (err == 0 || err == -EINPROGRESS) {
1421 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1423 if (put_user(sizeof(assoc_id), optlen))
1430 /* API 3.1.4 close() - UDP Style Syntax
1431 * Applications use close() to perform graceful shutdown (as described in
1432 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1433 * by a UDP-style socket.
1437 * ret = close(int sd);
1439 * sd - the socket descriptor of the associations to be closed.
1441 * To gracefully shutdown a specific association represented by the
1442 * UDP-style socket, an application should use the sendmsg() call,
1443 * passing no user data, but including the appropriate flag in the
1444 * ancillary data (see Section xxxx).
1446 * If sd in the close() call is a branched-off socket representing only
1447 * one association, the shutdown is performed on that association only.
1449 * 4.1.6 close() - TCP Style Syntax
1451 * Applications use close() to gracefully close down an association.
1455 * int close(int sd);
1457 * sd - the socket descriptor of the association to be closed.
1459 * After an application calls close() on a socket descriptor, no further
1460 * socket operations will succeed on that descriptor.
1462 * API 7.1.4 SO_LINGER
1464 * An application using the TCP-style socket can use this option to
1465 * perform the SCTP ABORT primitive. The linger option structure is:
1468 * int l_onoff; // option on/off
1469 * int l_linger; // linger time
1472 * To enable the option, set l_onoff to 1. If the l_linger value is set
1473 * to 0, calling close() is the same as the ABORT primitive. If the
1474 * value is set to a negative value, the setsockopt() call will return
1475 * an error. If the value is set to a positive value linger_time, the
1476 * close() can be blocked for at most linger_time ms. If the graceful
1477 * shutdown phase does not finish during this period, close() will
1478 * return but the graceful shutdown phase continues in the system.
1480 static void sctp_close(struct sock *sk, long timeout)
1482 struct net *net = sock_net(sk);
1483 struct sctp_endpoint *ep;
1484 struct sctp_association *asoc;
1485 struct list_head *pos, *temp;
1486 unsigned int data_was_unread;
1488 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1490 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1491 sk->sk_shutdown = SHUTDOWN_MASK;
1492 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1494 ep = sctp_sk(sk)->ep;
1496 /* Clean up any skbs sitting on the receive queue. */
1497 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1498 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1500 /* Walk all associations on an endpoint. */
1501 list_for_each_safe(pos, temp, &ep->asocs) {
1502 asoc = list_entry(pos, struct sctp_association, asocs);
1504 if (sctp_style(sk, TCP)) {
1505 /* A closed association can still be in the list if
1506 * it belongs to a TCP-style listening socket that is
1507 * not yet accepted. If so, free it. If not, send an
1508 * ABORT or SHUTDOWN based on the linger options.
1510 if (sctp_state(asoc, CLOSED)) {
1511 sctp_association_free(asoc);
1516 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1517 !skb_queue_empty(&asoc->ulpq.reasm) ||
1518 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1519 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1520 struct sctp_chunk *chunk;
1522 chunk = sctp_make_abort_user(asoc, NULL, 0);
1523 sctp_primitive_ABORT(net, asoc, chunk);
1525 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1528 /* On a TCP-style socket, block for at most linger_time if set. */
1529 if (sctp_style(sk, TCP) && timeout)
1530 sctp_wait_for_close(sk, timeout);
1532 /* This will run the backlog queue. */
1535 /* Supposedly, no process has access to the socket, but
1536 * the net layers still may.
1537 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1538 * held and that should be grabbed before socket lock.
1540 spin_lock_bh(&net->sctp.addr_wq_lock);
1541 bh_lock_sock_nested(sk);
1543 /* Hold the sock, since sk_common_release() will put sock_put()
1544 * and we have just a little more cleanup.
1547 sk_common_release(sk);
1550 spin_unlock_bh(&net->sctp.addr_wq_lock);
1554 SCTP_DBG_OBJCNT_DEC(sock);
1557 /* Handle EPIPE error. */
1558 static int sctp_error(struct sock *sk, int flags, int err)
1561 err = sock_error(sk) ? : -EPIPE;
1562 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1563 send_sig(SIGPIPE, current, 0);
1567 /* API 3.1.3 sendmsg() - UDP Style Syntax
1569 * An application uses sendmsg() and recvmsg() calls to transmit data to
1570 * and receive data from its peer.
1572 * ssize_t sendmsg(int socket, const struct msghdr *message,
1575 * socket - the socket descriptor of the endpoint.
1576 * message - pointer to the msghdr structure which contains a single
1577 * user message and possibly some ancillary data.
1579 * See Section 5 for complete description of the data
1582 * flags - flags sent or received with the user message, see Section
1583 * 5 for complete description of the flags.
1585 * Note: This function could use a rewrite especially when explicit
1586 * connect support comes in.
1588 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1590 static int sctp_msghdr_parse(const struct msghdr *msg,
1591 struct sctp_cmsgs *cmsgs);
1593 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1594 struct sctp_sndrcvinfo *srinfo,
1595 const struct msghdr *msg, size_t msg_len)
1600 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1603 if (msg_len > sk->sk_sndbuf)
1606 memset(cmsgs, 0, sizeof(*cmsgs));
1607 err = sctp_msghdr_parse(msg, cmsgs);
1609 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1613 memset(srinfo, 0, sizeof(*srinfo));
1614 if (cmsgs->srinfo) {
1615 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1616 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1617 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1618 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1619 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1620 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1624 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1625 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1626 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1627 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1628 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1631 if (cmsgs->prinfo) {
1632 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1633 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1634 cmsgs->prinfo->pr_policy);
1637 sflags = srinfo->sinfo_flags;
1638 if (!sflags && msg_len)
1641 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1644 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1645 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1648 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1654 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1655 struct sctp_cmsgs *cmsgs,
1656 union sctp_addr *daddr,
1657 struct sctp_transport **tp)
1659 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1660 struct sctp_association *asoc;
1661 struct cmsghdr *cmsg;
1662 __be32 flowinfo = 0;
1668 if (sflags & (SCTP_EOF | SCTP_ABORT))
1671 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1672 sctp_sstate(sk, CLOSING)))
1673 return -EADDRNOTAVAIL;
1675 /* Label connection socket for first association 1-to-many
1676 * style for client sequence socket()->sendmsg(). This
1677 * needs to be done before sctp_assoc_add_peer() as that will
1678 * set up the initial packet that needs to account for any
1679 * security ip options (CIPSO/CALIPSO) added to the packet.
1681 af = sctp_get_af_specific(daddr->sa.sa_family);
1684 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1685 (struct sockaddr *)daddr,
1690 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1695 if (!cmsgs->addrs_msg)
1698 if (daddr->sa.sa_family == AF_INET6)
1699 flowinfo = daddr->v6.sin6_flowinfo;
1701 /* sendv addr list parse */
1702 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1703 union sctp_addr _daddr;
1706 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1707 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1708 cmsg->cmsg_type != SCTP_DSTADDRV6))
1712 memset(daddr, 0, sizeof(*daddr));
1713 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1714 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1715 if (dlen < sizeof(struct in_addr)) {
1720 dlen = sizeof(struct in_addr);
1721 daddr->v4.sin_family = AF_INET;
1722 daddr->v4.sin_port = htons(asoc->peer.port);
1723 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1725 if (dlen < sizeof(struct in6_addr)) {
1730 dlen = sizeof(struct in6_addr);
1731 daddr->v6.sin6_flowinfo = flowinfo;
1732 daddr->v6.sin6_family = AF_INET6;
1733 daddr->v6.sin6_port = htons(asoc->peer.port);
1734 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1737 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1745 sctp_association_free(asoc);
1749 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1750 __u16 sflags, struct msghdr *msg,
1753 struct sock *sk = asoc->base.sk;
1754 struct net *net = sock_net(sk);
1756 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1759 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1760 !sctp_state(asoc, ESTABLISHED))
1763 if (sflags & SCTP_EOF) {
1764 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1765 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1770 if (sflags & SCTP_ABORT) {
1771 struct sctp_chunk *chunk;
1773 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1777 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1778 sctp_primitive_ABORT(net, asoc, chunk);
1779 iov_iter_revert(&msg->msg_iter, msg_len);
1787 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1788 struct msghdr *msg, size_t msg_len,
1789 struct sctp_transport *transport,
1790 struct sctp_sndrcvinfo *sinfo)
1792 struct sock *sk = asoc->base.sk;
1793 struct sctp_sock *sp = sctp_sk(sk);
1794 struct net *net = sock_net(sk);
1795 struct sctp_datamsg *datamsg;
1796 bool wait_connect = false;
1797 struct sctp_chunk *chunk;
1801 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1806 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1807 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1812 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1817 if (asoc->pmtu_pending) {
1818 if (sp->param_flags & SPP_PMTUD_ENABLE)
1819 sctp_assoc_sync_pmtu(asoc);
1820 asoc->pmtu_pending = 0;
1823 if (sctp_wspace(asoc) < (int)msg_len)
1824 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1826 if (sk_under_memory_pressure(sk))
1829 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1830 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1831 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1836 if (sctp_state(asoc, CLOSED)) {
1837 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1841 if (asoc->ep->intl_enable) {
1842 timeo = sock_sndtimeo(sk, 0);
1843 err = sctp_wait_for_connect(asoc, &timeo);
1849 wait_connect = true;
1852 pr_debug("%s: we associated primitively\n", __func__);
1855 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1856 if (IS_ERR(datamsg)) {
1857 err = PTR_ERR(datamsg);
1861 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1863 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1864 sctp_chunk_hold(chunk);
1865 sctp_set_owner_w(chunk);
1866 chunk->transport = transport;
1869 err = sctp_primitive_SEND(net, asoc, datamsg);
1871 sctp_datamsg_free(datamsg);
1875 pr_debug("%s: we sent primitively\n", __func__);
1877 sctp_datamsg_put(datamsg);
1879 if (unlikely(wait_connect)) {
1880 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1881 sctp_wait_for_connect(asoc, &timeo);
1890 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1891 const struct msghdr *msg,
1892 struct sctp_cmsgs *cmsgs)
1894 union sctp_addr *daddr = NULL;
1897 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1898 int len = msg->msg_namelen;
1900 if (len > sizeof(*daddr))
1901 len = sizeof(*daddr);
1903 daddr = (union sctp_addr *)msg->msg_name;
1905 err = sctp_verify_addr(sk, daddr, len);
1907 return ERR_PTR(err);
1913 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1914 struct sctp_sndrcvinfo *sinfo,
1915 struct sctp_cmsgs *cmsgs)
1917 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1918 sinfo->sinfo_stream = asoc->default_stream;
1919 sinfo->sinfo_ppid = asoc->default_ppid;
1920 sinfo->sinfo_context = asoc->default_context;
1921 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1924 sinfo->sinfo_flags = asoc->default_flags;
1927 if (!cmsgs->srinfo && !cmsgs->prinfo)
1928 sinfo->sinfo_timetolive = asoc->default_timetolive;
1930 if (cmsgs->authinfo) {
1931 /* Reuse sinfo_tsn to indicate that authinfo was set and
1932 * sinfo_ssn to save the keyid on tx path.
1934 sinfo->sinfo_tsn = 1;
1935 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1939 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1941 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1942 struct sctp_transport *transport = NULL;
1943 struct sctp_sndrcvinfo _sinfo, *sinfo;
1944 struct sctp_association *asoc, *tmp;
1945 struct sctp_cmsgs cmsgs;
1946 union sctp_addr *daddr;
1951 /* Parse and get snd_info */
1952 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1957 sflags = sinfo->sinfo_flags;
1959 /* Get daddr from msg */
1960 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1961 if (IS_ERR(daddr)) {
1962 err = PTR_ERR(daddr);
1968 /* SCTP_SENDALL process */
1969 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1970 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1971 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1978 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1980 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1985 iov_iter_revert(&msg->msg_iter, err);
1991 /* Get and check or create asoc */
1993 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1995 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2000 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2005 asoc = transport->asoc;
2009 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2012 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2018 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2023 /* Update snd_info with the asoc */
2024 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2026 /* Send msg to the asoc */
2027 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2028 if (err < 0 && err != -ESRCH && new)
2029 sctp_association_free(asoc);
2034 return sctp_error(sk, msg->msg_flags, err);
2037 /* This is an extended version of skb_pull() that removes the data from the
2038 * start of a skb even when data is spread across the list of skb's in the
2039 * frag_list. len specifies the total amount of data that needs to be removed.
2040 * when 'len' bytes could be removed from the skb, it returns 0.
2041 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2042 * could not be removed.
2044 static int sctp_skb_pull(struct sk_buff *skb, int len)
2046 struct sk_buff *list;
2047 int skb_len = skb_headlen(skb);
2050 if (len <= skb_len) {
2051 __skb_pull(skb, len);
2055 __skb_pull(skb, skb_len);
2057 skb_walk_frags(skb, list) {
2058 rlen = sctp_skb_pull(list, len);
2059 skb->len -= (len-rlen);
2060 skb->data_len -= (len-rlen);
2071 /* API 3.1.3 recvmsg() - UDP Style Syntax
2073 * ssize_t recvmsg(int socket, struct msghdr *message,
2076 * socket - the socket descriptor of the endpoint.
2077 * message - pointer to the msghdr structure which contains a single
2078 * user message and possibly some ancillary data.
2080 * See Section 5 for complete description of the data
2083 * flags - flags sent or received with the user message, see Section
2084 * 5 for complete description of the flags.
2086 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2087 int noblock, int flags, int *addr_len)
2089 struct sctp_ulpevent *event = NULL;
2090 struct sctp_sock *sp = sctp_sk(sk);
2091 struct sk_buff *skb, *head_skb;
2096 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2097 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2102 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2103 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2108 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2112 /* Get the total length of the skb including any skb's in the
2121 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2123 event = sctp_skb2event(skb);
2128 if (event->chunk && event->chunk->head_skb)
2129 head_skb = event->chunk->head_skb;
2132 sock_recv_ts_and_drops(msg, sk, head_skb);
2133 if (sctp_ulpevent_is_notification(event)) {
2134 msg->msg_flags |= MSG_NOTIFICATION;
2135 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2137 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2140 /* Check if we allow SCTP_NXTINFO. */
2141 if (sp->recvnxtinfo)
2142 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2143 /* Check if we allow SCTP_RCVINFO. */
2144 if (sp->recvrcvinfo)
2145 sctp_ulpevent_read_rcvinfo(event, msg);
2146 /* Check if we allow SCTP_SNDRCVINFO. */
2147 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2148 sctp_ulpevent_read_sndrcvinfo(event, msg);
2152 /* If skb's length exceeds the user's buffer, update the skb and
2153 * push it back to the receive_queue so that the next call to
2154 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2156 if (skb_len > copied) {
2157 msg->msg_flags &= ~MSG_EOR;
2158 if (flags & MSG_PEEK)
2160 sctp_skb_pull(skb, copied);
2161 skb_queue_head(&sk->sk_receive_queue, skb);
2163 /* When only partial message is copied to the user, increase
2164 * rwnd by that amount. If all the data in the skb is read,
2165 * rwnd is updated when the event is freed.
2167 if (!sctp_ulpevent_is_notification(event))
2168 sctp_assoc_rwnd_increase(event->asoc, copied);
2170 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2171 (event->msg_flags & MSG_EOR))
2172 msg->msg_flags |= MSG_EOR;
2174 msg->msg_flags &= ~MSG_EOR;
2177 if (flags & MSG_PEEK) {
2178 /* Release the skb reference acquired after peeking the skb in
2179 * sctp_skb_recv_datagram().
2183 /* Free the event which includes releasing the reference to
2184 * the owner of the skb, freeing the skb and updating the
2187 sctp_ulpevent_free(event);
2194 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2196 * This option is a on/off flag. If enabled no SCTP message
2197 * fragmentation will be performed. Instead if a message being sent
2198 * exceeds the current PMTU size, the message will NOT be sent and
2199 * instead a error will be indicated to the user.
2201 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2202 unsigned int optlen)
2204 if (optlen < sizeof(int))
2206 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2210 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2211 unsigned int optlen)
2213 struct sctp_sock *sp = sctp_sk(sk);
2214 struct sctp_association *asoc;
2217 if (optlen > sizeof(struct sctp_event_subscribe))
2220 for (i = 0; i < optlen; i++)
2221 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2224 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2225 asoc->subscribe = sctp_sk(sk)->subscribe;
2227 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2228 * if there is no data to be sent or retransmit, the stack will
2229 * immediately send up this notification.
2231 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2232 struct sctp_ulpevent *event;
2234 asoc = sctp_id2assoc(sk, 0);
2235 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2236 event = sctp_ulpevent_make_sender_dry_event(asoc,
2237 GFP_USER | __GFP_NOWARN);
2241 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2248 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2250 * This socket option is applicable to the UDP-style socket only. When
2251 * set it will cause associations that are idle for more than the
2252 * specified number of seconds to automatically close. An association
2253 * being idle is defined an association that has NOT sent or received
2254 * user data. The special value of '0' indicates that no automatic
2255 * close of any associations should be performed. The option expects an
2256 * integer defining the number of seconds of idle time before an
2257 * association is closed.
2259 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2260 unsigned int optlen)
2262 struct sctp_sock *sp = sctp_sk(sk);
2263 struct net *net = sock_net(sk);
2265 /* Applicable to UDP-style socket only */
2266 if (sctp_style(sk, TCP))
2268 if (optlen != sizeof(int))
2271 sp->autoclose = *optval;
2272 if (sp->autoclose > net->sctp.max_autoclose)
2273 sp->autoclose = net->sctp.max_autoclose;
2278 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2280 * Applications can enable or disable heartbeats for any peer address of
2281 * an association, modify an address's heartbeat interval, force a
2282 * heartbeat to be sent immediately, and adjust the address's maximum
2283 * number of retransmissions sent before an address is considered
2284 * unreachable. The following structure is used to access and modify an
2285 * address's parameters:
2287 * struct sctp_paddrparams {
2288 * sctp_assoc_t spp_assoc_id;
2289 * struct sockaddr_storage spp_address;
2290 * uint32_t spp_hbinterval;
2291 * uint16_t spp_pathmaxrxt;
2292 * uint32_t spp_pathmtu;
2293 * uint32_t spp_sackdelay;
2294 * uint32_t spp_flags;
2295 * uint32_t spp_ipv6_flowlabel;
2299 * spp_assoc_id - (one-to-many style socket) This is filled in the
2300 * application, and identifies the association for
2302 * spp_address - This specifies which address is of interest.
2303 * spp_hbinterval - This contains the value of the heartbeat interval,
2304 * in milliseconds. If a value of zero
2305 * is present in this field then no changes are to
2306 * be made to this parameter.
2307 * spp_pathmaxrxt - This contains the maximum number of
2308 * retransmissions before this address shall be
2309 * considered unreachable. If a value of zero
2310 * is present in this field then no changes are to
2311 * be made to this parameter.
2312 * spp_pathmtu - When Path MTU discovery is disabled the value
2313 * specified here will be the "fixed" path mtu.
2314 * Note that if the spp_address field is empty
2315 * then all associations on this address will
2316 * have this fixed path mtu set upon them.
2318 * spp_sackdelay - When delayed sack is enabled, this value specifies
2319 * the number of milliseconds that sacks will be delayed
2320 * for. This value will apply to all addresses of an
2321 * association if the spp_address field is empty. Note
2322 * also, that if delayed sack is enabled and this
2323 * value is set to 0, no change is made to the last
2324 * recorded delayed sack timer value.
2326 * spp_flags - These flags are used to control various features
2327 * on an association. The flag field may contain
2328 * zero or more of the following options.
2330 * SPP_HB_ENABLE - Enable heartbeats on the
2331 * specified address. Note that if the address
2332 * field is empty all addresses for the association
2333 * have heartbeats enabled upon them.
2335 * SPP_HB_DISABLE - Disable heartbeats on the
2336 * speicifed address. Note that if the address
2337 * field is empty all addresses for the association
2338 * will have their heartbeats disabled. Note also
2339 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2340 * mutually exclusive, only one of these two should
2341 * be specified. Enabling both fields will have
2342 * undetermined results.
2344 * SPP_HB_DEMAND - Request a user initiated heartbeat
2345 * to be made immediately.
2347 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2348 * heartbeat delayis to be set to the value of 0
2351 * SPP_PMTUD_ENABLE - This field will enable PMTU
2352 * discovery upon the specified address. Note that
2353 * if the address feild is empty then all addresses
2354 * on the association are effected.
2356 * SPP_PMTUD_DISABLE - This field will disable PMTU
2357 * discovery upon the specified address. Note that
2358 * if the address feild is empty then all addresses
2359 * on the association are effected. Not also that
2360 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2361 * exclusive. Enabling both will have undetermined
2364 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2365 * on delayed sack. The time specified in spp_sackdelay
2366 * is used to specify the sack delay for this address. Note
2367 * that if spp_address is empty then all addresses will
2368 * enable delayed sack and take on the sack delay
2369 * value specified in spp_sackdelay.
2370 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2371 * off delayed sack. If the spp_address field is blank then
2372 * delayed sack is disabled for the entire association. Note
2373 * also that this field is mutually exclusive to
2374 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2377 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2378 * setting of the IPV6 flow label value. The value is
2379 * contained in the spp_ipv6_flowlabel field.
2380 * Upon retrieval, this flag will be set to indicate that
2381 * the spp_ipv6_flowlabel field has a valid value returned.
2382 * If a specific destination address is set (in the
2383 * spp_address field), then the value returned is that of
2384 * the address. If just an association is specified (and
2385 * no address), then the association's default flow label
2386 * is returned. If neither an association nor a destination
2387 * is specified, then the socket's default flow label is
2388 * returned. For non-IPv6 sockets, this flag will be left
2391 * SPP_DSCP: Setting this flag enables the setting of the
2392 * Differentiated Services Code Point (DSCP) value
2393 * associated with either the association or a specific
2394 * address. The value is obtained in the spp_dscp field.
2395 * Upon retrieval, this flag will be set to indicate that
2396 * the spp_dscp field has a valid value returned. If a
2397 * specific destination address is set when called (in the
2398 * spp_address field), then that specific destination
2399 * address's DSCP value is returned. If just an association
2400 * is specified, then the association's default DSCP is
2401 * returned. If neither an association nor a destination is
2402 * specified, then the socket's default DSCP is returned.
2404 * spp_ipv6_flowlabel
2405 * - This field is used in conjunction with the
2406 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2407 * The 20 least significant bits are used for the flow
2408 * label. This setting has precedence over any IPv6-layer
2411 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2412 * and contains the DSCP. The 6 most significant bits are
2413 * used for the DSCP. This setting has precedence over any
2414 * IPv4- or IPv6- layer setting.
2416 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2417 struct sctp_transport *trans,
2418 struct sctp_association *asoc,
2419 struct sctp_sock *sp,
2422 int sackdelay_change)
2426 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2427 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2428 trans->asoc, trans);
2433 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2434 * this field is ignored. Note also that a value of zero indicates
2435 * the current setting should be left unchanged.
2437 if (params->spp_flags & SPP_HB_ENABLE) {
2439 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2440 * set. This lets us use 0 value when this flag
2443 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2444 params->spp_hbinterval = 0;
2446 if (params->spp_hbinterval ||
2447 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2450 msecs_to_jiffies(params->spp_hbinterval);
2453 msecs_to_jiffies(params->spp_hbinterval);
2455 sp->hbinterval = params->spp_hbinterval;
2462 trans->param_flags =
2463 (trans->param_flags & ~SPP_HB) | hb_change;
2466 (asoc->param_flags & ~SPP_HB) | hb_change;
2469 (sp->param_flags & ~SPP_HB) | hb_change;
2473 /* When Path MTU discovery is disabled the value specified here will
2474 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2475 * include the flag SPP_PMTUD_DISABLE for this field to have any
2478 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2480 trans->pathmtu = params->spp_pathmtu;
2481 sctp_assoc_sync_pmtu(asoc);
2483 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2485 sp->pathmtu = params->spp_pathmtu;
2491 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2492 (params->spp_flags & SPP_PMTUD_ENABLE);
2493 trans->param_flags =
2494 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2496 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2497 sctp_assoc_sync_pmtu(asoc);
2501 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2504 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2508 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2509 * value of this field is ignored. Note also that a value of zero
2510 * indicates the current setting should be left unchanged.
2512 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2515 msecs_to_jiffies(params->spp_sackdelay);
2518 msecs_to_jiffies(params->spp_sackdelay);
2520 sp->sackdelay = params->spp_sackdelay;
2524 if (sackdelay_change) {
2526 trans->param_flags =
2527 (trans->param_flags & ~SPP_SACKDELAY) |
2531 (asoc->param_flags & ~SPP_SACKDELAY) |
2535 (sp->param_flags & ~SPP_SACKDELAY) |
2540 /* Note that a value of zero indicates the current setting should be
2543 if (params->spp_pathmaxrxt) {
2545 trans->pathmaxrxt = params->spp_pathmaxrxt;
2547 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2549 sp->pathmaxrxt = params->spp_pathmaxrxt;
2553 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2555 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2556 trans->flowlabel = params->spp_ipv6_flowlabel &
2557 SCTP_FLOWLABEL_VAL_MASK;
2558 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2561 struct sctp_transport *t;
2563 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2565 if (t->ipaddr.sa.sa_family != AF_INET6)
2567 t->flowlabel = params->spp_ipv6_flowlabel &
2568 SCTP_FLOWLABEL_VAL_MASK;
2569 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571 asoc->flowlabel = params->spp_ipv6_flowlabel &
2572 SCTP_FLOWLABEL_VAL_MASK;
2573 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2574 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2575 sp->flowlabel = params->spp_ipv6_flowlabel &
2576 SCTP_FLOWLABEL_VAL_MASK;
2577 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2581 if (params->spp_flags & SPP_DSCP) {
2583 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2584 trans->dscp |= SCTP_DSCP_SET_MASK;
2586 struct sctp_transport *t;
2588 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2590 t->dscp = params->spp_dscp &
2592 t->dscp |= SCTP_DSCP_SET_MASK;
2594 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2595 asoc->dscp |= SCTP_DSCP_SET_MASK;
2597 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2598 sp->dscp |= SCTP_DSCP_SET_MASK;
2605 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2606 struct sctp_paddrparams *params,
2607 unsigned int optlen)
2609 struct sctp_transport *trans = NULL;
2610 struct sctp_association *asoc = NULL;
2611 struct sctp_sock *sp = sctp_sk(sk);
2613 int hb_change, pmtud_change, sackdelay_change;
2615 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2616 spp_ipv6_flowlabel), 4)) {
2617 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2619 } else if (optlen != sizeof(*params)) {
2623 /* Validate flags and value parameters. */
2624 hb_change = params->spp_flags & SPP_HB;
2625 pmtud_change = params->spp_flags & SPP_PMTUD;
2626 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2628 if (hb_change == SPP_HB ||
2629 pmtud_change == SPP_PMTUD ||
2630 sackdelay_change == SPP_SACKDELAY ||
2631 params->spp_sackdelay > 500 ||
2632 (params->spp_pathmtu &&
2633 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2636 /* If an address other than INADDR_ANY is specified, and
2637 * no transport is found, then the request is invalid.
2639 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2640 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2641 params->spp_assoc_id);
2646 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2647 * socket is a one to many style socket, and an association
2648 * was not found, then the id was invalid.
2650 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2651 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2652 sctp_style(sk, UDP))
2655 /* Heartbeat demand can only be sent on a transport or
2656 * association, but not a socket.
2658 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2661 /* Process parameters. */
2662 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2663 hb_change, pmtud_change,
2669 /* If changes are for association, also apply parameters to each
2672 if (!trans && asoc) {
2673 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2675 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2676 hb_change, pmtud_change,
2684 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2686 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2689 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2691 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2694 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2695 struct sctp_association *asoc)
2697 struct sctp_transport *trans;
2699 if (params->sack_delay) {
2700 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2702 sctp_spp_sackdelay_enable(asoc->param_flags);
2704 if (params->sack_freq == 1) {
2706 sctp_spp_sackdelay_disable(asoc->param_flags);
2707 } else if (params->sack_freq > 1) {
2708 asoc->sackfreq = params->sack_freq;
2710 sctp_spp_sackdelay_enable(asoc->param_flags);
2713 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2715 if (params->sack_delay) {
2716 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2717 trans->param_flags =
2718 sctp_spp_sackdelay_enable(trans->param_flags);
2720 if (params->sack_freq == 1) {
2721 trans->param_flags =
2722 sctp_spp_sackdelay_disable(trans->param_flags);
2723 } else if (params->sack_freq > 1) {
2724 trans->sackfreq = params->sack_freq;
2725 trans->param_flags =
2726 sctp_spp_sackdelay_enable(trans->param_flags);
2732 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2734 * This option will effect the way delayed acks are performed. This
2735 * option allows you to get or set the delayed ack time, in
2736 * milliseconds. It also allows changing the delayed ack frequency.
2737 * Changing the frequency to 1 disables the delayed sack algorithm. If
2738 * the assoc_id is 0, then this sets or gets the endpoints default
2739 * values. If the assoc_id field is non-zero, then the set or get
2740 * effects the specified association for the one to many model (the
2741 * assoc_id field is ignored by the one to one model). Note that if
2742 * sack_delay or sack_freq are 0 when setting this option, then the
2743 * current values will remain unchanged.
2745 * struct sctp_sack_info {
2746 * sctp_assoc_t sack_assoc_id;
2747 * uint32_t sack_delay;
2748 * uint32_t sack_freq;
2751 * sack_assoc_id - This parameter, indicates which association the user
2752 * is performing an action upon. Note that if this field's value is
2753 * zero then the endpoints default value is changed (effecting future
2754 * associations only).
2756 * sack_delay - This parameter contains the number of milliseconds that
2757 * the user is requesting the delayed ACK timer be set to. Note that
2758 * this value is defined in the standard to be between 200 and 500
2761 * sack_freq - This parameter contains the number of packets that must
2762 * be received before a sack is sent without waiting for the delay
2763 * timer to expire. The default value for this is 2, setting this
2764 * value to 1 will disable the delayed sack algorithm.
2766 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2767 struct sctp_sack_info *params)
2769 struct sctp_sock *sp = sctp_sk(sk);
2770 struct sctp_association *asoc;
2772 /* Validate value parameter. */
2773 if (params->sack_delay > 500)
2776 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2777 * socket is a one to many style socket, and an association
2778 * was not found, then the id was invalid.
2780 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2781 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2782 sctp_style(sk, UDP))
2786 sctp_apply_asoc_delayed_ack(params, asoc);
2791 if (sctp_style(sk, TCP))
2792 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2794 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2795 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2796 if (params->sack_delay) {
2797 sp->sackdelay = params->sack_delay;
2799 sctp_spp_sackdelay_enable(sp->param_flags);
2801 if (params->sack_freq == 1) {
2803 sctp_spp_sackdelay_disable(sp->param_flags);
2804 } else if (params->sack_freq > 1) {
2805 sp->sackfreq = params->sack_freq;
2807 sctp_spp_sackdelay_enable(sp->param_flags);
2811 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2812 params->sack_assoc_id == SCTP_ALL_ASSOC)
2813 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2814 sctp_apply_asoc_delayed_ack(params, asoc);
2819 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2820 struct sctp_sack_info *params,
2821 unsigned int optlen)
2823 if (optlen == sizeof(struct sctp_assoc_value)) {
2824 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2825 struct sctp_sack_info p;
2827 pr_warn_ratelimited(DEPRECATED
2829 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2830 "Use struct sctp_sack_info instead\n",
2831 current->comm, task_pid_nr(current));
2833 p.sack_assoc_id = v->assoc_id;
2834 p.sack_delay = v->assoc_value;
2835 p.sack_freq = v->assoc_value ? 0 : 1;
2836 return __sctp_setsockopt_delayed_ack(sk, &p);
2839 if (optlen != sizeof(struct sctp_sack_info))
2841 if (params->sack_delay == 0 && params->sack_freq == 0)
2843 return __sctp_setsockopt_delayed_ack(sk, params);
2846 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2848 * Applications can specify protocol parameters for the default association
2849 * initialization. The option name argument to setsockopt() and getsockopt()
2852 * Setting initialization parameters is effective only on an unconnected
2853 * socket (for UDP-style sockets only future associations are effected
2854 * by the change). With TCP-style sockets, this option is inherited by
2855 * sockets derived from a listener socket.
2857 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2858 unsigned int optlen)
2860 struct sctp_sock *sp = sctp_sk(sk);
2862 if (optlen != sizeof(struct sctp_initmsg))
2865 if (sinit->sinit_num_ostreams)
2866 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2867 if (sinit->sinit_max_instreams)
2868 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2869 if (sinit->sinit_max_attempts)
2870 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2871 if (sinit->sinit_max_init_timeo)
2872 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2878 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2880 * Applications that wish to use the sendto() system call may wish to
2881 * specify a default set of parameters that would normally be supplied
2882 * through the inclusion of ancillary data. This socket option allows
2883 * such an application to set the default sctp_sndrcvinfo structure.
2884 * The application that wishes to use this socket option simply passes
2885 * in to this call the sctp_sndrcvinfo structure defined in Section
2886 * 5.2.2) The input parameters accepted by this call include
2887 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2888 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2889 * to this call if the caller is using the UDP model.
2891 static int sctp_setsockopt_default_send_param(struct sock *sk,
2892 struct sctp_sndrcvinfo *info,
2893 unsigned int optlen)
2895 struct sctp_sock *sp = sctp_sk(sk);
2896 struct sctp_association *asoc;
2898 if (optlen != sizeof(*info))
2900 if (info->sinfo_flags &
2901 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2902 SCTP_ABORT | SCTP_EOF))
2905 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2906 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2907 sctp_style(sk, UDP))
2911 asoc->default_stream = info->sinfo_stream;
2912 asoc->default_flags = info->sinfo_flags;
2913 asoc->default_ppid = info->sinfo_ppid;
2914 asoc->default_context = info->sinfo_context;
2915 asoc->default_timetolive = info->sinfo_timetolive;
2920 if (sctp_style(sk, TCP))
2921 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2923 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2924 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2925 sp->default_stream = info->sinfo_stream;
2926 sp->default_flags = info->sinfo_flags;
2927 sp->default_ppid = info->sinfo_ppid;
2928 sp->default_context = info->sinfo_context;
2929 sp->default_timetolive = info->sinfo_timetolive;
2932 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2933 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2934 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2935 asoc->default_stream = info->sinfo_stream;
2936 asoc->default_flags = info->sinfo_flags;
2937 asoc->default_ppid = info->sinfo_ppid;
2938 asoc->default_context = info->sinfo_context;
2939 asoc->default_timetolive = info->sinfo_timetolive;
2946 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2947 * (SCTP_DEFAULT_SNDINFO)
2949 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2950 struct sctp_sndinfo *info,
2951 unsigned int optlen)
2953 struct sctp_sock *sp = sctp_sk(sk);
2954 struct sctp_association *asoc;
2956 if (optlen != sizeof(*info))
2958 if (info->snd_flags &
2959 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2960 SCTP_ABORT | SCTP_EOF))
2963 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2964 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2965 sctp_style(sk, UDP))
2969 asoc->default_stream = info->snd_sid;
2970 asoc->default_flags = info->snd_flags;
2971 asoc->default_ppid = info->snd_ppid;
2972 asoc->default_context = info->snd_context;
2977 if (sctp_style(sk, TCP))
2978 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2980 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2981 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2982 sp->default_stream = info->snd_sid;
2983 sp->default_flags = info->snd_flags;
2984 sp->default_ppid = info->snd_ppid;
2985 sp->default_context = info->snd_context;
2988 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2989 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2990 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2991 asoc->default_stream = info->snd_sid;
2992 asoc->default_flags = info->snd_flags;
2993 asoc->default_ppid = info->snd_ppid;
2994 asoc->default_context = info->snd_context;
3001 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3003 * Requests that the local SCTP stack use the enclosed peer address as
3004 * the association primary. The enclosed address must be one of the
3005 * association peer's addresses.
3007 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3008 unsigned int optlen)
3010 struct sctp_transport *trans;
3014 if (optlen != sizeof(struct sctp_prim))
3017 /* Allow security module to validate address but need address len. */
3018 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3022 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3023 (struct sockaddr *)&prim->ssp_addr,
3028 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3032 sctp_assoc_set_primary(trans->asoc, trans);
3038 * 7.1.5 SCTP_NODELAY
3040 * Turn on/off any Nagle-like algorithm. This means that packets are
3041 * generally sent as soon as possible and no unnecessary delays are
3042 * introduced, at the cost of more packets in the network. Expects an
3043 * integer boolean flag.
3045 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3046 unsigned int optlen)
3048 if (optlen < sizeof(int))
3050 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3056 * 7.1.1 SCTP_RTOINFO
3058 * The protocol parameters used to initialize and bound retransmission
3059 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3060 * and modify these parameters.
3061 * All parameters are time values, in milliseconds. A value of 0, when
3062 * modifying the parameters, indicates that the current value should not
3066 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3067 struct sctp_rtoinfo *rtoinfo,
3068 unsigned int optlen)
3070 struct sctp_association *asoc;
3071 unsigned long rto_min, rto_max;
3072 struct sctp_sock *sp = sctp_sk(sk);
3074 if (optlen != sizeof (struct sctp_rtoinfo))
3077 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3079 /* Set the values to the specific association */
3080 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3081 sctp_style(sk, UDP))
3084 rto_max = rtoinfo->srto_max;
3085 rto_min = rtoinfo->srto_min;
3088 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3090 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3093 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3095 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3097 if (rto_min > rto_max)
3101 if (rtoinfo->srto_initial != 0)
3103 msecs_to_jiffies(rtoinfo->srto_initial);
3104 asoc->rto_max = rto_max;
3105 asoc->rto_min = rto_min;
3107 /* If there is no association or the association-id = 0
3108 * set the values to the endpoint.
3110 if (rtoinfo->srto_initial != 0)
3111 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3112 sp->rtoinfo.srto_max = rto_max;
3113 sp->rtoinfo.srto_min = rto_min;
3121 * 7.1.2 SCTP_ASSOCINFO
3123 * This option is used to tune the maximum retransmission attempts
3124 * of the association.
3125 * Returns an error if the new association retransmission value is
3126 * greater than the sum of the retransmission value of the peer.
3127 * See [SCTP] for more information.
3130 static int sctp_setsockopt_associnfo(struct sock *sk,
3131 struct sctp_assocparams *assocparams,
3132 unsigned int optlen)
3135 struct sctp_association *asoc;
3137 if (optlen != sizeof(struct sctp_assocparams))
3140 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3142 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3143 sctp_style(sk, UDP))
3146 /* Set the values to the specific association */
3148 if (assocparams->sasoc_asocmaxrxt != 0) {
3151 struct sctp_transport *peer_addr;
3153 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3155 path_sum += peer_addr->pathmaxrxt;
3159 /* Only validate asocmaxrxt if we have more than
3160 * one path/transport. We do this because path
3161 * retransmissions are only counted when we have more
3165 assocparams->sasoc_asocmaxrxt > path_sum)
3168 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3171 if (assocparams->sasoc_cookie_life != 0)
3173 ms_to_ktime(assocparams->sasoc_cookie_life);
3175 /* Set the values to the endpoint */
3176 struct sctp_sock *sp = sctp_sk(sk);
3178 if (assocparams->sasoc_asocmaxrxt != 0)
3179 sp->assocparams.sasoc_asocmaxrxt =
3180 assocparams->sasoc_asocmaxrxt;
3181 if (assocparams->sasoc_cookie_life != 0)
3182 sp->assocparams.sasoc_cookie_life =
3183 assocparams->sasoc_cookie_life;
3189 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3191 * This socket option is a boolean flag which turns on or off mapped V4
3192 * addresses. If this option is turned on and the socket is type
3193 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3194 * If this option is turned off, then no mapping will be done of V4
3195 * addresses and a user will receive both PF_INET6 and PF_INET type
3196 * addresses on the socket.
3198 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3199 unsigned int optlen)
3201 struct sctp_sock *sp = sctp_sk(sk);
3203 if (optlen < sizeof(int))
3214 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3215 * This option will get or set the maximum size to put in any outgoing
3216 * SCTP DATA chunk. If a message is larger than this size it will be
3217 * fragmented by SCTP into the specified size. Note that the underlying
3218 * SCTP implementation may fragment into smaller sized chunks when the
3219 * PMTU of the underlying association is smaller than the value set by
3220 * the user. The default value for this option is '0' which indicates
3221 * the user is NOT limiting fragmentation and only the PMTU will effect
3222 * SCTP's choice of DATA chunk size. Note also that values set larger
3223 * than the maximum size of an IP datagram will effectively let SCTP
3224 * control fragmentation (i.e. the same as setting this option to 0).
3226 * The following structure is used to access and modify this parameter:
3228 * struct sctp_assoc_value {
3229 * sctp_assoc_t assoc_id;
3230 * uint32_t assoc_value;
3233 * assoc_id: This parameter is ignored for one-to-one style sockets.
3234 * For one-to-many style sockets this parameter indicates which
3235 * association the user is performing an action upon. Note that if
3236 * this field's value is zero then the endpoints default value is
3237 * changed (effecting future associations only).
3238 * assoc_value: This parameter specifies the maximum size in bytes.
3240 static int sctp_setsockopt_maxseg(struct sock *sk,
3241 struct sctp_assoc_value *params,
3242 unsigned int optlen)
3244 struct sctp_sock *sp = sctp_sk(sk);
3245 struct sctp_association *asoc;
3246 sctp_assoc_t assoc_id;
3249 if (optlen == sizeof(int)) {
3250 pr_warn_ratelimited(DEPRECATED
3252 "Use of int in maxseg socket option.\n"
3253 "Use struct sctp_assoc_value instead\n",
3254 current->comm, task_pid_nr(current));
3255 assoc_id = SCTP_FUTURE_ASSOC;
3256 val = *(int *)params;
3257 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3258 assoc_id = params->assoc_id;
3259 val = params->assoc_value;
3264 asoc = sctp_id2assoc(sk, assoc_id);
3265 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3266 sctp_style(sk, UDP))
3270 int min_len, max_len;
3271 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3272 sizeof(struct sctp_data_chunk);
3274 min_len = sctp_min_frag_point(sp, datasize);
3275 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3277 if (val < min_len || val > max_len)
3282 asoc->user_frag = val;
3283 sctp_assoc_update_frag_point(asoc);
3285 sp->user_frag = val;
3293 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3295 * Requests that the peer mark the enclosed address as the association
3296 * primary. The enclosed address must be one of the association's
3297 * locally bound addresses. The following structure is used to make a
3298 * set primary request:
3300 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3301 struct sctp_setpeerprim *prim,
3302 unsigned int optlen)
3304 struct sctp_sock *sp;
3305 struct sctp_association *asoc = NULL;
3306 struct sctp_chunk *chunk;
3312 if (!sp->ep->asconf_enable)
3315 if (optlen != sizeof(struct sctp_setpeerprim))
3318 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3322 if (!asoc->peer.asconf_capable)
3325 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3328 if (!sctp_state(asoc, ESTABLISHED))
3331 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3335 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3336 return -EADDRNOTAVAIL;
3338 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3339 return -EADDRNOTAVAIL;
3341 /* Allow security module to validate address. */
3342 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3343 (struct sockaddr *)&prim->sspp_addr,
3348 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3349 chunk = sctp_make_asconf_set_prim(asoc,
3350 (union sctp_addr *)&prim->sspp_addr);
3354 err = sctp_send_asconf(asoc, chunk);
3356 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3361 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3362 struct sctp_setadaptation *adapt,
3363 unsigned int optlen)
3365 if (optlen != sizeof(struct sctp_setadaptation))
3368 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3374 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3376 * The context field in the sctp_sndrcvinfo structure is normally only
3377 * used when a failed message is retrieved holding the value that was
3378 * sent down on the actual send call. This option allows the setting of
3379 * a default context on an association basis that will be received on
3380 * reading messages from the peer. This is especially helpful in the
3381 * one-2-many model for an application to keep some reference to an
3382 * internal state machine that is processing messages on the
3383 * association. Note that the setting of this value only effects
3384 * received messages from the peer and does not effect the value that is
3385 * saved with outbound messages.
3387 static int sctp_setsockopt_context(struct sock *sk,
3388 struct sctp_assoc_value *params,
3389 unsigned int optlen)
3391 struct sctp_sock *sp = sctp_sk(sk);
3392 struct sctp_association *asoc;
3394 if (optlen != sizeof(struct sctp_assoc_value))
3397 asoc = sctp_id2assoc(sk, params->assoc_id);
3398 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3399 sctp_style(sk, UDP))
3403 asoc->default_rcv_context = params->assoc_value;
3408 if (sctp_style(sk, TCP))
3409 params->assoc_id = SCTP_FUTURE_ASSOC;
3411 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3412 params->assoc_id == SCTP_ALL_ASSOC)
3413 sp->default_rcv_context = params->assoc_value;
3415 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3416 params->assoc_id == SCTP_ALL_ASSOC)
3417 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3418 asoc->default_rcv_context = params->assoc_value;
3424 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3426 * This options will at a minimum specify if the implementation is doing
3427 * fragmented interleave. Fragmented interleave, for a one to many
3428 * socket, is when subsequent calls to receive a message may return
3429 * parts of messages from different associations. Some implementations
3430 * may allow you to turn this value on or off. If so, when turned off,
3431 * no fragment interleave will occur (which will cause a head of line
3432 * blocking amongst multiple associations sharing the same one to many
3433 * socket). When this option is turned on, then each receive call may
3434 * come from a different association (thus the user must receive data
3435 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3436 * association each receive belongs to.
3438 * This option takes a boolean value. A non-zero value indicates that
3439 * fragmented interleave is on. A value of zero indicates that
3440 * fragmented interleave is off.
3442 * Note that it is important that an implementation that allows this
3443 * option to be turned on, have it off by default. Otherwise an unaware
3444 * application using the one to many model may become confused and act
3447 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3448 unsigned int optlen)
3450 if (optlen != sizeof(int))
3453 sctp_sk(sk)->frag_interleave = !!*val;
3455 if (!sctp_sk(sk)->frag_interleave)
3456 sctp_sk(sk)->ep->intl_enable = 0;
3462 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3463 * (SCTP_PARTIAL_DELIVERY_POINT)
3465 * This option will set or get the SCTP partial delivery point. This
3466 * point is the size of a message where the partial delivery API will be
3467 * invoked to help free up rwnd space for the peer. Setting this to a
3468 * lower value will cause partial deliveries to happen more often. The
3469 * calls argument is an integer that sets or gets the partial delivery
3470 * point. Note also that the call will fail if the user attempts to set
3471 * this value larger than the socket receive buffer size.
3473 * Note that any single message having a length smaller than or equal to
3474 * the SCTP partial delivery point will be delivered in one single read
3475 * call as long as the user provided buffer is large enough to hold the
3478 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3479 unsigned int optlen)
3481 if (optlen != sizeof(u32))
3484 /* Note: We double the receive buffer from what the user sets
3485 * it to be, also initial rwnd is based on rcvbuf/2.
3487 if (*val > (sk->sk_rcvbuf >> 1))
3490 sctp_sk(sk)->pd_point = *val;
3492 return 0; /* is this the right error code? */
3496 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3498 * This option will allow a user to change the maximum burst of packets
3499 * that can be emitted by this association. Note that the default value
3500 * is 4, and some implementations may restrict this setting so that it
3501 * can only be lowered.
3503 * NOTE: This text doesn't seem right. Do this on a socket basis with
3504 * future associations inheriting the socket value.
3506 static int sctp_setsockopt_maxburst(struct sock *sk,
3507 struct sctp_assoc_value *params,
3508 unsigned int optlen)
3510 struct sctp_sock *sp = sctp_sk(sk);
3511 struct sctp_association *asoc;
3512 sctp_assoc_t assoc_id;
3515 if (optlen == sizeof(int)) {
3516 pr_warn_ratelimited(DEPRECATED
3518 "Use of int in max_burst socket option deprecated.\n"
3519 "Use struct sctp_assoc_value instead\n",
3520 current->comm, task_pid_nr(current));
3521 assoc_id = SCTP_FUTURE_ASSOC;
3522 assoc_value = *((int *)params);
3523 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3524 assoc_id = params->assoc_id;
3525 assoc_value = params->assoc_value;
3529 asoc = sctp_id2assoc(sk, assoc_id);
3530 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3534 asoc->max_burst = assoc_value;
3539 if (sctp_style(sk, TCP))
3540 assoc_id = SCTP_FUTURE_ASSOC;
3542 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3543 sp->max_burst = assoc_value;
3545 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3546 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3547 asoc->max_burst = assoc_value;
3553 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3555 * This set option adds a chunk type that the user is requesting to be
3556 * received only in an authenticated way. Changes to the list of chunks
3557 * will only effect future associations on the socket.
3559 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3560 struct sctp_authchunk *val,
3561 unsigned int optlen)
3563 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3565 if (!ep->auth_enable)
3568 if (optlen != sizeof(struct sctp_authchunk))
3571 switch (val->sauth_chunk) {
3573 case SCTP_CID_INIT_ACK:
3574 case SCTP_CID_SHUTDOWN_COMPLETE:
3579 /* add this chunk id to the endpoint */
3580 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3584 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3586 * This option gets or sets the list of HMAC algorithms that the local
3587 * endpoint requires the peer to use.
3589 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3590 struct sctp_hmacalgo *hmacs,
3591 unsigned int optlen)
3593 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3596 if (!ep->auth_enable)
3599 if (optlen < sizeof(struct sctp_hmacalgo))
3601 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3602 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3604 idents = hmacs->shmac_num_idents;
3605 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3606 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3609 return sctp_auth_ep_set_hmacs(ep, hmacs);
3613 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3615 * This option will set a shared secret key which is used to build an
3616 * association shared key.
3618 static int sctp_setsockopt_auth_key(struct sock *sk,
3619 struct sctp_authkey *authkey,
3620 unsigned int optlen)
3622 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3623 struct sctp_association *asoc;
3626 if (optlen <= sizeof(struct sctp_authkey))
3628 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3631 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3633 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3636 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3637 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3638 sctp_style(sk, UDP))
3642 ret = sctp_auth_set_key(ep, asoc, authkey);
3646 if (sctp_style(sk, TCP))
3647 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3649 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3650 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3651 ret = sctp_auth_set_key(ep, asoc, authkey);
3658 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3659 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3660 list_for_each_entry(asoc, &ep->asocs, asocs) {
3661 int res = sctp_auth_set_key(ep, asoc, authkey);
3669 memzero_explicit(authkey, optlen);
3674 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3676 * This option will get or set the active shared key to be used to build
3677 * the association shared key.
3679 static int sctp_setsockopt_active_key(struct sock *sk,
3680 struct sctp_authkeyid *val,
3681 unsigned int optlen)
3683 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3684 struct sctp_association *asoc;
3687 if (optlen != sizeof(struct sctp_authkeyid))
3690 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3691 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3692 sctp_style(sk, UDP))
3696 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3698 if (sctp_style(sk, TCP))
3699 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3701 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3702 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3703 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3708 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3709 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3710 list_for_each_entry(asoc, &ep->asocs, asocs) {
3711 int res = sctp_auth_set_active_key(ep, asoc,
3712 val->scact_keynumber);
3723 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3725 * This set option will delete a shared secret key from use.
3727 static int sctp_setsockopt_del_key(struct sock *sk,
3728 struct sctp_authkeyid *val,
3729 unsigned int optlen)
3731 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3732 struct sctp_association *asoc;
3735 if (optlen != sizeof(struct sctp_authkeyid))
3738 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3739 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3740 sctp_style(sk, UDP))
3744 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3746 if (sctp_style(sk, TCP))
3747 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3749 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3750 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3751 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3756 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3757 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3758 list_for_each_entry(asoc, &ep->asocs, asocs) {
3759 int res = sctp_auth_del_key_id(ep, asoc,
3760 val->scact_keynumber);
3771 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3773 * This set option will deactivate a shared secret key.
3775 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3776 struct sctp_authkeyid *val,
3777 unsigned int optlen)
3779 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3780 struct sctp_association *asoc;
3783 if (optlen != sizeof(struct sctp_authkeyid))
3786 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3787 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3788 sctp_style(sk, UDP))
3792 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3794 if (sctp_style(sk, TCP))
3795 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3797 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3798 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3799 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3804 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3805 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3806 list_for_each_entry(asoc, &ep->asocs, asocs) {
3807 int res = sctp_auth_deact_key_id(ep, asoc,
3808 val->scact_keynumber);
3819 * 8.1.23 SCTP_AUTO_ASCONF
3821 * This option will enable or disable the use of the automatic generation of
3822 * ASCONF chunks to add and delete addresses to an existing association. Note
3823 * that this option has two caveats namely: a) it only affects sockets that
3824 * are bound to all addresses available to the SCTP stack, and b) the system
3825 * administrator may have an overriding control that turns the ASCONF feature
3826 * off no matter what setting the socket option may have.
3827 * This option expects an integer boolean flag, where a non-zero value turns on
3828 * the option, and a zero value turns off the option.
3829 * Note. In this implementation, socket operation overrides default parameter
3830 * being set by sysctl as well as FreeBSD implementation
3832 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3833 unsigned int optlen)
3835 struct sctp_sock *sp = sctp_sk(sk);
3837 if (optlen < sizeof(int))
3839 if (!sctp_is_ep_boundall(sk) && *val)
3841 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3844 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3845 if (*val == 0 && sp->do_auto_asconf) {
3846 list_del(&sp->auto_asconf_list);
3847 sp->do_auto_asconf = 0;
3848 } else if (*val && !sp->do_auto_asconf) {
3849 list_add_tail(&sp->auto_asconf_list,
3850 &sock_net(sk)->sctp.auto_asconf_splist);
3851 sp->do_auto_asconf = 1;
3853 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3858 * SCTP_PEER_ADDR_THLDS
3860 * This option allows us to alter the partially failed threshold for one or all
3861 * transports in an association. See Section 6.1 of:
3862 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3864 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3865 struct sctp_paddrthlds_v2 *val,
3866 unsigned int optlen, bool v2)
3868 struct sctp_transport *trans;
3869 struct sctp_association *asoc;
3872 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3876 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3879 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3880 trans = sctp_addr_id2transport(sk, &val->spt_address,
3885 if (val->spt_pathmaxrxt)
3886 trans->pathmaxrxt = val->spt_pathmaxrxt;
3888 trans->ps_retrans = val->spt_pathcpthld;
3889 trans->pf_retrans = val->spt_pathpfthld;
3894 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3895 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3896 sctp_style(sk, UDP))
3900 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3902 if (val->spt_pathmaxrxt)
3903 trans->pathmaxrxt = val->spt_pathmaxrxt;
3905 trans->ps_retrans = val->spt_pathcpthld;
3906 trans->pf_retrans = val->spt_pathpfthld;
3909 if (val->spt_pathmaxrxt)
3910 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3912 asoc->ps_retrans = val->spt_pathcpthld;
3913 asoc->pf_retrans = val->spt_pathpfthld;
3915 struct sctp_sock *sp = sctp_sk(sk);
3917 if (val->spt_pathmaxrxt)
3918 sp->pathmaxrxt = val->spt_pathmaxrxt;
3920 sp->ps_retrans = val->spt_pathcpthld;
3921 sp->pf_retrans = val->spt_pathpfthld;
3927 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3928 unsigned int optlen)
3930 if (optlen < sizeof(int))
3933 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3938 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3939 unsigned int optlen)
3941 if (optlen < sizeof(int))
3944 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3949 static int sctp_setsockopt_pr_supported(struct sock *sk,
3950 struct sctp_assoc_value *params,
3951 unsigned int optlen)
3953 struct sctp_association *asoc;
3955 if (optlen != sizeof(*params))
3958 asoc = sctp_id2assoc(sk, params->assoc_id);
3959 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3960 sctp_style(sk, UDP))
3963 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3968 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3969 struct sctp_default_prinfo *info,
3970 unsigned int optlen)
3972 struct sctp_sock *sp = sctp_sk(sk);
3973 struct sctp_association *asoc;
3974 int retval = -EINVAL;
3976 if (optlen != sizeof(*info))
3979 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3982 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3985 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3986 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3987 sctp_style(sk, UDP))
3993 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3994 asoc->default_timetolive = info->pr_value;
3998 if (sctp_style(sk, TCP))
3999 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4001 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4002 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4003 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4004 sp->default_timetolive = info->pr_value;
4007 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4008 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4009 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4010 SCTP_PR_SET_POLICY(asoc->default_flags,
4012 asoc->default_timetolive = info->pr_value;
4020 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4021 struct sctp_assoc_value *params,
4022 unsigned int optlen)
4024 struct sctp_association *asoc;
4025 int retval = -EINVAL;
4027 if (optlen != sizeof(*params))
4030 asoc = sctp_id2assoc(sk, params->assoc_id);
4031 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4032 sctp_style(sk, UDP))
4035 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4043 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4044 struct sctp_assoc_value *params,
4045 unsigned int optlen)
4047 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4048 struct sctp_association *asoc;
4049 int retval = -EINVAL;
4051 if (optlen != sizeof(*params))
4054 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4057 asoc = sctp_id2assoc(sk, params->assoc_id);
4058 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4059 sctp_style(sk, UDP))
4065 asoc->strreset_enable = params->assoc_value;
4069 if (sctp_style(sk, TCP))
4070 params->assoc_id = SCTP_FUTURE_ASSOC;
4072 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4073 params->assoc_id == SCTP_ALL_ASSOC)
4074 ep->strreset_enable = params->assoc_value;
4076 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4077 params->assoc_id == SCTP_ALL_ASSOC)
4078 list_for_each_entry(asoc, &ep->asocs, asocs)
4079 asoc->strreset_enable = params->assoc_value;
4085 static int sctp_setsockopt_reset_streams(struct sock *sk,
4086 struct sctp_reset_streams *params,
4087 unsigned int optlen)
4089 struct sctp_association *asoc;
4091 if (optlen < sizeof(*params))
4093 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4094 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4095 sizeof(__u16) * sizeof(*params));
4097 if (params->srs_number_streams * sizeof(__u16) >
4098 optlen - sizeof(*params))
4101 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4105 return sctp_send_reset_streams(asoc, params);
4108 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4109 unsigned int optlen)
4111 struct sctp_association *asoc;
4113 if (optlen != sizeof(*associd))
4116 asoc = sctp_id2assoc(sk, *associd);
4120 return sctp_send_reset_assoc(asoc);
4123 static int sctp_setsockopt_add_streams(struct sock *sk,
4124 struct sctp_add_streams *params,
4125 unsigned int optlen)
4127 struct sctp_association *asoc;
4129 if (optlen != sizeof(*params))
4132 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4136 return sctp_send_add_streams(asoc, params);
4139 static int sctp_setsockopt_scheduler(struct sock *sk,
4140 struct sctp_assoc_value *params,
4141 unsigned int optlen)
4143 struct sctp_sock *sp = sctp_sk(sk);
4144 struct sctp_association *asoc;
4147 if (optlen < sizeof(*params))
4150 if (params->assoc_value > SCTP_SS_MAX)
4153 asoc = sctp_id2assoc(sk, params->assoc_id);
4154 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4155 sctp_style(sk, UDP))
4159 return sctp_sched_set_sched(asoc, params->assoc_value);
4161 if (sctp_style(sk, TCP))
4162 params->assoc_id = SCTP_FUTURE_ASSOC;
4164 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4165 params->assoc_id == SCTP_ALL_ASSOC)
4166 sp->default_ss = params->assoc_value;
4168 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4169 params->assoc_id == SCTP_ALL_ASSOC) {
4170 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4171 int ret = sctp_sched_set_sched(asoc,
4172 params->assoc_value);
4182 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4183 struct sctp_stream_value *params,
4184 unsigned int optlen)
4186 struct sctp_association *asoc;
4187 int retval = -EINVAL;
4189 if (optlen < sizeof(*params))
4192 asoc = sctp_id2assoc(sk, params->assoc_id);
4193 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4194 sctp_style(sk, UDP))
4198 retval = sctp_sched_set_value(asoc, params->stream_id,
4199 params->stream_value, GFP_KERNEL);
4205 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4206 int ret = sctp_sched_set_value(asoc, params->stream_id,
4207 params->stream_value,
4209 if (ret && !retval) /* try to return the 1st error. */
4217 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4218 struct sctp_assoc_value *p,
4219 unsigned int optlen)
4221 struct sctp_sock *sp = sctp_sk(sk);
4222 struct sctp_association *asoc;
4224 if (optlen < sizeof(*p))
4227 asoc = sctp_id2assoc(sk, p->assoc_id);
4228 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4231 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4235 sp->ep->intl_enable = !!p->assoc_value;
4239 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4240 unsigned int optlen)
4242 if (!sctp_style(sk, TCP))
4245 if (sctp_sk(sk)->ep->base.bind_addr.port)
4248 if (optlen < sizeof(int))
4251 sctp_sk(sk)->reuse = !!*val;
4256 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4257 struct sctp_association *asoc)
4259 struct sctp_ulpevent *event;
4261 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4263 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4264 if (sctp_outq_is_empty(&asoc->outqueue)) {
4265 event = sctp_ulpevent_make_sender_dry_event(asoc,
4266 GFP_USER | __GFP_NOWARN);
4270 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4277 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4278 unsigned int optlen)
4280 struct sctp_sock *sp = sctp_sk(sk);
4281 struct sctp_association *asoc;
4284 if (optlen < sizeof(*param))
4287 if (param->se_type < SCTP_SN_TYPE_BASE ||
4288 param->se_type > SCTP_SN_TYPE_MAX)
4291 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4292 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4293 sctp_style(sk, UDP))
4297 return sctp_assoc_ulpevent_type_set(param, asoc);
4299 if (sctp_style(sk, TCP))
4300 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4302 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4303 param->se_assoc_id == SCTP_ALL_ASSOC)
4304 sctp_ulpevent_type_set(&sp->subscribe,
4305 param->se_type, param->se_on);
4307 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4308 param->se_assoc_id == SCTP_ALL_ASSOC) {
4309 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4310 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4320 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4321 struct sctp_assoc_value *params,
4322 unsigned int optlen)
4324 struct sctp_association *asoc;
4325 struct sctp_endpoint *ep;
4326 int retval = -EINVAL;
4328 if (optlen != sizeof(*params))
4331 asoc = sctp_id2assoc(sk, params->assoc_id);
4332 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4333 sctp_style(sk, UDP))
4336 ep = sctp_sk(sk)->ep;
4337 ep->asconf_enable = !!params->assoc_value;
4339 if (ep->asconf_enable && ep->auth_enable) {
4340 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4341 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4350 static int sctp_setsockopt_auth_supported(struct sock *sk,
4351 struct sctp_assoc_value *params,
4352 unsigned int optlen)
4354 struct sctp_association *asoc;
4355 struct sctp_endpoint *ep;
4356 int retval = -EINVAL;
4358 if (optlen != sizeof(*params))
4361 asoc = sctp_id2assoc(sk, params->assoc_id);
4362 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4363 sctp_style(sk, UDP))
4366 ep = sctp_sk(sk)->ep;
4367 if (params->assoc_value) {
4368 retval = sctp_auth_init(ep, GFP_KERNEL);
4371 if (ep->asconf_enable) {
4372 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4373 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4377 ep->auth_enable = !!params->assoc_value;
4384 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4385 struct sctp_assoc_value *params,
4386 unsigned int optlen)
4388 struct sctp_association *asoc;
4389 int retval = -EINVAL;
4391 if (optlen != sizeof(*params))
4394 asoc = sctp_id2assoc(sk, params->assoc_id);
4395 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4396 sctp_style(sk, UDP))
4399 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4406 static int sctp_setsockopt_pf_expose(struct sock *sk,
4407 struct sctp_assoc_value *params,
4408 unsigned int optlen)
4410 struct sctp_association *asoc;
4411 int retval = -EINVAL;
4413 if (optlen != sizeof(*params))
4416 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4419 asoc = sctp_id2assoc(sk, params->assoc_id);
4420 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4421 sctp_style(sk, UDP))
4425 asoc->pf_expose = params->assoc_value;
4427 sctp_sk(sk)->pf_expose = params->assoc_value;
4434 static int sctp_setsockopt_encap_port(struct sock *sk,
4435 struct sctp_udpencaps *encap,
4436 unsigned int optlen)
4438 struct sctp_association *asoc;
4439 struct sctp_transport *t;
4442 if (optlen != sizeof(*encap))
4445 /* If an address other than INADDR_ANY is specified, and
4446 * no transport is found, then the request is invalid.
4448 encap_port = (__force __be16)encap->sue_port;
4449 if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4450 t = sctp_addr_id2transport(sk, &encap->sue_address,
4451 encap->sue_assoc_id);
4455 t->encap_port = encap_port;
4459 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4460 * socket is a one to many style socket, and an association
4461 * was not found, then the id was invalid.
4463 asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4464 if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4465 sctp_style(sk, UDP))
4468 /* If changes are for association, also apply encap_port to
4472 list_for_each_entry(t, &asoc->peer.transport_addr_list,
4474 t->encap_port = encap_port;
4476 asoc->encap_port = encap_port;
4480 sctp_sk(sk)->encap_port = encap_port;
4484 /* API 6.2 setsockopt(), getsockopt()
4486 * Applications use setsockopt() and getsockopt() to set or retrieve
4487 * socket options. Socket options are used to change the default
4488 * behavior of sockets calls. They are described in Section 7.
4492 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4493 * int __user *optlen);
4494 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4497 * sd - the socket descript.
4498 * level - set to IPPROTO_SCTP for all SCTP options.
4499 * optname - the option name.
4500 * optval - the buffer to store the value of the option.
4501 * optlen - the size of the buffer.
4503 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4504 sockptr_t optval, unsigned int optlen)
4509 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4511 /* I can hardly begin to describe how wrong this is. This is
4512 * so broken as to be worse than useless. The API draft
4513 * REALLY is NOT helpful here... I am not convinced that the
4514 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4515 * are at all well-founded.
4517 if (level != SOL_SCTP) {
4518 struct sctp_af *af = sctp_sk(sk)->pf->af;
4520 return af->setsockopt(sk, level, optname, optval, optlen);
4524 kopt = memdup_sockptr(optval, optlen);
4526 return PTR_ERR(kopt);
4532 case SCTP_SOCKOPT_BINDX_ADD:
4533 /* 'optlen' is the size of the addresses buffer. */
4534 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4535 SCTP_BINDX_ADD_ADDR);
4538 case SCTP_SOCKOPT_BINDX_REM:
4539 /* 'optlen' is the size of the addresses buffer. */
4540 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4541 SCTP_BINDX_REM_ADDR);
4544 case SCTP_SOCKOPT_CONNECTX_OLD:
4545 /* 'optlen' is the size of the addresses buffer. */
4546 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4549 case SCTP_SOCKOPT_CONNECTX:
4550 /* 'optlen' is the size of the addresses buffer. */
4551 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4554 case SCTP_DISABLE_FRAGMENTS:
4555 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4559 retval = sctp_setsockopt_events(sk, kopt, optlen);
4562 case SCTP_AUTOCLOSE:
4563 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4566 case SCTP_PEER_ADDR_PARAMS:
4567 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4570 case SCTP_DELAYED_SACK:
4571 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4573 case SCTP_PARTIAL_DELIVERY_POINT:
4574 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4578 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4580 case SCTP_DEFAULT_SEND_PARAM:
4581 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4583 case SCTP_DEFAULT_SNDINFO:
4584 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4586 case SCTP_PRIMARY_ADDR:
4587 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4589 case SCTP_SET_PEER_PRIMARY_ADDR:
4590 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4593 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4596 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4598 case SCTP_ASSOCINFO:
4599 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4601 case SCTP_I_WANT_MAPPED_V4_ADDR:
4602 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4605 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4607 case SCTP_ADAPTATION_LAYER:
4608 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4611 retval = sctp_setsockopt_context(sk, kopt, optlen);
4613 case SCTP_FRAGMENT_INTERLEAVE:
4614 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4616 case SCTP_MAX_BURST:
4617 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4619 case SCTP_AUTH_CHUNK:
4620 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4622 case SCTP_HMAC_IDENT:
4623 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4626 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4628 case SCTP_AUTH_ACTIVE_KEY:
4629 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4631 case SCTP_AUTH_DELETE_KEY:
4632 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4634 case SCTP_AUTH_DEACTIVATE_KEY:
4635 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4637 case SCTP_AUTO_ASCONF:
4638 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4640 case SCTP_PEER_ADDR_THLDS:
4641 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4644 case SCTP_PEER_ADDR_THLDS_V2:
4645 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4648 case SCTP_RECVRCVINFO:
4649 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4651 case SCTP_RECVNXTINFO:
4652 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4654 case SCTP_PR_SUPPORTED:
4655 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4657 case SCTP_DEFAULT_PRINFO:
4658 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4660 case SCTP_RECONFIG_SUPPORTED:
4661 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4663 case SCTP_ENABLE_STREAM_RESET:
4664 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4666 case SCTP_RESET_STREAMS:
4667 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4669 case SCTP_RESET_ASSOC:
4670 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4672 case SCTP_ADD_STREAMS:
4673 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4675 case SCTP_STREAM_SCHEDULER:
4676 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4678 case SCTP_STREAM_SCHEDULER_VALUE:
4679 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4681 case SCTP_INTERLEAVING_SUPPORTED:
4682 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4685 case SCTP_REUSE_PORT:
4686 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4689 retval = sctp_setsockopt_event(sk, kopt, optlen);
4691 case SCTP_ASCONF_SUPPORTED:
4692 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4694 case SCTP_AUTH_SUPPORTED:
4695 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4697 case SCTP_ECN_SUPPORTED:
4698 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4700 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4701 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4703 case SCTP_REMOTE_UDP_ENCAPS_PORT:
4704 retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4707 retval = -ENOPROTOOPT;
4716 /* API 3.1.6 connect() - UDP Style Syntax
4718 * An application may use the connect() call in the UDP model to initiate an
4719 * association without sending data.
4723 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4725 * sd: the socket descriptor to have a new association added to.
4727 * nam: the address structure (either struct sockaddr_in or struct
4728 * sockaddr_in6 defined in RFC2553 [7]).
4730 * len: the size of the address.
4732 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4733 int addr_len, int flags)
4739 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4742 /* Validate addr_len before calling common connect/connectx routine. */
4743 af = sctp_get_af_specific(addr->sa_family);
4744 if (af && addr_len >= af->sockaddr_len)
4745 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4751 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4752 int addr_len, int flags)
4754 if (addr_len < sizeof(uaddr->sa_family))
4757 if (uaddr->sa_family == AF_UNSPEC)
4760 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4763 /* FIXME: Write comments. */
4764 static int sctp_disconnect(struct sock *sk, int flags)
4766 return -EOPNOTSUPP; /* STUB */
4769 /* 4.1.4 accept() - TCP Style Syntax
4771 * Applications use accept() call to remove an established SCTP
4772 * association from the accept queue of the endpoint. A new socket
4773 * descriptor will be returned from accept() to represent the newly
4774 * formed association.
4776 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4778 struct sctp_sock *sp;
4779 struct sctp_endpoint *ep;
4780 struct sock *newsk = NULL;
4781 struct sctp_association *asoc;
4790 if (!sctp_style(sk, TCP)) {
4791 error = -EOPNOTSUPP;
4795 if (!sctp_sstate(sk, LISTENING)) {
4800 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4802 error = sctp_wait_for_accept(sk, timeo);
4806 /* We treat the list of associations on the endpoint as the accept
4807 * queue and pick the first association on the list.
4809 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4811 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4817 /* Populate the fields of the newsk from the oldsk and migrate the
4818 * asoc to the newsk.
4820 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4822 sk_common_release(newsk);
4832 /* The SCTP ioctl handler. */
4833 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4840 * SEQPACKET-style sockets in LISTENING state are valid, for
4841 * SCTP, so only discard TCP-style sockets in LISTENING state.
4843 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4848 struct sk_buff *skb;
4849 unsigned int amount = 0;
4851 skb = skb_peek(&sk->sk_receive_queue);
4854 * We will only return the amount of this packet since
4855 * that is all that will be read.
4859 rc = put_user(amount, (int __user *)arg);
4871 /* This is the function which gets called during socket creation to
4872 * initialized the SCTP-specific portion of the sock.
4873 * The sock structure should already be zero-filled memory.
4875 static int sctp_init_sock(struct sock *sk)
4877 struct net *net = sock_net(sk);
4878 struct sctp_sock *sp;
4880 pr_debug("%s: sk:%p\n", __func__, sk);
4884 /* Initialize the SCTP per socket area. */
4885 switch (sk->sk_type) {
4886 case SOCK_SEQPACKET:
4887 sp->type = SCTP_SOCKET_UDP;
4890 sp->type = SCTP_SOCKET_TCP;
4893 return -ESOCKTNOSUPPORT;
4896 sk->sk_gso_type = SKB_GSO_SCTP;
4898 /* Initialize default send parameters. These parameters can be
4899 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4901 sp->default_stream = 0;
4902 sp->default_ppid = 0;
4903 sp->default_flags = 0;
4904 sp->default_context = 0;
4905 sp->default_timetolive = 0;
4907 sp->default_rcv_context = 0;
4908 sp->max_burst = net->sctp.max_burst;
4910 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4912 /* Initialize default setup parameters. These parameters
4913 * can be modified with the SCTP_INITMSG socket option or
4914 * overridden by the SCTP_INIT CMSG.
4916 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4917 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4918 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4919 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4921 /* Initialize default RTO related parameters. These parameters can
4922 * be modified for with the SCTP_RTOINFO socket option.
4924 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4925 sp->rtoinfo.srto_max = net->sctp.rto_max;
4926 sp->rtoinfo.srto_min = net->sctp.rto_min;
4928 /* Initialize default association related parameters. These parameters
4929 * can be modified with the SCTP_ASSOCINFO socket option.
4931 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4932 sp->assocparams.sasoc_number_peer_destinations = 0;
4933 sp->assocparams.sasoc_peer_rwnd = 0;
4934 sp->assocparams.sasoc_local_rwnd = 0;
4935 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4937 /* Initialize default event subscriptions. By default, all the
4942 /* Default Peer Address Parameters. These defaults can
4943 * be modified via SCTP_PEER_ADDR_PARAMS
4945 sp->hbinterval = net->sctp.hb_interval;
4946 sp->udp_port = htons(net->sctp.udp_port);
4947 sp->encap_port = htons(net->sctp.encap_port);
4948 sp->pathmaxrxt = net->sctp.max_retrans_path;
4949 sp->pf_retrans = net->sctp.pf_retrans;
4950 sp->ps_retrans = net->sctp.ps_retrans;
4951 sp->pf_expose = net->sctp.pf_expose;
4952 sp->pathmtu = 0; /* allow default discovery */
4953 sp->sackdelay = net->sctp.sack_timeout;
4955 sp->param_flags = SPP_HB_ENABLE |
4957 SPP_SACKDELAY_ENABLE;
4958 sp->default_ss = SCTP_SS_DEFAULT;
4960 /* If enabled no SCTP message fragmentation will be performed.
4961 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4963 sp->disable_fragments = 0;
4965 /* Enable Nagle algorithm by default. */
4968 sp->recvrcvinfo = 0;
4969 sp->recvnxtinfo = 0;
4971 /* Enable by default. */
4974 /* Auto-close idle associations after the configured
4975 * number of seconds. A value of 0 disables this
4976 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4977 * for UDP-style sockets only.
4981 /* User specified fragmentation limit. */
4984 sp->adaptation_ind = 0;
4986 sp->pf = sctp_get_pf_specific(sk->sk_family);
4988 /* Control variables for partial data delivery. */
4989 atomic_set(&sp->pd_mode, 0);
4990 skb_queue_head_init(&sp->pd_lobby);
4991 sp->frag_interleave = 0;
4993 /* Create a per socket endpoint structure. Even if we
4994 * change the data structure relationships, this may still
4995 * be useful for storing pre-connect address information.
4997 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5003 sk->sk_destruct = sctp_destruct_sock;
5005 SCTP_DBG_OBJCNT_INC(sock);
5008 sk_sockets_allocated_inc(sk);
5009 sock_prot_inuse_add(net, sk->sk_prot, 1);
5016 /* Cleanup any SCTP per socket resources. Must be called with
5017 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5019 static void sctp_destroy_sock(struct sock *sk)
5021 struct sctp_sock *sp;
5023 pr_debug("%s: sk:%p\n", __func__, sk);
5025 /* Release our hold on the endpoint. */
5027 /* This could happen during socket init, thus we bail out
5028 * early, since the rest of the below is not setup either.
5033 if (sp->do_auto_asconf) {
5034 sp->do_auto_asconf = 0;
5035 list_del(&sp->auto_asconf_list);
5037 sctp_endpoint_free(sp->ep);
5039 sk_sockets_allocated_dec(sk);
5040 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5044 /* Triggered when there are no references on the socket anymore */
5045 static void sctp_destruct_sock(struct sock *sk)
5047 struct sctp_sock *sp = sctp_sk(sk);
5049 /* Free up the HMAC transform. */
5050 crypto_free_shash(sp->hmac);
5052 inet_sock_destruct(sk);
5055 /* API 4.1.7 shutdown() - TCP Style Syntax
5056 * int shutdown(int socket, int how);
5058 * sd - the socket descriptor of the association to be closed.
5059 * how - Specifies the type of shutdown. The values are
5062 * Disables further receive operations. No SCTP
5063 * protocol action is taken.
5065 * Disables further send operations, and initiates
5066 * the SCTP shutdown sequence.
5068 * Disables further send and receive operations
5069 * and initiates the SCTP shutdown sequence.
5071 static void sctp_shutdown(struct sock *sk, int how)
5073 struct net *net = sock_net(sk);
5074 struct sctp_endpoint *ep;
5076 if (!sctp_style(sk, TCP))
5079 ep = sctp_sk(sk)->ep;
5080 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5081 struct sctp_association *asoc;
5083 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5084 asoc = list_entry(ep->asocs.next,
5085 struct sctp_association, asocs);
5086 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5090 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5091 struct sctp_info *info)
5093 struct sctp_transport *prim;
5094 struct list_head *pos;
5097 memset(info, 0, sizeof(*info));
5099 struct sctp_sock *sp = sctp_sk(sk);
5101 info->sctpi_s_autoclose = sp->autoclose;
5102 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5103 info->sctpi_s_pd_point = sp->pd_point;
5104 info->sctpi_s_nodelay = sp->nodelay;
5105 info->sctpi_s_disable_fragments = sp->disable_fragments;
5106 info->sctpi_s_v4mapped = sp->v4mapped;
5107 info->sctpi_s_frag_interleave = sp->frag_interleave;
5108 info->sctpi_s_type = sp->type;
5113 info->sctpi_tag = asoc->c.my_vtag;
5114 info->sctpi_state = asoc->state;
5115 info->sctpi_rwnd = asoc->a_rwnd;
5116 info->sctpi_unackdata = asoc->unack_data;
5117 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5118 info->sctpi_instrms = asoc->stream.incnt;
5119 info->sctpi_outstrms = asoc->stream.outcnt;
5120 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5121 info->sctpi_inqueue++;
5122 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5123 info->sctpi_outqueue++;
5124 info->sctpi_overall_error = asoc->overall_error_count;
5125 info->sctpi_max_burst = asoc->max_burst;
5126 info->sctpi_maxseg = asoc->frag_point;
5127 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5128 info->sctpi_peer_tag = asoc->c.peer_vtag;
5130 mask = asoc->peer.ecn_capable << 1;
5131 mask = (mask | asoc->peer.ipv4_address) << 1;
5132 mask = (mask | asoc->peer.ipv6_address) << 1;
5133 mask = (mask | asoc->peer.hostname_address) << 1;
5134 mask = (mask | asoc->peer.asconf_capable) << 1;
5135 mask = (mask | asoc->peer.prsctp_capable) << 1;
5136 mask = (mask | asoc->peer.auth_capable);
5137 info->sctpi_peer_capable = mask;
5138 mask = asoc->peer.sack_needed << 1;
5139 mask = (mask | asoc->peer.sack_generation) << 1;
5140 mask = (mask | asoc->peer.zero_window_announced);
5141 info->sctpi_peer_sack = mask;
5143 info->sctpi_isacks = asoc->stats.isacks;
5144 info->sctpi_osacks = asoc->stats.osacks;
5145 info->sctpi_opackets = asoc->stats.opackets;
5146 info->sctpi_ipackets = asoc->stats.ipackets;
5147 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5148 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5149 info->sctpi_idupchunks = asoc->stats.idupchunks;
5150 info->sctpi_gapcnt = asoc->stats.gapcnt;
5151 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5152 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5153 info->sctpi_oodchunks = asoc->stats.oodchunks;
5154 info->sctpi_iodchunks = asoc->stats.iodchunks;
5155 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5156 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5158 prim = asoc->peer.primary_path;
5159 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5160 info->sctpi_p_state = prim->state;
5161 info->sctpi_p_cwnd = prim->cwnd;
5162 info->sctpi_p_srtt = prim->srtt;
5163 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5164 info->sctpi_p_hbinterval = prim->hbinterval;
5165 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5166 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5167 info->sctpi_p_ssthresh = prim->ssthresh;
5168 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5169 info->sctpi_p_flight_size = prim->flight_size;
5170 info->sctpi_p_error = prim->error_count;
5174 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5176 /* use callback to avoid exporting the core structure */
5177 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5179 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5181 rhashtable_walk_start(iter);
5184 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5186 rhashtable_walk_stop(iter);
5187 rhashtable_walk_exit(iter);
5190 struct sctp_transport *sctp_transport_get_next(struct net *net,
5191 struct rhashtable_iter *iter)
5193 struct sctp_transport *t;
5195 t = rhashtable_walk_next(iter);
5196 for (; t; t = rhashtable_walk_next(iter)) {
5198 if (PTR_ERR(t) == -EAGAIN)
5203 if (!sctp_transport_hold(t))
5206 if (net_eq(t->asoc->base.net, net) &&
5207 t->asoc->peer.primary_path == t)
5210 sctp_transport_put(t);
5216 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5217 struct rhashtable_iter *iter,
5220 struct sctp_transport *t;
5223 return SEQ_START_TOKEN;
5225 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5228 sctp_transport_put(t);
5234 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5238 struct sctp_ep_common *epb;
5239 struct sctp_hashbucket *head;
5241 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5243 read_lock_bh(&head->lock);
5244 sctp_for_each_hentry(epb, &head->chain) {
5245 err = cb(sctp_ep(epb), p);
5249 read_unlock_bh(&head->lock);
5254 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5256 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5258 const union sctp_addr *laddr,
5259 const union sctp_addr *paddr, void *p)
5261 struct sctp_transport *transport;
5265 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5270 err = cb(transport, p);
5271 sctp_transport_put(transport);
5275 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5277 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5278 int (*cb_done)(struct sctp_transport *, void *),
5279 struct net *net, int *pos, void *p) {
5280 struct rhashtable_iter hti;
5281 struct sctp_transport *tsp;
5286 sctp_transport_walk_start(&hti);
5288 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5289 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5294 sctp_transport_put(tsp);
5296 sctp_transport_walk_stop(&hti);
5299 if (cb_done && !cb_done(tsp, p)) {
5301 sctp_transport_put(tsp);
5304 sctp_transport_put(tsp);
5309 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5311 /* 7.2.1 Association Status (SCTP_STATUS)
5313 * Applications can retrieve current status information about an
5314 * association, including association state, peer receiver window size,
5315 * number of unacked data chunks, and number of data chunks pending
5316 * receipt. This information is read-only.
5318 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5319 char __user *optval,
5322 struct sctp_status status;
5323 struct sctp_association *asoc = NULL;
5324 struct sctp_transport *transport;
5325 sctp_assoc_t associd;
5328 if (len < sizeof(status)) {
5333 len = sizeof(status);
5334 if (copy_from_user(&status, optval, len)) {
5339 associd = status.sstat_assoc_id;
5340 asoc = sctp_id2assoc(sk, associd);
5346 transport = asoc->peer.primary_path;
5348 status.sstat_assoc_id = sctp_assoc2id(asoc);
5349 status.sstat_state = sctp_assoc_to_state(asoc);
5350 status.sstat_rwnd = asoc->peer.rwnd;
5351 status.sstat_unackdata = asoc->unack_data;
5353 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5354 status.sstat_instrms = asoc->stream.incnt;
5355 status.sstat_outstrms = asoc->stream.outcnt;
5356 status.sstat_fragmentation_point = asoc->frag_point;
5357 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5358 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5359 transport->af_specific->sockaddr_len);
5360 /* Map ipv4 address into v4-mapped-on-v6 address. */
5361 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5362 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5363 status.sstat_primary.spinfo_state = transport->state;
5364 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5365 status.sstat_primary.spinfo_srtt = transport->srtt;
5366 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5367 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5369 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5370 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5372 if (put_user(len, optlen)) {
5377 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5378 __func__, len, status.sstat_state, status.sstat_rwnd,
5379 status.sstat_assoc_id);
5381 if (copy_to_user(optval, &status, len)) {
5391 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5393 * Applications can retrieve information about a specific peer address
5394 * of an association, including its reachability state, congestion
5395 * window, and retransmission timer values. This information is
5398 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5399 char __user *optval,
5402 struct sctp_paddrinfo pinfo;
5403 struct sctp_transport *transport;
5406 if (len < sizeof(pinfo)) {
5411 len = sizeof(pinfo);
5412 if (copy_from_user(&pinfo, optval, len)) {
5417 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5418 pinfo.spinfo_assoc_id);
5424 if (transport->state == SCTP_PF &&
5425 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5430 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5431 pinfo.spinfo_state = transport->state;
5432 pinfo.spinfo_cwnd = transport->cwnd;
5433 pinfo.spinfo_srtt = transport->srtt;
5434 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5435 pinfo.spinfo_mtu = transport->pathmtu;
5437 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5438 pinfo.spinfo_state = SCTP_ACTIVE;
5440 if (put_user(len, optlen)) {
5445 if (copy_to_user(optval, &pinfo, len)) {
5454 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5456 * This option is a on/off flag. If enabled no SCTP message
5457 * fragmentation will be performed. Instead if a message being sent
5458 * exceeds the current PMTU size, the message will NOT be sent and
5459 * instead a error will be indicated to the user.
5461 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5462 char __user *optval, int __user *optlen)
5466 if (len < sizeof(int))
5470 val = (sctp_sk(sk)->disable_fragments == 1);
5471 if (put_user(len, optlen))
5473 if (copy_to_user(optval, &val, len))
5478 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5480 * This socket option is used to specify various notifications and
5481 * ancillary data the user wishes to receive.
5483 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5486 struct sctp_event_subscribe subscribe;
5487 __u8 *sn_type = (__u8 *)&subscribe;
5492 if (len > sizeof(struct sctp_event_subscribe))
5493 len = sizeof(struct sctp_event_subscribe);
5494 if (put_user(len, optlen))
5497 for (i = 0; i < len; i++)
5498 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5499 SCTP_SN_TYPE_BASE + i);
5501 if (copy_to_user(optval, &subscribe, len))
5507 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5509 * This socket option is applicable to the UDP-style socket only. When
5510 * set it will cause associations that are idle for more than the
5511 * specified number of seconds to automatically close. An association
5512 * being idle is defined an association that has NOT sent or received
5513 * user data. The special value of '0' indicates that no automatic
5514 * close of any associations should be performed. The option expects an
5515 * integer defining the number of seconds of idle time before an
5516 * association is closed.
5518 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5520 /* Applicable to UDP-style socket only */
5521 if (sctp_style(sk, TCP))
5523 if (len < sizeof(int))
5526 if (put_user(len, optlen))
5528 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5533 /* Helper routine to branch off an association to a new socket. */
5534 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5536 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5537 struct sctp_sock *sp = sctp_sk(sk);
5538 struct socket *sock;
5541 /* Do not peel off from one netns to another one. */
5542 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5548 /* An association cannot be branched off from an already peeled-off
5549 * socket, nor is this supported for tcp style sockets.
5551 if (!sctp_style(sk, UDP))
5554 /* Create a new socket. */
5555 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5559 sctp_copy_sock(sock->sk, sk, asoc);
5561 /* Make peeled-off sockets more like 1-1 accepted sockets.
5562 * Set the daddr and initialize id to something more random and also
5563 * copy over any ip options.
5565 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5566 sp->pf->copy_ip_options(sk, sock->sk);
5568 /* Populate the fields of the newsk from the oldsk and migrate the
5569 * asoc to the newsk.
5571 err = sctp_sock_migrate(sk, sock->sk, asoc,
5572 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5582 EXPORT_SYMBOL(sctp_do_peeloff);
5584 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5585 struct file **newfile, unsigned flags)
5587 struct socket *newsock;
5590 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5594 /* Map the socket to an unused fd that can be returned to the user. */
5595 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5597 sock_release(newsock);
5601 *newfile = sock_alloc_file(newsock, 0, NULL);
5602 if (IS_ERR(*newfile)) {
5603 put_unused_fd(retval);
5604 retval = PTR_ERR(*newfile);
5609 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5612 peeloff->sd = retval;
5614 if (flags & SOCK_NONBLOCK)
5615 (*newfile)->f_flags |= O_NONBLOCK;
5620 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5622 sctp_peeloff_arg_t peeloff;
5623 struct file *newfile = NULL;
5626 if (len < sizeof(sctp_peeloff_arg_t))
5628 len = sizeof(sctp_peeloff_arg_t);
5629 if (copy_from_user(&peeloff, optval, len))
5632 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5636 /* Return the fd mapped to the new socket. */
5637 if (put_user(len, optlen)) {
5639 put_unused_fd(retval);
5643 if (copy_to_user(optval, &peeloff, len)) {
5645 put_unused_fd(retval);
5648 fd_install(retval, newfile);
5653 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5654 char __user *optval, int __user *optlen)
5656 sctp_peeloff_flags_arg_t peeloff;
5657 struct file *newfile = NULL;
5660 if (len < sizeof(sctp_peeloff_flags_arg_t))
5662 len = sizeof(sctp_peeloff_flags_arg_t);
5663 if (copy_from_user(&peeloff, optval, len))
5666 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5667 &newfile, peeloff.flags);
5671 /* Return the fd mapped to the new socket. */
5672 if (put_user(len, optlen)) {
5674 put_unused_fd(retval);
5678 if (copy_to_user(optval, &peeloff, len)) {
5680 put_unused_fd(retval);
5683 fd_install(retval, newfile);
5688 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5690 * Applications can enable or disable heartbeats for any peer address of
5691 * an association, modify an address's heartbeat interval, force a
5692 * heartbeat to be sent immediately, and adjust the address's maximum
5693 * number of retransmissions sent before an address is considered
5694 * unreachable. The following structure is used to access and modify an
5695 * address's parameters:
5697 * struct sctp_paddrparams {
5698 * sctp_assoc_t spp_assoc_id;
5699 * struct sockaddr_storage spp_address;
5700 * uint32_t spp_hbinterval;
5701 * uint16_t spp_pathmaxrxt;
5702 * uint32_t spp_pathmtu;
5703 * uint32_t spp_sackdelay;
5704 * uint32_t spp_flags;
5707 * spp_assoc_id - (one-to-many style socket) This is filled in the
5708 * application, and identifies the association for
5710 * spp_address - This specifies which address is of interest.
5711 * spp_hbinterval - This contains the value of the heartbeat interval,
5712 * in milliseconds. If a value of zero
5713 * is present in this field then no changes are to
5714 * be made to this parameter.
5715 * spp_pathmaxrxt - This contains the maximum number of
5716 * retransmissions before this address shall be
5717 * considered unreachable. If a value of zero
5718 * is present in this field then no changes are to
5719 * be made to this parameter.
5720 * spp_pathmtu - When Path MTU discovery is disabled the value
5721 * specified here will be the "fixed" path mtu.
5722 * Note that if the spp_address field is empty
5723 * then all associations on this address will
5724 * have this fixed path mtu set upon them.
5726 * spp_sackdelay - When delayed sack is enabled, this value specifies
5727 * the number of milliseconds that sacks will be delayed
5728 * for. This value will apply to all addresses of an
5729 * association if the spp_address field is empty. Note
5730 * also, that if delayed sack is enabled and this
5731 * value is set to 0, no change is made to the last
5732 * recorded delayed sack timer value.
5734 * spp_flags - These flags are used to control various features
5735 * on an association. The flag field may contain
5736 * zero or more of the following options.
5738 * SPP_HB_ENABLE - Enable heartbeats on the
5739 * specified address. Note that if the address
5740 * field is empty all addresses for the association
5741 * have heartbeats enabled upon them.
5743 * SPP_HB_DISABLE - Disable heartbeats on the
5744 * speicifed address. Note that if the address
5745 * field is empty all addresses for the association
5746 * will have their heartbeats disabled. Note also
5747 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5748 * mutually exclusive, only one of these two should
5749 * be specified. Enabling both fields will have
5750 * undetermined results.
5752 * SPP_HB_DEMAND - Request a user initiated heartbeat
5753 * to be made immediately.
5755 * SPP_PMTUD_ENABLE - This field will enable PMTU
5756 * discovery upon the specified address. Note that
5757 * if the address feild is empty then all addresses
5758 * on the association are effected.
5760 * SPP_PMTUD_DISABLE - This field will disable PMTU
5761 * discovery upon the specified address. Note that
5762 * if the address feild is empty then all addresses
5763 * on the association are effected. Not also that
5764 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5765 * exclusive. Enabling both will have undetermined
5768 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5769 * on delayed sack. The time specified in spp_sackdelay
5770 * is used to specify the sack delay for this address. Note
5771 * that if spp_address is empty then all addresses will
5772 * enable delayed sack and take on the sack delay
5773 * value specified in spp_sackdelay.
5774 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5775 * off delayed sack. If the spp_address field is blank then
5776 * delayed sack is disabled for the entire association. Note
5777 * also that this field is mutually exclusive to
5778 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5781 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5782 * setting of the IPV6 flow label value. The value is
5783 * contained in the spp_ipv6_flowlabel field.
5784 * Upon retrieval, this flag will be set to indicate that
5785 * the spp_ipv6_flowlabel field has a valid value returned.
5786 * If a specific destination address is set (in the
5787 * spp_address field), then the value returned is that of
5788 * the address. If just an association is specified (and
5789 * no address), then the association's default flow label
5790 * is returned. If neither an association nor a destination
5791 * is specified, then the socket's default flow label is
5792 * returned. For non-IPv6 sockets, this flag will be left
5795 * SPP_DSCP: Setting this flag enables the setting of the
5796 * Differentiated Services Code Point (DSCP) value
5797 * associated with either the association or a specific
5798 * address. The value is obtained in the spp_dscp field.
5799 * Upon retrieval, this flag will be set to indicate that
5800 * the spp_dscp field has a valid value returned. If a
5801 * specific destination address is set when called (in the
5802 * spp_address field), then that specific destination
5803 * address's DSCP value is returned. If just an association
5804 * is specified, then the association's default DSCP is
5805 * returned. If neither an association nor a destination is
5806 * specified, then the socket's default DSCP is returned.
5808 * spp_ipv6_flowlabel
5809 * - This field is used in conjunction with the
5810 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5811 * The 20 least significant bits are used for the flow
5812 * label. This setting has precedence over any IPv6-layer
5815 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5816 * and contains the DSCP. The 6 most significant bits are
5817 * used for the DSCP. This setting has precedence over any
5818 * IPv4- or IPv6- layer setting.
5820 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5821 char __user *optval, int __user *optlen)
5823 struct sctp_paddrparams params;
5824 struct sctp_transport *trans = NULL;
5825 struct sctp_association *asoc = NULL;
5826 struct sctp_sock *sp = sctp_sk(sk);
5828 if (len >= sizeof(params))
5829 len = sizeof(params);
5830 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5831 spp_ipv6_flowlabel), 4))
5832 len = ALIGN(offsetof(struct sctp_paddrparams,
5833 spp_ipv6_flowlabel), 4);
5837 if (copy_from_user(¶ms, optval, len))
5840 /* If an address other than INADDR_ANY is specified, and
5841 * no transport is found, then the request is invalid.
5843 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5844 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5845 params.spp_assoc_id);
5847 pr_debug("%s: failed no transport\n", __func__);
5852 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5853 * socket is a one to many style socket, and an association
5854 * was not found, then the id was invalid.
5856 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5857 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5858 sctp_style(sk, UDP)) {
5859 pr_debug("%s: failed no association\n", __func__);
5864 /* Fetch transport values. */
5865 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5866 params.spp_pathmtu = trans->pathmtu;
5867 params.spp_pathmaxrxt = trans->pathmaxrxt;
5868 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5870 /*draft-11 doesn't say what to return in spp_flags*/
5871 params.spp_flags = trans->param_flags;
5872 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5873 params.spp_ipv6_flowlabel = trans->flowlabel &
5874 SCTP_FLOWLABEL_VAL_MASK;
5875 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5877 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5878 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5879 params.spp_flags |= SPP_DSCP;
5882 /* Fetch association values. */
5883 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5884 params.spp_pathmtu = asoc->pathmtu;
5885 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5886 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5888 /*draft-11 doesn't say what to return in spp_flags*/
5889 params.spp_flags = asoc->param_flags;
5890 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5891 params.spp_ipv6_flowlabel = asoc->flowlabel &
5892 SCTP_FLOWLABEL_VAL_MASK;
5893 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5895 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5896 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5897 params.spp_flags |= SPP_DSCP;
5900 /* Fetch socket values. */
5901 params.spp_hbinterval = sp->hbinterval;
5902 params.spp_pathmtu = sp->pathmtu;
5903 params.spp_sackdelay = sp->sackdelay;
5904 params.spp_pathmaxrxt = sp->pathmaxrxt;
5906 /*draft-11 doesn't say what to return in spp_flags*/
5907 params.spp_flags = sp->param_flags;
5908 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5909 params.spp_ipv6_flowlabel = sp->flowlabel &
5910 SCTP_FLOWLABEL_VAL_MASK;
5911 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5913 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5914 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5915 params.spp_flags |= SPP_DSCP;
5919 if (copy_to_user(optval, ¶ms, len))
5922 if (put_user(len, optlen))
5929 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5931 * This option will effect the way delayed acks are performed. This
5932 * option allows you to get or set the delayed ack time, in
5933 * milliseconds. It also allows changing the delayed ack frequency.
5934 * Changing the frequency to 1 disables the delayed sack algorithm. If
5935 * the assoc_id is 0, then this sets or gets the endpoints default
5936 * values. If the assoc_id field is non-zero, then the set or get
5937 * effects the specified association for the one to many model (the
5938 * assoc_id field is ignored by the one to one model). Note that if
5939 * sack_delay or sack_freq are 0 when setting this option, then the
5940 * current values will remain unchanged.
5942 * struct sctp_sack_info {
5943 * sctp_assoc_t sack_assoc_id;
5944 * uint32_t sack_delay;
5945 * uint32_t sack_freq;
5948 * sack_assoc_id - This parameter, indicates which association the user
5949 * is performing an action upon. Note that if this field's value is
5950 * zero then the endpoints default value is changed (effecting future
5951 * associations only).
5953 * sack_delay - This parameter contains the number of milliseconds that
5954 * the user is requesting the delayed ACK timer be set to. Note that
5955 * this value is defined in the standard to be between 200 and 500
5958 * sack_freq - This parameter contains the number of packets that must
5959 * be received before a sack is sent without waiting for the delay
5960 * timer to expire. The default value for this is 2, setting this
5961 * value to 1 will disable the delayed sack algorithm.
5963 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5964 char __user *optval,
5967 struct sctp_sack_info params;
5968 struct sctp_association *asoc = NULL;
5969 struct sctp_sock *sp = sctp_sk(sk);
5971 if (len >= sizeof(struct sctp_sack_info)) {
5972 len = sizeof(struct sctp_sack_info);
5974 if (copy_from_user(¶ms, optval, len))
5976 } else if (len == sizeof(struct sctp_assoc_value)) {
5977 pr_warn_ratelimited(DEPRECATED
5979 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5980 "Use struct sctp_sack_info instead\n",
5981 current->comm, task_pid_nr(current));
5982 if (copy_from_user(¶ms, optval, len))
5987 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5988 * socket is a one to many style socket, and an association
5989 * was not found, then the id was invalid.
5991 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5992 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
5993 sctp_style(sk, UDP))
5997 /* Fetch association values. */
5998 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5999 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6000 params.sack_freq = asoc->sackfreq;
6003 params.sack_delay = 0;
6004 params.sack_freq = 1;
6007 /* Fetch socket values. */
6008 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6009 params.sack_delay = sp->sackdelay;
6010 params.sack_freq = sp->sackfreq;
6012 params.sack_delay = 0;
6013 params.sack_freq = 1;
6017 if (copy_to_user(optval, ¶ms, len))
6020 if (put_user(len, optlen))
6026 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6028 * Applications can specify protocol parameters for the default association
6029 * initialization. The option name argument to setsockopt() and getsockopt()
6032 * Setting initialization parameters is effective only on an unconnected
6033 * socket (for UDP-style sockets only future associations are effected
6034 * by the change). With TCP-style sockets, this option is inherited by
6035 * sockets derived from a listener socket.
6037 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6039 if (len < sizeof(struct sctp_initmsg))
6041 len = sizeof(struct sctp_initmsg);
6042 if (put_user(len, optlen))
6044 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6050 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6051 char __user *optval, int __user *optlen)
6053 struct sctp_association *asoc;
6055 struct sctp_getaddrs getaddrs;
6056 struct sctp_transport *from;
6058 union sctp_addr temp;
6059 struct sctp_sock *sp = sctp_sk(sk);
6064 if (len < sizeof(struct sctp_getaddrs))
6067 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6070 /* For UDP-style sockets, id specifies the association to query. */
6071 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6075 to = optval + offsetof(struct sctp_getaddrs, addrs);
6076 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6078 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6080 memcpy(&temp, &from->ipaddr, sizeof(temp));
6081 addrlen = sctp_get_pf_specific(sk->sk_family)
6082 ->addr_to_user(sp, &temp);
6083 if (space_left < addrlen)
6085 if (copy_to_user(to, &temp, addrlen))
6089 space_left -= addrlen;
6092 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6094 bytes_copied = ((char __user *)to) - optval;
6095 if (put_user(bytes_copied, optlen))
6101 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6102 size_t space_left, int *bytes_copied)
6104 struct sctp_sockaddr_entry *addr;
6105 union sctp_addr temp;
6108 struct net *net = sock_net(sk);
6111 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6115 if ((PF_INET == sk->sk_family) &&
6116 (AF_INET6 == addr->a.sa.sa_family))
6118 if ((PF_INET6 == sk->sk_family) &&
6119 inet_v6_ipv6only(sk) &&
6120 (AF_INET == addr->a.sa.sa_family))
6122 memcpy(&temp, &addr->a, sizeof(temp));
6123 if (!temp.v4.sin_port)
6124 temp.v4.sin_port = htons(port);
6126 addrlen = sctp_get_pf_specific(sk->sk_family)
6127 ->addr_to_user(sctp_sk(sk), &temp);
6129 if (space_left < addrlen) {
6133 memcpy(to, &temp, addrlen);
6137 space_left -= addrlen;
6138 *bytes_copied += addrlen;
6146 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6147 char __user *optval, int __user *optlen)
6149 struct sctp_bind_addr *bp;
6150 struct sctp_association *asoc;
6152 struct sctp_getaddrs getaddrs;
6153 struct sctp_sockaddr_entry *addr;
6155 union sctp_addr temp;
6156 struct sctp_sock *sp = sctp_sk(sk);
6160 int bytes_copied = 0;
6164 if (len < sizeof(struct sctp_getaddrs))
6167 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6171 * For UDP-style sockets, id specifies the association to query.
6172 * If the id field is set to the value '0' then the locally bound
6173 * addresses are returned without regard to any particular
6176 if (0 == getaddrs.assoc_id) {
6177 bp = &sctp_sk(sk)->ep->base.bind_addr;
6179 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6182 bp = &asoc->base.bind_addr;
6185 to = optval + offsetof(struct sctp_getaddrs, addrs);
6186 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6188 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6192 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6193 * addresses from the global local address list.
6195 if (sctp_list_single_entry(&bp->address_list)) {
6196 addr = list_entry(bp->address_list.next,
6197 struct sctp_sockaddr_entry, list);
6198 if (sctp_is_any(sk, &addr->a)) {
6199 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6200 space_left, &bytes_copied);
6210 /* Protection on the bound address list is not needed since
6211 * in the socket option context we hold a socket lock and
6212 * thus the bound address list can't change.
6214 list_for_each_entry(addr, &bp->address_list, list) {
6215 memcpy(&temp, &addr->a, sizeof(temp));
6216 addrlen = sctp_get_pf_specific(sk->sk_family)
6217 ->addr_to_user(sp, &temp);
6218 if (space_left < addrlen) {
6219 err = -ENOMEM; /*fixme: right error?*/
6222 memcpy(buf, &temp, addrlen);
6224 bytes_copied += addrlen;
6226 space_left -= addrlen;
6230 if (copy_to_user(to, addrs, bytes_copied)) {
6234 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6238 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6239 * but we can't change it anymore.
6241 if (put_user(bytes_copied, optlen))
6248 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6250 * Requests that the local SCTP stack use the enclosed peer address as
6251 * the association primary. The enclosed address must be one of the
6252 * association peer's addresses.
6254 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6255 char __user *optval, int __user *optlen)
6257 struct sctp_prim prim;
6258 struct sctp_association *asoc;
6259 struct sctp_sock *sp = sctp_sk(sk);
6261 if (len < sizeof(struct sctp_prim))
6264 len = sizeof(struct sctp_prim);
6266 if (copy_from_user(&prim, optval, len))
6269 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6273 if (!asoc->peer.primary_path)
6276 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6277 asoc->peer.primary_path->af_specific->sockaddr_len);
6279 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6280 (union sctp_addr *)&prim.ssp_addr);
6282 if (put_user(len, optlen))
6284 if (copy_to_user(optval, &prim, len))
6291 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6293 * Requests that the local endpoint set the specified Adaptation Layer
6294 * Indication parameter for all future INIT and INIT-ACK exchanges.
6296 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6297 char __user *optval, int __user *optlen)
6299 struct sctp_setadaptation adaptation;
6301 if (len < sizeof(struct sctp_setadaptation))
6304 len = sizeof(struct sctp_setadaptation);
6306 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6308 if (put_user(len, optlen))
6310 if (copy_to_user(optval, &adaptation, len))
6318 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6320 * Applications that wish to use the sendto() system call may wish to
6321 * specify a default set of parameters that would normally be supplied
6322 * through the inclusion of ancillary data. This socket option allows
6323 * such an application to set the default sctp_sndrcvinfo structure.
6326 * The application that wishes to use this socket option simply passes
6327 * in to this call the sctp_sndrcvinfo structure defined in Section
6328 * 5.2.2) The input parameters accepted by this call include
6329 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6330 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6331 * to this call if the caller is using the UDP model.
6333 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6335 static int sctp_getsockopt_default_send_param(struct sock *sk,
6336 int len, char __user *optval,
6339 struct sctp_sock *sp = sctp_sk(sk);
6340 struct sctp_association *asoc;
6341 struct sctp_sndrcvinfo info;
6343 if (len < sizeof(info))
6348 if (copy_from_user(&info, optval, len))
6351 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6352 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6353 sctp_style(sk, UDP))
6357 info.sinfo_stream = asoc->default_stream;
6358 info.sinfo_flags = asoc->default_flags;
6359 info.sinfo_ppid = asoc->default_ppid;
6360 info.sinfo_context = asoc->default_context;
6361 info.sinfo_timetolive = asoc->default_timetolive;
6363 info.sinfo_stream = sp->default_stream;
6364 info.sinfo_flags = sp->default_flags;
6365 info.sinfo_ppid = sp->default_ppid;
6366 info.sinfo_context = sp->default_context;
6367 info.sinfo_timetolive = sp->default_timetolive;
6370 if (put_user(len, optlen))
6372 if (copy_to_user(optval, &info, len))
6378 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6379 * (SCTP_DEFAULT_SNDINFO)
6381 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6382 char __user *optval,
6385 struct sctp_sock *sp = sctp_sk(sk);
6386 struct sctp_association *asoc;
6387 struct sctp_sndinfo info;
6389 if (len < sizeof(info))
6394 if (copy_from_user(&info, optval, len))
6397 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6398 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6399 sctp_style(sk, UDP))
6403 info.snd_sid = asoc->default_stream;
6404 info.snd_flags = asoc->default_flags;
6405 info.snd_ppid = asoc->default_ppid;
6406 info.snd_context = asoc->default_context;
6408 info.snd_sid = sp->default_stream;
6409 info.snd_flags = sp->default_flags;
6410 info.snd_ppid = sp->default_ppid;
6411 info.snd_context = sp->default_context;
6414 if (put_user(len, optlen))
6416 if (copy_to_user(optval, &info, len))
6424 * 7.1.5 SCTP_NODELAY
6426 * Turn on/off any Nagle-like algorithm. This means that packets are
6427 * generally sent as soon as possible and no unnecessary delays are
6428 * introduced, at the cost of more packets in the network. Expects an
6429 * integer boolean flag.
6432 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6433 char __user *optval, int __user *optlen)
6437 if (len < sizeof(int))
6441 val = (sctp_sk(sk)->nodelay == 1);
6442 if (put_user(len, optlen))
6444 if (copy_to_user(optval, &val, len))
6451 * 7.1.1 SCTP_RTOINFO
6453 * The protocol parameters used to initialize and bound retransmission
6454 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6455 * and modify these parameters.
6456 * All parameters are time values, in milliseconds. A value of 0, when
6457 * modifying the parameters, indicates that the current value should not
6461 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6462 char __user *optval,
6463 int __user *optlen) {
6464 struct sctp_rtoinfo rtoinfo;
6465 struct sctp_association *asoc;
6467 if (len < sizeof (struct sctp_rtoinfo))
6470 len = sizeof(struct sctp_rtoinfo);
6472 if (copy_from_user(&rtoinfo, optval, len))
6475 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6477 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6478 sctp_style(sk, UDP))
6481 /* Values corresponding to the specific association. */
6483 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6484 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6485 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6487 /* Values corresponding to the endpoint. */
6488 struct sctp_sock *sp = sctp_sk(sk);
6490 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6491 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6492 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6495 if (put_user(len, optlen))
6498 if (copy_to_user(optval, &rtoinfo, len))
6506 * 7.1.2 SCTP_ASSOCINFO
6508 * This option is used to tune the maximum retransmission attempts
6509 * of the association.
6510 * Returns an error if the new association retransmission value is
6511 * greater than the sum of the retransmission value of the peer.
6512 * See [SCTP] for more information.
6515 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6516 char __user *optval,
6520 struct sctp_assocparams assocparams;
6521 struct sctp_association *asoc;
6522 struct list_head *pos;
6525 if (len < sizeof (struct sctp_assocparams))
6528 len = sizeof(struct sctp_assocparams);
6530 if (copy_from_user(&assocparams, optval, len))
6533 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6535 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6536 sctp_style(sk, UDP))
6539 /* Values correspoinding to the specific association */
6541 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6542 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6543 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6544 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6546 list_for_each(pos, &asoc->peer.transport_addr_list) {
6550 assocparams.sasoc_number_peer_destinations = cnt;
6552 /* Values corresponding to the endpoint */
6553 struct sctp_sock *sp = sctp_sk(sk);
6555 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6556 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6557 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6558 assocparams.sasoc_cookie_life =
6559 sp->assocparams.sasoc_cookie_life;
6560 assocparams.sasoc_number_peer_destinations =
6562 sasoc_number_peer_destinations;
6565 if (put_user(len, optlen))
6568 if (copy_to_user(optval, &assocparams, len))
6575 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6577 * This socket option is a boolean flag which turns on or off mapped V4
6578 * addresses. If this option is turned on and the socket is type
6579 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6580 * If this option is turned off, then no mapping will be done of V4
6581 * addresses and a user will receive both PF_INET6 and PF_INET type
6582 * addresses on the socket.
6584 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6585 char __user *optval, int __user *optlen)
6588 struct sctp_sock *sp = sctp_sk(sk);
6590 if (len < sizeof(int))
6595 if (put_user(len, optlen))
6597 if (copy_to_user(optval, &val, len))
6604 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6605 * (chapter and verse is quoted at sctp_setsockopt_context())
6607 static int sctp_getsockopt_context(struct sock *sk, int len,
6608 char __user *optval, int __user *optlen)
6610 struct sctp_assoc_value params;
6611 struct sctp_association *asoc;
6613 if (len < sizeof(struct sctp_assoc_value))
6616 len = sizeof(struct sctp_assoc_value);
6618 if (copy_from_user(¶ms, optval, len))
6621 asoc = sctp_id2assoc(sk, params.assoc_id);
6622 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6623 sctp_style(sk, UDP))
6626 params.assoc_value = asoc ? asoc->default_rcv_context
6627 : sctp_sk(sk)->default_rcv_context;
6629 if (put_user(len, optlen))
6631 if (copy_to_user(optval, ¶ms, len))
6638 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6639 * This option will get or set the maximum size to put in any outgoing
6640 * SCTP DATA chunk. If a message is larger than this size it will be
6641 * fragmented by SCTP into the specified size. Note that the underlying
6642 * SCTP implementation may fragment into smaller sized chunks when the
6643 * PMTU of the underlying association is smaller than the value set by
6644 * the user. The default value for this option is '0' which indicates
6645 * the user is NOT limiting fragmentation and only the PMTU will effect
6646 * SCTP's choice of DATA chunk size. Note also that values set larger
6647 * than the maximum size of an IP datagram will effectively let SCTP
6648 * control fragmentation (i.e. the same as setting this option to 0).
6650 * The following structure is used to access and modify this parameter:
6652 * struct sctp_assoc_value {
6653 * sctp_assoc_t assoc_id;
6654 * uint32_t assoc_value;
6657 * assoc_id: This parameter is ignored for one-to-one style sockets.
6658 * For one-to-many style sockets this parameter indicates which
6659 * association the user is performing an action upon. Note that if
6660 * this field's value is zero then the endpoints default value is
6661 * changed (effecting future associations only).
6662 * assoc_value: This parameter specifies the maximum size in bytes.
6664 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6665 char __user *optval, int __user *optlen)
6667 struct sctp_assoc_value params;
6668 struct sctp_association *asoc;
6670 if (len == sizeof(int)) {
6671 pr_warn_ratelimited(DEPRECATED
6673 "Use of int in maxseg socket option.\n"
6674 "Use struct sctp_assoc_value instead\n",
6675 current->comm, task_pid_nr(current));
6676 params.assoc_id = SCTP_FUTURE_ASSOC;
6677 } else if (len >= sizeof(struct sctp_assoc_value)) {
6678 len = sizeof(struct sctp_assoc_value);
6679 if (copy_from_user(¶ms, optval, len))
6684 asoc = sctp_id2assoc(sk, params.assoc_id);
6685 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6686 sctp_style(sk, UDP))
6690 params.assoc_value = asoc->frag_point;
6692 params.assoc_value = sctp_sk(sk)->user_frag;
6694 if (put_user(len, optlen))
6696 if (len == sizeof(int)) {
6697 if (copy_to_user(optval, ¶ms.assoc_value, len))
6700 if (copy_to_user(optval, ¶ms, len))
6708 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6709 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6711 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6712 char __user *optval, int __user *optlen)
6716 if (len < sizeof(int))
6721 val = sctp_sk(sk)->frag_interleave;
6722 if (put_user(len, optlen))
6724 if (copy_to_user(optval, &val, len))
6731 * 7.1.25. Set or Get the sctp partial delivery point
6732 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6734 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6735 char __user *optval,
6740 if (len < sizeof(u32))
6745 val = sctp_sk(sk)->pd_point;
6746 if (put_user(len, optlen))
6748 if (copy_to_user(optval, &val, len))
6755 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6756 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6758 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6759 char __user *optval,
6762 struct sctp_assoc_value params;
6763 struct sctp_association *asoc;
6765 if (len == sizeof(int)) {
6766 pr_warn_ratelimited(DEPRECATED
6768 "Use of int in max_burst socket option.\n"
6769 "Use struct sctp_assoc_value instead\n",
6770 current->comm, task_pid_nr(current));
6771 params.assoc_id = SCTP_FUTURE_ASSOC;
6772 } else if (len >= sizeof(struct sctp_assoc_value)) {
6773 len = sizeof(struct sctp_assoc_value);
6774 if (copy_from_user(¶ms, optval, len))
6779 asoc = sctp_id2assoc(sk, params.assoc_id);
6780 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6781 sctp_style(sk, UDP))
6784 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6786 if (len == sizeof(int)) {
6787 if (copy_to_user(optval, ¶ms.assoc_value, len))
6790 if (copy_to_user(optval, ¶ms, len))
6798 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6799 char __user *optval, int __user *optlen)
6801 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6802 struct sctp_hmacalgo __user *p = (void __user *)optval;
6803 struct sctp_hmac_algo_param *hmacs;
6808 if (!ep->auth_enable)
6811 hmacs = ep->auth_hmacs_list;
6812 data_len = ntohs(hmacs->param_hdr.length) -
6813 sizeof(struct sctp_paramhdr);
6815 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6818 len = sizeof(struct sctp_hmacalgo) + data_len;
6819 num_idents = data_len / sizeof(u16);
6821 if (put_user(len, optlen))
6823 if (put_user(num_idents, &p->shmac_num_idents))
6825 for (i = 0; i < num_idents; i++) {
6826 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6828 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6834 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6835 char __user *optval, int __user *optlen)
6837 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6838 struct sctp_authkeyid val;
6839 struct sctp_association *asoc;
6841 if (len < sizeof(struct sctp_authkeyid))
6844 len = sizeof(struct sctp_authkeyid);
6845 if (copy_from_user(&val, optval, len))
6848 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6849 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6853 if (!asoc->peer.auth_capable)
6855 val.scact_keynumber = asoc->active_key_id;
6857 if (!ep->auth_enable)
6859 val.scact_keynumber = ep->active_key_id;
6862 if (put_user(len, optlen))
6864 if (copy_to_user(optval, &val, len))
6870 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6871 char __user *optval, int __user *optlen)
6873 struct sctp_authchunks __user *p = (void __user *)optval;
6874 struct sctp_authchunks val;
6875 struct sctp_association *asoc;
6876 struct sctp_chunks_param *ch;
6880 if (len < sizeof(struct sctp_authchunks))
6883 if (copy_from_user(&val, optval, sizeof(val)))
6886 to = p->gauth_chunks;
6887 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6891 if (!asoc->peer.auth_capable)
6894 ch = asoc->peer.peer_chunks;
6898 /* See if the user provided enough room for all the data */
6899 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6900 if (len < num_chunks)
6903 if (copy_to_user(to, ch->chunks, num_chunks))
6906 len = sizeof(struct sctp_authchunks) + num_chunks;
6907 if (put_user(len, optlen))
6909 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6914 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6915 char __user *optval, int __user *optlen)
6917 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6918 struct sctp_authchunks __user *p = (void __user *)optval;
6919 struct sctp_authchunks val;
6920 struct sctp_association *asoc;
6921 struct sctp_chunks_param *ch;
6925 if (len < sizeof(struct sctp_authchunks))
6928 if (copy_from_user(&val, optval, sizeof(val)))
6931 to = p->gauth_chunks;
6932 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6933 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6934 sctp_style(sk, UDP))
6938 if (!asoc->peer.auth_capable)
6940 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6942 if (!ep->auth_enable)
6944 ch = ep->auth_chunk_list;
6949 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6950 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6953 if (copy_to_user(to, ch->chunks, num_chunks))
6956 len = sizeof(struct sctp_authchunks) + num_chunks;
6957 if (put_user(len, optlen))
6959 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6966 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6967 * This option gets the current number of associations that are attached
6968 * to a one-to-many style socket. The option value is an uint32_t.
6970 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6971 char __user *optval, int __user *optlen)
6973 struct sctp_sock *sp = sctp_sk(sk);
6974 struct sctp_association *asoc;
6977 if (sctp_style(sk, TCP))
6980 if (len < sizeof(u32))
6985 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6989 if (put_user(len, optlen))
6991 if (copy_to_user(optval, &val, len))
6998 * 8.1.23 SCTP_AUTO_ASCONF
6999 * See the corresponding setsockopt entry as description
7001 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7002 char __user *optval, int __user *optlen)
7006 if (len < sizeof(int))
7010 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7012 if (put_user(len, optlen))
7014 if (copy_to_user(optval, &val, len))
7020 * 8.2.6. Get the Current Identifiers of Associations
7021 * (SCTP_GET_ASSOC_ID_LIST)
7023 * This option gets the current list of SCTP association identifiers of
7024 * the SCTP associations handled by a one-to-many style socket.
7026 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7027 char __user *optval, int __user *optlen)
7029 struct sctp_sock *sp = sctp_sk(sk);
7030 struct sctp_association *asoc;
7031 struct sctp_assoc_ids *ids;
7034 if (sctp_style(sk, TCP))
7037 if (len < sizeof(struct sctp_assoc_ids))
7040 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7044 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7047 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7049 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7053 ids->gaids_number_of_ids = num;
7055 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7056 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7059 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7069 * SCTP_PEER_ADDR_THLDS
7071 * This option allows us to fetch the partially failed threshold for one or all
7072 * transports in an association. See Section 6.1 of:
7073 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7075 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7076 char __user *optval, int len,
7077 int __user *optlen, bool v2)
7079 struct sctp_paddrthlds_v2 val;
7080 struct sctp_transport *trans;
7081 struct sctp_association *asoc;
7084 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7088 if (copy_from_user(&val, optval, len))
7091 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7092 trans = sctp_addr_id2transport(sk, &val.spt_address,
7097 val.spt_pathmaxrxt = trans->pathmaxrxt;
7098 val.spt_pathpfthld = trans->pf_retrans;
7099 val.spt_pathcpthld = trans->ps_retrans;
7104 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7105 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7106 sctp_style(sk, UDP))
7110 val.spt_pathpfthld = asoc->pf_retrans;
7111 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7112 val.spt_pathcpthld = asoc->ps_retrans;
7114 struct sctp_sock *sp = sctp_sk(sk);
7116 val.spt_pathpfthld = sp->pf_retrans;
7117 val.spt_pathmaxrxt = sp->pathmaxrxt;
7118 val.spt_pathcpthld = sp->ps_retrans;
7122 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7129 * SCTP_GET_ASSOC_STATS
7131 * This option retrieves local per endpoint statistics. It is modeled
7132 * after OpenSolaris' implementation
7134 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7135 char __user *optval,
7138 struct sctp_assoc_stats sas;
7139 struct sctp_association *asoc = NULL;
7141 /* User must provide at least the assoc id */
7142 if (len < sizeof(sctp_assoc_t))
7145 /* Allow the struct to grow and fill in as much as possible */
7146 len = min_t(size_t, len, sizeof(sas));
7148 if (copy_from_user(&sas, optval, len))
7151 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7155 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7156 sas.sas_gapcnt = asoc->stats.gapcnt;
7157 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7158 sas.sas_osacks = asoc->stats.osacks;
7159 sas.sas_isacks = asoc->stats.isacks;
7160 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7161 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7162 sas.sas_oodchunks = asoc->stats.oodchunks;
7163 sas.sas_iodchunks = asoc->stats.iodchunks;
7164 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7165 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7166 sas.sas_idupchunks = asoc->stats.idupchunks;
7167 sas.sas_opackets = asoc->stats.opackets;
7168 sas.sas_ipackets = asoc->stats.ipackets;
7170 /* New high max rto observed, will return 0 if not a single
7171 * RTO update took place. obs_rto_ipaddr will be bogus
7174 sas.sas_maxrto = asoc->stats.max_obs_rto;
7175 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7176 sizeof(struct sockaddr_storage));
7178 /* Mark beginning of a new observation period */
7179 asoc->stats.max_obs_rto = asoc->rto_min;
7181 if (put_user(len, optlen))
7184 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7186 if (copy_to_user(optval, &sas, len))
7192 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7193 char __user *optval,
7198 if (len < sizeof(int))
7202 if (sctp_sk(sk)->recvrcvinfo)
7204 if (put_user(len, optlen))
7206 if (copy_to_user(optval, &val, len))
7212 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7213 char __user *optval,
7218 if (len < sizeof(int))
7222 if (sctp_sk(sk)->recvnxtinfo)
7224 if (put_user(len, optlen))
7226 if (copy_to_user(optval, &val, len))
7232 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7233 char __user *optval,
7236 struct sctp_assoc_value params;
7237 struct sctp_association *asoc;
7238 int retval = -EFAULT;
7240 if (len < sizeof(params)) {
7245 len = sizeof(params);
7246 if (copy_from_user(¶ms, optval, len))
7249 asoc = sctp_id2assoc(sk, params.assoc_id);
7250 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7251 sctp_style(sk, UDP)) {
7256 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7257 : sctp_sk(sk)->ep->prsctp_enable;
7259 if (put_user(len, optlen))
7262 if (copy_to_user(optval, ¶ms, len))
7271 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7272 char __user *optval,
7275 struct sctp_default_prinfo info;
7276 struct sctp_association *asoc;
7277 int retval = -EFAULT;
7279 if (len < sizeof(info)) {
7285 if (copy_from_user(&info, optval, len))
7288 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7289 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7290 sctp_style(sk, UDP)) {
7296 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7297 info.pr_value = asoc->default_timetolive;
7299 struct sctp_sock *sp = sctp_sk(sk);
7301 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7302 info.pr_value = sp->default_timetolive;
7305 if (put_user(len, optlen))
7308 if (copy_to_user(optval, &info, len))
7317 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7318 char __user *optval,
7321 struct sctp_prstatus params;
7322 struct sctp_association *asoc;
7324 int retval = -EINVAL;
7326 if (len < sizeof(params))
7329 len = sizeof(params);
7330 if (copy_from_user(¶ms, optval, len)) {
7335 policy = params.sprstat_policy;
7336 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7337 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7340 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7344 if (policy == SCTP_PR_SCTP_ALL) {
7345 params.sprstat_abandoned_unsent = 0;
7346 params.sprstat_abandoned_sent = 0;
7347 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7348 params.sprstat_abandoned_unsent +=
7349 asoc->abandoned_unsent[policy];
7350 params.sprstat_abandoned_sent +=
7351 asoc->abandoned_sent[policy];
7354 params.sprstat_abandoned_unsent =
7355 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7356 params.sprstat_abandoned_sent =
7357 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7360 if (put_user(len, optlen)) {
7365 if (copy_to_user(optval, ¶ms, len)) {
7376 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7377 char __user *optval,
7380 struct sctp_stream_out_ext *streamoute;
7381 struct sctp_association *asoc;
7382 struct sctp_prstatus params;
7383 int retval = -EINVAL;
7386 if (len < sizeof(params))
7389 len = sizeof(params);
7390 if (copy_from_user(¶ms, optval, len)) {
7395 policy = params.sprstat_policy;
7396 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7397 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7400 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7401 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7404 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7406 /* Not allocated yet, means all stats are 0 */
7407 params.sprstat_abandoned_unsent = 0;
7408 params.sprstat_abandoned_sent = 0;
7413 if (policy == SCTP_PR_SCTP_ALL) {
7414 params.sprstat_abandoned_unsent = 0;
7415 params.sprstat_abandoned_sent = 0;
7416 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7417 params.sprstat_abandoned_unsent +=
7418 streamoute->abandoned_unsent[policy];
7419 params.sprstat_abandoned_sent +=
7420 streamoute->abandoned_sent[policy];
7423 params.sprstat_abandoned_unsent =
7424 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7425 params.sprstat_abandoned_sent =
7426 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7429 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7440 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7441 char __user *optval,
7444 struct sctp_assoc_value params;
7445 struct sctp_association *asoc;
7446 int retval = -EFAULT;
7448 if (len < sizeof(params)) {
7453 len = sizeof(params);
7454 if (copy_from_user(¶ms, optval, len))
7457 asoc = sctp_id2assoc(sk, params.assoc_id);
7458 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7459 sctp_style(sk, UDP)) {
7464 params.assoc_value = asoc ? asoc->peer.reconf_capable
7465 : sctp_sk(sk)->ep->reconf_enable;
7467 if (put_user(len, optlen))
7470 if (copy_to_user(optval, ¶ms, len))
7479 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7480 char __user *optval,
7483 struct sctp_assoc_value params;
7484 struct sctp_association *asoc;
7485 int retval = -EFAULT;
7487 if (len < sizeof(params)) {
7492 len = sizeof(params);
7493 if (copy_from_user(¶ms, optval, len))
7496 asoc = sctp_id2assoc(sk, params.assoc_id);
7497 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7498 sctp_style(sk, UDP)) {
7503 params.assoc_value = asoc ? asoc->strreset_enable
7504 : sctp_sk(sk)->ep->strreset_enable;
7506 if (put_user(len, optlen))
7509 if (copy_to_user(optval, ¶ms, len))
7518 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7519 char __user *optval,
7522 struct sctp_assoc_value params;
7523 struct sctp_association *asoc;
7524 int retval = -EFAULT;
7526 if (len < sizeof(params)) {
7531 len = sizeof(params);
7532 if (copy_from_user(¶ms, optval, len))
7535 asoc = sctp_id2assoc(sk, params.assoc_id);
7536 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7537 sctp_style(sk, UDP)) {
7542 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7543 : sctp_sk(sk)->default_ss;
7545 if (put_user(len, optlen))
7548 if (copy_to_user(optval, ¶ms, len))
7557 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7558 char __user *optval,
7561 struct sctp_stream_value params;
7562 struct sctp_association *asoc;
7563 int retval = -EFAULT;
7565 if (len < sizeof(params)) {
7570 len = sizeof(params);
7571 if (copy_from_user(¶ms, optval, len))
7574 asoc = sctp_id2assoc(sk, params.assoc_id);
7580 retval = sctp_sched_get_value(asoc, params.stream_id,
7581 ¶ms.stream_value);
7585 if (put_user(len, optlen)) {
7590 if (copy_to_user(optval, ¶ms, len)) {
7599 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7600 char __user *optval,
7603 struct sctp_assoc_value params;
7604 struct sctp_association *asoc;
7605 int retval = -EFAULT;
7607 if (len < sizeof(params)) {
7612 len = sizeof(params);
7613 if (copy_from_user(¶ms, optval, len))
7616 asoc = sctp_id2assoc(sk, params.assoc_id);
7617 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7618 sctp_style(sk, UDP)) {
7623 params.assoc_value = asoc ? asoc->peer.intl_capable
7624 : sctp_sk(sk)->ep->intl_enable;
7626 if (put_user(len, optlen))
7629 if (copy_to_user(optval, ¶ms, len))
7638 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7639 char __user *optval,
7644 if (len < sizeof(int))
7648 val = sctp_sk(sk)->reuse;
7649 if (put_user(len, optlen))
7652 if (copy_to_user(optval, &val, len))
7658 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7661 struct sctp_association *asoc;
7662 struct sctp_event param;
7665 if (len < sizeof(param))
7668 len = sizeof(param);
7669 if (copy_from_user(¶m, optval, len))
7672 if (param.se_type < SCTP_SN_TYPE_BASE ||
7673 param.se_type > SCTP_SN_TYPE_MAX)
7676 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7677 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7678 sctp_style(sk, UDP))
7681 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7682 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7684 if (put_user(len, optlen))
7687 if (copy_to_user(optval, ¶m, len))
7693 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7694 char __user *optval,
7697 struct sctp_assoc_value params;
7698 struct sctp_association *asoc;
7699 int retval = -EFAULT;
7701 if (len < sizeof(params)) {
7706 len = sizeof(params);
7707 if (copy_from_user(¶ms, optval, len))
7710 asoc = sctp_id2assoc(sk, params.assoc_id);
7711 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7712 sctp_style(sk, UDP)) {
7717 params.assoc_value = asoc ? asoc->peer.asconf_capable
7718 : sctp_sk(sk)->ep->asconf_enable;
7720 if (put_user(len, optlen))
7723 if (copy_to_user(optval, ¶ms, len))
7732 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7733 char __user *optval,
7736 struct sctp_assoc_value params;
7737 struct sctp_association *asoc;
7738 int retval = -EFAULT;
7740 if (len < sizeof(params)) {
7745 len = sizeof(params);
7746 if (copy_from_user(¶ms, optval, len))
7749 asoc = sctp_id2assoc(sk, params.assoc_id);
7750 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7751 sctp_style(sk, UDP)) {
7756 params.assoc_value = asoc ? asoc->peer.auth_capable
7757 : sctp_sk(sk)->ep->auth_enable;
7759 if (put_user(len, optlen))
7762 if (copy_to_user(optval, ¶ms, len))
7771 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7772 char __user *optval,
7775 struct sctp_assoc_value params;
7776 struct sctp_association *asoc;
7777 int retval = -EFAULT;
7779 if (len < sizeof(params)) {
7784 len = sizeof(params);
7785 if (copy_from_user(¶ms, optval, len))
7788 asoc = sctp_id2assoc(sk, params.assoc_id);
7789 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7790 sctp_style(sk, UDP)) {
7795 params.assoc_value = asoc ? asoc->peer.ecn_capable
7796 : sctp_sk(sk)->ep->ecn_enable;
7798 if (put_user(len, optlen))
7801 if (copy_to_user(optval, ¶ms, len))
7810 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7811 char __user *optval,
7814 struct sctp_assoc_value params;
7815 struct sctp_association *asoc;
7816 int retval = -EFAULT;
7818 if (len < sizeof(params)) {
7823 len = sizeof(params);
7824 if (copy_from_user(¶ms, optval, len))
7827 asoc = sctp_id2assoc(sk, params.assoc_id);
7828 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7829 sctp_style(sk, UDP)) {
7834 params.assoc_value = asoc ? asoc->pf_expose
7835 : sctp_sk(sk)->pf_expose;
7837 if (put_user(len, optlen))
7840 if (copy_to_user(optval, ¶ms, len))
7849 static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7850 char __user *optval, int __user *optlen)
7852 struct sctp_association *asoc;
7853 struct sctp_udpencaps encap;
7854 struct sctp_transport *t;
7857 if (len < sizeof(encap))
7860 len = sizeof(encap);
7861 if (copy_from_user(&encap, optval, len))
7864 /* If an address other than INADDR_ANY is specified, and
7865 * no transport is found, then the request is invalid.
7867 if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7868 t = sctp_addr_id2transport(sk, &encap.sue_address,
7869 encap.sue_assoc_id);
7871 pr_debug("%s: failed no transport\n", __func__);
7875 encap_port = t->encap_port;
7879 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7880 * socket is a one to many style socket, and an association
7881 * was not found, then the id was invalid.
7883 asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7884 if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7885 sctp_style(sk, UDP)) {
7886 pr_debug("%s: failed no association\n", __func__);
7891 encap_port = asoc->encap_port;
7895 encap_port = sctp_sk(sk)->encap_port;
7898 encap.sue_port = (__force uint16_t)encap_port;
7899 if (copy_to_user(optval, &encap, len))
7902 if (put_user(len, optlen))
7908 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7909 char __user *optval, int __user *optlen)
7914 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7916 /* I can hardly begin to describe how wrong this is. This is
7917 * so broken as to be worse than useless. The API draft
7918 * REALLY is NOT helpful here... I am not convinced that the
7919 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7920 * are at all well-founded.
7922 if (level != SOL_SCTP) {
7923 struct sctp_af *af = sctp_sk(sk)->pf->af;
7925 retval = af->getsockopt(sk, level, optname, optval, optlen);
7929 if (get_user(len, optlen))
7939 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7941 case SCTP_DISABLE_FRAGMENTS:
7942 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7946 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7948 case SCTP_AUTOCLOSE:
7949 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7951 case SCTP_SOCKOPT_PEELOFF:
7952 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7954 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7955 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7957 case SCTP_PEER_ADDR_PARAMS:
7958 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7961 case SCTP_DELAYED_SACK:
7962 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7966 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7968 case SCTP_GET_PEER_ADDRS:
7969 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7972 case SCTP_GET_LOCAL_ADDRS:
7973 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7976 case SCTP_SOCKOPT_CONNECTX3:
7977 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7979 case SCTP_DEFAULT_SEND_PARAM:
7980 retval = sctp_getsockopt_default_send_param(sk, len,
7983 case SCTP_DEFAULT_SNDINFO:
7984 retval = sctp_getsockopt_default_sndinfo(sk, len,
7987 case SCTP_PRIMARY_ADDR:
7988 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7991 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7994 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7996 case SCTP_ASSOCINFO:
7997 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7999 case SCTP_I_WANT_MAPPED_V4_ADDR:
8000 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8003 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8005 case SCTP_GET_PEER_ADDR_INFO:
8006 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8009 case SCTP_ADAPTATION_LAYER:
8010 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8014 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8016 case SCTP_FRAGMENT_INTERLEAVE:
8017 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8020 case SCTP_PARTIAL_DELIVERY_POINT:
8021 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8024 case SCTP_MAX_BURST:
8025 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8028 case SCTP_AUTH_CHUNK:
8029 case SCTP_AUTH_DELETE_KEY:
8030 case SCTP_AUTH_DEACTIVATE_KEY:
8031 retval = -EOPNOTSUPP;
8033 case SCTP_HMAC_IDENT:
8034 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8036 case SCTP_AUTH_ACTIVE_KEY:
8037 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8039 case SCTP_PEER_AUTH_CHUNKS:
8040 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8043 case SCTP_LOCAL_AUTH_CHUNKS:
8044 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8047 case SCTP_GET_ASSOC_NUMBER:
8048 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8050 case SCTP_GET_ASSOC_ID_LIST:
8051 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8053 case SCTP_AUTO_ASCONF:
8054 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8056 case SCTP_PEER_ADDR_THLDS:
8057 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8060 case SCTP_PEER_ADDR_THLDS_V2:
8061 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8064 case SCTP_GET_ASSOC_STATS:
8065 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8067 case SCTP_RECVRCVINFO:
8068 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8070 case SCTP_RECVNXTINFO:
8071 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8073 case SCTP_PR_SUPPORTED:
8074 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8076 case SCTP_DEFAULT_PRINFO:
8077 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8080 case SCTP_PR_ASSOC_STATUS:
8081 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8084 case SCTP_PR_STREAM_STATUS:
8085 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8088 case SCTP_RECONFIG_SUPPORTED:
8089 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8092 case SCTP_ENABLE_STREAM_RESET:
8093 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8096 case SCTP_STREAM_SCHEDULER:
8097 retval = sctp_getsockopt_scheduler(sk, len, optval,
8100 case SCTP_STREAM_SCHEDULER_VALUE:
8101 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8104 case SCTP_INTERLEAVING_SUPPORTED:
8105 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8108 case SCTP_REUSE_PORT:
8109 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8112 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8114 case SCTP_ASCONF_SUPPORTED:
8115 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8118 case SCTP_AUTH_SUPPORTED:
8119 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8122 case SCTP_ECN_SUPPORTED:
8123 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8125 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8126 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8128 case SCTP_REMOTE_UDP_ENCAPS_PORT:
8129 retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8132 retval = -ENOPROTOOPT;
8140 static int sctp_hash(struct sock *sk)
8146 static void sctp_unhash(struct sock *sk)
8151 /* Check if port is acceptable. Possibly find first available port.
8153 * The port hash table (contained in the 'global' SCTP protocol storage
8154 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8155 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8156 * list (the list number is the port number hashed out, so as you
8157 * would expect from a hash function, all the ports in a given list have
8158 * such a number that hashes out to the same list number; you were
8159 * expecting that, right?); so each list has a set of ports, with a
8160 * link to the socket (struct sock) that uses it, the port number and
8161 * a fastreuse flag (FIXME: NPI ipg).
8163 static struct sctp_bind_bucket *sctp_bucket_create(
8164 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8166 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8168 struct sctp_sock *sp = sctp_sk(sk);
8169 bool reuse = (sk->sk_reuse || sp->reuse);
8170 struct sctp_bind_hashbucket *head; /* hash list */
8171 struct net *net = sock_net(sk);
8172 kuid_t uid = sock_i_uid(sk);
8173 struct sctp_bind_bucket *pp;
8174 unsigned short snum;
8177 snum = ntohs(addr->v4.sin_port);
8179 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8182 /* Search for an available port. */
8183 int low, high, remaining, index;
8186 inet_get_local_port_range(net, &low, &high);
8187 remaining = (high - low) + 1;
8188 rover = prandom_u32() % remaining + low;
8192 if ((rover < low) || (rover > high))
8194 if (inet_is_local_reserved_port(net, rover))
8196 index = sctp_phashfn(net, rover);
8197 head = &sctp_port_hashtable[index];
8198 spin_lock_bh(&head->lock);
8199 sctp_for_each_hentry(pp, &head->chain)
8200 if ((pp->port == rover) &&
8201 net_eq(net, pp->net))
8205 spin_unlock_bh(&head->lock);
8207 } while (--remaining > 0);
8209 /* Exhausted local port range during search? */
8214 /* OK, here is the one we will use. HEAD (the port
8215 * hash table list entry) is non-NULL and we hold it's
8220 /* We are given an specific port number; we verify
8221 * that it is not being used. If it is used, we will
8222 * exahust the search in the hash list corresponding
8223 * to the port number (snum) - we detect that with the
8224 * port iterator, pp being NULL.
8226 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8227 spin_lock_bh(&head->lock);
8228 sctp_for_each_hentry(pp, &head->chain) {
8229 if ((pp->port == snum) && net_eq(pp->net, net))
8236 if (!hlist_empty(&pp->owner)) {
8237 /* We had a port hash table hit - there is an
8238 * available port (pp != NULL) and it is being
8239 * used by other socket (pp->owner not empty); that other
8240 * socket is going to be sk2.
8244 pr_debug("%s: found a possible match\n", __func__);
8246 if ((pp->fastreuse && reuse &&
8247 sk->sk_state != SCTP_SS_LISTENING) ||
8248 (pp->fastreuseport && sk->sk_reuseport &&
8249 uid_eq(pp->fastuid, uid)))
8252 /* Run through the list of sockets bound to the port
8253 * (pp->port) [via the pointers bind_next and
8254 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8255 * we get the endpoint they describe and run through
8256 * the endpoint's list of IP (v4 or v6) addresses,
8257 * comparing each of the addresses with the address of
8258 * the socket sk. If we find a match, then that means
8259 * that this port/socket (sk) combination are already
8262 sk_for_each_bound(sk2, &pp->owner) {
8263 struct sctp_sock *sp2 = sctp_sk(sk2);
8264 struct sctp_endpoint *ep2 = sp2->ep;
8267 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8268 sk2->sk_state != SCTP_SS_LISTENING) ||
8269 (sk->sk_reuseport && sk2->sk_reuseport &&
8270 uid_eq(uid, sock_i_uid(sk2))))
8273 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8280 pr_debug("%s: found a match\n", __func__);
8283 /* If there was a hash table miss, create a new port. */
8285 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8288 /* In either case (hit or miss), make sure fastreuse is 1 only
8289 * if sk->sk_reuse is too (that is, if the caller requested
8290 * SO_REUSEADDR on this socket -sk-).
8292 if (hlist_empty(&pp->owner)) {
8293 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8298 if (sk->sk_reuseport) {
8299 pp->fastreuseport = 1;
8302 pp->fastreuseport = 0;
8305 if (pp->fastreuse &&
8306 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8309 if (pp->fastreuseport &&
8310 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8311 pp->fastreuseport = 0;
8314 /* We are set, so fill up all the data in the hash table
8315 * entry, tie the socket list information with the rest of the
8316 * sockets FIXME: Blurry, NPI (ipg).
8319 if (!sp->bind_hash) {
8320 inet_sk(sk)->inet_num = snum;
8321 sk_add_bind_node(sk, &pp->owner);
8327 spin_unlock_bh(&head->lock);
8331 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8332 * port is requested.
8334 static int sctp_get_port(struct sock *sk, unsigned short snum)
8336 union sctp_addr addr;
8337 struct sctp_af *af = sctp_sk(sk)->pf->af;
8339 /* Set up a dummy address struct from the sk. */
8340 af->from_sk(&addr, sk);
8341 addr.v4.sin_port = htons(snum);
8343 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8344 return sctp_get_port_local(sk, &addr);
8348 * Move a socket to LISTENING state.
8350 static int sctp_listen_start(struct sock *sk, int backlog)
8352 struct sctp_sock *sp = sctp_sk(sk);
8353 struct sctp_endpoint *ep = sp->ep;
8354 struct crypto_shash *tfm = NULL;
8357 /* Allocate HMAC for generating cookie. */
8358 if (!sp->hmac && sp->sctp_hmac_alg) {
8359 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8360 tfm = crypto_alloc_shash(alg, 0, 0);
8362 net_info_ratelimited("failed to load transform for %s: %ld\n",
8363 sp->sctp_hmac_alg, PTR_ERR(tfm));
8366 sctp_sk(sk)->hmac = tfm;
8370 * If a bind() or sctp_bindx() is not called prior to a listen()
8371 * call that allows new associations to be accepted, the system
8372 * picks an ephemeral port and will choose an address set equivalent
8373 * to binding with a wildcard address.
8375 * This is not currently spelled out in the SCTP sockets
8376 * extensions draft, but follows the practice as seen in TCP
8380 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8381 if (!ep->base.bind_addr.port) {
8382 if (sctp_autobind(sk))
8385 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8386 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8391 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8392 return sctp_hash_endpoint(ep);
8396 * 4.1.3 / 5.1.3 listen()
8398 * By default, new associations are not accepted for UDP style sockets.
8399 * An application uses listen() to mark a socket as being able to
8400 * accept new associations.
8402 * On TCP style sockets, applications use listen() to ready the SCTP
8403 * endpoint for accepting inbound associations.
8405 * On both types of endpoints a backlog of '0' disables listening.
8407 * Move a socket to LISTENING state.
8409 int sctp_inet_listen(struct socket *sock, int backlog)
8411 struct sock *sk = sock->sk;
8412 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8415 if (unlikely(backlog < 0))
8420 /* Peeled-off sockets are not allowed to listen(). */
8421 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8424 if (sock->state != SS_UNCONNECTED)
8427 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8430 /* If backlog is zero, disable listening. */
8432 if (sctp_sstate(sk, CLOSED))
8436 sctp_unhash_endpoint(ep);
8437 sk->sk_state = SCTP_SS_CLOSED;
8438 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8439 sctp_sk(sk)->bind_hash->fastreuse = 1;
8443 /* If we are already listening, just update the backlog */
8444 if (sctp_sstate(sk, LISTENING))
8445 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8447 err = sctp_listen_start(sk, backlog);
8459 * This function is done by modeling the current datagram_poll() and the
8460 * tcp_poll(). Note that, based on these implementations, we don't
8461 * lock the socket in this function, even though it seems that,
8462 * ideally, locking or some other mechanisms can be used to ensure
8463 * the integrity of the counters (sndbuf and wmem_alloc) used
8464 * in this place. We assume that we don't need locks either until proven
8467 * Another thing to note is that we include the Async I/O support
8468 * here, again, by modeling the current TCP/UDP code. We don't have
8469 * a good way to test with it yet.
8471 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8473 struct sock *sk = sock->sk;
8474 struct sctp_sock *sp = sctp_sk(sk);
8477 poll_wait(file, sk_sleep(sk), wait);
8479 sock_rps_record_flow(sk);
8481 /* A TCP-style listening socket becomes readable when the accept queue
8484 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8485 return (!list_empty(&sp->ep->asocs)) ?
8486 (EPOLLIN | EPOLLRDNORM) : 0;
8490 /* Is there any exceptional events? */
8491 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8493 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8494 if (sk->sk_shutdown & RCV_SHUTDOWN)
8495 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8496 if (sk->sk_shutdown == SHUTDOWN_MASK)
8499 /* Is it readable? Reconsider this code with TCP-style support. */
8500 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8501 mask |= EPOLLIN | EPOLLRDNORM;
8503 /* The association is either gone or not ready. */
8504 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8507 /* Is it writable? */
8508 if (sctp_writeable(sk)) {
8509 mask |= EPOLLOUT | EPOLLWRNORM;
8511 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8513 * Since the socket is not locked, the buffer
8514 * might be made available after the writeable check and
8515 * before the bit is set. This could cause a lost I/O
8516 * signal. tcp_poll() has a race breaker for this race
8517 * condition. Based on their implementation, we put
8518 * in the following code to cover it as well.
8520 if (sctp_writeable(sk))
8521 mask |= EPOLLOUT | EPOLLWRNORM;
8526 /********************************************************************
8527 * 2nd Level Abstractions
8528 ********************************************************************/
8530 static struct sctp_bind_bucket *sctp_bucket_create(
8531 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8533 struct sctp_bind_bucket *pp;
8535 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8537 SCTP_DBG_OBJCNT_INC(bind_bucket);
8540 INIT_HLIST_HEAD(&pp->owner);
8542 hlist_add_head(&pp->node, &head->chain);
8547 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8548 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8550 if (pp && hlist_empty(&pp->owner)) {
8551 __hlist_del(&pp->node);
8552 kmem_cache_free(sctp_bucket_cachep, pp);
8553 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8557 /* Release this socket's reference to a local port. */
8558 static inline void __sctp_put_port(struct sock *sk)
8560 struct sctp_bind_hashbucket *head =
8561 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8562 inet_sk(sk)->inet_num)];
8563 struct sctp_bind_bucket *pp;
8565 spin_lock(&head->lock);
8566 pp = sctp_sk(sk)->bind_hash;
8567 __sk_del_bind_node(sk);
8568 sctp_sk(sk)->bind_hash = NULL;
8569 inet_sk(sk)->inet_num = 0;
8570 sctp_bucket_destroy(pp);
8571 spin_unlock(&head->lock);
8574 void sctp_put_port(struct sock *sk)
8577 __sctp_put_port(sk);
8582 * The system picks an ephemeral port and choose an address set equivalent
8583 * to binding with a wildcard address.
8584 * One of those addresses will be the primary address for the association.
8585 * This automatically enables the multihoming capability of SCTP.
8587 static int sctp_autobind(struct sock *sk)
8589 union sctp_addr autoaddr;
8593 /* Initialize a local sockaddr structure to INADDR_ANY. */
8594 af = sctp_sk(sk)->pf->af;
8596 port = htons(inet_sk(sk)->inet_num);
8597 af->inaddr_any(&autoaddr, port);
8599 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8602 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8605 * 4.2 The cmsghdr Structure *
8607 * When ancillary data is sent or received, any number of ancillary data
8608 * objects can be specified by the msg_control and msg_controllen members of
8609 * the msghdr structure, because each object is preceded by
8610 * a cmsghdr structure defining the object's length (the cmsg_len member).
8611 * Historically Berkeley-derived implementations have passed only one object
8612 * at a time, but this API allows multiple objects to be
8613 * passed in a single call to sendmsg() or recvmsg(). The following example
8614 * shows two ancillary data objects in a control buffer.
8616 * |<--------------------------- msg_controllen -------------------------->|
8619 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8621 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8624 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8626 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8629 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8630 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8632 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8634 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8641 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8643 struct msghdr *my_msg = (struct msghdr *)msg;
8644 struct cmsghdr *cmsg;
8646 for_each_cmsghdr(cmsg, my_msg) {
8647 if (!CMSG_OK(my_msg, cmsg))
8650 /* Should we parse this header or ignore? */
8651 if (cmsg->cmsg_level != IPPROTO_SCTP)
8654 /* Strictly check lengths following example in SCM code. */
8655 switch (cmsg->cmsg_type) {
8657 /* SCTP Socket API Extension
8658 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8660 * This cmsghdr structure provides information for
8661 * initializing new SCTP associations with sendmsg().
8662 * The SCTP_INITMSG socket option uses this same data
8663 * structure. This structure is not used for
8666 * cmsg_level cmsg_type cmsg_data[]
8667 * ------------ ------------ ----------------------
8668 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8670 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8673 cmsgs->init = CMSG_DATA(cmsg);
8677 /* SCTP Socket API Extension
8678 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8680 * This cmsghdr structure specifies SCTP options for
8681 * sendmsg() and describes SCTP header information
8682 * about a received message through recvmsg().
8684 * cmsg_level cmsg_type cmsg_data[]
8685 * ------------ ------------ ----------------------
8686 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8688 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8691 cmsgs->srinfo = CMSG_DATA(cmsg);
8693 if (cmsgs->srinfo->sinfo_flags &
8694 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8695 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8696 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8701 /* SCTP Socket API Extension
8702 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8704 * This cmsghdr structure specifies SCTP options for
8705 * sendmsg(). This structure and SCTP_RCVINFO replaces
8706 * SCTP_SNDRCV which has been deprecated.
8708 * cmsg_level cmsg_type cmsg_data[]
8709 * ------------ ------------ ---------------------
8710 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8712 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8715 cmsgs->sinfo = CMSG_DATA(cmsg);
8717 if (cmsgs->sinfo->snd_flags &
8718 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8719 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8720 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8724 /* SCTP Socket API Extension
8725 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8727 * This cmsghdr structure specifies SCTP options for sendmsg().
8729 * cmsg_level cmsg_type cmsg_data[]
8730 * ------------ ------------ ---------------------
8731 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8733 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8736 cmsgs->prinfo = CMSG_DATA(cmsg);
8737 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8740 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8741 cmsgs->prinfo->pr_value = 0;
8744 /* SCTP Socket API Extension
8745 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8747 * This cmsghdr structure specifies SCTP options for sendmsg().
8749 * cmsg_level cmsg_type cmsg_data[]
8750 * ------------ ------------ ---------------------
8751 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8753 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8756 cmsgs->authinfo = CMSG_DATA(cmsg);
8758 case SCTP_DSTADDRV4:
8759 case SCTP_DSTADDRV6:
8760 /* SCTP Socket API Extension
8761 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8763 * This cmsghdr structure specifies SCTP options for sendmsg().
8765 * cmsg_level cmsg_type cmsg_data[]
8766 * ------------ ------------ ---------------------
8767 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8768 * ------------ ------------ ---------------------
8769 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8771 cmsgs->addrs_msg = my_msg;
8782 * Wait for a packet..
8783 * Note: This function is the same function as in core/datagram.c
8784 * with a few modifications to make lksctp work.
8786 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8791 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8793 /* Socket errors? */
8794 error = sock_error(sk);
8798 if (!skb_queue_empty(&sk->sk_receive_queue))
8801 /* Socket shut down? */
8802 if (sk->sk_shutdown & RCV_SHUTDOWN)
8805 /* Sequenced packets can come disconnected. If so we report the
8810 /* Is there a good reason to think that we may receive some data? */
8811 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8814 /* Handle signals. */
8815 if (signal_pending(current))
8818 /* Let another process have a go. Since we are going to sleep
8819 * anyway. Note: This may cause odd behaviors if the message
8820 * does not fit in the user's buffer, but this seems to be the
8821 * only way to honor MSG_DONTWAIT realistically.
8824 *timeo_p = schedule_timeout(*timeo_p);
8828 finish_wait(sk_sleep(sk), &wait);
8832 error = sock_intr_errno(*timeo_p);
8835 finish_wait(sk_sleep(sk), &wait);
8840 /* Receive a datagram.
8841 * Note: This is pretty much the same routine as in core/datagram.c
8842 * with a few changes to make lksctp work.
8844 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8845 int noblock, int *err)
8848 struct sk_buff *skb;
8851 timeo = sock_rcvtimeo(sk, noblock);
8853 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8854 MAX_SCHEDULE_TIMEOUT);
8857 /* Again only user level code calls this function,
8858 * so nothing interrupt level
8859 * will suddenly eat the receive_queue.
8861 * Look at current nfs client by the way...
8862 * However, this function was correct in any case. 8)
8864 if (flags & MSG_PEEK) {
8865 skb = skb_peek(&sk->sk_receive_queue);
8867 refcount_inc(&skb->users);
8869 skb = __skb_dequeue(&sk->sk_receive_queue);
8875 /* Caller is allowed not to check sk->sk_err before calling. */
8876 error = sock_error(sk);
8880 if (sk->sk_shutdown & RCV_SHUTDOWN)
8883 if (sk_can_busy_loop(sk)) {
8884 sk_busy_loop(sk, noblock);
8886 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8890 /* User doesn't want to wait. */
8894 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8903 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8904 static void __sctp_write_space(struct sctp_association *asoc)
8906 struct sock *sk = asoc->base.sk;
8908 if (sctp_wspace(asoc) <= 0)
8911 if (waitqueue_active(&asoc->wait))
8912 wake_up_interruptible(&asoc->wait);
8914 if (sctp_writeable(sk)) {
8915 struct socket_wq *wq;
8918 wq = rcu_dereference(sk->sk_wq);
8920 if (waitqueue_active(&wq->wait))
8921 wake_up_interruptible(&wq->wait);
8923 /* Note that we try to include the Async I/O support
8924 * here by modeling from the current TCP/UDP code.
8925 * We have not tested with it yet.
8927 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8928 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8934 static void sctp_wake_up_waiters(struct sock *sk,
8935 struct sctp_association *asoc)
8937 struct sctp_association *tmp = asoc;
8939 /* We do accounting for the sndbuf space per association,
8940 * so we only need to wake our own association.
8942 if (asoc->ep->sndbuf_policy)
8943 return __sctp_write_space(asoc);
8945 /* If association goes down and is just flushing its
8946 * outq, then just normally notify others.
8948 if (asoc->base.dead)
8949 return sctp_write_space(sk);
8951 /* Accounting for the sndbuf space is per socket, so we
8952 * need to wake up others, try to be fair and in case of
8953 * other associations, let them have a go first instead
8954 * of just doing a sctp_write_space() call.
8956 * Note that we reach sctp_wake_up_waiters() only when
8957 * associations free up queued chunks, thus we are under
8958 * lock and the list of associations on a socket is
8959 * guaranteed not to change.
8961 for (tmp = list_next_entry(tmp, asocs); 1;
8962 tmp = list_next_entry(tmp, asocs)) {
8963 /* Manually skip the head element. */
8964 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8966 /* Wake up association. */
8967 __sctp_write_space(tmp);
8968 /* We've reached the end. */
8974 /* Do accounting for the sndbuf space.
8975 * Decrement the used sndbuf space of the corresponding association by the
8976 * data size which was just transmitted(freed).
8978 static void sctp_wfree(struct sk_buff *skb)
8980 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8981 struct sctp_association *asoc = chunk->asoc;
8982 struct sock *sk = asoc->base.sk;
8984 sk_mem_uncharge(sk, skb->truesize);
8985 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8986 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8987 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8988 &sk->sk_wmem_alloc));
8991 struct sctp_shared_key *shkey = chunk->shkey;
8993 /* refcnt == 2 and !list_empty mean after this release, it's
8994 * not being used anywhere, and it's time to notify userland
8995 * that this shkey can be freed if it's been deactivated.
8997 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8998 refcount_read(&shkey->refcnt) == 2) {
8999 struct sctp_ulpevent *ev;
9001 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9005 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9007 sctp_auth_shkey_release(chunk->shkey);
9011 sctp_wake_up_waiters(sk, asoc);
9013 sctp_association_put(asoc);
9016 /* Do accounting for the receive space on the socket.
9017 * Accounting for the association is done in ulpevent.c
9018 * We set this as a destructor for the cloned data skbs so that
9019 * accounting is done at the correct time.
9021 void sctp_sock_rfree(struct sk_buff *skb)
9023 struct sock *sk = skb->sk;
9024 struct sctp_ulpevent *event = sctp_skb2event(skb);
9026 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9029 * Mimic the behavior of sock_rfree
9031 sk_mem_uncharge(sk, event->rmem_len);
9035 /* Helper function to wait for space in the sndbuf. */
9036 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9039 struct sock *sk = asoc->base.sk;
9040 long current_timeo = *timeo_p;
9044 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9047 /* Increment the association's refcnt. */
9048 sctp_association_hold(asoc);
9050 /* Wait on the association specific sndbuf space. */
9052 prepare_to_wait_exclusive(&asoc->wait, &wait,
9053 TASK_INTERRUPTIBLE);
9054 if (asoc->base.dead)
9058 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9060 if (signal_pending(current))
9061 goto do_interrupted;
9062 if (sk_under_memory_pressure(sk))
9064 if ((int)msg_len <= sctp_wspace(asoc) &&
9065 sk_wmem_schedule(sk, msg_len))
9068 /* Let another process have a go. Since we are going
9072 current_timeo = schedule_timeout(current_timeo);
9074 if (sk != asoc->base.sk)
9077 *timeo_p = current_timeo;
9081 finish_wait(&asoc->wait, &wait);
9083 /* Release the association's refcnt. */
9084 sctp_association_put(asoc);
9097 err = sock_intr_errno(*timeo_p);
9105 void sctp_data_ready(struct sock *sk)
9107 struct socket_wq *wq;
9110 wq = rcu_dereference(sk->sk_wq);
9111 if (skwq_has_sleeper(wq))
9112 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9113 EPOLLRDNORM | EPOLLRDBAND);
9114 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9118 /* If socket sndbuf has changed, wake up all per association waiters. */
9119 void sctp_write_space(struct sock *sk)
9121 struct sctp_association *asoc;
9123 /* Wake up the tasks in each wait queue. */
9124 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9125 __sctp_write_space(asoc);
9129 /* Is there any sndbuf space available on the socket?
9131 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9132 * associations on the same socket. For a UDP-style socket with
9133 * multiple associations, it is possible for it to be "unwriteable"
9134 * prematurely. I assume that this is acceptable because
9135 * a premature "unwriteable" is better than an accidental "writeable" which
9136 * would cause an unwanted block under certain circumstances. For the 1-1
9137 * UDP-style sockets or TCP-style sockets, this code should work.
9140 static bool sctp_writeable(struct sock *sk)
9142 return sk->sk_sndbuf > sk->sk_wmem_queued;
9145 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9146 * returns immediately with EINPROGRESS.
9148 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9150 struct sock *sk = asoc->base.sk;
9152 long current_timeo = *timeo_p;
9155 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9157 /* Increment the association's refcnt. */
9158 sctp_association_hold(asoc);
9161 prepare_to_wait_exclusive(&asoc->wait, &wait,
9162 TASK_INTERRUPTIBLE);
9165 if (sk->sk_shutdown & RCV_SHUTDOWN)
9167 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9170 if (signal_pending(current))
9171 goto do_interrupted;
9173 if (sctp_state(asoc, ESTABLISHED))
9176 /* Let another process have a go. Since we are going
9180 current_timeo = schedule_timeout(current_timeo);
9183 *timeo_p = current_timeo;
9187 finish_wait(&asoc->wait, &wait);
9189 /* Release the association's refcnt. */
9190 sctp_association_put(asoc);
9195 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9198 err = -ECONNREFUSED;
9202 err = sock_intr_errno(*timeo_p);
9210 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9212 struct sctp_endpoint *ep;
9216 ep = sctp_sk(sk)->ep;
9220 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9221 TASK_INTERRUPTIBLE);
9223 if (list_empty(&ep->asocs)) {
9225 timeo = schedule_timeout(timeo);
9230 if (!sctp_sstate(sk, LISTENING))
9234 if (!list_empty(&ep->asocs))
9237 err = sock_intr_errno(timeo);
9238 if (signal_pending(current))
9246 finish_wait(sk_sleep(sk), &wait);
9251 static void sctp_wait_for_close(struct sock *sk, long timeout)
9256 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9257 if (list_empty(&sctp_sk(sk)->ep->asocs))
9260 timeout = schedule_timeout(timeout);
9262 } while (!signal_pending(current) && timeout);
9264 finish_wait(sk_sleep(sk), &wait);
9267 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9269 struct sk_buff *frag;
9274 /* Don't forget the fragments. */
9275 skb_walk_frags(skb, frag)
9276 sctp_skb_set_owner_r_frag(frag, sk);
9279 sctp_skb_set_owner_r(skb, sk);
9282 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9283 struct sctp_association *asoc)
9285 struct inet_sock *inet = inet_sk(sk);
9286 struct inet_sock *newinet;
9287 struct sctp_sock *sp = sctp_sk(sk);
9288 struct sctp_endpoint *ep = sp->ep;
9290 newsk->sk_type = sk->sk_type;
9291 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9292 newsk->sk_flags = sk->sk_flags;
9293 newsk->sk_tsflags = sk->sk_tsflags;
9294 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9295 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9296 newsk->sk_reuse = sk->sk_reuse;
9297 sctp_sk(newsk)->reuse = sp->reuse;
9299 newsk->sk_shutdown = sk->sk_shutdown;
9300 newsk->sk_destruct = sctp_destruct_sock;
9301 newsk->sk_family = sk->sk_family;
9302 newsk->sk_protocol = IPPROTO_SCTP;
9303 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9304 newsk->sk_sndbuf = sk->sk_sndbuf;
9305 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9306 newsk->sk_lingertime = sk->sk_lingertime;
9307 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9308 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9309 newsk->sk_rxhash = sk->sk_rxhash;
9311 newinet = inet_sk(newsk);
9313 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9314 * getsockname() and getpeername()
9316 newinet->inet_sport = inet->inet_sport;
9317 newinet->inet_saddr = inet->inet_saddr;
9318 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9319 newinet->inet_dport = htons(asoc->peer.port);
9320 newinet->pmtudisc = inet->pmtudisc;
9321 newinet->inet_id = prandom_u32();
9323 newinet->uc_ttl = inet->uc_ttl;
9324 newinet->mc_loop = 1;
9325 newinet->mc_ttl = 1;
9326 newinet->mc_index = 0;
9327 newinet->mc_list = NULL;
9329 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9330 net_enable_timestamp();
9332 /* Set newsk security attributes from original sk and connection
9333 * security attribute from ep.
9335 security_sctp_sk_clone(ep, sk, newsk);
9338 static inline void sctp_copy_descendant(struct sock *sk_to,
9339 const struct sock *sk_from)
9341 size_t ancestor_size = sizeof(struct inet_sock);
9343 ancestor_size += sk_from->sk_prot->obj_size;
9344 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9345 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9348 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9349 * and its messages to the newsk.
9351 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9352 struct sctp_association *assoc,
9353 enum sctp_socket_type type)
9355 struct sctp_sock *oldsp = sctp_sk(oldsk);
9356 struct sctp_sock *newsp = sctp_sk(newsk);
9357 struct sctp_bind_bucket *pp; /* hash list port iterator */
9358 struct sctp_endpoint *newep = newsp->ep;
9359 struct sk_buff *skb, *tmp;
9360 struct sctp_ulpevent *event;
9361 struct sctp_bind_hashbucket *head;
9364 /* Migrate socket buffer sizes and all the socket level options to the
9367 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9368 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9369 /* Brute force copy old sctp opt. */
9370 sctp_copy_descendant(newsk, oldsk);
9372 /* Restore the ep value that was overwritten with the above structure
9378 /* Hook this new socket in to the bind_hash list. */
9379 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9380 inet_sk(oldsk)->inet_num)];
9381 spin_lock_bh(&head->lock);
9382 pp = sctp_sk(oldsk)->bind_hash;
9383 sk_add_bind_node(newsk, &pp->owner);
9384 sctp_sk(newsk)->bind_hash = pp;
9385 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9386 spin_unlock_bh(&head->lock);
9388 /* Copy the bind_addr list from the original endpoint to the new
9389 * endpoint so that we can handle restarts properly
9391 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9392 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9396 /* New ep's auth_hmacs should be set if old ep's is set, in case
9397 * that net->sctp.auth_enable has been changed to 0 by users and
9398 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9400 if (oldsp->ep->auth_hmacs) {
9401 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9406 sctp_auto_asconf_init(newsp);
9408 /* Move any messages in the old socket's receive queue that are for the
9409 * peeled off association to the new socket's receive queue.
9411 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9412 event = sctp_skb2event(skb);
9413 if (event->asoc == assoc) {
9414 __skb_unlink(skb, &oldsk->sk_receive_queue);
9415 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9416 sctp_skb_set_owner_r_frag(skb, newsk);
9420 /* Clean up any messages pending delivery due to partial
9421 * delivery. Three cases:
9422 * 1) No partial deliver; no work.
9423 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9424 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9426 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9428 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9429 struct sk_buff_head *queue;
9431 /* Decide which queue to move pd_lobby skbs to. */
9432 if (assoc->ulpq.pd_mode) {
9433 queue = &newsp->pd_lobby;
9435 queue = &newsk->sk_receive_queue;
9437 /* Walk through the pd_lobby, looking for skbs that
9438 * need moved to the new socket.
9440 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9441 event = sctp_skb2event(skb);
9442 if (event->asoc == assoc) {
9443 __skb_unlink(skb, &oldsp->pd_lobby);
9444 __skb_queue_tail(queue, skb);
9445 sctp_skb_set_owner_r_frag(skb, newsk);
9449 /* Clear up any skbs waiting for the partial
9450 * delivery to finish.
9452 if (assoc->ulpq.pd_mode)
9453 sctp_clear_pd(oldsk, NULL);
9457 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9459 /* Set the type of socket to indicate that it is peeled off from the
9460 * original UDP-style socket or created with the accept() call on a
9461 * TCP-style socket..
9465 /* Mark the new socket "in-use" by the user so that any packets
9466 * that may arrive on the association after we've moved it are
9467 * queued to the backlog. This prevents a potential race between
9468 * backlog processing on the old socket and new-packet processing
9469 * on the new socket.
9471 * The caller has just allocated newsk so we can guarantee that other
9472 * paths won't try to lock it and then oldsk.
9474 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9475 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9476 sctp_assoc_migrate(assoc, newsk);
9477 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9479 /* If the association on the newsk is already closed before accept()
9480 * is called, set RCV_SHUTDOWN flag.
9482 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9483 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9484 newsk->sk_shutdown |= RCV_SHUTDOWN;
9486 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9489 release_sock(newsk);
9495 /* This proto struct describes the ULP interface for SCTP. */
9496 struct proto sctp_prot = {
9498 .owner = THIS_MODULE,
9499 .close = sctp_close,
9500 .disconnect = sctp_disconnect,
9501 .accept = sctp_accept,
9502 .ioctl = sctp_ioctl,
9503 .init = sctp_init_sock,
9504 .destroy = sctp_destroy_sock,
9505 .shutdown = sctp_shutdown,
9506 .setsockopt = sctp_setsockopt,
9507 .getsockopt = sctp_getsockopt,
9508 .sendmsg = sctp_sendmsg,
9509 .recvmsg = sctp_recvmsg,
9511 .bind_add = sctp_bind_add,
9512 .backlog_rcv = sctp_backlog_rcv,
9514 .unhash = sctp_unhash,
9515 .no_autobind = true,
9516 .obj_size = sizeof(struct sctp_sock),
9517 .useroffset = offsetof(struct sctp_sock, subscribe),
9518 .usersize = offsetof(struct sctp_sock, initmsg) -
9519 offsetof(struct sctp_sock, subscribe) +
9520 sizeof_field(struct sctp_sock, initmsg),
9521 .sysctl_mem = sysctl_sctp_mem,
9522 .sysctl_rmem = sysctl_sctp_rmem,
9523 .sysctl_wmem = sysctl_sctp_wmem,
9524 .memory_pressure = &sctp_memory_pressure,
9525 .enter_memory_pressure = sctp_enter_memory_pressure,
9526 .memory_allocated = &sctp_memory_allocated,
9527 .sockets_allocated = &sctp_sockets_allocated,
9530 #if IS_ENABLED(CONFIG_IPV6)
9532 #include <net/transp_v6.h>
9533 static void sctp_v6_destroy_sock(struct sock *sk)
9535 sctp_destroy_sock(sk);
9536 inet6_destroy_sock(sk);
9539 struct proto sctpv6_prot = {
9541 .owner = THIS_MODULE,
9542 .close = sctp_close,
9543 .disconnect = sctp_disconnect,
9544 .accept = sctp_accept,
9545 .ioctl = sctp_ioctl,
9546 .init = sctp_init_sock,
9547 .destroy = sctp_v6_destroy_sock,
9548 .shutdown = sctp_shutdown,
9549 .setsockopt = sctp_setsockopt,
9550 .getsockopt = sctp_getsockopt,
9551 .sendmsg = sctp_sendmsg,
9552 .recvmsg = sctp_recvmsg,
9554 .bind_add = sctp_bind_add,
9555 .backlog_rcv = sctp_backlog_rcv,
9557 .unhash = sctp_unhash,
9558 .no_autobind = true,
9559 .obj_size = sizeof(struct sctp6_sock),
9560 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9561 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9562 offsetof(struct sctp6_sock, sctp.subscribe) +
9563 sizeof_field(struct sctp6_sock, sctp.initmsg),
9564 .sysctl_mem = sysctl_sctp_mem,
9565 .sysctl_rmem = sysctl_sctp_rmem,
9566 .sysctl_wmem = sysctl_sctp_wmem,
9567 .memory_pressure = &sctp_memory_pressure,
9568 .enter_memory_pressure = sctp_enter_memory_pressure,
9569 .memory_allocated = &sctp_memory_allocated,
9570 .sockets_allocated = &sctp_sockets_allocated,
9572 #endif /* IS_ENABLED(CONFIG_IPV6) */