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 /* Bind a local address either to an endpoint or to an association. */
361 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
363 struct net *net = sock_net(sk);
364 struct sctp_sock *sp = sctp_sk(sk);
365 struct sctp_endpoint *ep = sp->ep;
366 struct sctp_bind_addr *bp = &ep->base.bind_addr;
371 /* Common sockaddr verification. */
372 af = sctp_sockaddr_af(sp, addr, len);
374 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
375 __func__, sk, addr, len);
379 snum = ntohs(addr->v4.sin_port);
381 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
382 __func__, sk, &addr->sa, bp->port, snum, len);
384 /* PF specific bind() address verification. */
385 if (!sp->pf->bind_verify(sp, addr))
386 return -EADDRNOTAVAIL;
388 /* We must either be unbound, or bind to the same port.
389 * It's OK to allow 0 ports if we are already bound.
390 * We'll just inhert an already bound port in this case
395 else if (snum != bp->port) {
396 pr_debug("%s: new port %d doesn't match existing port "
397 "%d\n", __func__, snum, bp->port);
402 if (snum && inet_port_requires_bind_service(net, snum) &&
403 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
406 /* See if the address matches any of the addresses we may have
407 * already bound before checking against other endpoints.
409 if (sctp_bind_addr_match(bp, addr, sp))
412 /* Make sure we are allowed to bind here.
413 * The function sctp_get_port_local() does duplicate address
416 addr->v4.sin_port = htons(snum);
417 if (sctp_get_port_local(sk, addr))
420 /* Refresh ephemeral port. */
422 bp->port = inet_sk(sk)->inet_num;
424 /* Add the address to the bind address list.
425 * Use GFP_ATOMIC since BHs will be disabled.
427 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
428 SCTP_ADDR_SRC, GFP_ATOMIC);
434 /* Copy back into socket for getsockname() use. */
435 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
436 sp->pf->to_sk_saddr(addr, sk);
441 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
443 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
444 * at any one time. If a sender, after sending an ASCONF chunk, decides
445 * it needs to transfer another ASCONF Chunk, it MUST wait until the
446 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
447 * subsequent ASCONF. Note this restriction binds each side, so at any
448 * time two ASCONF may be in-transit on any given association (one sent
449 * from each endpoint).
451 static int sctp_send_asconf(struct sctp_association *asoc,
452 struct sctp_chunk *chunk)
456 /* If there is an outstanding ASCONF chunk, queue it for later
459 if (asoc->addip_last_asconf) {
460 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
464 /* Hold the chunk until an ASCONF_ACK is received. */
465 sctp_chunk_hold(chunk);
466 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
468 sctp_chunk_free(chunk);
470 asoc->addip_last_asconf = chunk;
476 /* Add a list of addresses as bind addresses to local endpoint or
479 * Basically run through each address specified in the addrs/addrcnt
480 * array/length pair, determine if it is IPv6 or IPv4 and call
481 * sctp_do_bind() on it.
483 * If any of them fails, then the operation will be reversed and the
484 * ones that were added will be removed.
486 * Only sctp_setsockopt_bindx() is supposed to call this function.
488 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
493 struct sockaddr *sa_addr;
496 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
500 for (cnt = 0; cnt < addrcnt; cnt++) {
501 /* The list may contain either IPv4 or IPv6 address;
502 * determine the address length for walking thru the list.
505 af = sctp_get_af_specific(sa_addr->sa_family);
511 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
514 addr_buf += af->sockaddr_len;
518 /* Failed. Cleanup the ones that have been added */
520 sctp_bindx_rem(sk, addrs, cnt);
528 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
529 * associations that are part of the endpoint indicating that a list of local
530 * addresses are added to the endpoint.
532 * If any of the addresses is already in the bind address list of the
533 * association, we do not send the chunk for that association. But it will not
534 * affect other associations.
536 * Only sctp_setsockopt_bindx() is supposed to call this function.
538 static int sctp_send_asconf_add_ip(struct sock *sk,
539 struct sockaddr *addrs,
542 struct sctp_sock *sp;
543 struct sctp_endpoint *ep;
544 struct sctp_association *asoc;
545 struct sctp_bind_addr *bp;
546 struct sctp_chunk *chunk;
547 struct sctp_sockaddr_entry *laddr;
548 union sctp_addr *addr;
549 union sctp_addr saveaddr;
559 if (!ep->asconf_enable)
562 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
563 __func__, sk, addrs, addrcnt);
565 list_for_each_entry(asoc, &ep->asocs, asocs) {
566 if (!asoc->peer.asconf_capable)
569 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
572 if (!sctp_state(asoc, ESTABLISHED))
575 /* Check if any address in the packed array of addresses is
576 * in the bind address list of the association. If so,
577 * do not send the asconf chunk to its peer, but continue with
578 * other associations.
581 for (i = 0; i < addrcnt; i++) {
583 af = sctp_get_af_specific(addr->v4.sin_family);
589 if (sctp_assoc_lookup_laddr(asoc, addr))
592 addr_buf += af->sockaddr_len;
597 /* Use the first valid address in bind addr list of
598 * association as Address Parameter of ASCONF CHUNK.
600 bp = &asoc->base.bind_addr;
601 p = bp->address_list.next;
602 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
603 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
604 addrcnt, SCTP_PARAM_ADD_IP);
610 /* Add the new addresses to the bind address list with
611 * use_as_src set to 0.
614 for (i = 0; i < addrcnt; i++) {
616 af = sctp_get_af_specific(addr->v4.sin_family);
617 memcpy(&saveaddr, addr, af->sockaddr_len);
618 retval = sctp_add_bind_addr(bp, &saveaddr,
620 SCTP_ADDR_NEW, GFP_ATOMIC);
621 addr_buf += af->sockaddr_len;
623 if (asoc->src_out_of_asoc_ok) {
624 struct sctp_transport *trans;
626 list_for_each_entry(trans,
627 &asoc->peer.transport_addr_list, transports) {
628 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
629 2*asoc->pathmtu, 4380));
630 trans->ssthresh = asoc->peer.i.a_rwnd;
631 trans->rto = asoc->rto_initial;
632 sctp_max_rto(asoc, trans);
633 trans->rtt = trans->srtt = trans->rttvar = 0;
634 /* Clear the source and route cache */
635 sctp_transport_route(trans, NULL,
636 sctp_sk(asoc->base.sk));
639 retval = sctp_send_asconf(asoc, chunk);
646 /* Remove a list of addresses from bind addresses list. Do not remove the
649 * Basically run through each address specified in the addrs/addrcnt
650 * array/length pair, determine if it is IPv6 or IPv4 and call
651 * sctp_del_bind() on it.
653 * If any of them fails, then the operation will be reversed and the
654 * ones that were removed will be added back.
656 * At least one address has to be left; if only one address is
657 * available, the operation will return -EBUSY.
659 * Only sctp_setsockopt_bindx() is supposed to call this function.
661 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
663 struct sctp_sock *sp = sctp_sk(sk);
664 struct sctp_endpoint *ep = sp->ep;
666 struct sctp_bind_addr *bp = &ep->base.bind_addr;
669 union sctp_addr *sa_addr;
672 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
673 __func__, sk, addrs, addrcnt);
676 for (cnt = 0; cnt < addrcnt; cnt++) {
677 /* If the bind address list is empty or if there is only one
678 * bind address, there is nothing more to be removed (we need
679 * at least one address here).
681 if (list_empty(&bp->address_list) ||
682 (sctp_list_single_entry(&bp->address_list))) {
688 af = sctp_get_af_specific(sa_addr->sa.sa_family);
694 if (!af->addr_valid(sa_addr, sp, NULL)) {
695 retval = -EADDRNOTAVAIL;
699 if (sa_addr->v4.sin_port &&
700 sa_addr->v4.sin_port != htons(bp->port)) {
705 if (!sa_addr->v4.sin_port)
706 sa_addr->v4.sin_port = htons(bp->port);
708 /* FIXME - There is probably a need to check if sk->sk_saddr and
709 * sk->sk_rcv_addr are currently set to one of the addresses to
710 * be removed. This is something which needs to be looked into
711 * when we are fixing the outstanding issues with multi-homing
712 * socket routing and failover schemes. Refer to comments in
713 * sctp_do_bind(). -daisy
715 retval = sctp_del_bind_addr(bp, sa_addr);
717 addr_buf += af->sockaddr_len;
720 /* Failed. Add the ones that has been removed back */
722 sctp_bindx_add(sk, addrs, cnt);
730 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
731 * the associations that are part of the endpoint indicating that a list of
732 * local addresses are removed from the endpoint.
734 * If any of the addresses is already in the bind address list of the
735 * association, we do not send the chunk for that association. But it will not
736 * affect other associations.
738 * Only sctp_setsockopt_bindx() is supposed to call this function.
740 static int sctp_send_asconf_del_ip(struct sock *sk,
741 struct sockaddr *addrs,
744 struct sctp_sock *sp;
745 struct sctp_endpoint *ep;
746 struct sctp_association *asoc;
747 struct sctp_transport *transport;
748 struct sctp_bind_addr *bp;
749 struct sctp_chunk *chunk;
750 union sctp_addr *laddr;
753 struct sctp_sockaddr_entry *saddr;
762 if (!ep->asconf_enable)
765 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
766 __func__, sk, addrs, addrcnt);
768 list_for_each_entry(asoc, &ep->asocs, asocs) {
770 if (!asoc->peer.asconf_capable)
773 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776 if (!sctp_state(asoc, ESTABLISHED))
779 /* Check if any address in the packed array of addresses is
780 * not present in the bind address list of the association.
781 * If so, do not send the asconf chunk to its peer, but
782 * continue with other associations.
785 for (i = 0; i < addrcnt; i++) {
787 af = sctp_get_af_specific(laddr->v4.sin_family);
793 if (!sctp_assoc_lookup_laddr(asoc, laddr))
796 addr_buf += af->sockaddr_len;
801 /* Find one address in the association's bind address list
802 * that is not in the packed array of addresses. This is to
803 * make sure that we do not delete all the addresses in the
806 bp = &asoc->base.bind_addr;
807 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
809 if ((laddr == NULL) && (addrcnt == 1)) {
810 if (asoc->asconf_addr_del_pending)
812 asoc->asconf_addr_del_pending =
813 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
814 if (asoc->asconf_addr_del_pending == NULL) {
818 asoc->asconf_addr_del_pending->sa.sa_family =
820 asoc->asconf_addr_del_pending->v4.sin_port =
822 if (addrs->sa_family == AF_INET) {
823 struct sockaddr_in *sin;
825 sin = (struct sockaddr_in *)addrs;
826 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
827 } else if (addrs->sa_family == AF_INET6) {
828 struct sockaddr_in6 *sin6;
830 sin6 = (struct sockaddr_in6 *)addrs;
831 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
835 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
836 asoc->asconf_addr_del_pending);
838 asoc->src_out_of_asoc_ok = 1;
846 /* We do not need RCU protection throughout this loop
847 * because this is done under a socket lock from the
850 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
858 /* Reset use_as_src flag for the addresses in the bind address
859 * list that are to be deleted.
862 for (i = 0; i < addrcnt; i++) {
864 af = sctp_get_af_specific(laddr->v4.sin_family);
865 list_for_each_entry(saddr, &bp->address_list, list) {
866 if (sctp_cmp_addr_exact(&saddr->a, laddr))
867 saddr->state = SCTP_ADDR_DEL;
869 addr_buf += af->sockaddr_len;
872 /* Update the route and saddr entries for all the transports
873 * as some of the addresses in the bind address list are
874 * about to be deleted and cannot be used as source addresses.
876 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
878 sctp_transport_route(transport, NULL,
879 sctp_sk(asoc->base.sk));
883 /* We don't need to transmit ASCONF */
885 retval = sctp_send_asconf(asoc, chunk);
891 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
892 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
894 struct sock *sk = sctp_opt2sk(sp);
895 union sctp_addr *addr;
898 /* It is safe to write port space in caller. */
900 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
901 af = sctp_get_af_specific(addr->sa.sa_family);
904 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
907 if (addrw->state == SCTP_ADDR_NEW)
908 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
910 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
913 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
916 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
919 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
920 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
923 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
924 * Section 3.1.2 for this usage.
926 * addrs is a pointer to an array of one or more socket addresses. Each
927 * address is contained in its appropriate structure (i.e. struct
928 * sockaddr_in or struct sockaddr_in6) the family of the address type
929 * must be used to distinguish the address length (note that this
930 * representation is termed a "packed array" of addresses). The caller
931 * specifies the number of addresses in the array with addrcnt.
933 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
934 * -1, and sets errno to the appropriate error code.
936 * For SCTP, the port given in each socket address must be the same, or
937 * sctp_bindx() will fail, setting errno to EINVAL.
939 * The flags parameter is formed from the bitwise OR of zero or more of
940 * the following currently defined flags:
942 * SCTP_BINDX_ADD_ADDR
944 * SCTP_BINDX_REM_ADDR
946 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
947 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
948 * addresses from the association. The two flags are mutually exclusive;
949 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
950 * not remove all addresses from an association; sctp_bindx() will
951 * reject such an attempt with EINVAL.
953 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
954 * additional addresses with an endpoint after calling bind(). Or use
955 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
956 * socket is associated with so that no new association accepted will be
957 * associated with those addresses. If the endpoint supports dynamic
958 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
959 * endpoint to send the appropriate message to the peer to change the
960 * peers address lists.
962 * Adding and removing addresses from a connected association is
963 * optional functionality. Implementations that do not support this
964 * functionality should return EOPNOTSUPP.
966 * Basically do nothing but copying the addresses from user to kernel
967 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
968 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
971 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
974 * sk The sk of the socket
975 * addrs The pointer to the addresses
976 * addrssize Size of the addrs buffer
977 * op Operation to perform (add or remove, see the flags of
980 * Returns 0 if ok, <0 errno code on error.
982 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
983 int addrs_size, int op)
988 struct sockaddr *sa_addr;
989 void *addr_buf = addrs;
992 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
993 __func__, sk, addr_buf, addrs_size, op);
995 if (unlikely(addrs_size <= 0))
998 /* Walk through the addrs buffer and count the number of addresses. */
999 while (walk_size < addrs_size) {
1000 if (walk_size + sizeof(sa_family_t) > addrs_size)
1004 af = sctp_get_af_specific(sa_addr->sa_family);
1006 /* If the address family is not supported or if this address
1007 * causes the address buffer to overflow return EINVAL.
1009 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1012 addr_buf += af->sockaddr_len;
1013 walk_size += af->sockaddr_len;
1018 case SCTP_BINDX_ADD_ADDR:
1019 /* Allow security module to validate bindx addresses. */
1020 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1024 err = sctp_bindx_add(sk, addrs, addrcnt);
1027 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1028 case SCTP_BINDX_REM_ADDR:
1029 err = sctp_bindx_rem(sk, addrs, addrcnt);
1032 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1039 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1045 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1050 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1051 const union sctp_addr *daddr,
1052 const struct sctp_initmsg *init,
1053 struct sctp_transport **tp)
1055 struct sctp_association *asoc;
1056 struct sock *sk = ep->base.sk;
1057 struct net *net = sock_net(sk);
1058 enum sctp_scope scope;
1061 if (sctp_endpoint_is_peeled_off(ep, daddr))
1062 return -EADDRNOTAVAIL;
1064 if (!ep->base.bind_addr.port) {
1065 if (sctp_autobind(sk))
1068 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1069 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1073 scope = sctp_scope(daddr);
1074 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1078 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1082 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1091 if (init->sinit_num_ostreams) {
1092 __u16 outcnt = init->sinit_num_ostreams;
1094 asoc->c.sinit_num_ostreams = outcnt;
1095 /* outcnt has been changed, need to re-init stream */
1096 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1101 if (init->sinit_max_instreams)
1102 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1104 if (init->sinit_max_attempts)
1105 asoc->max_init_attempts = init->sinit_max_attempts;
1107 if (init->sinit_max_init_timeo)
1108 asoc->max_init_timeo =
1109 msecs_to_jiffies(init->sinit_max_init_timeo);
1113 sctp_association_free(asoc);
1117 static int sctp_connect_add_peer(struct sctp_association *asoc,
1118 union sctp_addr *daddr, int addr_len)
1120 struct sctp_endpoint *ep = asoc->ep;
1121 struct sctp_association *old;
1122 struct sctp_transport *t;
1125 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1129 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1130 if (old && old != asoc)
1131 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1134 if (sctp_endpoint_is_peeled_off(ep, daddr))
1135 return -EADDRNOTAVAIL;
1137 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1144 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1146 * Common routine for handling connect() and sctp_connectx().
1147 * Connect will come in with just a single address.
1149 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1150 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1152 struct sctp_sock *sp = sctp_sk(sk);
1153 struct sctp_endpoint *ep = sp->ep;
1154 struct sctp_transport *transport;
1155 struct sctp_association *asoc;
1156 void *addr_buf = kaddrs;
1157 union sctp_addr *daddr;
1162 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1163 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1167 af = sctp_get_af_specific(daddr->sa.sa_family);
1168 if (!af || af->sockaddr_len > addrs_size)
1171 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1175 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1177 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1180 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1183 asoc = transport->asoc;
1185 addr_buf += af->sockaddr_len;
1186 walk_size = af->sockaddr_len;
1187 while (walk_size < addrs_size) {
1189 if (walk_size + sizeof(sa_family_t) > addrs_size)
1193 af = sctp_get_af_specific(daddr->sa.sa_family);
1194 if (!af || af->sockaddr_len + walk_size > addrs_size)
1197 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1200 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1204 addr_buf += af->sockaddr_len;
1205 walk_size += af->sockaddr_len;
1208 /* In case the user of sctp_connectx() wants an association
1209 * id back, assign one now.
1212 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1217 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1221 /* Initialize sk's dport and daddr for getpeername() */
1222 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1223 sp->pf->to_sk_daddr(daddr, sk);
1227 *assoc_id = asoc->assoc_id;
1229 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1230 return sctp_wait_for_connect(asoc, &timeo);
1233 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1234 __func__, asoc, kaddrs, err);
1235 sctp_association_free(asoc);
1239 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1242 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1243 * sctp_assoc_t *asoc);
1245 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1246 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1247 * or IPv6 addresses.
1249 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1250 * Section 3.1.2 for this usage.
1252 * addrs is a pointer to an array of one or more socket addresses. Each
1253 * address is contained in its appropriate structure (i.e. struct
1254 * sockaddr_in or struct sockaddr_in6) the family of the address type
1255 * must be used to distengish the address length (note that this
1256 * representation is termed a "packed array" of addresses). The caller
1257 * specifies the number of addresses in the array with addrcnt.
1259 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1260 * the association id of the new association. On failure, sctp_connectx()
1261 * returns -1, and sets errno to the appropriate error code. The assoc_id
1262 * is not touched by the kernel.
1264 * For SCTP, the port given in each socket address must be the same, or
1265 * sctp_connectx() will fail, setting errno to EINVAL.
1267 * An application can use sctp_connectx to initiate an association with
1268 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1269 * allows a caller to specify multiple addresses at which a peer can be
1270 * reached. The way the SCTP stack uses the list of addresses to set up
1271 * the association is implementation dependent. This function only
1272 * specifies that the stack will try to make use of all the addresses in
1273 * the list when needed.
1275 * Note that the list of addresses passed in is only used for setting up
1276 * the association. It does not necessarily equal the set of addresses
1277 * the peer uses for the resulting association. If the caller wants to
1278 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1279 * retrieve them after the association has been set up.
1281 * Basically do nothing but copying the addresses from user to kernel
1282 * land and invoking either sctp_connectx(). This is used for tunneling
1283 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1285 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1288 * sk The sk of the socket
1289 * addrs The pointer to the addresses
1290 * addrssize Size of the addrs buffer
1292 * Returns >=0 if ok, <0 errno code on error.
1294 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1295 int addrs_size, sctp_assoc_t *assoc_id)
1297 int err = 0, flags = 0;
1299 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1300 __func__, sk, kaddrs, addrs_size);
1302 /* make sure the 1st addr's sa_family is accessible later */
1303 if (unlikely(addrs_size < sizeof(sa_family_t)))
1306 /* Allow security module to validate connectx addresses. */
1307 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1308 (struct sockaddr *)kaddrs,
1313 /* in-kernel sockets don't generally have a file allocated to them
1314 * if all they do is call sock_create_kern().
1316 if (sk->sk_socket->file)
1317 flags = sk->sk_socket->file->f_flags;
1319 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1323 * This is an older interface. It's kept for backward compatibility
1324 * to the option that doesn't provide association id.
1326 static int sctp_setsockopt_connectx_old(struct sock *sk,
1327 struct sockaddr *kaddrs,
1330 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1334 * New interface for the API. The since the API is done with a socket
1335 * option, to make it simple we feed back the association id is as a return
1336 * indication to the call. Error is always negative and association id is
1339 static int sctp_setsockopt_connectx(struct sock *sk,
1340 struct sockaddr *kaddrs,
1343 sctp_assoc_t assoc_id = 0;
1346 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1355 * New (hopefully final) interface for the API.
1356 * We use the sctp_getaddrs_old structure so that use-space library
1357 * can avoid any unnecessary allocations. The only different part
1358 * is that we store the actual length of the address buffer into the
1359 * addrs_num structure member. That way we can re-use the existing
1362 #ifdef CONFIG_COMPAT
1363 struct compat_sctp_getaddrs_old {
1364 sctp_assoc_t assoc_id;
1366 compat_uptr_t addrs; /* struct sockaddr * */
1370 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1371 char __user *optval,
1374 struct sctp_getaddrs_old param;
1375 sctp_assoc_t assoc_id = 0;
1376 struct sockaddr *kaddrs;
1379 #ifdef CONFIG_COMPAT
1380 if (in_compat_syscall()) {
1381 struct compat_sctp_getaddrs_old param32;
1383 if (len < sizeof(param32))
1385 if (copy_from_user(¶m32, optval, sizeof(param32)))
1388 param.assoc_id = param32.assoc_id;
1389 param.addr_num = param32.addr_num;
1390 param.addrs = compat_ptr(param32.addrs);
1394 if (len < sizeof(param))
1396 if (copy_from_user(¶m, optval, sizeof(param)))
1400 kaddrs = memdup_user(param.addrs, param.addr_num);
1402 return PTR_ERR(kaddrs);
1404 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1406 if (err == 0 || err == -EINPROGRESS) {
1407 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1409 if (put_user(sizeof(assoc_id), optlen))
1416 /* API 3.1.4 close() - UDP Style Syntax
1417 * Applications use close() to perform graceful shutdown (as described in
1418 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1419 * by a UDP-style socket.
1423 * ret = close(int sd);
1425 * sd - the socket descriptor of the associations to be closed.
1427 * To gracefully shutdown a specific association represented by the
1428 * UDP-style socket, an application should use the sendmsg() call,
1429 * passing no user data, but including the appropriate flag in the
1430 * ancillary data (see Section xxxx).
1432 * If sd in the close() call is a branched-off socket representing only
1433 * one association, the shutdown is performed on that association only.
1435 * 4.1.6 close() - TCP Style Syntax
1437 * Applications use close() to gracefully close down an association.
1441 * int close(int sd);
1443 * sd - the socket descriptor of the association to be closed.
1445 * After an application calls close() on a socket descriptor, no further
1446 * socket operations will succeed on that descriptor.
1448 * API 7.1.4 SO_LINGER
1450 * An application using the TCP-style socket can use this option to
1451 * perform the SCTP ABORT primitive. The linger option structure is:
1454 * int l_onoff; // option on/off
1455 * int l_linger; // linger time
1458 * To enable the option, set l_onoff to 1. If the l_linger value is set
1459 * to 0, calling close() is the same as the ABORT primitive. If the
1460 * value is set to a negative value, the setsockopt() call will return
1461 * an error. If the value is set to a positive value linger_time, the
1462 * close() can be blocked for at most linger_time ms. If the graceful
1463 * shutdown phase does not finish during this period, close() will
1464 * return but the graceful shutdown phase continues in the system.
1466 static void sctp_close(struct sock *sk, long timeout)
1468 struct net *net = sock_net(sk);
1469 struct sctp_endpoint *ep;
1470 struct sctp_association *asoc;
1471 struct list_head *pos, *temp;
1472 unsigned int data_was_unread;
1474 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1476 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1477 sk->sk_shutdown = SHUTDOWN_MASK;
1478 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1480 ep = sctp_sk(sk)->ep;
1482 /* Clean up any skbs sitting on the receive queue. */
1483 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1484 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1486 /* Walk all associations on an endpoint. */
1487 list_for_each_safe(pos, temp, &ep->asocs) {
1488 asoc = list_entry(pos, struct sctp_association, asocs);
1490 if (sctp_style(sk, TCP)) {
1491 /* A closed association can still be in the list if
1492 * it belongs to a TCP-style listening socket that is
1493 * not yet accepted. If so, free it. If not, send an
1494 * ABORT or SHUTDOWN based on the linger options.
1496 if (sctp_state(asoc, CLOSED)) {
1497 sctp_association_free(asoc);
1502 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1503 !skb_queue_empty(&asoc->ulpq.reasm) ||
1504 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1505 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1506 struct sctp_chunk *chunk;
1508 chunk = sctp_make_abort_user(asoc, NULL, 0);
1509 sctp_primitive_ABORT(net, asoc, chunk);
1511 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1514 /* On a TCP-style socket, block for at most linger_time if set. */
1515 if (sctp_style(sk, TCP) && timeout)
1516 sctp_wait_for_close(sk, timeout);
1518 /* This will run the backlog queue. */
1521 /* Supposedly, no process has access to the socket, but
1522 * the net layers still may.
1527 /* Hold the sock, since sk_common_release() will put sock_put()
1528 * and we have just a little more cleanup.
1531 sk_common_release(sk);
1538 SCTP_DBG_OBJCNT_DEC(sock);
1541 /* Handle EPIPE error. */
1542 static int sctp_error(struct sock *sk, int flags, int err)
1545 err = sock_error(sk) ? : -EPIPE;
1546 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1547 send_sig(SIGPIPE, current, 0);
1551 /* API 3.1.3 sendmsg() - UDP Style Syntax
1553 * An application uses sendmsg() and recvmsg() calls to transmit data to
1554 * and receive data from its peer.
1556 * ssize_t sendmsg(int socket, const struct msghdr *message,
1559 * socket - the socket descriptor of the endpoint.
1560 * message - pointer to the msghdr structure which contains a single
1561 * user message and possibly some ancillary data.
1563 * See Section 5 for complete description of the data
1566 * flags - flags sent or received with the user message, see Section
1567 * 5 for complete description of the flags.
1569 * Note: This function could use a rewrite especially when explicit
1570 * connect support comes in.
1572 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1574 static int sctp_msghdr_parse(const struct msghdr *msg,
1575 struct sctp_cmsgs *cmsgs);
1577 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1578 struct sctp_sndrcvinfo *srinfo,
1579 const struct msghdr *msg, size_t msg_len)
1584 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1587 if (msg_len > sk->sk_sndbuf)
1590 memset(cmsgs, 0, sizeof(*cmsgs));
1591 err = sctp_msghdr_parse(msg, cmsgs);
1593 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1597 memset(srinfo, 0, sizeof(*srinfo));
1598 if (cmsgs->srinfo) {
1599 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1600 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1601 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1602 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1603 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1604 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1608 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1609 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1610 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1611 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1612 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1615 if (cmsgs->prinfo) {
1616 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1617 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1618 cmsgs->prinfo->pr_policy);
1621 sflags = srinfo->sinfo_flags;
1622 if (!sflags && msg_len)
1625 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1628 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1629 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1632 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1638 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1639 struct sctp_cmsgs *cmsgs,
1640 union sctp_addr *daddr,
1641 struct sctp_transport **tp)
1643 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1644 struct sctp_association *asoc;
1645 struct cmsghdr *cmsg;
1646 __be32 flowinfo = 0;
1652 if (sflags & (SCTP_EOF | SCTP_ABORT))
1655 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1656 sctp_sstate(sk, CLOSING)))
1657 return -EADDRNOTAVAIL;
1659 /* Label connection socket for first association 1-to-many
1660 * style for client sequence socket()->sendmsg(). This
1661 * needs to be done before sctp_assoc_add_peer() as that will
1662 * set up the initial packet that needs to account for any
1663 * security ip options (CIPSO/CALIPSO) added to the packet.
1665 af = sctp_get_af_specific(daddr->sa.sa_family);
1668 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1669 (struct sockaddr *)daddr,
1674 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1679 if (!cmsgs->addrs_msg)
1682 if (daddr->sa.sa_family == AF_INET6)
1683 flowinfo = daddr->v6.sin6_flowinfo;
1685 /* sendv addr list parse */
1686 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1687 union sctp_addr _daddr;
1690 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1691 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1692 cmsg->cmsg_type != SCTP_DSTADDRV6))
1696 memset(daddr, 0, sizeof(*daddr));
1697 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1698 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1699 if (dlen < sizeof(struct in_addr)) {
1704 dlen = sizeof(struct in_addr);
1705 daddr->v4.sin_family = AF_INET;
1706 daddr->v4.sin_port = htons(asoc->peer.port);
1707 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1709 if (dlen < sizeof(struct in6_addr)) {
1714 dlen = sizeof(struct in6_addr);
1715 daddr->v6.sin6_flowinfo = flowinfo;
1716 daddr->v6.sin6_family = AF_INET6;
1717 daddr->v6.sin6_port = htons(asoc->peer.port);
1718 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1721 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1729 sctp_association_free(asoc);
1733 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1734 __u16 sflags, struct msghdr *msg,
1737 struct sock *sk = asoc->base.sk;
1738 struct net *net = sock_net(sk);
1740 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1743 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1744 !sctp_state(asoc, ESTABLISHED))
1747 if (sflags & SCTP_EOF) {
1748 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1749 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1754 if (sflags & SCTP_ABORT) {
1755 struct sctp_chunk *chunk;
1757 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1761 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1762 sctp_primitive_ABORT(net, asoc, chunk);
1763 iov_iter_revert(&msg->msg_iter, msg_len);
1771 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1772 struct msghdr *msg, size_t msg_len,
1773 struct sctp_transport *transport,
1774 struct sctp_sndrcvinfo *sinfo)
1776 struct sock *sk = asoc->base.sk;
1777 struct sctp_sock *sp = sctp_sk(sk);
1778 struct net *net = sock_net(sk);
1779 struct sctp_datamsg *datamsg;
1780 bool wait_connect = false;
1781 struct sctp_chunk *chunk;
1785 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1790 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1791 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1796 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1801 if (asoc->pmtu_pending) {
1802 if (sp->param_flags & SPP_PMTUD_ENABLE)
1803 sctp_assoc_sync_pmtu(asoc);
1804 asoc->pmtu_pending = 0;
1807 if (sctp_wspace(asoc) < (int)msg_len)
1808 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1810 if (sk_under_memory_pressure(sk))
1813 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1814 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1815 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1820 if (sctp_state(asoc, CLOSED)) {
1821 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1825 if (asoc->ep->intl_enable) {
1826 timeo = sock_sndtimeo(sk, 0);
1827 err = sctp_wait_for_connect(asoc, &timeo);
1833 wait_connect = true;
1836 pr_debug("%s: we associated primitively\n", __func__);
1839 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1840 if (IS_ERR(datamsg)) {
1841 err = PTR_ERR(datamsg);
1845 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1847 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1848 sctp_chunk_hold(chunk);
1849 sctp_set_owner_w(chunk);
1850 chunk->transport = transport;
1853 err = sctp_primitive_SEND(net, asoc, datamsg);
1855 sctp_datamsg_free(datamsg);
1859 pr_debug("%s: we sent primitively\n", __func__);
1861 sctp_datamsg_put(datamsg);
1863 if (unlikely(wait_connect)) {
1864 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1865 sctp_wait_for_connect(asoc, &timeo);
1874 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1875 const struct msghdr *msg,
1876 struct sctp_cmsgs *cmsgs)
1878 union sctp_addr *daddr = NULL;
1881 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1882 int len = msg->msg_namelen;
1884 if (len > sizeof(*daddr))
1885 len = sizeof(*daddr);
1887 daddr = (union sctp_addr *)msg->msg_name;
1889 err = sctp_verify_addr(sk, daddr, len);
1891 return ERR_PTR(err);
1897 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1898 struct sctp_sndrcvinfo *sinfo,
1899 struct sctp_cmsgs *cmsgs)
1901 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1902 sinfo->sinfo_stream = asoc->default_stream;
1903 sinfo->sinfo_ppid = asoc->default_ppid;
1904 sinfo->sinfo_context = asoc->default_context;
1905 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1908 sinfo->sinfo_flags = asoc->default_flags;
1911 if (!cmsgs->srinfo && !cmsgs->prinfo)
1912 sinfo->sinfo_timetolive = asoc->default_timetolive;
1914 if (cmsgs->authinfo) {
1915 /* Reuse sinfo_tsn to indicate that authinfo was set and
1916 * sinfo_ssn to save the keyid on tx path.
1918 sinfo->sinfo_tsn = 1;
1919 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1923 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1925 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1926 struct sctp_transport *transport = NULL;
1927 struct sctp_sndrcvinfo _sinfo, *sinfo;
1928 struct sctp_association *asoc, *tmp;
1929 struct sctp_cmsgs cmsgs;
1930 union sctp_addr *daddr;
1935 /* Parse and get snd_info */
1936 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1941 sflags = sinfo->sinfo_flags;
1943 /* Get daddr from msg */
1944 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1945 if (IS_ERR(daddr)) {
1946 err = PTR_ERR(daddr);
1952 /* SCTP_SENDALL process */
1953 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1954 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1955 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1962 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1964 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1969 iov_iter_revert(&msg->msg_iter, err);
1975 /* Get and check or create asoc */
1977 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1979 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1984 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1989 asoc = transport->asoc;
1993 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
1996 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2002 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2007 /* Update snd_info with the asoc */
2008 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2010 /* Send msg to the asoc */
2011 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2012 if (err < 0 && err != -ESRCH && new)
2013 sctp_association_free(asoc);
2018 return sctp_error(sk, msg->msg_flags, err);
2021 /* This is an extended version of skb_pull() that removes the data from the
2022 * start of a skb even when data is spread across the list of skb's in the
2023 * frag_list. len specifies the total amount of data that needs to be removed.
2024 * when 'len' bytes could be removed from the skb, it returns 0.
2025 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2026 * could not be removed.
2028 static int sctp_skb_pull(struct sk_buff *skb, int len)
2030 struct sk_buff *list;
2031 int skb_len = skb_headlen(skb);
2034 if (len <= skb_len) {
2035 __skb_pull(skb, len);
2039 __skb_pull(skb, skb_len);
2041 skb_walk_frags(skb, list) {
2042 rlen = sctp_skb_pull(list, len);
2043 skb->len -= (len-rlen);
2044 skb->data_len -= (len-rlen);
2055 /* API 3.1.3 recvmsg() - UDP Style Syntax
2057 * ssize_t recvmsg(int socket, struct msghdr *message,
2060 * socket - the socket descriptor of the endpoint.
2061 * message - pointer to the msghdr structure which contains a single
2062 * user message and possibly some ancillary data.
2064 * See Section 5 for complete description of the data
2067 * flags - flags sent or received with the user message, see Section
2068 * 5 for complete description of the flags.
2070 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2071 int noblock, int flags, int *addr_len)
2073 struct sctp_ulpevent *event = NULL;
2074 struct sctp_sock *sp = sctp_sk(sk);
2075 struct sk_buff *skb, *head_skb;
2080 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2081 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2086 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2087 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2092 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2096 /* Get the total length of the skb including any skb's in the
2105 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2107 event = sctp_skb2event(skb);
2112 if (event->chunk && event->chunk->head_skb)
2113 head_skb = event->chunk->head_skb;
2116 sock_recv_ts_and_drops(msg, sk, head_skb);
2117 if (sctp_ulpevent_is_notification(event)) {
2118 msg->msg_flags |= MSG_NOTIFICATION;
2119 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2121 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2124 /* Check if we allow SCTP_NXTINFO. */
2125 if (sp->recvnxtinfo)
2126 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2127 /* Check if we allow SCTP_RCVINFO. */
2128 if (sp->recvrcvinfo)
2129 sctp_ulpevent_read_rcvinfo(event, msg);
2130 /* Check if we allow SCTP_SNDRCVINFO. */
2131 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2132 sctp_ulpevent_read_sndrcvinfo(event, msg);
2136 /* If skb's length exceeds the user's buffer, update the skb and
2137 * push it back to the receive_queue so that the next call to
2138 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2140 if (skb_len > copied) {
2141 msg->msg_flags &= ~MSG_EOR;
2142 if (flags & MSG_PEEK)
2144 sctp_skb_pull(skb, copied);
2145 skb_queue_head(&sk->sk_receive_queue, skb);
2147 /* When only partial message is copied to the user, increase
2148 * rwnd by that amount. If all the data in the skb is read,
2149 * rwnd is updated when the event is freed.
2151 if (!sctp_ulpevent_is_notification(event))
2152 sctp_assoc_rwnd_increase(event->asoc, copied);
2154 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2155 (event->msg_flags & MSG_EOR))
2156 msg->msg_flags |= MSG_EOR;
2158 msg->msg_flags &= ~MSG_EOR;
2161 if (flags & MSG_PEEK) {
2162 /* Release the skb reference acquired after peeking the skb in
2163 * sctp_skb_recv_datagram().
2167 /* Free the event which includes releasing the reference to
2168 * the owner of the skb, freeing the skb and updating the
2171 sctp_ulpevent_free(event);
2178 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2180 * This option is a on/off flag. If enabled no SCTP message
2181 * fragmentation will be performed. Instead if a message being sent
2182 * exceeds the current PMTU size, the message will NOT be sent and
2183 * instead a error will be indicated to the user.
2185 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2186 unsigned int optlen)
2188 if (optlen < sizeof(int))
2190 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2194 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2195 unsigned int optlen)
2197 struct sctp_sock *sp = sctp_sk(sk);
2198 struct sctp_association *asoc;
2201 if (optlen > sizeof(struct sctp_event_subscribe))
2204 for (i = 0; i < optlen; i++)
2205 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2208 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2209 asoc->subscribe = sctp_sk(sk)->subscribe;
2211 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2212 * if there is no data to be sent or retransmit, the stack will
2213 * immediately send up this notification.
2215 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2216 struct sctp_ulpevent *event;
2218 asoc = sctp_id2assoc(sk, 0);
2219 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2220 event = sctp_ulpevent_make_sender_dry_event(asoc,
2221 GFP_USER | __GFP_NOWARN);
2225 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2232 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2234 * This socket option is applicable to the UDP-style socket only. When
2235 * set it will cause associations that are idle for more than the
2236 * specified number of seconds to automatically close. An association
2237 * being idle is defined an association that has NOT sent or received
2238 * user data. The special value of '0' indicates that no automatic
2239 * close of any associations should be performed. The option expects an
2240 * integer defining the number of seconds of idle time before an
2241 * association is closed.
2243 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2244 unsigned int optlen)
2246 struct sctp_sock *sp = sctp_sk(sk);
2247 struct net *net = sock_net(sk);
2249 /* Applicable to UDP-style socket only */
2250 if (sctp_style(sk, TCP))
2252 if (optlen != sizeof(int))
2255 sp->autoclose = *optval;
2256 if (sp->autoclose > net->sctp.max_autoclose)
2257 sp->autoclose = net->sctp.max_autoclose;
2262 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2264 * Applications can enable or disable heartbeats for any peer address of
2265 * an association, modify an address's heartbeat interval, force a
2266 * heartbeat to be sent immediately, and adjust the address's maximum
2267 * number of retransmissions sent before an address is considered
2268 * unreachable. The following structure is used to access and modify an
2269 * address's parameters:
2271 * struct sctp_paddrparams {
2272 * sctp_assoc_t spp_assoc_id;
2273 * struct sockaddr_storage spp_address;
2274 * uint32_t spp_hbinterval;
2275 * uint16_t spp_pathmaxrxt;
2276 * uint32_t spp_pathmtu;
2277 * uint32_t spp_sackdelay;
2278 * uint32_t spp_flags;
2279 * uint32_t spp_ipv6_flowlabel;
2283 * spp_assoc_id - (one-to-many style socket) This is filled in the
2284 * application, and identifies the association for
2286 * spp_address - This specifies which address is of interest.
2287 * spp_hbinterval - This contains the value of the heartbeat interval,
2288 * in milliseconds. If a value of zero
2289 * is present in this field then no changes are to
2290 * be made to this parameter.
2291 * spp_pathmaxrxt - This contains the maximum number of
2292 * retransmissions before this address shall be
2293 * considered unreachable. If a value of zero
2294 * is present in this field then no changes are to
2295 * be made to this parameter.
2296 * spp_pathmtu - When Path MTU discovery is disabled the value
2297 * specified here will be the "fixed" path mtu.
2298 * Note that if the spp_address field is empty
2299 * then all associations on this address will
2300 * have this fixed path mtu set upon them.
2302 * spp_sackdelay - When delayed sack is enabled, this value specifies
2303 * the number of milliseconds that sacks will be delayed
2304 * for. This value will apply to all addresses of an
2305 * association if the spp_address field is empty. Note
2306 * also, that if delayed sack is enabled and this
2307 * value is set to 0, no change is made to the last
2308 * recorded delayed sack timer value.
2310 * spp_flags - These flags are used to control various features
2311 * on an association. The flag field may contain
2312 * zero or more of the following options.
2314 * SPP_HB_ENABLE - Enable heartbeats on the
2315 * specified address. Note that if the address
2316 * field is empty all addresses for the association
2317 * have heartbeats enabled upon them.
2319 * SPP_HB_DISABLE - Disable heartbeats on the
2320 * speicifed address. Note that if the address
2321 * field is empty all addresses for the association
2322 * will have their heartbeats disabled. Note also
2323 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2324 * mutually exclusive, only one of these two should
2325 * be specified. Enabling both fields will have
2326 * undetermined results.
2328 * SPP_HB_DEMAND - Request a user initiated heartbeat
2329 * to be made immediately.
2331 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2332 * heartbeat delayis to be set to the value of 0
2335 * SPP_PMTUD_ENABLE - This field will enable PMTU
2336 * discovery upon the specified address. Note that
2337 * if the address feild is empty then all addresses
2338 * on the association are effected.
2340 * SPP_PMTUD_DISABLE - This field will disable PMTU
2341 * discovery upon the specified address. Note that
2342 * if the address feild is empty then all addresses
2343 * on the association are effected. Not also that
2344 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2345 * exclusive. Enabling both will have undetermined
2348 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2349 * on delayed sack. The time specified in spp_sackdelay
2350 * is used to specify the sack delay for this address. Note
2351 * that if spp_address is empty then all addresses will
2352 * enable delayed sack and take on the sack delay
2353 * value specified in spp_sackdelay.
2354 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2355 * off delayed sack. If the spp_address field is blank then
2356 * delayed sack is disabled for the entire association. Note
2357 * also that this field is mutually exclusive to
2358 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2361 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2362 * setting of the IPV6 flow label value. The value is
2363 * contained in the spp_ipv6_flowlabel field.
2364 * Upon retrieval, this flag will be set to indicate that
2365 * the spp_ipv6_flowlabel field has a valid value returned.
2366 * If a specific destination address is set (in the
2367 * spp_address field), then the value returned is that of
2368 * the address. If just an association is specified (and
2369 * no address), then the association's default flow label
2370 * is returned. If neither an association nor a destination
2371 * is specified, then the socket's default flow label is
2372 * returned. For non-IPv6 sockets, this flag will be left
2375 * SPP_DSCP: Setting this flag enables the setting of the
2376 * Differentiated Services Code Point (DSCP) value
2377 * associated with either the association or a specific
2378 * address. The value is obtained in the spp_dscp field.
2379 * Upon retrieval, this flag will be set to indicate that
2380 * the spp_dscp field has a valid value returned. If a
2381 * specific destination address is set when called (in the
2382 * spp_address field), then that specific destination
2383 * address's DSCP value is returned. If just an association
2384 * is specified, then the association's default DSCP is
2385 * returned. If neither an association nor a destination is
2386 * specified, then the socket's default DSCP is returned.
2388 * spp_ipv6_flowlabel
2389 * - This field is used in conjunction with the
2390 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2391 * The 20 least significant bits are used for the flow
2392 * label. This setting has precedence over any IPv6-layer
2395 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2396 * and contains the DSCP. The 6 most significant bits are
2397 * used for the DSCP. This setting has precedence over any
2398 * IPv4- or IPv6- layer setting.
2400 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2401 struct sctp_transport *trans,
2402 struct sctp_association *asoc,
2403 struct sctp_sock *sp,
2406 int sackdelay_change)
2410 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2411 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2412 trans->asoc, trans);
2417 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2418 * this field is ignored. Note also that a value of zero indicates
2419 * the current setting should be left unchanged.
2421 if (params->spp_flags & SPP_HB_ENABLE) {
2423 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2424 * set. This lets us use 0 value when this flag
2427 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2428 params->spp_hbinterval = 0;
2430 if (params->spp_hbinterval ||
2431 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2434 msecs_to_jiffies(params->spp_hbinterval);
2437 msecs_to_jiffies(params->spp_hbinterval);
2439 sp->hbinterval = params->spp_hbinterval;
2446 trans->param_flags =
2447 (trans->param_flags & ~SPP_HB) | hb_change;
2450 (asoc->param_flags & ~SPP_HB) | hb_change;
2453 (sp->param_flags & ~SPP_HB) | hb_change;
2457 /* When Path MTU discovery is disabled the value specified here will
2458 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2459 * include the flag SPP_PMTUD_DISABLE for this field to have any
2462 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2464 trans->pathmtu = params->spp_pathmtu;
2465 sctp_assoc_sync_pmtu(asoc);
2467 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2469 sp->pathmtu = params->spp_pathmtu;
2475 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2476 (params->spp_flags & SPP_PMTUD_ENABLE);
2477 trans->param_flags =
2478 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2480 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2481 sctp_assoc_sync_pmtu(asoc);
2485 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2488 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2492 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2493 * value of this field is ignored. Note also that a value of zero
2494 * indicates the current setting should be left unchanged.
2496 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2499 msecs_to_jiffies(params->spp_sackdelay);
2502 msecs_to_jiffies(params->spp_sackdelay);
2504 sp->sackdelay = params->spp_sackdelay;
2508 if (sackdelay_change) {
2510 trans->param_flags =
2511 (trans->param_flags & ~SPP_SACKDELAY) |
2515 (asoc->param_flags & ~SPP_SACKDELAY) |
2519 (sp->param_flags & ~SPP_SACKDELAY) |
2524 /* Note that a value of zero indicates the current setting should be
2527 if (params->spp_pathmaxrxt) {
2529 trans->pathmaxrxt = params->spp_pathmaxrxt;
2531 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2533 sp->pathmaxrxt = params->spp_pathmaxrxt;
2537 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2539 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2540 trans->flowlabel = params->spp_ipv6_flowlabel &
2541 SCTP_FLOWLABEL_VAL_MASK;
2542 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2545 struct sctp_transport *t;
2547 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2549 if (t->ipaddr.sa.sa_family != AF_INET6)
2551 t->flowlabel = params->spp_ipv6_flowlabel &
2552 SCTP_FLOWLABEL_VAL_MASK;
2553 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2555 asoc->flowlabel = params->spp_ipv6_flowlabel &
2556 SCTP_FLOWLABEL_VAL_MASK;
2557 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2558 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2559 sp->flowlabel = params->spp_ipv6_flowlabel &
2560 SCTP_FLOWLABEL_VAL_MASK;
2561 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2565 if (params->spp_flags & SPP_DSCP) {
2567 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2568 trans->dscp |= SCTP_DSCP_SET_MASK;
2570 struct sctp_transport *t;
2572 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2574 t->dscp = params->spp_dscp &
2576 t->dscp |= SCTP_DSCP_SET_MASK;
2578 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2579 asoc->dscp |= SCTP_DSCP_SET_MASK;
2581 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2582 sp->dscp |= SCTP_DSCP_SET_MASK;
2589 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2590 struct sctp_paddrparams *params,
2591 unsigned int optlen)
2593 struct sctp_transport *trans = NULL;
2594 struct sctp_association *asoc = NULL;
2595 struct sctp_sock *sp = sctp_sk(sk);
2597 int hb_change, pmtud_change, sackdelay_change;
2599 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2600 spp_ipv6_flowlabel), 4)) {
2601 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2603 } else if (optlen != sizeof(*params)) {
2607 /* Validate flags and value parameters. */
2608 hb_change = params->spp_flags & SPP_HB;
2609 pmtud_change = params->spp_flags & SPP_PMTUD;
2610 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2612 if (hb_change == SPP_HB ||
2613 pmtud_change == SPP_PMTUD ||
2614 sackdelay_change == SPP_SACKDELAY ||
2615 params->spp_sackdelay > 500 ||
2616 (params->spp_pathmtu &&
2617 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2620 /* If an address other than INADDR_ANY is specified, and
2621 * no transport is found, then the request is invalid.
2623 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2624 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2625 params->spp_assoc_id);
2630 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2631 * socket is a one to many style socket, and an association
2632 * was not found, then the id was invalid.
2634 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2635 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2636 sctp_style(sk, UDP))
2639 /* Heartbeat demand can only be sent on a transport or
2640 * association, but not a socket.
2642 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2645 /* Process parameters. */
2646 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2647 hb_change, pmtud_change,
2653 /* If changes are for association, also apply parameters to each
2656 if (!trans && asoc) {
2657 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2659 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2660 hb_change, pmtud_change,
2668 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2670 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2673 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2675 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2678 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2679 struct sctp_association *asoc)
2681 struct sctp_transport *trans;
2683 if (params->sack_delay) {
2684 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2686 sctp_spp_sackdelay_enable(asoc->param_flags);
2688 if (params->sack_freq == 1) {
2690 sctp_spp_sackdelay_disable(asoc->param_flags);
2691 } else if (params->sack_freq > 1) {
2692 asoc->sackfreq = params->sack_freq;
2694 sctp_spp_sackdelay_enable(asoc->param_flags);
2697 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2699 if (params->sack_delay) {
2700 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2701 trans->param_flags =
2702 sctp_spp_sackdelay_enable(trans->param_flags);
2704 if (params->sack_freq == 1) {
2705 trans->param_flags =
2706 sctp_spp_sackdelay_disable(trans->param_flags);
2707 } else if (params->sack_freq > 1) {
2708 trans->sackfreq = params->sack_freq;
2709 trans->param_flags =
2710 sctp_spp_sackdelay_enable(trans->param_flags);
2716 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2718 * This option will effect the way delayed acks are performed. This
2719 * option allows you to get or set the delayed ack time, in
2720 * milliseconds. It also allows changing the delayed ack frequency.
2721 * Changing the frequency to 1 disables the delayed sack algorithm. If
2722 * the assoc_id is 0, then this sets or gets the endpoints default
2723 * values. If the assoc_id field is non-zero, then the set or get
2724 * effects the specified association for the one to many model (the
2725 * assoc_id field is ignored by the one to one model). Note that if
2726 * sack_delay or sack_freq are 0 when setting this option, then the
2727 * current values will remain unchanged.
2729 * struct sctp_sack_info {
2730 * sctp_assoc_t sack_assoc_id;
2731 * uint32_t sack_delay;
2732 * uint32_t sack_freq;
2735 * sack_assoc_id - This parameter, indicates which association the user
2736 * is performing an action upon. Note that if this field's value is
2737 * zero then the endpoints default value is changed (effecting future
2738 * associations only).
2740 * sack_delay - This parameter contains the number of milliseconds that
2741 * the user is requesting the delayed ACK timer be set to. Note that
2742 * this value is defined in the standard to be between 200 and 500
2745 * sack_freq - This parameter contains the number of packets that must
2746 * be received before a sack is sent without waiting for the delay
2747 * timer to expire. The default value for this is 2, setting this
2748 * value to 1 will disable the delayed sack algorithm.
2750 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2751 struct sctp_sack_info *params)
2753 struct sctp_sock *sp = sctp_sk(sk);
2754 struct sctp_association *asoc;
2756 /* Validate value parameter. */
2757 if (params->sack_delay > 500)
2760 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2761 * socket is a one to many style socket, and an association
2762 * was not found, then the id was invalid.
2764 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2765 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2766 sctp_style(sk, UDP))
2770 sctp_apply_asoc_delayed_ack(params, asoc);
2775 if (sctp_style(sk, TCP))
2776 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2778 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2779 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2780 if (params->sack_delay) {
2781 sp->sackdelay = params->sack_delay;
2783 sctp_spp_sackdelay_enable(sp->param_flags);
2785 if (params->sack_freq == 1) {
2787 sctp_spp_sackdelay_disable(sp->param_flags);
2788 } else if (params->sack_freq > 1) {
2789 sp->sackfreq = params->sack_freq;
2791 sctp_spp_sackdelay_enable(sp->param_flags);
2795 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2796 params->sack_assoc_id == SCTP_ALL_ASSOC)
2797 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2798 sctp_apply_asoc_delayed_ack(params, asoc);
2803 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2804 struct sctp_sack_info *params,
2805 unsigned int optlen)
2807 if (optlen == sizeof(struct sctp_assoc_value)) {
2808 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2809 struct sctp_sack_info p;
2811 pr_warn_ratelimited(DEPRECATED
2813 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2814 "Use struct sctp_sack_info instead\n",
2815 current->comm, task_pid_nr(current));
2817 p.sack_assoc_id = v->assoc_id;
2818 p.sack_delay = v->assoc_value;
2819 p.sack_freq = v->assoc_value ? 0 : 1;
2820 return __sctp_setsockopt_delayed_ack(sk, &p);
2823 if (optlen != sizeof(struct sctp_sack_info))
2825 if (params->sack_delay == 0 && params->sack_freq == 0)
2827 return __sctp_setsockopt_delayed_ack(sk, params);
2830 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2832 * Applications can specify protocol parameters for the default association
2833 * initialization. The option name argument to setsockopt() and getsockopt()
2836 * Setting initialization parameters is effective only on an unconnected
2837 * socket (for UDP-style sockets only future associations are effected
2838 * by the change). With TCP-style sockets, this option is inherited by
2839 * sockets derived from a listener socket.
2841 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2842 unsigned int optlen)
2844 struct sctp_sock *sp = sctp_sk(sk);
2846 if (optlen != sizeof(struct sctp_initmsg))
2849 if (sinit->sinit_num_ostreams)
2850 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2851 if (sinit->sinit_max_instreams)
2852 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2853 if (sinit->sinit_max_attempts)
2854 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2855 if (sinit->sinit_max_init_timeo)
2856 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2862 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2864 * Applications that wish to use the sendto() system call may wish to
2865 * specify a default set of parameters that would normally be supplied
2866 * through the inclusion of ancillary data. This socket option allows
2867 * such an application to set the default sctp_sndrcvinfo structure.
2868 * The application that wishes to use this socket option simply passes
2869 * in to this call the sctp_sndrcvinfo structure defined in Section
2870 * 5.2.2) The input parameters accepted by this call include
2871 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2872 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2873 * to this call if the caller is using the UDP model.
2875 static int sctp_setsockopt_default_send_param(struct sock *sk,
2876 struct sctp_sndrcvinfo *info,
2877 unsigned int optlen)
2879 struct sctp_sock *sp = sctp_sk(sk);
2880 struct sctp_association *asoc;
2882 if (optlen != sizeof(*info))
2884 if (info->sinfo_flags &
2885 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2886 SCTP_ABORT | SCTP_EOF))
2889 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2890 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2891 sctp_style(sk, UDP))
2895 asoc->default_stream = info->sinfo_stream;
2896 asoc->default_flags = info->sinfo_flags;
2897 asoc->default_ppid = info->sinfo_ppid;
2898 asoc->default_context = info->sinfo_context;
2899 asoc->default_timetolive = info->sinfo_timetolive;
2904 if (sctp_style(sk, TCP))
2905 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2907 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2908 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2909 sp->default_stream = info->sinfo_stream;
2910 sp->default_flags = info->sinfo_flags;
2911 sp->default_ppid = info->sinfo_ppid;
2912 sp->default_context = info->sinfo_context;
2913 sp->default_timetolive = info->sinfo_timetolive;
2916 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2917 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2918 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2919 asoc->default_stream = info->sinfo_stream;
2920 asoc->default_flags = info->sinfo_flags;
2921 asoc->default_ppid = info->sinfo_ppid;
2922 asoc->default_context = info->sinfo_context;
2923 asoc->default_timetolive = info->sinfo_timetolive;
2930 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2931 * (SCTP_DEFAULT_SNDINFO)
2933 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2934 struct sctp_sndinfo *info,
2935 unsigned int optlen)
2937 struct sctp_sock *sp = sctp_sk(sk);
2938 struct sctp_association *asoc;
2940 if (optlen != sizeof(*info))
2942 if (info->snd_flags &
2943 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2944 SCTP_ABORT | SCTP_EOF))
2947 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2948 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2949 sctp_style(sk, UDP))
2953 asoc->default_stream = info->snd_sid;
2954 asoc->default_flags = info->snd_flags;
2955 asoc->default_ppid = info->snd_ppid;
2956 asoc->default_context = info->snd_context;
2961 if (sctp_style(sk, TCP))
2962 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2964 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2965 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2966 sp->default_stream = info->snd_sid;
2967 sp->default_flags = info->snd_flags;
2968 sp->default_ppid = info->snd_ppid;
2969 sp->default_context = info->snd_context;
2972 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2973 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2974 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2975 asoc->default_stream = info->snd_sid;
2976 asoc->default_flags = info->snd_flags;
2977 asoc->default_ppid = info->snd_ppid;
2978 asoc->default_context = info->snd_context;
2985 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2987 * Requests that the local SCTP stack use the enclosed peer address as
2988 * the association primary. The enclosed address must be one of the
2989 * association peer's addresses.
2991 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
2992 unsigned int optlen)
2994 struct sctp_transport *trans;
2998 if (optlen != sizeof(struct sctp_prim))
3001 /* Allow security module to validate address but need address len. */
3002 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3006 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3007 (struct sockaddr *)&prim->ssp_addr,
3012 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3016 sctp_assoc_set_primary(trans->asoc, trans);
3022 * 7.1.5 SCTP_NODELAY
3024 * Turn on/off any Nagle-like algorithm. This means that packets are
3025 * generally sent as soon as possible and no unnecessary delays are
3026 * introduced, at the cost of more packets in the network. Expects an
3027 * integer boolean flag.
3029 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3030 unsigned int optlen)
3032 if (optlen < sizeof(int))
3034 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3040 * 7.1.1 SCTP_RTOINFO
3042 * The protocol parameters used to initialize and bound retransmission
3043 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3044 * and modify these parameters.
3045 * All parameters are time values, in milliseconds. A value of 0, when
3046 * modifying the parameters, indicates that the current value should not
3050 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3051 struct sctp_rtoinfo *rtoinfo,
3052 unsigned int optlen)
3054 struct sctp_association *asoc;
3055 unsigned long rto_min, rto_max;
3056 struct sctp_sock *sp = sctp_sk(sk);
3058 if (optlen != sizeof (struct sctp_rtoinfo))
3061 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3063 /* Set the values to the specific association */
3064 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3065 sctp_style(sk, UDP))
3068 rto_max = rtoinfo->srto_max;
3069 rto_min = rtoinfo->srto_min;
3072 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3074 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3077 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3079 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3081 if (rto_min > rto_max)
3085 if (rtoinfo->srto_initial != 0)
3087 msecs_to_jiffies(rtoinfo->srto_initial);
3088 asoc->rto_max = rto_max;
3089 asoc->rto_min = rto_min;
3091 /* If there is no association or the association-id = 0
3092 * set the values to the endpoint.
3094 if (rtoinfo->srto_initial != 0)
3095 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3096 sp->rtoinfo.srto_max = rto_max;
3097 sp->rtoinfo.srto_min = rto_min;
3105 * 7.1.2 SCTP_ASSOCINFO
3107 * This option is used to tune the maximum retransmission attempts
3108 * of the association.
3109 * Returns an error if the new association retransmission value is
3110 * greater than the sum of the retransmission value of the peer.
3111 * See [SCTP] for more information.
3114 static int sctp_setsockopt_associnfo(struct sock *sk,
3115 struct sctp_assocparams *assocparams,
3116 unsigned int optlen)
3119 struct sctp_association *asoc;
3121 if (optlen != sizeof(struct sctp_assocparams))
3124 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3126 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3127 sctp_style(sk, UDP))
3130 /* Set the values to the specific association */
3132 if (assocparams->sasoc_asocmaxrxt != 0) {
3135 struct sctp_transport *peer_addr;
3137 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3139 path_sum += peer_addr->pathmaxrxt;
3143 /* Only validate asocmaxrxt if we have more than
3144 * one path/transport. We do this because path
3145 * retransmissions are only counted when we have more
3149 assocparams->sasoc_asocmaxrxt > path_sum)
3152 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3155 if (assocparams->sasoc_cookie_life != 0)
3157 ms_to_ktime(assocparams->sasoc_cookie_life);
3159 /* Set the values to the endpoint */
3160 struct sctp_sock *sp = sctp_sk(sk);
3162 if (assocparams->sasoc_asocmaxrxt != 0)
3163 sp->assocparams.sasoc_asocmaxrxt =
3164 assocparams->sasoc_asocmaxrxt;
3165 if (assocparams->sasoc_cookie_life != 0)
3166 sp->assocparams.sasoc_cookie_life =
3167 assocparams->sasoc_cookie_life;
3173 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3175 * This socket option is a boolean flag which turns on or off mapped V4
3176 * addresses. If this option is turned on and the socket is type
3177 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3178 * If this option is turned off, then no mapping will be done of V4
3179 * addresses and a user will receive both PF_INET6 and PF_INET type
3180 * addresses on the socket.
3182 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3183 unsigned int optlen)
3185 struct sctp_sock *sp = sctp_sk(sk);
3187 if (optlen < sizeof(int))
3198 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3199 * This option will get or set the maximum size to put in any outgoing
3200 * SCTP DATA chunk. If a message is larger than this size it will be
3201 * fragmented by SCTP into the specified size. Note that the underlying
3202 * SCTP implementation may fragment into smaller sized chunks when the
3203 * PMTU of the underlying association is smaller than the value set by
3204 * the user. The default value for this option is '0' which indicates
3205 * the user is NOT limiting fragmentation and only the PMTU will effect
3206 * SCTP's choice of DATA chunk size. Note also that values set larger
3207 * than the maximum size of an IP datagram will effectively let SCTP
3208 * control fragmentation (i.e. the same as setting this option to 0).
3210 * The following structure is used to access and modify this parameter:
3212 * struct sctp_assoc_value {
3213 * sctp_assoc_t assoc_id;
3214 * uint32_t assoc_value;
3217 * assoc_id: This parameter is ignored for one-to-one style sockets.
3218 * For one-to-many style sockets this parameter indicates which
3219 * association the user is performing an action upon. Note that if
3220 * this field's value is zero then the endpoints default value is
3221 * changed (effecting future associations only).
3222 * assoc_value: This parameter specifies the maximum size in bytes.
3224 static int sctp_setsockopt_maxseg(struct sock *sk,
3225 struct sctp_assoc_value *params,
3226 unsigned int optlen)
3228 struct sctp_sock *sp = sctp_sk(sk);
3229 struct sctp_association *asoc;
3230 sctp_assoc_t assoc_id;
3233 if (optlen == sizeof(int)) {
3234 pr_warn_ratelimited(DEPRECATED
3236 "Use of int in maxseg socket option.\n"
3237 "Use struct sctp_assoc_value instead\n",
3238 current->comm, task_pid_nr(current));
3239 assoc_id = SCTP_FUTURE_ASSOC;
3240 val = *(int *)params;
3241 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3242 assoc_id = params->assoc_id;
3243 val = params->assoc_value;
3248 asoc = sctp_id2assoc(sk, assoc_id);
3249 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3250 sctp_style(sk, UDP))
3254 int min_len, max_len;
3255 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3256 sizeof(struct sctp_data_chunk);
3258 min_len = sctp_min_frag_point(sp, datasize);
3259 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3261 if (val < min_len || val > max_len)
3266 asoc->user_frag = val;
3267 sctp_assoc_update_frag_point(asoc);
3269 sp->user_frag = val;
3277 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3279 * Requests that the peer mark the enclosed address as the association
3280 * primary. The enclosed address must be one of the association's
3281 * locally bound addresses. The following structure is used to make a
3282 * set primary request:
3284 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3285 struct sctp_setpeerprim *prim,
3286 unsigned int optlen)
3288 struct sctp_sock *sp;
3289 struct sctp_association *asoc = NULL;
3290 struct sctp_chunk *chunk;
3296 if (!sp->ep->asconf_enable)
3299 if (optlen != sizeof(struct sctp_setpeerprim))
3302 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3306 if (!asoc->peer.asconf_capable)
3309 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3312 if (!sctp_state(asoc, ESTABLISHED))
3315 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3319 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3320 return -EADDRNOTAVAIL;
3322 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3323 return -EADDRNOTAVAIL;
3325 /* Allow security module to validate address. */
3326 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3327 (struct sockaddr *)&prim->sspp_addr,
3332 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3333 chunk = sctp_make_asconf_set_prim(asoc,
3334 (union sctp_addr *)&prim->sspp_addr);
3338 err = sctp_send_asconf(asoc, chunk);
3340 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3345 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3346 struct sctp_setadaptation *adapt,
3347 unsigned int optlen)
3349 if (optlen != sizeof(struct sctp_setadaptation))
3352 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3358 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3360 * The context field in the sctp_sndrcvinfo structure is normally only
3361 * used when a failed message is retrieved holding the value that was
3362 * sent down on the actual send call. This option allows the setting of
3363 * a default context on an association basis that will be received on
3364 * reading messages from the peer. This is especially helpful in the
3365 * one-2-many model for an application to keep some reference to an
3366 * internal state machine that is processing messages on the
3367 * association. Note that the setting of this value only effects
3368 * received messages from the peer and does not effect the value that is
3369 * saved with outbound messages.
3371 static int sctp_setsockopt_context(struct sock *sk,
3372 struct sctp_assoc_value *params,
3373 unsigned int optlen)
3375 struct sctp_sock *sp = sctp_sk(sk);
3376 struct sctp_association *asoc;
3378 if (optlen != sizeof(struct sctp_assoc_value))
3381 asoc = sctp_id2assoc(sk, params->assoc_id);
3382 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3383 sctp_style(sk, UDP))
3387 asoc->default_rcv_context = params->assoc_value;
3392 if (sctp_style(sk, TCP))
3393 params->assoc_id = SCTP_FUTURE_ASSOC;
3395 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3396 params->assoc_id == SCTP_ALL_ASSOC)
3397 sp->default_rcv_context = params->assoc_value;
3399 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3400 params->assoc_id == SCTP_ALL_ASSOC)
3401 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3402 asoc->default_rcv_context = params->assoc_value;
3408 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3410 * This options will at a minimum specify if the implementation is doing
3411 * fragmented interleave. Fragmented interleave, for a one to many
3412 * socket, is when subsequent calls to receive a message may return
3413 * parts of messages from different associations. Some implementations
3414 * may allow you to turn this value on or off. If so, when turned off,
3415 * no fragment interleave will occur (which will cause a head of line
3416 * blocking amongst multiple associations sharing the same one to many
3417 * socket). When this option is turned on, then each receive call may
3418 * come from a different association (thus the user must receive data
3419 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3420 * association each receive belongs to.
3422 * This option takes a boolean value. A non-zero value indicates that
3423 * fragmented interleave is on. A value of zero indicates that
3424 * fragmented interleave is off.
3426 * Note that it is important that an implementation that allows this
3427 * option to be turned on, have it off by default. Otherwise an unaware
3428 * application using the one to many model may become confused and act
3431 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3432 unsigned int optlen)
3434 if (optlen != sizeof(int))
3437 sctp_sk(sk)->frag_interleave = !!*val;
3439 if (!sctp_sk(sk)->frag_interleave)
3440 sctp_sk(sk)->ep->intl_enable = 0;
3446 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3447 * (SCTP_PARTIAL_DELIVERY_POINT)
3449 * This option will set or get the SCTP partial delivery point. This
3450 * point is the size of a message where the partial delivery API will be
3451 * invoked to help free up rwnd space for the peer. Setting this to a
3452 * lower value will cause partial deliveries to happen more often. The
3453 * calls argument is an integer that sets or gets the partial delivery
3454 * point. Note also that the call will fail if the user attempts to set
3455 * this value larger than the socket receive buffer size.
3457 * Note that any single message having a length smaller than or equal to
3458 * the SCTP partial delivery point will be delivered in one single read
3459 * call as long as the user provided buffer is large enough to hold the
3462 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3463 unsigned int optlen)
3465 if (optlen != sizeof(u32))
3468 /* Note: We double the receive buffer from what the user sets
3469 * it to be, also initial rwnd is based on rcvbuf/2.
3471 if (*val > (sk->sk_rcvbuf >> 1))
3474 sctp_sk(sk)->pd_point = *val;
3476 return 0; /* is this the right error code? */
3480 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3482 * This option will allow a user to change the maximum burst of packets
3483 * that can be emitted by this association. Note that the default value
3484 * is 4, and some implementations may restrict this setting so that it
3485 * can only be lowered.
3487 * NOTE: This text doesn't seem right. Do this on a socket basis with
3488 * future associations inheriting the socket value.
3490 static int sctp_setsockopt_maxburst(struct sock *sk,
3491 struct sctp_assoc_value *params,
3492 unsigned int optlen)
3494 struct sctp_sock *sp = sctp_sk(sk);
3495 struct sctp_association *asoc;
3496 sctp_assoc_t assoc_id;
3499 if (optlen == sizeof(int)) {
3500 pr_warn_ratelimited(DEPRECATED
3502 "Use of int in max_burst socket option deprecated.\n"
3503 "Use struct sctp_assoc_value instead\n",
3504 current->comm, task_pid_nr(current));
3505 assoc_id = SCTP_FUTURE_ASSOC;
3506 assoc_value = *((int *)params);
3507 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3508 assoc_id = params->assoc_id;
3509 assoc_value = params->assoc_value;
3513 asoc = sctp_id2assoc(sk, assoc_id);
3514 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3518 asoc->max_burst = assoc_value;
3523 if (sctp_style(sk, TCP))
3524 assoc_id = SCTP_FUTURE_ASSOC;
3526 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3527 sp->max_burst = assoc_value;
3529 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3530 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3531 asoc->max_burst = assoc_value;
3537 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3539 * This set option adds a chunk type that the user is requesting to be
3540 * received only in an authenticated way. Changes to the list of chunks
3541 * will only effect future associations on the socket.
3543 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3544 struct sctp_authchunk *val,
3545 unsigned int optlen)
3547 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3549 if (!ep->auth_enable)
3552 if (optlen != sizeof(struct sctp_authchunk))
3555 switch (val->sauth_chunk) {
3557 case SCTP_CID_INIT_ACK:
3558 case SCTP_CID_SHUTDOWN_COMPLETE:
3563 /* add this chunk id to the endpoint */
3564 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3568 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3570 * This option gets or sets the list of HMAC algorithms that the local
3571 * endpoint requires the peer to use.
3573 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3574 struct sctp_hmacalgo *hmacs,
3575 unsigned int optlen)
3577 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3580 if (!ep->auth_enable)
3583 if (optlen < sizeof(struct sctp_hmacalgo))
3585 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3586 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3588 idents = hmacs->shmac_num_idents;
3589 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3590 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3593 return sctp_auth_ep_set_hmacs(ep, hmacs);
3597 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3599 * This option will set a shared secret key which is used to build an
3600 * association shared key.
3602 static int sctp_setsockopt_auth_key(struct sock *sk,
3603 struct sctp_authkey *authkey,
3604 unsigned int optlen)
3606 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3607 struct sctp_association *asoc;
3610 if (optlen <= sizeof(struct sctp_authkey))
3612 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3615 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3617 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3620 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3621 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3622 sctp_style(sk, UDP))
3626 ret = sctp_auth_set_key(ep, asoc, authkey);
3630 if (sctp_style(sk, TCP))
3631 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3633 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3634 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3635 ret = sctp_auth_set_key(ep, asoc, authkey);
3642 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3643 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3644 list_for_each_entry(asoc, &ep->asocs, asocs) {
3645 int res = sctp_auth_set_key(ep, asoc, authkey);
3653 memzero_explicit(authkey, optlen);
3658 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3660 * This option will get or set the active shared key to be used to build
3661 * the association shared key.
3663 static int sctp_setsockopt_active_key(struct sock *sk,
3664 struct sctp_authkeyid *val,
3665 unsigned int optlen)
3667 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3668 struct sctp_association *asoc;
3671 if (optlen != sizeof(struct sctp_authkeyid))
3674 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3675 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3676 sctp_style(sk, UDP))
3680 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3682 if (sctp_style(sk, TCP))
3683 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3685 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3686 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3687 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3692 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3693 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3694 list_for_each_entry(asoc, &ep->asocs, asocs) {
3695 int res = sctp_auth_set_active_key(ep, asoc,
3696 val->scact_keynumber);
3707 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3709 * This set option will delete a shared secret key from use.
3711 static int sctp_setsockopt_del_key(struct sock *sk,
3712 struct sctp_authkeyid *val,
3713 unsigned int optlen)
3715 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3716 struct sctp_association *asoc;
3719 if (optlen != sizeof(struct sctp_authkeyid))
3722 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3723 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3724 sctp_style(sk, UDP))
3728 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3730 if (sctp_style(sk, TCP))
3731 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3733 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3734 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3735 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3740 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3741 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3742 list_for_each_entry(asoc, &ep->asocs, asocs) {
3743 int res = sctp_auth_del_key_id(ep, asoc,
3744 val->scact_keynumber);
3755 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3757 * This set option will deactivate a shared secret key.
3759 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3760 struct sctp_authkeyid *val,
3761 unsigned int optlen)
3763 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3764 struct sctp_association *asoc;
3767 if (optlen != sizeof(struct sctp_authkeyid))
3770 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3771 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3772 sctp_style(sk, UDP))
3776 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3778 if (sctp_style(sk, TCP))
3779 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3781 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3782 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3783 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3788 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3789 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3790 list_for_each_entry(asoc, &ep->asocs, asocs) {
3791 int res = sctp_auth_deact_key_id(ep, asoc,
3792 val->scact_keynumber);
3803 * 8.1.23 SCTP_AUTO_ASCONF
3805 * This option will enable or disable the use of the automatic generation of
3806 * ASCONF chunks to add and delete addresses to an existing association. Note
3807 * that this option has two caveats namely: a) it only affects sockets that
3808 * are bound to all addresses available to the SCTP stack, and b) the system
3809 * administrator may have an overriding control that turns the ASCONF feature
3810 * off no matter what setting the socket option may have.
3811 * This option expects an integer boolean flag, where a non-zero value turns on
3812 * the option, and a zero value turns off the option.
3813 * Note. In this implementation, socket operation overrides default parameter
3814 * being set by sysctl as well as FreeBSD implementation
3816 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3817 unsigned int optlen)
3819 struct sctp_sock *sp = sctp_sk(sk);
3821 if (optlen < sizeof(int))
3823 if (!sctp_is_ep_boundall(sk) && *val)
3825 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3828 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3829 if (*val == 0 && sp->do_auto_asconf) {
3830 list_del(&sp->auto_asconf_list);
3831 sp->do_auto_asconf = 0;
3832 } else if (*val && !sp->do_auto_asconf) {
3833 list_add_tail(&sp->auto_asconf_list,
3834 &sock_net(sk)->sctp.auto_asconf_splist);
3835 sp->do_auto_asconf = 1;
3837 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3842 * SCTP_PEER_ADDR_THLDS
3844 * This option allows us to alter the partially failed threshold for one or all
3845 * transports in an association. See Section 6.1 of:
3846 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3848 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3849 struct sctp_paddrthlds_v2 *val,
3850 unsigned int optlen, bool v2)
3852 struct sctp_transport *trans;
3853 struct sctp_association *asoc;
3856 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3860 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3863 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3864 trans = sctp_addr_id2transport(sk, &val->spt_address,
3869 if (val->spt_pathmaxrxt)
3870 trans->pathmaxrxt = val->spt_pathmaxrxt;
3872 trans->ps_retrans = val->spt_pathcpthld;
3873 trans->pf_retrans = val->spt_pathpfthld;
3878 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3879 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3880 sctp_style(sk, UDP))
3884 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3886 if (val->spt_pathmaxrxt)
3887 trans->pathmaxrxt = val->spt_pathmaxrxt;
3889 trans->ps_retrans = val->spt_pathcpthld;
3890 trans->pf_retrans = val->spt_pathpfthld;
3893 if (val->spt_pathmaxrxt)
3894 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3896 asoc->ps_retrans = val->spt_pathcpthld;
3897 asoc->pf_retrans = val->spt_pathpfthld;
3899 struct sctp_sock *sp = sctp_sk(sk);
3901 if (val->spt_pathmaxrxt)
3902 sp->pathmaxrxt = val->spt_pathmaxrxt;
3904 sp->ps_retrans = val->spt_pathcpthld;
3905 sp->pf_retrans = val->spt_pathpfthld;
3911 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3912 unsigned int optlen)
3914 if (optlen < sizeof(int))
3917 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3922 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3923 unsigned int optlen)
3925 if (optlen < sizeof(int))
3928 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3933 static int sctp_setsockopt_pr_supported(struct sock *sk,
3934 struct sctp_assoc_value *params,
3935 unsigned int optlen)
3937 struct sctp_association *asoc;
3939 if (optlen != sizeof(*params))
3942 asoc = sctp_id2assoc(sk, params->assoc_id);
3943 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3944 sctp_style(sk, UDP))
3947 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3952 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3953 struct sctp_default_prinfo *info,
3954 unsigned int optlen)
3956 struct sctp_sock *sp = sctp_sk(sk);
3957 struct sctp_association *asoc;
3958 int retval = -EINVAL;
3960 if (optlen != sizeof(*info))
3963 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3966 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3969 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3970 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3971 sctp_style(sk, UDP))
3977 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3978 asoc->default_timetolive = info->pr_value;
3982 if (sctp_style(sk, TCP))
3983 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
3985 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
3986 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3987 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
3988 sp->default_timetolive = info->pr_value;
3991 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
3992 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3993 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3994 SCTP_PR_SET_POLICY(asoc->default_flags,
3996 asoc->default_timetolive = info->pr_value;
4004 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4005 struct sctp_assoc_value *params,
4006 unsigned int optlen)
4008 struct sctp_association *asoc;
4009 int retval = -EINVAL;
4011 if (optlen != sizeof(*params))
4014 asoc = sctp_id2assoc(sk, params->assoc_id);
4015 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4016 sctp_style(sk, UDP))
4019 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4027 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4028 struct sctp_assoc_value *params,
4029 unsigned int optlen)
4031 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4032 struct sctp_association *asoc;
4033 int retval = -EINVAL;
4035 if (optlen != sizeof(*params))
4038 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4041 asoc = sctp_id2assoc(sk, params->assoc_id);
4042 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4043 sctp_style(sk, UDP))
4049 asoc->strreset_enable = params->assoc_value;
4053 if (sctp_style(sk, TCP))
4054 params->assoc_id = SCTP_FUTURE_ASSOC;
4056 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4057 params->assoc_id == SCTP_ALL_ASSOC)
4058 ep->strreset_enable = params->assoc_value;
4060 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4061 params->assoc_id == SCTP_ALL_ASSOC)
4062 list_for_each_entry(asoc, &ep->asocs, asocs)
4063 asoc->strreset_enable = params->assoc_value;
4069 static int sctp_setsockopt_reset_streams(struct sock *sk,
4070 struct sctp_reset_streams *params,
4071 unsigned int optlen)
4073 struct sctp_association *asoc;
4075 if (optlen < sizeof(*params))
4077 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4078 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4079 sizeof(__u16) * sizeof(*params));
4081 if (params->srs_number_streams * sizeof(__u16) >
4082 optlen - sizeof(*params))
4085 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4089 return sctp_send_reset_streams(asoc, params);
4092 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4093 unsigned int optlen)
4095 struct sctp_association *asoc;
4097 if (optlen != sizeof(*associd))
4100 asoc = sctp_id2assoc(sk, *associd);
4104 return sctp_send_reset_assoc(asoc);
4107 static int sctp_setsockopt_add_streams(struct sock *sk,
4108 struct sctp_add_streams *params,
4109 unsigned int optlen)
4111 struct sctp_association *asoc;
4113 if (optlen != sizeof(*params))
4116 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4120 return sctp_send_add_streams(asoc, params);
4123 static int sctp_setsockopt_scheduler(struct sock *sk,
4124 struct sctp_assoc_value *params,
4125 unsigned int optlen)
4127 struct sctp_sock *sp = sctp_sk(sk);
4128 struct sctp_association *asoc;
4131 if (optlen < sizeof(*params))
4134 if (params->assoc_value > SCTP_SS_MAX)
4137 asoc = sctp_id2assoc(sk, params->assoc_id);
4138 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4139 sctp_style(sk, UDP))
4143 return sctp_sched_set_sched(asoc, params->assoc_value);
4145 if (sctp_style(sk, TCP))
4146 params->assoc_id = SCTP_FUTURE_ASSOC;
4148 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4149 params->assoc_id == SCTP_ALL_ASSOC)
4150 sp->default_ss = params->assoc_value;
4152 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4153 params->assoc_id == SCTP_ALL_ASSOC) {
4154 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4155 int ret = sctp_sched_set_sched(asoc,
4156 params->assoc_value);
4166 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4167 struct sctp_stream_value *params,
4168 unsigned int optlen)
4170 struct sctp_association *asoc;
4171 int retval = -EINVAL;
4173 if (optlen < sizeof(*params))
4176 asoc = sctp_id2assoc(sk, params->assoc_id);
4177 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4178 sctp_style(sk, UDP))
4182 retval = sctp_sched_set_value(asoc, params->stream_id,
4183 params->stream_value, GFP_KERNEL);
4189 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4190 int ret = sctp_sched_set_value(asoc, params->stream_id,
4191 params->stream_value,
4193 if (ret && !retval) /* try to return the 1st error. */
4201 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4202 struct sctp_assoc_value *p,
4203 unsigned int optlen)
4205 struct sctp_sock *sp = sctp_sk(sk);
4206 struct sctp_association *asoc;
4208 if (optlen < sizeof(*p))
4211 asoc = sctp_id2assoc(sk, p->assoc_id);
4212 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4215 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4219 sp->ep->intl_enable = !!p->assoc_value;
4223 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4224 unsigned int optlen)
4226 if (!sctp_style(sk, TCP))
4229 if (sctp_sk(sk)->ep->base.bind_addr.port)
4232 if (optlen < sizeof(int))
4235 sctp_sk(sk)->reuse = !!*val;
4240 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4241 struct sctp_association *asoc)
4243 struct sctp_ulpevent *event;
4245 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4247 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4248 if (sctp_outq_is_empty(&asoc->outqueue)) {
4249 event = sctp_ulpevent_make_sender_dry_event(asoc,
4250 GFP_USER | __GFP_NOWARN);
4254 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4261 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4262 unsigned int optlen)
4264 struct sctp_sock *sp = sctp_sk(sk);
4265 struct sctp_association *asoc;
4268 if (optlen < sizeof(*param))
4271 if (param->se_type < SCTP_SN_TYPE_BASE ||
4272 param->se_type > SCTP_SN_TYPE_MAX)
4275 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4276 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4277 sctp_style(sk, UDP))
4281 return sctp_assoc_ulpevent_type_set(param, asoc);
4283 if (sctp_style(sk, TCP))
4284 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4286 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4287 param->se_assoc_id == SCTP_ALL_ASSOC)
4288 sctp_ulpevent_type_set(&sp->subscribe,
4289 param->se_type, param->se_on);
4291 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4292 param->se_assoc_id == SCTP_ALL_ASSOC) {
4293 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4294 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4304 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4305 struct sctp_assoc_value *params,
4306 unsigned int optlen)
4308 struct sctp_association *asoc;
4309 struct sctp_endpoint *ep;
4310 int retval = -EINVAL;
4312 if (optlen != sizeof(*params))
4315 asoc = sctp_id2assoc(sk, params->assoc_id);
4316 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4317 sctp_style(sk, UDP))
4320 ep = sctp_sk(sk)->ep;
4321 ep->asconf_enable = !!params->assoc_value;
4323 if (ep->asconf_enable && ep->auth_enable) {
4324 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4325 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4334 static int sctp_setsockopt_auth_supported(struct sock *sk,
4335 struct sctp_assoc_value *params,
4336 unsigned int optlen)
4338 struct sctp_association *asoc;
4339 struct sctp_endpoint *ep;
4340 int retval = -EINVAL;
4342 if (optlen != sizeof(*params))
4345 asoc = sctp_id2assoc(sk, params->assoc_id);
4346 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4347 sctp_style(sk, UDP))
4350 ep = sctp_sk(sk)->ep;
4351 if (params->assoc_value) {
4352 retval = sctp_auth_init(ep, GFP_KERNEL);
4355 if (ep->asconf_enable) {
4356 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4357 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4361 ep->auth_enable = !!params->assoc_value;
4368 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4369 struct sctp_assoc_value *params,
4370 unsigned int optlen)
4372 struct sctp_association *asoc;
4373 int retval = -EINVAL;
4375 if (optlen != sizeof(*params))
4378 asoc = sctp_id2assoc(sk, params->assoc_id);
4379 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4380 sctp_style(sk, UDP))
4383 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4390 static int sctp_setsockopt_pf_expose(struct sock *sk,
4391 struct sctp_assoc_value *params,
4392 unsigned int optlen)
4394 struct sctp_association *asoc;
4395 int retval = -EINVAL;
4397 if (optlen != sizeof(*params))
4400 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4403 asoc = sctp_id2assoc(sk, params->assoc_id);
4404 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4405 sctp_style(sk, UDP))
4409 asoc->pf_expose = params->assoc_value;
4411 sctp_sk(sk)->pf_expose = params->assoc_value;
4418 static int sctp_setsockopt_encap_port(struct sock *sk,
4419 struct sctp_udpencaps *encap,
4420 unsigned int optlen)
4422 struct sctp_association *asoc;
4423 struct sctp_transport *t;
4426 if (optlen != sizeof(*encap))
4429 /* If an address other than INADDR_ANY is specified, and
4430 * no transport is found, then the request is invalid.
4432 encap_port = (__force __be16)encap->sue_port;
4433 if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4434 t = sctp_addr_id2transport(sk, &encap->sue_address,
4435 encap->sue_assoc_id);
4439 t->encap_port = encap_port;
4443 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4444 * socket is a one to many style socket, and an association
4445 * was not found, then the id was invalid.
4447 asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4448 if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4449 sctp_style(sk, UDP))
4452 /* If changes are for association, also apply encap_port to
4456 list_for_each_entry(t, &asoc->peer.transport_addr_list,
4458 t->encap_port = encap_port;
4463 sctp_sk(sk)->encap_port = encap_port;
4467 /* API 6.2 setsockopt(), getsockopt()
4469 * Applications use setsockopt() and getsockopt() to set or retrieve
4470 * socket options. Socket options are used to change the default
4471 * behavior of sockets calls. They are described in Section 7.
4475 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4476 * int __user *optlen);
4477 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4480 * sd - the socket descript.
4481 * level - set to IPPROTO_SCTP for all SCTP options.
4482 * optname - the option name.
4483 * optval - the buffer to store the value of the option.
4484 * optlen - the size of the buffer.
4486 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4487 sockptr_t optval, unsigned int optlen)
4492 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4494 /* I can hardly begin to describe how wrong this is. This is
4495 * so broken as to be worse than useless. The API draft
4496 * REALLY is NOT helpful here... I am not convinced that the
4497 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4498 * are at all well-founded.
4500 if (level != SOL_SCTP) {
4501 struct sctp_af *af = sctp_sk(sk)->pf->af;
4503 return af->setsockopt(sk, level, optname, optval, optlen);
4507 kopt = memdup_sockptr(optval, optlen);
4509 return PTR_ERR(kopt);
4515 case SCTP_SOCKOPT_BINDX_ADD:
4516 /* 'optlen' is the size of the addresses buffer. */
4517 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4518 SCTP_BINDX_ADD_ADDR);
4521 case SCTP_SOCKOPT_BINDX_REM:
4522 /* 'optlen' is the size of the addresses buffer. */
4523 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4524 SCTP_BINDX_REM_ADDR);
4527 case SCTP_SOCKOPT_CONNECTX_OLD:
4528 /* 'optlen' is the size of the addresses buffer. */
4529 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4532 case SCTP_SOCKOPT_CONNECTX:
4533 /* 'optlen' is the size of the addresses buffer. */
4534 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4537 case SCTP_DISABLE_FRAGMENTS:
4538 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4542 retval = sctp_setsockopt_events(sk, kopt, optlen);
4545 case SCTP_AUTOCLOSE:
4546 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4549 case SCTP_PEER_ADDR_PARAMS:
4550 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4553 case SCTP_DELAYED_SACK:
4554 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4556 case SCTP_PARTIAL_DELIVERY_POINT:
4557 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4561 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4563 case SCTP_DEFAULT_SEND_PARAM:
4564 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4566 case SCTP_DEFAULT_SNDINFO:
4567 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4569 case SCTP_PRIMARY_ADDR:
4570 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4572 case SCTP_SET_PEER_PRIMARY_ADDR:
4573 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4576 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4579 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4581 case SCTP_ASSOCINFO:
4582 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4584 case SCTP_I_WANT_MAPPED_V4_ADDR:
4585 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4588 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4590 case SCTP_ADAPTATION_LAYER:
4591 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4594 retval = sctp_setsockopt_context(sk, kopt, optlen);
4596 case SCTP_FRAGMENT_INTERLEAVE:
4597 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4599 case SCTP_MAX_BURST:
4600 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4602 case SCTP_AUTH_CHUNK:
4603 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4605 case SCTP_HMAC_IDENT:
4606 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4609 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4611 case SCTP_AUTH_ACTIVE_KEY:
4612 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4614 case SCTP_AUTH_DELETE_KEY:
4615 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4617 case SCTP_AUTH_DEACTIVATE_KEY:
4618 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4620 case SCTP_AUTO_ASCONF:
4621 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4623 case SCTP_PEER_ADDR_THLDS:
4624 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4627 case SCTP_PEER_ADDR_THLDS_V2:
4628 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4631 case SCTP_RECVRCVINFO:
4632 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4634 case SCTP_RECVNXTINFO:
4635 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4637 case SCTP_PR_SUPPORTED:
4638 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4640 case SCTP_DEFAULT_PRINFO:
4641 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4643 case SCTP_RECONFIG_SUPPORTED:
4644 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4646 case SCTP_ENABLE_STREAM_RESET:
4647 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4649 case SCTP_RESET_STREAMS:
4650 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4652 case SCTP_RESET_ASSOC:
4653 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4655 case SCTP_ADD_STREAMS:
4656 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4658 case SCTP_STREAM_SCHEDULER:
4659 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4661 case SCTP_STREAM_SCHEDULER_VALUE:
4662 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4664 case SCTP_INTERLEAVING_SUPPORTED:
4665 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4668 case SCTP_REUSE_PORT:
4669 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4672 retval = sctp_setsockopt_event(sk, kopt, optlen);
4674 case SCTP_ASCONF_SUPPORTED:
4675 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4677 case SCTP_AUTH_SUPPORTED:
4678 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4680 case SCTP_ECN_SUPPORTED:
4681 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4683 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4684 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4686 case SCTP_REMOTE_UDP_ENCAPS_PORT:
4687 retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4690 retval = -ENOPROTOOPT;
4699 /* API 3.1.6 connect() - UDP Style Syntax
4701 * An application may use the connect() call in the UDP model to initiate an
4702 * association without sending data.
4706 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4708 * sd: the socket descriptor to have a new association added to.
4710 * nam: the address structure (either struct sockaddr_in or struct
4711 * sockaddr_in6 defined in RFC2553 [7]).
4713 * len: the size of the address.
4715 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4716 int addr_len, int flags)
4722 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4725 /* Validate addr_len before calling common connect/connectx routine. */
4726 af = sctp_get_af_specific(addr->sa_family);
4727 if (af && addr_len >= af->sockaddr_len)
4728 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4734 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4735 int addr_len, int flags)
4737 if (addr_len < sizeof(uaddr->sa_family))
4740 if (uaddr->sa_family == AF_UNSPEC)
4743 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4746 /* FIXME: Write comments. */
4747 static int sctp_disconnect(struct sock *sk, int flags)
4749 return -EOPNOTSUPP; /* STUB */
4752 /* 4.1.4 accept() - TCP Style Syntax
4754 * Applications use accept() call to remove an established SCTP
4755 * association from the accept queue of the endpoint. A new socket
4756 * descriptor will be returned from accept() to represent the newly
4757 * formed association.
4759 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4761 struct sctp_sock *sp;
4762 struct sctp_endpoint *ep;
4763 struct sock *newsk = NULL;
4764 struct sctp_association *asoc;
4773 if (!sctp_style(sk, TCP)) {
4774 error = -EOPNOTSUPP;
4778 if (!sctp_sstate(sk, LISTENING)) {
4783 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4785 error = sctp_wait_for_accept(sk, timeo);
4789 /* We treat the list of associations on the endpoint as the accept
4790 * queue and pick the first association on the list.
4792 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4794 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4800 /* Populate the fields of the newsk from the oldsk and migrate the
4801 * asoc to the newsk.
4803 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4805 sk_common_release(newsk);
4815 /* The SCTP ioctl handler. */
4816 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4823 * SEQPACKET-style sockets in LISTENING state are valid, for
4824 * SCTP, so only discard TCP-style sockets in LISTENING state.
4826 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4831 struct sk_buff *skb;
4832 unsigned int amount = 0;
4834 skb = skb_peek(&sk->sk_receive_queue);
4837 * We will only return the amount of this packet since
4838 * that is all that will be read.
4842 rc = put_user(amount, (int __user *)arg);
4854 /* This is the function which gets called during socket creation to
4855 * initialized the SCTP-specific portion of the sock.
4856 * The sock structure should already be zero-filled memory.
4858 static int sctp_init_sock(struct sock *sk)
4860 struct net *net = sock_net(sk);
4861 struct sctp_sock *sp;
4863 pr_debug("%s: sk:%p\n", __func__, sk);
4867 /* Initialize the SCTP per socket area. */
4868 switch (sk->sk_type) {
4869 case SOCK_SEQPACKET:
4870 sp->type = SCTP_SOCKET_UDP;
4873 sp->type = SCTP_SOCKET_TCP;
4876 return -ESOCKTNOSUPPORT;
4879 sk->sk_gso_type = SKB_GSO_SCTP;
4881 /* Initialize default send parameters. These parameters can be
4882 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4884 sp->default_stream = 0;
4885 sp->default_ppid = 0;
4886 sp->default_flags = 0;
4887 sp->default_context = 0;
4888 sp->default_timetolive = 0;
4890 sp->default_rcv_context = 0;
4891 sp->max_burst = net->sctp.max_burst;
4893 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4895 /* Initialize default setup parameters. These parameters
4896 * can be modified with the SCTP_INITMSG socket option or
4897 * overridden by the SCTP_INIT CMSG.
4899 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4900 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4901 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4902 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4904 /* Initialize default RTO related parameters. These parameters can
4905 * be modified for with the SCTP_RTOINFO socket option.
4907 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4908 sp->rtoinfo.srto_max = net->sctp.rto_max;
4909 sp->rtoinfo.srto_min = net->sctp.rto_min;
4911 /* Initialize default association related parameters. These parameters
4912 * can be modified with the SCTP_ASSOCINFO socket option.
4914 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4915 sp->assocparams.sasoc_number_peer_destinations = 0;
4916 sp->assocparams.sasoc_peer_rwnd = 0;
4917 sp->assocparams.sasoc_local_rwnd = 0;
4918 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4920 /* Initialize default event subscriptions. By default, all the
4925 /* Default Peer Address Parameters. These defaults can
4926 * be modified via SCTP_PEER_ADDR_PARAMS
4928 sp->hbinterval = net->sctp.hb_interval;
4929 sp->udp_port = htons(net->sctp.udp_port);
4930 sp->encap_port = htons(net->sctp.encap_port);
4931 sp->pathmaxrxt = net->sctp.max_retrans_path;
4932 sp->pf_retrans = net->sctp.pf_retrans;
4933 sp->ps_retrans = net->sctp.ps_retrans;
4934 sp->pf_expose = net->sctp.pf_expose;
4935 sp->pathmtu = 0; /* allow default discovery */
4936 sp->sackdelay = net->sctp.sack_timeout;
4938 sp->param_flags = SPP_HB_ENABLE |
4940 SPP_SACKDELAY_ENABLE;
4941 sp->default_ss = SCTP_SS_DEFAULT;
4943 /* If enabled no SCTP message fragmentation will be performed.
4944 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4946 sp->disable_fragments = 0;
4948 /* Enable Nagle algorithm by default. */
4951 sp->recvrcvinfo = 0;
4952 sp->recvnxtinfo = 0;
4954 /* Enable by default. */
4957 /* Auto-close idle associations after the configured
4958 * number of seconds. A value of 0 disables this
4959 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4960 * for UDP-style sockets only.
4964 /* User specified fragmentation limit. */
4967 sp->adaptation_ind = 0;
4969 sp->pf = sctp_get_pf_specific(sk->sk_family);
4971 /* Control variables for partial data delivery. */
4972 atomic_set(&sp->pd_mode, 0);
4973 skb_queue_head_init(&sp->pd_lobby);
4974 sp->frag_interleave = 0;
4976 /* Create a per socket endpoint structure. Even if we
4977 * change the data structure relationships, this may still
4978 * be useful for storing pre-connect address information.
4980 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4986 sk->sk_destruct = sctp_destruct_sock;
4988 SCTP_DBG_OBJCNT_INC(sock);
4991 sk_sockets_allocated_inc(sk);
4992 sock_prot_inuse_add(net, sk->sk_prot, 1);
4994 if (net->sctp.default_auto_asconf) {
4995 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4996 list_add_tail(&sp->auto_asconf_list,
4997 &net->sctp.auto_asconf_splist);
4998 sp->do_auto_asconf = 1;
4999 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5001 sp->do_auto_asconf = 0;
5009 /* Cleanup any SCTP per socket resources. Must be called with
5010 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5012 static void sctp_destroy_sock(struct sock *sk)
5014 struct sctp_sock *sp;
5016 pr_debug("%s: sk:%p\n", __func__, sk);
5018 /* Release our hold on the endpoint. */
5020 /* This could happen during socket init, thus we bail out
5021 * early, since the rest of the below is not setup either.
5026 if (sp->do_auto_asconf) {
5027 sp->do_auto_asconf = 0;
5028 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
5029 list_del(&sp->auto_asconf_list);
5030 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
5032 sctp_endpoint_free(sp->ep);
5034 sk_sockets_allocated_dec(sk);
5035 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5039 /* Triggered when there are no references on the socket anymore */
5040 static void sctp_destruct_sock(struct sock *sk)
5042 struct sctp_sock *sp = sctp_sk(sk);
5044 /* Free up the HMAC transform. */
5045 crypto_free_shash(sp->hmac);
5047 inet_sock_destruct(sk);
5050 /* API 4.1.7 shutdown() - TCP Style Syntax
5051 * int shutdown(int socket, int how);
5053 * sd - the socket descriptor of the association to be closed.
5054 * how - Specifies the type of shutdown. The values are
5057 * Disables further receive operations. No SCTP
5058 * protocol action is taken.
5060 * Disables further send operations, and initiates
5061 * the SCTP shutdown sequence.
5063 * Disables further send and receive operations
5064 * and initiates the SCTP shutdown sequence.
5066 static void sctp_shutdown(struct sock *sk, int how)
5068 struct net *net = sock_net(sk);
5069 struct sctp_endpoint *ep;
5071 if (!sctp_style(sk, TCP))
5074 ep = sctp_sk(sk)->ep;
5075 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5076 struct sctp_association *asoc;
5078 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5079 asoc = list_entry(ep->asocs.next,
5080 struct sctp_association, asocs);
5081 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5085 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5086 struct sctp_info *info)
5088 struct sctp_transport *prim;
5089 struct list_head *pos;
5092 memset(info, 0, sizeof(*info));
5094 struct sctp_sock *sp = sctp_sk(sk);
5096 info->sctpi_s_autoclose = sp->autoclose;
5097 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5098 info->sctpi_s_pd_point = sp->pd_point;
5099 info->sctpi_s_nodelay = sp->nodelay;
5100 info->sctpi_s_disable_fragments = sp->disable_fragments;
5101 info->sctpi_s_v4mapped = sp->v4mapped;
5102 info->sctpi_s_frag_interleave = sp->frag_interleave;
5103 info->sctpi_s_type = sp->type;
5108 info->sctpi_tag = asoc->c.my_vtag;
5109 info->sctpi_state = asoc->state;
5110 info->sctpi_rwnd = asoc->a_rwnd;
5111 info->sctpi_unackdata = asoc->unack_data;
5112 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5113 info->sctpi_instrms = asoc->stream.incnt;
5114 info->sctpi_outstrms = asoc->stream.outcnt;
5115 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5116 info->sctpi_inqueue++;
5117 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5118 info->sctpi_outqueue++;
5119 info->sctpi_overall_error = asoc->overall_error_count;
5120 info->sctpi_max_burst = asoc->max_burst;
5121 info->sctpi_maxseg = asoc->frag_point;
5122 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5123 info->sctpi_peer_tag = asoc->c.peer_vtag;
5125 mask = asoc->peer.ecn_capable << 1;
5126 mask = (mask | asoc->peer.ipv4_address) << 1;
5127 mask = (mask | asoc->peer.ipv6_address) << 1;
5128 mask = (mask | asoc->peer.hostname_address) << 1;
5129 mask = (mask | asoc->peer.asconf_capable) << 1;
5130 mask = (mask | asoc->peer.prsctp_capable) << 1;
5131 mask = (mask | asoc->peer.auth_capable);
5132 info->sctpi_peer_capable = mask;
5133 mask = asoc->peer.sack_needed << 1;
5134 mask = (mask | asoc->peer.sack_generation) << 1;
5135 mask = (mask | asoc->peer.zero_window_announced);
5136 info->sctpi_peer_sack = mask;
5138 info->sctpi_isacks = asoc->stats.isacks;
5139 info->sctpi_osacks = asoc->stats.osacks;
5140 info->sctpi_opackets = asoc->stats.opackets;
5141 info->sctpi_ipackets = asoc->stats.ipackets;
5142 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5143 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5144 info->sctpi_idupchunks = asoc->stats.idupchunks;
5145 info->sctpi_gapcnt = asoc->stats.gapcnt;
5146 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5147 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5148 info->sctpi_oodchunks = asoc->stats.oodchunks;
5149 info->sctpi_iodchunks = asoc->stats.iodchunks;
5150 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5151 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5153 prim = asoc->peer.primary_path;
5154 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5155 info->sctpi_p_state = prim->state;
5156 info->sctpi_p_cwnd = prim->cwnd;
5157 info->sctpi_p_srtt = prim->srtt;
5158 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5159 info->sctpi_p_hbinterval = prim->hbinterval;
5160 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5161 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5162 info->sctpi_p_ssthresh = prim->ssthresh;
5163 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5164 info->sctpi_p_flight_size = prim->flight_size;
5165 info->sctpi_p_error = prim->error_count;
5169 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5171 /* use callback to avoid exporting the core structure */
5172 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5174 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5176 rhashtable_walk_start(iter);
5179 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5181 rhashtable_walk_stop(iter);
5182 rhashtable_walk_exit(iter);
5185 struct sctp_transport *sctp_transport_get_next(struct net *net,
5186 struct rhashtable_iter *iter)
5188 struct sctp_transport *t;
5190 t = rhashtable_walk_next(iter);
5191 for (; t; t = rhashtable_walk_next(iter)) {
5193 if (PTR_ERR(t) == -EAGAIN)
5198 if (!sctp_transport_hold(t))
5201 if (net_eq(t->asoc->base.net, net) &&
5202 t->asoc->peer.primary_path == t)
5205 sctp_transport_put(t);
5211 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5212 struct rhashtable_iter *iter,
5215 struct sctp_transport *t;
5218 return SEQ_START_TOKEN;
5220 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5223 sctp_transport_put(t);
5229 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5233 struct sctp_ep_common *epb;
5234 struct sctp_hashbucket *head;
5236 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5238 read_lock_bh(&head->lock);
5239 sctp_for_each_hentry(epb, &head->chain) {
5240 err = cb(sctp_ep(epb), p);
5244 read_unlock_bh(&head->lock);
5249 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5251 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5253 const union sctp_addr *laddr,
5254 const union sctp_addr *paddr, void *p)
5256 struct sctp_transport *transport;
5260 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5265 err = cb(transport, p);
5266 sctp_transport_put(transport);
5270 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5272 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5273 int (*cb_done)(struct sctp_transport *, void *),
5274 struct net *net, int *pos, void *p) {
5275 struct rhashtable_iter hti;
5276 struct sctp_transport *tsp;
5281 sctp_transport_walk_start(&hti);
5283 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5284 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5289 sctp_transport_put(tsp);
5291 sctp_transport_walk_stop(&hti);
5294 if (cb_done && !cb_done(tsp, p)) {
5296 sctp_transport_put(tsp);
5299 sctp_transport_put(tsp);
5304 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5306 /* 7.2.1 Association Status (SCTP_STATUS)
5308 * Applications can retrieve current status information about an
5309 * association, including association state, peer receiver window size,
5310 * number of unacked data chunks, and number of data chunks pending
5311 * receipt. This information is read-only.
5313 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5314 char __user *optval,
5317 struct sctp_status status;
5318 struct sctp_association *asoc = NULL;
5319 struct sctp_transport *transport;
5320 sctp_assoc_t associd;
5323 if (len < sizeof(status)) {
5328 len = sizeof(status);
5329 if (copy_from_user(&status, optval, len)) {
5334 associd = status.sstat_assoc_id;
5335 asoc = sctp_id2assoc(sk, associd);
5341 transport = asoc->peer.primary_path;
5343 status.sstat_assoc_id = sctp_assoc2id(asoc);
5344 status.sstat_state = sctp_assoc_to_state(asoc);
5345 status.sstat_rwnd = asoc->peer.rwnd;
5346 status.sstat_unackdata = asoc->unack_data;
5348 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5349 status.sstat_instrms = asoc->stream.incnt;
5350 status.sstat_outstrms = asoc->stream.outcnt;
5351 status.sstat_fragmentation_point = asoc->frag_point;
5352 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5353 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5354 transport->af_specific->sockaddr_len);
5355 /* Map ipv4 address into v4-mapped-on-v6 address. */
5356 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5357 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5358 status.sstat_primary.spinfo_state = transport->state;
5359 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5360 status.sstat_primary.spinfo_srtt = transport->srtt;
5361 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5362 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5364 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5365 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5367 if (put_user(len, optlen)) {
5372 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5373 __func__, len, status.sstat_state, status.sstat_rwnd,
5374 status.sstat_assoc_id);
5376 if (copy_to_user(optval, &status, len)) {
5386 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5388 * Applications can retrieve information about a specific peer address
5389 * of an association, including its reachability state, congestion
5390 * window, and retransmission timer values. This information is
5393 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5394 char __user *optval,
5397 struct sctp_paddrinfo pinfo;
5398 struct sctp_transport *transport;
5401 if (len < sizeof(pinfo)) {
5406 len = sizeof(pinfo);
5407 if (copy_from_user(&pinfo, optval, len)) {
5412 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5413 pinfo.spinfo_assoc_id);
5419 if (transport->state == SCTP_PF &&
5420 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5425 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5426 pinfo.spinfo_state = transport->state;
5427 pinfo.spinfo_cwnd = transport->cwnd;
5428 pinfo.spinfo_srtt = transport->srtt;
5429 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5430 pinfo.spinfo_mtu = transport->pathmtu;
5432 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5433 pinfo.spinfo_state = SCTP_ACTIVE;
5435 if (put_user(len, optlen)) {
5440 if (copy_to_user(optval, &pinfo, len)) {
5449 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5451 * This option is a on/off flag. If enabled no SCTP message
5452 * fragmentation will be performed. Instead if a message being sent
5453 * exceeds the current PMTU size, the message will NOT be sent and
5454 * instead a error will be indicated to the user.
5456 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5457 char __user *optval, int __user *optlen)
5461 if (len < sizeof(int))
5465 val = (sctp_sk(sk)->disable_fragments == 1);
5466 if (put_user(len, optlen))
5468 if (copy_to_user(optval, &val, len))
5473 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5475 * This socket option is used to specify various notifications and
5476 * ancillary data the user wishes to receive.
5478 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5481 struct sctp_event_subscribe subscribe;
5482 __u8 *sn_type = (__u8 *)&subscribe;
5487 if (len > sizeof(struct sctp_event_subscribe))
5488 len = sizeof(struct sctp_event_subscribe);
5489 if (put_user(len, optlen))
5492 for (i = 0; i < len; i++)
5493 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5494 SCTP_SN_TYPE_BASE + i);
5496 if (copy_to_user(optval, &subscribe, len))
5502 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5504 * This socket option is applicable to the UDP-style socket only. When
5505 * set it will cause associations that are idle for more than the
5506 * specified number of seconds to automatically close. An association
5507 * being idle is defined an association that has NOT sent or received
5508 * user data. The special value of '0' indicates that no automatic
5509 * close of any associations should be performed. The option expects an
5510 * integer defining the number of seconds of idle time before an
5511 * association is closed.
5513 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5515 /* Applicable to UDP-style socket only */
5516 if (sctp_style(sk, TCP))
5518 if (len < sizeof(int))
5521 if (put_user(len, optlen))
5523 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5528 /* Helper routine to branch off an association to a new socket. */
5529 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5531 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5532 struct sctp_sock *sp = sctp_sk(sk);
5533 struct socket *sock;
5536 /* Do not peel off from one netns to another one. */
5537 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5543 /* An association cannot be branched off from an already peeled-off
5544 * socket, nor is this supported for tcp style sockets.
5546 if (!sctp_style(sk, UDP))
5549 /* Create a new socket. */
5550 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5554 sctp_copy_sock(sock->sk, sk, asoc);
5556 /* Make peeled-off sockets more like 1-1 accepted sockets.
5557 * Set the daddr and initialize id to something more random and also
5558 * copy over any ip options.
5560 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5561 sp->pf->copy_ip_options(sk, sock->sk);
5563 /* Populate the fields of the newsk from the oldsk and migrate the
5564 * asoc to the newsk.
5566 err = sctp_sock_migrate(sk, sock->sk, asoc,
5567 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5577 EXPORT_SYMBOL(sctp_do_peeloff);
5579 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5580 struct file **newfile, unsigned flags)
5582 struct socket *newsock;
5585 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5589 /* Map the socket to an unused fd that can be returned to the user. */
5590 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5592 sock_release(newsock);
5596 *newfile = sock_alloc_file(newsock, 0, NULL);
5597 if (IS_ERR(*newfile)) {
5598 put_unused_fd(retval);
5599 retval = PTR_ERR(*newfile);
5604 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5607 peeloff->sd = retval;
5609 if (flags & SOCK_NONBLOCK)
5610 (*newfile)->f_flags |= O_NONBLOCK;
5615 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5617 sctp_peeloff_arg_t peeloff;
5618 struct file *newfile = NULL;
5621 if (len < sizeof(sctp_peeloff_arg_t))
5623 len = sizeof(sctp_peeloff_arg_t);
5624 if (copy_from_user(&peeloff, optval, len))
5627 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5631 /* Return the fd mapped to the new socket. */
5632 if (put_user(len, optlen)) {
5634 put_unused_fd(retval);
5638 if (copy_to_user(optval, &peeloff, len)) {
5640 put_unused_fd(retval);
5643 fd_install(retval, newfile);
5648 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5649 char __user *optval, int __user *optlen)
5651 sctp_peeloff_flags_arg_t peeloff;
5652 struct file *newfile = NULL;
5655 if (len < sizeof(sctp_peeloff_flags_arg_t))
5657 len = sizeof(sctp_peeloff_flags_arg_t);
5658 if (copy_from_user(&peeloff, optval, len))
5661 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5662 &newfile, peeloff.flags);
5666 /* Return the fd mapped to the new socket. */
5667 if (put_user(len, optlen)) {
5669 put_unused_fd(retval);
5673 if (copy_to_user(optval, &peeloff, len)) {
5675 put_unused_fd(retval);
5678 fd_install(retval, newfile);
5683 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5685 * Applications can enable or disable heartbeats for any peer address of
5686 * an association, modify an address's heartbeat interval, force a
5687 * heartbeat to be sent immediately, and adjust the address's maximum
5688 * number of retransmissions sent before an address is considered
5689 * unreachable. The following structure is used to access and modify an
5690 * address's parameters:
5692 * struct sctp_paddrparams {
5693 * sctp_assoc_t spp_assoc_id;
5694 * struct sockaddr_storage spp_address;
5695 * uint32_t spp_hbinterval;
5696 * uint16_t spp_pathmaxrxt;
5697 * uint32_t spp_pathmtu;
5698 * uint32_t spp_sackdelay;
5699 * uint32_t spp_flags;
5702 * spp_assoc_id - (one-to-many style socket) This is filled in the
5703 * application, and identifies the association for
5705 * spp_address - This specifies which address is of interest.
5706 * spp_hbinterval - This contains the value of the heartbeat interval,
5707 * in milliseconds. If a value of zero
5708 * is present in this field then no changes are to
5709 * be made to this parameter.
5710 * spp_pathmaxrxt - This contains the maximum number of
5711 * retransmissions before this address shall be
5712 * considered unreachable. If a value of zero
5713 * is present in this field then no changes are to
5714 * be made to this parameter.
5715 * spp_pathmtu - When Path MTU discovery is disabled the value
5716 * specified here will be the "fixed" path mtu.
5717 * Note that if the spp_address field is empty
5718 * then all associations on this address will
5719 * have this fixed path mtu set upon them.
5721 * spp_sackdelay - When delayed sack is enabled, this value specifies
5722 * the number of milliseconds that sacks will be delayed
5723 * for. This value will apply to all addresses of an
5724 * association if the spp_address field is empty. Note
5725 * also, that if delayed sack is enabled and this
5726 * value is set to 0, no change is made to the last
5727 * recorded delayed sack timer value.
5729 * spp_flags - These flags are used to control various features
5730 * on an association. The flag field may contain
5731 * zero or more of the following options.
5733 * SPP_HB_ENABLE - Enable heartbeats on the
5734 * specified address. Note that if the address
5735 * field is empty all addresses for the association
5736 * have heartbeats enabled upon them.
5738 * SPP_HB_DISABLE - Disable heartbeats on the
5739 * speicifed address. Note that if the address
5740 * field is empty all addresses for the association
5741 * will have their heartbeats disabled. Note also
5742 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5743 * mutually exclusive, only one of these two should
5744 * be specified. Enabling both fields will have
5745 * undetermined results.
5747 * SPP_HB_DEMAND - Request a user initiated heartbeat
5748 * to be made immediately.
5750 * SPP_PMTUD_ENABLE - This field will enable PMTU
5751 * discovery upon the specified address. Note that
5752 * if the address feild is empty then all addresses
5753 * on the association are effected.
5755 * SPP_PMTUD_DISABLE - This field will disable 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. Not also that
5759 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5760 * exclusive. Enabling both will have undetermined
5763 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5764 * on delayed sack. The time specified in spp_sackdelay
5765 * is used to specify the sack delay for this address. Note
5766 * that if spp_address is empty then all addresses will
5767 * enable delayed sack and take on the sack delay
5768 * value specified in spp_sackdelay.
5769 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5770 * off delayed sack. If the spp_address field is blank then
5771 * delayed sack is disabled for the entire association. Note
5772 * also that this field is mutually exclusive to
5773 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5776 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5777 * setting of the IPV6 flow label value. The value is
5778 * contained in the spp_ipv6_flowlabel field.
5779 * Upon retrieval, this flag will be set to indicate that
5780 * the spp_ipv6_flowlabel field has a valid value returned.
5781 * If a specific destination address is set (in the
5782 * spp_address field), then the value returned is that of
5783 * the address. If just an association is specified (and
5784 * no address), then the association's default flow label
5785 * is returned. If neither an association nor a destination
5786 * is specified, then the socket's default flow label is
5787 * returned. For non-IPv6 sockets, this flag will be left
5790 * SPP_DSCP: Setting this flag enables the setting of the
5791 * Differentiated Services Code Point (DSCP) value
5792 * associated with either the association or a specific
5793 * address. The value is obtained in the spp_dscp field.
5794 * Upon retrieval, this flag will be set to indicate that
5795 * the spp_dscp field has a valid value returned. If a
5796 * specific destination address is set when called (in the
5797 * spp_address field), then that specific destination
5798 * address's DSCP value is returned. If just an association
5799 * is specified, then the association's default DSCP is
5800 * returned. If neither an association nor a destination is
5801 * specified, then the socket's default DSCP is returned.
5803 * spp_ipv6_flowlabel
5804 * - This field is used in conjunction with the
5805 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5806 * The 20 least significant bits are used for the flow
5807 * label. This setting has precedence over any IPv6-layer
5810 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5811 * and contains the DSCP. The 6 most significant bits are
5812 * used for the DSCP. This setting has precedence over any
5813 * IPv4- or IPv6- layer setting.
5815 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5816 char __user *optval, int __user *optlen)
5818 struct sctp_paddrparams params;
5819 struct sctp_transport *trans = NULL;
5820 struct sctp_association *asoc = NULL;
5821 struct sctp_sock *sp = sctp_sk(sk);
5823 if (len >= sizeof(params))
5824 len = sizeof(params);
5825 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5826 spp_ipv6_flowlabel), 4))
5827 len = ALIGN(offsetof(struct sctp_paddrparams,
5828 spp_ipv6_flowlabel), 4);
5832 if (copy_from_user(¶ms, optval, len))
5835 /* If an address other than INADDR_ANY is specified, and
5836 * no transport is found, then the request is invalid.
5838 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5839 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5840 params.spp_assoc_id);
5842 pr_debug("%s: failed no transport\n", __func__);
5847 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5848 * socket is a one to many style socket, and an association
5849 * was not found, then the id was invalid.
5851 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5852 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5853 sctp_style(sk, UDP)) {
5854 pr_debug("%s: failed no association\n", __func__);
5859 /* Fetch transport values. */
5860 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5861 params.spp_pathmtu = trans->pathmtu;
5862 params.spp_pathmaxrxt = trans->pathmaxrxt;
5863 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5865 /*draft-11 doesn't say what to return in spp_flags*/
5866 params.spp_flags = trans->param_flags;
5867 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5868 params.spp_ipv6_flowlabel = trans->flowlabel &
5869 SCTP_FLOWLABEL_VAL_MASK;
5870 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5872 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5873 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5874 params.spp_flags |= SPP_DSCP;
5877 /* Fetch association values. */
5878 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5879 params.spp_pathmtu = asoc->pathmtu;
5880 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5881 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5883 /*draft-11 doesn't say what to return in spp_flags*/
5884 params.spp_flags = asoc->param_flags;
5885 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5886 params.spp_ipv6_flowlabel = asoc->flowlabel &
5887 SCTP_FLOWLABEL_VAL_MASK;
5888 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5890 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5891 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5892 params.spp_flags |= SPP_DSCP;
5895 /* Fetch socket values. */
5896 params.spp_hbinterval = sp->hbinterval;
5897 params.spp_pathmtu = sp->pathmtu;
5898 params.spp_sackdelay = sp->sackdelay;
5899 params.spp_pathmaxrxt = sp->pathmaxrxt;
5901 /*draft-11 doesn't say what to return in spp_flags*/
5902 params.spp_flags = sp->param_flags;
5903 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5904 params.spp_ipv6_flowlabel = sp->flowlabel &
5905 SCTP_FLOWLABEL_VAL_MASK;
5906 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5908 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5909 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5910 params.spp_flags |= SPP_DSCP;
5914 if (copy_to_user(optval, ¶ms, len))
5917 if (put_user(len, optlen))
5924 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5926 * This option will effect the way delayed acks are performed. This
5927 * option allows you to get or set the delayed ack time, in
5928 * milliseconds. It also allows changing the delayed ack frequency.
5929 * Changing the frequency to 1 disables the delayed sack algorithm. If
5930 * the assoc_id is 0, then this sets or gets the endpoints default
5931 * values. If the assoc_id field is non-zero, then the set or get
5932 * effects the specified association for the one to many model (the
5933 * assoc_id field is ignored by the one to one model). Note that if
5934 * sack_delay or sack_freq are 0 when setting this option, then the
5935 * current values will remain unchanged.
5937 * struct sctp_sack_info {
5938 * sctp_assoc_t sack_assoc_id;
5939 * uint32_t sack_delay;
5940 * uint32_t sack_freq;
5943 * sack_assoc_id - This parameter, indicates which association the user
5944 * is performing an action upon. Note that if this field's value is
5945 * zero then the endpoints default value is changed (effecting future
5946 * associations only).
5948 * sack_delay - This parameter contains the number of milliseconds that
5949 * the user is requesting the delayed ACK timer be set to. Note that
5950 * this value is defined in the standard to be between 200 and 500
5953 * sack_freq - This parameter contains the number of packets that must
5954 * be received before a sack is sent without waiting for the delay
5955 * timer to expire. The default value for this is 2, setting this
5956 * value to 1 will disable the delayed sack algorithm.
5958 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5959 char __user *optval,
5962 struct sctp_sack_info params;
5963 struct sctp_association *asoc = NULL;
5964 struct sctp_sock *sp = sctp_sk(sk);
5966 if (len >= sizeof(struct sctp_sack_info)) {
5967 len = sizeof(struct sctp_sack_info);
5969 if (copy_from_user(¶ms, optval, len))
5971 } else if (len == sizeof(struct sctp_assoc_value)) {
5972 pr_warn_ratelimited(DEPRECATED
5974 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5975 "Use struct sctp_sack_info instead\n",
5976 current->comm, task_pid_nr(current));
5977 if (copy_from_user(¶ms, optval, len))
5982 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5983 * socket is a one to many style socket, and an association
5984 * was not found, then the id was invalid.
5986 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5987 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
5988 sctp_style(sk, UDP))
5992 /* Fetch association values. */
5993 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5994 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
5995 params.sack_freq = asoc->sackfreq;
5998 params.sack_delay = 0;
5999 params.sack_freq = 1;
6002 /* Fetch socket values. */
6003 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6004 params.sack_delay = sp->sackdelay;
6005 params.sack_freq = sp->sackfreq;
6007 params.sack_delay = 0;
6008 params.sack_freq = 1;
6012 if (copy_to_user(optval, ¶ms, len))
6015 if (put_user(len, optlen))
6021 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6023 * Applications can specify protocol parameters for the default association
6024 * initialization. The option name argument to setsockopt() and getsockopt()
6027 * Setting initialization parameters is effective only on an unconnected
6028 * socket (for UDP-style sockets only future associations are effected
6029 * by the change). With TCP-style sockets, this option is inherited by
6030 * sockets derived from a listener socket.
6032 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6034 if (len < sizeof(struct sctp_initmsg))
6036 len = sizeof(struct sctp_initmsg);
6037 if (put_user(len, optlen))
6039 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6045 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6046 char __user *optval, int __user *optlen)
6048 struct sctp_association *asoc;
6050 struct sctp_getaddrs getaddrs;
6051 struct sctp_transport *from;
6053 union sctp_addr temp;
6054 struct sctp_sock *sp = sctp_sk(sk);
6059 if (len < sizeof(struct sctp_getaddrs))
6062 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6065 /* For UDP-style sockets, id specifies the association to query. */
6066 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6070 to = optval + offsetof(struct sctp_getaddrs, addrs);
6071 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6073 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6075 memcpy(&temp, &from->ipaddr, sizeof(temp));
6076 addrlen = sctp_get_pf_specific(sk->sk_family)
6077 ->addr_to_user(sp, &temp);
6078 if (space_left < addrlen)
6080 if (copy_to_user(to, &temp, addrlen))
6084 space_left -= addrlen;
6087 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6089 bytes_copied = ((char __user *)to) - optval;
6090 if (put_user(bytes_copied, optlen))
6096 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6097 size_t space_left, int *bytes_copied)
6099 struct sctp_sockaddr_entry *addr;
6100 union sctp_addr temp;
6103 struct net *net = sock_net(sk);
6106 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6110 if ((PF_INET == sk->sk_family) &&
6111 (AF_INET6 == addr->a.sa.sa_family))
6113 if ((PF_INET6 == sk->sk_family) &&
6114 inet_v6_ipv6only(sk) &&
6115 (AF_INET == addr->a.sa.sa_family))
6117 memcpy(&temp, &addr->a, sizeof(temp));
6118 if (!temp.v4.sin_port)
6119 temp.v4.sin_port = htons(port);
6121 addrlen = sctp_get_pf_specific(sk->sk_family)
6122 ->addr_to_user(sctp_sk(sk), &temp);
6124 if (space_left < addrlen) {
6128 memcpy(to, &temp, addrlen);
6132 space_left -= addrlen;
6133 *bytes_copied += addrlen;
6141 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6142 char __user *optval, int __user *optlen)
6144 struct sctp_bind_addr *bp;
6145 struct sctp_association *asoc;
6147 struct sctp_getaddrs getaddrs;
6148 struct sctp_sockaddr_entry *addr;
6150 union sctp_addr temp;
6151 struct sctp_sock *sp = sctp_sk(sk);
6155 int bytes_copied = 0;
6159 if (len < sizeof(struct sctp_getaddrs))
6162 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6166 * For UDP-style sockets, id specifies the association to query.
6167 * If the id field is set to the value '0' then the locally bound
6168 * addresses are returned without regard to any particular
6171 if (0 == getaddrs.assoc_id) {
6172 bp = &sctp_sk(sk)->ep->base.bind_addr;
6174 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6177 bp = &asoc->base.bind_addr;
6180 to = optval + offsetof(struct sctp_getaddrs, addrs);
6181 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6183 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6187 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6188 * addresses from the global local address list.
6190 if (sctp_list_single_entry(&bp->address_list)) {
6191 addr = list_entry(bp->address_list.next,
6192 struct sctp_sockaddr_entry, list);
6193 if (sctp_is_any(sk, &addr->a)) {
6194 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6195 space_left, &bytes_copied);
6205 /* Protection on the bound address list is not needed since
6206 * in the socket option context we hold a socket lock and
6207 * thus the bound address list can't change.
6209 list_for_each_entry(addr, &bp->address_list, list) {
6210 memcpy(&temp, &addr->a, sizeof(temp));
6211 addrlen = sctp_get_pf_specific(sk->sk_family)
6212 ->addr_to_user(sp, &temp);
6213 if (space_left < addrlen) {
6214 err = -ENOMEM; /*fixme: right error?*/
6217 memcpy(buf, &temp, addrlen);
6219 bytes_copied += addrlen;
6221 space_left -= addrlen;
6225 if (copy_to_user(to, addrs, bytes_copied)) {
6229 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6233 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6234 * but we can't change it anymore.
6236 if (put_user(bytes_copied, optlen))
6243 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6245 * Requests that the local SCTP stack use the enclosed peer address as
6246 * the association primary. The enclosed address must be one of the
6247 * association peer's addresses.
6249 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6250 char __user *optval, int __user *optlen)
6252 struct sctp_prim prim;
6253 struct sctp_association *asoc;
6254 struct sctp_sock *sp = sctp_sk(sk);
6256 if (len < sizeof(struct sctp_prim))
6259 len = sizeof(struct sctp_prim);
6261 if (copy_from_user(&prim, optval, len))
6264 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6268 if (!asoc->peer.primary_path)
6271 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6272 asoc->peer.primary_path->af_specific->sockaddr_len);
6274 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6275 (union sctp_addr *)&prim.ssp_addr);
6277 if (put_user(len, optlen))
6279 if (copy_to_user(optval, &prim, len))
6286 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6288 * Requests that the local endpoint set the specified Adaptation Layer
6289 * Indication parameter for all future INIT and INIT-ACK exchanges.
6291 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6292 char __user *optval, int __user *optlen)
6294 struct sctp_setadaptation adaptation;
6296 if (len < sizeof(struct sctp_setadaptation))
6299 len = sizeof(struct sctp_setadaptation);
6301 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6303 if (put_user(len, optlen))
6305 if (copy_to_user(optval, &adaptation, len))
6313 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6315 * Applications that wish to use the sendto() system call may wish to
6316 * specify a default set of parameters that would normally be supplied
6317 * through the inclusion of ancillary data. This socket option allows
6318 * such an application to set the default sctp_sndrcvinfo structure.
6321 * The application that wishes to use this socket option simply passes
6322 * in to this call the sctp_sndrcvinfo structure defined in Section
6323 * 5.2.2) The input parameters accepted by this call include
6324 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6325 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6326 * to this call if the caller is using the UDP model.
6328 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6330 static int sctp_getsockopt_default_send_param(struct sock *sk,
6331 int len, char __user *optval,
6334 struct sctp_sock *sp = sctp_sk(sk);
6335 struct sctp_association *asoc;
6336 struct sctp_sndrcvinfo info;
6338 if (len < sizeof(info))
6343 if (copy_from_user(&info, optval, len))
6346 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6347 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6348 sctp_style(sk, UDP))
6352 info.sinfo_stream = asoc->default_stream;
6353 info.sinfo_flags = asoc->default_flags;
6354 info.sinfo_ppid = asoc->default_ppid;
6355 info.sinfo_context = asoc->default_context;
6356 info.sinfo_timetolive = asoc->default_timetolive;
6358 info.sinfo_stream = sp->default_stream;
6359 info.sinfo_flags = sp->default_flags;
6360 info.sinfo_ppid = sp->default_ppid;
6361 info.sinfo_context = sp->default_context;
6362 info.sinfo_timetolive = sp->default_timetolive;
6365 if (put_user(len, optlen))
6367 if (copy_to_user(optval, &info, len))
6373 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6374 * (SCTP_DEFAULT_SNDINFO)
6376 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6377 char __user *optval,
6380 struct sctp_sock *sp = sctp_sk(sk);
6381 struct sctp_association *asoc;
6382 struct sctp_sndinfo info;
6384 if (len < sizeof(info))
6389 if (copy_from_user(&info, optval, len))
6392 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6393 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6394 sctp_style(sk, UDP))
6398 info.snd_sid = asoc->default_stream;
6399 info.snd_flags = asoc->default_flags;
6400 info.snd_ppid = asoc->default_ppid;
6401 info.snd_context = asoc->default_context;
6403 info.snd_sid = sp->default_stream;
6404 info.snd_flags = sp->default_flags;
6405 info.snd_ppid = sp->default_ppid;
6406 info.snd_context = sp->default_context;
6409 if (put_user(len, optlen))
6411 if (copy_to_user(optval, &info, len))
6419 * 7.1.5 SCTP_NODELAY
6421 * Turn on/off any Nagle-like algorithm. This means that packets are
6422 * generally sent as soon as possible and no unnecessary delays are
6423 * introduced, at the cost of more packets in the network. Expects an
6424 * integer boolean flag.
6427 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6428 char __user *optval, int __user *optlen)
6432 if (len < sizeof(int))
6436 val = (sctp_sk(sk)->nodelay == 1);
6437 if (put_user(len, optlen))
6439 if (copy_to_user(optval, &val, len))
6446 * 7.1.1 SCTP_RTOINFO
6448 * The protocol parameters used to initialize and bound retransmission
6449 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6450 * and modify these parameters.
6451 * All parameters are time values, in milliseconds. A value of 0, when
6452 * modifying the parameters, indicates that the current value should not
6456 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6457 char __user *optval,
6458 int __user *optlen) {
6459 struct sctp_rtoinfo rtoinfo;
6460 struct sctp_association *asoc;
6462 if (len < sizeof (struct sctp_rtoinfo))
6465 len = sizeof(struct sctp_rtoinfo);
6467 if (copy_from_user(&rtoinfo, optval, len))
6470 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6472 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6473 sctp_style(sk, UDP))
6476 /* Values corresponding to the specific association. */
6478 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6479 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6480 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6482 /* Values corresponding to the endpoint. */
6483 struct sctp_sock *sp = sctp_sk(sk);
6485 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6486 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6487 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6490 if (put_user(len, optlen))
6493 if (copy_to_user(optval, &rtoinfo, len))
6501 * 7.1.2 SCTP_ASSOCINFO
6503 * This option is used to tune the maximum retransmission attempts
6504 * of the association.
6505 * Returns an error if the new association retransmission value is
6506 * greater than the sum of the retransmission value of the peer.
6507 * See [SCTP] for more information.
6510 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6511 char __user *optval,
6515 struct sctp_assocparams assocparams;
6516 struct sctp_association *asoc;
6517 struct list_head *pos;
6520 if (len < sizeof (struct sctp_assocparams))
6523 len = sizeof(struct sctp_assocparams);
6525 if (copy_from_user(&assocparams, optval, len))
6528 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6530 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6531 sctp_style(sk, UDP))
6534 /* Values correspoinding to the specific association */
6536 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6537 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6538 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6539 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6541 list_for_each(pos, &asoc->peer.transport_addr_list) {
6545 assocparams.sasoc_number_peer_destinations = cnt;
6547 /* Values corresponding to the endpoint */
6548 struct sctp_sock *sp = sctp_sk(sk);
6550 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6551 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6552 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6553 assocparams.sasoc_cookie_life =
6554 sp->assocparams.sasoc_cookie_life;
6555 assocparams.sasoc_number_peer_destinations =
6557 sasoc_number_peer_destinations;
6560 if (put_user(len, optlen))
6563 if (copy_to_user(optval, &assocparams, len))
6570 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6572 * This socket option is a boolean flag which turns on or off mapped V4
6573 * addresses. If this option is turned on and the socket is type
6574 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6575 * If this option is turned off, then no mapping will be done of V4
6576 * addresses and a user will receive both PF_INET6 and PF_INET type
6577 * addresses on the socket.
6579 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6580 char __user *optval, int __user *optlen)
6583 struct sctp_sock *sp = sctp_sk(sk);
6585 if (len < sizeof(int))
6590 if (put_user(len, optlen))
6592 if (copy_to_user(optval, &val, len))
6599 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6600 * (chapter and verse is quoted at sctp_setsockopt_context())
6602 static int sctp_getsockopt_context(struct sock *sk, int len,
6603 char __user *optval, int __user *optlen)
6605 struct sctp_assoc_value params;
6606 struct sctp_association *asoc;
6608 if (len < sizeof(struct sctp_assoc_value))
6611 len = sizeof(struct sctp_assoc_value);
6613 if (copy_from_user(¶ms, optval, len))
6616 asoc = sctp_id2assoc(sk, params.assoc_id);
6617 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6618 sctp_style(sk, UDP))
6621 params.assoc_value = asoc ? asoc->default_rcv_context
6622 : sctp_sk(sk)->default_rcv_context;
6624 if (put_user(len, optlen))
6626 if (copy_to_user(optval, ¶ms, len))
6633 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6634 * This option will get or set the maximum size to put in any outgoing
6635 * SCTP DATA chunk. If a message is larger than this size it will be
6636 * fragmented by SCTP into the specified size. Note that the underlying
6637 * SCTP implementation may fragment into smaller sized chunks when the
6638 * PMTU of the underlying association is smaller than the value set by
6639 * the user. The default value for this option is '0' which indicates
6640 * the user is NOT limiting fragmentation and only the PMTU will effect
6641 * SCTP's choice of DATA chunk size. Note also that values set larger
6642 * than the maximum size of an IP datagram will effectively let SCTP
6643 * control fragmentation (i.e. the same as setting this option to 0).
6645 * The following structure is used to access and modify this parameter:
6647 * struct sctp_assoc_value {
6648 * sctp_assoc_t assoc_id;
6649 * uint32_t assoc_value;
6652 * assoc_id: This parameter is ignored for one-to-one style sockets.
6653 * For one-to-many style sockets this parameter indicates which
6654 * association the user is performing an action upon. Note that if
6655 * this field's value is zero then the endpoints default value is
6656 * changed (effecting future associations only).
6657 * assoc_value: This parameter specifies the maximum size in bytes.
6659 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6660 char __user *optval, int __user *optlen)
6662 struct sctp_assoc_value params;
6663 struct sctp_association *asoc;
6665 if (len == sizeof(int)) {
6666 pr_warn_ratelimited(DEPRECATED
6668 "Use of int in maxseg socket option.\n"
6669 "Use struct sctp_assoc_value instead\n",
6670 current->comm, task_pid_nr(current));
6671 params.assoc_id = SCTP_FUTURE_ASSOC;
6672 } else if (len >= sizeof(struct sctp_assoc_value)) {
6673 len = sizeof(struct sctp_assoc_value);
6674 if (copy_from_user(¶ms, optval, len))
6679 asoc = sctp_id2assoc(sk, params.assoc_id);
6680 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6681 sctp_style(sk, UDP))
6685 params.assoc_value = asoc->frag_point;
6687 params.assoc_value = sctp_sk(sk)->user_frag;
6689 if (put_user(len, optlen))
6691 if (len == sizeof(int)) {
6692 if (copy_to_user(optval, ¶ms.assoc_value, len))
6695 if (copy_to_user(optval, ¶ms, len))
6703 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6704 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6706 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6707 char __user *optval, int __user *optlen)
6711 if (len < sizeof(int))
6716 val = sctp_sk(sk)->frag_interleave;
6717 if (put_user(len, optlen))
6719 if (copy_to_user(optval, &val, len))
6726 * 7.1.25. Set or Get the sctp partial delivery point
6727 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6729 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6730 char __user *optval,
6735 if (len < sizeof(u32))
6740 val = sctp_sk(sk)->pd_point;
6741 if (put_user(len, optlen))
6743 if (copy_to_user(optval, &val, len))
6750 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6751 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6753 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6754 char __user *optval,
6757 struct sctp_assoc_value params;
6758 struct sctp_association *asoc;
6760 if (len == sizeof(int)) {
6761 pr_warn_ratelimited(DEPRECATED
6763 "Use of int in max_burst socket option.\n"
6764 "Use struct sctp_assoc_value instead\n",
6765 current->comm, task_pid_nr(current));
6766 params.assoc_id = SCTP_FUTURE_ASSOC;
6767 } else if (len >= sizeof(struct sctp_assoc_value)) {
6768 len = sizeof(struct sctp_assoc_value);
6769 if (copy_from_user(¶ms, optval, len))
6774 asoc = sctp_id2assoc(sk, params.assoc_id);
6775 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6776 sctp_style(sk, UDP))
6779 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6781 if (len == sizeof(int)) {
6782 if (copy_to_user(optval, ¶ms.assoc_value, len))
6785 if (copy_to_user(optval, ¶ms, len))
6793 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6794 char __user *optval, int __user *optlen)
6796 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6797 struct sctp_hmacalgo __user *p = (void __user *)optval;
6798 struct sctp_hmac_algo_param *hmacs;
6803 if (!ep->auth_enable)
6806 hmacs = ep->auth_hmacs_list;
6807 data_len = ntohs(hmacs->param_hdr.length) -
6808 sizeof(struct sctp_paramhdr);
6810 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6813 len = sizeof(struct sctp_hmacalgo) + data_len;
6814 num_idents = data_len / sizeof(u16);
6816 if (put_user(len, optlen))
6818 if (put_user(num_idents, &p->shmac_num_idents))
6820 for (i = 0; i < num_idents; i++) {
6821 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6823 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6829 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6830 char __user *optval, int __user *optlen)
6832 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6833 struct sctp_authkeyid val;
6834 struct sctp_association *asoc;
6836 if (len < sizeof(struct sctp_authkeyid))
6839 len = sizeof(struct sctp_authkeyid);
6840 if (copy_from_user(&val, optval, len))
6843 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6844 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6848 if (!asoc->peer.auth_capable)
6850 val.scact_keynumber = asoc->active_key_id;
6852 if (!ep->auth_enable)
6854 val.scact_keynumber = ep->active_key_id;
6857 if (put_user(len, optlen))
6859 if (copy_to_user(optval, &val, len))
6865 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6866 char __user *optval, int __user *optlen)
6868 struct sctp_authchunks __user *p = (void __user *)optval;
6869 struct sctp_authchunks val;
6870 struct sctp_association *asoc;
6871 struct sctp_chunks_param *ch;
6875 if (len < sizeof(struct sctp_authchunks))
6878 if (copy_from_user(&val, optval, sizeof(val)))
6881 to = p->gauth_chunks;
6882 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6886 if (!asoc->peer.auth_capable)
6889 ch = asoc->peer.peer_chunks;
6893 /* See if the user provided enough room for all the data */
6894 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6895 if (len < num_chunks)
6898 if (copy_to_user(to, ch->chunks, num_chunks))
6901 len = sizeof(struct sctp_authchunks) + num_chunks;
6902 if (put_user(len, optlen))
6904 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6909 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6910 char __user *optval, int __user *optlen)
6912 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6913 struct sctp_authchunks __user *p = (void __user *)optval;
6914 struct sctp_authchunks val;
6915 struct sctp_association *asoc;
6916 struct sctp_chunks_param *ch;
6920 if (len < sizeof(struct sctp_authchunks))
6923 if (copy_from_user(&val, optval, sizeof(val)))
6926 to = p->gauth_chunks;
6927 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6928 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6929 sctp_style(sk, UDP))
6933 if (!asoc->peer.auth_capable)
6935 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6937 if (!ep->auth_enable)
6939 ch = ep->auth_chunk_list;
6944 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6945 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6948 if (copy_to_user(to, ch->chunks, num_chunks))
6951 len = sizeof(struct sctp_authchunks) + num_chunks;
6952 if (put_user(len, optlen))
6954 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6961 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6962 * This option gets the current number of associations that are attached
6963 * to a one-to-many style socket. The option value is an uint32_t.
6965 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6966 char __user *optval, int __user *optlen)
6968 struct sctp_sock *sp = sctp_sk(sk);
6969 struct sctp_association *asoc;
6972 if (sctp_style(sk, TCP))
6975 if (len < sizeof(u32))
6980 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6984 if (put_user(len, optlen))
6986 if (copy_to_user(optval, &val, len))
6993 * 8.1.23 SCTP_AUTO_ASCONF
6994 * See the corresponding setsockopt entry as description
6996 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6997 char __user *optval, int __user *optlen)
7001 if (len < sizeof(int))
7005 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7007 if (put_user(len, optlen))
7009 if (copy_to_user(optval, &val, len))
7015 * 8.2.6. Get the Current Identifiers of Associations
7016 * (SCTP_GET_ASSOC_ID_LIST)
7018 * This option gets the current list of SCTP association identifiers of
7019 * the SCTP associations handled by a one-to-many style socket.
7021 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7022 char __user *optval, int __user *optlen)
7024 struct sctp_sock *sp = sctp_sk(sk);
7025 struct sctp_association *asoc;
7026 struct sctp_assoc_ids *ids;
7029 if (sctp_style(sk, TCP))
7032 if (len < sizeof(struct sctp_assoc_ids))
7035 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7039 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7042 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7044 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7048 ids->gaids_number_of_ids = num;
7050 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7051 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7054 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7064 * SCTP_PEER_ADDR_THLDS
7066 * This option allows us to fetch the partially failed threshold for one or all
7067 * transports in an association. See Section 6.1 of:
7068 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7070 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7071 char __user *optval, int len,
7072 int __user *optlen, bool v2)
7074 struct sctp_paddrthlds_v2 val;
7075 struct sctp_transport *trans;
7076 struct sctp_association *asoc;
7079 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7083 if (copy_from_user(&val, optval, len))
7086 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7087 trans = sctp_addr_id2transport(sk, &val.spt_address,
7092 val.spt_pathmaxrxt = trans->pathmaxrxt;
7093 val.spt_pathpfthld = trans->pf_retrans;
7094 val.spt_pathcpthld = trans->ps_retrans;
7099 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7100 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7101 sctp_style(sk, UDP))
7105 val.spt_pathpfthld = asoc->pf_retrans;
7106 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7107 val.spt_pathcpthld = asoc->ps_retrans;
7109 struct sctp_sock *sp = sctp_sk(sk);
7111 val.spt_pathpfthld = sp->pf_retrans;
7112 val.spt_pathmaxrxt = sp->pathmaxrxt;
7113 val.spt_pathcpthld = sp->ps_retrans;
7117 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7124 * SCTP_GET_ASSOC_STATS
7126 * This option retrieves local per endpoint statistics. It is modeled
7127 * after OpenSolaris' implementation
7129 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7130 char __user *optval,
7133 struct sctp_assoc_stats sas;
7134 struct sctp_association *asoc = NULL;
7136 /* User must provide at least the assoc id */
7137 if (len < sizeof(sctp_assoc_t))
7140 /* Allow the struct to grow and fill in as much as possible */
7141 len = min_t(size_t, len, sizeof(sas));
7143 if (copy_from_user(&sas, optval, len))
7146 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7150 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7151 sas.sas_gapcnt = asoc->stats.gapcnt;
7152 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7153 sas.sas_osacks = asoc->stats.osacks;
7154 sas.sas_isacks = asoc->stats.isacks;
7155 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7156 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7157 sas.sas_oodchunks = asoc->stats.oodchunks;
7158 sas.sas_iodchunks = asoc->stats.iodchunks;
7159 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7160 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7161 sas.sas_idupchunks = asoc->stats.idupchunks;
7162 sas.sas_opackets = asoc->stats.opackets;
7163 sas.sas_ipackets = asoc->stats.ipackets;
7165 /* New high max rto observed, will return 0 if not a single
7166 * RTO update took place. obs_rto_ipaddr will be bogus
7169 sas.sas_maxrto = asoc->stats.max_obs_rto;
7170 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7171 sizeof(struct sockaddr_storage));
7173 /* Mark beginning of a new observation period */
7174 asoc->stats.max_obs_rto = asoc->rto_min;
7176 if (put_user(len, optlen))
7179 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7181 if (copy_to_user(optval, &sas, len))
7187 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7188 char __user *optval,
7193 if (len < sizeof(int))
7197 if (sctp_sk(sk)->recvrcvinfo)
7199 if (put_user(len, optlen))
7201 if (copy_to_user(optval, &val, len))
7207 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7208 char __user *optval,
7213 if (len < sizeof(int))
7217 if (sctp_sk(sk)->recvnxtinfo)
7219 if (put_user(len, optlen))
7221 if (copy_to_user(optval, &val, len))
7227 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7228 char __user *optval,
7231 struct sctp_assoc_value params;
7232 struct sctp_association *asoc;
7233 int retval = -EFAULT;
7235 if (len < sizeof(params)) {
7240 len = sizeof(params);
7241 if (copy_from_user(¶ms, optval, len))
7244 asoc = sctp_id2assoc(sk, params.assoc_id);
7245 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7246 sctp_style(sk, UDP)) {
7251 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7252 : sctp_sk(sk)->ep->prsctp_enable;
7254 if (put_user(len, optlen))
7257 if (copy_to_user(optval, ¶ms, len))
7266 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7267 char __user *optval,
7270 struct sctp_default_prinfo info;
7271 struct sctp_association *asoc;
7272 int retval = -EFAULT;
7274 if (len < sizeof(info)) {
7280 if (copy_from_user(&info, optval, len))
7283 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7284 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7285 sctp_style(sk, UDP)) {
7291 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7292 info.pr_value = asoc->default_timetolive;
7294 struct sctp_sock *sp = sctp_sk(sk);
7296 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7297 info.pr_value = sp->default_timetolive;
7300 if (put_user(len, optlen))
7303 if (copy_to_user(optval, &info, len))
7312 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7313 char __user *optval,
7316 struct sctp_prstatus params;
7317 struct sctp_association *asoc;
7319 int retval = -EINVAL;
7321 if (len < sizeof(params))
7324 len = sizeof(params);
7325 if (copy_from_user(¶ms, optval, len)) {
7330 policy = params.sprstat_policy;
7331 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7332 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7335 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7339 if (policy == SCTP_PR_SCTP_ALL) {
7340 params.sprstat_abandoned_unsent = 0;
7341 params.sprstat_abandoned_sent = 0;
7342 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7343 params.sprstat_abandoned_unsent +=
7344 asoc->abandoned_unsent[policy];
7345 params.sprstat_abandoned_sent +=
7346 asoc->abandoned_sent[policy];
7349 params.sprstat_abandoned_unsent =
7350 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7351 params.sprstat_abandoned_sent =
7352 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7355 if (put_user(len, optlen)) {
7360 if (copy_to_user(optval, ¶ms, len)) {
7371 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7372 char __user *optval,
7375 struct sctp_stream_out_ext *streamoute;
7376 struct sctp_association *asoc;
7377 struct sctp_prstatus params;
7378 int retval = -EINVAL;
7381 if (len < sizeof(params))
7384 len = sizeof(params);
7385 if (copy_from_user(¶ms, optval, len)) {
7390 policy = params.sprstat_policy;
7391 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7392 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7395 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7396 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7399 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7401 /* Not allocated yet, means all stats are 0 */
7402 params.sprstat_abandoned_unsent = 0;
7403 params.sprstat_abandoned_sent = 0;
7408 if (policy == SCTP_PR_SCTP_ALL) {
7409 params.sprstat_abandoned_unsent = 0;
7410 params.sprstat_abandoned_sent = 0;
7411 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7412 params.sprstat_abandoned_unsent +=
7413 streamoute->abandoned_unsent[policy];
7414 params.sprstat_abandoned_sent +=
7415 streamoute->abandoned_sent[policy];
7418 params.sprstat_abandoned_unsent =
7419 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7420 params.sprstat_abandoned_sent =
7421 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7424 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7435 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7436 char __user *optval,
7439 struct sctp_assoc_value params;
7440 struct sctp_association *asoc;
7441 int retval = -EFAULT;
7443 if (len < sizeof(params)) {
7448 len = sizeof(params);
7449 if (copy_from_user(¶ms, optval, len))
7452 asoc = sctp_id2assoc(sk, params.assoc_id);
7453 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7454 sctp_style(sk, UDP)) {
7459 params.assoc_value = asoc ? asoc->peer.reconf_capable
7460 : sctp_sk(sk)->ep->reconf_enable;
7462 if (put_user(len, optlen))
7465 if (copy_to_user(optval, ¶ms, len))
7474 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7475 char __user *optval,
7478 struct sctp_assoc_value params;
7479 struct sctp_association *asoc;
7480 int retval = -EFAULT;
7482 if (len < sizeof(params)) {
7487 len = sizeof(params);
7488 if (copy_from_user(¶ms, optval, len))
7491 asoc = sctp_id2assoc(sk, params.assoc_id);
7492 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7493 sctp_style(sk, UDP)) {
7498 params.assoc_value = asoc ? asoc->strreset_enable
7499 : sctp_sk(sk)->ep->strreset_enable;
7501 if (put_user(len, optlen))
7504 if (copy_to_user(optval, ¶ms, len))
7513 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7514 char __user *optval,
7517 struct sctp_assoc_value params;
7518 struct sctp_association *asoc;
7519 int retval = -EFAULT;
7521 if (len < sizeof(params)) {
7526 len = sizeof(params);
7527 if (copy_from_user(¶ms, optval, len))
7530 asoc = sctp_id2assoc(sk, params.assoc_id);
7531 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7532 sctp_style(sk, UDP)) {
7537 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7538 : sctp_sk(sk)->default_ss;
7540 if (put_user(len, optlen))
7543 if (copy_to_user(optval, ¶ms, len))
7552 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7553 char __user *optval,
7556 struct sctp_stream_value params;
7557 struct sctp_association *asoc;
7558 int retval = -EFAULT;
7560 if (len < sizeof(params)) {
7565 len = sizeof(params);
7566 if (copy_from_user(¶ms, optval, len))
7569 asoc = sctp_id2assoc(sk, params.assoc_id);
7575 retval = sctp_sched_get_value(asoc, params.stream_id,
7576 ¶ms.stream_value);
7580 if (put_user(len, optlen)) {
7585 if (copy_to_user(optval, ¶ms, len)) {
7594 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7595 char __user *optval,
7598 struct sctp_assoc_value params;
7599 struct sctp_association *asoc;
7600 int retval = -EFAULT;
7602 if (len < sizeof(params)) {
7607 len = sizeof(params);
7608 if (copy_from_user(¶ms, optval, len))
7611 asoc = sctp_id2assoc(sk, params.assoc_id);
7612 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7613 sctp_style(sk, UDP)) {
7618 params.assoc_value = asoc ? asoc->peer.intl_capable
7619 : sctp_sk(sk)->ep->intl_enable;
7621 if (put_user(len, optlen))
7624 if (copy_to_user(optval, ¶ms, len))
7633 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7634 char __user *optval,
7639 if (len < sizeof(int))
7643 val = sctp_sk(sk)->reuse;
7644 if (put_user(len, optlen))
7647 if (copy_to_user(optval, &val, len))
7653 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7656 struct sctp_association *asoc;
7657 struct sctp_event param;
7660 if (len < sizeof(param))
7663 len = sizeof(param);
7664 if (copy_from_user(¶m, optval, len))
7667 if (param.se_type < SCTP_SN_TYPE_BASE ||
7668 param.se_type > SCTP_SN_TYPE_MAX)
7671 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7672 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7673 sctp_style(sk, UDP))
7676 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7677 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7679 if (put_user(len, optlen))
7682 if (copy_to_user(optval, ¶m, len))
7688 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7689 char __user *optval,
7692 struct sctp_assoc_value params;
7693 struct sctp_association *asoc;
7694 int retval = -EFAULT;
7696 if (len < sizeof(params)) {
7701 len = sizeof(params);
7702 if (copy_from_user(¶ms, optval, len))
7705 asoc = sctp_id2assoc(sk, params.assoc_id);
7706 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7707 sctp_style(sk, UDP)) {
7712 params.assoc_value = asoc ? asoc->peer.asconf_capable
7713 : sctp_sk(sk)->ep->asconf_enable;
7715 if (put_user(len, optlen))
7718 if (copy_to_user(optval, ¶ms, len))
7727 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7728 char __user *optval,
7731 struct sctp_assoc_value params;
7732 struct sctp_association *asoc;
7733 int retval = -EFAULT;
7735 if (len < sizeof(params)) {
7740 len = sizeof(params);
7741 if (copy_from_user(¶ms, optval, len))
7744 asoc = sctp_id2assoc(sk, params.assoc_id);
7745 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7746 sctp_style(sk, UDP)) {
7751 params.assoc_value = asoc ? asoc->peer.auth_capable
7752 : sctp_sk(sk)->ep->auth_enable;
7754 if (put_user(len, optlen))
7757 if (copy_to_user(optval, ¶ms, len))
7766 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7767 char __user *optval,
7770 struct sctp_assoc_value params;
7771 struct sctp_association *asoc;
7772 int retval = -EFAULT;
7774 if (len < sizeof(params)) {
7779 len = sizeof(params);
7780 if (copy_from_user(¶ms, optval, len))
7783 asoc = sctp_id2assoc(sk, params.assoc_id);
7784 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7785 sctp_style(sk, UDP)) {
7790 params.assoc_value = asoc ? asoc->peer.ecn_capable
7791 : sctp_sk(sk)->ep->ecn_enable;
7793 if (put_user(len, optlen))
7796 if (copy_to_user(optval, ¶ms, len))
7805 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7806 char __user *optval,
7809 struct sctp_assoc_value params;
7810 struct sctp_association *asoc;
7811 int retval = -EFAULT;
7813 if (len < sizeof(params)) {
7818 len = sizeof(params);
7819 if (copy_from_user(¶ms, optval, len))
7822 asoc = sctp_id2assoc(sk, params.assoc_id);
7823 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7824 sctp_style(sk, UDP)) {
7829 params.assoc_value = asoc ? asoc->pf_expose
7830 : sctp_sk(sk)->pf_expose;
7832 if (put_user(len, optlen))
7835 if (copy_to_user(optval, ¶ms, len))
7844 static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7845 char __user *optval, int __user *optlen)
7847 struct sctp_association *asoc;
7848 struct sctp_udpencaps encap;
7849 struct sctp_transport *t;
7852 if (len < sizeof(encap))
7855 len = sizeof(encap);
7856 if (copy_from_user(&encap, optval, len))
7859 /* If an address other than INADDR_ANY is specified, and
7860 * no transport is found, then the request is invalid.
7862 if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7863 t = sctp_addr_id2transport(sk, &encap.sue_address,
7864 encap.sue_assoc_id);
7866 pr_debug("%s: failed no transport\n", __func__);
7870 encap_port = t->encap_port;
7874 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7875 * socket is a one to many style socket, and an association
7876 * was not found, then the id was invalid.
7878 asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7879 if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7880 sctp_style(sk, UDP)) {
7881 pr_debug("%s: failed no association\n", __func__);
7886 encap_port = asoc->encap_port;
7890 encap_port = sctp_sk(sk)->encap_port;
7893 encap.sue_port = (__force uint16_t)encap_port;
7894 if (copy_to_user(optval, &encap, len))
7897 if (put_user(len, optlen))
7903 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7904 char __user *optval, int __user *optlen)
7909 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7911 /* I can hardly begin to describe how wrong this is. This is
7912 * so broken as to be worse than useless. The API draft
7913 * REALLY is NOT helpful here... I am not convinced that the
7914 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7915 * are at all well-founded.
7917 if (level != SOL_SCTP) {
7918 struct sctp_af *af = sctp_sk(sk)->pf->af;
7920 retval = af->getsockopt(sk, level, optname, optval, optlen);
7924 if (get_user(len, optlen))
7934 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7936 case SCTP_DISABLE_FRAGMENTS:
7937 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7941 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7943 case SCTP_AUTOCLOSE:
7944 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7946 case SCTP_SOCKOPT_PEELOFF:
7947 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7949 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7950 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7952 case SCTP_PEER_ADDR_PARAMS:
7953 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7956 case SCTP_DELAYED_SACK:
7957 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7961 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7963 case SCTP_GET_PEER_ADDRS:
7964 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7967 case SCTP_GET_LOCAL_ADDRS:
7968 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7971 case SCTP_SOCKOPT_CONNECTX3:
7972 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7974 case SCTP_DEFAULT_SEND_PARAM:
7975 retval = sctp_getsockopt_default_send_param(sk, len,
7978 case SCTP_DEFAULT_SNDINFO:
7979 retval = sctp_getsockopt_default_sndinfo(sk, len,
7982 case SCTP_PRIMARY_ADDR:
7983 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7986 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7989 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7991 case SCTP_ASSOCINFO:
7992 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7994 case SCTP_I_WANT_MAPPED_V4_ADDR:
7995 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7998 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8000 case SCTP_GET_PEER_ADDR_INFO:
8001 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8004 case SCTP_ADAPTATION_LAYER:
8005 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8009 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8011 case SCTP_FRAGMENT_INTERLEAVE:
8012 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8015 case SCTP_PARTIAL_DELIVERY_POINT:
8016 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8019 case SCTP_MAX_BURST:
8020 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8023 case SCTP_AUTH_CHUNK:
8024 case SCTP_AUTH_DELETE_KEY:
8025 case SCTP_AUTH_DEACTIVATE_KEY:
8026 retval = -EOPNOTSUPP;
8028 case SCTP_HMAC_IDENT:
8029 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8031 case SCTP_AUTH_ACTIVE_KEY:
8032 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8034 case SCTP_PEER_AUTH_CHUNKS:
8035 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8038 case SCTP_LOCAL_AUTH_CHUNKS:
8039 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8042 case SCTP_GET_ASSOC_NUMBER:
8043 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8045 case SCTP_GET_ASSOC_ID_LIST:
8046 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8048 case SCTP_AUTO_ASCONF:
8049 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8051 case SCTP_PEER_ADDR_THLDS:
8052 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8055 case SCTP_PEER_ADDR_THLDS_V2:
8056 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8059 case SCTP_GET_ASSOC_STATS:
8060 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8062 case SCTP_RECVRCVINFO:
8063 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8065 case SCTP_RECVNXTINFO:
8066 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8068 case SCTP_PR_SUPPORTED:
8069 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8071 case SCTP_DEFAULT_PRINFO:
8072 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8075 case SCTP_PR_ASSOC_STATUS:
8076 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8079 case SCTP_PR_STREAM_STATUS:
8080 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8083 case SCTP_RECONFIG_SUPPORTED:
8084 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8087 case SCTP_ENABLE_STREAM_RESET:
8088 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8091 case SCTP_STREAM_SCHEDULER:
8092 retval = sctp_getsockopt_scheduler(sk, len, optval,
8095 case SCTP_STREAM_SCHEDULER_VALUE:
8096 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8099 case SCTP_INTERLEAVING_SUPPORTED:
8100 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8103 case SCTP_REUSE_PORT:
8104 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8107 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8109 case SCTP_ASCONF_SUPPORTED:
8110 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8113 case SCTP_AUTH_SUPPORTED:
8114 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8117 case SCTP_ECN_SUPPORTED:
8118 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8120 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8121 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8123 case SCTP_REMOTE_UDP_ENCAPS_PORT:
8124 retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8127 retval = -ENOPROTOOPT;
8135 static int sctp_hash(struct sock *sk)
8141 static void sctp_unhash(struct sock *sk)
8146 /* Check if port is acceptable. Possibly find first available port.
8148 * The port hash table (contained in the 'global' SCTP protocol storage
8149 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8150 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8151 * list (the list number is the port number hashed out, so as you
8152 * would expect from a hash function, all the ports in a given list have
8153 * such a number that hashes out to the same list number; you were
8154 * expecting that, right?); so each list has a set of ports, with a
8155 * link to the socket (struct sock) that uses it, the port number and
8156 * a fastreuse flag (FIXME: NPI ipg).
8158 static struct sctp_bind_bucket *sctp_bucket_create(
8159 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8161 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8163 struct sctp_sock *sp = sctp_sk(sk);
8164 bool reuse = (sk->sk_reuse || sp->reuse);
8165 struct sctp_bind_hashbucket *head; /* hash list */
8166 struct net *net = sock_net(sk);
8167 kuid_t uid = sock_i_uid(sk);
8168 struct sctp_bind_bucket *pp;
8169 unsigned short snum;
8172 snum = ntohs(addr->v4.sin_port);
8174 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8177 /* Search for an available port. */
8178 int low, high, remaining, index;
8181 inet_get_local_port_range(net, &low, &high);
8182 remaining = (high - low) + 1;
8183 rover = prandom_u32() % remaining + low;
8187 if ((rover < low) || (rover > high))
8189 if (inet_is_local_reserved_port(net, rover))
8191 index = sctp_phashfn(net, rover);
8192 head = &sctp_port_hashtable[index];
8193 spin_lock_bh(&head->lock);
8194 sctp_for_each_hentry(pp, &head->chain)
8195 if ((pp->port == rover) &&
8196 net_eq(net, pp->net))
8200 spin_unlock_bh(&head->lock);
8202 } while (--remaining > 0);
8204 /* Exhausted local port range during search? */
8209 /* OK, here is the one we will use. HEAD (the port
8210 * hash table list entry) is non-NULL and we hold it's
8215 /* We are given an specific port number; we verify
8216 * that it is not being used. If it is used, we will
8217 * exahust the search in the hash list corresponding
8218 * to the port number (snum) - we detect that with the
8219 * port iterator, pp being NULL.
8221 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8222 spin_lock_bh(&head->lock);
8223 sctp_for_each_hentry(pp, &head->chain) {
8224 if ((pp->port == snum) && net_eq(pp->net, net))
8231 if (!hlist_empty(&pp->owner)) {
8232 /* We had a port hash table hit - there is an
8233 * available port (pp != NULL) and it is being
8234 * used by other socket (pp->owner not empty); that other
8235 * socket is going to be sk2.
8239 pr_debug("%s: found a possible match\n", __func__);
8241 if ((pp->fastreuse && reuse &&
8242 sk->sk_state != SCTP_SS_LISTENING) ||
8243 (pp->fastreuseport && sk->sk_reuseport &&
8244 uid_eq(pp->fastuid, uid)))
8247 /* Run through the list of sockets bound to the port
8248 * (pp->port) [via the pointers bind_next and
8249 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8250 * we get the endpoint they describe and run through
8251 * the endpoint's list of IP (v4 or v6) addresses,
8252 * comparing each of the addresses with the address of
8253 * the socket sk. If we find a match, then that means
8254 * that this port/socket (sk) combination are already
8257 sk_for_each_bound(sk2, &pp->owner) {
8258 struct sctp_sock *sp2 = sctp_sk(sk2);
8259 struct sctp_endpoint *ep2 = sp2->ep;
8262 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8263 sk2->sk_state != SCTP_SS_LISTENING) ||
8264 (sk->sk_reuseport && sk2->sk_reuseport &&
8265 uid_eq(uid, sock_i_uid(sk2))))
8268 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8275 pr_debug("%s: found a match\n", __func__);
8278 /* If there was a hash table miss, create a new port. */
8280 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8283 /* In either case (hit or miss), make sure fastreuse is 1 only
8284 * if sk->sk_reuse is too (that is, if the caller requested
8285 * SO_REUSEADDR on this socket -sk-).
8287 if (hlist_empty(&pp->owner)) {
8288 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8293 if (sk->sk_reuseport) {
8294 pp->fastreuseport = 1;
8297 pp->fastreuseport = 0;
8300 if (pp->fastreuse &&
8301 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8304 if (pp->fastreuseport &&
8305 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8306 pp->fastreuseport = 0;
8309 /* We are set, so fill up all the data in the hash table
8310 * entry, tie the socket list information with the rest of the
8311 * sockets FIXME: Blurry, NPI (ipg).
8314 if (!sp->bind_hash) {
8315 inet_sk(sk)->inet_num = snum;
8316 sk_add_bind_node(sk, &pp->owner);
8322 spin_unlock_bh(&head->lock);
8326 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8327 * port is requested.
8329 static int sctp_get_port(struct sock *sk, unsigned short snum)
8331 union sctp_addr addr;
8332 struct sctp_af *af = sctp_sk(sk)->pf->af;
8334 /* Set up a dummy address struct from the sk. */
8335 af->from_sk(&addr, sk);
8336 addr.v4.sin_port = htons(snum);
8338 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8339 return sctp_get_port_local(sk, &addr);
8343 * Move a socket to LISTENING state.
8345 static int sctp_listen_start(struct sock *sk, int backlog)
8347 struct sctp_sock *sp = sctp_sk(sk);
8348 struct sctp_endpoint *ep = sp->ep;
8349 struct crypto_shash *tfm = NULL;
8352 /* Allocate HMAC for generating cookie. */
8353 if (!sp->hmac && sp->sctp_hmac_alg) {
8354 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8355 tfm = crypto_alloc_shash(alg, 0, 0);
8357 net_info_ratelimited("failed to load transform for %s: %ld\n",
8358 sp->sctp_hmac_alg, PTR_ERR(tfm));
8361 sctp_sk(sk)->hmac = tfm;
8365 * If a bind() or sctp_bindx() is not called prior to a listen()
8366 * call that allows new associations to be accepted, the system
8367 * picks an ephemeral port and will choose an address set equivalent
8368 * to binding with a wildcard address.
8370 * This is not currently spelled out in the SCTP sockets
8371 * extensions draft, but follows the practice as seen in TCP
8375 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8376 if (!ep->base.bind_addr.port) {
8377 if (sctp_autobind(sk))
8380 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8381 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8386 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8387 return sctp_hash_endpoint(ep);
8391 * 4.1.3 / 5.1.3 listen()
8393 * By default, new associations are not accepted for UDP style sockets.
8394 * An application uses listen() to mark a socket as being able to
8395 * accept new associations.
8397 * On TCP style sockets, applications use listen() to ready the SCTP
8398 * endpoint for accepting inbound associations.
8400 * On both types of endpoints a backlog of '0' disables listening.
8402 * Move a socket to LISTENING state.
8404 int sctp_inet_listen(struct socket *sock, int backlog)
8406 struct sock *sk = sock->sk;
8407 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8410 if (unlikely(backlog < 0))
8415 /* Peeled-off sockets are not allowed to listen(). */
8416 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8419 if (sock->state != SS_UNCONNECTED)
8422 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8425 /* If backlog is zero, disable listening. */
8427 if (sctp_sstate(sk, CLOSED))
8431 sctp_unhash_endpoint(ep);
8432 sk->sk_state = SCTP_SS_CLOSED;
8433 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8434 sctp_sk(sk)->bind_hash->fastreuse = 1;
8438 /* If we are already listening, just update the backlog */
8439 if (sctp_sstate(sk, LISTENING))
8440 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8442 err = sctp_listen_start(sk, backlog);
8454 * This function is done by modeling the current datagram_poll() and the
8455 * tcp_poll(). Note that, based on these implementations, we don't
8456 * lock the socket in this function, even though it seems that,
8457 * ideally, locking or some other mechanisms can be used to ensure
8458 * the integrity of the counters (sndbuf and wmem_alloc) used
8459 * in this place. We assume that we don't need locks either until proven
8462 * Another thing to note is that we include the Async I/O support
8463 * here, again, by modeling the current TCP/UDP code. We don't have
8464 * a good way to test with it yet.
8466 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8468 struct sock *sk = sock->sk;
8469 struct sctp_sock *sp = sctp_sk(sk);
8472 poll_wait(file, sk_sleep(sk), wait);
8474 sock_rps_record_flow(sk);
8476 /* A TCP-style listening socket becomes readable when the accept queue
8479 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8480 return (!list_empty(&sp->ep->asocs)) ?
8481 (EPOLLIN | EPOLLRDNORM) : 0;
8485 /* Is there any exceptional events? */
8486 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8488 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8489 if (sk->sk_shutdown & RCV_SHUTDOWN)
8490 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8491 if (sk->sk_shutdown == SHUTDOWN_MASK)
8494 /* Is it readable? Reconsider this code with TCP-style support. */
8495 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8496 mask |= EPOLLIN | EPOLLRDNORM;
8498 /* The association is either gone or not ready. */
8499 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8502 /* Is it writable? */
8503 if (sctp_writeable(sk)) {
8504 mask |= EPOLLOUT | EPOLLWRNORM;
8506 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8508 * Since the socket is not locked, the buffer
8509 * might be made available after the writeable check and
8510 * before the bit is set. This could cause a lost I/O
8511 * signal. tcp_poll() has a race breaker for this race
8512 * condition. Based on their implementation, we put
8513 * in the following code to cover it as well.
8515 if (sctp_writeable(sk))
8516 mask |= EPOLLOUT | EPOLLWRNORM;
8521 /********************************************************************
8522 * 2nd Level Abstractions
8523 ********************************************************************/
8525 static struct sctp_bind_bucket *sctp_bucket_create(
8526 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8528 struct sctp_bind_bucket *pp;
8530 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8532 SCTP_DBG_OBJCNT_INC(bind_bucket);
8535 INIT_HLIST_HEAD(&pp->owner);
8537 hlist_add_head(&pp->node, &head->chain);
8542 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8543 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8545 if (pp && hlist_empty(&pp->owner)) {
8546 __hlist_del(&pp->node);
8547 kmem_cache_free(sctp_bucket_cachep, pp);
8548 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8552 /* Release this socket's reference to a local port. */
8553 static inline void __sctp_put_port(struct sock *sk)
8555 struct sctp_bind_hashbucket *head =
8556 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8557 inet_sk(sk)->inet_num)];
8558 struct sctp_bind_bucket *pp;
8560 spin_lock(&head->lock);
8561 pp = sctp_sk(sk)->bind_hash;
8562 __sk_del_bind_node(sk);
8563 sctp_sk(sk)->bind_hash = NULL;
8564 inet_sk(sk)->inet_num = 0;
8565 sctp_bucket_destroy(pp);
8566 spin_unlock(&head->lock);
8569 void sctp_put_port(struct sock *sk)
8572 __sctp_put_port(sk);
8577 * The system picks an ephemeral port and choose an address set equivalent
8578 * to binding with a wildcard address.
8579 * One of those addresses will be the primary address for the association.
8580 * This automatically enables the multihoming capability of SCTP.
8582 static int sctp_autobind(struct sock *sk)
8584 union sctp_addr autoaddr;
8588 /* Initialize a local sockaddr structure to INADDR_ANY. */
8589 af = sctp_sk(sk)->pf->af;
8591 port = htons(inet_sk(sk)->inet_num);
8592 af->inaddr_any(&autoaddr, port);
8594 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8597 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8600 * 4.2 The cmsghdr Structure *
8602 * When ancillary data is sent or received, any number of ancillary data
8603 * objects can be specified by the msg_control and msg_controllen members of
8604 * the msghdr structure, because each object is preceded by
8605 * a cmsghdr structure defining the object's length (the cmsg_len member).
8606 * Historically Berkeley-derived implementations have passed only one object
8607 * at a time, but this API allows multiple objects to be
8608 * passed in a single call to sendmsg() or recvmsg(). The following example
8609 * shows two ancillary data objects in a control buffer.
8611 * |<--------------------------- msg_controllen -------------------------->|
8614 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8616 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8619 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8621 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8624 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8625 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8627 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8629 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8636 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8638 struct msghdr *my_msg = (struct msghdr *)msg;
8639 struct cmsghdr *cmsg;
8641 for_each_cmsghdr(cmsg, my_msg) {
8642 if (!CMSG_OK(my_msg, cmsg))
8645 /* Should we parse this header or ignore? */
8646 if (cmsg->cmsg_level != IPPROTO_SCTP)
8649 /* Strictly check lengths following example in SCM code. */
8650 switch (cmsg->cmsg_type) {
8652 /* SCTP Socket API Extension
8653 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8655 * This cmsghdr structure provides information for
8656 * initializing new SCTP associations with sendmsg().
8657 * The SCTP_INITMSG socket option uses this same data
8658 * structure. This structure is not used for
8661 * cmsg_level cmsg_type cmsg_data[]
8662 * ------------ ------------ ----------------------
8663 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8665 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8668 cmsgs->init = CMSG_DATA(cmsg);
8672 /* SCTP Socket API Extension
8673 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8675 * This cmsghdr structure specifies SCTP options for
8676 * sendmsg() and describes SCTP header information
8677 * about a received message through recvmsg().
8679 * cmsg_level cmsg_type cmsg_data[]
8680 * ------------ ------------ ----------------------
8681 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8683 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8686 cmsgs->srinfo = CMSG_DATA(cmsg);
8688 if (cmsgs->srinfo->sinfo_flags &
8689 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8690 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8691 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8696 /* SCTP Socket API Extension
8697 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8699 * This cmsghdr structure specifies SCTP options for
8700 * sendmsg(). This structure and SCTP_RCVINFO replaces
8701 * SCTP_SNDRCV which has been deprecated.
8703 * cmsg_level cmsg_type cmsg_data[]
8704 * ------------ ------------ ---------------------
8705 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8707 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8710 cmsgs->sinfo = CMSG_DATA(cmsg);
8712 if (cmsgs->sinfo->snd_flags &
8713 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8714 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8715 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8719 /* SCTP Socket API Extension
8720 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8722 * This cmsghdr structure specifies SCTP options for sendmsg().
8724 * cmsg_level cmsg_type cmsg_data[]
8725 * ------------ ------------ ---------------------
8726 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8728 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8731 cmsgs->prinfo = CMSG_DATA(cmsg);
8732 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8735 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8736 cmsgs->prinfo->pr_value = 0;
8739 /* SCTP Socket API Extension
8740 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8742 * This cmsghdr structure specifies SCTP options for sendmsg().
8744 * cmsg_level cmsg_type cmsg_data[]
8745 * ------------ ------------ ---------------------
8746 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8748 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8751 cmsgs->authinfo = CMSG_DATA(cmsg);
8753 case SCTP_DSTADDRV4:
8754 case SCTP_DSTADDRV6:
8755 /* SCTP Socket API Extension
8756 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8758 * This cmsghdr structure specifies SCTP options for sendmsg().
8760 * cmsg_level cmsg_type cmsg_data[]
8761 * ------------ ------------ ---------------------
8762 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8763 * ------------ ------------ ---------------------
8764 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8766 cmsgs->addrs_msg = my_msg;
8777 * Wait for a packet..
8778 * Note: This function is the same function as in core/datagram.c
8779 * with a few modifications to make lksctp work.
8781 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8786 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8788 /* Socket errors? */
8789 error = sock_error(sk);
8793 if (!skb_queue_empty(&sk->sk_receive_queue))
8796 /* Socket shut down? */
8797 if (sk->sk_shutdown & RCV_SHUTDOWN)
8800 /* Sequenced packets can come disconnected. If so we report the
8805 /* Is there a good reason to think that we may receive some data? */
8806 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8809 /* Handle signals. */
8810 if (signal_pending(current))
8813 /* Let another process have a go. Since we are going to sleep
8814 * anyway. Note: This may cause odd behaviors if the message
8815 * does not fit in the user's buffer, but this seems to be the
8816 * only way to honor MSG_DONTWAIT realistically.
8819 *timeo_p = schedule_timeout(*timeo_p);
8823 finish_wait(sk_sleep(sk), &wait);
8827 error = sock_intr_errno(*timeo_p);
8830 finish_wait(sk_sleep(sk), &wait);
8835 /* Receive a datagram.
8836 * Note: This is pretty much the same routine as in core/datagram.c
8837 * with a few changes to make lksctp work.
8839 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8840 int noblock, int *err)
8843 struct sk_buff *skb;
8846 timeo = sock_rcvtimeo(sk, noblock);
8848 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8849 MAX_SCHEDULE_TIMEOUT);
8852 /* Again only user level code calls this function,
8853 * so nothing interrupt level
8854 * will suddenly eat the receive_queue.
8856 * Look at current nfs client by the way...
8857 * However, this function was correct in any case. 8)
8859 if (flags & MSG_PEEK) {
8860 skb = skb_peek(&sk->sk_receive_queue);
8862 refcount_inc(&skb->users);
8864 skb = __skb_dequeue(&sk->sk_receive_queue);
8870 /* Caller is allowed not to check sk->sk_err before calling. */
8871 error = sock_error(sk);
8875 if (sk->sk_shutdown & RCV_SHUTDOWN)
8878 if (sk_can_busy_loop(sk)) {
8879 sk_busy_loop(sk, noblock);
8881 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8885 /* User doesn't want to wait. */
8889 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8898 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8899 static void __sctp_write_space(struct sctp_association *asoc)
8901 struct sock *sk = asoc->base.sk;
8903 if (sctp_wspace(asoc) <= 0)
8906 if (waitqueue_active(&asoc->wait))
8907 wake_up_interruptible(&asoc->wait);
8909 if (sctp_writeable(sk)) {
8910 struct socket_wq *wq;
8913 wq = rcu_dereference(sk->sk_wq);
8915 if (waitqueue_active(&wq->wait))
8916 wake_up_interruptible(&wq->wait);
8918 /* Note that we try to include the Async I/O support
8919 * here by modeling from the current TCP/UDP code.
8920 * We have not tested with it yet.
8922 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8923 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8929 static void sctp_wake_up_waiters(struct sock *sk,
8930 struct sctp_association *asoc)
8932 struct sctp_association *tmp = asoc;
8934 /* We do accounting for the sndbuf space per association,
8935 * so we only need to wake our own association.
8937 if (asoc->ep->sndbuf_policy)
8938 return __sctp_write_space(asoc);
8940 /* If association goes down and is just flushing its
8941 * outq, then just normally notify others.
8943 if (asoc->base.dead)
8944 return sctp_write_space(sk);
8946 /* Accounting for the sndbuf space is per socket, so we
8947 * need to wake up others, try to be fair and in case of
8948 * other associations, let them have a go first instead
8949 * of just doing a sctp_write_space() call.
8951 * Note that we reach sctp_wake_up_waiters() only when
8952 * associations free up queued chunks, thus we are under
8953 * lock and the list of associations on a socket is
8954 * guaranteed not to change.
8956 for (tmp = list_next_entry(tmp, asocs); 1;
8957 tmp = list_next_entry(tmp, asocs)) {
8958 /* Manually skip the head element. */
8959 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8961 /* Wake up association. */
8962 __sctp_write_space(tmp);
8963 /* We've reached the end. */
8969 /* Do accounting for the sndbuf space.
8970 * Decrement the used sndbuf space of the corresponding association by the
8971 * data size which was just transmitted(freed).
8973 static void sctp_wfree(struct sk_buff *skb)
8975 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8976 struct sctp_association *asoc = chunk->asoc;
8977 struct sock *sk = asoc->base.sk;
8979 sk_mem_uncharge(sk, skb->truesize);
8980 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8981 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8982 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8983 &sk->sk_wmem_alloc));
8986 struct sctp_shared_key *shkey = chunk->shkey;
8988 /* refcnt == 2 and !list_empty mean after this release, it's
8989 * not being used anywhere, and it's time to notify userland
8990 * that this shkey can be freed if it's been deactivated.
8992 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8993 refcount_read(&shkey->refcnt) == 2) {
8994 struct sctp_ulpevent *ev;
8996 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9000 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9002 sctp_auth_shkey_release(chunk->shkey);
9006 sctp_wake_up_waiters(sk, asoc);
9008 sctp_association_put(asoc);
9011 /* Do accounting for the receive space on the socket.
9012 * Accounting for the association is done in ulpevent.c
9013 * We set this as a destructor for the cloned data skbs so that
9014 * accounting is done at the correct time.
9016 void sctp_sock_rfree(struct sk_buff *skb)
9018 struct sock *sk = skb->sk;
9019 struct sctp_ulpevent *event = sctp_skb2event(skb);
9021 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9024 * Mimic the behavior of sock_rfree
9026 sk_mem_uncharge(sk, event->rmem_len);
9030 /* Helper function to wait for space in the sndbuf. */
9031 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9034 struct sock *sk = asoc->base.sk;
9035 long current_timeo = *timeo_p;
9039 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9042 /* Increment the association's refcnt. */
9043 sctp_association_hold(asoc);
9045 /* Wait on the association specific sndbuf space. */
9047 prepare_to_wait_exclusive(&asoc->wait, &wait,
9048 TASK_INTERRUPTIBLE);
9049 if (asoc->base.dead)
9053 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9055 if (signal_pending(current))
9056 goto do_interrupted;
9057 if (sk_under_memory_pressure(sk))
9059 if ((int)msg_len <= sctp_wspace(asoc) &&
9060 sk_wmem_schedule(sk, msg_len))
9063 /* Let another process have a go. Since we are going
9067 current_timeo = schedule_timeout(current_timeo);
9069 if (sk != asoc->base.sk)
9072 *timeo_p = current_timeo;
9076 finish_wait(&asoc->wait, &wait);
9078 /* Release the association's refcnt. */
9079 sctp_association_put(asoc);
9092 err = sock_intr_errno(*timeo_p);
9100 void sctp_data_ready(struct sock *sk)
9102 struct socket_wq *wq;
9105 wq = rcu_dereference(sk->sk_wq);
9106 if (skwq_has_sleeper(wq))
9107 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9108 EPOLLRDNORM | EPOLLRDBAND);
9109 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9113 /* If socket sndbuf has changed, wake up all per association waiters. */
9114 void sctp_write_space(struct sock *sk)
9116 struct sctp_association *asoc;
9118 /* Wake up the tasks in each wait queue. */
9119 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9120 __sctp_write_space(asoc);
9124 /* Is there any sndbuf space available on the socket?
9126 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9127 * associations on the same socket. For a UDP-style socket with
9128 * multiple associations, it is possible for it to be "unwriteable"
9129 * prematurely. I assume that this is acceptable because
9130 * a premature "unwriteable" is better than an accidental "writeable" which
9131 * would cause an unwanted block under certain circumstances. For the 1-1
9132 * UDP-style sockets or TCP-style sockets, this code should work.
9135 static bool sctp_writeable(struct sock *sk)
9137 return sk->sk_sndbuf > sk->sk_wmem_queued;
9140 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9141 * returns immediately with EINPROGRESS.
9143 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9145 struct sock *sk = asoc->base.sk;
9147 long current_timeo = *timeo_p;
9150 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9152 /* Increment the association's refcnt. */
9153 sctp_association_hold(asoc);
9156 prepare_to_wait_exclusive(&asoc->wait, &wait,
9157 TASK_INTERRUPTIBLE);
9160 if (sk->sk_shutdown & RCV_SHUTDOWN)
9162 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9165 if (signal_pending(current))
9166 goto do_interrupted;
9168 if (sctp_state(asoc, ESTABLISHED))
9171 /* Let another process have a go. Since we are going
9175 current_timeo = schedule_timeout(current_timeo);
9178 *timeo_p = current_timeo;
9182 finish_wait(&asoc->wait, &wait);
9184 /* Release the association's refcnt. */
9185 sctp_association_put(asoc);
9190 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9193 err = -ECONNREFUSED;
9197 err = sock_intr_errno(*timeo_p);
9205 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9207 struct sctp_endpoint *ep;
9211 ep = sctp_sk(sk)->ep;
9215 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9216 TASK_INTERRUPTIBLE);
9218 if (list_empty(&ep->asocs)) {
9220 timeo = schedule_timeout(timeo);
9225 if (!sctp_sstate(sk, LISTENING))
9229 if (!list_empty(&ep->asocs))
9232 err = sock_intr_errno(timeo);
9233 if (signal_pending(current))
9241 finish_wait(sk_sleep(sk), &wait);
9246 static void sctp_wait_for_close(struct sock *sk, long timeout)
9251 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9252 if (list_empty(&sctp_sk(sk)->ep->asocs))
9255 timeout = schedule_timeout(timeout);
9257 } while (!signal_pending(current) && timeout);
9259 finish_wait(sk_sleep(sk), &wait);
9262 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9264 struct sk_buff *frag;
9269 /* Don't forget the fragments. */
9270 skb_walk_frags(skb, frag)
9271 sctp_skb_set_owner_r_frag(frag, sk);
9274 sctp_skb_set_owner_r(skb, sk);
9277 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9278 struct sctp_association *asoc)
9280 struct inet_sock *inet = inet_sk(sk);
9281 struct inet_sock *newinet;
9282 struct sctp_sock *sp = sctp_sk(sk);
9283 struct sctp_endpoint *ep = sp->ep;
9285 newsk->sk_type = sk->sk_type;
9286 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9287 newsk->sk_flags = sk->sk_flags;
9288 newsk->sk_tsflags = sk->sk_tsflags;
9289 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9290 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9291 newsk->sk_reuse = sk->sk_reuse;
9292 sctp_sk(newsk)->reuse = sp->reuse;
9294 newsk->sk_shutdown = sk->sk_shutdown;
9295 newsk->sk_destruct = sctp_destruct_sock;
9296 newsk->sk_family = sk->sk_family;
9297 newsk->sk_protocol = IPPROTO_SCTP;
9298 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9299 newsk->sk_sndbuf = sk->sk_sndbuf;
9300 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9301 newsk->sk_lingertime = sk->sk_lingertime;
9302 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9303 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9304 newsk->sk_rxhash = sk->sk_rxhash;
9306 newinet = inet_sk(newsk);
9308 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9309 * getsockname() and getpeername()
9311 newinet->inet_sport = inet->inet_sport;
9312 newinet->inet_saddr = inet->inet_saddr;
9313 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9314 newinet->inet_dport = htons(asoc->peer.port);
9315 newinet->pmtudisc = inet->pmtudisc;
9316 newinet->inet_id = prandom_u32();
9318 newinet->uc_ttl = inet->uc_ttl;
9319 newinet->mc_loop = 1;
9320 newinet->mc_ttl = 1;
9321 newinet->mc_index = 0;
9322 newinet->mc_list = NULL;
9324 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9325 net_enable_timestamp();
9327 /* Set newsk security attributes from orginal sk and connection
9328 * security attribute from ep.
9330 security_sctp_sk_clone(ep, sk, newsk);
9333 static inline void sctp_copy_descendant(struct sock *sk_to,
9334 const struct sock *sk_from)
9336 size_t ancestor_size = sizeof(struct inet_sock);
9338 ancestor_size += sk_from->sk_prot->obj_size;
9339 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9340 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9343 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9344 * and its messages to the newsk.
9346 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9347 struct sctp_association *assoc,
9348 enum sctp_socket_type type)
9350 struct sctp_sock *oldsp = sctp_sk(oldsk);
9351 struct sctp_sock *newsp = sctp_sk(newsk);
9352 struct sctp_bind_bucket *pp; /* hash list port iterator */
9353 struct sctp_endpoint *newep = newsp->ep;
9354 struct sk_buff *skb, *tmp;
9355 struct sctp_ulpevent *event;
9356 struct sctp_bind_hashbucket *head;
9359 /* Migrate socket buffer sizes and all the socket level options to the
9362 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9363 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9364 /* Brute force copy old sctp opt. */
9365 sctp_copy_descendant(newsk, oldsk);
9367 /* Restore the ep value that was overwritten with the above structure
9373 /* Hook this new socket in to the bind_hash list. */
9374 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9375 inet_sk(oldsk)->inet_num)];
9376 spin_lock_bh(&head->lock);
9377 pp = sctp_sk(oldsk)->bind_hash;
9378 sk_add_bind_node(newsk, &pp->owner);
9379 sctp_sk(newsk)->bind_hash = pp;
9380 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9381 spin_unlock_bh(&head->lock);
9383 /* Copy the bind_addr list from the original endpoint to the new
9384 * endpoint so that we can handle restarts properly
9386 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9387 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9391 /* New ep's auth_hmacs should be set if old ep's is set, in case
9392 * that net->sctp.auth_enable has been changed to 0 by users and
9393 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9395 if (oldsp->ep->auth_hmacs) {
9396 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9401 /* Move any messages in the old socket's receive queue that are for the
9402 * peeled off association to the new socket's receive queue.
9404 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9405 event = sctp_skb2event(skb);
9406 if (event->asoc == assoc) {
9407 __skb_unlink(skb, &oldsk->sk_receive_queue);
9408 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9409 sctp_skb_set_owner_r_frag(skb, newsk);
9413 /* Clean up any messages pending delivery due to partial
9414 * delivery. Three cases:
9415 * 1) No partial deliver; no work.
9416 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9417 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9419 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9421 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9422 struct sk_buff_head *queue;
9424 /* Decide which queue to move pd_lobby skbs to. */
9425 if (assoc->ulpq.pd_mode) {
9426 queue = &newsp->pd_lobby;
9428 queue = &newsk->sk_receive_queue;
9430 /* Walk through the pd_lobby, looking for skbs that
9431 * need moved to the new socket.
9433 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9434 event = sctp_skb2event(skb);
9435 if (event->asoc == assoc) {
9436 __skb_unlink(skb, &oldsp->pd_lobby);
9437 __skb_queue_tail(queue, skb);
9438 sctp_skb_set_owner_r_frag(skb, newsk);
9442 /* Clear up any skbs waiting for the partial
9443 * delivery to finish.
9445 if (assoc->ulpq.pd_mode)
9446 sctp_clear_pd(oldsk, NULL);
9450 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9452 /* Set the type of socket to indicate that it is peeled off from the
9453 * original UDP-style socket or created with the accept() call on a
9454 * TCP-style socket..
9458 /* Mark the new socket "in-use" by the user so that any packets
9459 * that may arrive on the association after we've moved it are
9460 * queued to the backlog. This prevents a potential race between
9461 * backlog processing on the old socket and new-packet processing
9462 * on the new socket.
9464 * The caller has just allocated newsk so we can guarantee that other
9465 * paths won't try to lock it and then oldsk.
9467 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9468 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9469 sctp_assoc_migrate(assoc, newsk);
9470 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9472 /* If the association on the newsk is already closed before accept()
9473 * is called, set RCV_SHUTDOWN flag.
9475 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9476 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9477 newsk->sk_shutdown |= RCV_SHUTDOWN;
9479 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9482 release_sock(newsk);
9488 /* This proto struct describes the ULP interface for SCTP. */
9489 struct proto sctp_prot = {
9491 .owner = THIS_MODULE,
9492 .close = sctp_close,
9493 .disconnect = sctp_disconnect,
9494 .accept = sctp_accept,
9495 .ioctl = sctp_ioctl,
9496 .init = sctp_init_sock,
9497 .destroy = sctp_destroy_sock,
9498 .shutdown = sctp_shutdown,
9499 .setsockopt = sctp_setsockopt,
9500 .getsockopt = sctp_getsockopt,
9501 .sendmsg = sctp_sendmsg,
9502 .recvmsg = sctp_recvmsg,
9504 .bind_add = sctp_bind_add,
9505 .backlog_rcv = sctp_backlog_rcv,
9507 .unhash = sctp_unhash,
9508 .no_autobind = true,
9509 .obj_size = sizeof(struct sctp_sock),
9510 .useroffset = offsetof(struct sctp_sock, subscribe),
9511 .usersize = offsetof(struct sctp_sock, initmsg) -
9512 offsetof(struct sctp_sock, subscribe) +
9513 sizeof_field(struct sctp_sock, initmsg),
9514 .sysctl_mem = sysctl_sctp_mem,
9515 .sysctl_rmem = sysctl_sctp_rmem,
9516 .sysctl_wmem = sysctl_sctp_wmem,
9517 .memory_pressure = &sctp_memory_pressure,
9518 .enter_memory_pressure = sctp_enter_memory_pressure,
9519 .memory_allocated = &sctp_memory_allocated,
9520 .sockets_allocated = &sctp_sockets_allocated,
9523 #if IS_ENABLED(CONFIG_IPV6)
9525 #include <net/transp_v6.h>
9526 static void sctp_v6_destroy_sock(struct sock *sk)
9528 sctp_destroy_sock(sk);
9529 inet6_destroy_sock(sk);
9532 struct proto sctpv6_prot = {
9534 .owner = THIS_MODULE,
9535 .close = sctp_close,
9536 .disconnect = sctp_disconnect,
9537 .accept = sctp_accept,
9538 .ioctl = sctp_ioctl,
9539 .init = sctp_init_sock,
9540 .destroy = sctp_v6_destroy_sock,
9541 .shutdown = sctp_shutdown,
9542 .setsockopt = sctp_setsockopt,
9543 .getsockopt = sctp_getsockopt,
9544 .sendmsg = sctp_sendmsg,
9545 .recvmsg = sctp_recvmsg,
9547 .bind_add = sctp_bind_add,
9548 .backlog_rcv = sctp_backlog_rcv,
9550 .unhash = sctp_unhash,
9551 .no_autobind = true,
9552 .obj_size = sizeof(struct sctp6_sock),
9553 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9554 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9555 offsetof(struct sctp6_sock, sctp.subscribe) +
9556 sizeof_field(struct sctp6_sock, sctp.initmsg),
9557 .sysctl_mem = sysctl_sctp_mem,
9558 .sysctl_rmem = sysctl_sctp_rmem,
9559 .sysctl_wmem = sysctl_sctp_wmem,
9560 .memory_pressure = &sctp_memory_pressure,
9561 .enter_memory_pressure = sctp_enter_memory_pressure,
9562 .memory_allocated = &sctp_memory_allocated,
9563 .sockets_allocated = &sctp_sockets_allocated,
9565 #endif /* IS_ENABLED(CONFIG_IPV6) */