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
23 * Written or modified by:
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.
1523 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1524 * held and that should be grabbed before socket lock.
1526 spin_lock_bh(&net->sctp.addr_wq_lock);
1527 bh_lock_sock_nested(sk);
1529 /* Hold the sock, since sk_common_release() will put sock_put()
1530 * and we have just a little more cleanup.
1533 sk_common_release(sk);
1536 spin_unlock_bh(&net->sctp.addr_wq_lock);
1540 SCTP_DBG_OBJCNT_DEC(sock);
1543 /* Handle EPIPE error. */
1544 static int sctp_error(struct sock *sk, int flags, int err)
1547 err = sock_error(sk) ? : -EPIPE;
1548 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1549 send_sig(SIGPIPE, current, 0);
1553 /* API 3.1.3 sendmsg() - UDP Style Syntax
1555 * An application uses sendmsg() and recvmsg() calls to transmit data to
1556 * and receive data from its peer.
1558 * ssize_t sendmsg(int socket, const struct msghdr *message,
1561 * socket - the socket descriptor of the endpoint.
1562 * message - pointer to the msghdr structure which contains a single
1563 * user message and possibly some ancillary data.
1565 * See Section 5 for complete description of the data
1568 * flags - flags sent or received with the user message, see Section
1569 * 5 for complete description of the flags.
1571 * Note: This function could use a rewrite especially when explicit
1572 * connect support comes in.
1574 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1576 static int sctp_msghdr_parse(const struct msghdr *msg,
1577 struct sctp_cmsgs *cmsgs);
1579 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1580 struct sctp_sndrcvinfo *srinfo,
1581 const struct msghdr *msg, size_t msg_len)
1586 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1589 if (msg_len > sk->sk_sndbuf)
1592 memset(cmsgs, 0, sizeof(*cmsgs));
1593 err = sctp_msghdr_parse(msg, cmsgs);
1595 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1599 memset(srinfo, 0, sizeof(*srinfo));
1600 if (cmsgs->srinfo) {
1601 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1602 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1603 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1604 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1605 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1606 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1610 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1611 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1612 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1613 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1614 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1617 if (cmsgs->prinfo) {
1618 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1619 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1620 cmsgs->prinfo->pr_policy);
1623 sflags = srinfo->sinfo_flags;
1624 if (!sflags && msg_len)
1627 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1630 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1631 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1634 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1640 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1641 struct sctp_cmsgs *cmsgs,
1642 union sctp_addr *daddr,
1643 struct sctp_transport **tp)
1645 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1646 struct sctp_association *asoc;
1647 struct cmsghdr *cmsg;
1648 __be32 flowinfo = 0;
1654 if (sflags & (SCTP_EOF | SCTP_ABORT))
1657 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1658 sctp_sstate(sk, CLOSING)))
1659 return -EADDRNOTAVAIL;
1661 /* Label connection socket for first association 1-to-many
1662 * style for client sequence socket()->sendmsg(). This
1663 * needs to be done before sctp_assoc_add_peer() as that will
1664 * set up the initial packet that needs to account for any
1665 * security ip options (CIPSO/CALIPSO) added to the packet.
1667 af = sctp_get_af_specific(daddr->sa.sa_family);
1670 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1671 (struct sockaddr *)daddr,
1676 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1681 if (!cmsgs->addrs_msg)
1684 if (daddr->sa.sa_family == AF_INET6)
1685 flowinfo = daddr->v6.sin6_flowinfo;
1687 /* sendv addr list parse */
1688 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1689 union sctp_addr _daddr;
1692 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1693 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1694 cmsg->cmsg_type != SCTP_DSTADDRV6))
1698 memset(daddr, 0, sizeof(*daddr));
1699 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1700 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1701 if (dlen < sizeof(struct in_addr)) {
1706 dlen = sizeof(struct in_addr);
1707 daddr->v4.sin_family = AF_INET;
1708 daddr->v4.sin_port = htons(asoc->peer.port);
1709 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1711 if (dlen < sizeof(struct in6_addr)) {
1716 dlen = sizeof(struct in6_addr);
1717 daddr->v6.sin6_flowinfo = flowinfo;
1718 daddr->v6.sin6_family = AF_INET6;
1719 daddr->v6.sin6_port = htons(asoc->peer.port);
1720 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1723 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1731 sctp_association_free(asoc);
1735 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1736 __u16 sflags, struct msghdr *msg,
1739 struct sock *sk = asoc->base.sk;
1740 struct net *net = sock_net(sk);
1742 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1745 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1746 !sctp_state(asoc, ESTABLISHED))
1749 if (sflags & SCTP_EOF) {
1750 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1751 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1756 if (sflags & SCTP_ABORT) {
1757 struct sctp_chunk *chunk;
1759 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1763 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1764 sctp_primitive_ABORT(net, asoc, chunk);
1765 iov_iter_revert(&msg->msg_iter, msg_len);
1773 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1774 struct msghdr *msg, size_t msg_len,
1775 struct sctp_transport *transport,
1776 struct sctp_sndrcvinfo *sinfo)
1778 struct sock *sk = asoc->base.sk;
1779 struct sctp_sock *sp = sctp_sk(sk);
1780 struct net *net = sock_net(sk);
1781 struct sctp_datamsg *datamsg;
1782 bool wait_connect = false;
1783 struct sctp_chunk *chunk;
1787 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1792 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1793 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1798 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1803 if (asoc->pmtu_pending) {
1804 if (sp->param_flags & SPP_PMTUD_ENABLE)
1805 sctp_assoc_sync_pmtu(asoc);
1806 asoc->pmtu_pending = 0;
1809 if (sctp_wspace(asoc) < (int)msg_len)
1810 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1812 if (sk_under_memory_pressure(sk))
1815 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1816 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1817 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1822 if (sctp_state(asoc, CLOSED)) {
1823 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1827 if (asoc->ep->intl_enable) {
1828 timeo = sock_sndtimeo(sk, 0);
1829 err = sctp_wait_for_connect(asoc, &timeo);
1835 wait_connect = true;
1838 pr_debug("%s: we associated primitively\n", __func__);
1841 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1842 if (IS_ERR(datamsg)) {
1843 err = PTR_ERR(datamsg);
1847 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1849 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1850 sctp_chunk_hold(chunk);
1851 sctp_set_owner_w(chunk);
1852 chunk->transport = transport;
1855 err = sctp_primitive_SEND(net, asoc, datamsg);
1857 sctp_datamsg_free(datamsg);
1861 pr_debug("%s: we sent primitively\n", __func__);
1863 sctp_datamsg_put(datamsg);
1865 if (unlikely(wait_connect)) {
1866 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1867 sctp_wait_for_connect(asoc, &timeo);
1876 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1877 const struct msghdr *msg,
1878 struct sctp_cmsgs *cmsgs)
1880 union sctp_addr *daddr = NULL;
1883 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1884 int len = msg->msg_namelen;
1886 if (len > sizeof(*daddr))
1887 len = sizeof(*daddr);
1889 daddr = (union sctp_addr *)msg->msg_name;
1891 err = sctp_verify_addr(sk, daddr, len);
1893 return ERR_PTR(err);
1899 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1900 struct sctp_sndrcvinfo *sinfo,
1901 struct sctp_cmsgs *cmsgs)
1903 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1904 sinfo->sinfo_stream = asoc->default_stream;
1905 sinfo->sinfo_ppid = asoc->default_ppid;
1906 sinfo->sinfo_context = asoc->default_context;
1907 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1910 sinfo->sinfo_flags = asoc->default_flags;
1913 if (!cmsgs->srinfo && !cmsgs->prinfo)
1914 sinfo->sinfo_timetolive = asoc->default_timetolive;
1916 if (cmsgs->authinfo) {
1917 /* Reuse sinfo_tsn to indicate that authinfo was set and
1918 * sinfo_ssn to save the keyid on tx path.
1920 sinfo->sinfo_tsn = 1;
1921 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1925 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1927 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1928 struct sctp_transport *transport = NULL;
1929 struct sctp_sndrcvinfo _sinfo, *sinfo;
1930 struct sctp_association *asoc, *tmp;
1931 struct sctp_cmsgs cmsgs;
1932 union sctp_addr *daddr;
1937 /* Parse and get snd_info */
1938 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1943 sflags = sinfo->sinfo_flags;
1945 /* Get daddr from msg */
1946 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1947 if (IS_ERR(daddr)) {
1948 err = PTR_ERR(daddr);
1954 /* SCTP_SENDALL process */
1955 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1956 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1957 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1964 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1966 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1971 iov_iter_revert(&msg->msg_iter, err);
1977 /* Get and check or create asoc */
1979 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1981 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1986 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
1991 asoc = transport->asoc;
1995 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
1998 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2004 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2009 /* Update snd_info with the asoc */
2010 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2012 /* Send msg to the asoc */
2013 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2014 if (err < 0 && err != -ESRCH && new)
2015 sctp_association_free(asoc);
2020 return sctp_error(sk, msg->msg_flags, err);
2023 /* This is an extended version of skb_pull() that removes the data from the
2024 * start of a skb even when data is spread across the list of skb's in the
2025 * frag_list. len specifies the total amount of data that needs to be removed.
2026 * when 'len' bytes could be removed from the skb, it returns 0.
2027 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2028 * could not be removed.
2030 static int sctp_skb_pull(struct sk_buff *skb, int len)
2032 struct sk_buff *list;
2033 int skb_len = skb_headlen(skb);
2036 if (len <= skb_len) {
2037 __skb_pull(skb, len);
2041 __skb_pull(skb, skb_len);
2043 skb_walk_frags(skb, list) {
2044 rlen = sctp_skb_pull(list, len);
2045 skb->len -= (len-rlen);
2046 skb->data_len -= (len-rlen);
2057 /* API 3.1.3 recvmsg() - UDP Style Syntax
2059 * ssize_t recvmsg(int socket, struct msghdr *message,
2062 * socket - the socket descriptor of the endpoint.
2063 * message - pointer to the msghdr structure which contains a single
2064 * user message and possibly some ancillary data.
2066 * See Section 5 for complete description of the data
2069 * flags - flags sent or received with the user message, see Section
2070 * 5 for complete description of the flags.
2072 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2073 int noblock, int flags, int *addr_len)
2075 struct sctp_ulpevent *event = NULL;
2076 struct sctp_sock *sp = sctp_sk(sk);
2077 struct sk_buff *skb, *head_skb;
2082 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2083 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2088 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2089 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2094 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2098 /* Get the total length of the skb including any skb's in the
2107 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2109 event = sctp_skb2event(skb);
2114 if (event->chunk && event->chunk->head_skb)
2115 head_skb = event->chunk->head_skb;
2118 sock_recv_ts_and_drops(msg, sk, head_skb);
2119 if (sctp_ulpevent_is_notification(event)) {
2120 msg->msg_flags |= MSG_NOTIFICATION;
2121 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2123 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2126 /* Check if we allow SCTP_NXTINFO. */
2127 if (sp->recvnxtinfo)
2128 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2129 /* Check if we allow SCTP_RCVINFO. */
2130 if (sp->recvrcvinfo)
2131 sctp_ulpevent_read_rcvinfo(event, msg);
2132 /* Check if we allow SCTP_SNDRCVINFO. */
2133 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2134 sctp_ulpevent_read_sndrcvinfo(event, msg);
2138 /* If skb's length exceeds the user's buffer, update the skb and
2139 * push it back to the receive_queue so that the next call to
2140 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2142 if (skb_len > copied) {
2143 msg->msg_flags &= ~MSG_EOR;
2144 if (flags & MSG_PEEK)
2146 sctp_skb_pull(skb, copied);
2147 skb_queue_head(&sk->sk_receive_queue, skb);
2149 /* When only partial message is copied to the user, increase
2150 * rwnd by that amount. If all the data in the skb is read,
2151 * rwnd is updated when the event is freed.
2153 if (!sctp_ulpevent_is_notification(event))
2154 sctp_assoc_rwnd_increase(event->asoc, copied);
2156 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2157 (event->msg_flags & MSG_EOR))
2158 msg->msg_flags |= MSG_EOR;
2160 msg->msg_flags &= ~MSG_EOR;
2163 if (flags & MSG_PEEK) {
2164 /* Release the skb reference acquired after peeking the skb in
2165 * sctp_skb_recv_datagram().
2169 /* Free the event which includes releasing the reference to
2170 * the owner of the skb, freeing the skb and updating the
2173 sctp_ulpevent_free(event);
2180 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2182 * This option is a on/off flag. If enabled no SCTP message
2183 * fragmentation will be performed. Instead if a message being sent
2184 * exceeds the current PMTU size, the message will NOT be sent and
2185 * instead a error will be indicated to the user.
2187 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2188 unsigned int optlen)
2190 if (optlen < sizeof(int))
2192 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2196 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2197 unsigned int optlen)
2199 struct sctp_sock *sp = sctp_sk(sk);
2200 struct sctp_association *asoc;
2203 if (optlen > sizeof(struct sctp_event_subscribe))
2206 for (i = 0; i < optlen; i++)
2207 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2210 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2211 asoc->subscribe = sctp_sk(sk)->subscribe;
2213 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2214 * if there is no data to be sent or retransmit, the stack will
2215 * immediately send up this notification.
2217 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2218 struct sctp_ulpevent *event;
2220 asoc = sctp_id2assoc(sk, 0);
2221 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2222 event = sctp_ulpevent_make_sender_dry_event(asoc,
2223 GFP_USER | __GFP_NOWARN);
2227 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2234 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2236 * This socket option is applicable to the UDP-style socket only. When
2237 * set it will cause associations that are idle for more than the
2238 * specified number of seconds to automatically close. An association
2239 * being idle is defined an association that has NOT sent or received
2240 * user data. The special value of '0' indicates that no automatic
2241 * close of any associations should be performed. The option expects an
2242 * integer defining the number of seconds of idle time before an
2243 * association is closed.
2245 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2246 unsigned int optlen)
2248 struct sctp_sock *sp = sctp_sk(sk);
2249 struct net *net = sock_net(sk);
2251 /* Applicable to UDP-style socket only */
2252 if (sctp_style(sk, TCP))
2254 if (optlen != sizeof(int))
2257 sp->autoclose = *optval;
2258 if (sp->autoclose > net->sctp.max_autoclose)
2259 sp->autoclose = net->sctp.max_autoclose;
2264 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2266 * Applications can enable or disable heartbeats for any peer address of
2267 * an association, modify an address's heartbeat interval, force a
2268 * heartbeat to be sent immediately, and adjust the address's maximum
2269 * number of retransmissions sent before an address is considered
2270 * unreachable. The following structure is used to access and modify an
2271 * address's parameters:
2273 * struct sctp_paddrparams {
2274 * sctp_assoc_t spp_assoc_id;
2275 * struct sockaddr_storage spp_address;
2276 * uint32_t spp_hbinterval;
2277 * uint16_t spp_pathmaxrxt;
2278 * uint32_t spp_pathmtu;
2279 * uint32_t spp_sackdelay;
2280 * uint32_t spp_flags;
2281 * uint32_t spp_ipv6_flowlabel;
2285 * spp_assoc_id - (one-to-many style socket) This is filled in the
2286 * application, and identifies the association for
2288 * spp_address - This specifies which address is of interest.
2289 * spp_hbinterval - This contains the value of the heartbeat interval,
2290 * in milliseconds. If a value of zero
2291 * is present in this field then no changes are to
2292 * be made to this parameter.
2293 * spp_pathmaxrxt - This contains the maximum number of
2294 * retransmissions before this address shall be
2295 * considered unreachable. If a value of zero
2296 * is present in this field then no changes are to
2297 * be made to this parameter.
2298 * spp_pathmtu - When Path MTU discovery is disabled the value
2299 * specified here will be the "fixed" path mtu.
2300 * Note that if the spp_address field is empty
2301 * then all associations on this address will
2302 * have this fixed path mtu set upon them.
2304 * spp_sackdelay - When delayed sack is enabled, this value specifies
2305 * the number of milliseconds that sacks will be delayed
2306 * for. This value will apply to all addresses of an
2307 * association if the spp_address field is empty. Note
2308 * also, that if delayed sack is enabled and this
2309 * value is set to 0, no change is made to the last
2310 * recorded delayed sack timer value.
2312 * spp_flags - These flags are used to control various features
2313 * on an association. The flag field may contain
2314 * zero or more of the following options.
2316 * SPP_HB_ENABLE - Enable heartbeats on the
2317 * specified address. Note that if the address
2318 * field is empty all addresses for the association
2319 * have heartbeats enabled upon them.
2321 * SPP_HB_DISABLE - Disable heartbeats on the
2322 * speicifed address. Note that if the address
2323 * field is empty all addresses for the association
2324 * will have their heartbeats disabled. Note also
2325 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2326 * mutually exclusive, only one of these two should
2327 * be specified. Enabling both fields will have
2328 * undetermined results.
2330 * SPP_HB_DEMAND - Request a user initiated heartbeat
2331 * to be made immediately.
2333 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2334 * heartbeat delayis to be set to the value of 0
2337 * SPP_PMTUD_ENABLE - This field will enable PMTU
2338 * discovery upon the specified address. Note that
2339 * if the address feild is empty then all addresses
2340 * on the association are effected.
2342 * SPP_PMTUD_DISABLE - This field will disable PMTU
2343 * discovery upon the specified address. Note that
2344 * if the address feild is empty then all addresses
2345 * on the association are effected. Not also that
2346 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2347 * exclusive. Enabling both will have undetermined
2350 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2351 * on delayed sack. The time specified in spp_sackdelay
2352 * is used to specify the sack delay for this address. Note
2353 * that if spp_address is empty then all addresses will
2354 * enable delayed sack and take on the sack delay
2355 * value specified in spp_sackdelay.
2356 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2357 * off delayed sack. If the spp_address field is blank then
2358 * delayed sack is disabled for the entire association. Note
2359 * also that this field is mutually exclusive to
2360 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2363 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2364 * setting of the IPV6 flow label value. The value is
2365 * contained in the spp_ipv6_flowlabel field.
2366 * Upon retrieval, this flag will be set to indicate that
2367 * the spp_ipv6_flowlabel field has a valid value returned.
2368 * If a specific destination address is set (in the
2369 * spp_address field), then the value returned is that of
2370 * the address. If just an association is specified (and
2371 * no address), then the association's default flow label
2372 * is returned. If neither an association nor a destination
2373 * is specified, then the socket's default flow label is
2374 * returned. For non-IPv6 sockets, this flag will be left
2377 * SPP_DSCP: Setting this flag enables the setting of the
2378 * Differentiated Services Code Point (DSCP) value
2379 * associated with either the association or a specific
2380 * address. The value is obtained in the spp_dscp field.
2381 * Upon retrieval, this flag will be set to indicate that
2382 * the spp_dscp field has a valid value returned. If a
2383 * specific destination address is set when called (in the
2384 * spp_address field), then that specific destination
2385 * address's DSCP value is returned. If just an association
2386 * is specified, then the association's default DSCP is
2387 * returned. If neither an association nor a destination is
2388 * specified, then the socket's default DSCP is returned.
2390 * spp_ipv6_flowlabel
2391 * - This field is used in conjunction with the
2392 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2393 * The 20 least significant bits are used for the flow
2394 * label. This setting has precedence over any IPv6-layer
2397 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2398 * and contains the DSCP. The 6 most significant bits are
2399 * used for the DSCP. This setting has precedence over any
2400 * IPv4- or IPv6- layer setting.
2402 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2403 struct sctp_transport *trans,
2404 struct sctp_association *asoc,
2405 struct sctp_sock *sp,
2408 int sackdelay_change)
2412 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2413 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2414 trans->asoc, trans);
2419 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2420 * this field is ignored. Note also that a value of zero indicates
2421 * the current setting should be left unchanged.
2423 if (params->spp_flags & SPP_HB_ENABLE) {
2425 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2426 * set. This lets us use 0 value when this flag
2429 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2430 params->spp_hbinterval = 0;
2432 if (params->spp_hbinterval ||
2433 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2436 msecs_to_jiffies(params->spp_hbinterval);
2439 msecs_to_jiffies(params->spp_hbinterval);
2441 sp->hbinterval = params->spp_hbinterval;
2448 trans->param_flags =
2449 (trans->param_flags & ~SPP_HB) | hb_change;
2452 (asoc->param_flags & ~SPP_HB) | hb_change;
2455 (sp->param_flags & ~SPP_HB) | hb_change;
2459 /* When Path MTU discovery is disabled the value specified here will
2460 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2461 * include the flag SPP_PMTUD_DISABLE for this field to have any
2464 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2466 trans->pathmtu = params->spp_pathmtu;
2467 sctp_assoc_sync_pmtu(asoc);
2469 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2471 sp->pathmtu = params->spp_pathmtu;
2477 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2478 (params->spp_flags & SPP_PMTUD_ENABLE);
2479 trans->param_flags =
2480 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2482 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2483 sctp_assoc_sync_pmtu(asoc);
2487 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2490 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2494 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2495 * value of this field is ignored. Note also that a value of zero
2496 * indicates the current setting should be left unchanged.
2498 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2501 msecs_to_jiffies(params->spp_sackdelay);
2504 msecs_to_jiffies(params->spp_sackdelay);
2506 sp->sackdelay = params->spp_sackdelay;
2510 if (sackdelay_change) {
2512 trans->param_flags =
2513 (trans->param_flags & ~SPP_SACKDELAY) |
2517 (asoc->param_flags & ~SPP_SACKDELAY) |
2521 (sp->param_flags & ~SPP_SACKDELAY) |
2526 /* Note that a value of zero indicates the current setting should be
2529 if (params->spp_pathmaxrxt) {
2531 trans->pathmaxrxt = params->spp_pathmaxrxt;
2533 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2535 sp->pathmaxrxt = params->spp_pathmaxrxt;
2539 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2541 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2542 trans->flowlabel = params->spp_ipv6_flowlabel &
2543 SCTP_FLOWLABEL_VAL_MASK;
2544 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2547 struct sctp_transport *t;
2549 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2551 if (t->ipaddr.sa.sa_family != AF_INET6)
2553 t->flowlabel = params->spp_ipv6_flowlabel &
2554 SCTP_FLOWLABEL_VAL_MASK;
2555 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2557 asoc->flowlabel = params->spp_ipv6_flowlabel &
2558 SCTP_FLOWLABEL_VAL_MASK;
2559 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2560 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2561 sp->flowlabel = params->spp_ipv6_flowlabel &
2562 SCTP_FLOWLABEL_VAL_MASK;
2563 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2567 if (params->spp_flags & SPP_DSCP) {
2569 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2570 trans->dscp |= SCTP_DSCP_SET_MASK;
2572 struct sctp_transport *t;
2574 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2576 t->dscp = params->spp_dscp &
2578 t->dscp |= SCTP_DSCP_SET_MASK;
2580 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2581 asoc->dscp |= SCTP_DSCP_SET_MASK;
2583 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2584 sp->dscp |= SCTP_DSCP_SET_MASK;
2591 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2592 struct sctp_paddrparams *params,
2593 unsigned int optlen)
2595 struct sctp_transport *trans = NULL;
2596 struct sctp_association *asoc = NULL;
2597 struct sctp_sock *sp = sctp_sk(sk);
2599 int hb_change, pmtud_change, sackdelay_change;
2601 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2602 spp_ipv6_flowlabel), 4)) {
2603 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2605 } else if (optlen != sizeof(*params)) {
2609 /* Validate flags and value parameters. */
2610 hb_change = params->spp_flags & SPP_HB;
2611 pmtud_change = params->spp_flags & SPP_PMTUD;
2612 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2614 if (hb_change == SPP_HB ||
2615 pmtud_change == SPP_PMTUD ||
2616 sackdelay_change == SPP_SACKDELAY ||
2617 params->spp_sackdelay > 500 ||
2618 (params->spp_pathmtu &&
2619 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2622 /* If an address other than INADDR_ANY is specified, and
2623 * no transport is found, then the request is invalid.
2625 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2626 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2627 params->spp_assoc_id);
2632 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2633 * socket is a one to many style socket, and an association
2634 * was not found, then the id was invalid.
2636 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2637 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2638 sctp_style(sk, UDP))
2641 /* Heartbeat demand can only be sent on a transport or
2642 * association, but not a socket.
2644 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2647 /* Process parameters. */
2648 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2649 hb_change, pmtud_change,
2655 /* If changes are for association, also apply parameters to each
2658 if (!trans && asoc) {
2659 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2661 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2662 hb_change, pmtud_change,
2670 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2672 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2675 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2677 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2680 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2681 struct sctp_association *asoc)
2683 struct sctp_transport *trans;
2685 if (params->sack_delay) {
2686 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2688 sctp_spp_sackdelay_enable(asoc->param_flags);
2690 if (params->sack_freq == 1) {
2692 sctp_spp_sackdelay_disable(asoc->param_flags);
2693 } else if (params->sack_freq > 1) {
2694 asoc->sackfreq = params->sack_freq;
2696 sctp_spp_sackdelay_enable(asoc->param_flags);
2699 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2701 if (params->sack_delay) {
2702 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2703 trans->param_flags =
2704 sctp_spp_sackdelay_enable(trans->param_flags);
2706 if (params->sack_freq == 1) {
2707 trans->param_flags =
2708 sctp_spp_sackdelay_disable(trans->param_flags);
2709 } else if (params->sack_freq > 1) {
2710 trans->sackfreq = params->sack_freq;
2711 trans->param_flags =
2712 sctp_spp_sackdelay_enable(trans->param_flags);
2718 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2720 * This option will effect the way delayed acks are performed. This
2721 * option allows you to get or set the delayed ack time, in
2722 * milliseconds. It also allows changing the delayed ack frequency.
2723 * Changing the frequency to 1 disables the delayed sack algorithm. If
2724 * the assoc_id is 0, then this sets or gets the endpoints default
2725 * values. If the assoc_id field is non-zero, then the set or get
2726 * effects the specified association for the one to many model (the
2727 * assoc_id field is ignored by the one to one model). Note that if
2728 * sack_delay or sack_freq are 0 when setting this option, then the
2729 * current values will remain unchanged.
2731 * struct sctp_sack_info {
2732 * sctp_assoc_t sack_assoc_id;
2733 * uint32_t sack_delay;
2734 * uint32_t sack_freq;
2737 * sack_assoc_id - This parameter, indicates which association the user
2738 * is performing an action upon. Note that if this field's value is
2739 * zero then the endpoints default value is changed (effecting future
2740 * associations only).
2742 * sack_delay - This parameter contains the number of milliseconds that
2743 * the user is requesting the delayed ACK timer be set to. Note that
2744 * this value is defined in the standard to be between 200 and 500
2747 * sack_freq - This parameter contains the number of packets that must
2748 * be received before a sack is sent without waiting for the delay
2749 * timer to expire. The default value for this is 2, setting this
2750 * value to 1 will disable the delayed sack algorithm.
2752 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2753 struct sctp_sack_info *params)
2755 struct sctp_sock *sp = sctp_sk(sk);
2756 struct sctp_association *asoc;
2758 /* Validate value parameter. */
2759 if (params->sack_delay > 500)
2762 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2763 * socket is a one to many style socket, and an association
2764 * was not found, then the id was invalid.
2766 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2767 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2768 sctp_style(sk, UDP))
2772 sctp_apply_asoc_delayed_ack(params, asoc);
2777 if (sctp_style(sk, TCP))
2778 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2780 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2781 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2782 if (params->sack_delay) {
2783 sp->sackdelay = params->sack_delay;
2785 sctp_spp_sackdelay_enable(sp->param_flags);
2787 if (params->sack_freq == 1) {
2789 sctp_spp_sackdelay_disable(sp->param_flags);
2790 } else if (params->sack_freq > 1) {
2791 sp->sackfreq = params->sack_freq;
2793 sctp_spp_sackdelay_enable(sp->param_flags);
2797 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2798 params->sack_assoc_id == SCTP_ALL_ASSOC)
2799 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2800 sctp_apply_asoc_delayed_ack(params, asoc);
2805 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2806 struct sctp_sack_info *params,
2807 unsigned int optlen)
2809 if (optlen == sizeof(struct sctp_assoc_value)) {
2810 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2811 struct sctp_sack_info p;
2813 pr_warn_ratelimited(DEPRECATED
2815 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2816 "Use struct sctp_sack_info instead\n",
2817 current->comm, task_pid_nr(current));
2819 p.sack_assoc_id = v->assoc_id;
2820 p.sack_delay = v->assoc_value;
2821 p.sack_freq = v->assoc_value ? 0 : 1;
2822 return __sctp_setsockopt_delayed_ack(sk, &p);
2825 if (optlen != sizeof(struct sctp_sack_info))
2827 if (params->sack_delay == 0 && params->sack_freq == 0)
2829 return __sctp_setsockopt_delayed_ack(sk, params);
2832 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2834 * Applications can specify protocol parameters for the default association
2835 * initialization. The option name argument to setsockopt() and getsockopt()
2838 * Setting initialization parameters is effective only on an unconnected
2839 * socket (for UDP-style sockets only future associations are effected
2840 * by the change). With TCP-style sockets, this option is inherited by
2841 * sockets derived from a listener socket.
2843 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2844 unsigned int optlen)
2846 struct sctp_sock *sp = sctp_sk(sk);
2848 if (optlen != sizeof(struct sctp_initmsg))
2851 if (sinit->sinit_num_ostreams)
2852 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2853 if (sinit->sinit_max_instreams)
2854 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2855 if (sinit->sinit_max_attempts)
2856 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2857 if (sinit->sinit_max_init_timeo)
2858 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2864 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2866 * Applications that wish to use the sendto() system call may wish to
2867 * specify a default set of parameters that would normally be supplied
2868 * through the inclusion of ancillary data. This socket option allows
2869 * such an application to set the default sctp_sndrcvinfo structure.
2870 * The application that wishes to use this socket option simply passes
2871 * in to this call the sctp_sndrcvinfo structure defined in Section
2872 * 5.2.2) The input parameters accepted by this call include
2873 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2874 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2875 * to this call if the caller is using the UDP model.
2877 static int sctp_setsockopt_default_send_param(struct sock *sk,
2878 struct sctp_sndrcvinfo *info,
2879 unsigned int optlen)
2881 struct sctp_sock *sp = sctp_sk(sk);
2882 struct sctp_association *asoc;
2884 if (optlen != sizeof(*info))
2886 if (info->sinfo_flags &
2887 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2888 SCTP_ABORT | SCTP_EOF))
2891 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2892 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2893 sctp_style(sk, UDP))
2897 asoc->default_stream = info->sinfo_stream;
2898 asoc->default_flags = info->sinfo_flags;
2899 asoc->default_ppid = info->sinfo_ppid;
2900 asoc->default_context = info->sinfo_context;
2901 asoc->default_timetolive = info->sinfo_timetolive;
2906 if (sctp_style(sk, TCP))
2907 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2909 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2910 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2911 sp->default_stream = info->sinfo_stream;
2912 sp->default_flags = info->sinfo_flags;
2913 sp->default_ppid = info->sinfo_ppid;
2914 sp->default_context = info->sinfo_context;
2915 sp->default_timetolive = info->sinfo_timetolive;
2918 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2919 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2920 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2921 asoc->default_stream = info->sinfo_stream;
2922 asoc->default_flags = info->sinfo_flags;
2923 asoc->default_ppid = info->sinfo_ppid;
2924 asoc->default_context = info->sinfo_context;
2925 asoc->default_timetolive = info->sinfo_timetolive;
2932 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2933 * (SCTP_DEFAULT_SNDINFO)
2935 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2936 struct sctp_sndinfo *info,
2937 unsigned int optlen)
2939 struct sctp_sock *sp = sctp_sk(sk);
2940 struct sctp_association *asoc;
2942 if (optlen != sizeof(*info))
2944 if (info->snd_flags &
2945 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2946 SCTP_ABORT | SCTP_EOF))
2949 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2950 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2951 sctp_style(sk, UDP))
2955 asoc->default_stream = info->snd_sid;
2956 asoc->default_flags = info->snd_flags;
2957 asoc->default_ppid = info->snd_ppid;
2958 asoc->default_context = info->snd_context;
2963 if (sctp_style(sk, TCP))
2964 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2966 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2967 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2968 sp->default_stream = info->snd_sid;
2969 sp->default_flags = info->snd_flags;
2970 sp->default_ppid = info->snd_ppid;
2971 sp->default_context = info->snd_context;
2974 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2975 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2976 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2977 asoc->default_stream = info->snd_sid;
2978 asoc->default_flags = info->snd_flags;
2979 asoc->default_ppid = info->snd_ppid;
2980 asoc->default_context = info->snd_context;
2987 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2989 * Requests that the local SCTP stack use the enclosed peer address as
2990 * the association primary. The enclosed address must be one of the
2991 * association peer's addresses.
2993 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
2994 unsigned int optlen)
2996 struct sctp_transport *trans;
3000 if (optlen != sizeof(struct sctp_prim))
3003 /* Allow security module to validate address but need address len. */
3004 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3008 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3009 (struct sockaddr *)&prim->ssp_addr,
3014 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3018 sctp_assoc_set_primary(trans->asoc, trans);
3024 * 7.1.5 SCTP_NODELAY
3026 * Turn on/off any Nagle-like algorithm. This means that packets are
3027 * generally sent as soon as possible and no unnecessary delays are
3028 * introduced, at the cost of more packets in the network. Expects an
3029 * integer boolean flag.
3031 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3032 unsigned int optlen)
3034 if (optlen < sizeof(int))
3036 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3042 * 7.1.1 SCTP_RTOINFO
3044 * The protocol parameters used to initialize and bound retransmission
3045 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3046 * and modify these parameters.
3047 * All parameters are time values, in milliseconds. A value of 0, when
3048 * modifying the parameters, indicates that the current value should not
3052 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3053 struct sctp_rtoinfo *rtoinfo,
3054 unsigned int optlen)
3056 struct sctp_association *asoc;
3057 unsigned long rto_min, rto_max;
3058 struct sctp_sock *sp = sctp_sk(sk);
3060 if (optlen != sizeof (struct sctp_rtoinfo))
3063 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3065 /* Set the values to the specific association */
3066 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3067 sctp_style(sk, UDP))
3070 rto_max = rtoinfo->srto_max;
3071 rto_min = rtoinfo->srto_min;
3074 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3076 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3079 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3081 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3083 if (rto_min > rto_max)
3087 if (rtoinfo->srto_initial != 0)
3089 msecs_to_jiffies(rtoinfo->srto_initial);
3090 asoc->rto_max = rto_max;
3091 asoc->rto_min = rto_min;
3093 /* If there is no association or the association-id = 0
3094 * set the values to the endpoint.
3096 if (rtoinfo->srto_initial != 0)
3097 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3098 sp->rtoinfo.srto_max = rto_max;
3099 sp->rtoinfo.srto_min = rto_min;
3107 * 7.1.2 SCTP_ASSOCINFO
3109 * This option is used to tune the maximum retransmission attempts
3110 * of the association.
3111 * Returns an error if the new association retransmission value is
3112 * greater than the sum of the retransmission value of the peer.
3113 * See [SCTP] for more information.
3116 static int sctp_setsockopt_associnfo(struct sock *sk,
3117 struct sctp_assocparams *assocparams,
3118 unsigned int optlen)
3121 struct sctp_association *asoc;
3123 if (optlen != sizeof(struct sctp_assocparams))
3126 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3128 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3129 sctp_style(sk, UDP))
3132 /* Set the values to the specific association */
3134 if (assocparams->sasoc_asocmaxrxt != 0) {
3137 struct sctp_transport *peer_addr;
3139 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3141 path_sum += peer_addr->pathmaxrxt;
3145 /* Only validate asocmaxrxt if we have more than
3146 * one path/transport. We do this because path
3147 * retransmissions are only counted when we have more
3151 assocparams->sasoc_asocmaxrxt > path_sum)
3154 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3157 if (assocparams->sasoc_cookie_life != 0)
3159 ms_to_ktime(assocparams->sasoc_cookie_life);
3161 /* Set the values to the endpoint */
3162 struct sctp_sock *sp = sctp_sk(sk);
3164 if (assocparams->sasoc_asocmaxrxt != 0)
3165 sp->assocparams.sasoc_asocmaxrxt =
3166 assocparams->sasoc_asocmaxrxt;
3167 if (assocparams->sasoc_cookie_life != 0)
3168 sp->assocparams.sasoc_cookie_life =
3169 assocparams->sasoc_cookie_life;
3175 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3177 * This socket option is a boolean flag which turns on or off mapped V4
3178 * addresses. If this option is turned on and the socket is type
3179 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3180 * If this option is turned off, then no mapping will be done of V4
3181 * addresses and a user will receive both PF_INET6 and PF_INET type
3182 * addresses on the socket.
3184 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3185 unsigned int optlen)
3187 struct sctp_sock *sp = sctp_sk(sk);
3189 if (optlen < sizeof(int))
3200 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3201 * This option will get or set the maximum size to put in any outgoing
3202 * SCTP DATA chunk. If a message is larger than this size it will be
3203 * fragmented by SCTP into the specified size. Note that the underlying
3204 * SCTP implementation may fragment into smaller sized chunks when the
3205 * PMTU of the underlying association is smaller than the value set by
3206 * the user. The default value for this option is '0' which indicates
3207 * the user is NOT limiting fragmentation and only the PMTU will effect
3208 * SCTP's choice of DATA chunk size. Note also that values set larger
3209 * than the maximum size of an IP datagram will effectively let SCTP
3210 * control fragmentation (i.e. the same as setting this option to 0).
3212 * The following structure is used to access and modify this parameter:
3214 * struct sctp_assoc_value {
3215 * sctp_assoc_t assoc_id;
3216 * uint32_t assoc_value;
3219 * assoc_id: This parameter is ignored for one-to-one style sockets.
3220 * For one-to-many style sockets this parameter indicates which
3221 * association the user is performing an action upon. Note that if
3222 * this field's value is zero then the endpoints default value is
3223 * changed (effecting future associations only).
3224 * assoc_value: This parameter specifies the maximum size in bytes.
3226 static int sctp_setsockopt_maxseg(struct sock *sk,
3227 struct sctp_assoc_value *params,
3228 unsigned int optlen)
3230 struct sctp_sock *sp = sctp_sk(sk);
3231 struct sctp_association *asoc;
3232 sctp_assoc_t assoc_id;
3235 if (optlen == sizeof(int)) {
3236 pr_warn_ratelimited(DEPRECATED
3238 "Use of int in maxseg socket option.\n"
3239 "Use struct sctp_assoc_value instead\n",
3240 current->comm, task_pid_nr(current));
3241 assoc_id = SCTP_FUTURE_ASSOC;
3242 val = *(int *)params;
3243 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3244 assoc_id = params->assoc_id;
3245 val = params->assoc_value;
3250 asoc = sctp_id2assoc(sk, assoc_id);
3251 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3252 sctp_style(sk, UDP))
3256 int min_len, max_len;
3257 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3258 sizeof(struct sctp_data_chunk);
3260 min_len = sctp_min_frag_point(sp, datasize);
3261 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3263 if (val < min_len || val > max_len)
3268 asoc->user_frag = val;
3269 sctp_assoc_update_frag_point(asoc);
3271 sp->user_frag = val;
3279 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3281 * Requests that the peer mark the enclosed address as the association
3282 * primary. The enclosed address must be one of the association's
3283 * locally bound addresses. The following structure is used to make a
3284 * set primary request:
3286 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3287 struct sctp_setpeerprim *prim,
3288 unsigned int optlen)
3290 struct sctp_sock *sp;
3291 struct sctp_association *asoc = NULL;
3292 struct sctp_chunk *chunk;
3298 if (!sp->ep->asconf_enable)
3301 if (optlen != sizeof(struct sctp_setpeerprim))
3304 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3308 if (!asoc->peer.asconf_capable)
3311 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3314 if (!sctp_state(asoc, ESTABLISHED))
3317 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3321 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3322 return -EADDRNOTAVAIL;
3324 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3325 return -EADDRNOTAVAIL;
3327 /* Allow security module to validate address. */
3328 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3329 (struct sockaddr *)&prim->sspp_addr,
3334 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3335 chunk = sctp_make_asconf_set_prim(asoc,
3336 (union sctp_addr *)&prim->sspp_addr);
3340 err = sctp_send_asconf(asoc, chunk);
3342 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3347 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3348 struct sctp_setadaptation *adapt,
3349 unsigned int optlen)
3351 if (optlen != sizeof(struct sctp_setadaptation))
3354 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3360 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3362 * The context field in the sctp_sndrcvinfo structure is normally only
3363 * used when a failed message is retrieved holding the value that was
3364 * sent down on the actual send call. This option allows the setting of
3365 * a default context on an association basis that will be received on
3366 * reading messages from the peer. This is especially helpful in the
3367 * one-2-many model for an application to keep some reference to an
3368 * internal state machine that is processing messages on the
3369 * association. Note that the setting of this value only effects
3370 * received messages from the peer and does not effect the value that is
3371 * saved with outbound messages.
3373 static int sctp_setsockopt_context(struct sock *sk,
3374 struct sctp_assoc_value *params,
3375 unsigned int optlen)
3377 struct sctp_sock *sp = sctp_sk(sk);
3378 struct sctp_association *asoc;
3380 if (optlen != sizeof(struct sctp_assoc_value))
3383 asoc = sctp_id2assoc(sk, params->assoc_id);
3384 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3385 sctp_style(sk, UDP))
3389 asoc->default_rcv_context = params->assoc_value;
3394 if (sctp_style(sk, TCP))
3395 params->assoc_id = SCTP_FUTURE_ASSOC;
3397 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3398 params->assoc_id == SCTP_ALL_ASSOC)
3399 sp->default_rcv_context = params->assoc_value;
3401 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3402 params->assoc_id == SCTP_ALL_ASSOC)
3403 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3404 asoc->default_rcv_context = params->assoc_value;
3410 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3412 * This options will at a minimum specify if the implementation is doing
3413 * fragmented interleave. Fragmented interleave, for a one to many
3414 * socket, is when subsequent calls to receive a message may return
3415 * parts of messages from different associations. Some implementations
3416 * may allow you to turn this value on or off. If so, when turned off,
3417 * no fragment interleave will occur (which will cause a head of line
3418 * blocking amongst multiple associations sharing the same one to many
3419 * socket). When this option is turned on, then each receive call may
3420 * come from a different association (thus the user must receive data
3421 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3422 * association each receive belongs to.
3424 * This option takes a boolean value. A non-zero value indicates that
3425 * fragmented interleave is on. A value of zero indicates that
3426 * fragmented interleave is off.
3428 * Note that it is important that an implementation that allows this
3429 * option to be turned on, have it off by default. Otherwise an unaware
3430 * application using the one to many model may become confused and act
3433 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3434 unsigned int optlen)
3436 if (optlen != sizeof(int))
3439 sctp_sk(sk)->frag_interleave = !!*val;
3441 if (!sctp_sk(sk)->frag_interleave)
3442 sctp_sk(sk)->ep->intl_enable = 0;
3448 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3449 * (SCTP_PARTIAL_DELIVERY_POINT)
3451 * This option will set or get the SCTP partial delivery point. This
3452 * point is the size of a message where the partial delivery API will be
3453 * invoked to help free up rwnd space for the peer. Setting this to a
3454 * lower value will cause partial deliveries to happen more often. The
3455 * calls argument is an integer that sets or gets the partial delivery
3456 * point. Note also that the call will fail if the user attempts to set
3457 * this value larger than the socket receive buffer size.
3459 * Note that any single message having a length smaller than or equal to
3460 * the SCTP partial delivery point will be delivered in one single read
3461 * call as long as the user provided buffer is large enough to hold the
3464 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3465 unsigned int optlen)
3467 if (optlen != sizeof(u32))
3470 /* Note: We double the receive buffer from what the user sets
3471 * it to be, also initial rwnd is based on rcvbuf/2.
3473 if (*val > (sk->sk_rcvbuf >> 1))
3476 sctp_sk(sk)->pd_point = *val;
3478 return 0; /* is this the right error code? */
3482 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3484 * This option will allow a user to change the maximum burst of packets
3485 * that can be emitted by this association. Note that the default value
3486 * is 4, and some implementations may restrict this setting so that it
3487 * can only be lowered.
3489 * NOTE: This text doesn't seem right. Do this on a socket basis with
3490 * future associations inheriting the socket value.
3492 static int sctp_setsockopt_maxburst(struct sock *sk,
3493 struct sctp_assoc_value *params,
3494 unsigned int optlen)
3496 struct sctp_sock *sp = sctp_sk(sk);
3497 struct sctp_association *asoc;
3498 sctp_assoc_t assoc_id;
3501 if (optlen == sizeof(int)) {
3502 pr_warn_ratelimited(DEPRECATED
3504 "Use of int in max_burst socket option deprecated.\n"
3505 "Use struct sctp_assoc_value instead\n",
3506 current->comm, task_pid_nr(current));
3507 assoc_id = SCTP_FUTURE_ASSOC;
3508 assoc_value = *((int *)params);
3509 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3510 assoc_id = params->assoc_id;
3511 assoc_value = params->assoc_value;
3515 asoc = sctp_id2assoc(sk, assoc_id);
3516 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3520 asoc->max_burst = assoc_value;
3525 if (sctp_style(sk, TCP))
3526 assoc_id = SCTP_FUTURE_ASSOC;
3528 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3529 sp->max_burst = assoc_value;
3531 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3532 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3533 asoc->max_burst = assoc_value;
3539 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3541 * This set option adds a chunk type that the user is requesting to be
3542 * received only in an authenticated way. Changes to the list of chunks
3543 * will only effect future associations on the socket.
3545 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3546 struct sctp_authchunk *val,
3547 unsigned int optlen)
3549 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3551 if (!ep->auth_enable)
3554 if (optlen != sizeof(struct sctp_authchunk))
3557 switch (val->sauth_chunk) {
3559 case SCTP_CID_INIT_ACK:
3560 case SCTP_CID_SHUTDOWN_COMPLETE:
3565 /* add this chunk id to the endpoint */
3566 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3570 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3572 * This option gets or sets the list of HMAC algorithms that the local
3573 * endpoint requires the peer to use.
3575 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3576 struct sctp_hmacalgo *hmacs,
3577 unsigned int optlen)
3579 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3582 if (!ep->auth_enable)
3585 if (optlen < sizeof(struct sctp_hmacalgo))
3587 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3588 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3590 idents = hmacs->shmac_num_idents;
3591 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3592 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3595 return sctp_auth_ep_set_hmacs(ep, hmacs);
3599 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3601 * This option will set a shared secret key which is used to build an
3602 * association shared key.
3604 static int sctp_setsockopt_auth_key(struct sock *sk,
3605 struct sctp_authkey *authkey,
3606 unsigned int optlen)
3608 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3609 struct sctp_association *asoc;
3612 if (optlen <= sizeof(struct sctp_authkey))
3614 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3617 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3619 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3622 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3623 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3624 sctp_style(sk, UDP))
3628 ret = sctp_auth_set_key(ep, asoc, authkey);
3632 if (sctp_style(sk, TCP))
3633 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3635 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3636 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3637 ret = sctp_auth_set_key(ep, asoc, authkey);
3644 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3645 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3646 list_for_each_entry(asoc, &ep->asocs, asocs) {
3647 int res = sctp_auth_set_key(ep, asoc, authkey);
3655 memzero_explicit(authkey, optlen);
3660 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3662 * This option will get or set the active shared key to be used to build
3663 * the association shared key.
3665 static int sctp_setsockopt_active_key(struct sock *sk,
3666 struct sctp_authkeyid *val,
3667 unsigned int optlen)
3669 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3670 struct sctp_association *asoc;
3673 if (optlen != sizeof(struct sctp_authkeyid))
3676 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3677 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3678 sctp_style(sk, UDP))
3682 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3684 if (sctp_style(sk, TCP))
3685 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3687 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3688 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3689 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3694 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3695 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3696 list_for_each_entry(asoc, &ep->asocs, asocs) {
3697 int res = sctp_auth_set_active_key(ep, asoc,
3698 val->scact_keynumber);
3709 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3711 * This set option will delete a shared secret key from use.
3713 static int sctp_setsockopt_del_key(struct sock *sk,
3714 struct sctp_authkeyid *val,
3715 unsigned int optlen)
3717 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3718 struct sctp_association *asoc;
3721 if (optlen != sizeof(struct sctp_authkeyid))
3724 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3725 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3726 sctp_style(sk, UDP))
3730 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3732 if (sctp_style(sk, TCP))
3733 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3735 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3736 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3737 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3742 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3743 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3744 list_for_each_entry(asoc, &ep->asocs, asocs) {
3745 int res = sctp_auth_del_key_id(ep, asoc,
3746 val->scact_keynumber);
3757 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3759 * This set option will deactivate a shared secret key.
3761 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3762 struct sctp_authkeyid *val,
3763 unsigned int optlen)
3765 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3766 struct sctp_association *asoc;
3769 if (optlen != sizeof(struct sctp_authkeyid))
3772 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3773 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3774 sctp_style(sk, UDP))
3778 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3780 if (sctp_style(sk, TCP))
3781 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3783 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3784 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3785 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3790 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3791 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3792 list_for_each_entry(asoc, &ep->asocs, asocs) {
3793 int res = sctp_auth_deact_key_id(ep, asoc,
3794 val->scact_keynumber);
3805 * 8.1.23 SCTP_AUTO_ASCONF
3807 * This option will enable or disable the use of the automatic generation of
3808 * ASCONF chunks to add and delete addresses to an existing association. Note
3809 * that this option has two caveats namely: a) it only affects sockets that
3810 * are bound to all addresses available to the SCTP stack, and b) the system
3811 * administrator may have an overriding control that turns the ASCONF feature
3812 * off no matter what setting the socket option may have.
3813 * This option expects an integer boolean flag, where a non-zero value turns on
3814 * the option, and a zero value turns off the option.
3815 * Note. In this implementation, socket operation overrides default parameter
3816 * being set by sysctl as well as FreeBSD implementation
3818 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3819 unsigned int optlen)
3821 struct sctp_sock *sp = sctp_sk(sk);
3823 if (optlen < sizeof(int))
3825 if (!sctp_is_ep_boundall(sk) && *val)
3827 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3830 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3831 if (*val == 0 && sp->do_auto_asconf) {
3832 list_del(&sp->auto_asconf_list);
3833 sp->do_auto_asconf = 0;
3834 } else if (*val && !sp->do_auto_asconf) {
3835 list_add_tail(&sp->auto_asconf_list,
3836 &sock_net(sk)->sctp.auto_asconf_splist);
3837 sp->do_auto_asconf = 1;
3839 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3844 * SCTP_PEER_ADDR_THLDS
3846 * This option allows us to alter the partially failed threshold for one or all
3847 * transports in an association. See Section 6.1 of:
3848 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3850 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3851 struct sctp_paddrthlds_v2 *val,
3852 unsigned int optlen, bool v2)
3854 struct sctp_transport *trans;
3855 struct sctp_association *asoc;
3858 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3862 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3865 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3866 trans = sctp_addr_id2transport(sk, &val->spt_address,
3871 if (val->spt_pathmaxrxt)
3872 trans->pathmaxrxt = val->spt_pathmaxrxt;
3874 trans->ps_retrans = val->spt_pathcpthld;
3875 trans->pf_retrans = val->spt_pathpfthld;
3880 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3881 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3882 sctp_style(sk, UDP))
3886 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3888 if (val->spt_pathmaxrxt)
3889 trans->pathmaxrxt = val->spt_pathmaxrxt;
3891 trans->ps_retrans = val->spt_pathcpthld;
3892 trans->pf_retrans = val->spt_pathpfthld;
3895 if (val->spt_pathmaxrxt)
3896 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3898 asoc->ps_retrans = val->spt_pathcpthld;
3899 asoc->pf_retrans = val->spt_pathpfthld;
3901 struct sctp_sock *sp = sctp_sk(sk);
3903 if (val->spt_pathmaxrxt)
3904 sp->pathmaxrxt = val->spt_pathmaxrxt;
3906 sp->ps_retrans = val->spt_pathcpthld;
3907 sp->pf_retrans = val->spt_pathpfthld;
3913 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3914 unsigned int optlen)
3916 if (optlen < sizeof(int))
3919 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3924 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3925 unsigned int optlen)
3927 if (optlen < sizeof(int))
3930 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3935 static int sctp_setsockopt_pr_supported(struct sock *sk,
3936 struct sctp_assoc_value *params,
3937 unsigned int optlen)
3939 struct sctp_association *asoc;
3941 if (optlen != sizeof(*params))
3944 asoc = sctp_id2assoc(sk, params->assoc_id);
3945 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3946 sctp_style(sk, UDP))
3949 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3954 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3955 struct sctp_default_prinfo *info,
3956 unsigned int optlen)
3958 struct sctp_sock *sp = sctp_sk(sk);
3959 struct sctp_association *asoc;
3960 int retval = -EINVAL;
3962 if (optlen != sizeof(*info))
3965 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3968 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3971 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3972 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3973 sctp_style(sk, UDP))
3979 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3980 asoc->default_timetolive = info->pr_value;
3984 if (sctp_style(sk, TCP))
3985 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
3987 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
3988 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3989 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
3990 sp->default_timetolive = info->pr_value;
3993 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
3994 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3995 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3996 SCTP_PR_SET_POLICY(asoc->default_flags,
3998 asoc->default_timetolive = info->pr_value;
4006 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4007 struct sctp_assoc_value *params,
4008 unsigned int optlen)
4010 struct sctp_association *asoc;
4011 int retval = -EINVAL;
4013 if (optlen != sizeof(*params))
4016 asoc = sctp_id2assoc(sk, params->assoc_id);
4017 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4018 sctp_style(sk, UDP))
4021 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4029 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4030 struct sctp_assoc_value *params,
4031 unsigned int optlen)
4033 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4034 struct sctp_association *asoc;
4035 int retval = -EINVAL;
4037 if (optlen != sizeof(*params))
4040 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4043 asoc = sctp_id2assoc(sk, params->assoc_id);
4044 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4045 sctp_style(sk, UDP))
4051 asoc->strreset_enable = params->assoc_value;
4055 if (sctp_style(sk, TCP))
4056 params->assoc_id = SCTP_FUTURE_ASSOC;
4058 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4059 params->assoc_id == SCTP_ALL_ASSOC)
4060 ep->strreset_enable = params->assoc_value;
4062 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4063 params->assoc_id == SCTP_ALL_ASSOC)
4064 list_for_each_entry(asoc, &ep->asocs, asocs)
4065 asoc->strreset_enable = params->assoc_value;
4071 static int sctp_setsockopt_reset_streams(struct sock *sk,
4072 struct sctp_reset_streams *params,
4073 unsigned int optlen)
4075 struct sctp_association *asoc;
4077 if (optlen < sizeof(*params))
4079 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4080 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4081 sizeof(__u16) * sizeof(*params));
4083 if (params->srs_number_streams * sizeof(__u16) >
4084 optlen - sizeof(*params))
4087 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4091 return sctp_send_reset_streams(asoc, params);
4094 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4095 unsigned int optlen)
4097 struct sctp_association *asoc;
4099 if (optlen != sizeof(*associd))
4102 asoc = sctp_id2assoc(sk, *associd);
4106 return sctp_send_reset_assoc(asoc);
4109 static int sctp_setsockopt_add_streams(struct sock *sk,
4110 struct sctp_add_streams *params,
4111 unsigned int optlen)
4113 struct sctp_association *asoc;
4115 if (optlen != sizeof(*params))
4118 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4122 return sctp_send_add_streams(asoc, params);
4125 static int sctp_setsockopt_scheduler(struct sock *sk,
4126 struct sctp_assoc_value *params,
4127 unsigned int optlen)
4129 struct sctp_sock *sp = sctp_sk(sk);
4130 struct sctp_association *asoc;
4133 if (optlen < sizeof(*params))
4136 if (params->assoc_value > SCTP_SS_MAX)
4139 asoc = sctp_id2assoc(sk, params->assoc_id);
4140 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4141 sctp_style(sk, UDP))
4145 return sctp_sched_set_sched(asoc, params->assoc_value);
4147 if (sctp_style(sk, TCP))
4148 params->assoc_id = SCTP_FUTURE_ASSOC;
4150 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4151 params->assoc_id == SCTP_ALL_ASSOC)
4152 sp->default_ss = params->assoc_value;
4154 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4155 params->assoc_id == SCTP_ALL_ASSOC) {
4156 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4157 int ret = sctp_sched_set_sched(asoc,
4158 params->assoc_value);
4168 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4169 struct sctp_stream_value *params,
4170 unsigned int optlen)
4172 struct sctp_association *asoc;
4173 int retval = -EINVAL;
4175 if (optlen < sizeof(*params))
4178 asoc = sctp_id2assoc(sk, params->assoc_id);
4179 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4180 sctp_style(sk, UDP))
4184 retval = sctp_sched_set_value(asoc, params->stream_id,
4185 params->stream_value, GFP_KERNEL);
4191 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4192 int ret = sctp_sched_set_value(asoc, params->stream_id,
4193 params->stream_value,
4195 if (ret && !retval) /* try to return the 1st error. */
4203 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4204 struct sctp_assoc_value *p,
4205 unsigned int optlen)
4207 struct sctp_sock *sp = sctp_sk(sk);
4208 struct sctp_association *asoc;
4210 if (optlen < sizeof(*p))
4213 asoc = sctp_id2assoc(sk, p->assoc_id);
4214 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4217 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4221 sp->ep->intl_enable = !!p->assoc_value;
4225 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4226 unsigned int optlen)
4228 if (!sctp_style(sk, TCP))
4231 if (sctp_sk(sk)->ep->base.bind_addr.port)
4234 if (optlen < sizeof(int))
4237 sctp_sk(sk)->reuse = !!*val;
4242 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4243 struct sctp_association *asoc)
4245 struct sctp_ulpevent *event;
4247 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4249 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4250 if (sctp_outq_is_empty(&asoc->outqueue)) {
4251 event = sctp_ulpevent_make_sender_dry_event(asoc,
4252 GFP_USER | __GFP_NOWARN);
4256 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4263 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4264 unsigned int optlen)
4266 struct sctp_sock *sp = sctp_sk(sk);
4267 struct sctp_association *asoc;
4270 if (optlen < sizeof(*param))
4273 if (param->se_type < SCTP_SN_TYPE_BASE ||
4274 param->se_type > SCTP_SN_TYPE_MAX)
4277 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4278 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4279 sctp_style(sk, UDP))
4283 return sctp_assoc_ulpevent_type_set(param, asoc);
4285 if (sctp_style(sk, TCP))
4286 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4288 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4289 param->se_assoc_id == SCTP_ALL_ASSOC)
4290 sctp_ulpevent_type_set(&sp->subscribe,
4291 param->se_type, param->se_on);
4293 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4294 param->se_assoc_id == SCTP_ALL_ASSOC) {
4295 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4296 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4306 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4307 struct sctp_assoc_value *params,
4308 unsigned int optlen)
4310 struct sctp_association *asoc;
4311 struct sctp_endpoint *ep;
4312 int retval = -EINVAL;
4314 if (optlen != sizeof(*params))
4317 asoc = sctp_id2assoc(sk, params->assoc_id);
4318 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4319 sctp_style(sk, UDP))
4322 ep = sctp_sk(sk)->ep;
4323 ep->asconf_enable = !!params->assoc_value;
4325 if (ep->asconf_enable && ep->auth_enable) {
4326 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4327 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4336 static int sctp_setsockopt_auth_supported(struct sock *sk,
4337 struct sctp_assoc_value *params,
4338 unsigned int optlen)
4340 struct sctp_association *asoc;
4341 struct sctp_endpoint *ep;
4342 int retval = -EINVAL;
4344 if (optlen != sizeof(*params))
4347 asoc = sctp_id2assoc(sk, params->assoc_id);
4348 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4349 sctp_style(sk, UDP))
4352 ep = sctp_sk(sk)->ep;
4353 if (params->assoc_value) {
4354 retval = sctp_auth_init(ep, GFP_KERNEL);
4357 if (ep->asconf_enable) {
4358 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4359 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4363 ep->auth_enable = !!params->assoc_value;
4370 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4371 struct sctp_assoc_value *params,
4372 unsigned int optlen)
4374 struct sctp_association *asoc;
4375 int retval = -EINVAL;
4377 if (optlen != sizeof(*params))
4380 asoc = sctp_id2assoc(sk, params->assoc_id);
4381 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4382 sctp_style(sk, UDP))
4385 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4392 static int sctp_setsockopt_pf_expose(struct sock *sk,
4393 struct sctp_assoc_value *params,
4394 unsigned int optlen)
4396 struct sctp_association *asoc;
4397 int retval = -EINVAL;
4399 if (optlen != sizeof(*params))
4402 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4405 asoc = sctp_id2assoc(sk, params->assoc_id);
4406 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4407 sctp_style(sk, UDP))
4411 asoc->pf_expose = params->assoc_value;
4413 sctp_sk(sk)->pf_expose = params->assoc_value;
4420 /* API 6.2 setsockopt(), getsockopt()
4422 * Applications use setsockopt() and getsockopt() to set or retrieve
4423 * socket options. Socket options are used to change the default
4424 * behavior of sockets calls. They are described in Section 7.
4428 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4429 * int __user *optlen);
4430 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4433 * sd - the socket descript.
4434 * level - set to IPPROTO_SCTP for all SCTP options.
4435 * optname - the option name.
4436 * optval - the buffer to store the value of the option.
4437 * optlen - the size of the buffer.
4439 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4440 sockptr_t optval, unsigned int optlen)
4445 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4447 /* I can hardly begin to describe how wrong this is. This is
4448 * so broken as to be worse than useless. The API draft
4449 * REALLY is NOT helpful here... I am not convinced that the
4450 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4451 * are at all well-founded.
4453 if (level != SOL_SCTP) {
4454 struct sctp_af *af = sctp_sk(sk)->pf->af;
4456 return af->setsockopt(sk, level, optname, optval, optlen);
4460 kopt = memdup_sockptr(optval, optlen);
4462 return PTR_ERR(kopt);
4468 case SCTP_SOCKOPT_BINDX_ADD:
4469 /* 'optlen' is the size of the addresses buffer. */
4470 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4471 SCTP_BINDX_ADD_ADDR);
4474 case SCTP_SOCKOPT_BINDX_REM:
4475 /* 'optlen' is the size of the addresses buffer. */
4476 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4477 SCTP_BINDX_REM_ADDR);
4480 case SCTP_SOCKOPT_CONNECTX_OLD:
4481 /* 'optlen' is the size of the addresses buffer. */
4482 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4485 case SCTP_SOCKOPT_CONNECTX:
4486 /* 'optlen' is the size of the addresses buffer. */
4487 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4490 case SCTP_DISABLE_FRAGMENTS:
4491 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4495 retval = sctp_setsockopt_events(sk, kopt, optlen);
4498 case SCTP_AUTOCLOSE:
4499 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4502 case SCTP_PEER_ADDR_PARAMS:
4503 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4506 case SCTP_DELAYED_SACK:
4507 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4509 case SCTP_PARTIAL_DELIVERY_POINT:
4510 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4514 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4516 case SCTP_DEFAULT_SEND_PARAM:
4517 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4519 case SCTP_DEFAULT_SNDINFO:
4520 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4522 case SCTP_PRIMARY_ADDR:
4523 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4525 case SCTP_SET_PEER_PRIMARY_ADDR:
4526 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4529 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4532 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4534 case SCTP_ASSOCINFO:
4535 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4537 case SCTP_I_WANT_MAPPED_V4_ADDR:
4538 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4541 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4543 case SCTP_ADAPTATION_LAYER:
4544 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4547 retval = sctp_setsockopt_context(sk, kopt, optlen);
4549 case SCTP_FRAGMENT_INTERLEAVE:
4550 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4552 case SCTP_MAX_BURST:
4553 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4555 case SCTP_AUTH_CHUNK:
4556 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4558 case SCTP_HMAC_IDENT:
4559 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4562 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4564 case SCTP_AUTH_ACTIVE_KEY:
4565 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4567 case SCTP_AUTH_DELETE_KEY:
4568 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4570 case SCTP_AUTH_DEACTIVATE_KEY:
4571 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4573 case SCTP_AUTO_ASCONF:
4574 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4576 case SCTP_PEER_ADDR_THLDS:
4577 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4580 case SCTP_PEER_ADDR_THLDS_V2:
4581 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4584 case SCTP_RECVRCVINFO:
4585 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4587 case SCTP_RECVNXTINFO:
4588 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4590 case SCTP_PR_SUPPORTED:
4591 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4593 case SCTP_DEFAULT_PRINFO:
4594 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4596 case SCTP_RECONFIG_SUPPORTED:
4597 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4599 case SCTP_ENABLE_STREAM_RESET:
4600 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4602 case SCTP_RESET_STREAMS:
4603 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4605 case SCTP_RESET_ASSOC:
4606 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4608 case SCTP_ADD_STREAMS:
4609 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4611 case SCTP_STREAM_SCHEDULER:
4612 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4614 case SCTP_STREAM_SCHEDULER_VALUE:
4615 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4617 case SCTP_INTERLEAVING_SUPPORTED:
4618 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4621 case SCTP_REUSE_PORT:
4622 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4625 retval = sctp_setsockopt_event(sk, kopt, optlen);
4627 case SCTP_ASCONF_SUPPORTED:
4628 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4630 case SCTP_AUTH_SUPPORTED:
4631 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4633 case SCTP_ECN_SUPPORTED:
4634 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4636 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4637 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4640 retval = -ENOPROTOOPT;
4649 /* API 3.1.6 connect() - UDP Style Syntax
4651 * An application may use the connect() call in the UDP model to initiate an
4652 * association without sending data.
4656 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4658 * sd: the socket descriptor to have a new association added to.
4660 * nam: the address structure (either struct sockaddr_in or struct
4661 * sockaddr_in6 defined in RFC2553 [7]).
4663 * len: the size of the address.
4665 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4666 int addr_len, int flags)
4672 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4675 /* Validate addr_len before calling common connect/connectx routine. */
4676 af = sctp_get_af_specific(addr->sa_family);
4677 if (af && addr_len >= af->sockaddr_len)
4678 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4684 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4685 int addr_len, int flags)
4687 if (addr_len < sizeof(uaddr->sa_family))
4690 if (uaddr->sa_family == AF_UNSPEC)
4693 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4696 /* FIXME: Write comments. */
4697 static int sctp_disconnect(struct sock *sk, int flags)
4699 return -EOPNOTSUPP; /* STUB */
4702 /* 4.1.4 accept() - TCP Style Syntax
4704 * Applications use accept() call to remove an established SCTP
4705 * association from the accept queue of the endpoint. A new socket
4706 * descriptor will be returned from accept() to represent the newly
4707 * formed association.
4709 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4711 struct sctp_sock *sp;
4712 struct sctp_endpoint *ep;
4713 struct sock *newsk = NULL;
4714 struct sctp_association *asoc;
4723 if (!sctp_style(sk, TCP)) {
4724 error = -EOPNOTSUPP;
4728 if (!sctp_sstate(sk, LISTENING)) {
4733 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4735 error = sctp_wait_for_accept(sk, timeo);
4739 /* We treat the list of associations on the endpoint as the accept
4740 * queue and pick the first association on the list.
4742 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4744 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4750 /* Populate the fields of the newsk from the oldsk and migrate the
4751 * asoc to the newsk.
4753 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4755 sk_common_release(newsk);
4765 /* The SCTP ioctl handler. */
4766 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4773 * SEQPACKET-style sockets in LISTENING state are valid, for
4774 * SCTP, so only discard TCP-style sockets in LISTENING state.
4776 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4781 struct sk_buff *skb;
4782 unsigned int amount = 0;
4784 skb = skb_peek(&sk->sk_receive_queue);
4787 * We will only return the amount of this packet since
4788 * that is all that will be read.
4792 rc = put_user(amount, (int __user *)arg);
4804 /* This is the function which gets called during socket creation to
4805 * initialized the SCTP-specific portion of the sock.
4806 * The sock structure should already be zero-filled memory.
4808 static int sctp_init_sock(struct sock *sk)
4810 struct net *net = sock_net(sk);
4811 struct sctp_sock *sp;
4813 pr_debug("%s: sk:%p\n", __func__, sk);
4817 /* Initialize the SCTP per socket area. */
4818 switch (sk->sk_type) {
4819 case SOCK_SEQPACKET:
4820 sp->type = SCTP_SOCKET_UDP;
4823 sp->type = SCTP_SOCKET_TCP;
4826 return -ESOCKTNOSUPPORT;
4829 sk->sk_gso_type = SKB_GSO_SCTP;
4831 /* Initialize default send parameters. These parameters can be
4832 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4834 sp->default_stream = 0;
4835 sp->default_ppid = 0;
4836 sp->default_flags = 0;
4837 sp->default_context = 0;
4838 sp->default_timetolive = 0;
4840 sp->default_rcv_context = 0;
4841 sp->max_burst = net->sctp.max_burst;
4843 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4845 /* Initialize default setup parameters. These parameters
4846 * can be modified with the SCTP_INITMSG socket option or
4847 * overridden by the SCTP_INIT CMSG.
4849 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4850 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4851 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4852 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4854 /* Initialize default RTO related parameters. These parameters can
4855 * be modified for with the SCTP_RTOINFO socket option.
4857 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4858 sp->rtoinfo.srto_max = net->sctp.rto_max;
4859 sp->rtoinfo.srto_min = net->sctp.rto_min;
4861 /* Initialize default association related parameters. These parameters
4862 * can be modified with the SCTP_ASSOCINFO socket option.
4864 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4865 sp->assocparams.sasoc_number_peer_destinations = 0;
4866 sp->assocparams.sasoc_peer_rwnd = 0;
4867 sp->assocparams.sasoc_local_rwnd = 0;
4868 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4870 /* Initialize default event subscriptions. By default, all the
4875 /* Default Peer Address Parameters. These defaults can
4876 * be modified via SCTP_PEER_ADDR_PARAMS
4878 sp->hbinterval = net->sctp.hb_interval;
4879 sp->pathmaxrxt = net->sctp.max_retrans_path;
4880 sp->pf_retrans = net->sctp.pf_retrans;
4881 sp->ps_retrans = net->sctp.ps_retrans;
4882 sp->pf_expose = net->sctp.pf_expose;
4883 sp->pathmtu = 0; /* allow default discovery */
4884 sp->sackdelay = net->sctp.sack_timeout;
4886 sp->param_flags = SPP_HB_ENABLE |
4888 SPP_SACKDELAY_ENABLE;
4889 sp->default_ss = SCTP_SS_DEFAULT;
4891 /* If enabled no SCTP message fragmentation will be performed.
4892 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4894 sp->disable_fragments = 0;
4896 /* Enable Nagle algorithm by default. */
4899 sp->recvrcvinfo = 0;
4900 sp->recvnxtinfo = 0;
4902 /* Enable by default. */
4905 /* Auto-close idle associations after the configured
4906 * number of seconds. A value of 0 disables this
4907 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4908 * for UDP-style sockets only.
4912 /* User specified fragmentation limit. */
4915 sp->adaptation_ind = 0;
4917 sp->pf = sctp_get_pf_specific(sk->sk_family);
4919 /* Control variables for partial data delivery. */
4920 atomic_set(&sp->pd_mode, 0);
4921 skb_queue_head_init(&sp->pd_lobby);
4922 sp->frag_interleave = 0;
4924 /* Create a per socket endpoint structure. Even if we
4925 * change the data structure relationships, this may still
4926 * be useful for storing pre-connect address information.
4928 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4934 sk->sk_destruct = sctp_destruct_sock;
4936 SCTP_DBG_OBJCNT_INC(sock);
4939 sk_sockets_allocated_inc(sk);
4940 sock_prot_inuse_add(net, sk->sk_prot, 1);
4942 /* Nothing can fail after this block, otherwise
4943 * sctp_destroy_sock() will be called without addr_wq_lock held
4945 if (net->sctp.default_auto_asconf) {
4946 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4947 list_add_tail(&sp->auto_asconf_list,
4948 &net->sctp.auto_asconf_splist);
4949 sp->do_auto_asconf = 1;
4950 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4952 sp->do_auto_asconf = 0;
4960 /* Cleanup any SCTP per socket resources. Must be called with
4961 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4963 static void sctp_destroy_sock(struct sock *sk)
4965 struct sctp_sock *sp;
4967 pr_debug("%s: sk:%p\n", __func__, sk);
4969 /* Release our hold on the endpoint. */
4971 /* This could happen during socket init, thus we bail out
4972 * early, since the rest of the below is not setup either.
4977 if (sp->do_auto_asconf) {
4978 sp->do_auto_asconf = 0;
4979 list_del(&sp->auto_asconf_list);
4981 sctp_endpoint_free(sp->ep);
4983 sk_sockets_allocated_dec(sk);
4984 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4988 /* Triggered when there are no references on the socket anymore */
4989 static void sctp_destruct_sock(struct sock *sk)
4991 struct sctp_sock *sp = sctp_sk(sk);
4993 /* Free up the HMAC transform. */
4994 crypto_free_shash(sp->hmac);
4996 inet_sock_destruct(sk);
4999 /* API 4.1.7 shutdown() - TCP Style Syntax
5000 * int shutdown(int socket, int how);
5002 * sd - the socket descriptor of the association to be closed.
5003 * how - Specifies the type of shutdown. The values are
5006 * Disables further receive operations. No SCTP
5007 * protocol action is taken.
5009 * Disables further send operations, and initiates
5010 * the SCTP shutdown sequence.
5012 * Disables further send and receive operations
5013 * and initiates the SCTP shutdown sequence.
5015 static void sctp_shutdown(struct sock *sk, int how)
5017 struct net *net = sock_net(sk);
5018 struct sctp_endpoint *ep;
5020 if (!sctp_style(sk, TCP))
5023 ep = sctp_sk(sk)->ep;
5024 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5025 struct sctp_association *asoc;
5027 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5028 asoc = list_entry(ep->asocs.next,
5029 struct sctp_association, asocs);
5030 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5034 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5035 struct sctp_info *info)
5037 struct sctp_transport *prim;
5038 struct list_head *pos;
5041 memset(info, 0, sizeof(*info));
5043 struct sctp_sock *sp = sctp_sk(sk);
5045 info->sctpi_s_autoclose = sp->autoclose;
5046 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5047 info->sctpi_s_pd_point = sp->pd_point;
5048 info->sctpi_s_nodelay = sp->nodelay;
5049 info->sctpi_s_disable_fragments = sp->disable_fragments;
5050 info->sctpi_s_v4mapped = sp->v4mapped;
5051 info->sctpi_s_frag_interleave = sp->frag_interleave;
5052 info->sctpi_s_type = sp->type;
5057 info->sctpi_tag = asoc->c.my_vtag;
5058 info->sctpi_state = asoc->state;
5059 info->sctpi_rwnd = asoc->a_rwnd;
5060 info->sctpi_unackdata = asoc->unack_data;
5061 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5062 info->sctpi_instrms = asoc->stream.incnt;
5063 info->sctpi_outstrms = asoc->stream.outcnt;
5064 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5065 info->sctpi_inqueue++;
5066 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5067 info->sctpi_outqueue++;
5068 info->sctpi_overall_error = asoc->overall_error_count;
5069 info->sctpi_max_burst = asoc->max_burst;
5070 info->sctpi_maxseg = asoc->frag_point;
5071 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5072 info->sctpi_peer_tag = asoc->c.peer_vtag;
5074 mask = asoc->peer.ecn_capable << 1;
5075 mask = (mask | asoc->peer.ipv4_address) << 1;
5076 mask = (mask | asoc->peer.ipv6_address) << 1;
5077 mask = (mask | asoc->peer.hostname_address) << 1;
5078 mask = (mask | asoc->peer.asconf_capable) << 1;
5079 mask = (mask | asoc->peer.prsctp_capable) << 1;
5080 mask = (mask | asoc->peer.auth_capable);
5081 info->sctpi_peer_capable = mask;
5082 mask = asoc->peer.sack_needed << 1;
5083 mask = (mask | asoc->peer.sack_generation) << 1;
5084 mask = (mask | asoc->peer.zero_window_announced);
5085 info->sctpi_peer_sack = mask;
5087 info->sctpi_isacks = asoc->stats.isacks;
5088 info->sctpi_osacks = asoc->stats.osacks;
5089 info->sctpi_opackets = asoc->stats.opackets;
5090 info->sctpi_ipackets = asoc->stats.ipackets;
5091 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5092 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5093 info->sctpi_idupchunks = asoc->stats.idupchunks;
5094 info->sctpi_gapcnt = asoc->stats.gapcnt;
5095 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5096 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5097 info->sctpi_oodchunks = asoc->stats.oodchunks;
5098 info->sctpi_iodchunks = asoc->stats.iodchunks;
5099 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5100 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5102 prim = asoc->peer.primary_path;
5103 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5104 info->sctpi_p_state = prim->state;
5105 info->sctpi_p_cwnd = prim->cwnd;
5106 info->sctpi_p_srtt = prim->srtt;
5107 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5108 info->sctpi_p_hbinterval = prim->hbinterval;
5109 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5110 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5111 info->sctpi_p_ssthresh = prim->ssthresh;
5112 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5113 info->sctpi_p_flight_size = prim->flight_size;
5114 info->sctpi_p_error = prim->error_count;
5118 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5120 /* use callback to avoid exporting the core structure */
5121 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5123 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5125 rhashtable_walk_start(iter);
5128 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5130 rhashtable_walk_stop(iter);
5131 rhashtable_walk_exit(iter);
5134 struct sctp_transport *sctp_transport_get_next(struct net *net,
5135 struct rhashtable_iter *iter)
5137 struct sctp_transport *t;
5139 t = rhashtable_walk_next(iter);
5140 for (; t; t = rhashtable_walk_next(iter)) {
5142 if (PTR_ERR(t) == -EAGAIN)
5147 if (!sctp_transport_hold(t))
5150 if (net_eq(t->asoc->base.net, net) &&
5151 t->asoc->peer.primary_path == t)
5154 sctp_transport_put(t);
5160 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5161 struct rhashtable_iter *iter,
5164 struct sctp_transport *t;
5167 return SEQ_START_TOKEN;
5169 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5172 sctp_transport_put(t);
5178 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5182 struct sctp_ep_common *epb;
5183 struct sctp_hashbucket *head;
5185 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5187 read_lock_bh(&head->lock);
5188 sctp_for_each_hentry(epb, &head->chain) {
5189 err = cb(sctp_ep(epb), p);
5193 read_unlock_bh(&head->lock);
5198 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5200 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5202 const union sctp_addr *laddr,
5203 const union sctp_addr *paddr, void *p)
5205 struct sctp_transport *transport;
5209 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5214 err = cb(transport, p);
5215 sctp_transport_put(transport);
5219 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5221 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5222 int (*cb_done)(struct sctp_transport *, void *),
5223 struct net *net, int *pos, void *p) {
5224 struct rhashtable_iter hti;
5225 struct sctp_transport *tsp;
5230 sctp_transport_walk_start(&hti);
5232 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5233 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5238 sctp_transport_put(tsp);
5240 sctp_transport_walk_stop(&hti);
5243 if (cb_done && !cb_done(tsp, p)) {
5245 sctp_transport_put(tsp);
5248 sctp_transport_put(tsp);
5253 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5255 /* 7.2.1 Association Status (SCTP_STATUS)
5257 * Applications can retrieve current status information about an
5258 * association, including association state, peer receiver window size,
5259 * number of unacked data chunks, and number of data chunks pending
5260 * receipt. This information is read-only.
5262 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5263 char __user *optval,
5266 struct sctp_status status;
5267 struct sctp_association *asoc = NULL;
5268 struct sctp_transport *transport;
5269 sctp_assoc_t associd;
5272 if (len < sizeof(status)) {
5277 len = sizeof(status);
5278 if (copy_from_user(&status, optval, len)) {
5283 associd = status.sstat_assoc_id;
5284 asoc = sctp_id2assoc(sk, associd);
5290 transport = asoc->peer.primary_path;
5292 status.sstat_assoc_id = sctp_assoc2id(asoc);
5293 status.sstat_state = sctp_assoc_to_state(asoc);
5294 status.sstat_rwnd = asoc->peer.rwnd;
5295 status.sstat_unackdata = asoc->unack_data;
5297 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5298 status.sstat_instrms = asoc->stream.incnt;
5299 status.sstat_outstrms = asoc->stream.outcnt;
5300 status.sstat_fragmentation_point = asoc->frag_point;
5301 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5302 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5303 transport->af_specific->sockaddr_len);
5304 /* Map ipv4 address into v4-mapped-on-v6 address. */
5305 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5306 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5307 status.sstat_primary.spinfo_state = transport->state;
5308 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5309 status.sstat_primary.spinfo_srtt = transport->srtt;
5310 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5311 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5313 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5314 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5316 if (put_user(len, optlen)) {
5321 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5322 __func__, len, status.sstat_state, status.sstat_rwnd,
5323 status.sstat_assoc_id);
5325 if (copy_to_user(optval, &status, len)) {
5335 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5337 * Applications can retrieve information about a specific peer address
5338 * of an association, including its reachability state, congestion
5339 * window, and retransmission timer values. This information is
5342 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5343 char __user *optval,
5346 struct sctp_paddrinfo pinfo;
5347 struct sctp_transport *transport;
5350 if (len < sizeof(pinfo)) {
5355 len = sizeof(pinfo);
5356 if (copy_from_user(&pinfo, optval, len)) {
5361 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5362 pinfo.spinfo_assoc_id);
5368 if (transport->state == SCTP_PF &&
5369 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5374 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5375 pinfo.spinfo_state = transport->state;
5376 pinfo.spinfo_cwnd = transport->cwnd;
5377 pinfo.spinfo_srtt = transport->srtt;
5378 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5379 pinfo.spinfo_mtu = transport->pathmtu;
5381 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5382 pinfo.spinfo_state = SCTP_ACTIVE;
5384 if (put_user(len, optlen)) {
5389 if (copy_to_user(optval, &pinfo, len)) {
5398 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5400 * This option is a on/off flag. If enabled no SCTP message
5401 * fragmentation will be performed. Instead if a message being sent
5402 * exceeds the current PMTU size, the message will NOT be sent and
5403 * instead a error will be indicated to the user.
5405 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5406 char __user *optval, int __user *optlen)
5410 if (len < sizeof(int))
5414 val = (sctp_sk(sk)->disable_fragments == 1);
5415 if (put_user(len, optlen))
5417 if (copy_to_user(optval, &val, len))
5422 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5424 * This socket option is used to specify various notifications and
5425 * ancillary data the user wishes to receive.
5427 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5430 struct sctp_event_subscribe subscribe;
5431 __u8 *sn_type = (__u8 *)&subscribe;
5436 if (len > sizeof(struct sctp_event_subscribe))
5437 len = sizeof(struct sctp_event_subscribe);
5438 if (put_user(len, optlen))
5441 for (i = 0; i < len; i++)
5442 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5443 SCTP_SN_TYPE_BASE + i);
5445 if (copy_to_user(optval, &subscribe, len))
5451 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5453 * This socket option is applicable to the UDP-style socket only. When
5454 * set it will cause associations that are idle for more than the
5455 * specified number of seconds to automatically close. An association
5456 * being idle is defined an association that has NOT sent or received
5457 * user data. The special value of '0' indicates that no automatic
5458 * close of any associations should be performed. The option expects an
5459 * integer defining the number of seconds of idle time before an
5460 * association is closed.
5462 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5464 /* Applicable to UDP-style socket only */
5465 if (sctp_style(sk, TCP))
5467 if (len < sizeof(int))
5470 if (put_user(len, optlen))
5472 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5477 /* Helper routine to branch off an association to a new socket. */
5478 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5480 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5481 struct sctp_sock *sp = sctp_sk(sk);
5482 struct socket *sock;
5485 /* Do not peel off from one netns to another one. */
5486 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5492 /* An association cannot be branched off from an already peeled-off
5493 * socket, nor is this supported for tcp style sockets.
5495 if (!sctp_style(sk, UDP))
5498 /* Create a new socket. */
5499 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5503 sctp_copy_sock(sock->sk, sk, asoc);
5505 /* Make peeled-off sockets more like 1-1 accepted sockets.
5506 * Set the daddr and initialize id to something more random and also
5507 * copy over any ip options.
5509 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5510 sp->pf->copy_ip_options(sk, sock->sk);
5512 /* Populate the fields of the newsk from the oldsk and migrate the
5513 * asoc to the newsk.
5515 err = sctp_sock_migrate(sk, sock->sk, asoc,
5516 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5526 EXPORT_SYMBOL(sctp_do_peeloff);
5528 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5529 struct file **newfile, unsigned flags)
5531 struct socket *newsock;
5534 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5538 /* Map the socket to an unused fd that can be returned to the user. */
5539 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5541 sock_release(newsock);
5545 *newfile = sock_alloc_file(newsock, 0, NULL);
5546 if (IS_ERR(*newfile)) {
5547 put_unused_fd(retval);
5548 retval = PTR_ERR(*newfile);
5553 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5556 peeloff->sd = retval;
5558 if (flags & SOCK_NONBLOCK)
5559 (*newfile)->f_flags |= O_NONBLOCK;
5564 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5566 sctp_peeloff_arg_t peeloff;
5567 struct file *newfile = NULL;
5570 if (len < sizeof(sctp_peeloff_arg_t))
5572 len = sizeof(sctp_peeloff_arg_t);
5573 if (copy_from_user(&peeloff, optval, len))
5576 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5580 /* Return the fd mapped to the new socket. */
5581 if (put_user(len, optlen)) {
5583 put_unused_fd(retval);
5587 if (copy_to_user(optval, &peeloff, len)) {
5589 put_unused_fd(retval);
5592 fd_install(retval, newfile);
5597 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5598 char __user *optval, int __user *optlen)
5600 sctp_peeloff_flags_arg_t peeloff;
5601 struct file *newfile = NULL;
5604 if (len < sizeof(sctp_peeloff_flags_arg_t))
5606 len = sizeof(sctp_peeloff_flags_arg_t);
5607 if (copy_from_user(&peeloff, optval, len))
5610 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5611 &newfile, peeloff.flags);
5615 /* Return the fd mapped to the new socket. */
5616 if (put_user(len, optlen)) {
5618 put_unused_fd(retval);
5622 if (copy_to_user(optval, &peeloff, len)) {
5624 put_unused_fd(retval);
5627 fd_install(retval, newfile);
5632 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5634 * Applications can enable or disable heartbeats for any peer address of
5635 * an association, modify an address's heartbeat interval, force a
5636 * heartbeat to be sent immediately, and adjust the address's maximum
5637 * number of retransmissions sent before an address is considered
5638 * unreachable. The following structure is used to access and modify an
5639 * address's parameters:
5641 * struct sctp_paddrparams {
5642 * sctp_assoc_t spp_assoc_id;
5643 * struct sockaddr_storage spp_address;
5644 * uint32_t spp_hbinterval;
5645 * uint16_t spp_pathmaxrxt;
5646 * uint32_t spp_pathmtu;
5647 * uint32_t spp_sackdelay;
5648 * uint32_t spp_flags;
5651 * spp_assoc_id - (one-to-many style socket) This is filled in the
5652 * application, and identifies the association for
5654 * spp_address - This specifies which address is of interest.
5655 * spp_hbinterval - This contains the value of the heartbeat interval,
5656 * in milliseconds. If a value of zero
5657 * is present in this field then no changes are to
5658 * be made to this parameter.
5659 * spp_pathmaxrxt - This contains the maximum number of
5660 * retransmissions before this address shall be
5661 * considered unreachable. If a value of zero
5662 * is present in this field then no changes are to
5663 * be made to this parameter.
5664 * spp_pathmtu - When Path MTU discovery is disabled the value
5665 * specified here will be the "fixed" path mtu.
5666 * Note that if the spp_address field is empty
5667 * then all associations on this address will
5668 * have this fixed path mtu set upon them.
5670 * spp_sackdelay - When delayed sack is enabled, this value specifies
5671 * the number of milliseconds that sacks will be delayed
5672 * for. This value will apply to all addresses of an
5673 * association if the spp_address field is empty. Note
5674 * also, that if delayed sack is enabled and this
5675 * value is set to 0, no change is made to the last
5676 * recorded delayed sack timer value.
5678 * spp_flags - These flags are used to control various features
5679 * on an association. The flag field may contain
5680 * zero or more of the following options.
5682 * SPP_HB_ENABLE - Enable heartbeats on the
5683 * specified address. Note that if the address
5684 * field is empty all addresses for the association
5685 * have heartbeats enabled upon them.
5687 * SPP_HB_DISABLE - Disable heartbeats on the
5688 * speicifed address. Note that if the address
5689 * field is empty all addresses for the association
5690 * will have their heartbeats disabled. Note also
5691 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5692 * mutually exclusive, only one of these two should
5693 * be specified. Enabling both fields will have
5694 * undetermined results.
5696 * SPP_HB_DEMAND - Request a user initiated heartbeat
5697 * to be made immediately.
5699 * SPP_PMTUD_ENABLE - This field will enable PMTU
5700 * discovery upon the specified address. Note that
5701 * if the address feild is empty then all addresses
5702 * on the association are effected.
5704 * SPP_PMTUD_DISABLE - This field will disable PMTU
5705 * discovery upon the specified address. Note that
5706 * if the address feild is empty then all addresses
5707 * on the association are effected. Not also that
5708 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5709 * exclusive. Enabling both will have undetermined
5712 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5713 * on delayed sack. The time specified in spp_sackdelay
5714 * is used to specify the sack delay for this address. Note
5715 * that if spp_address is empty then all addresses will
5716 * enable delayed sack and take on the sack delay
5717 * value specified in spp_sackdelay.
5718 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5719 * off delayed sack. If the spp_address field is blank then
5720 * delayed sack is disabled for the entire association. Note
5721 * also that this field is mutually exclusive to
5722 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5725 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5726 * setting of the IPV6 flow label value. The value is
5727 * contained in the spp_ipv6_flowlabel field.
5728 * Upon retrieval, this flag will be set to indicate that
5729 * the spp_ipv6_flowlabel field has a valid value returned.
5730 * If a specific destination address is set (in the
5731 * spp_address field), then the value returned is that of
5732 * the address. If just an association is specified (and
5733 * no address), then the association's default flow label
5734 * is returned. If neither an association nor a destination
5735 * is specified, then the socket's default flow label is
5736 * returned. For non-IPv6 sockets, this flag will be left
5739 * SPP_DSCP: Setting this flag enables the setting of the
5740 * Differentiated Services Code Point (DSCP) value
5741 * associated with either the association or a specific
5742 * address. The value is obtained in the spp_dscp field.
5743 * Upon retrieval, this flag will be set to indicate that
5744 * the spp_dscp field has a valid value returned. If a
5745 * specific destination address is set when called (in the
5746 * spp_address field), then that specific destination
5747 * address's DSCP value is returned. If just an association
5748 * is specified, then the association's default DSCP is
5749 * returned. If neither an association nor a destination is
5750 * specified, then the socket's default DSCP is returned.
5752 * spp_ipv6_flowlabel
5753 * - This field is used in conjunction with the
5754 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5755 * The 20 least significant bits are used for the flow
5756 * label. This setting has precedence over any IPv6-layer
5759 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5760 * and contains the DSCP. The 6 most significant bits are
5761 * used for the DSCP. This setting has precedence over any
5762 * IPv4- or IPv6- layer setting.
5764 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5765 char __user *optval, int __user *optlen)
5767 struct sctp_paddrparams params;
5768 struct sctp_transport *trans = NULL;
5769 struct sctp_association *asoc = NULL;
5770 struct sctp_sock *sp = sctp_sk(sk);
5772 if (len >= sizeof(params))
5773 len = sizeof(params);
5774 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5775 spp_ipv6_flowlabel), 4))
5776 len = ALIGN(offsetof(struct sctp_paddrparams,
5777 spp_ipv6_flowlabel), 4);
5781 if (copy_from_user(¶ms, optval, len))
5784 /* If an address other than INADDR_ANY is specified, and
5785 * no transport is found, then the request is invalid.
5787 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5788 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5789 params.spp_assoc_id);
5791 pr_debug("%s: failed no transport\n", __func__);
5796 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5797 * socket is a one to many style socket, and an association
5798 * was not found, then the id was invalid.
5800 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5801 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5802 sctp_style(sk, UDP)) {
5803 pr_debug("%s: failed no association\n", __func__);
5808 /* Fetch transport values. */
5809 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5810 params.spp_pathmtu = trans->pathmtu;
5811 params.spp_pathmaxrxt = trans->pathmaxrxt;
5812 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5814 /*draft-11 doesn't say what to return in spp_flags*/
5815 params.spp_flags = trans->param_flags;
5816 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5817 params.spp_ipv6_flowlabel = trans->flowlabel &
5818 SCTP_FLOWLABEL_VAL_MASK;
5819 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5821 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5822 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5823 params.spp_flags |= SPP_DSCP;
5826 /* Fetch association values. */
5827 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5828 params.spp_pathmtu = asoc->pathmtu;
5829 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5830 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5832 /*draft-11 doesn't say what to return in spp_flags*/
5833 params.spp_flags = asoc->param_flags;
5834 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5835 params.spp_ipv6_flowlabel = asoc->flowlabel &
5836 SCTP_FLOWLABEL_VAL_MASK;
5837 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5839 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5840 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5841 params.spp_flags |= SPP_DSCP;
5844 /* Fetch socket values. */
5845 params.spp_hbinterval = sp->hbinterval;
5846 params.spp_pathmtu = sp->pathmtu;
5847 params.spp_sackdelay = sp->sackdelay;
5848 params.spp_pathmaxrxt = sp->pathmaxrxt;
5850 /*draft-11 doesn't say what to return in spp_flags*/
5851 params.spp_flags = sp->param_flags;
5852 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5853 params.spp_ipv6_flowlabel = sp->flowlabel &
5854 SCTP_FLOWLABEL_VAL_MASK;
5855 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5857 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5858 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5859 params.spp_flags |= SPP_DSCP;
5863 if (copy_to_user(optval, ¶ms, len))
5866 if (put_user(len, optlen))
5873 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5875 * This option will effect the way delayed acks are performed. This
5876 * option allows you to get or set the delayed ack time, in
5877 * milliseconds. It also allows changing the delayed ack frequency.
5878 * Changing the frequency to 1 disables the delayed sack algorithm. If
5879 * the assoc_id is 0, then this sets or gets the endpoints default
5880 * values. If the assoc_id field is non-zero, then the set or get
5881 * effects the specified association for the one to many model (the
5882 * assoc_id field is ignored by the one to one model). Note that if
5883 * sack_delay or sack_freq are 0 when setting this option, then the
5884 * current values will remain unchanged.
5886 * struct sctp_sack_info {
5887 * sctp_assoc_t sack_assoc_id;
5888 * uint32_t sack_delay;
5889 * uint32_t sack_freq;
5892 * sack_assoc_id - This parameter, indicates which association the user
5893 * is performing an action upon. Note that if this field's value is
5894 * zero then the endpoints default value is changed (effecting future
5895 * associations only).
5897 * sack_delay - This parameter contains the number of milliseconds that
5898 * the user is requesting the delayed ACK timer be set to. Note that
5899 * this value is defined in the standard to be between 200 and 500
5902 * sack_freq - This parameter contains the number of packets that must
5903 * be received before a sack is sent without waiting for the delay
5904 * timer to expire. The default value for this is 2, setting this
5905 * value to 1 will disable the delayed sack algorithm.
5907 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5908 char __user *optval,
5911 struct sctp_sack_info params;
5912 struct sctp_association *asoc = NULL;
5913 struct sctp_sock *sp = sctp_sk(sk);
5915 if (len >= sizeof(struct sctp_sack_info)) {
5916 len = sizeof(struct sctp_sack_info);
5918 if (copy_from_user(¶ms, optval, len))
5920 } else if (len == sizeof(struct sctp_assoc_value)) {
5921 pr_warn_ratelimited(DEPRECATED
5923 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5924 "Use struct sctp_sack_info instead\n",
5925 current->comm, task_pid_nr(current));
5926 if (copy_from_user(¶ms, optval, len))
5931 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5932 * socket is a one to many style socket, and an association
5933 * was not found, then the id was invalid.
5935 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5936 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
5937 sctp_style(sk, UDP))
5941 /* Fetch association values. */
5942 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5943 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
5944 params.sack_freq = asoc->sackfreq;
5947 params.sack_delay = 0;
5948 params.sack_freq = 1;
5951 /* Fetch socket values. */
5952 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5953 params.sack_delay = sp->sackdelay;
5954 params.sack_freq = sp->sackfreq;
5956 params.sack_delay = 0;
5957 params.sack_freq = 1;
5961 if (copy_to_user(optval, ¶ms, len))
5964 if (put_user(len, optlen))
5970 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5972 * Applications can specify protocol parameters for the default association
5973 * initialization. The option name argument to setsockopt() and getsockopt()
5976 * Setting initialization parameters is effective only on an unconnected
5977 * socket (for UDP-style sockets only future associations are effected
5978 * by the change). With TCP-style sockets, this option is inherited by
5979 * sockets derived from a listener socket.
5981 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5983 if (len < sizeof(struct sctp_initmsg))
5985 len = sizeof(struct sctp_initmsg);
5986 if (put_user(len, optlen))
5988 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5994 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5995 char __user *optval, int __user *optlen)
5997 struct sctp_association *asoc;
5999 struct sctp_getaddrs getaddrs;
6000 struct sctp_transport *from;
6002 union sctp_addr temp;
6003 struct sctp_sock *sp = sctp_sk(sk);
6008 if (len < sizeof(struct sctp_getaddrs))
6011 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6014 /* For UDP-style sockets, id specifies the association to query. */
6015 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6019 to = optval + offsetof(struct sctp_getaddrs, addrs);
6020 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6022 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6024 memcpy(&temp, &from->ipaddr, sizeof(temp));
6025 addrlen = sctp_get_pf_specific(sk->sk_family)
6026 ->addr_to_user(sp, &temp);
6027 if (space_left < addrlen)
6029 if (copy_to_user(to, &temp, addrlen))
6033 space_left -= addrlen;
6036 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6038 bytes_copied = ((char __user *)to) - optval;
6039 if (put_user(bytes_copied, optlen))
6045 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6046 size_t space_left, int *bytes_copied)
6048 struct sctp_sockaddr_entry *addr;
6049 union sctp_addr temp;
6052 struct net *net = sock_net(sk);
6055 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6059 if ((PF_INET == sk->sk_family) &&
6060 (AF_INET6 == addr->a.sa.sa_family))
6062 if ((PF_INET6 == sk->sk_family) &&
6063 inet_v6_ipv6only(sk) &&
6064 (AF_INET == addr->a.sa.sa_family))
6066 memcpy(&temp, &addr->a, sizeof(temp));
6067 if (!temp.v4.sin_port)
6068 temp.v4.sin_port = htons(port);
6070 addrlen = sctp_get_pf_specific(sk->sk_family)
6071 ->addr_to_user(sctp_sk(sk), &temp);
6073 if (space_left < addrlen) {
6077 memcpy(to, &temp, addrlen);
6081 space_left -= addrlen;
6082 *bytes_copied += addrlen;
6090 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6091 char __user *optval, int __user *optlen)
6093 struct sctp_bind_addr *bp;
6094 struct sctp_association *asoc;
6096 struct sctp_getaddrs getaddrs;
6097 struct sctp_sockaddr_entry *addr;
6099 union sctp_addr temp;
6100 struct sctp_sock *sp = sctp_sk(sk);
6104 int bytes_copied = 0;
6108 if (len < sizeof(struct sctp_getaddrs))
6111 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6115 * For UDP-style sockets, id specifies the association to query.
6116 * If the id field is set to the value '0' then the locally bound
6117 * addresses are returned without regard to any particular
6120 if (0 == getaddrs.assoc_id) {
6121 bp = &sctp_sk(sk)->ep->base.bind_addr;
6123 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6126 bp = &asoc->base.bind_addr;
6129 to = optval + offsetof(struct sctp_getaddrs, addrs);
6130 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6132 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6136 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6137 * addresses from the global local address list.
6139 if (sctp_list_single_entry(&bp->address_list)) {
6140 addr = list_entry(bp->address_list.next,
6141 struct sctp_sockaddr_entry, list);
6142 if (sctp_is_any(sk, &addr->a)) {
6143 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6144 space_left, &bytes_copied);
6154 /* Protection on the bound address list is not needed since
6155 * in the socket option context we hold a socket lock and
6156 * thus the bound address list can't change.
6158 list_for_each_entry(addr, &bp->address_list, list) {
6159 memcpy(&temp, &addr->a, sizeof(temp));
6160 addrlen = sctp_get_pf_specific(sk->sk_family)
6161 ->addr_to_user(sp, &temp);
6162 if (space_left < addrlen) {
6163 err = -ENOMEM; /*fixme: right error?*/
6166 memcpy(buf, &temp, addrlen);
6168 bytes_copied += addrlen;
6170 space_left -= addrlen;
6174 if (copy_to_user(to, addrs, bytes_copied)) {
6178 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6182 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6183 * but we can't change it anymore.
6185 if (put_user(bytes_copied, optlen))
6192 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6194 * Requests that the local SCTP stack use the enclosed peer address as
6195 * the association primary. The enclosed address must be one of the
6196 * association peer's addresses.
6198 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6199 char __user *optval, int __user *optlen)
6201 struct sctp_prim prim;
6202 struct sctp_association *asoc;
6203 struct sctp_sock *sp = sctp_sk(sk);
6205 if (len < sizeof(struct sctp_prim))
6208 len = sizeof(struct sctp_prim);
6210 if (copy_from_user(&prim, optval, len))
6213 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6217 if (!asoc->peer.primary_path)
6220 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6221 asoc->peer.primary_path->af_specific->sockaddr_len);
6223 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6224 (union sctp_addr *)&prim.ssp_addr);
6226 if (put_user(len, optlen))
6228 if (copy_to_user(optval, &prim, len))
6235 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6237 * Requests that the local endpoint set the specified Adaptation Layer
6238 * Indication parameter for all future INIT and INIT-ACK exchanges.
6240 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6241 char __user *optval, int __user *optlen)
6243 struct sctp_setadaptation adaptation;
6245 if (len < sizeof(struct sctp_setadaptation))
6248 len = sizeof(struct sctp_setadaptation);
6250 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6252 if (put_user(len, optlen))
6254 if (copy_to_user(optval, &adaptation, len))
6262 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6264 * Applications that wish to use the sendto() system call may wish to
6265 * specify a default set of parameters that would normally be supplied
6266 * through the inclusion of ancillary data. This socket option allows
6267 * such an application to set the default sctp_sndrcvinfo structure.
6270 * The application that wishes to use this socket option simply passes
6271 * in to this call the sctp_sndrcvinfo structure defined in Section
6272 * 5.2.2) The input parameters accepted by this call include
6273 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6274 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6275 * to this call if the caller is using the UDP model.
6277 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6279 static int sctp_getsockopt_default_send_param(struct sock *sk,
6280 int len, char __user *optval,
6283 struct sctp_sock *sp = sctp_sk(sk);
6284 struct sctp_association *asoc;
6285 struct sctp_sndrcvinfo info;
6287 if (len < sizeof(info))
6292 if (copy_from_user(&info, optval, len))
6295 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6296 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6297 sctp_style(sk, UDP))
6301 info.sinfo_stream = asoc->default_stream;
6302 info.sinfo_flags = asoc->default_flags;
6303 info.sinfo_ppid = asoc->default_ppid;
6304 info.sinfo_context = asoc->default_context;
6305 info.sinfo_timetolive = asoc->default_timetolive;
6307 info.sinfo_stream = sp->default_stream;
6308 info.sinfo_flags = sp->default_flags;
6309 info.sinfo_ppid = sp->default_ppid;
6310 info.sinfo_context = sp->default_context;
6311 info.sinfo_timetolive = sp->default_timetolive;
6314 if (put_user(len, optlen))
6316 if (copy_to_user(optval, &info, len))
6322 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6323 * (SCTP_DEFAULT_SNDINFO)
6325 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6326 char __user *optval,
6329 struct sctp_sock *sp = sctp_sk(sk);
6330 struct sctp_association *asoc;
6331 struct sctp_sndinfo info;
6333 if (len < sizeof(info))
6338 if (copy_from_user(&info, optval, len))
6341 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6342 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6343 sctp_style(sk, UDP))
6347 info.snd_sid = asoc->default_stream;
6348 info.snd_flags = asoc->default_flags;
6349 info.snd_ppid = asoc->default_ppid;
6350 info.snd_context = asoc->default_context;
6352 info.snd_sid = sp->default_stream;
6353 info.snd_flags = sp->default_flags;
6354 info.snd_ppid = sp->default_ppid;
6355 info.snd_context = sp->default_context;
6358 if (put_user(len, optlen))
6360 if (copy_to_user(optval, &info, len))
6368 * 7.1.5 SCTP_NODELAY
6370 * Turn on/off any Nagle-like algorithm. This means that packets are
6371 * generally sent as soon as possible and no unnecessary delays are
6372 * introduced, at the cost of more packets in the network. Expects an
6373 * integer boolean flag.
6376 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6377 char __user *optval, int __user *optlen)
6381 if (len < sizeof(int))
6385 val = (sctp_sk(sk)->nodelay == 1);
6386 if (put_user(len, optlen))
6388 if (copy_to_user(optval, &val, len))
6395 * 7.1.1 SCTP_RTOINFO
6397 * The protocol parameters used to initialize and bound retransmission
6398 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6399 * and modify these parameters.
6400 * All parameters are time values, in milliseconds. A value of 0, when
6401 * modifying the parameters, indicates that the current value should not
6405 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6406 char __user *optval,
6407 int __user *optlen) {
6408 struct sctp_rtoinfo rtoinfo;
6409 struct sctp_association *asoc;
6411 if (len < sizeof (struct sctp_rtoinfo))
6414 len = sizeof(struct sctp_rtoinfo);
6416 if (copy_from_user(&rtoinfo, optval, len))
6419 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6421 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6422 sctp_style(sk, UDP))
6425 /* Values corresponding to the specific association. */
6427 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6428 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6429 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6431 /* Values corresponding to the endpoint. */
6432 struct sctp_sock *sp = sctp_sk(sk);
6434 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6435 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6436 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6439 if (put_user(len, optlen))
6442 if (copy_to_user(optval, &rtoinfo, len))
6450 * 7.1.2 SCTP_ASSOCINFO
6452 * This option is used to tune the maximum retransmission attempts
6453 * of the association.
6454 * Returns an error if the new association retransmission value is
6455 * greater than the sum of the retransmission value of the peer.
6456 * See [SCTP] for more information.
6459 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6460 char __user *optval,
6464 struct sctp_assocparams assocparams;
6465 struct sctp_association *asoc;
6466 struct list_head *pos;
6469 if (len < sizeof (struct sctp_assocparams))
6472 len = sizeof(struct sctp_assocparams);
6474 if (copy_from_user(&assocparams, optval, len))
6477 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6479 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6480 sctp_style(sk, UDP))
6483 /* Values correspoinding to the specific association */
6485 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6486 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6487 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6488 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6490 list_for_each(pos, &asoc->peer.transport_addr_list) {
6494 assocparams.sasoc_number_peer_destinations = cnt;
6496 /* Values corresponding to the endpoint */
6497 struct sctp_sock *sp = sctp_sk(sk);
6499 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6500 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6501 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6502 assocparams.sasoc_cookie_life =
6503 sp->assocparams.sasoc_cookie_life;
6504 assocparams.sasoc_number_peer_destinations =
6506 sasoc_number_peer_destinations;
6509 if (put_user(len, optlen))
6512 if (copy_to_user(optval, &assocparams, len))
6519 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6521 * This socket option is a boolean flag which turns on or off mapped V4
6522 * addresses. If this option is turned on and the socket is type
6523 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6524 * If this option is turned off, then no mapping will be done of V4
6525 * addresses and a user will receive both PF_INET6 and PF_INET type
6526 * addresses on the socket.
6528 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6529 char __user *optval, int __user *optlen)
6532 struct sctp_sock *sp = sctp_sk(sk);
6534 if (len < sizeof(int))
6539 if (put_user(len, optlen))
6541 if (copy_to_user(optval, &val, len))
6548 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6549 * (chapter and verse is quoted at sctp_setsockopt_context())
6551 static int sctp_getsockopt_context(struct sock *sk, int len,
6552 char __user *optval, int __user *optlen)
6554 struct sctp_assoc_value params;
6555 struct sctp_association *asoc;
6557 if (len < sizeof(struct sctp_assoc_value))
6560 len = sizeof(struct sctp_assoc_value);
6562 if (copy_from_user(¶ms, optval, len))
6565 asoc = sctp_id2assoc(sk, params.assoc_id);
6566 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6567 sctp_style(sk, UDP))
6570 params.assoc_value = asoc ? asoc->default_rcv_context
6571 : sctp_sk(sk)->default_rcv_context;
6573 if (put_user(len, optlen))
6575 if (copy_to_user(optval, ¶ms, len))
6582 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6583 * This option will get or set the maximum size to put in any outgoing
6584 * SCTP DATA chunk. If a message is larger than this size it will be
6585 * fragmented by SCTP into the specified size. Note that the underlying
6586 * SCTP implementation may fragment into smaller sized chunks when the
6587 * PMTU of the underlying association is smaller than the value set by
6588 * the user. The default value for this option is '0' which indicates
6589 * the user is NOT limiting fragmentation and only the PMTU will effect
6590 * SCTP's choice of DATA chunk size. Note also that values set larger
6591 * than the maximum size of an IP datagram will effectively let SCTP
6592 * control fragmentation (i.e. the same as setting this option to 0).
6594 * The following structure is used to access and modify this parameter:
6596 * struct sctp_assoc_value {
6597 * sctp_assoc_t assoc_id;
6598 * uint32_t assoc_value;
6601 * assoc_id: This parameter is ignored for one-to-one style sockets.
6602 * For one-to-many style sockets this parameter indicates which
6603 * association the user is performing an action upon. Note that if
6604 * this field's value is zero then the endpoints default value is
6605 * changed (effecting future associations only).
6606 * assoc_value: This parameter specifies the maximum size in bytes.
6608 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6609 char __user *optval, int __user *optlen)
6611 struct sctp_assoc_value params;
6612 struct sctp_association *asoc;
6614 if (len == sizeof(int)) {
6615 pr_warn_ratelimited(DEPRECATED
6617 "Use of int in maxseg socket option.\n"
6618 "Use struct sctp_assoc_value instead\n",
6619 current->comm, task_pid_nr(current));
6620 params.assoc_id = SCTP_FUTURE_ASSOC;
6621 } else if (len >= sizeof(struct sctp_assoc_value)) {
6622 len = sizeof(struct sctp_assoc_value);
6623 if (copy_from_user(¶ms, optval, len))
6628 asoc = sctp_id2assoc(sk, params.assoc_id);
6629 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6630 sctp_style(sk, UDP))
6634 params.assoc_value = asoc->frag_point;
6636 params.assoc_value = sctp_sk(sk)->user_frag;
6638 if (put_user(len, optlen))
6640 if (len == sizeof(int)) {
6641 if (copy_to_user(optval, ¶ms.assoc_value, len))
6644 if (copy_to_user(optval, ¶ms, len))
6652 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6653 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6655 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6656 char __user *optval, int __user *optlen)
6660 if (len < sizeof(int))
6665 val = sctp_sk(sk)->frag_interleave;
6666 if (put_user(len, optlen))
6668 if (copy_to_user(optval, &val, len))
6675 * 7.1.25. Set or Get the sctp partial delivery point
6676 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6678 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6679 char __user *optval,
6684 if (len < sizeof(u32))
6689 val = sctp_sk(sk)->pd_point;
6690 if (put_user(len, optlen))
6692 if (copy_to_user(optval, &val, len))
6699 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6700 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6702 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6703 char __user *optval,
6706 struct sctp_assoc_value params;
6707 struct sctp_association *asoc;
6709 if (len == sizeof(int)) {
6710 pr_warn_ratelimited(DEPRECATED
6712 "Use of int in max_burst socket option.\n"
6713 "Use struct sctp_assoc_value instead\n",
6714 current->comm, task_pid_nr(current));
6715 params.assoc_id = SCTP_FUTURE_ASSOC;
6716 } else if (len >= sizeof(struct sctp_assoc_value)) {
6717 len = sizeof(struct sctp_assoc_value);
6718 if (copy_from_user(¶ms, optval, len))
6723 asoc = sctp_id2assoc(sk, params.assoc_id);
6724 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6725 sctp_style(sk, UDP))
6728 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6730 if (len == sizeof(int)) {
6731 if (copy_to_user(optval, ¶ms.assoc_value, len))
6734 if (copy_to_user(optval, ¶ms, len))
6742 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6743 char __user *optval, int __user *optlen)
6745 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6746 struct sctp_hmacalgo __user *p = (void __user *)optval;
6747 struct sctp_hmac_algo_param *hmacs;
6752 if (!ep->auth_enable)
6755 hmacs = ep->auth_hmacs_list;
6756 data_len = ntohs(hmacs->param_hdr.length) -
6757 sizeof(struct sctp_paramhdr);
6759 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6762 len = sizeof(struct sctp_hmacalgo) + data_len;
6763 num_idents = data_len / sizeof(u16);
6765 if (put_user(len, optlen))
6767 if (put_user(num_idents, &p->shmac_num_idents))
6769 for (i = 0; i < num_idents; i++) {
6770 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6772 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6778 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6779 char __user *optval, int __user *optlen)
6781 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6782 struct sctp_authkeyid val;
6783 struct sctp_association *asoc;
6785 if (len < sizeof(struct sctp_authkeyid))
6788 len = sizeof(struct sctp_authkeyid);
6789 if (copy_from_user(&val, optval, len))
6792 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6793 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6797 if (!asoc->peer.auth_capable)
6799 val.scact_keynumber = asoc->active_key_id;
6801 if (!ep->auth_enable)
6803 val.scact_keynumber = ep->active_key_id;
6806 if (put_user(len, optlen))
6808 if (copy_to_user(optval, &val, len))
6814 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6815 char __user *optval, int __user *optlen)
6817 struct sctp_authchunks __user *p = (void __user *)optval;
6818 struct sctp_authchunks val;
6819 struct sctp_association *asoc;
6820 struct sctp_chunks_param *ch;
6824 if (len < sizeof(struct sctp_authchunks))
6827 if (copy_from_user(&val, optval, sizeof(val)))
6830 to = p->gauth_chunks;
6831 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6835 if (!asoc->peer.auth_capable)
6838 ch = asoc->peer.peer_chunks;
6842 /* See if the user provided enough room for all the data */
6843 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6844 if (len < num_chunks)
6847 if (copy_to_user(to, ch->chunks, num_chunks))
6850 len = sizeof(struct sctp_authchunks) + num_chunks;
6851 if (put_user(len, optlen))
6853 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6858 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6859 char __user *optval, int __user *optlen)
6861 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6862 struct sctp_authchunks __user *p = (void __user *)optval;
6863 struct sctp_authchunks val;
6864 struct sctp_association *asoc;
6865 struct sctp_chunks_param *ch;
6869 if (len < sizeof(struct sctp_authchunks))
6872 if (copy_from_user(&val, optval, sizeof(val)))
6875 to = p->gauth_chunks;
6876 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6877 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6878 sctp_style(sk, UDP))
6882 if (!asoc->peer.auth_capable)
6884 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6886 if (!ep->auth_enable)
6888 ch = ep->auth_chunk_list;
6893 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6894 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6897 if (copy_to_user(to, ch->chunks, num_chunks))
6900 len = sizeof(struct sctp_authchunks) + num_chunks;
6901 if (put_user(len, optlen))
6903 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6910 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6911 * This option gets the current number of associations that are attached
6912 * to a one-to-many style socket. The option value is an uint32_t.
6914 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6915 char __user *optval, int __user *optlen)
6917 struct sctp_sock *sp = sctp_sk(sk);
6918 struct sctp_association *asoc;
6921 if (sctp_style(sk, TCP))
6924 if (len < sizeof(u32))
6929 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6933 if (put_user(len, optlen))
6935 if (copy_to_user(optval, &val, len))
6942 * 8.1.23 SCTP_AUTO_ASCONF
6943 * See the corresponding setsockopt entry as description
6945 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
6946 char __user *optval, int __user *optlen)
6950 if (len < sizeof(int))
6954 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
6956 if (put_user(len, optlen))
6958 if (copy_to_user(optval, &val, len))
6964 * 8.2.6. Get the Current Identifiers of Associations
6965 * (SCTP_GET_ASSOC_ID_LIST)
6967 * This option gets the current list of SCTP association identifiers of
6968 * the SCTP associations handled by a one-to-many style socket.
6970 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
6971 char __user *optval, int __user *optlen)
6973 struct sctp_sock *sp = sctp_sk(sk);
6974 struct sctp_association *asoc;
6975 struct sctp_assoc_ids *ids;
6978 if (sctp_style(sk, TCP))
6981 if (len < sizeof(struct sctp_assoc_ids))
6984 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6988 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
6991 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
6993 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6997 ids->gaids_number_of_ids = num;
6999 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7000 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7003 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7013 * SCTP_PEER_ADDR_THLDS
7015 * This option allows us to fetch the partially failed threshold for one or all
7016 * transports in an association. See Section 6.1 of:
7017 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7019 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7020 char __user *optval, int len,
7021 int __user *optlen, bool v2)
7023 struct sctp_paddrthlds_v2 val;
7024 struct sctp_transport *trans;
7025 struct sctp_association *asoc;
7028 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7032 if (copy_from_user(&val, optval, len))
7035 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7036 trans = sctp_addr_id2transport(sk, &val.spt_address,
7041 val.spt_pathmaxrxt = trans->pathmaxrxt;
7042 val.spt_pathpfthld = trans->pf_retrans;
7043 val.spt_pathcpthld = trans->ps_retrans;
7048 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7049 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7050 sctp_style(sk, UDP))
7054 val.spt_pathpfthld = asoc->pf_retrans;
7055 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7056 val.spt_pathcpthld = asoc->ps_retrans;
7058 struct sctp_sock *sp = sctp_sk(sk);
7060 val.spt_pathpfthld = sp->pf_retrans;
7061 val.spt_pathmaxrxt = sp->pathmaxrxt;
7062 val.spt_pathcpthld = sp->ps_retrans;
7066 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7073 * SCTP_GET_ASSOC_STATS
7075 * This option retrieves local per endpoint statistics. It is modeled
7076 * after OpenSolaris' implementation
7078 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7079 char __user *optval,
7082 struct sctp_assoc_stats sas;
7083 struct sctp_association *asoc = NULL;
7085 /* User must provide at least the assoc id */
7086 if (len < sizeof(sctp_assoc_t))
7089 /* Allow the struct to grow and fill in as much as possible */
7090 len = min_t(size_t, len, sizeof(sas));
7092 if (copy_from_user(&sas, optval, len))
7095 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7099 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7100 sas.sas_gapcnt = asoc->stats.gapcnt;
7101 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7102 sas.sas_osacks = asoc->stats.osacks;
7103 sas.sas_isacks = asoc->stats.isacks;
7104 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7105 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7106 sas.sas_oodchunks = asoc->stats.oodchunks;
7107 sas.sas_iodchunks = asoc->stats.iodchunks;
7108 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7109 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7110 sas.sas_idupchunks = asoc->stats.idupchunks;
7111 sas.sas_opackets = asoc->stats.opackets;
7112 sas.sas_ipackets = asoc->stats.ipackets;
7114 /* New high max rto observed, will return 0 if not a single
7115 * RTO update took place. obs_rto_ipaddr will be bogus
7118 sas.sas_maxrto = asoc->stats.max_obs_rto;
7119 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7120 sizeof(struct sockaddr_storage));
7122 /* Mark beginning of a new observation period */
7123 asoc->stats.max_obs_rto = asoc->rto_min;
7125 if (put_user(len, optlen))
7128 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7130 if (copy_to_user(optval, &sas, len))
7136 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7137 char __user *optval,
7142 if (len < sizeof(int))
7146 if (sctp_sk(sk)->recvrcvinfo)
7148 if (put_user(len, optlen))
7150 if (copy_to_user(optval, &val, len))
7156 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7157 char __user *optval,
7162 if (len < sizeof(int))
7166 if (sctp_sk(sk)->recvnxtinfo)
7168 if (put_user(len, optlen))
7170 if (copy_to_user(optval, &val, len))
7176 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7177 char __user *optval,
7180 struct sctp_assoc_value params;
7181 struct sctp_association *asoc;
7182 int retval = -EFAULT;
7184 if (len < sizeof(params)) {
7189 len = sizeof(params);
7190 if (copy_from_user(¶ms, optval, len))
7193 asoc = sctp_id2assoc(sk, params.assoc_id);
7194 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7195 sctp_style(sk, UDP)) {
7200 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7201 : sctp_sk(sk)->ep->prsctp_enable;
7203 if (put_user(len, optlen))
7206 if (copy_to_user(optval, ¶ms, len))
7215 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7216 char __user *optval,
7219 struct sctp_default_prinfo info;
7220 struct sctp_association *asoc;
7221 int retval = -EFAULT;
7223 if (len < sizeof(info)) {
7229 if (copy_from_user(&info, optval, len))
7232 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7233 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7234 sctp_style(sk, UDP)) {
7240 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7241 info.pr_value = asoc->default_timetolive;
7243 struct sctp_sock *sp = sctp_sk(sk);
7245 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7246 info.pr_value = sp->default_timetolive;
7249 if (put_user(len, optlen))
7252 if (copy_to_user(optval, &info, len))
7261 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7262 char __user *optval,
7265 struct sctp_prstatus params;
7266 struct sctp_association *asoc;
7268 int retval = -EINVAL;
7270 if (len < sizeof(params))
7273 len = sizeof(params);
7274 if (copy_from_user(¶ms, optval, len)) {
7279 policy = params.sprstat_policy;
7280 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7281 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7284 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7288 if (policy == SCTP_PR_SCTP_ALL) {
7289 params.sprstat_abandoned_unsent = 0;
7290 params.sprstat_abandoned_sent = 0;
7291 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7292 params.sprstat_abandoned_unsent +=
7293 asoc->abandoned_unsent[policy];
7294 params.sprstat_abandoned_sent +=
7295 asoc->abandoned_sent[policy];
7298 params.sprstat_abandoned_unsent =
7299 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7300 params.sprstat_abandoned_sent =
7301 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7304 if (put_user(len, optlen)) {
7309 if (copy_to_user(optval, ¶ms, len)) {
7320 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7321 char __user *optval,
7324 struct sctp_stream_out_ext *streamoute;
7325 struct sctp_association *asoc;
7326 struct sctp_prstatus params;
7327 int retval = -EINVAL;
7330 if (len < sizeof(params))
7333 len = sizeof(params);
7334 if (copy_from_user(¶ms, optval, len)) {
7339 policy = params.sprstat_policy;
7340 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7341 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7344 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7345 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7348 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7350 /* Not allocated yet, means all stats are 0 */
7351 params.sprstat_abandoned_unsent = 0;
7352 params.sprstat_abandoned_sent = 0;
7357 if (policy == SCTP_PR_SCTP_ALL) {
7358 params.sprstat_abandoned_unsent = 0;
7359 params.sprstat_abandoned_sent = 0;
7360 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7361 params.sprstat_abandoned_unsent +=
7362 streamoute->abandoned_unsent[policy];
7363 params.sprstat_abandoned_sent +=
7364 streamoute->abandoned_sent[policy];
7367 params.sprstat_abandoned_unsent =
7368 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7369 params.sprstat_abandoned_sent =
7370 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7373 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7384 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7385 char __user *optval,
7388 struct sctp_assoc_value params;
7389 struct sctp_association *asoc;
7390 int retval = -EFAULT;
7392 if (len < sizeof(params)) {
7397 len = sizeof(params);
7398 if (copy_from_user(¶ms, optval, len))
7401 asoc = sctp_id2assoc(sk, params.assoc_id);
7402 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7403 sctp_style(sk, UDP)) {
7408 params.assoc_value = asoc ? asoc->peer.reconf_capable
7409 : sctp_sk(sk)->ep->reconf_enable;
7411 if (put_user(len, optlen))
7414 if (copy_to_user(optval, ¶ms, len))
7423 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7424 char __user *optval,
7427 struct sctp_assoc_value params;
7428 struct sctp_association *asoc;
7429 int retval = -EFAULT;
7431 if (len < sizeof(params)) {
7436 len = sizeof(params);
7437 if (copy_from_user(¶ms, optval, len))
7440 asoc = sctp_id2assoc(sk, params.assoc_id);
7441 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7442 sctp_style(sk, UDP)) {
7447 params.assoc_value = asoc ? asoc->strreset_enable
7448 : sctp_sk(sk)->ep->strreset_enable;
7450 if (put_user(len, optlen))
7453 if (copy_to_user(optval, ¶ms, len))
7462 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7463 char __user *optval,
7466 struct sctp_assoc_value params;
7467 struct sctp_association *asoc;
7468 int retval = -EFAULT;
7470 if (len < sizeof(params)) {
7475 len = sizeof(params);
7476 if (copy_from_user(¶ms, optval, len))
7479 asoc = sctp_id2assoc(sk, params.assoc_id);
7480 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7481 sctp_style(sk, UDP)) {
7486 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7487 : sctp_sk(sk)->default_ss;
7489 if (put_user(len, optlen))
7492 if (copy_to_user(optval, ¶ms, len))
7501 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7502 char __user *optval,
7505 struct sctp_stream_value params;
7506 struct sctp_association *asoc;
7507 int retval = -EFAULT;
7509 if (len < sizeof(params)) {
7514 len = sizeof(params);
7515 if (copy_from_user(¶ms, optval, len))
7518 asoc = sctp_id2assoc(sk, params.assoc_id);
7524 retval = sctp_sched_get_value(asoc, params.stream_id,
7525 ¶ms.stream_value);
7529 if (put_user(len, optlen)) {
7534 if (copy_to_user(optval, ¶ms, len)) {
7543 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7544 char __user *optval,
7547 struct sctp_assoc_value params;
7548 struct sctp_association *asoc;
7549 int retval = -EFAULT;
7551 if (len < sizeof(params)) {
7556 len = sizeof(params);
7557 if (copy_from_user(¶ms, optval, len))
7560 asoc = sctp_id2assoc(sk, params.assoc_id);
7561 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7562 sctp_style(sk, UDP)) {
7567 params.assoc_value = asoc ? asoc->peer.intl_capable
7568 : sctp_sk(sk)->ep->intl_enable;
7570 if (put_user(len, optlen))
7573 if (copy_to_user(optval, ¶ms, len))
7582 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7583 char __user *optval,
7588 if (len < sizeof(int))
7592 val = sctp_sk(sk)->reuse;
7593 if (put_user(len, optlen))
7596 if (copy_to_user(optval, &val, len))
7602 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7605 struct sctp_association *asoc;
7606 struct sctp_event param;
7609 if (len < sizeof(param))
7612 len = sizeof(param);
7613 if (copy_from_user(¶m, optval, len))
7616 if (param.se_type < SCTP_SN_TYPE_BASE ||
7617 param.se_type > SCTP_SN_TYPE_MAX)
7620 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7621 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7622 sctp_style(sk, UDP))
7625 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7626 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7628 if (put_user(len, optlen))
7631 if (copy_to_user(optval, ¶m, len))
7637 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7638 char __user *optval,
7641 struct sctp_assoc_value params;
7642 struct sctp_association *asoc;
7643 int retval = -EFAULT;
7645 if (len < sizeof(params)) {
7650 len = sizeof(params);
7651 if (copy_from_user(¶ms, optval, len))
7654 asoc = sctp_id2assoc(sk, params.assoc_id);
7655 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7656 sctp_style(sk, UDP)) {
7661 params.assoc_value = asoc ? asoc->peer.asconf_capable
7662 : sctp_sk(sk)->ep->asconf_enable;
7664 if (put_user(len, optlen))
7667 if (copy_to_user(optval, ¶ms, len))
7676 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7677 char __user *optval,
7680 struct sctp_assoc_value params;
7681 struct sctp_association *asoc;
7682 int retval = -EFAULT;
7684 if (len < sizeof(params)) {
7689 len = sizeof(params);
7690 if (copy_from_user(¶ms, optval, len))
7693 asoc = sctp_id2assoc(sk, params.assoc_id);
7694 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7695 sctp_style(sk, UDP)) {
7700 params.assoc_value = asoc ? asoc->peer.auth_capable
7701 : sctp_sk(sk)->ep->auth_enable;
7703 if (put_user(len, optlen))
7706 if (copy_to_user(optval, ¶ms, len))
7715 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7716 char __user *optval,
7719 struct sctp_assoc_value params;
7720 struct sctp_association *asoc;
7721 int retval = -EFAULT;
7723 if (len < sizeof(params)) {
7728 len = sizeof(params);
7729 if (copy_from_user(¶ms, optval, len))
7732 asoc = sctp_id2assoc(sk, params.assoc_id);
7733 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7734 sctp_style(sk, UDP)) {
7739 params.assoc_value = asoc ? asoc->peer.ecn_capable
7740 : sctp_sk(sk)->ep->ecn_enable;
7742 if (put_user(len, optlen))
7745 if (copy_to_user(optval, ¶ms, len))
7754 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7755 char __user *optval,
7758 struct sctp_assoc_value params;
7759 struct sctp_association *asoc;
7760 int retval = -EFAULT;
7762 if (len < sizeof(params)) {
7767 len = sizeof(params);
7768 if (copy_from_user(¶ms, optval, len))
7771 asoc = sctp_id2assoc(sk, params.assoc_id);
7772 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7773 sctp_style(sk, UDP)) {
7778 params.assoc_value = asoc ? asoc->pf_expose
7779 : sctp_sk(sk)->pf_expose;
7781 if (put_user(len, optlen))
7784 if (copy_to_user(optval, ¶ms, len))
7793 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7794 char __user *optval, int __user *optlen)
7799 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7801 /* I can hardly begin to describe how wrong this is. This is
7802 * so broken as to be worse than useless. The API draft
7803 * REALLY is NOT helpful here... I am not convinced that the
7804 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7805 * are at all well-founded.
7807 if (level != SOL_SCTP) {
7808 struct sctp_af *af = sctp_sk(sk)->pf->af;
7810 retval = af->getsockopt(sk, level, optname, optval, optlen);
7814 if (get_user(len, optlen))
7824 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7826 case SCTP_DISABLE_FRAGMENTS:
7827 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7831 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7833 case SCTP_AUTOCLOSE:
7834 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7836 case SCTP_SOCKOPT_PEELOFF:
7837 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7839 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7840 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7842 case SCTP_PEER_ADDR_PARAMS:
7843 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7846 case SCTP_DELAYED_SACK:
7847 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7851 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7853 case SCTP_GET_PEER_ADDRS:
7854 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7857 case SCTP_GET_LOCAL_ADDRS:
7858 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7861 case SCTP_SOCKOPT_CONNECTX3:
7862 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7864 case SCTP_DEFAULT_SEND_PARAM:
7865 retval = sctp_getsockopt_default_send_param(sk, len,
7868 case SCTP_DEFAULT_SNDINFO:
7869 retval = sctp_getsockopt_default_sndinfo(sk, len,
7872 case SCTP_PRIMARY_ADDR:
7873 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7876 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7879 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7881 case SCTP_ASSOCINFO:
7882 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7884 case SCTP_I_WANT_MAPPED_V4_ADDR:
7885 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7888 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7890 case SCTP_GET_PEER_ADDR_INFO:
7891 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7894 case SCTP_ADAPTATION_LAYER:
7895 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7899 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7901 case SCTP_FRAGMENT_INTERLEAVE:
7902 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7905 case SCTP_PARTIAL_DELIVERY_POINT:
7906 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7909 case SCTP_MAX_BURST:
7910 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7913 case SCTP_AUTH_CHUNK:
7914 case SCTP_AUTH_DELETE_KEY:
7915 case SCTP_AUTH_DEACTIVATE_KEY:
7916 retval = -EOPNOTSUPP;
7918 case SCTP_HMAC_IDENT:
7919 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7921 case SCTP_AUTH_ACTIVE_KEY:
7922 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7924 case SCTP_PEER_AUTH_CHUNKS:
7925 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7928 case SCTP_LOCAL_AUTH_CHUNKS:
7929 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7932 case SCTP_GET_ASSOC_NUMBER:
7933 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7935 case SCTP_GET_ASSOC_ID_LIST:
7936 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7938 case SCTP_AUTO_ASCONF:
7939 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7941 case SCTP_PEER_ADDR_THLDS:
7942 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
7945 case SCTP_PEER_ADDR_THLDS_V2:
7946 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
7949 case SCTP_GET_ASSOC_STATS:
7950 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7952 case SCTP_RECVRCVINFO:
7953 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7955 case SCTP_RECVNXTINFO:
7956 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7958 case SCTP_PR_SUPPORTED:
7959 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7961 case SCTP_DEFAULT_PRINFO:
7962 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7965 case SCTP_PR_ASSOC_STATUS:
7966 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7969 case SCTP_PR_STREAM_STATUS:
7970 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7973 case SCTP_RECONFIG_SUPPORTED:
7974 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7977 case SCTP_ENABLE_STREAM_RESET:
7978 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7981 case SCTP_STREAM_SCHEDULER:
7982 retval = sctp_getsockopt_scheduler(sk, len, optval,
7985 case SCTP_STREAM_SCHEDULER_VALUE:
7986 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7989 case SCTP_INTERLEAVING_SUPPORTED:
7990 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7993 case SCTP_REUSE_PORT:
7994 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
7997 retval = sctp_getsockopt_event(sk, len, optval, optlen);
7999 case SCTP_ASCONF_SUPPORTED:
8000 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8003 case SCTP_AUTH_SUPPORTED:
8004 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8007 case SCTP_ECN_SUPPORTED:
8008 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8010 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8011 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8014 retval = -ENOPROTOOPT;
8022 static int sctp_hash(struct sock *sk)
8028 static void sctp_unhash(struct sock *sk)
8033 /* Check if port is acceptable. Possibly find first available port.
8035 * The port hash table (contained in the 'global' SCTP protocol storage
8036 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8037 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8038 * list (the list number is the port number hashed out, so as you
8039 * would expect from a hash function, all the ports in a given list have
8040 * such a number that hashes out to the same list number; you were
8041 * expecting that, right?); so each list has a set of ports, with a
8042 * link to the socket (struct sock) that uses it, the port number and
8043 * a fastreuse flag (FIXME: NPI ipg).
8045 static struct sctp_bind_bucket *sctp_bucket_create(
8046 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8048 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8050 struct sctp_sock *sp = sctp_sk(sk);
8051 bool reuse = (sk->sk_reuse || sp->reuse);
8052 struct sctp_bind_hashbucket *head; /* hash list */
8053 struct net *net = sock_net(sk);
8054 kuid_t uid = sock_i_uid(sk);
8055 struct sctp_bind_bucket *pp;
8056 unsigned short snum;
8059 snum = ntohs(addr->v4.sin_port);
8061 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8064 /* Search for an available port. */
8065 int low, high, remaining, index;
8068 inet_get_local_port_range(net, &low, &high);
8069 remaining = (high - low) + 1;
8070 rover = prandom_u32() % remaining + low;
8074 if ((rover < low) || (rover > high))
8076 if (inet_is_local_reserved_port(net, rover))
8078 index = sctp_phashfn(net, rover);
8079 head = &sctp_port_hashtable[index];
8080 spin_lock_bh(&head->lock);
8081 sctp_for_each_hentry(pp, &head->chain)
8082 if ((pp->port == rover) &&
8083 net_eq(net, pp->net))
8087 spin_unlock_bh(&head->lock);
8089 } while (--remaining > 0);
8091 /* Exhausted local port range during search? */
8096 /* OK, here is the one we will use. HEAD (the port
8097 * hash table list entry) is non-NULL and we hold it's
8102 /* We are given an specific port number; we verify
8103 * that it is not being used. If it is used, we will
8104 * exahust the search in the hash list corresponding
8105 * to the port number (snum) - we detect that with the
8106 * port iterator, pp being NULL.
8108 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8109 spin_lock_bh(&head->lock);
8110 sctp_for_each_hentry(pp, &head->chain) {
8111 if ((pp->port == snum) && net_eq(pp->net, net))
8118 if (!hlist_empty(&pp->owner)) {
8119 /* We had a port hash table hit - there is an
8120 * available port (pp != NULL) and it is being
8121 * used by other socket (pp->owner not empty); that other
8122 * socket is going to be sk2.
8126 pr_debug("%s: found a possible match\n", __func__);
8128 if ((pp->fastreuse && reuse &&
8129 sk->sk_state != SCTP_SS_LISTENING) ||
8130 (pp->fastreuseport && sk->sk_reuseport &&
8131 uid_eq(pp->fastuid, uid)))
8134 /* Run through the list of sockets bound to the port
8135 * (pp->port) [via the pointers bind_next and
8136 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8137 * we get the endpoint they describe and run through
8138 * the endpoint's list of IP (v4 or v6) addresses,
8139 * comparing each of the addresses with the address of
8140 * the socket sk. If we find a match, then that means
8141 * that this port/socket (sk) combination are already
8144 sk_for_each_bound(sk2, &pp->owner) {
8145 struct sctp_sock *sp2 = sctp_sk(sk2);
8146 struct sctp_endpoint *ep2 = sp2->ep;
8149 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8150 sk2->sk_state != SCTP_SS_LISTENING) ||
8151 (sk->sk_reuseport && sk2->sk_reuseport &&
8152 uid_eq(uid, sock_i_uid(sk2))))
8155 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8162 pr_debug("%s: found a match\n", __func__);
8165 /* If there was a hash table miss, create a new port. */
8167 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8170 /* In either case (hit or miss), make sure fastreuse is 1 only
8171 * if sk->sk_reuse is too (that is, if the caller requested
8172 * SO_REUSEADDR on this socket -sk-).
8174 if (hlist_empty(&pp->owner)) {
8175 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8180 if (sk->sk_reuseport) {
8181 pp->fastreuseport = 1;
8184 pp->fastreuseport = 0;
8187 if (pp->fastreuse &&
8188 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8191 if (pp->fastreuseport &&
8192 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8193 pp->fastreuseport = 0;
8196 /* We are set, so fill up all the data in the hash table
8197 * entry, tie the socket list information with the rest of the
8198 * sockets FIXME: Blurry, NPI (ipg).
8201 if (!sp->bind_hash) {
8202 inet_sk(sk)->inet_num = snum;
8203 sk_add_bind_node(sk, &pp->owner);
8209 spin_unlock_bh(&head->lock);
8213 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8214 * port is requested.
8216 static int sctp_get_port(struct sock *sk, unsigned short snum)
8218 union sctp_addr addr;
8219 struct sctp_af *af = sctp_sk(sk)->pf->af;
8221 /* Set up a dummy address struct from the sk. */
8222 af->from_sk(&addr, sk);
8223 addr.v4.sin_port = htons(snum);
8225 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8226 return sctp_get_port_local(sk, &addr);
8230 * Move a socket to LISTENING state.
8232 static int sctp_listen_start(struct sock *sk, int backlog)
8234 struct sctp_sock *sp = sctp_sk(sk);
8235 struct sctp_endpoint *ep = sp->ep;
8236 struct crypto_shash *tfm = NULL;
8239 /* Allocate HMAC for generating cookie. */
8240 if (!sp->hmac && sp->sctp_hmac_alg) {
8241 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8242 tfm = crypto_alloc_shash(alg, 0, 0);
8244 net_info_ratelimited("failed to load transform for %s: %ld\n",
8245 sp->sctp_hmac_alg, PTR_ERR(tfm));
8248 sctp_sk(sk)->hmac = tfm;
8252 * If a bind() or sctp_bindx() is not called prior to a listen()
8253 * call that allows new associations to be accepted, the system
8254 * picks an ephemeral port and will choose an address set equivalent
8255 * to binding with a wildcard address.
8257 * This is not currently spelled out in the SCTP sockets
8258 * extensions draft, but follows the practice as seen in TCP
8262 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8263 if (!ep->base.bind_addr.port) {
8264 if (sctp_autobind(sk))
8267 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8268 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8273 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8274 return sctp_hash_endpoint(ep);
8278 * 4.1.3 / 5.1.3 listen()
8280 * By default, new associations are not accepted for UDP style sockets.
8281 * An application uses listen() to mark a socket as being able to
8282 * accept new associations.
8284 * On TCP style sockets, applications use listen() to ready the SCTP
8285 * endpoint for accepting inbound associations.
8287 * On both types of endpoints a backlog of '0' disables listening.
8289 * Move a socket to LISTENING state.
8291 int sctp_inet_listen(struct socket *sock, int backlog)
8293 struct sock *sk = sock->sk;
8294 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8297 if (unlikely(backlog < 0))
8302 /* Peeled-off sockets are not allowed to listen(). */
8303 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8306 if (sock->state != SS_UNCONNECTED)
8309 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8312 /* If backlog is zero, disable listening. */
8314 if (sctp_sstate(sk, CLOSED))
8318 sctp_unhash_endpoint(ep);
8319 sk->sk_state = SCTP_SS_CLOSED;
8320 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8321 sctp_sk(sk)->bind_hash->fastreuse = 1;
8325 /* If we are already listening, just update the backlog */
8326 if (sctp_sstate(sk, LISTENING))
8327 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8329 err = sctp_listen_start(sk, backlog);
8341 * This function is done by modeling the current datagram_poll() and the
8342 * tcp_poll(). Note that, based on these implementations, we don't
8343 * lock the socket in this function, even though it seems that,
8344 * ideally, locking or some other mechanisms can be used to ensure
8345 * the integrity of the counters (sndbuf and wmem_alloc) used
8346 * in this place. We assume that we don't need locks either until proven
8349 * Another thing to note is that we include the Async I/O support
8350 * here, again, by modeling the current TCP/UDP code. We don't have
8351 * a good way to test with it yet.
8353 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8355 struct sock *sk = sock->sk;
8356 struct sctp_sock *sp = sctp_sk(sk);
8359 poll_wait(file, sk_sleep(sk), wait);
8361 sock_rps_record_flow(sk);
8363 /* A TCP-style listening socket becomes readable when the accept queue
8366 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8367 return (!list_empty(&sp->ep->asocs)) ?
8368 (EPOLLIN | EPOLLRDNORM) : 0;
8372 /* Is there any exceptional events? */
8373 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8375 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8376 if (sk->sk_shutdown & RCV_SHUTDOWN)
8377 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8378 if (sk->sk_shutdown == SHUTDOWN_MASK)
8381 /* Is it readable? Reconsider this code with TCP-style support. */
8382 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8383 mask |= EPOLLIN | EPOLLRDNORM;
8385 /* The association is either gone or not ready. */
8386 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8389 /* Is it writable? */
8390 if (sctp_writeable(sk)) {
8391 mask |= EPOLLOUT | EPOLLWRNORM;
8393 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8395 * Since the socket is not locked, the buffer
8396 * might be made available after the writeable check and
8397 * before the bit is set. This could cause a lost I/O
8398 * signal. tcp_poll() has a race breaker for this race
8399 * condition. Based on their implementation, we put
8400 * in the following code to cover it as well.
8402 if (sctp_writeable(sk))
8403 mask |= EPOLLOUT | EPOLLWRNORM;
8408 /********************************************************************
8409 * 2nd Level Abstractions
8410 ********************************************************************/
8412 static struct sctp_bind_bucket *sctp_bucket_create(
8413 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8415 struct sctp_bind_bucket *pp;
8417 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8419 SCTP_DBG_OBJCNT_INC(bind_bucket);
8422 INIT_HLIST_HEAD(&pp->owner);
8424 hlist_add_head(&pp->node, &head->chain);
8429 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8430 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8432 if (pp && hlist_empty(&pp->owner)) {
8433 __hlist_del(&pp->node);
8434 kmem_cache_free(sctp_bucket_cachep, pp);
8435 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8439 /* Release this socket's reference to a local port. */
8440 static inline void __sctp_put_port(struct sock *sk)
8442 struct sctp_bind_hashbucket *head =
8443 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8444 inet_sk(sk)->inet_num)];
8445 struct sctp_bind_bucket *pp;
8447 spin_lock(&head->lock);
8448 pp = sctp_sk(sk)->bind_hash;
8449 __sk_del_bind_node(sk);
8450 sctp_sk(sk)->bind_hash = NULL;
8451 inet_sk(sk)->inet_num = 0;
8452 sctp_bucket_destroy(pp);
8453 spin_unlock(&head->lock);
8456 void sctp_put_port(struct sock *sk)
8459 __sctp_put_port(sk);
8464 * The system picks an ephemeral port and choose an address set equivalent
8465 * to binding with a wildcard address.
8466 * One of those addresses will be the primary address for the association.
8467 * This automatically enables the multihoming capability of SCTP.
8469 static int sctp_autobind(struct sock *sk)
8471 union sctp_addr autoaddr;
8475 /* Initialize a local sockaddr structure to INADDR_ANY. */
8476 af = sctp_sk(sk)->pf->af;
8478 port = htons(inet_sk(sk)->inet_num);
8479 af->inaddr_any(&autoaddr, port);
8481 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8484 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8487 * 4.2 The cmsghdr Structure *
8489 * When ancillary data is sent or received, any number of ancillary data
8490 * objects can be specified by the msg_control and msg_controllen members of
8491 * the msghdr structure, because each object is preceded by
8492 * a cmsghdr structure defining the object's length (the cmsg_len member).
8493 * Historically Berkeley-derived implementations have passed only one object
8494 * at a time, but this API allows multiple objects to be
8495 * passed in a single call to sendmsg() or recvmsg(). The following example
8496 * shows two ancillary data objects in a control buffer.
8498 * |<--------------------------- msg_controllen -------------------------->|
8501 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8503 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8506 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8508 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8511 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8512 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8514 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8516 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8523 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8525 struct msghdr *my_msg = (struct msghdr *)msg;
8526 struct cmsghdr *cmsg;
8528 for_each_cmsghdr(cmsg, my_msg) {
8529 if (!CMSG_OK(my_msg, cmsg))
8532 /* Should we parse this header or ignore? */
8533 if (cmsg->cmsg_level != IPPROTO_SCTP)
8536 /* Strictly check lengths following example in SCM code. */
8537 switch (cmsg->cmsg_type) {
8539 /* SCTP Socket API Extension
8540 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8542 * This cmsghdr structure provides information for
8543 * initializing new SCTP associations with sendmsg().
8544 * The SCTP_INITMSG socket option uses this same data
8545 * structure. This structure is not used for
8548 * cmsg_level cmsg_type cmsg_data[]
8549 * ------------ ------------ ----------------------
8550 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8552 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8555 cmsgs->init = CMSG_DATA(cmsg);
8559 /* SCTP Socket API Extension
8560 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8562 * This cmsghdr structure specifies SCTP options for
8563 * sendmsg() and describes SCTP header information
8564 * about a received message through recvmsg().
8566 * cmsg_level cmsg_type cmsg_data[]
8567 * ------------ ------------ ----------------------
8568 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8570 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8573 cmsgs->srinfo = CMSG_DATA(cmsg);
8575 if (cmsgs->srinfo->sinfo_flags &
8576 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8577 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8578 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8583 /* SCTP Socket API Extension
8584 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8586 * This cmsghdr structure specifies SCTP options for
8587 * sendmsg(). This structure and SCTP_RCVINFO replaces
8588 * SCTP_SNDRCV which has been deprecated.
8590 * cmsg_level cmsg_type cmsg_data[]
8591 * ------------ ------------ ---------------------
8592 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8594 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8597 cmsgs->sinfo = CMSG_DATA(cmsg);
8599 if (cmsgs->sinfo->snd_flags &
8600 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8601 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8602 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8606 /* SCTP Socket API Extension
8607 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8609 * This cmsghdr structure specifies SCTP options for sendmsg().
8611 * cmsg_level cmsg_type cmsg_data[]
8612 * ------------ ------------ ---------------------
8613 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8615 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8618 cmsgs->prinfo = CMSG_DATA(cmsg);
8619 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8622 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8623 cmsgs->prinfo->pr_value = 0;
8626 /* SCTP Socket API Extension
8627 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8629 * This cmsghdr structure specifies SCTP options for sendmsg().
8631 * cmsg_level cmsg_type cmsg_data[]
8632 * ------------ ------------ ---------------------
8633 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8635 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8638 cmsgs->authinfo = CMSG_DATA(cmsg);
8640 case SCTP_DSTADDRV4:
8641 case SCTP_DSTADDRV6:
8642 /* SCTP Socket API Extension
8643 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8645 * This cmsghdr structure specifies SCTP options for sendmsg().
8647 * cmsg_level cmsg_type cmsg_data[]
8648 * ------------ ------------ ---------------------
8649 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8650 * ------------ ------------ ---------------------
8651 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8653 cmsgs->addrs_msg = my_msg;
8664 * Wait for a packet..
8665 * Note: This function is the same function as in core/datagram.c
8666 * with a few modifications to make lksctp work.
8668 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8673 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8675 /* Socket errors? */
8676 error = sock_error(sk);
8680 if (!skb_queue_empty(&sk->sk_receive_queue))
8683 /* Socket shut down? */
8684 if (sk->sk_shutdown & RCV_SHUTDOWN)
8687 /* Sequenced packets can come disconnected. If so we report the
8692 /* Is there a good reason to think that we may receive some data? */
8693 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8696 /* Handle signals. */
8697 if (signal_pending(current))
8700 /* Let another process have a go. Since we are going to sleep
8701 * anyway. Note: This may cause odd behaviors if the message
8702 * does not fit in the user's buffer, but this seems to be the
8703 * only way to honor MSG_DONTWAIT realistically.
8706 *timeo_p = schedule_timeout(*timeo_p);
8710 finish_wait(sk_sleep(sk), &wait);
8714 error = sock_intr_errno(*timeo_p);
8717 finish_wait(sk_sleep(sk), &wait);
8722 /* Receive a datagram.
8723 * Note: This is pretty much the same routine as in core/datagram.c
8724 * with a few changes to make lksctp work.
8726 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8727 int noblock, int *err)
8730 struct sk_buff *skb;
8733 timeo = sock_rcvtimeo(sk, noblock);
8735 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8736 MAX_SCHEDULE_TIMEOUT);
8739 /* Again only user level code calls this function,
8740 * so nothing interrupt level
8741 * will suddenly eat the receive_queue.
8743 * Look at current nfs client by the way...
8744 * However, this function was correct in any case. 8)
8746 if (flags & MSG_PEEK) {
8747 skb = skb_peek(&sk->sk_receive_queue);
8749 refcount_inc(&skb->users);
8751 skb = __skb_dequeue(&sk->sk_receive_queue);
8757 /* Caller is allowed not to check sk->sk_err before calling. */
8758 error = sock_error(sk);
8762 if (sk->sk_shutdown & RCV_SHUTDOWN)
8765 if (sk_can_busy_loop(sk)) {
8766 sk_busy_loop(sk, noblock);
8768 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8772 /* User doesn't want to wait. */
8776 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8785 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8786 static void __sctp_write_space(struct sctp_association *asoc)
8788 struct sock *sk = asoc->base.sk;
8790 if (sctp_wspace(asoc) <= 0)
8793 if (waitqueue_active(&asoc->wait))
8794 wake_up_interruptible(&asoc->wait);
8796 if (sctp_writeable(sk)) {
8797 struct socket_wq *wq;
8800 wq = rcu_dereference(sk->sk_wq);
8802 if (waitqueue_active(&wq->wait))
8803 wake_up_interruptible(&wq->wait);
8805 /* Note that we try to include the Async I/O support
8806 * here by modeling from the current TCP/UDP code.
8807 * We have not tested with it yet.
8809 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8810 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8816 static void sctp_wake_up_waiters(struct sock *sk,
8817 struct sctp_association *asoc)
8819 struct sctp_association *tmp = asoc;
8821 /* We do accounting for the sndbuf space per association,
8822 * so we only need to wake our own association.
8824 if (asoc->ep->sndbuf_policy)
8825 return __sctp_write_space(asoc);
8827 /* If association goes down and is just flushing its
8828 * outq, then just normally notify others.
8830 if (asoc->base.dead)
8831 return sctp_write_space(sk);
8833 /* Accounting for the sndbuf space is per socket, so we
8834 * need to wake up others, try to be fair and in case of
8835 * other associations, let them have a go first instead
8836 * of just doing a sctp_write_space() call.
8838 * Note that we reach sctp_wake_up_waiters() only when
8839 * associations free up queued chunks, thus we are under
8840 * lock and the list of associations on a socket is
8841 * guaranteed not to change.
8843 for (tmp = list_next_entry(tmp, asocs); 1;
8844 tmp = list_next_entry(tmp, asocs)) {
8845 /* Manually skip the head element. */
8846 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8848 /* Wake up association. */
8849 __sctp_write_space(tmp);
8850 /* We've reached the end. */
8856 /* Do accounting for the sndbuf space.
8857 * Decrement the used sndbuf space of the corresponding association by the
8858 * data size which was just transmitted(freed).
8860 static void sctp_wfree(struct sk_buff *skb)
8862 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8863 struct sctp_association *asoc = chunk->asoc;
8864 struct sock *sk = asoc->base.sk;
8866 sk_mem_uncharge(sk, skb->truesize);
8867 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8868 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8869 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8870 &sk->sk_wmem_alloc));
8873 struct sctp_shared_key *shkey = chunk->shkey;
8875 /* refcnt == 2 and !list_empty mean after this release, it's
8876 * not being used anywhere, and it's time to notify userland
8877 * that this shkey can be freed if it's been deactivated.
8879 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8880 refcount_read(&shkey->refcnt) == 2) {
8881 struct sctp_ulpevent *ev;
8883 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8887 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8889 sctp_auth_shkey_release(chunk->shkey);
8893 sctp_wake_up_waiters(sk, asoc);
8895 sctp_association_put(asoc);
8898 /* Do accounting for the receive space on the socket.
8899 * Accounting for the association is done in ulpevent.c
8900 * We set this as a destructor for the cloned data skbs so that
8901 * accounting is done at the correct time.
8903 void sctp_sock_rfree(struct sk_buff *skb)
8905 struct sock *sk = skb->sk;
8906 struct sctp_ulpevent *event = sctp_skb2event(skb);
8908 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8911 * Mimic the behavior of sock_rfree
8913 sk_mem_uncharge(sk, event->rmem_len);
8917 /* Helper function to wait for space in the sndbuf. */
8918 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8921 struct sock *sk = asoc->base.sk;
8922 long current_timeo = *timeo_p;
8926 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8929 /* Increment the association's refcnt. */
8930 sctp_association_hold(asoc);
8932 /* Wait on the association specific sndbuf space. */
8934 prepare_to_wait_exclusive(&asoc->wait, &wait,
8935 TASK_INTERRUPTIBLE);
8936 if (asoc->base.dead)
8940 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8942 if (signal_pending(current))
8943 goto do_interrupted;
8944 if (sk_under_memory_pressure(sk))
8946 if ((int)msg_len <= sctp_wspace(asoc) &&
8947 sk_wmem_schedule(sk, msg_len))
8950 /* Let another process have a go. Since we are going
8954 current_timeo = schedule_timeout(current_timeo);
8956 if (sk != asoc->base.sk)
8959 *timeo_p = current_timeo;
8963 finish_wait(&asoc->wait, &wait);
8965 /* Release the association's refcnt. */
8966 sctp_association_put(asoc);
8979 err = sock_intr_errno(*timeo_p);
8987 void sctp_data_ready(struct sock *sk)
8989 struct socket_wq *wq;
8992 wq = rcu_dereference(sk->sk_wq);
8993 if (skwq_has_sleeper(wq))
8994 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8995 EPOLLRDNORM | EPOLLRDBAND);
8996 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9000 /* If socket sndbuf has changed, wake up all per association waiters. */
9001 void sctp_write_space(struct sock *sk)
9003 struct sctp_association *asoc;
9005 /* Wake up the tasks in each wait queue. */
9006 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9007 __sctp_write_space(asoc);
9011 /* Is there any sndbuf space available on the socket?
9013 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9014 * associations on the same socket. For a UDP-style socket with
9015 * multiple associations, it is possible for it to be "unwriteable"
9016 * prematurely. I assume that this is acceptable because
9017 * a premature "unwriteable" is better than an accidental "writeable" which
9018 * would cause an unwanted block under certain circumstances. For the 1-1
9019 * UDP-style sockets or TCP-style sockets, this code should work.
9022 static bool sctp_writeable(struct sock *sk)
9024 return sk->sk_sndbuf > sk->sk_wmem_queued;
9027 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9028 * returns immediately with EINPROGRESS.
9030 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9032 struct sock *sk = asoc->base.sk;
9034 long current_timeo = *timeo_p;
9037 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9039 /* Increment the association's refcnt. */
9040 sctp_association_hold(asoc);
9043 prepare_to_wait_exclusive(&asoc->wait, &wait,
9044 TASK_INTERRUPTIBLE);
9047 if (sk->sk_shutdown & RCV_SHUTDOWN)
9049 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9052 if (signal_pending(current))
9053 goto do_interrupted;
9055 if (sctp_state(asoc, ESTABLISHED))
9058 /* Let another process have a go. Since we are going
9062 current_timeo = schedule_timeout(current_timeo);
9065 *timeo_p = current_timeo;
9069 finish_wait(&asoc->wait, &wait);
9071 /* Release the association's refcnt. */
9072 sctp_association_put(asoc);
9077 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9080 err = -ECONNREFUSED;
9084 err = sock_intr_errno(*timeo_p);
9092 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9094 struct sctp_endpoint *ep;
9098 ep = sctp_sk(sk)->ep;
9102 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9103 TASK_INTERRUPTIBLE);
9105 if (list_empty(&ep->asocs)) {
9107 timeo = schedule_timeout(timeo);
9112 if (!sctp_sstate(sk, LISTENING))
9116 if (!list_empty(&ep->asocs))
9119 err = sock_intr_errno(timeo);
9120 if (signal_pending(current))
9128 finish_wait(sk_sleep(sk), &wait);
9133 static void sctp_wait_for_close(struct sock *sk, long timeout)
9138 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9139 if (list_empty(&sctp_sk(sk)->ep->asocs))
9142 timeout = schedule_timeout(timeout);
9144 } while (!signal_pending(current) && timeout);
9146 finish_wait(sk_sleep(sk), &wait);
9149 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9151 struct sk_buff *frag;
9156 /* Don't forget the fragments. */
9157 skb_walk_frags(skb, frag)
9158 sctp_skb_set_owner_r_frag(frag, sk);
9161 sctp_skb_set_owner_r(skb, sk);
9164 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9165 struct sctp_association *asoc)
9167 struct inet_sock *inet = inet_sk(sk);
9168 struct inet_sock *newinet;
9169 struct sctp_sock *sp = sctp_sk(sk);
9170 struct sctp_endpoint *ep = sp->ep;
9172 newsk->sk_type = sk->sk_type;
9173 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9174 newsk->sk_flags = sk->sk_flags;
9175 newsk->sk_tsflags = sk->sk_tsflags;
9176 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9177 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9178 newsk->sk_reuse = sk->sk_reuse;
9179 sctp_sk(newsk)->reuse = sp->reuse;
9181 newsk->sk_shutdown = sk->sk_shutdown;
9182 newsk->sk_destruct = sctp_destruct_sock;
9183 newsk->sk_family = sk->sk_family;
9184 newsk->sk_protocol = IPPROTO_SCTP;
9185 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9186 newsk->sk_sndbuf = sk->sk_sndbuf;
9187 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9188 newsk->sk_lingertime = sk->sk_lingertime;
9189 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9190 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9191 newsk->sk_rxhash = sk->sk_rxhash;
9193 newinet = inet_sk(newsk);
9195 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9196 * getsockname() and getpeername()
9198 newinet->inet_sport = inet->inet_sport;
9199 newinet->inet_saddr = inet->inet_saddr;
9200 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9201 newinet->inet_dport = htons(asoc->peer.port);
9202 newinet->pmtudisc = inet->pmtudisc;
9203 newinet->inet_id = prandom_u32();
9205 newinet->uc_ttl = inet->uc_ttl;
9206 newinet->mc_loop = 1;
9207 newinet->mc_ttl = 1;
9208 newinet->mc_index = 0;
9209 newinet->mc_list = NULL;
9211 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9212 net_enable_timestamp();
9214 /* Set newsk security attributes from orginal sk and connection
9215 * security attribute from ep.
9217 security_sctp_sk_clone(ep, sk, newsk);
9220 static inline void sctp_copy_descendant(struct sock *sk_to,
9221 const struct sock *sk_from)
9223 size_t ancestor_size = sizeof(struct inet_sock);
9225 ancestor_size += sk_from->sk_prot->obj_size;
9226 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9227 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9230 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9231 * and its messages to the newsk.
9233 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9234 struct sctp_association *assoc,
9235 enum sctp_socket_type type)
9237 struct sctp_sock *oldsp = sctp_sk(oldsk);
9238 struct sctp_sock *newsp = sctp_sk(newsk);
9239 struct sctp_bind_bucket *pp; /* hash list port iterator */
9240 struct sctp_endpoint *newep = newsp->ep;
9241 struct sk_buff *skb, *tmp;
9242 struct sctp_ulpevent *event;
9243 struct sctp_bind_hashbucket *head;
9246 /* Migrate socket buffer sizes and all the socket level options to the
9249 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9250 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9251 /* Brute force copy old sctp opt. */
9252 sctp_copy_descendant(newsk, oldsk);
9254 /* Restore the ep value that was overwritten with the above structure
9260 /* Hook this new socket in to the bind_hash list. */
9261 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9262 inet_sk(oldsk)->inet_num)];
9263 spin_lock_bh(&head->lock);
9264 pp = sctp_sk(oldsk)->bind_hash;
9265 sk_add_bind_node(newsk, &pp->owner);
9266 sctp_sk(newsk)->bind_hash = pp;
9267 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9268 spin_unlock_bh(&head->lock);
9270 /* Copy the bind_addr list from the original endpoint to the new
9271 * endpoint so that we can handle restarts properly
9273 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9274 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9278 /* New ep's auth_hmacs should be set if old ep's is set, in case
9279 * that net->sctp.auth_enable has been changed to 0 by users and
9280 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9282 if (oldsp->ep->auth_hmacs) {
9283 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9288 /* Move any messages in the old socket's receive queue that are for the
9289 * peeled off association to the new socket's receive queue.
9291 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9292 event = sctp_skb2event(skb);
9293 if (event->asoc == assoc) {
9294 __skb_unlink(skb, &oldsk->sk_receive_queue);
9295 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9296 sctp_skb_set_owner_r_frag(skb, newsk);
9300 /* Clean up any messages pending delivery due to partial
9301 * delivery. Three cases:
9302 * 1) No partial deliver; no work.
9303 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9304 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9306 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9308 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9309 struct sk_buff_head *queue;
9311 /* Decide which queue to move pd_lobby skbs to. */
9312 if (assoc->ulpq.pd_mode) {
9313 queue = &newsp->pd_lobby;
9315 queue = &newsk->sk_receive_queue;
9317 /* Walk through the pd_lobby, looking for skbs that
9318 * need moved to the new socket.
9320 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9321 event = sctp_skb2event(skb);
9322 if (event->asoc == assoc) {
9323 __skb_unlink(skb, &oldsp->pd_lobby);
9324 __skb_queue_tail(queue, skb);
9325 sctp_skb_set_owner_r_frag(skb, newsk);
9329 /* Clear up any skbs waiting for the partial
9330 * delivery to finish.
9332 if (assoc->ulpq.pd_mode)
9333 sctp_clear_pd(oldsk, NULL);
9337 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9339 /* Set the type of socket to indicate that it is peeled off from the
9340 * original UDP-style socket or created with the accept() call on a
9341 * TCP-style socket..
9345 /* Mark the new socket "in-use" by the user so that any packets
9346 * that may arrive on the association after we've moved it are
9347 * queued to the backlog. This prevents a potential race between
9348 * backlog processing on the old socket and new-packet processing
9349 * on the new socket.
9351 * The caller has just allocated newsk so we can guarantee that other
9352 * paths won't try to lock it and then oldsk.
9354 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9355 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9356 sctp_assoc_migrate(assoc, newsk);
9357 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9359 /* If the association on the newsk is already closed before accept()
9360 * is called, set RCV_SHUTDOWN flag.
9362 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9363 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9364 newsk->sk_shutdown |= RCV_SHUTDOWN;
9366 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9369 release_sock(newsk);
9375 /* This proto struct describes the ULP interface for SCTP. */
9376 struct proto sctp_prot = {
9378 .owner = THIS_MODULE,
9379 .close = sctp_close,
9380 .disconnect = sctp_disconnect,
9381 .accept = sctp_accept,
9382 .ioctl = sctp_ioctl,
9383 .init = sctp_init_sock,
9384 .destroy = sctp_destroy_sock,
9385 .shutdown = sctp_shutdown,
9386 .setsockopt = sctp_setsockopt,
9387 .getsockopt = sctp_getsockopt,
9388 .sendmsg = sctp_sendmsg,
9389 .recvmsg = sctp_recvmsg,
9391 .bind_add = sctp_bind_add,
9392 .backlog_rcv = sctp_backlog_rcv,
9394 .unhash = sctp_unhash,
9395 .no_autobind = true,
9396 .obj_size = sizeof(struct sctp_sock),
9397 .useroffset = offsetof(struct sctp_sock, subscribe),
9398 .usersize = offsetof(struct sctp_sock, initmsg) -
9399 offsetof(struct sctp_sock, subscribe) +
9400 sizeof_field(struct sctp_sock, initmsg),
9401 .sysctl_mem = sysctl_sctp_mem,
9402 .sysctl_rmem = sysctl_sctp_rmem,
9403 .sysctl_wmem = sysctl_sctp_wmem,
9404 .memory_pressure = &sctp_memory_pressure,
9405 .enter_memory_pressure = sctp_enter_memory_pressure,
9406 .memory_allocated = &sctp_memory_allocated,
9407 .sockets_allocated = &sctp_sockets_allocated,
9410 #if IS_ENABLED(CONFIG_IPV6)
9412 #include <net/transp_v6.h>
9413 static void sctp_v6_destroy_sock(struct sock *sk)
9415 sctp_destroy_sock(sk);
9416 inet6_destroy_sock(sk);
9419 struct proto sctpv6_prot = {
9421 .owner = THIS_MODULE,
9422 .close = sctp_close,
9423 .disconnect = sctp_disconnect,
9424 .accept = sctp_accept,
9425 .ioctl = sctp_ioctl,
9426 .init = sctp_init_sock,
9427 .destroy = sctp_v6_destroy_sock,
9428 .shutdown = sctp_shutdown,
9429 .setsockopt = sctp_setsockopt,
9430 .getsockopt = sctp_getsockopt,
9431 .sendmsg = sctp_sendmsg,
9432 .recvmsg = sctp_recvmsg,
9434 .bind_add = sctp_bind_add,
9435 .backlog_rcv = sctp_backlog_rcv,
9437 .unhash = sctp_unhash,
9438 .no_autobind = true,
9439 .obj_size = sizeof(struct sctp6_sock),
9440 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9441 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9442 offsetof(struct sctp6_sock, sctp.subscribe) +
9443 sizeof_field(struct sctp6_sock, sctp.initmsg),
9444 .sysctl_mem = sysctl_sctp_mem,
9445 .sysctl_rmem = sysctl_sctp_rmem,
9446 .sysctl_wmem = sysctl_sctp_wmem,
9447 .memory_pressure = &sctp_memory_pressure,
9448 .enter_memory_pressure = sctp_enter_memory_pressure,
9449 .memory_allocated = &sctp_memory_allocated,
9450 .sockets_allocated = &sctp_sockets_allocated,
9452 #endif /* IS_ENABLED(CONFIG_IPV6) */