1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
10 * This file is part of the SCTP kernel implementation
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
19 * Please send any bug reports or fixes you make to the
21 * lksctp developers <linux-sctp@vger.kernel.org>
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
58 #include <net/route.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
63 #include <linux/socket.h> /* for sa_family_t */
64 #include <linux/export.h>
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
68 #include <net/sctp/stream_sched.h>
70 /* Forward declarations for internal helper functions. */
71 static bool sctp_writeable(struct sock *sk);
72 static void sctp_wfree(struct sk_buff *skb);
73 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
75 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
76 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
77 static int sctp_wait_for_accept(struct sock *sk, long timeo);
78 static void sctp_wait_for_close(struct sock *sk, long timeo);
79 static void sctp_destruct_sock(struct sock *sk);
80 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
81 union sctp_addr *addr, int len);
82 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
83 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
84 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
85 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf(struct sctp_association *asoc,
87 struct sctp_chunk *chunk);
88 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
89 static int sctp_autobind(struct sock *sk);
90 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
91 struct sctp_association *assoc,
92 enum sctp_socket_type type);
94 static unsigned long sctp_memory_pressure;
95 static atomic_long_t sctp_memory_allocated;
96 struct percpu_counter sctp_sockets_allocated;
98 static void sctp_enter_memory_pressure(struct sock *sk)
100 sctp_memory_pressure = 1;
104 /* Get the sndbuf space available at the time on the association. */
105 static inline int sctp_wspace(struct sctp_association *asoc)
107 struct sock *sk = asoc->base.sk;
109 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
110 : sk_stream_wspace(sk);
113 /* Increment the used sndbuf space count of the corresponding association by
114 * the size of the outgoing data chunk.
115 * Also, set the skb destructor for sndbuf accounting later.
117 * Since it is always 1-1 between chunk and skb, and also a new skb is always
118 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
119 * destructor in the data chunk skb for the purpose of the sndbuf space
122 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
124 struct sctp_association *asoc = chunk->asoc;
125 struct sock *sk = asoc->base.sk;
127 /* The sndbuf space is tracked per association. */
128 sctp_association_hold(asoc);
131 sctp_auth_shkey_hold(chunk->shkey);
133 skb_set_owner_w(chunk->skb, sk);
135 chunk->skb->destructor = sctp_wfree;
136 /* Save the chunk pointer in skb for sctp_wfree to use later. */
137 skb_shinfo(chunk->skb)->destructor_arg = chunk;
139 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
140 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
141 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
142 sk_mem_charge(sk, chunk->skb->truesize);
145 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
147 skb_orphan(chunk->skb);
150 #define traverse_and_process() \
153 if (msg == prev_msg) \
155 list_for_each_entry(c, &msg->chunks, frag_list) { \
156 if ((clear && asoc->base.sk == c->skb->sk) || \
157 (!clear && asoc->base.sk != c->skb->sk)) \
163 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
165 void (*cb)(struct sctp_chunk *))
168 struct sctp_datamsg *msg, *prev_msg = NULL;
169 struct sctp_outq *q = &asoc->outqueue;
170 struct sctp_chunk *chunk, *c;
171 struct sctp_transport *t;
173 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
175 traverse_and_process();
177 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
178 traverse_and_process();
180 list_for_each_entry(chunk, &q->sacked, transmitted_list)
181 traverse_and_process();
183 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
184 traverse_and_process();
186 list_for_each_entry(chunk, &q->out_chunk_list, list)
187 traverse_and_process();
190 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
191 void (*cb)(struct sk_buff *, struct sock *))
194 struct sk_buff *skb, *tmp;
196 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
199 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
202 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206 /* Verify that this is a valid address. */
207 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
212 /* Verify basic sockaddr. */
213 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217 /* Is this a valid SCTP address? */
218 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
221 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
227 /* Look up the association by its id. If this is not a UDP-style
228 * socket, the ID field is always ignored.
230 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
232 struct sctp_association *asoc = NULL;
234 /* If this is not a UDP-style socket, assoc id should be ignored. */
235 if (!sctp_style(sk, UDP)) {
236 /* Return NULL if the socket state is not ESTABLISHED. It
237 * could be a TCP-style listening socket or a socket which
238 * hasn't yet called connect() to establish an association.
240 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
243 /* Get the first and the only association from the list. */
244 if (!list_empty(&sctp_sk(sk)->ep->asocs))
245 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
246 struct sctp_association, asocs);
250 /* Otherwise this is a UDP-style socket. */
251 if (id <= SCTP_ALL_ASSOC)
254 spin_lock_bh(&sctp_assocs_id_lock);
255 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
256 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
258 spin_unlock_bh(&sctp_assocs_id_lock);
263 /* Look up the transport from an address and an assoc id. If both address and
264 * id are specified, the associations matching the address and the id should be
267 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
268 struct sockaddr_storage *addr,
271 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
272 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
273 union sctp_addr *laddr = (union sctp_addr *)addr;
274 struct sctp_transport *transport;
276 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
279 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
286 id_asoc = sctp_id2assoc(sk, id);
287 if (id_asoc && (id_asoc != addr_asoc))
290 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
291 (union sctp_addr *)addr);
296 /* API 3.1.2 bind() - UDP Style Syntax
297 * The syntax of bind() is,
299 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
301 * sd - the socket descriptor returned by socket().
302 * addr - the address structure (struct sockaddr_in or struct
303 * sockaddr_in6 [RFC 2553]),
304 * addr_len - the size of the address structure.
306 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
312 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
315 /* Disallow binding twice. */
316 if (!sctp_sk(sk)->ep->base.bind_addr.port)
317 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
327 static int sctp_get_port_local(struct sock *, union sctp_addr *);
329 /* Verify this is a valid sockaddr. */
330 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
331 union sctp_addr *addr, int len)
335 /* Check minimum size. */
336 if (len < sizeof (struct sockaddr))
339 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
342 if (addr->sa.sa_family == AF_INET6) {
343 if (len < SIN6_LEN_RFC2133)
345 /* V4 mapped address are really of AF_INET family */
346 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
347 !opt->pf->af_supported(AF_INET, opt))
351 /* If we get this far, af is valid. */
352 af = sctp_get_af_specific(addr->sa.sa_family);
354 if (len < af->sockaddr_len)
360 /* Bind a local address either to an endpoint or to an association. */
361 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
363 struct net *net = sock_net(sk);
364 struct sctp_sock *sp = sctp_sk(sk);
365 struct sctp_endpoint *ep = sp->ep;
366 struct sctp_bind_addr *bp = &ep->base.bind_addr;
371 /* Common sockaddr verification. */
372 af = sctp_sockaddr_af(sp, addr, len);
374 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
375 __func__, sk, addr, len);
379 snum = ntohs(addr->v4.sin_port);
381 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
382 __func__, sk, &addr->sa, bp->port, snum, len);
384 /* PF specific bind() address verification. */
385 if (!sp->pf->bind_verify(sp, addr))
386 return -EADDRNOTAVAIL;
388 /* We must either be unbound, or bind to the same port.
389 * It's OK to allow 0 ports if we are already bound.
390 * We'll just inhert an already bound port in this case
395 else if (snum != bp->port) {
396 pr_debug("%s: new port %d doesn't match existing port "
397 "%d\n", __func__, snum, bp->port);
402 if (snum && inet_port_requires_bind_service(net, snum) &&
403 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
406 /* See if the address matches any of the addresses we may have
407 * already bound before checking against other endpoints.
409 if (sctp_bind_addr_match(bp, addr, sp))
412 /* Make sure we are allowed to bind here.
413 * The function sctp_get_port_local() does duplicate address
416 addr->v4.sin_port = htons(snum);
417 if (sctp_get_port_local(sk, addr))
420 /* Refresh ephemeral port. */
422 bp->port = inet_sk(sk)->inet_num;
424 /* Add the address to the bind address list.
425 * Use GFP_ATOMIC since BHs will be disabled.
427 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
428 SCTP_ADDR_SRC, GFP_ATOMIC);
434 /* Copy back into socket for getsockname() use. */
435 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
436 sp->pf->to_sk_saddr(addr, sk);
441 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
443 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
444 * at any one time. If a sender, after sending an ASCONF chunk, decides
445 * it needs to transfer another ASCONF Chunk, it MUST wait until the
446 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
447 * subsequent ASCONF. Note this restriction binds each side, so at any
448 * time two ASCONF may be in-transit on any given association (one sent
449 * from each endpoint).
451 static int sctp_send_asconf(struct sctp_association *asoc,
452 struct sctp_chunk *chunk)
456 /* If there is an outstanding ASCONF chunk, queue it for later
459 if (asoc->addip_last_asconf) {
460 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
464 /* Hold the chunk until an ASCONF_ACK is received. */
465 sctp_chunk_hold(chunk);
466 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
468 sctp_chunk_free(chunk);
470 asoc->addip_last_asconf = chunk;
476 /* Add a list of addresses as bind addresses to local endpoint or
479 * Basically run through each address specified in the addrs/addrcnt
480 * array/length pair, determine if it is IPv6 or IPv4 and call
481 * sctp_do_bind() on it.
483 * If any of them fails, then the operation will be reversed and the
484 * ones that were added will be removed.
486 * Only sctp_setsockopt_bindx() is supposed to call this function.
488 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
493 struct sockaddr *sa_addr;
496 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
500 for (cnt = 0; cnt < addrcnt; cnt++) {
501 /* The list may contain either IPv4 or IPv6 address;
502 * determine the address length for walking thru the list.
505 af = sctp_get_af_specific(sa_addr->sa_family);
511 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
514 addr_buf += af->sockaddr_len;
518 /* Failed. Cleanup the ones that have been added */
520 sctp_bindx_rem(sk, addrs, cnt);
528 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
529 * associations that are part of the endpoint indicating that a list of local
530 * addresses are added to the endpoint.
532 * If any of the addresses is already in the bind address list of the
533 * association, we do not send the chunk for that association. But it will not
534 * affect other associations.
536 * Only sctp_setsockopt_bindx() is supposed to call this function.
538 static int sctp_send_asconf_add_ip(struct sock *sk,
539 struct sockaddr *addrs,
542 struct sctp_sock *sp;
543 struct sctp_endpoint *ep;
544 struct sctp_association *asoc;
545 struct sctp_bind_addr *bp;
546 struct sctp_chunk *chunk;
547 struct sctp_sockaddr_entry *laddr;
548 union sctp_addr *addr;
549 union sctp_addr saveaddr;
559 if (!ep->asconf_enable)
562 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
563 __func__, sk, addrs, addrcnt);
565 list_for_each_entry(asoc, &ep->asocs, asocs) {
566 if (!asoc->peer.asconf_capable)
569 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
572 if (!sctp_state(asoc, ESTABLISHED))
575 /* Check if any address in the packed array of addresses is
576 * in the bind address list of the association. If so,
577 * do not send the asconf chunk to its peer, but continue with
578 * other associations.
581 for (i = 0; i < addrcnt; i++) {
583 af = sctp_get_af_specific(addr->v4.sin_family);
589 if (sctp_assoc_lookup_laddr(asoc, addr))
592 addr_buf += af->sockaddr_len;
597 /* Use the first valid address in bind addr list of
598 * association as Address Parameter of ASCONF CHUNK.
600 bp = &asoc->base.bind_addr;
601 p = bp->address_list.next;
602 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
603 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
604 addrcnt, SCTP_PARAM_ADD_IP);
610 /* Add the new addresses to the bind address list with
611 * use_as_src set to 0.
614 for (i = 0; i < addrcnt; i++) {
616 af = sctp_get_af_specific(addr->v4.sin_family);
617 memcpy(&saveaddr, addr, af->sockaddr_len);
618 retval = sctp_add_bind_addr(bp, &saveaddr,
620 SCTP_ADDR_NEW, GFP_ATOMIC);
621 addr_buf += af->sockaddr_len;
623 if (asoc->src_out_of_asoc_ok) {
624 struct sctp_transport *trans;
626 list_for_each_entry(trans,
627 &asoc->peer.transport_addr_list, transports) {
628 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
629 2*asoc->pathmtu, 4380));
630 trans->ssthresh = asoc->peer.i.a_rwnd;
631 trans->rto = asoc->rto_initial;
632 sctp_max_rto(asoc, trans);
633 trans->rtt = trans->srtt = trans->rttvar = 0;
634 /* Clear the source and route cache */
635 sctp_transport_route(trans, NULL,
636 sctp_sk(asoc->base.sk));
639 retval = sctp_send_asconf(asoc, chunk);
646 /* Remove a list of addresses from bind addresses list. Do not remove the
649 * Basically run through each address specified in the addrs/addrcnt
650 * array/length pair, determine if it is IPv6 or IPv4 and call
651 * sctp_del_bind() on it.
653 * If any of them fails, then the operation will be reversed and the
654 * ones that were removed will be added back.
656 * At least one address has to be left; if only one address is
657 * available, the operation will return -EBUSY.
659 * Only sctp_setsockopt_bindx() is supposed to call this function.
661 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
663 struct sctp_sock *sp = sctp_sk(sk);
664 struct sctp_endpoint *ep = sp->ep;
666 struct sctp_bind_addr *bp = &ep->base.bind_addr;
669 union sctp_addr *sa_addr;
672 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
673 __func__, sk, addrs, addrcnt);
676 for (cnt = 0; cnt < addrcnt; cnt++) {
677 /* If the bind address list is empty or if there is only one
678 * bind address, there is nothing more to be removed (we need
679 * at least one address here).
681 if (list_empty(&bp->address_list) ||
682 (sctp_list_single_entry(&bp->address_list))) {
688 af = sctp_get_af_specific(sa_addr->sa.sa_family);
694 if (!af->addr_valid(sa_addr, sp, NULL)) {
695 retval = -EADDRNOTAVAIL;
699 if (sa_addr->v4.sin_port &&
700 sa_addr->v4.sin_port != htons(bp->port)) {
705 if (!sa_addr->v4.sin_port)
706 sa_addr->v4.sin_port = htons(bp->port);
708 /* FIXME - There is probably a need to check if sk->sk_saddr and
709 * sk->sk_rcv_addr are currently set to one of the addresses to
710 * be removed. This is something which needs to be looked into
711 * when we are fixing the outstanding issues with multi-homing
712 * socket routing and failover schemes. Refer to comments in
713 * sctp_do_bind(). -daisy
715 retval = sctp_del_bind_addr(bp, sa_addr);
717 addr_buf += af->sockaddr_len;
720 /* Failed. Add the ones that has been removed back */
722 sctp_bindx_add(sk, addrs, cnt);
730 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
731 * the associations that are part of the endpoint indicating that a list of
732 * local addresses are removed from the endpoint.
734 * If any of the addresses is already in the bind address list of the
735 * association, we do not send the chunk for that association. But it will not
736 * affect other associations.
738 * Only sctp_setsockopt_bindx() is supposed to call this function.
740 static int sctp_send_asconf_del_ip(struct sock *sk,
741 struct sockaddr *addrs,
744 struct sctp_sock *sp;
745 struct sctp_endpoint *ep;
746 struct sctp_association *asoc;
747 struct sctp_transport *transport;
748 struct sctp_bind_addr *bp;
749 struct sctp_chunk *chunk;
750 union sctp_addr *laddr;
753 struct sctp_sockaddr_entry *saddr;
762 if (!ep->asconf_enable)
765 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
766 __func__, sk, addrs, addrcnt);
768 list_for_each_entry(asoc, &ep->asocs, asocs) {
770 if (!asoc->peer.asconf_capable)
773 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776 if (!sctp_state(asoc, ESTABLISHED))
779 /* Check if any address in the packed array of addresses is
780 * not present in the bind address list of the association.
781 * If so, do not send the asconf chunk to its peer, but
782 * continue with other associations.
785 for (i = 0; i < addrcnt; i++) {
787 af = sctp_get_af_specific(laddr->v4.sin_family);
793 if (!sctp_assoc_lookup_laddr(asoc, laddr))
796 addr_buf += af->sockaddr_len;
801 /* Find one address in the association's bind address list
802 * that is not in the packed array of addresses. This is to
803 * make sure that we do not delete all the addresses in the
806 bp = &asoc->base.bind_addr;
807 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
809 if ((laddr == NULL) && (addrcnt == 1)) {
810 if (asoc->asconf_addr_del_pending)
812 asoc->asconf_addr_del_pending =
813 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
814 if (asoc->asconf_addr_del_pending == NULL) {
818 asoc->asconf_addr_del_pending->sa.sa_family =
820 asoc->asconf_addr_del_pending->v4.sin_port =
822 if (addrs->sa_family == AF_INET) {
823 struct sockaddr_in *sin;
825 sin = (struct sockaddr_in *)addrs;
826 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
827 } else if (addrs->sa_family == AF_INET6) {
828 struct sockaddr_in6 *sin6;
830 sin6 = (struct sockaddr_in6 *)addrs;
831 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
835 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
836 asoc->asconf_addr_del_pending);
838 asoc->src_out_of_asoc_ok = 1;
846 /* We do not need RCU protection throughout this loop
847 * because this is done under a socket lock from the
850 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
858 /* Reset use_as_src flag for the addresses in the bind address
859 * list that are to be deleted.
862 for (i = 0; i < addrcnt; i++) {
864 af = sctp_get_af_specific(laddr->v4.sin_family);
865 list_for_each_entry(saddr, &bp->address_list, list) {
866 if (sctp_cmp_addr_exact(&saddr->a, laddr))
867 saddr->state = SCTP_ADDR_DEL;
869 addr_buf += af->sockaddr_len;
872 /* Update the route and saddr entries for all the transports
873 * as some of the addresses in the bind address list are
874 * about to be deleted and cannot be used as source addresses.
876 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
878 sctp_transport_route(transport, NULL,
879 sctp_sk(asoc->base.sk));
883 /* We don't need to transmit ASCONF */
885 retval = sctp_send_asconf(asoc, chunk);
891 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
892 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
894 struct sock *sk = sctp_opt2sk(sp);
895 union sctp_addr *addr;
898 /* It is safe to write port space in caller. */
900 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
901 af = sctp_get_af_specific(addr->sa.sa_family);
904 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
907 if (addrw->state == SCTP_ADDR_NEW)
908 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
910 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
913 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
916 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
919 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
920 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
923 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
924 * Section 3.1.2 for this usage.
926 * addrs is a pointer to an array of one or more socket addresses. Each
927 * address is contained in its appropriate structure (i.e. struct
928 * sockaddr_in or struct sockaddr_in6) the family of the address type
929 * must be used to distinguish the address length (note that this
930 * representation is termed a "packed array" of addresses). The caller
931 * specifies the number of addresses in the array with addrcnt.
933 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
934 * -1, and sets errno to the appropriate error code.
936 * For SCTP, the port given in each socket address must be the same, or
937 * sctp_bindx() will fail, setting errno to EINVAL.
939 * The flags parameter is formed from the bitwise OR of zero or more of
940 * the following currently defined flags:
942 * SCTP_BINDX_ADD_ADDR
944 * SCTP_BINDX_REM_ADDR
946 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
947 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
948 * addresses from the association. The two flags are mutually exclusive;
949 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
950 * not remove all addresses from an association; sctp_bindx() will
951 * reject such an attempt with EINVAL.
953 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
954 * additional addresses with an endpoint after calling bind(). Or use
955 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
956 * socket is associated with so that no new association accepted will be
957 * associated with those addresses. If the endpoint supports dynamic
958 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
959 * endpoint to send the appropriate message to the peer to change the
960 * peers address lists.
962 * Adding and removing addresses from a connected association is
963 * optional functionality. Implementations that do not support this
964 * functionality should return EOPNOTSUPP.
966 * Basically do nothing but copying the addresses from user to kernel
967 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
968 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
971 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
974 * sk The sk of the socket
975 * addrs The pointer to the addresses
976 * addrssize Size of the addrs buffer
977 * op Operation to perform (add or remove, see the flags of
980 * Returns 0 if ok, <0 errno code on error.
982 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
983 int addrs_size, int op)
988 struct sockaddr *sa_addr;
989 void *addr_buf = addrs;
992 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
993 __func__, sk, addr_buf, addrs_size, op);
995 if (unlikely(addrs_size <= 0))
998 /* Walk through the addrs buffer and count the number of addresses. */
999 while (walk_size < addrs_size) {
1000 if (walk_size + sizeof(sa_family_t) > addrs_size)
1004 af = sctp_get_af_specific(sa_addr->sa_family);
1006 /* If the address family is not supported or if this address
1007 * causes the address buffer to overflow return EINVAL.
1009 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1012 addr_buf += af->sockaddr_len;
1013 walk_size += af->sockaddr_len;
1018 case SCTP_BINDX_ADD_ADDR:
1019 /* Allow security module to validate bindx addresses. */
1020 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1024 err = sctp_bindx_add(sk, addrs, addrcnt);
1027 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1028 case SCTP_BINDX_REM_ADDR:
1029 err = sctp_bindx_rem(sk, addrs, addrcnt);
1032 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1039 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1045 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1050 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1051 const union sctp_addr *daddr,
1052 const struct sctp_initmsg *init,
1053 struct sctp_transport **tp)
1055 struct sctp_association *asoc;
1056 struct sock *sk = ep->base.sk;
1057 struct net *net = sock_net(sk);
1058 enum sctp_scope scope;
1061 if (sctp_endpoint_is_peeled_off(ep, daddr))
1062 return -EADDRNOTAVAIL;
1064 if (!ep->base.bind_addr.port) {
1065 if (sctp_autobind(sk))
1068 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1069 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1073 scope = sctp_scope(daddr);
1074 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1078 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1082 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1091 if (init->sinit_num_ostreams) {
1092 __u16 outcnt = init->sinit_num_ostreams;
1094 asoc->c.sinit_num_ostreams = outcnt;
1095 /* outcnt has been changed, need to re-init stream */
1096 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1101 if (init->sinit_max_instreams)
1102 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1104 if (init->sinit_max_attempts)
1105 asoc->max_init_attempts = init->sinit_max_attempts;
1107 if (init->sinit_max_init_timeo)
1108 asoc->max_init_timeo =
1109 msecs_to_jiffies(init->sinit_max_init_timeo);
1113 sctp_association_free(asoc);
1117 static int sctp_connect_add_peer(struct sctp_association *asoc,
1118 union sctp_addr *daddr, int addr_len)
1120 struct sctp_endpoint *ep = asoc->ep;
1121 struct sctp_association *old;
1122 struct sctp_transport *t;
1125 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1129 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1130 if (old && old != asoc)
1131 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1134 if (sctp_endpoint_is_peeled_off(ep, daddr))
1135 return -EADDRNOTAVAIL;
1137 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1144 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1146 * Common routine for handling connect() and sctp_connectx().
1147 * Connect will come in with just a single address.
1149 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1150 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1152 struct sctp_sock *sp = sctp_sk(sk);
1153 struct sctp_endpoint *ep = sp->ep;
1154 struct sctp_transport *transport;
1155 struct sctp_association *asoc;
1156 void *addr_buf = kaddrs;
1157 union sctp_addr *daddr;
1162 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1163 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1167 af = sctp_get_af_specific(daddr->sa.sa_family);
1168 if (!af || af->sockaddr_len > addrs_size)
1171 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1175 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1177 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1180 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1183 asoc = transport->asoc;
1185 addr_buf += af->sockaddr_len;
1186 walk_size = af->sockaddr_len;
1187 while (walk_size < addrs_size) {
1189 if (walk_size + sizeof(sa_family_t) > addrs_size)
1193 af = sctp_get_af_specific(daddr->sa.sa_family);
1194 if (!af || af->sockaddr_len + walk_size > addrs_size)
1197 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1200 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1204 addr_buf += af->sockaddr_len;
1205 walk_size += af->sockaddr_len;
1208 /* In case the user of sctp_connectx() wants an association
1209 * id back, assign one now.
1212 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1217 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1221 /* Initialize sk's dport and daddr for getpeername() */
1222 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1223 sp->pf->to_sk_daddr(daddr, sk);
1227 *assoc_id = asoc->assoc_id;
1229 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1230 return sctp_wait_for_connect(asoc, &timeo);
1233 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1234 __func__, asoc, kaddrs, err);
1235 sctp_association_free(asoc);
1239 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1242 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1243 * sctp_assoc_t *asoc);
1245 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1246 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1247 * or IPv6 addresses.
1249 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1250 * Section 3.1.2 for this usage.
1252 * addrs is a pointer to an array of one or more socket addresses. Each
1253 * address is contained in its appropriate structure (i.e. struct
1254 * sockaddr_in or struct sockaddr_in6) the family of the address type
1255 * must be used to distengish the address length (note that this
1256 * representation is termed a "packed array" of addresses). The caller
1257 * specifies the number of addresses in the array with addrcnt.
1259 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1260 * the association id of the new association. On failure, sctp_connectx()
1261 * returns -1, and sets errno to the appropriate error code. The assoc_id
1262 * is not touched by the kernel.
1264 * For SCTP, the port given in each socket address must be the same, or
1265 * sctp_connectx() will fail, setting errno to EINVAL.
1267 * An application can use sctp_connectx to initiate an association with
1268 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1269 * allows a caller to specify multiple addresses at which a peer can be
1270 * reached. The way the SCTP stack uses the list of addresses to set up
1271 * the association is implementation dependent. This function only
1272 * specifies that the stack will try to make use of all the addresses in
1273 * the list when needed.
1275 * Note that the list of addresses passed in is only used for setting up
1276 * the association. It does not necessarily equal the set of addresses
1277 * the peer uses for the resulting association. If the caller wants to
1278 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1279 * retrieve them after the association has been set up.
1281 * Basically do nothing but copying the addresses from user to kernel
1282 * land and invoking either sctp_connectx(). This is used for tunneling
1283 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1285 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1288 * sk The sk of the socket
1289 * addrs The pointer to the addresses
1290 * addrssize Size of the addrs buffer
1292 * Returns >=0 if ok, <0 errno code on error.
1294 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1295 int addrs_size, sctp_assoc_t *assoc_id)
1297 int err = 0, flags = 0;
1299 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1300 __func__, sk, kaddrs, addrs_size);
1302 /* make sure the 1st addr's sa_family is accessible later */
1303 if (unlikely(addrs_size < sizeof(sa_family_t)))
1306 /* Allow security module to validate connectx addresses. */
1307 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1308 (struct sockaddr *)kaddrs,
1313 /* in-kernel sockets don't generally have a file allocated to them
1314 * if all they do is call sock_create_kern().
1316 if (sk->sk_socket->file)
1317 flags = sk->sk_socket->file->f_flags;
1319 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1323 * This is an older interface. It's kept for backward compatibility
1324 * to the option that doesn't provide association id.
1326 static int sctp_setsockopt_connectx_old(struct sock *sk,
1327 struct sockaddr *kaddrs,
1330 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1334 * New interface for the API. The since the API is done with a socket
1335 * option, to make it simple we feed back the association id is as a return
1336 * indication to the call. Error is always negative and association id is
1339 static int sctp_setsockopt_connectx(struct sock *sk,
1340 struct sockaddr *kaddrs,
1343 sctp_assoc_t assoc_id = 0;
1346 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1355 * New (hopefully final) interface for the API.
1356 * We use the sctp_getaddrs_old structure so that use-space library
1357 * can avoid any unnecessary allocations. The only different part
1358 * is that we store the actual length of the address buffer into the
1359 * addrs_num structure member. That way we can re-use the existing
1362 #ifdef CONFIG_COMPAT
1363 struct compat_sctp_getaddrs_old {
1364 sctp_assoc_t assoc_id;
1366 compat_uptr_t addrs; /* struct sockaddr * */
1370 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1371 char __user *optval,
1374 struct sctp_getaddrs_old param;
1375 sctp_assoc_t assoc_id = 0;
1376 struct sockaddr *kaddrs;
1379 #ifdef CONFIG_COMPAT
1380 if (in_compat_syscall()) {
1381 struct compat_sctp_getaddrs_old param32;
1383 if (len < sizeof(param32))
1385 if (copy_from_user(¶m32, optval, sizeof(param32)))
1388 param.assoc_id = param32.assoc_id;
1389 param.addr_num = param32.addr_num;
1390 param.addrs = compat_ptr(param32.addrs);
1394 if (len < sizeof(param))
1396 if (copy_from_user(¶m, optval, sizeof(param)))
1400 kaddrs = memdup_user(param.addrs, param.addr_num);
1402 return PTR_ERR(kaddrs);
1404 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1406 if (err == 0 || err == -EINPROGRESS) {
1407 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1409 if (put_user(sizeof(assoc_id), optlen))
1416 /* API 3.1.4 close() - UDP Style Syntax
1417 * Applications use close() to perform graceful shutdown (as described in
1418 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1419 * by a UDP-style socket.
1423 * ret = close(int sd);
1425 * sd - the socket descriptor of the associations to be closed.
1427 * To gracefully shutdown a specific association represented by the
1428 * UDP-style socket, an application should use the sendmsg() call,
1429 * passing no user data, but including the appropriate flag in the
1430 * ancillary data (see Section xxxx).
1432 * If sd in the close() call is a branched-off socket representing only
1433 * one association, the shutdown is performed on that association only.
1435 * 4.1.6 close() - TCP Style Syntax
1437 * Applications use close() to gracefully close down an association.
1441 * int close(int sd);
1443 * sd - the socket descriptor of the association to be closed.
1445 * After an application calls close() on a socket descriptor, no further
1446 * socket operations will succeed on that descriptor.
1448 * API 7.1.4 SO_LINGER
1450 * An application using the TCP-style socket can use this option to
1451 * perform the SCTP ABORT primitive. The linger option structure is:
1454 * int l_onoff; // option on/off
1455 * int l_linger; // linger time
1458 * To enable the option, set l_onoff to 1. If the l_linger value is set
1459 * to 0, calling close() is the same as the ABORT primitive. If the
1460 * value is set to a negative value, the setsockopt() call will return
1461 * an error. If the value is set to a positive value linger_time, the
1462 * close() can be blocked for at most linger_time ms. If the graceful
1463 * shutdown phase does not finish during this period, close() will
1464 * return but the graceful shutdown phase continues in the system.
1466 static void sctp_close(struct sock *sk, long timeout)
1468 struct net *net = sock_net(sk);
1469 struct sctp_endpoint *ep;
1470 struct sctp_association *asoc;
1471 struct list_head *pos, *temp;
1472 unsigned int data_was_unread;
1474 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1476 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1477 sk->sk_shutdown = SHUTDOWN_MASK;
1478 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1480 ep = sctp_sk(sk)->ep;
1482 /* Clean up any skbs sitting on the receive queue. */
1483 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1484 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1486 /* Walk all associations on an endpoint. */
1487 list_for_each_safe(pos, temp, &ep->asocs) {
1488 asoc = list_entry(pos, struct sctp_association, asocs);
1490 if (sctp_style(sk, TCP)) {
1491 /* A closed association can still be in the list if
1492 * it belongs to a TCP-style listening socket that is
1493 * not yet accepted. If so, free it. If not, send an
1494 * ABORT or SHUTDOWN based on the linger options.
1496 if (sctp_state(asoc, CLOSED)) {
1497 sctp_association_free(asoc);
1502 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1503 !skb_queue_empty(&asoc->ulpq.reasm) ||
1504 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1505 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1506 struct sctp_chunk *chunk;
1508 chunk = sctp_make_abort_user(asoc, NULL, 0);
1509 sctp_primitive_ABORT(net, asoc, chunk);
1511 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1514 /* On a TCP-style socket, block for at most linger_time if set. */
1515 if (sctp_style(sk, TCP) && timeout)
1516 sctp_wait_for_close(sk, timeout);
1518 /* This will run the backlog queue. */
1521 /* Supposedly, no process has access to the socket, but
1522 * the net layers still may.
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.
2753 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2754 struct sctp_sack_info *params,
2755 unsigned int optlen)
2757 struct sctp_sock *sp = sctp_sk(sk);
2758 struct sctp_association *asoc;
2760 if (optlen == sizeof(struct sctp_sack_info)) {
2761 if (params->sack_delay == 0 && params->sack_freq == 0)
2763 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2764 pr_warn_ratelimited(DEPRECATED
2766 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2767 "Use struct sctp_sack_info instead\n",
2768 current->comm, task_pid_nr(current));
2770 if (params->sack_delay == 0)
2771 params->sack_freq = 1;
2773 params->sack_freq = 0;
2777 /* Validate value parameter. */
2778 if (params->sack_delay > 500)
2781 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2782 * socket is a one to many style socket, and an association
2783 * was not found, then the id was invalid.
2785 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2786 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2787 sctp_style(sk, UDP))
2791 sctp_apply_asoc_delayed_ack(params, asoc);
2796 if (sctp_style(sk, TCP))
2797 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2799 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2800 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2801 if (params->sack_delay) {
2802 sp->sackdelay = params->sack_delay;
2804 sctp_spp_sackdelay_enable(sp->param_flags);
2806 if (params->sack_freq == 1) {
2808 sctp_spp_sackdelay_disable(sp->param_flags);
2809 } else if (params->sack_freq > 1) {
2810 sp->sackfreq = params->sack_freq;
2812 sctp_spp_sackdelay_enable(sp->param_flags);
2816 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2817 params->sack_assoc_id == SCTP_ALL_ASSOC)
2818 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2819 sctp_apply_asoc_delayed_ack(params, asoc);
2824 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2826 * Applications can specify protocol parameters for the default association
2827 * initialization. The option name argument to setsockopt() and getsockopt()
2830 * Setting initialization parameters is effective only on an unconnected
2831 * socket (for UDP-style sockets only future associations are effected
2832 * by the change). With TCP-style sockets, this option is inherited by
2833 * sockets derived from a listener socket.
2835 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2836 unsigned int optlen)
2838 struct sctp_sock *sp = sctp_sk(sk);
2840 if (optlen != sizeof(struct sctp_initmsg))
2843 if (sinit->sinit_num_ostreams)
2844 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2845 if (sinit->sinit_max_instreams)
2846 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2847 if (sinit->sinit_max_attempts)
2848 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2849 if (sinit->sinit_max_init_timeo)
2850 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2856 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2858 * Applications that wish to use the sendto() system call may wish to
2859 * specify a default set of parameters that would normally be supplied
2860 * through the inclusion of ancillary data. This socket option allows
2861 * such an application to set the default sctp_sndrcvinfo structure.
2862 * The application that wishes to use this socket option simply passes
2863 * in to this call the sctp_sndrcvinfo structure defined in Section
2864 * 5.2.2) The input parameters accepted by this call include
2865 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2866 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2867 * to this call if the caller is using the UDP model.
2869 static int sctp_setsockopt_default_send_param(struct sock *sk,
2870 struct sctp_sndrcvinfo *info,
2871 unsigned int optlen)
2873 struct sctp_sock *sp = sctp_sk(sk);
2874 struct sctp_association *asoc;
2876 if (optlen != sizeof(*info))
2878 if (info->sinfo_flags &
2879 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2880 SCTP_ABORT | SCTP_EOF))
2883 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2884 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2885 sctp_style(sk, UDP))
2889 asoc->default_stream = info->sinfo_stream;
2890 asoc->default_flags = info->sinfo_flags;
2891 asoc->default_ppid = info->sinfo_ppid;
2892 asoc->default_context = info->sinfo_context;
2893 asoc->default_timetolive = info->sinfo_timetolive;
2898 if (sctp_style(sk, TCP))
2899 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2901 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2902 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2903 sp->default_stream = info->sinfo_stream;
2904 sp->default_flags = info->sinfo_flags;
2905 sp->default_ppid = info->sinfo_ppid;
2906 sp->default_context = info->sinfo_context;
2907 sp->default_timetolive = info->sinfo_timetolive;
2910 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2911 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2912 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2913 asoc->default_stream = info->sinfo_stream;
2914 asoc->default_flags = info->sinfo_flags;
2915 asoc->default_ppid = info->sinfo_ppid;
2916 asoc->default_context = info->sinfo_context;
2917 asoc->default_timetolive = info->sinfo_timetolive;
2924 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2925 * (SCTP_DEFAULT_SNDINFO)
2927 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2928 struct sctp_sndinfo *info,
2929 unsigned int optlen)
2931 struct sctp_sock *sp = sctp_sk(sk);
2932 struct sctp_association *asoc;
2934 if (optlen != sizeof(*info))
2936 if (info->snd_flags &
2937 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2938 SCTP_ABORT | SCTP_EOF))
2941 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2942 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2943 sctp_style(sk, UDP))
2947 asoc->default_stream = info->snd_sid;
2948 asoc->default_flags = info->snd_flags;
2949 asoc->default_ppid = info->snd_ppid;
2950 asoc->default_context = info->snd_context;
2955 if (sctp_style(sk, TCP))
2956 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2958 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2959 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2960 sp->default_stream = info->snd_sid;
2961 sp->default_flags = info->snd_flags;
2962 sp->default_ppid = info->snd_ppid;
2963 sp->default_context = info->snd_context;
2966 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2967 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2968 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2969 asoc->default_stream = info->snd_sid;
2970 asoc->default_flags = info->snd_flags;
2971 asoc->default_ppid = info->snd_ppid;
2972 asoc->default_context = info->snd_context;
2979 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2981 * Requests that the local SCTP stack use the enclosed peer address as
2982 * the association primary. The enclosed address must be one of the
2983 * association peer's addresses.
2985 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
2986 unsigned int optlen)
2988 struct sctp_transport *trans;
2992 if (optlen != sizeof(struct sctp_prim))
2995 /* Allow security module to validate address but need address len. */
2996 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3000 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3001 (struct sockaddr *)&prim->ssp_addr,
3006 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3010 sctp_assoc_set_primary(trans->asoc, trans);
3016 * 7.1.5 SCTP_NODELAY
3018 * Turn on/off any Nagle-like algorithm. This means that packets are
3019 * generally sent as soon as possible and no unnecessary delays are
3020 * introduced, at the cost of more packets in the network. Expects an
3021 * integer boolean flag.
3023 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3024 unsigned int optlen)
3026 if (optlen < sizeof(int))
3028 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3034 * 7.1.1 SCTP_RTOINFO
3036 * The protocol parameters used to initialize and bound retransmission
3037 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3038 * and modify these parameters.
3039 * All parameters are time values, in milliseconds. A value of 0, when
3040 * modifying the parameters, indicates that the current value should not
3044 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3045 struct sctp_rtoinfo *rtoinfo,
3046 unsigned int optlen)
3048 struct sctp_association *asoc;
3049 unsigned long rto_min, rto_max;
3050 struct sctp_sock *sp = sctp_sk(sk);
3052 if (optlen != sizeof (struct sctp_rtoinfo))
3055 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3057 /* Set the values to the specific association */
3058 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3059 sctp_style(sk, UDP))
3062 rto_max = rtoinfo->srto_max;
3063 rto_min = rtoinfo->srto_min;
3066 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3068 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3071 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3073 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3075 if (rto_min > rto_max)
3079 if (rtoinfo->srto_initial != 0)
3081 msecs_to_jiffies(rtoinfo->srto_initial);
3082 asoc->rto_max = rto_max;
3083 asoc->rto_min = rto_min;
3085 /* If there is no association or the association-id = 0
3086 * set the values to the endpoint.
3088 if (rtoinfo->srto_initial != 0)
3089 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3090 sp->rtoinfo.srto_max = rto_max;
3091 sp->rtoinfo.srto_min = rto_min;
3099 * 7.1.2 SCTP_ASSOCINFO
3101 * This option is used to tune the maximum retransmission attempts
3102 * of the association.
3103 * Returns an error if the new association retransmission value is
3104 * greater than the sum of the retransmission value of the peer.
3105 * See [SCTP] for more information.
3108 static int sctp_setsockopt_associnfo(struct sock *sk,
3109 struct sctp_assocparams *assocparams,
3110 unsigned int optlen)
3113 struct sctp_association *asoc;
3115 if (optlen != sizeof(struct sctp_assocparams))
3118 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3120 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3121 sctp_style(sk, UDP))
3124 /* Set the values to the specific association */
3126 if (assocparams->sasoc_asocmaxrxt != 0) {
3129 struct sctp_transport *peer_addr;
3131 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3133 path_sum += peer_addr->pathmaxrxt;
3137 /* Only validate asocmaxrxt if we have more than
3138 * one path/transport. We do this because path
3139 * retransmissions are only counted when we have more
3143 assocparams->sasoc_asocmaxrxt > path_sum)
3146 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3149 if (assocparams->sasoc_cookie_life != 0)
3151 ms_to_ktime(assocparams->sasoc_cookie_life);
3153 /* Set the values to the endpoint */
3154 struct sctp_sock *sp = sctp_sk(sk);
3156 if (assocparams->sasoc_asocmaxrxt != 0)
3157 sp->assocparams.sasoc_asocmaxrxt =
3158 assocparams->sasoc_asocmaxrxt;
3159 if (assocparams->sasoc_cookie_life != 0)
3160 sp->assocparams.sasoc_cookie_life =
3161 assocparams->sasoc_cookie_life;
3167 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3169 * This socket option is a boolean flag which turns on or off mapped V4
3170 * addresses. If this option is turned on and the socket is type
3171 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3172 * If this option is turned off, then no mapping will be done of V4
3173 * addresses and a user will receive both PF_INET6 and PF_INET type
3174 * addresses on the socket.
3176 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3177 unsigned int optlen)
3179 struct sctp_sock *sp = sctp_sk(sk);
3181 if (optlen < sizeof(int))
3192 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3193 * This option will get or set the maximum size to put in any outgoing
3194 * SCTP DATA chunk. If a message is larger than this size it will be
3195 * fragmented by SCTP into the specified size. Note that the underlying
3196 * SCTP implementation may fragment into smaller sized chunks when the
3197 * PMTU of the underlying association is smaller than the value set by
3198 * the user. The default value for this option is '0' which indicates
3199 * the user is NOT limiting fragmentation and only the PMTU will effect
3200 * SCTP's choice of DATA chunk size. Note also that values set larger
3201 * than the maximum size of an IP datagram will effectively let SCTP
3202 * control fragmentation (i.e. the same as setting this option to 0).
3204 * The following structure is used to access and modify this parameter:
3206 * struct sctp_assoc_value {
3207 * sctp_assoc_t assoc_id;
3208 * uint32_t assoc_value;
3211 * assoc_id: This parameter is ignored for one-to-one style sockets.
3212 * For one-to-many style sockets this parameter indicates which
3213 * association the user is performing an action upon. Note that if
3214 * this field's value is zero then the endpoints default value is
3215 * changed (effecting future associations only).
3216 * assoc_value: This parameter specifies the maximum size in bytes.
3218 static int sctp_setsockopt_maxseg(struct sock *sk,
3219 struct sctp_assoc_value *params,
3220 unsigned int optlen)
3222 struct sctp_sock *sp = sctp_sk(sk);
3223 struct sctp_association *asoc;
3224 sctp_assoc_t assoc_id;
3227 if (optlen == sizeof(int)) {
3228 pr_warn_ratelimited(DEPRECATED
3230 "Use of int in maxseg socket option.\n"
3231 "Use struct sctp_assoc_value instead\n",
3232 current->comm, task_pid_nr(current));
3233 assoc_id = SCTP_FUTURE_ASSOC;
3234 val = *(int *)params;
3235 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3236 assoc_id = params->assoc_id;
3237 val = params->assoc_value;
3242 asoc = sctp_id2assoc(sk, assoc_id);
3243 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3244 sctp_style(sk, UDP))
3248 int min_len, max_len;
3249 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3250 sizeof(struct sctp_data_chunk);
3252 min_len = sctp_min_frag_point(sp, datasize);
3253 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3255 if (val < min_len || val > max_len)
3260 asoc->user_frag = val;
3261 sctp_assoc_update_frag_point(asoc);
3263 sp->user_frag = val;
3271 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3273 * Requests that the peer mark the enclosed address as the association
3274 * primary. The enclosed address must be one of the association's
3275 * locally bound addresses. The following structure is used to make a
3276 * set primary request:
3278 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3279 struct sctp_setpeerprim *prim,
3280 unsigned int optlen)
3282 struct sctp_sock *sp;
3283 struct sctp_association *asoc = NULL;
3284 struct sctp_chunk *chunk;
3290 if (!sp->ep->asconf_enable)
3293 if (optlen != sizeof(struct sctp_setpeerprim))
3296 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3300 if (!asoc->peer.asconf_capable)
3303 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3306 if (!sctp_state(asoc, ESTABLISHED))
3309 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3313 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3314 return -EADDRNOTAVAIL;
3316 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3317 return -EADDRNOTAVAIL;
3319 /* Allow security module to validate address. */
3320 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3321 (struct sockaddr *)&prim->sspp_addr,
3326 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3327 chunk = sctp_make_asconf_set_prim(asoc,
3328 (union sctp_addr *)&prim->sspp_addr);
3332 err = sctp_send_asconf(asoc, chunk);
3334 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3339 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3340 struct sctp_setadaptation *adapt,
3341 unsigned int optlen)
3343 if (optlen != sizeof(struct sctp_setadaptation))
3346 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3352 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3354 * The context field in the sctp_sndrcvinfo structure is normally only
3355 * used when a failed message is retrieved holding the value that was
3356 * sent down on the actual send call. This option allows the setting of
3357 * a default context on an association basis that will be received on
3358 * reading messages from the peer. This is especially helpful in the
3359 * one-2-many model for an application to keep some reference to an
3360 * internal state machine that is processing messages on the
3361 * association. Note that the setting of this value only effects
3362 * received messages from the peer and does not effect the value that is
3363 * saved with outbound messages.
3365 static int sctp_setsockopt_context(struct sock *sk,
3366 struct sctp_assoc_value *params,
3367 unsigned int optlen)
3369 struct sctp_sock *sp = sctp_sk(sk);
3370 struct sctp_association *asoc;
3372 if (optlen != sizeof(struct sctp_assoc_value))
3375 asoc = sctp_id2assoc(sk, params->assoc_id);
3376 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3377 sctp_style(sk, UDP))
3381 asoc->default_rcv_context = params->assoc_value;
3386 if (sctp_style(sk, TCP))
3387 params->assoc_id = SCTP_FUTURE_ASSOC;
3389 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3390 params->assoc_id == SCTP_ALL_ASSOC)
3391 sp->default_rcv_context = params->assoc_value;
3393 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3394 params->assoc_id == SCTP_ALL_ASSOC)
3395 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3396 asoc->default_rcv_context = params->assoc_value;
3402 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3404 * This options will at a minimum specify if the implementation is doing
3405 * fragmented interleave. Fragmented interleave, for a one to many
3406 * socket, is when subsequent calls to receive a message may return
3407 * parts of messages from different associations. Some implementations
3408 * may allow you to turn this value on or off. If so, when turned off,
3409 * no fragment interleave will occur (which will cause a head of line
3410 * blocking amongst multiple associations sharing the same one to many
3411 * socket). When this option is turned on, then each receive call may
3412 * come from a different association (thus the user must receive data
3413 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3414 * association each receive belongs to.
3416 * This option takes a boolean value. A non-zero value indicates that
3417 * fragmented interleave is on. A value of zero indicates that
3418 * fragmented interleave is off.
3420 * Note that it is important that an implementation that allows this
3421 * option to be turned on, have it off by default. Otherwise an unaware
3422 * application using the one to many model may become confused and act
3425 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3426 unsigned int optlen)
3428 if (optlen != sizeof(int))
3431 sctp_sk(sk)->frag_interleave = !!*val;
3433 if (!sctp_sk(sk)->frag_interleave)
3434 sctp_sk(sk)->ep->intl_enable = 0;
3440 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3441 * (SCTP_PARTIAL_DELIVERY_POINT)
3443 * This option will set or get the SCTP partial delivery point. This
3444 * point is the size of a message where the partial delivery API will be
3445 * invoked to help free up rwnd space for the peer. Setting this to a
3446 * lower value will cause partial deliveries to happen more often. The
3447 * calls argument is an integer that sets or gets the partial delivery
3448 * point. Note also that the call will fail if the user attempts to set
3449 * this value larger than the socket receive buffer size.
3451 * Note that any single message having a length smaller than or equal to
3452 * the SCTP partial delivery point will be delivered in one single read
3453 * call as long as the user provided buffer is large enough to hold the
3456 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3457 unsigned int optlen)
3459 if (optlen != sizeof(u32))
3462 /* Note: We double the receive buffer from what the user sets
3463 * it to be, also initial rwnd is based on rcvbuf/2.
3465 if (*val > (sk->sk_rcvbuf >> 1))
3468 sctp_sk(sk)->pd_point = *val;
3470 return 0; /* is this the right error code? */
3474 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3476 * This option will allow a user to change the maximum burst of packets
3477 * that can be emitted by this association. Note that the default value
3478 * is 4, and some implementations may restrict this setting so that it
3479 * can only be lowered.
3481 * NOTE: This text doesn't seem right. Do this on a socket basis with
3482 * future associations inheriting the socket value.
3484 static int sctp_setsockopt_maxburst(struct sock *sk,
3485 struct sctp_assoc_value *params,
3486 unsigned int optlen)
3488 struct sctp_sock *sp = sctp_sk(sk);
3489 struct sctp_association *asoc;
3490 sctp_assoc_t assoc_id;
3493 if (optlen == sizeof(int)) {
3494 pr_warn_ratelimited(DEPRECATED
3496 "Use of int in max_burst socket option deprecated.\n"
3497 "Use struct sctp_assoc_value instead\n",
3498 current->comm, task_pid_nr(current));
3499 assoc_id = SCTP_FUTURE_ASSOC;
3500 assoc_value = *((int *)params);
3501 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3502 assoc_id = params->assoc_id;
3503 assoc_value = params->assoc_value;
3507 asoc = sctp_id2assoc(sk, assoc_id);
3508 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3512 asoc->max_burst = assoc_value;
3517 if (sctp_style(sk, TCP))
3518 assoc_id = SCTP_FUTURE_ASSOC;
3520 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3521 sp->max_burst = assoc_value;
3523 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3524 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3525 asoc->max_burst = assoc_value;
3531 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3533 * This set option adds a chunk type that the user is requesting to be
3534 * received only in an authenticated way. Changes to the list of chunks
3535 * will only effect future associations on the socket.
3537 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3538 struct sctp_authchunk *val,
3539 unsigned int optlen)
3541 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3543 if (!ep->auth_enable)
3546 if (optlen != sizeof(struct sctp_authchunk))
3549 switch (val->sauth_chunk) {
3551 case SCTP_CID_INIT_ACK:
3552 case SCTP_CID_SHUTDOWN_COMPLETE:
3557 /* add this chunk id to the endpoint */
3558 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3562 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3564 * This option gets or sets the list of HMAC algorithms that the local
3565 * endpoint requires the peer to use.
3567 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3568 struct sctp_hmacalgo *hmacs,
3569 unsigned int optlen)
3571 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3574 if (!ep->auth_enable)
3577 if (optlen < sizeof(struct sctp_hmacalgo))
3579 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3580 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3582 idents = hmacs->shmac_num_idents;
3583 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3584 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3587 return sctp_auth_ep_set_hmacs(ep, hmacs);
3591 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3593 * This option will set a shared secret key which is used to build an
3594 * association shared key.
3596 static int sctp_setsockopt_auth_key(struct sock *sk,
3597 struct sctp_authkey *authkey,
3598 unsigned int optlen)
3600 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3601 struct sctp_association *asoc;
3604 if (optlen <= sizeof(struct sctp_authkey))
3606 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3609 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3611 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3614 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3615 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3616 sctp_style(sk, UDP))
3620 ret = sctp_auth_set_key(ep, asoc, authkey);
3624 if (sctp_style(sk, TCP))
3625 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3627 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3628 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3629 ret = sctp_auth_set_key(ep, asoc, authkey);
3636 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3637 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3638 list_for_each_entry(asoc, &ep->asocs, asocs) {
3639 int res = sctp_auth_set_key(ep, asoc, authkey);
3647 memzero_explicit(authkey, optlen);
3652 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3654 * This option will get or set the active shared key to be used to build
3655 * the association shared key.
3657 static int sctp_setsockopt_active_key(struct sock *sk,
3658 struct sctp_authkeyid *val,
3659 unsigned int optlen)
3661 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3662 struct sctp_association *asoc;
3665 if (optlen != sizeof(struct sctp_authkeyid))
3668 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3669 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3670 sctp_style(sk, UDP))
3674 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3676 if (sctp_style(sk, TCP))
3677 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3679 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3680 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3681 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3686 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3687 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3688 list_for_each_entry(asoc, &ep->asocs, asocs) {
3689 int res = sctp_auth_set_active_key(ep, asoc,
3690 val->scact_keynumber);
3701 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3703 * This set option will delete a shared secret key from use.
3705 static int sctp_setsockopt_del_key(struct sock *sk,
3706 struct sctp_authkeyid *val,
3707 unsigned int optlen)
3709 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3710 struct sctp_association *asoc;
3713 if (optlen != sizeof(struct sctp_authkeyid))
3716 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3717 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3718 sctp_style(sk, UDP))
3722 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3724 if (sctp_style(sk, TCP))
3725 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3727 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3728 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3729 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3734 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3735 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3736 list_for_each_entry(asoc, &ep->asocs, asocs) {
3737 int res = sctp_auth_del_key_id(ep, asoc,
3738 val->scact_keynumber);
3749 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3751 * This set option will deactivate a shared secret key.
3753 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3754 struct sctp_authkeyid *val,
3755 unsigned int optlen)
3757 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3758 struct sctp_association *asoc;
3761 if (optlen != sizeof(struct sctp_authkeyid))
3764 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3765 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3766 sctp_style(sk, UDP))
3770 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3772 if (sctp_style(sk, TCP))
3773 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3775 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3776 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3777 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3782 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3783 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3784 list_for_each_entry(asoc, &ep->asocs, asocs) {
3785 int res = sctp_auth_deact_key_id(ep, asoc,
3786 val->scact_keynumber);
3797 * 8.1.23 SCTP_AUTO_ASCONF
3799 * This option will enable or disable the use of the automatic generation of
3800 * ASCONF chunks to add and delete addresses to an existing association. Note
3801 * that this option has two caveats namely: a) it only affects sockets that
3802 * are bound to all addresses available to the SCTP stack, and b) the system
3803 * administrator may have an overriding control that turns the ASCONF feature
3804 * off no matter what setting the socket option may have.
3805 * This option expects an integer boolean flag, where a non-zero value turns on
3806 * the option, and a zero value turns off the option.
3807 * Note. In this implementation, socket operation overrides default parameter
3808 * being set by sysctl as well as FreeBSD implementation
3810 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3811 unsigned int optlen)
3813 struct sctp_sock *sp = sctp_sk(sk);
3815 if (optlen < sizeof(int))
3817 if (!sctp_is_ep_boundall(sk) && *val)
3819 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3822 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3823 if (*val == 0 && sp->do_auto_asconf) {
3824 list_del(&sp->auto_asconf_list);
3825 sp->do_auto_asconf = 0;
3826 } else if (*val && !sp->do_auto_asconf) {
3827 list_add_tail(&sp->auto_asconf_list,
3828 &sock_net(sk)->sctp.auto_asconf_splist);
3829 sp->do_auto_asconf = 1;
3831 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3836 * SCTP_PEER_ADDR_THLDS
3838 * This option allows us to alter the partially failed threshold for one or all
3839 * transports in an association. See Section 6.1 of:
3840 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3842 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3843 struct sctp_paddrthlds_v2 *val,
3844 unsigned int optlen, bool v2)
3846 struct sctp_transport *trans;
3847 struct sctp_association *asoc;
3850 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3854 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3857 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3858 trans = sctp_addr_id2transport(sk, &val->spt_address,
3863 if (val->spt_pathmaxrxt)
3864 trans->pathmaxrxt = val->spt_pathmaxrxt;
3866 trans->ps_retrans = val->spt_pathcpthld;
3867 trans->pf_retrans = val->spt_pathpfthld;
3872 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3873 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3874 sctp_style(sk, UDP))
3878 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3880 if (val->spt_pathmaxrxt)
3881 trans->pathmaxrxt = val->spt_pathmaxrxt;
3883 trans->ps_retrans = val->spt_pathcpthld;
3884 trans->pf_retrans = val->spt_pathpfthld;
3887 if (val->spt_pathmaxrxt)
3888 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3890 asoc->ps_retrans = val->spt_pathcpthld;
3891 asoc->pf_retrans = val->spt_pathpfthld;
3893 struct sctp_sock *sp = sctp_sk(sk);
3895 if (val->spt_pathmaxrxt)
3896 sp->pathmaxrxt = val->spt_pathmaxrxt;
3898 sp->ps_retrans = val->spt_pathcpthld;
3899 sp->pf_retrans = val->spt_pathpfthld;
3905 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3906 unsigned int optlen)
3908 if (optlen < sizeof(int))
3911 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3916 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3917 unsigned int optlen)
3919 if (optlen < sizeof(int))
3922 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3927 static int sctp_setsockopt_pr_supported(struct sock *sk,
3928 struct sctp_assoc_value *params,
3929 unsigned int optlen)
3931 struct sctp_association *asoc;
3933 if (optlen != sizeof(*params))
3936 asoc = sctp_id2assoc(sk, params->assoc_id);
3937 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3938 sctp_style(sk, UDP))
3941 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3946 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3947 struct sctp_default_prinfo *info,
3948 unsigned int optlen)
3950 struct sctp_sock *sp = sctp_sk(sk);
3951 struct sctp_association *asoc;
3952 int retval = -EINVAL;
3954 if (optlen != sizeof(*info))
3957 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3960 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3963 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3964 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3965 sctp_style(sk, UDP))
3971 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3972 asoc->default_timetolive = info->pr_value;
3976 if (sctp_style(sk, TCP))
3977 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
3979 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
3980 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3981 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
3982 sp->default_timetolive = info->pr_value;
3985 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
3986 info->pr_assoc_id == SCTP_ALL_ASSOC) {
3987 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3988 SCTP_PR_SET_POLICY(asoc->default_flags,
3990 asoc->default_timetolive = info->pr_value;
3998 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3999 struct sctp_assoc_value *params,
4000 unsigned int optlen)
4002 struct sctp_association *asoc;
4003 int retval = -EINVAL;
4005 if (optlen != sizeof(*params))
4008 asoc = sctp_id2assoc(sk, params->assoc_id);
4009 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4010 sctp_style(sk, UDP))
4013 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4021 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4022 struct sctp_assoc_value *params,
4023 unsigned int optlen)
4025 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4026 struct sctp_association *asoc;
4027 int retval = -EINVAL;
4029 if (optlen != sizeof(*params))
4032 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4035 asoc = sctp_id2assoc(sk, params->assoc_id);
4036 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4037 sctp_style(sk, UDP))
4043 asoc->strreset_enable = params->assoc_value;
4047 if (sctp_style(sk, TCP))
4048 params->assoc_id = SCTP_FUTURE_ASSOC;
4050 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4051 params->assoc_id == SCTP_ALL_ASSOC)
4052 ep->strreset_enable = params->assoc_value;
4054 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4055 params->assoc_id == SCTP_ALL_ASSOC)
4056 list_for_each_entry(asoc, &ep->asocs, asocs)
4057 asoc->strreset_enable = params->assoc_value;
4063 static int sctp_setsockopt_reset_streams(struct sock *sk,
4064 struct sctp_reset_streams *params,
4065 unsigned int optlen)
4067 struct sctp_association *asoc;
4069 if (optlen < sizeof(*params))
4071 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4072 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4073 sizeof(__u16) * sizeof(*params));
4075 if (params->srs_number_streams * sizeof(__u16) >
4076 optlen - sizeof(*params))
4079 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4083 return sctp_send_reset_streams(asoc, params);
4086 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4087 unsigned int optlen)
4089 struct sctp_association *asoc;
4091 if (optlen != sizeof(*associd))
4094 asoc = sctp_id2assoc(sk, *associd);
4098 return sctp_send_reset_assoc(asoc);
4101 static int sctp_setsockopt_add_streams(struct sock *sk,
4102 char __user *optval,
4103 unsigned int optlen)
4105 struct sctp_association *asoc;
4106 struct sctp_add_streams params;
4107 int retval = -EINVAL;
4109 if (optlen != sizeof(params))
4112 if (copy_from_user(¶ms, optval, optlen)) {
4117 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4121 retval = sctp_send_add_streams(asoc, ¶ms);
4127 static int sctp_setsockopt_scheduler(struct sock *sk,
4128 char __user *optval,
4129 unsigned int optlen)
4131 struct sctp_sock *sp = sctp_sk(sk);
4132 struct sctp_association *asoc;
4133 struct sctp_assoc_value params;
4136 if (optlen < sizeof(params))
4139 optlen = sizeof(params);
4140 if (copy_from_user(¶ms, optval, optlen))
4143 if (params.assoc_value > SCTP_SS_MAX)
4146 asoc = sctp_id2assoc(sk, params.assoc_id);
4147 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4148 sctp_style(sk, UDP))
4152 return sctp_sched_set_sched(asoc, params.assoc_value);
4154 if (sctp_style(sk, TCP))
4155 params.assoc_id = SCTP_FUTURE_ASSOC;
4157 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4158 params.assoc_id == SCTP_ALL_ASSOC)
4159 sp->default_ss = params.assoc_value;
4161 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4162 params.assoc_id == SCTP_ALL_ASSOC) {
4163 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4164 int ret = sctp_sched_set_sched(asoc,
4165 params.assoc_value);
4175 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4176 char __user *optval,
4177 unsigned int optlen)
4179 struct sctp_stream_value params;
4180 struct sctp_association *asoc;
4181 int retval = -EINVAL;
4183 if (optlen < sizeof(params))
4186 optlen = sizeof(params);
4187 if (copy_from_user(¶ms, optval, optlen)) {
4192 asoc = sctp_id2assoc(sk, params.assoc_id);
4193 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4194 sctp_style(sk, UDP))
4198 retval = sctp_sched_set_value(asoc, params.stream_id,
4199 params.stream_value, GFP_KERNEL);
4205 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4206 int ret = sctp_sched_set_value(asoc, params.stream_id,
4207 params.stream_value, GFP_KERNEL);
4208 if (ret && !retval) /* try to return the 1st error. */
4216 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4217 char __user *optval,
4218 unsigned int optlen)
4220 struct sctp_sock *sp = sctp_sk(sk);
4221 struct sctp_assoc_value params;
4222 struct sctp_association *asoc;
4223 int retval = -EINVAL;
4225 if (optlen < sizeof(params))
4228 optlen = sizeof(params);
4229 if (copy_from_user(¶ms, optval, optlen)) {
4234 asoc = sctp_id2assoc(sk, params.assoc_id);
4235 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4236 sctp_style(sk, UDP))
4239 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4244 sp->ep->intl_enable = !!params.assoc_value;
4252 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4253 unsigned int optlen)
4257 if (!sctp_style(sk, TCP))
4260 if (sctp_sk(sk)->ep->base.bind_addr.port)
4263 if (optlen < sizeof(int))
4266 if (get_user(val, (int __user *)optval))
4269 sctp_sk(sk)->reuse = !!val;
4274 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4275 struct sctp_association *asoc)
4277 struct sctp_ulpevent *event;
4279 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4281 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4282 if (sctp_outq_is_empty(&asoc->outqueue)) {
4283 event = sctp_ulpevent_make_sender_dry_event(asoc,
4284 GFP_USER | __GFP_NOWARN);
4288 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4295 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4296 unsigned int optlen)
4298 struct sctp_sock *sp = sctp_sk(sk);
4299 struct sctp_association *asoc;
4300 struct sctp_event param;
4303 if (optlen < sizeof(param))
4306 optlen = sizeof(param);
4307 if (copy_from_user(¶m, optval, optlen))
4310 if (param.se_type < SCTP_SN_TYPE_BASE ||
4311 param.se_type > SCTP_SN_TYPE_MAX)
4314 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4315 if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4316 sctp_style(sk, UDP))
4320 return sctp_assoc_ulpevent_type_set(¶m, asoc);
4322 if (sctp_style(sk, TCP))
4323 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4325 if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4326 param.se_assoc_id == SCTP_ALL_ASSOC)
4327 sctp_ulpevent_type_set(&sp->subscribe,
4328 param.se_type, param.se_on);
4330 if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4331 param.se_assoc_id == SCTP_ALL_ASSOC) {
4332 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4333 int ret = sctp_assoc_ulpevent_type_set(¶m, asoc);
4343 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4344 char __user *optval,
4345 unsigned int optlen)
4347 struct sctp_assoc_value params;
4348 struct sctp_association *asoc;
4349 struct sctp_endpoint *ep;
4350 int retval = -EINVAL;
4352 if (optlen != sizeof(params))
4355 if (copy_from_user(¶ms, optval, optlen)) {
4360 asoc = sctp_id2assoc(sk, params.assoc_id);
4361 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4362 sctp_style(sk, UDP))
4365 ep = sctp_sk(sk)->ep;
4366 ep->asconf_enable = !!params.assoc_value;
4368 if (ep->asconf_enable && ep->auth_enable) {
4369 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4370 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4379 static int sctp_setsockopt_auth_supported(struct sock *sk,
4380 char __user *optval,
4381 unsigned int optlen)
4383 struct sctp_assoc_value params;
4384 struct sctp_association *asoc;
4385 struct sctp_endpoint *ep;
4386 int retval = -EINVAL;
4388 if (optlen != sizeof(params))
4391 if (copy_from_user(¶ms, optval, optlen)) {
4396 asoc = sctp_id2assoc(sk, params.assoc_id);
4397 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4398 sctp_style(sk, UDP))
4401 ep = sctp_sk(sk)->ep;
4402 if (params.assoc_value) {
4403 retval = sctp_auth_init(ep, GFP_KERNEL);
4406 if (ep->asconf_enable) {
4407 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4408 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4412 ep->auth_enable = !!params.assoc_value;
4419 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4420 char __user *optval,
4421 unsigned int optlen)
4423 struct sctp_assoc_value params;
4424 struct sctp_association *asoc;
4425 int retval = -EINVAL;
4427 if (optlen != sizeof(params))
4430 if (copy_from_user(¶ms, optval, optlen)) {
4435 asoc = sctp_id2assoc(sk, params.assoc_id);
4436 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4437 sctp_style(sk, UDP))
4440 sctp_sk(sk)->ep->ecn_enable = !!params.assoc_value;
4447 static int sctp_setsockopt_pf_expose(struct sock *sk,
4448 char __user *optval,
4449 unsigned int optlen)
4451 struct sctp_assoc_value params;
4452 struct sctp_association *asoc;
4453 int retval = -EINVAL;
4455 if (optlen != sizeof(params))
4458 if (copy_from_user(¶ms, optval, optlen)) {
4463 if (params.assoc_value > SCTP_PF_EXPOSE_MAX)
4466 asoc = sctp_id2assoc(sk, params.assoc_id);
4467 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4468 sctp_style(sk, UDP))
4472 asoc->pf_expose = params.assoc_value;
4474 sctp_sk(sk)->pf_expose = params.assoc_value;
4481 /* API 6.2 setsockopt(), getsockopt()
4483 * Applications use setsockopt() and getsockopt() to set or retrieve
4484 * socket options. Socket options are used to change the default
4485 * behavior of sockets calls. They are described in Section 7.
4489 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4490 * int __user *optlen);
4491 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4494 * sd - the socket descript.
4495 * level - set to IPPROTO_SCTP for all SCTP options.
4496 * optname - the option name.
4497 * optval - the buffer to store the value of the option.
4498 * optlen - the size of the buffer.
4500 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4501 char __user *optval, unsigned int optlen)
4506 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4508 /* I can hardly begin to describe how wrong this is. This is
4509 * so broken as to be worse than useless. The API draft
4510 * REALLY is NOT helpful here... I am not convinced that the
4511 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4512 * are at all well-founded.
4514 if (level != SOL_SCTP) {
4515 struct sctp_af *af = sctp_sk(sk)->pf->af;
4516 retval = af->setsockopt(sk, level, optname, optval, optlen);
4521 kopt = memdup_user(optval, optlen);
4523 return PTR_ERR(kopt);
4529 case SCTP_SOCKOPT_BINDX_ADD:
4530 /* 'optlen' is the size of the addresses buffer. */
4531 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4532 SCTP_BINDX_ADD_ADDR);
4535 case SCTP_SOCKOPT_BINDX_REM:
4536 /* 'optlen' is the size of the addresses buffer. */
4537 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4538 SCTP_BINDX_REM_ADDR);
4541 case SCTP_SOCKOPT_CONNECTX_OLD:
4542 /* 'optlen' is the size of the addresses buffer. */
4543 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4546 case SCTP_SOCKOPT_CONNECTX:
4547 /* 'optlen' is the size of the addresses buffer. */
4548 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4551 case SCTP_DISABLE_FRAGMENTS:
4552 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4556 retval = sctp_setsockopt_events(sk, kopt, optlen);
4559 case SCTP_AUTOCLOSE:
4560 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4563 case SCTP_PEER_ADDR_PARAMS:
4564 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4567 case SCTP_DELAYED_SACK:
4568 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4570 case SCTP_PARTIAL_DELIVERY_POINT:
4571 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4575 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4577 case SCTP_DEFAULT_SEND_PARAM:
4578 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4580 case SCTP_DEFAULT_SNDINFO:
4581 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4583 case SCTP_PRIMARY_ADDR:
4584 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4586 case SCTP_SET_PEER_PRIMARY_ADDR:
4587 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4590 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4593 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4595 case SCTP_ASSOCINFO:
4596 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4598 case SCTP_I_WANT_MAPPED_V4_ADDR:
4599 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4602 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4604 case SCTP_ADAPTATION_LAYER:
4605 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4608 retval = sctp_setsockopt_context(sk, kopt, optlen);
4610 case SCTP_FRAGMENT_INTERLEAVE:
4611 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4613 case SCTP_MAX_BURST:
4614 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4616 case SCTP_AUTH_CHUNK:
4617 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4619 case SCTP_HMAC_IDENT:
4620 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4623 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4625 case SCTP_AUTH_ACTIVE_KEY:
4626 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4628 case SCTP_AUTH_DELETE_KEY:
4629 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4631 case SCTP_AUTH_DEACTIVATE_KEY:
4632 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4634 case SCTP_AUTO_ASCONF:
4635 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4637 case SCTP_PEER_ADDR_THLDS:
4638 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4641 case SCTP_PEER_ADDR_THLDS_V2:
4642 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4645 case SCTP_RECVRCVINFO:
4646 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4648 case SCTP_RECVNXTINFO:
4649 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4651 case SCTP_PR_SUPPORTED:
4652 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4654 case SCTP_DEFAULT_PRINFO:
4655 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4657 case SCTP_RECONFIG_SUPPORTED:
4658 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4660 case SCTP_ENABLE_STREAM_RESET:
4661 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4663 case SCTP_RESET_STREAMS:
4664 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4666 case SCTP_RESET_ASSOC:
4667 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4669 case SCTP_ADD_STREAMS:
4670 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4672 case SCTP_STREAM_SCHEDULER:
4673 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4675 case SCTP_STREAM_SCHEDULER_VALUE:
4676 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4678 case SCTP_INTERLEAVING_SUPPORTED:
4679 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4682 case SCTP_REUSE_PORT:
4683 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4686 retval = sctp_setsockopt_event(sk, optval, optlen);
4688 case SCTP_ASCONF_SUPPORTED:
4689 retval = sctp_setsockopt_asconf_supported(sk, optval, optlen);
4691 case SCTP_AUTH_SUPPORTED:
4692 retval = sctp_setsockopt_auth_supported(sk, optval, optlen);
4694 case SCTP_ECN_SUPPORTED:
4695 retval = sctp_setsockopt_ecn_supported(sk, optval, optlen);
4697 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4698 retval = sctp_setsockopt_pf_expose(sk, optval, optlen);
4701 retval = -ENOPROTOOPT;
4712 /* API 3.1.6 connect() - UDP Style Syntax
4714 * An application may use the connect() call in the UDP model to initiate an
4715 * association without sending data.
4719 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4721 * sd: the socket descriptor to have a new association added to.
4723 * nam: the address structure (either struct sockaddr_in or struct
4724 * sockaddr_in6 defined in RFC2553 [7]).
4726 * len: the size of the address.
4728 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4729 int addr_len, int flags)
4735 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4738 /* Validate addr_len before calling common connect/connectx routine. */
4739 af = sctp_get_af_specific(addr->sa_family);
4740 if (af && addr_len >= af->sockaddr_len)
4741 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4747 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4748 int addr_len, int flags)
4750 if (addr_len < sizeof(uaddr->sa_family))
4753 if (uaddr->sa_family == AF_UNSPEC)
4756 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4759 /* FIXME: Write comments. */
4760 static int sctp_disconnect(struct sock *sk, int flags)
4762 return -EOPNOTSUPP; /* STUB */
4765 /* 4.1.4 accept() - TCP Style Syntax
4767 * Applications use accept() call to remove an established SCTP
4768 * association from the accept queue of the endpoint. A new socket
4769 * descriptor will be returned from accept() to represent the newly
4770 * formed association.
4772 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4774 struct sctp_sock *sp;
4775 struct sctp_endpoint *ep;
4776 struct sock *newsk = NULL;
4777 struct sctp_association *asoc;
4786 if (!sctp_style(sk, TCP)) {
4787 error = -EOPNOTSUPP;
4791 if (!sctp_sstate(sk, LISTENING)) {
4796 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4798 error = sctp_wait_for_accept(sk, timeo);
4802 /* We treat the list of associations on the endpoint as the accept
4803 * queue and pick the first association on the list.
4805 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4807 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4813 /* Populate the fields of the newsk from the oldsk and migrate the
4814 * asoc to the newsk.
4816 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4818 sk_common_release(newsk);
4828 /* The SCTP ioctl handler. */
4829 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4836 * SEQPACKET-style sockets in LISTENING state are valid, for
4837 * SCTP, so only discard TCP-style sockets in LISTENING state.
4839 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4844 struct sk_buff *skb;
4845 unsigned int amount = 0;
4847 skb = skb_peek(&sk->sk_receive_queue);
4850 * We will only return the amount of this packet since
4851 * that is all that will be read.
4855 rc = put_user(amount, (int __user *)arg);
4867 /* This is the function which gets called during socket creation to
4868 * initialized the SCTP-specific portion of the sock.
4869 * The sock structure should already be zero-filled memory.
4871 static int sctp_init_sock(struct sock *sk)
4873 struct net *net = sock_net(sk);
4874 struct sctp_sock *sp;
4876 pr_debug("%s: sk:%p\n", __func__, sk);
4880 /* Initialize the SCTP per socket area. */
4881 switch (sk->sk_type) {
4882 case SOCK_SEQPACKET:
4883 sp->type = SCTP_SOCKET_UDP;
4886 sp->type = SCTP_SOCKET_TCP;
4889 return -ESOCKTNOSUPPORT;
4892 sk->sk_gso_type = SKB_GSO_SCTP;
4894 /* Initialize default send parameters. These parameters can be
4895 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4897 sp->default_stream = 0;
4898 sp->default_ppid = 0;
4899 sp->default_flags = 0;
4900 sp->default_context = 0;
4901 sp->default_timetolive = 0;
4903 sp->default_rcv_context = 0;
4904 sp->max_burst = net->sctp.max_burst;
4906 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4908 /* Initialize default setup parameters. These parameters
4909 * can be modified with the SCTP_INITMSG socket option or
4910 * overridden by the SCTP_INIT CMSG.
4912 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4913 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4914 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4915 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4917 /* Initialize default RTO related parameters. These parameters can
4918 * be modified for with the SCTP_RTOINFO socket option.
4920 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4921 sp->rtoinfo.srto_max = net->sctp.rto_max;
4922 sp->rtoinfo.srto_min = net->sctp.rto_min;
4924 /* Initialize default association related parameters. These parameters
4925 * can be modified with the SCTP_ASSOCINFO socket option.
4927 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4928 sp->assocparams.sasoc_number_peer_destinations = 0;
4929 sp->assocparams.sasoc_peer_rwnd = 0;
4930 sp->assocparams.sasoc_local_rwnd = 0;
4931 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4933 /* Initialize default event subscriptions. By default, all the
4938 /* Default Peer Address Parameters. These defaults can
4939 * be modified via SCTP_PEER_ADDR_PARAMS
4941 sp->hbinterval = net->sctp.hb_interval;
4942 sp->pathmaxrxt = net->sctp.max_retrans_path;
4943 sp->pf_retrans = net->sctp.pf_retrans;
4944 sp->ps_retrans = net->sctp.ps_retrans;
4945 sp->pf_expose = net->sctp.pf_expose;
4946 sp->pathmtu = 0; /* allow default discovery */
4947 sp->sackdelay = net->sctp.sack_timeout;
4949 sp->param_flags = SPP_HB_ENABLE |
4951 SPP_SACKDELAY_ENABLE;
4952 sp->default_ss = SCTP_SS_DEFAULT;
4954 /* If enabled no SCTP message fragmentation will be performed.
4955 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4957 sp->disable_fragments = 0;
4959 /* Enable Nagle algorithm by default. */
4962 sp->recvrcvinfo = 0;
4963 sp->recvnxtinfo = 0;
4965 /* Enable by default. */
4968 /* Auto-close idle associations after the configured
4969 * number of seconds. A value of 0 disables this
4970 * feature. Configure through the SCTP_AUTOCLOSE socket option,
4971 * for UDP-style sockets only.
4975 /* User specified fragmentation limit. */
4978 sp->adaptation_ind = 0;
4980 sp->pf = sctp_get_pf_specific(sk->sk_family);
4982 /* Control variables for partial data delivery. */
4983 atomic_set(&sp->pd_mode, 0);
4984 skb_queue_head_init(&sp->pd_lobby);
4985 sp->frag_interleave = 0;
4987 /* Create a per socket endpoint structure. Even if we
4988 * change the data structure relationships, this may still
4989 * be useful for storing pre-connect address information.
4991 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4997 sk->sk_destruct = sctp_destruct_sock;
4999 SCTP_DBG_OBJCNT_INC(sock);
5002 sk_sockets_allocated_inc(sk);
5003 sock_prot_inuse_add(net, sk->sk_prot, 1);
5005 /* Nothing can fail after this block, otherwise
5006 * sctp_destroy_sock() will be called without addr_wq_lock held
5008 if (net->sctp.default_auto_asconf) {
5009 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5010 list_add_tail(&sp->auto_asconf_list,
5011 &net->sctp.auto_asconf_splist);
5012 sp->do_auto_asconf = 1;
5013 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5015 sp->do_auto_asconf = 0;
5023 /* Cleanup any SCTP per socket resources. Must be called with
5024 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5026 static void sctp_destroy_sock(struct sock *sk)
5028 struct sctp_sock *sp;
5030 pr_debug("%s: sk:%p\n", __func__, sk);
5032 /* Release our hold on the endpoint. */
5034 /* This could happen during socket init, thus we bail out
5035 * early, since the rest of the below is not setup either.
5040 if (sp->do_auto_asconf) {
5041 sp->do_auto_asconf = 0;
5042 list_del(&sp->auto_asconf_list);
5044 sctp_endpoint_free(sp->ep);
5046 sk_sockets_allocated_dec(sk);
5047 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5051 /* Triggered when there are no references on the socket anymore */
5052 static void sctp_destruct_sock(struct sock *sk)
5054 struct sctp_sock *sp = sctp_sk(sk);
5056 /* Free up the HMAC transform. */
5057 crypto_free_shash(sp->hmac);
5059 inet_sock_destruct(sk);
5062 /* API 4.1.7 shutdown() - TCP Style Syntax
5063 * int shutdown(int socket, int how);
5065 * sd - the socket descriptor of the association to be closed.
5066 * how - Specifies the type of shutdown. The values are
5069 * Disables further receive operations. No SCTP
5070 * protocol action is taken.
5072 * Disables further send operations, and initiates
5073 * the SCTP shutdown sequence.
5075 * Disables further send and receive operations
5076 * and initiates the SCTP shutdown sequence.
5078 static void sctp_shutdown(struct sock *sk, int how)
5080 struct net *net = sock_net(sk);
5081 struct sctp_endpoint *ep;
5083 if (!sctp_style(sk, TCP))
5086 ep = sctp_sk(sk)->ep;
5087 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5088 struct sctp_association *asoc;
5090 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5091 asoc = list_entry(ep->asocs.next,
5092 struct sctp_association, asocs);
5093 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5097 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5098 struct sctp_info *info)
5100 struct sctp_transport *prim;
5101 struct list_head *pos;
5104 memset(info, 0, sizeof(*info));
5106 struct sctp_sock *sp = sctp_sk(sk);
5108 info->sctpi_s_autoclose = sp->autoclose;
5109 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5110 info->sctpi_s_pd_point = sp->pd_point;
5111 info->sctpi_s_nodelay = sp->nodelay;
5112 info->sctpi_s_disable_fragments = sp->disable_fragments;
5113 info->sctpi_s_v4mapped = sp->v4mapped;
5114 info->sctpi_s_frag_interleave = sp->frag_interleave;
5115 info->sctpi_s_type = sp->type;
5120 info->sctpi_tag = asoc->c.my_vtag;
5121 info->sctpi_state = asoc->state;
5122 info->sctpi_rwnd = asoc->a_rwnd;
5123 info->sctpi_unackdata = asoc->unack_data;
5124 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5125 info->sctpi_instrms = asoc->stream.incnt;
5126 info->sctpi_outstrms = asoc->stream.outcnt;
5127 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5128 info->sctpi_inqueue++;
5129 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5130 info->sctpi_outqueue++;
5131 info->sctpi_overall_error = asoc->overall_error_count;
5132 info->sctpi_max_burst = asoc->max_burst;
5133 info->sctpi_maxseg = asoc->frag_point;
5134 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5135 info->sctpi_peer_tag = asoc->c.peer_vtag;
5137 mask = asoc->peer.ecn_capable << 1;
5138 mask = (mask | asoc->peer.ipv4_address) << 1;
5139 mask = (mask | asoc->peer.ipv6_address) << 1;
5140 mask = (mask | asoc->peer.hostname_address) << 1;
5141 mask = (mask | asoc->peer.asconf_capable) << 1;
5142 mask = (mask | asoc->peer.prsctp_capable) << 1;
5143 mask = (mask | asoc->peer.auth_capable);
5144 info->sctpi_peer_capable = mask;
5145 mask = asoc->peer.sack_needed << 1;
5146 mask = (mask | asoc->peer.sack_generation) << 1;
5147 mask = (mask | asoc->peer.zero_window_announced);
5148 info->sctpi_peer_sack = mask;
5150 info->sctpi_isacks = asoc->stats.isacks;
5151 info->sctpi_osacks = asoc->stats.osacks;
5152 info->sctpi_opackets = asoc->stats.opackets;
5153 info->sctpi_ipackets = asoc->stats.ipackets;
5154 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5155 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5156 info->sctpi_idupchunks = asoc->stats.idupchunks;
5157 info->sctpi_gapcnt = asoc->stats.gapcnt;
5158 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5159 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5160 info->sctpi_oodchunks = asoc->stats.oodchunks;
5161 info->sctpi_iodchunks = asoc->stats.iodchunks;
5162 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5163 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5165 prim = asoc->peer.primary_path;
5166 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5167 info->sctpi_p_state = prim->state;
5168 info->sctpi_p_cwnd = prim->cwnd;
5169 info->sctpi_p_srtt = prim->srtt;
5170 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5171 info->sctpi_p_hbinterval = prim->hbinterval;
5172 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5173 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5174 info->sctpi_p_ssthresh = prim->ssthresh;
5175 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5176 info->sctpi_p_flight_size = prim->flight_size;
5177 info->sctpi_p_error = prim->error_count;
5181 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5183 /* use callback to avoid exporting the core structure */
5184 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5186 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5188 rhashtable_walk_start(iter);
5191 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5193 rhashtable_walk_stop(iter);
5194 rhashtable_walk_exit(iter);
5197 struct sctp_transport *sctp_transport_get_next(struct net *net,
5198 struct rhashtable_iter *iter)
5200 struct sctp_transport *t;
5202 t = rhashtable_walk_next(iter);
5203 for (; t; t = rhashtable_walk_next(iter)) {
5205 if (PTR_ERR(t) == -EAGAIN)
5210 if (!sctp_transport_hold(t))
5213 if (net_eq(t->asoc->base.net, net) &&
5214 t->asoc->peer.primary_path == t)
5217 sctp_transport_put(t);
5223 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5224 struct rhashtable_iter *iter,
5227 struct sctp_transport *t;
5230 return SEQ_START_TOKEN;
5232 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5235 sctp_transport_put(t);
5241 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5245 struct sctp_ep_common *epb;
5246 struct sctp_hashbucket *head;
5248 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5250 read_lock_bh(&head->lock);
5251 sctp_for_each_hentry(epb, &head->chain) {
5252 err = cb(sctp_ep(epb), p);
5256 read_unlock_bh(&head->lock);
5261 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5263 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5265 const union sctp_addr *laddr,
5266 const union sctp_addr *paddr, void *p)
5268 struct sctp_transport *transport;
5272 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5277 err = cb(transport, p);
5278 sctp_transport_put(transport);
5282 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5284 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5285 int (*cb_done)(struct sctp_transport *, void *),
5286 struct net *net, int *pos, void *p) {
5287 struct rhashtable_iter hti;
5288 struct sctp_transport *tsp;
5293 sctp_transport_walk_start(&hti);
5295 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5296 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5301 sctp_transport_put(tsp);
5303 sctp_transport_walk_stop(&hti);
5306 if (cb_done && !cb_done(tsp, p)) {
5308 sctp_transport_put(tsp);
5311 sctp_transport_put(tsp);
5316 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5318 /* 7.2.1 Association Status (SCTP_STATUS)
5320 * Applications can retrieve current status information about an
5321 * association, including association state, peer receiver window size,
5322 * number of unacked data chunks, and number of data chunks pending
5323 * receipt. This information is read-only.
5325 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5326 char __user *optval,
5329 struct sctp_status status;
5330 struct sctp_association *asoc = NULL;
5331 struct sctp_transport *transport;
5332 sctp_assoc_t associd;
5335 if (len < sizeof(status)) {
5340 len = sizeof(status);
5341 if (copy_from_user(&status, optval, len)) {
5346 associd = status.sstat_assoc_id;
5347 asoc = sctp_id2assoc(sk, associd);
5353 transport = asoc->peer.primary_path;
5355 status.sstat_assoc_id = sctp_assoc2id(asoc);
5356 status.sstat_state = sctp_assoc_to_state(asoc);
5357 status.sstat_rwnd = asoc->peer.rwnd;
5358 status.sstat_unackdata = asoc->unack_data;
5360 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5361 status.sstat_instrms = asoc->stream.incnt;
5362 status.sstat_outstrms = asoc->stream.outcnt;
5363 status.sstat_fragmentation_point = asoc->frag_point;
5364 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5365 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5366 transport->af_specific->sockaddr_len);
5367 /* Map ipv4 address into v4-mapped-on-v6 address. */
5368 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5369 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5370 status.sstat_primary.spinfo_state = transport->state;
5371 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5372 status.sstat_primary.spinfo_srtt = transport->srtt;
5373 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5374 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5376 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5377 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5379 if (put_user(len, optlen)) {
5384 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5385 __func__, len, status.sstat_state, status.sstat_rwnd,
5386 status.sstat_assoc_id);
5388 if (copy_to_user(optval, &status, len)) {
5398 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5400 * Applications can retrieve information about a specific peer address
5401 * of an association, including its reachability state, congestion
5402 * window, and retransmission timer values. This information is
5405 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5406 char __user *optval,
5409 struct sctp_paddrinfo pinfo;
5410 struct sctp_transport *transport;
5413 if (len < sizeof(pinfo)) {
5418 len = sizeof(pinfo);
5419 if (copy_from_user(&pinfo, optval, len)) {
5424 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5425 pinfo.spinfo_assoc_id);
5431 if (transport->state == SCTP_PF &&
5432 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5437 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5438 pinfo.spinfo_state = transport->state;
5439 pinfo.spinfo_cwnd = transport->cwnd;
5440 pinfo.spinfo_srtt = transport->srtt;
5441 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5442 pinfo.spinfo_mtu = transport->pathmtu;
5444 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5445 pinfo.spinfo_state = SCTP_ACTIVE;
5447 if (put_user(len, optlen)) {
5452 if (copy_to_user(optval, &pinfo, len)) {
5461 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5463 * This option is a on/off flag. If enabled no SCTP message
5464 * fragmentation will be performed. Instead if a message being sent
5465 * exceeds the current PMTU size, the message will NOT be sent and
5466 * instead a error will be indicated to the user.
5468 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5469 char __user *optval, int __user *optlen)
5473 if (len < sizeof(int))
5477 val = (sctp_sk(sk)->disable_fragments == 1);
5478 if (put_user(len, optlen))
5480 if (copy_to_user(optval, &val, len))
5485 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5487 * This socket option is used to specify various notifications and
5488 * ancillary data the user wishes to receive.
5490 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5493 struct sctp_event_subscribe subscribe;
5494 __u8 *sn_type = (__u8 *)&subscribe;
5499 if (len > sizeof(struct sctp_event_subscribe))
5500 len = sizeof(struct sctp_event_subscribe);
5501 if (put_user(len, optlen))
5504 for (i = 0; i < len; i++)
5505 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5506 SCTP_SN_TYPE_BASE + i);
5508 if (copy_to_user(optval, &subscribe, len))
5514 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5516 * This socket option is applicable to the UDP-style socket only. When
5517 * set it will cause associations that are idle for more than the
5518 * specified number of seconds to automatically close. An association
5519 * being idle is defined an association that has NOT sent or received
5520 * user data. The special value of '0' indicates that no automatic
5521 * close of any associations should be performed. The option expects an
5522 * integer defining the number of seconds of idle time before an
5523 * association is closed.
5525 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5527 /* Applicable to UDP-style socket only */
5528 if (sctp_style(sk, TCP))
5530 if (len < sizeof(int))
5533 if (put_user(len, optlen))
5535 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5540 /* Helper routine to branch off an association to a new socket. */
5541 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5543 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5544 struct sctp_sock *sp = sctp_sk(sk);
5545 struct socket *sock;
5548 /* Do not peel off from one netns to another one. */
5549 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5555 /* An association cannot be branched off from an already peeled-off
5556 * socket, nor is this supported for tcp style sockets.
5558 if (!sctp_style(sk, UDP))
5561 /* Create a new socket. */
5562 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5566 sctp_copy_sock(sock->sk, sk, asoc);
5568 /* Make peeled-off sockets more like 1-1 accepted sockets.
5569 * Set the daddr and initialize id to something more random and also
5570 * copy over any ip options.
5572 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5573 sp->pf->copy_ip_options(sk, sock->sk);
5575 /* Populate the fields of the newsk from the oldsk and migrate the
5576 * asoc to the newsk.
5578 err = sctp_sock_migrate(sk, sock->sk, asoc,
5579 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5589 EXPORT_SYMBOL(sctp_do_peeloff);
5591 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5592 struct file **newfile, unsigned flags)
5594 struct socket *newsock;
5597 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5601 /* Map the socket to an unused fd that can be returned to the user. */
5602 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5604 sock_release(newsock);
5608 *newfile = sock_alloc_file(newsock, 0, NULL);
5609 if (IS_ERR(*newfile)) {
5610 put_unused_fd(retval);
5611 retval = PTR_ERR(*newfile);
5616 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5619 peeloff->sd = retval;
5621 if (flags & SOCK_NONBLOCK)
5622 (*newfile)->f_flags |= O_NONBLOCK;
5627 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5629 sctp_peeloff_arg_t peeloff;
5630 struct file *newfile = NULL;
5633 if (len < sizeof(sctp_peeloff_arg_t))
5635 len = sizeof(sctp_peeloff_arg_t);
5636 if (copy_from_user(&peeloff, optval, len))
5639 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5643 /* Return the fd mapped to the new socket. */
5644 if (put_user(len, optlen)) {
5646 put_unused_fd(retval);
5650 if (copy_to_user(optval, &peeloff, len)) {
5652 put_unused_fd(retval);
5655 fd_install(retval, newfile);
5660 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5661 char __user *optval, int __user *optlen)
5663 sctp_peeloff_flags_arg_t peeloff;
5664 struct file *newfile = NULL;
5667 if (len < sizeof(sctp_peeloff_flags_arg_t))
5669 len = sizeof(sctp_peeloff_flags_arg_t);
5670 if (copy_from_user(&peeloff, optval, len))
5673 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5674 &newfile, peeloff.flags);
5678 /* Return the fd mapped to the new socket. */
5679 if (put_user(len, optlen)) {
5681 put_unused_fd(retval);
5685 if (copy_to_user(optval, &peeloff, len)) {
5687 put_unused_fd(retval);
5690 fd_install(retval, newfile);
5695 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5697 * Applications can enable or disable heartbeats for any peer address of
5698 * an association, modify an address's heartbeat interval, force a
5699 * heartbeat to be sent immediately, and adjust the address's maximum
5700 * number of retransmissions sent before an address is considered
5701 * unreachable. The following structure is used to access and modify an
5702 * address's parameters:
5704 * struct sctp_paddrparams {
5705 * sctp_assoc_t spp_assoc_id;
5706 * struct sockaddr_storage spp_address;
5707 * uint32_t spp_hbinterval;
5708 * uint16_t spp_pathmaxrxt;
5709 * uint32_t spp_pathmtu;
5710 * uint32_t spp_sackdelay;
5711 * uint32_t spp_flags;
5714 * spp_assoc_id - (one-to-many style socket) This is filled in the
5715 * application, and identifies the association for
5717 * spp_address - This specifies which address is of interest.
5718 * spp_hbinterval - This contains the value of the heartbeat interval,
5719 * in milliseconds. If a value of zero
5720 * is present in this field then no changes are to
5721 * be made to this parameter.
5722 * spp_pathmaxrxt - This contains the maximum number of
5723 * retransmissions before this address shall be
5724 * considered unreachable. If a value of zero
5725 * is present in this field then no changes are to
5726 * be made to this parameter.
5727 * spp_pathmtu - When Path MTU discovery is disabled the value
5728 * specified here will be the "fixed" path mtu.
5729 * Note that if the spp_address field is empty
5730 * then all associations on this address will
5731 * have this fixed path mtu set upon them.
5733 * spp_sackdelay - When delayed sack is enabled, this value specifies
5734 * the number of milliseconds that sacks will be delayed
5735 * for. This value will apply to all addresses of an
5736 * association if the spp_address field is empty. Note
5737 * also, that if delayed sack is enabled and this
5738 * value is set to 0, no change is made to the last
5739 * recorded delayed sack timer value.
5741 * spp_flags - These flags are used to control various features
5742 * on an association. The flag field may contain
5743 * zero or more of the following options.
5745 * SPP_HB_ENABLE - Enable heartbeats on the
5746 * specified address. Note that if the address
5747 * field is empty all addresses for the association
5748 * have heartbeats enabled upon them.
5750 * SPP_HB_DISABLE - Disable heartbeats on the
5751 * speicifed address. Note that if the address
5752 * field is empty all addresses for the association
5753 * will have their heartbeats disabled. Note also
5754 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5755 * mutually exclusive, only one of these two should
5756 * be specified. Enabling both fields will have
5757 * undetermined results.
5759 * SPP_HB_DEMAND - Request a user initiated heartbeat
5760 * to be made immediately.
5762 * SPP_PMTUD_ENABLE - This field will enable PMTU
5763 * discovery upon the specified address. Note that
5764 * if the address feild is empty then all addresses
5765 * on the association are effected.
5767 * SPP_PMTUD_DISABLE - This field will disable PMTU
5768 * discovery upon the specified address. Note that
5769 * if the address feild is empty then all addresses
5770 * on the association are effected. Not also that
5771 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5772 * exclusive. Enabling both will have undetermined
5775 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5776 * on delayed sack. The time specified in spp_sackdelay
5777 * is used to specify the sack delay for this address. Note
5778 * that if spp_address is empty then all addresses will
5779 * enable delayed sack and take on the sack delay
5780 * value specified in spp_sackdelay.
5781 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5782 * off delayed sack. If the spp_address field is blank then
5783 * delayed sack is disabled for the entire association. Note
5784 * also that this field is mutually exclusive to
5785 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5788 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5789 * setting of the IPV6 flow label value. The value is
5790 * contained in the spp_ipv6_flowlabel field.
5791 * Upon retrieval, this flag will be set to indicate that
5792 * the spp_ipv6_flowlabel field has a valid value returned.
5793 * If a specific destination address is set (in the
5794 * spp_address field), then the value returned is that of
5795 * the address. If just an association is specified (and
5796 * no address), then the association's default flow label
5797 * is returned. If neither an association nor a destination
5798 * is specified, then the socket's default flow label is
5799 * returned. For non-IPv6 sockets, this flag will be left
5802 * SPP_DSCP: Setting this flag enables the setting of the
5803 * Differentiated Services Code Point (DSCP) value
5804 * associated with either the association or a specific
5805 * address. The value is obtained in the spp_dscp field.
5806 * Upon retrieval, this flag will be set to indicate that
5807 * the spp_dscp field has a valid value returned. If a
5808 * specific destination address is set when called (in the
5809 * spp_address field), then that specific destination
5810 * address's DSCP value is returned. If just an association
5811 * is specified, then the association's default DSCP is
5812 * returned. If neither an association nor a destination is
5813 * specified, then the socket's default DSCP is returned.
5815 * spp_ipv6_flowlabel
5816 * - This field is used in conjunction with the
5817 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5818 * The 20 least significant bits are used for the flow
5819 * label. This setting has precedence over any IPv6-layer
5822 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5823 * and contains the DSCP. The 6 most significant bits are
5824 * used for the DSCP. This setting has precedence over any
5825 * IPv4- or IPv6- layer setting.
5827 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5828 char __user *optval, int __user *optlen)
5830 struct sctp_paddrparams params;
5831 struct sctp_transport *trans = NULL;
5832 struct sctp_association *asoc = NULL;
5833 struct sctp_sock *sp = sctp_sk(sk);
5835 if (len >= sizeof(params))
5836 len = sizeof(params);
5837 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5838 spp_ipv6_flowlabel), 4))
5839 len = ALIGN(offsetof(struct sctp_paddrparams,
5840 spp_ipv6_flowlabel), 4);
5844 if (copy_from_user(¶ms, optval, len))
5847 /* If an address other than INADDR_ANY is specified, and
5848 * no transport is found, then the request is invalid.
5850 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5851 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5852 params.spp_assoc_id);
5854 pr_debug("%s: failed no transport\n", __func__);
5859 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5860 * socket is a one to many style socket, and an association
5861 * was not found, then the id was invalid.
5863 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5864 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5865 sctp_style(sk, UDP)) {
5866 pr_debug("%s: failed no association\n", __func__);
5871 /* Fetch transport values. */
5872 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5873 params.spp_pathmtu = trans->pathmtu;
5874 params.spp_pathmaxrxt = trans->pathmaxrxt;
5875 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5877 /*draft-11 doesn't say what to return in spp_flags*/
5878 params.spp_flags = trans->param_flags;
5879 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5880 params.spp_ipv6_flowlabel = trans->flowlabel &
5881 SCTP_FLOWLABEL_VAL_MASK;
5882 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5884 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5885 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5886 params.spp_flags |= SPP_DSCP;
5889 /* Fetch association values. */
5890 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5891 params.spp_pathmtu = asoc->pathmtu;
5892 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5893 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5895 /*draft-11 doesn't say what to return in spp_flags*/
5896 params.spp_flags = asoc->param_flags;
5897 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5898 params.spp_ipv6_flowlabel = asoc->flowlabel &
5899 SCTP_FLOWLABEL_VAL_MASK;
5900 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5902 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5903 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5904 params.spp_flags |= SPP_DSCP;
5907 /* Fetch socket values. */
5908 params.spp_hbinterval = sp->hbinterval;
5909 params.spp_pathmtu = sp->pathmtu;
5910 params.spp_sackdelay = sp->sackdelay;
5911 params.spp_pathmaxrxt = sp->pathmaxrxt;
5913 /*draft-11 doesn't say what to return in spp_flags*/
5914 params.spp_flags = sp->param_flags;
5915 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5916 params.spp_ipv6_flowlabel = sp->flowlabel &
5917 SCTP_FLOWLABEL_VAL_MASK;
5918 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5920 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5921 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5922 params.spp_flags |= SPP_DSCP;
5926 if (copy_to_user(optval, ¶ms, len))
5929 if (put_user(len, optlen))
5936 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
5938 * This option will effect the way delayed acks are performed. This
5939 * option allows you to get or set the delayed ack time, in
5940 * milliseconds. It also allows changing the delayed ack frequency.
5941 * Changing the frequency to 1 disables the delayed sack algorithm. If
5942 * the assoc_id is 0, then this sets or gets the endpoints default
5943 * values. If the assoc_id field is non-zero, then the set or get
5944 * effects the specified association for the one to many model (the
5945 * assoc_id field is ignored by the one to one model). Note that if
5946 * sack_delay or sack_freq are 0 when setting this option, then the
5947 * current values will remain unchanged.
5949 * struct sctp_sack_info {
5950 * sctp_assoc_t sack_assoc_id;
5951 * uint32_t sack_delay;
5952 * uint32_t sack_freq;
5955 * sack_assoc_id - This parameter, indicates which association the user
5956 * is performing an action upon. Note that if this field's value is
5957 * zero then the endpoints default value is changed (effecting future
5958 * associations only).
5960 * sack_delay - This parameter contains the number of milliseconds that
5961 * the user is requesting the delayed ACK timer be set to. Note that
5962 * this value is defined in the standard to be between 200 and 500
5965 * sack_freq - This parameter contains the number of packets that must
5966 * be received before a sack is sent without waiting for the delay
5967 * timer to expire. The default value for this is 2, setting this
5968 * value to 1 will disable the delayed sack algorithm.
5970 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5971 char __user *optval,
5974 struct sctp_sack_info params;
5975 struct sctp_association *asoc = NULL;
5976 struct sctp_sock *sp = sctp_sk(sk);
5978 if (len >= sizeof(struct sctp_sack_info)) {
5979 len = sizeof(struct sctp_sack_info);
5981 if (copy_from_user(¶ms, optval, len))
5983 } else if (len == sizeof(struct sctp_assoc_value)) {
5984 pr_warn_ratelimited(DEPRECATED
5986 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5987 "Use struct sctp_sack_info instead\n",
5988 current->comm, task_pid_nr(current));
5989 if (copy_from_user(¶ms, optval, len))
5994 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
5995 * socket is a one to many style socket, and an association
5996 * was not found, then the id was invalid.
5998 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5999 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6000 sctp_style(sk, UDP))
6004 /* Fetch association values. */
6005 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6006 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6007 params.sack_freq = asoc->sackfreq;
6010 params.sack_delay = 0;
6011 params.sack_freq = 1;
6014 /* Fetch socket values. */
6015 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6016 params.sack_delay = sp->sackdelay;
6017 params.sack_freq = sp->sackfreq;
6019 params.sack_delay = 0;
6020 params.sack_freq = 1;
6024 if (copy_to_user(optval, ¶ms, len))
6027 if (put_user(len, optlen))
6033 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6035 * Applications can specify protocol parameters for the default association
6036 * initialization. The option name argument to setsockopt() and getsockopt()
6039 * Setting initialization parameters is effective only on an unconnected
6040 * socket (for UDP-style sockets only future associations are effected
6041 * by the change). With TCP-style sockets, this option is inherited by
6042 * sockets derived from a listener socket.
6044 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6046 if (len < sizeof(struct sctp_initmsg))
6048 len = sizeof(struct sctp_initmsg);
6049 if (put_user(len, optlen))
6051 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6057 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6058 char __user *optval, int __user *optlen)
6060 struct sctp_association *asoc;
6062 struct sctp_getaddrs getaddrs;
6063 struct sctp_transport *from;
6065 union sctp_addr temp;
6066 struct sctp_sock *sp = sctp_sk(sk);
6071 if (len < sizeof(struct sctp_getaddrs))
6074 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6077 /* For UDP-style sockets, id specifies the association to query. */
6078 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6082 to = optval + offsetof(struct sctp_getaddrs, addrs);
6083 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6085 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6087 memcpy(&temp, &from->ipaddr, sizeof(temp));
6088 addrlen = sctp_get_pf_specific(sk->sk_family)
6089 ->addr_to_user(sp, &temp);
6090 if (space_left < addrlen)
6092 if (copy_to_user(to, &temp, addrlen))
6096 space_left -= addrlen;
6099 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6101 bytes_copied = ((char __user *)to) - optval;
6102 if (put_user(bytes_copied, optlen))
6108 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6109 size_t space_left, int *bytes_copied)
6111 struct sctp_sockaddr_entry *addr;
6112 union sctp_addr temp;
6115 struct net *net = sock_net(sk);
6118 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6122 if ((PF_INET == sk->sk_family) &&
6123 (AF_INET6 == addr->a.sa.sa_family))
6125 if ((PF_INET6 == sk->sk_family) &&
6126 inet_v6_ipv6only(sk) &&
6127 (AF_INET == addr->a.sa.sa_family))
6129 memcpy(&temp, &addr->a, sizeof(temp));
6130 if (!temp.v4.sin_port)
6131 temp.v4.sin_port = htons(port);
6133 addrlen = sctp_get_pf_specific(sk->sk_family)
6134 ->addr_to_user(sctp_sk(sk), &temp);
6136 if (space_left < addrlen) {
6140 memcpy(to, &temp, addrlen);
6144 space_left -= addrlen;
6145 *bytes_copied += addrlen;
6153 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6154 char __user *optval, int __user *optlen)
6156 struct sctp_bind_addr *bp;
6157 struct sctp_association *asoc;
6159 struct sctp_getaddrs getaddrs;
6160 struct sctp_sockaddr_entry *addr;
6162 union sctp_addr temp;
6163 struct sctp_sock *sp = sctp_sk(sk);
6167 int bytes_copied = 0;
6171 if (len < sizeof(struct sctp_getaddrs))
6174 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6178 * For UDP-style sockets, id specifies the association to query.
6179 * If the id field is set to the value '0' then the locally bound
6180 * addresses are returned without regard to any particular
6183 if (0 == getaddrs.assoc_id) {
6184 bp = &sctp_sk(sk)->ep->base.bind_addr;
6186 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6189 bp = &asoc->base.bind_addr;
6192 to = optval + offsetof(struct sctp_getaddrs, addrs);
6193 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6195 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6199 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6200 * addresses from the global local address list.
6202 if (sctp_list_single_entry(&bp->address_list)) {
6203 addr = list_entry(bp->address_list.next,
6204 struct sctp_sockaddr_entry, list);
6205 if (sctp_is_any(sk, &addr->a)) {
6206 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6207 space_left, &bytes_copied);
6217 /* Protection on the bound address list is not needed since
6218 * in the socket option context we hold a socket lock and
6219 * thus the bound address list can't change.
6221 list_for_each_entry(addr, &bp->address_list, list) {
6222 memcpy(&temp, &addr->a, sizeof(temp));
6223 addrlen = sctp_get_pf_specific(sk->sk_family)
6224 ->addr_to_user(sp, &temp);
6225 if (space_left < addrlen) {
6226 err = -ENOMEM; /*fixme: right error?*/
6229 memcpy(buf, &temp, addrlen);
6231 bytes_copied += addrlen;
6233 space_left -= addrlen;
6237 if (copy_to_user(to, addrs, bytes_copied)) {
6241 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6245 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6246 * but we can't change it anymore.
6248 if (put_user(bytes_copied, optlen))
6255 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6257 * Requests that the local SCTP stack use the enclosed peer address as
6258 * the association primary. The enclosed address must be one of the
6259 * association peer's addresses.
6261 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6262 char __user *optval, int __user *optlen)
6264 struct sctp_prim prim;
6265 struct sctp_association *asoc;
6266 struct sctp_sock *sp = sctp_sk(sk);
6268 if (len < sizeof(struct sctp_prim))
6271 len = sizeof(struct sctp_prim);
6273 if (copy_from_user(&prim, optval, len))
6276 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6280 if (!asoc->peer.primary_path)
6283 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6284 asoc->peer.primary_path->af_specific->sockaddr_len);
6286 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6287 (union sctp_addr *)&prim.ssp_addr);
6289 if (put_user(len, optlen))
6291 if (copy_to_user(optval, &prim, len))
6298 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6300 * Requests that the local endpoint set the specified Adaptation Layer
6301 * Indication parameter for all future INIT and INIT-ACK exchanges.
6303 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6304 char __user *optval, int __user *optlen)
6306 struct sctp_setadaptation adaptation;
6308 if (len < sizeof(struct sctp_setadaptation))
6311 len = sizeof(struct sctp_setadaptation);
6313 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6315 if (put_user(len, optlen))
6317 if (copy_to_user(optval, &adaptation, len))
6325 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6327 * Applications that wish to use the sendto() system call may wish to
6328 * specify a default set of parameters that would normally be supplied
6329 * through the inclusion of ancillary data. This socket option allows
6330 * such an application to set the default sctp_sndrcvinfo structure.
6333 * The application that wishes to use this socket option simply passes
6334 * in to this call the sctp_sndrcvinfo structure defined in Section
6335 * 5.2.2) The input parameters accepted by this call include
6336 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6337 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6338 * to this call if the caller is using the UDP model.
6340 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6342 static int sctp_getsockopt_default_send_param(struct sock *sk,
6343 int len, char __user *optval,
6346 struct sctp_sock *sp = sctp_sk(sk);
6347 struct sctp_association *asoc;
6348 struct sctp_sndrcvinfo info;
6350 if (len < sizeof(info))
6355 if (copy_from_user(&info, optval, len))
6358 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6359 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6360 sctp_style(sk, UDP))
6364 info.sinfo_stream = asoc->default_stream;
6365 info.sinfo_flags = asoc->default_flags;
6366 info.sinfo_ppid = asoc->default_ppid;
6367 info.sinfo_context = asoc->default_context;
6368 info.sinfo_timetolive = asoc->default_timetolive;
6370 info.sinfo_stream = sp->default_stream;
6371 info.sinfo_flags = sp->default_flags;
6372 info.sinfo_ppid = sp->default_ppid;
6373 info.sinfo_context = sp->default_context;
6374 info.sinfo_timetolive = sp->default_timetolive;
6377 if (put_user(len, optlen))
6379 if (copy_to_user(optval, &info, len))
6385 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6386 * (SCTP_DEFAULT_SNDINFO)
6388 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6389 char __user *optval,
6392 struct sctp_sock *sp = sctp_sk(sk);
6393 struct sctp_association *asoc;
6394 struct sctp_sndinfo info;
6396 if (len < sizeof(info))
6401 if (copy_from_user(&info, optval, len))
6404 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6405 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6406 sctp_style(sk, UDP))
6410 info.snd_sid = asoc->default_stream;
6411 info.snd_flags = asoc->default_flags;
6412 info.snd_ppid = asoc->default_ppid;
6413 info.snd_context = asoc->default_context;
6415 info.snd_sid = sp->default_stream;
6416 info.snd_flags = sp->default_flags;
6417 info.snd_ppid = sp->default_ppid;
6418 info.snd_context = sp->default_context;
6421 if (put_user(len, optlen))
6423 if (copy_to_user(optval, &info, len))
6431 * 7.1.5 SCTP_NODELAY
6433 * Turn on/off any Nagle-like algorithm. This means that packets are
6434 * generally sent as soon as possible and no unnecessary delays are
6435 * introduced, at the cost of more packets in the network. Expects an
6436 * integer boolean flag.
6439 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6440 char __user *optval, int __user *optlen)
6444 if (len < sizeof(int))
6448 val = (sctp_sk(sk)->nodelay == 1);
6449 if (put_user(len, optlen))
6451 if (copy_to_user(optval, &val, len))
6458 * 7.1.1 SCTP_RTOINFO
6460 * The protocol parameters used to initialize and bound retransmission
6461 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6462 * and modify these parameters.
6463 * All parameters are time values, in milliseconds. A value of 0, when
6464 * modifying the parameters, indicates that the current value should not
6468 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6469 char __user *optval,
6470 int __user *optlen) {
6471 struct sctp_rtoinfo rtoinfo;
6472 struct sctp_association *asoc;
6474 if (len < sizeof (struct sctp_rtoinfo))
6477 len = sizeof(struct sctp_rtoinfo);
6479 if (copy_from_user(&rtoinfo, optval, len))
6482 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6484 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6485 sctp_style(sk, UDP))
6488 /* Values corresponding to the specific association. */
6490 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6491 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6492 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6494 /* Values corresponding to the endpoint. */
6495 struct sctp_sock *sp = sctp_sk(sk);
6497 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6498 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6499 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6502 if (put_user(len, optlen))
6505 if (copy_to_user(optval, &rtoinfo, len))
6513 * 7.1.2 SCTP_ASSOCINFO
6515 * This option is used to tune the maximum retransmission attempts
6516 * of the association.
6517 * Returns an error if the new association retransmission value is
6518 * greater than the sum of the retransmission value of the peer.
6519 * See [SCTP] for more information.
6522 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6523 char __user *optval,
6527 struct sctp_assocparams assocparams;
6528 struct sctp_association *asoc;
6529 struct list_head *pos;
6532 if (len < sizeof (struct sctp_assocparams))
6535 len = sizeof(struct sctp_assocparams);
6537 if (copy_from_user(&assocparams, optval, len))
6540 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6542 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6543 sctp_style(sk, UDP))
6546 /* Values correspoinding to the specific association */
6548 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6549 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6550 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6551 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6553 list_for_each(pos, &asoc->peer.transport_addr_list) {
6557 assocparams.sasoc_number_peer_destinations = cnt;
6559 /* Values corresponding to the endpoint */
6560 struct sctp_sock *sp = sctp_sk(sk);
6562 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6563 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6564 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6565 assocparams.sasoc_cookie_life =
6566 sp->assocparams.sasoc_cookie_life;
6567 assocparams.sasoc_number_peer_destinations =
6569 sasoc_number_peer_destinations;
6572 if (put_user(len, optlen))
6575 if (copy_to_user(optval, &assocparams, len))
6582 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6584 * This socket option is a boolean flag which turns on or off mapped V4
6585 * addresses. If this option is turned on and the socket is type
6586 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6587 * If this option is turned off, then no mapping will be done of V4
6588 * addresses and a user will receive both PF_INET6 and PF_INET type
6589 * addresses on the socket.
6591 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6592 char __user *optval, int __user *optlen)
6595 struct sctp_sock *sp = sctp_sk(sk);
6597 if (len < sizeof(int))
6602 if (put_user(len, optlen))
6604 if (copy_to_user(optval, &val, len))
6611 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6612 * (chapter and verse is quoted at sctp_setsockopt_context())
6614 static int sctp_getsockopt_context(struct sock *sk, int len,
6615 char __user *optval, int __user *optlen)
6617 struct sctp_assoc_value params;
6618 struct sctp_association *asoc;
6620 if (len < sizeof(struct sctp_assoc_value))
6623 len = sizeof(struct sctp_assoc_value);
6625 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))
6633 params.assoc_value = asoc ? asoc->default_rcv_context
6634 : sctp_sk(sk)->default_rcv_context;
6636 if (put_user(len, optlen))
6638 if (copy_to_user(optval, ¶ms, len))
6645 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6646 * This option will get or set the maximum size to put in any outgoing
6647 * SCTP DATA chunk. If a message is larger than this size it will be
6648 * fragmented by SCTP into the specified size. Note that the underlying
6649 * SCTP implementation may fragment into smaller sized chunks when the
6650 * PMTU of the underlying association is smaller than the value set by
6651 * the user. The default value for this option is '0' which indicates
6652 * the user is NOT limiting fragmentation and only the PMTU will effect
6653 * SCTP's choice of DATA chunk size. Note also that values set larger
6654 * than the maximum size of an IP datagram will effectively let SCTP
6655 * control fragmentation (i.e. the same as setting this option to 0).
6657 * The following structure is used to access and modify this parameter:
6659 * struct sctp_assoc_value {
6660 * sctp_assoc_t assoc_id;
6661 * uint32_t assoc_value;
6664 * assoc_id: This parameter is ignored for one-to-one style sockets.
6665 * For one-to-many style sockets this parameter indicates which
6666 * association the user is performing an action upon. Note that if
6667 * this field's value is zero then the endpoints default value is
6668 * changed (effecting future associations only).
6669 * assoc_value: This parameter specifies the maximum size in bytes.
6671 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6672 char __user *optval, int __user *optlen)
6674 struct sctp_assoc_value params;
6675 struct sctp_association *asoc;
6677 if (len == sizeof(int)) {
6678 pr_warn_ratelimited(DEPRECATED
6680 "Use of int in maxseg socket option.\n"
6681 "Use struct sctp_assoc_value instead\n",
6682 current->comm, task_pid_nr(current));
6683 params.assoc_id = SCTP_FUTURE_ASSOC;
6684 } else if (len >= sizeof(struct sctp_assoc_value)) {
6685 len = sizeof(struct sctp_assoc_value);
6686 if (copy_from_user(¶ms, optval, len))
6691 asoc = sctp_id2assoc(sk, params.assoc_id);
6692 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6693 sctp_style(sk, UDP))
6697 params.assoc_value = asoc->frag_point;
6699 params.assoc_value = sctp_sk(sk)->user_frag;
6701 if (put_user(len, optlen))
6703 if (len == sizeof(int)) {
6704 if (copy_to_user(optval, ¶ms.assoc_value, len))
6707 if (copy_to_user(optval, ¶ms, len))
6715 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6716 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6718 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6719 char __user *optval, int __user *optlen)
6723 if (len < sizeof(int))
6728 val = sctp_sk(sk)->frag_interleave;
6729 if (put_user(len, optlen))
6731 if (copy_to_user(optval, &val, len))
6738 * 7.1.25. Set or Get the sctp partial delivery point
6739 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6741 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6742 char __user *optval,
6747 if (len < sizeof(u32))
6752 val = sctp_sk(sk)->pd_point;
6753 if (put_user(len, optlen))
6755 if (copy_to_user(optval, &val, len))
6762 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6763 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6765 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6766 char __user *optval,
6769 struct sctp_assoc_value params;
6770 struct sctp_association *asoc;
6772 if (len == sizeof(int)) {
6773 pr_warn_ratelimited(DEPRECATED
6775 "Use of int in max_burst socket option.\n"
6776 "Use struct sctp_assoc_value instead\n",
6777 current->comm, task_pid_nr(current));
6778 params.assoc_id = SCTP_FUTURE_ASSOC;
6779 } else if (len >= sizeof(struct sctp_assoc_value)) {
6780 len = sizeof(struct sctp_assoc_value);
6781 if (copy_from_user(¶ms, optval, len))
6786 asoc = sctp_id2assoc(sk, params.assoc_id);
6787 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6788 sctp_style(sk, UDP))
6791 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6793 if (len == sizeof(int)) {
6794 if (copy_to_user(optval, ¶ms.assoc_value, len))
6797 if (copy_to_user(optval, ¶ms, len))
6805 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6806 char __user *optval, int __user *optlen)
6808 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6809 struct sctp_hmacalgo __user *p = (void __user *)optval;
6810 struct sctp_hmac_algo_param *hmacs;
6815 if (!ep->auth_enable)
6818 hmacs = ep->auth_hmacs_list;
6819 data_len = ntohs(hmacs->param_hdr.length) -
6820 sizeof(struct sctp_paramhdr);
6822 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6825 len = sizeof(struct sctp_hmacalgo) + data_len;
6826 num_idents = data_len / sizeof(u16);
6828 if (put_user(len, optlen))
6830 if (put_user(num_idents, &p->shmac_num_idents))
6832 for (i = 0; i < num_idents; i++) {
6833 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6835 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6841 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6842 char __user *optval, int __user *optlen)
6844 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6845 struct sctp_authkeyid val;
6846 struct sctp_association *asoc;
6848 if (len < sizeof(struct sctp_authkeyid))
6851 len = sizeof(struct sctp_authkeyid);
6852 if (copy_from_user(&val, optval, len))
6855 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6856 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6860 if (!asoc->peer.auth_capable)
6862 val.scact_keynumber = asoc->active_key_id;
6864 if (!ep->auth_enable)
6866 val.scact_keynumber = ep->active_key_id;
6869 if (put_user(len, optlen))
6871 if (copy_to_user(optval, &val, len))
6877 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6878 char __user *optval, int __user *optlen)
6880 struct sctp_authchunks __user *p = (void __user *)optval;
6881 struct sctp_authchunks val;
6882 struct sctp_association *asoc;
6883 struct sctp_chunks_param *ch;
6887 if (len < sizeof(struct sctp_authchunks))
6890 if (copy_from_user(&val, optval, sizeof(val)))
6893 to = p->gauth_chunks;
6894 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6898 if (!asoc->peer.auth_capable)
6901 ch = asoc->peer.peer_chunks;
6905 /* See if the user provided enough room for all the data */
6906 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6907 if (len < num_chunks)
6910 if (copy_to_user(to, ch->chunks, num_chunks))
6913 len = sizeof(struct sctp_authchunks) + num_chunks;
6914 if (put_user(len, optlen))
6916 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6921 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
6922 char __user *optval, int __user *optlen)
6924 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6925 struct sctp_authchunks __user *p = (void __user *)optval;
6926 struct sctp_authchunks val;
6927 struct sctp_association *asoc;
6928 struct sctp_chunks_param *ch;
6932 if (len < sizeof(struct sctp_authchunks))
6935 if (copy_from_user(&val, optval, sizeof(val)))
6938 to = p->gauth_chunks;
6939 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6940 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
6941 sctp_style(sk, UDP))
6945 if (!asoc->peer.auth_capable)
6947 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6949 if (!ep->auth_enable)
6951 ch = ep->auth_chunk_list;
6956 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6957 if (len < sizeof(struct sctp_authchunks) + num_chunks)
6960 if (copy_to_user(to, ch->chunks, num_chunks))
6963 len = sizeof(struct sctp_authchunks) + num_chunks;
6964 if (put_user(len, optlen))
6966 if (put_user(num_chunks, &p->gauth_number_of_chunks))
6973 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
6974 * This option gets the current number of associations that are attached
6975 * to a one-to-many style socket. The option value is an uint32_t.
6977 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
6978 char __user *optval, int __user *optlen)
6980 struct sctp_sock *sp = sctp_sk(sk);
6981 struct sctp_association *asoc;
6984 if (sctp_style(sk, TCP))
6987 if (len < sizeof(u32))
6992 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
6996 if (put_user(len, optlen))
6998 if (copy_to_user(optval, &val, len))
7005 * 8.1.23 SCTP_AUTO_ASCONF
7006 * See the corresponding setsockopt entry as description
7008 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7009 char __user *optval, int __user *optlen)
7013 if (len < sizeof(int))
7017 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7019 if (put_user(len, optlen))
7021 if (copy_to_user(optval, &val, len))
7027 * 8.2.6. Get the Current Identifiers of Associations
7028 * (SCTP_GET_ASSOC_ID_LIST)
7030 * This option gets the current list of SCTP association identifiers of
7031 * the SCTP associations handled by a one-to-many style socket.
7033 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7034 char __user *optval, int __user *optlen)
7036 struct sctp_sock *sp = sctp_sk(sk);
7037 struct sctp_association *asoc;
7038 struct sctp_assoc_ids *ids;
7041 if (sctp_style(sk, TCP))
7044 if (len < sizeof(struct sctp_assoc_ids))
7047 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7051 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7054 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7056 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7060 ids->gaids_number_of_ids = num;
7062 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7063 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7066 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7076 * SCTP_PEER_ADDR_THLDS
7078 * This option allows us to fetch the partially failed threshold for one or all
7079 * transports in an association. See Section 6.1 of:
7080 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7082 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7083 char __user *optval, int len,
7084 int __user *optlen, bool v2)
7086 struct sctp_paddrthlds_v2 val;
7087 struct sctp_transport *trans;
7088 struct sctp_association *asoc;
7091 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7095 if (copy_from_user(&val, optval, len))
7098 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7099 trans = sctp_addr_id2transport(sk, &val.spt_address,
7104 val.spt_pathmaxrxt = trans->pathmaxrxt;
7105 val.spt_pathpfthld = trans->pf_retrans;
7106 val.spt_pathcpthld = trans->ps_retrans;
7111 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7112 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7113 sctp_style(sk, UDP))
7117 val.spt_pathpfthld = asoc->pf_retrans;
7118 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7119 val.spt_pathcpthld = asoc->ps_retrans;
7121 struct sctp_sock *sp = sctp_sk(sk);
7123 val.spt_pathpfthld = sp->pf_retrans;
7124 val.spt_pathmaxrxt = sp->pathmaxrxt;
7125 val.spt_pathcpthld = sp->ps_retrans;
7129 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7136 * SCTP_GET_ASSOC_STATS
7138 * This option retrieves local per endpoint statistics. It is modeled
7139 * after OpenSolaris' implementation
7141 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7142 char __user *optval,
7145 struct sctp_assoc_stats sas;
7146 struct sctp_association *asoc = NULL;
7148 /* User must provide at least the assoc id */
7149 if (len < sizeof(sctp_assoc_t))
7152 /* Allow the struct to grow and fill in as much as possible */
7153 len = min_t(size_t, len, sizeof(sas));
7155 if (copy_from_user(&sas, optval, len))
7158 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7162 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7163 sas.sas_gapcnt = asoc->stats.gapcnt;
7164 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7165 sas.sas_osacks = asoc->stats.osacks;
7166 sas.sas_isacks = asoc->stats.isacks;
7167 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7168 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7169 sas.sas_oodchunks = asoc->stats.oodchunks;
7170 sas.sas_iodchunks = asoc->stats.iodchunks;
7171 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7172 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7173 sas.sas_idupchunks = asoc->stats.idupchunks;
7174 sas.sas_opackets = asoc->stats.opackets;
7175 sas.sas_ipackets = asoc->stats.ipackets;
7177 /* New high max rto observed, will return 0 if not a single
7178 * RTO update took place. obs_rto_ipaddr will be bogus
7181 sas.sas_maxrto = asoc->stats.max_obs_rto;
7182 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7183 sizeof(struct sockaddr_storage));
7185 /* Mark beginning of a new observation period */
7186 asoc->stats.max_obs_rto = asoc->rto_min;
7188 if (put_user(len, optlen))
7191 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7193 if (copy_to_user(optval, &sas, len))
7199 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7200 char __user *optval,
7205 if (len < sizeof(int))
7209 if (sctp_sk(sk)->recvrcvinfo)
7211 if (put_user(len, optlen))
7213 if (copy_to_user(optval, &val, len))
7219 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7220 char __user *optval,
7225 if (len < sizeof(int))
7229 if (sctp_sk(sk)->recvnxtinfo)
7231 if (put_user(len, optlen))
7233 if (copy_to_user(optval, &val, len))
7239 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7240 char __user *optval,
7243 struct sctp_assoc_value params;
7244 struct sctp_association *asoc;
7245 int retval = -EFAULT;
7247 if (len < sizeof(params)) {
7252 len = sizeof(params);
7253 if (copy_from_user(¶ms, optval, len))
7256 asoc = sctp_id2assoc(sk, params.assoc_id);
7257 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7258 sctp_style(sk, UDP)) {
7263 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7264 : sctp_sk(sk)->ep->prsctp_enable;
7266 if (put_user(len, optlen))
7269 if (copy_to_user(optval, ¶ms, len))
7278 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7279 char __user *optval,
7282 struct sctp_default_prinfo info;
7283 struct sctp_association *asoc;
7284 int retval = -EFAULT;
7286 if (len < sizeof(info)) {
7292 if (copy_from_user(&info, optval, len))
7295 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7296 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7297 sctp_style(sk, UDP)) {
7303 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7304 info.pr_value = asoc->default_timetolive;
7306 struct sctp_sock *sp = sctp_sk(sk);
7308 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7309 info.pr_value = sp->default_timetolive;
7312 if (put_user(len, optlen))
7315 if (copy_to_user(optval, &info, len))
7324 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7325 char __user *optval,
7328 struct sctp_prstatus params;
7329 struct sctp_association *asoc;
7331 int retval = -EINVAL;
7333 if (len < sizeof(params))
7336 len = sizeof(params);
7337 if (copy_from_user(¶ms, optval, len)) {
7342 policy = params.sprstat_policy;
7343 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7344 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7347 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7351 if (policy == SCTP_PR_SCTP_ALL) {
7352 params.sprstat_abandoned_unsent = 0;
7353 params.sprstat_abandoned_sent = 0;
7354 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7355 params.sprstat_abandoned_unsent +=
7356 asoc->abandoned_unsent[policy];
7357 params.sprstat_abandoned_sent +=
7358 asoc->abandoned_sent[policy];
7361 params.sprstat_abandoned_unsent =
7362 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7363 params.sprstat_abandoned_sent =
7364 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7367 if (put_user(len, optlen)) {
7372 if (copy_to_user(optval, ¶ms, len)) {
7383 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7384 char __user *optval,
7387 struct sctp_stream_out_ext *streamoute;
7388 struct sctp_association *asoc;
7389 struct sctp_prstatus params;
7390 int retval = -EINVAL;
7393 if (len < sizeof(params))
7396 len = sizeof(params);
7397 if (copy_from_user(¶ms, optval, len)) {
7402 policy = params.sprstat_policy;
7403 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7404 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7407 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7408 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7411 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7413 /* Not allocated yet, means all stats are 0 */
7414 params.sprstat_abandoned_unsent = 0;
7415 params.sprstat_abandoned_sent = 0;
7420 if (policy == SCTP_PR_SCTP_ALL) {
7421 params.sprstat_abandoned_unsent = 0;
7422 params.sprstat_abandoned_sent = 0;
7423 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7424 params.sprstat_abandoned_unsent +=
7425 streamoute->abandoned_unsent[policy];
7426 params.sprstat_abandoned_sent +=
7427 streamoute->abandoned_sent[policy];
7430 params.sprstat_abandoned_unsent =
7431 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7432 params.sprstat_abandoned_sent =
7433 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7436 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7447 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7448 char __user *optval,
7451 struct sctp_assoc_value params;
7452 struct sctp_association *asoc;
7453 int retval = -EFAULT;
7455 if (len < sizeof(params)) {
7460 len = sizeof(params);
7461 if (copy_from_user(¶ms, optval, len))
7464 asoc = sctp_id2assoc(sk, params.assoc_id);
7465 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7466 sctp_style(sk, UDP)) {
7471 params.assoc_value = asoc ? asoc->peer.reconf_capable
7472 : sctp_sk(sk)->ep->reconf_enable;
7474 if (put_user(len, optlen))
7477 if (copy_to_user(optval, ¶ms, len))
7486 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7487 char __user *optval,
7490 struct sctp_assoc_value params;
7491 struct sctp_association *asoc;
7492 int retval = -EFAULT;
7494 if (len < sizeof(params)) {
7499 len = sizeof(params);
7500 if (copy_from_user(¶ms, optval, len))
7503 asoc = sctp_id2assoc(sk, params.assoc_id);
7504 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7505 sctp_style(sk, UDP)) {
7510 params.assoc_value = asoc ? asoc->strreset_enable
7511 : sctp_sk(sk)->ep->strreset_enable;
7513 if (put_user(len, optlen))
7516 if (copy_to_user(optval, ¶ms, len))
7525 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7526 char __user *optval,
7529 struct sctp_assoc_value params;
7530 struct sctp_association *asoc;
7531 int retval = -EFAULT;
7533 if (len < sizeof(params)) {
7538 len = sizeof(params);
7539 if (copy_from_user(¶ms, optval, len))
7542 asoc = sctp_id2assoc(sk, params.assoc_id);
7543 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7544 sctp_style(sk, UDP)) {
7549 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7550 : sctp_sk(sk)->default_ss;
7552 if (put_user(len, optlen))
7555 if (copy_to_user(optval, ¶ms, len))
7564 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7565 char __user *optval,
7568 struct sctp_stream_value params;
7569 struct sctp_association *asoc;
7570 int retval = -EFAULT;
7572 if (len < sizeof(params)) {
7577 len = sizeof(params);
7578 if (copy_from_user(¶ms, optval, len))
7581 asoc = sctp_id2assoc(sk, params.assoc_id);
7587 retval = sctp_sched_get_value(asoc, params.stream_id,
7588 ¶ms.stream_value);
7592 if (put_user(len, optlen)) {
7597 if (copy_to_user(optval, ¶ms, len)) {
7606 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7607 char __user *optval,
7610 struct sctp_assoc_value params;
7611 struct sctp_association *asoc;
7612 int retval = -EFAULT;
7614 if (len < sizeof(params)) {
7619 len = sizeof(params);
7620 if (copy_from_user(¶ms, optval, len))
7623 asoc = sctp_id2assoc(sk, params.assoc_id);
7624 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7625 sctp_style(sk, UDP)) {
7630 params.assoc_value = asoc ? asoc->peer.intl_capable
7631 : sctp_sk(sk)->ep->intl_enable;
7633 if (put_user(len, optlen))
7636 if (copy_to_user(optval, ¶ms, len))
7645 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7646 char __user *optval,
7651 if (len < sizeof(int))
7655 val = sctp_sk(sk)->reuse;
7656 if (put_user(len, optlen))
7659 if (copy_to_user(optval, &val, len))
7665 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7668 struct sctp_association *asoc;
7669 struct sctp_event param;
7672 if (len < sizeof(param))
7675 len = sizeof(param);
7676 if (copy_from_user(¶m, optval, len))
7679 if (param.se_type < SCTP_SN_TYPE_BASE ||
7680 param.se_type > SCTP_SN_TYPE_MAX)
7683 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7684 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7685 sctp_style(sk, UDP))
7688 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7689 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7691 if (put_user(len, optlen))
7694 if (copy_to_user(optval, ¶m, len))
7700 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7701 char __user *optval,
7704 struct sctp_assoc_value params;
7705 struct sctp_association *asoc;
7706 int retval = -EFAULT;
7708 if (len < sizeof(params)) {
7713 len = sizeof(params);
7714 if (copy_from_user(¶ms, optval, len))
7717 asoc = sctp_id2assoc(sk, params.assoc_id);
7718 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7719 sctp_style(sk, UDP)) {
7724 params.assoc_value = asoc ? asoc->peer.asconf_capable
7725 : sctp_sk(sk)->ep->asconf_enable;
7727 if (put_user(len, optlen))
7730 if (copy_to_user(optval, ¶ms, len))
7739 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7740 char __user *optval,
7743 struct sctp_assoc_value params;
7744 struct sctp_association *asoc;
7745 int retval = -EFAULT;
7747 if (len < sizeof(params)) {
7752 len = sizeof(params);
7753 if (copy_from_user(¶ms, optval, len))
7756 asoc = sctp_id2assoc(sk, params.assoc_id);
7757 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7758 sctp_style(sk, UDP)) {
7763 params.assoc_value = asoc ? asoc->peer.auth_capable
7764 : sctp_sk(sk)->ep->auth_enable;
7766 if (put_user(len, optlen))
7769 if (copy_to_user(optval, ¶ms, len))
7778 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7779 char __user *optval,
7782 struct sctp_assoc_value params;
7783 struct sctp_association *asoc;
7784 int retval = -EFAULT;
7786 if (len < sizeof(params)) {
7791 len = sizeof(params);
7792 if (copy_from_user(¶ms, optval, len))
7795 asoc = sctp_id2assoc(sk, params.assoc_id);
7796 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7797 sctp_style(sk, UDP)) {
7802 params.assoc_value = asoc ? asoc->peer.ecn_capable
7803 : sctp_sk(sk)->ep->ecn_enable;
7805 if (put_user(len, optlen))
7808 if (copy_to_user(optval, ¶ms, len))
7817 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7818 char __user *optval,
7821 struct sctp_assoc_value params;
7822 struct sctp_association *asoc;
7823 int retval = -EFAULT;
7825 if (len < sizeof(params)) {
7830 len = sizeof(params);
7831 if (copy_from_user(¶ms, optval, len))
7834 asoc = sctp_id2assoc(sk, params.assoc_id);
7835 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7836 sctp_style(sk, UDP)) {
7841 params.assoc_value = asoc ? asoc->pf_expose
7842 : sctp_sk(sk)->pf_expose;
7844 if (put_user(len, optlen))
7847 if (copy_to_user(optval, ¶ms, len))
7856 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7857 char __user *optval, int __user *optlen)
7862 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7864 /* I can hardly begin to describe how wrong this is. This is
7865 * so broken as to be worse than useless. The API draft
7866 * REALLY is NOT helpful here... I am not convinced that the
7867 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7868 * are at all well-founded.
7870 if (level != SOL_SCTP) {
7871 struct sctp_af *af = sctp_sk(sk)->pf->af;
7873 retval = af->getsockopt(sk, level, optname, optval, optlen);
7877 if (get_user(len, optlen))
7887 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7889 case SCTP_DISABLE_FRAGMENTS:
7890 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7894 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7896 case SCTP_AUTOCLOSE:
7897 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7899 case SCTP_SOCKOPT_PEELOFF:
7900 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7902 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7903 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7905 case SCTP_PEER_ADDR_PARAMS:
7906 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7909 case SCTP_DELAYED_SACK:
7910 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7914 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7916 case SCTP_GET_PEER_ADDRS:
7917 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7920 case SCTP_GET_LOCAL_ADDRS:
7921 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7924 case SCTP_SOCKOPT_CONNECTX3:
7925 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7927 case SCTP_DEFAULT_SEND_PARAM:
7928 retval = sctp_getsockopt_default_send_param(sk, len,
7931 case SCTP_DEFAULT_SNDINFO:
7932 retval = sctp_getsockopt_default_sndinfo(sk, len,
7935 case SCTP_PRIMARY_ADDR:
7936 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7939 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7942 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7944 case SCTP_ASSOCINFO:
7945 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7947 case SCTP_I_WANT_MAPPED_V4_ADDR:
7948 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7951 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7953 case SCTP_GET_PEER_ADDR_INFO:
7954 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7957 case SCTP_ADAPTATION_LAYER:
7958 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7962 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7964 case SCTP_FRAGMENT_INTERLEAVE:
7965 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7968 case SCTP_PARTIAL_DELIVERY_POINT:
7969 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7972 case SCTP_MAX_BURST:
7973 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7976 case SCTP_AUTH_CHUNK:
7977 case SCTP_AUTH_DELETE_KEY:
7978 case SCTP_AUTH_DEACTIVATE_KEY:
7979 retval = -EOPNOTSUPP;
7981 case SCTP_HMAC_IDENT:
7982 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7984 case SCTP_AUTH_ACTIVE_KEY:
7985 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7987 case SCTP_PEER_AUTH_CHUNKS:
7988 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7991 case SCTP_LOCAL_AUTH_CHUNKS:
7992 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7995 case SCTP_GET_ASSOC_NUMBER:
7996 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7998 case SCTP_GET_ASSOC_ID_LIST:
7999 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8001 case SCTP_AUTO_ASCONF:
8002 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8004 case SCTP_PEER_ADDR_THLDS:
8005 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8008 case SCTP_PEER_ADDR_THLDS_V2:
8009 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8012 case SCTP_GET_ASSOC_STATS:
8013 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8015 case SCTP_RECVRCVINFO:
8016 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8018 case SCTP_RECVNXTINFO:
8019 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8021 case SCTP_PR_SUPPORTED:
8022 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8024 case SCTP_DEFAULT_PRINFO:
8025 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8028 case SCTP_PR_ASSOC_STATUS:
8029 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8032 case SCTP_PR_STREAM_STATUS:
8033 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8036 case SCTP_RECONFIG_SUPPORTED:
8037 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8040 case SCTP_ENABLE_STREAM_RESET:
8041 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8044 case SCTP_STREAM_SCHEDULER:
8045 retval = sctp_getsockopt_scheduler(sk, len, optval,
8048 case SCTP_STREAM_SCHEDULER_VALUE:
8049 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8052 case SCTP_INTERLEAVING_SUPPORTED:
8053 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8056 case SCTP_REUSE_PORT:
8057 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8060 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8062 case SCTP_ASCONF_SUPPORTED:
8063 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8066 case SCTP_AUTH_SUPPORTED:
8067 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8070 case SCTP_ECN_SUPPORTED:
8071 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8073 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8074 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8077 retval = -ENOPROTOOPT;
8085 static int sctp_hash(struct sock *sk)
8091 static void sctp_unhash(struct sock *sk)
8096 /* Check if port is acceptable. Possibly find first available port.
8098 * The port hash table (contained in the 'global' SCTP protocol storage
8099 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8100 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8101 * list (the list number is the port number hashed out, so as you
8102 * would expect from a hash function, all the ports in a given list have
8103 * such a number that hashes out to the same list number; you were
8104 * expecting that, right?); so each list has a set of ports, with a
8105 * link to the socket (struct sock) that uses it, the port number and
8106 * a fastreuse flag (FIXME: NPI ipg).
8108 static struct sctp_bind_bucket *sctp_bucket_create(
8109 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8111 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8113 struct sctp_sock *sp = sctp_sk(sk);
8114 bool reuse = (sk->sk_reuse || sp->reuse);
8115 struct sctp_bind_hashbucket *head; /* hash list */
8116 struct net *net = sock_net(sk);
8117 kuid_t uid = sock_i_uid(sk);
8118 struct sctp_bind_bucket *pp;
8119 unsigned short snum;
8122 snum = ntohs(addr->v4.sin_port);
8124 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8129 /* Search for an available port. */
8130 int low, high, remaining, index;
8133 inet_get_local_port_range(net, &low, &high);
8134 remaining = (high - low) + 1;
8135 rover = prandom_u32() % remaining + low;
8139 if ((rover < low) || (rover > high))
8141 if (inet_is_local_reserved_port(net, rover))
8143 index = sctp_phashfn(net, rover);
8144 head = &sctp_port_hashtable[index];
8145 spin_lock(&head->lock);
8146 sctp_for_each_hentry(pp, &head->chain)
8147 if ((pp->port == rover) &&
8148 net_eq(net, pp->net))
8152 spin_unlock(&head->lock);
8153 } while (--remaining > 0);
8155 /* Exhausted local port range during search? */
8160 /* OK, here is the one we will use. HEAD (the port
8161 * hash table list entry) is non-NULL and we hold it's
8166 /* We are given an specific port number; we verify
8167 * that it is not being used. If it is used, we will
8168 * exahust the search in the hash list corresponding
8169 * to the port number (snum) - we detect that with the
8170 * port iterator, pp being NULL.
8172 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8173 spin_lock(&head->lock);
8174 sctp_for_each_hentry(pp, &head->chain) {
8175 if ((pp->port == snum) && net_eq(pp->net, net))
8182 if (!hlist_empty(&pp->owner)) {
8183 /* We had a port hash table hit - there is an
8184 * available port (pp != NULL) and it is being
8185 * used by other socket (pp->owner not empty); that other
8186 * socket is going to be sk2.
8190 pr_debug("%s: found a possible match\n", __func__);
8192 if ((pp->fastreuse && reuse &&
8193 sk->sk_state != SCTP_SS_LISTENING) ||
8194 (pp->fastreuseport && sk->sk_reuseport &&
8195 uid_eq(pp->fastuid, uid)))
8198 /* Run through the list of sockets bound to the port
8199 * (pp->port) [via the pointers bind_next and
8200 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8201 * we get the endpoint they describe and run through
8202 * the endpoint's list of IP (v4 or v6) addresses,
8203 * comparing each of the addresses with the address of
8204 * the socket sk. If we find a match, then that means
8205 * that this port/socket (sk) combination are already
8208 sk_for_each_bound(sk2, &pp->owner) {
8209 struct sctp_sock *sp2 = sctp_sk(sk2);
8210 struct sctp_endpoint *ep2 = sp2->ep;
8213 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8214 sk2->sk_state != SCTP_SS_LISTENING) ||
8215 (sk->sk_reuseport && sk2->sk_reuseport &&
8216 uid_eq(uid, sock_i_uid(sk2))))
8219 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8226 pr_debug("%s: found a match\n", __func__);
8229 /* If there was a hash table miss, create a new port. */
8231 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8234 /* In either case (hit or miss), make sure fastreuse is 1 only
8235 * if sk->sk_reuse is too (that is, if the caller requested
8236 * SO_REUSEADDR on this socket -sk-).
8238 if (hlist_empty(&pp->owner)) {
8239 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8244 if (sk->sk_reuseport) {
8245 pp->fastreuseport = 1;
8248 pp->fastreuseport = 0;
8251 if (pp->fastreuse &&
8252 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8255 if (pp->fastreuseport &&
8256 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8257 pp->fastreuseport = 0;
8260 /* We are set, so fill up all the data in the hash table
8261 * entry, tie the socket list information with the rest of the
8262 * sockets FIXME: Blurry, NPI (ipg).
8265 if (!sp->bind_hash) {
8266 inet_sk(sk)->inet_num = snum;
8267 sk_add_bind_node(sk, &pp->owner);
8273 spin_unlock(&head->lock);
8280 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8281 * port is requested.
8283 static int sctp_get_port(struct sock *sk, unsigned short snum)
8285 union sctp_addr addr;
8286 struct sctp_af *af = sctp_sk(sk)->pf->af;
8288 /* Set up a dummy address struct from the sk. */
8289 af->from_sk(&addr, sk);
8290 addr.v4.sin_port = htons(snum);
8292 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8293 return sctp_get_port_local(sk, &addr);
8297 * Move a socket to LISTENING state.
8299 static int sctp_listen_start(struct sock *sk, int backlog)
8301 struct sctp_sock *sp = sctp_sk(sk);
8302 struct sctp_endpoint *ep = sp->ep;
8303 struct crypto_shash *tfm = NULL;
8306 /* Allocate HMAC for generating cookie. */
8307 if (!sp->hmac && sp->sctp_hmac_alg) {
8308 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8309 tfm = crypto_alloc_shash(alg, 0, 0);
8311 net_info_ratelimited("failed to load transform for %s: %ld\n",
8312 sp->sctp_hmac_alg, PTR_ERR(tfm));
8315 sctp_sk(sk)->hmac = tfm;
8319 * If a bind() or sctp_bindx() is not called prior to a listen()
8320 * call that allows new associations to be accepted, the system
8321 * picks an ephemeral port and will choose an address set equivalent
8322 * to binding with a wildcard address.
8324 * This is not currently spelled out in the SCTP sockets
8325 * extensions draft, but follows the practice as seen in TCP
8329 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8330 if (!ep->base.bind_addr.port) {
8331 if (sctp_autobind(sk))
8334 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8335 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8340 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8341 return sctp_hash_endpoint(ep);
8345 * 4.1.3 / 5.1.3 listen()
8347 * By default, new associations are not accepted for UDP style sockets.
8348 * An application uses listen() to mark a socket as being able to
8349 * accept new associations.
8351 * On TCP style sockets, applications use listen() to ready the SCTP
8352 * endpoint for accepting inbound associations.
8354 * On both types of endpoints a backlog of '0' disables listening.
8356 * Move a socket to LISTENING state.
8358 int sctp_inet_listen(struct socket *sock, int backlog)
8360 struct sock *sk = sock->sk;
8361 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8364 if (unlikely(backlog < 0))
8369 /* Peeled-off sockets are not allowed to listen(). */
8370 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8373 if (sock->state != SS_UNCONNECTED)
8376 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8379 /* If backlog is zero, disable listening. */
8381 if (sctp_sstate(sk, CLOSED))
8385 sctp_unhash_endpoint(ep);
8386 sk->sk_state = SCTP_SS_CLOSED;
8387 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8388 sctp_sk(sk)->bind_hash->fastreuse = 1;
8392 /* If we are already listening, just update the backlog */
8393 if (sctp_sstate(sk, LISTENING))
8394 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8396 err = sctp_listen_start(sk, backlog);
8408 * This function is done by modeling the current datagram_poll() and the
8409 * tcp_poll(). Note that, based on these implementations, we don't
8410 * lock the socket in this function, even though it seems that,
8411 * ideally, locking or some other mechanisms can be used to ensure
8412 * the integrity of the counters (sndbuf and wmem_alloc) used
8413 * in this place. We assume that we don't need locks either until proven
8416 * Another thing to note is that we include the Async I/O support
8417 * here, again, by modeling the current TCP/UDP code. We don't have
8418 * a good way to test with it yet.
8420 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8422 struct sock *sk = sock->sk;
8423 struct sctp_sock *sp = sctp_sk(sk);
8426 poll_wait(file, sk_sleep(sk), wait);
8428 sock_rps_record_flow(sk);
8430 /* A TCP-style listening socket becomes readable when the accept queue
8433 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8434 return (!list_empty(&sp->ep->asocs)) ?
8435 (EPOLLIN | EPOLLRDNORM) : 0;
8439 /* Is there any exceptional events? */
8440 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8442 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8443 if (sk->sk_shutdown & RCV_SHUTDOWN)
8444 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8445 if (sk->sk_shutdown == SHUTDOWN_MASK)
8448 /* Is it readable? Reconsider this code with TCP-style support. */
8449 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8450 mask |= EPOLLIN | EPOLLRDNORM;
8452 /* The association is either gone or not ready. */
8453 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8456 /* Is it writable? */
8457 if (sctp_writeable(sk)) {
8458 mask |= EPOLLOUT | EPOLLWRNORM;
8460 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8462 * Since the socket is not locked, the buffer
8463 * might be made available after the writeable check and
8464 * before the bit is set. This could cause a lost I/O
8465 * signal. tcp_poll() has a race breaker for this race
8466 * condition. Based on their implementation, we put
8467 * in the following code to cover it as well.
8469 if (sctp_writeable(sk))
8470 mask |= EPOLLOUT | EPOLLWRNORM;
8475 /********************************************************************
8476 * 2nd Level Abstractions
8477 ********************************************************************/
8479 static struct sctp_bind_bucket *sctp_bucket_create(
8480 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8482 struct sctp_bind_bucket *pp;
8484 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8486 SCTP_DBG_OBJCNT_INC(bind_bucket);
8489 INIT_HLIST_HEAD(&pp->owner);
8491 hlist_add_head(&pp->node, &head->chain);
8496 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8497 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8499 if (pp && hlist_empty(&pp->owner)) {
8500 __hlist_del(&pp->node);
8501 kmem_cache_free(sctp_bucket_cachep, pp);
8502 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8506 /* Release this socket's reference to a local port. */
8507 static inline void __sctp_put_port(struct sock *sk)
8509 struct sctp_bind_hashbucket *head =
8510 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8511 inet_sk(sk)->inet_num)];
8512 struct sctp_bind_bucket *pp;
8514 spin_lock(&head->lock);
8515 pp = sctp_sk(sk)->bind_hash;
8516 __sk_del_bind_node(sk);
8517 sctp_sk(sk)->bind_hash = NULL;
8518 inet_sk(sk)->inet_num = 0;
8519 sctp_bucket_destroy(pp);
8520 spin_unlock(&head->lock);
8523 void sctp_put_port(struct sock *sk)
8526 __sctp_put_port(sk);
8531 * The system picks an ephemeral port and choose an address set equivalent
8532 * to binding with a wildcard address.
8533 * One of those addresses will be the primary address for the association.
8534 * This automatically enables the multihoming capability of SCTP.
8536 static int sctp_autobind(struct sock *sk)
8538 union sctp_addr autoaddr;
8542 /* Initialize a local sockaddr structure to INADDR_ANY. */
8543 af = sctp_sk(sk)->pf->af;
8545 port = htons(inet_sk(sk)->inet_num);
8546 af->inaddr_any(&autoaddr, port);
8548 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8551 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8554 * 4.2 The cmsghdr Structure *
8556 * When ancillary data is sent or received, any number of ancillary data
8557 * objects can be specified by the msg_control and msg_controllen members of
8558 * the msghdr structure, because each object is preceded by
8559 * a cmsghdr structure defining the object's length (the cmsg_len member).
8560 * Historically Berkeley-derived implementations have passed only one object
8561 * at a time, but this API allows multiple objects to be
8562 * passed in a single call to sendmsg() or recvmsg(). The following example
8563 * shows two ancillary data objects in a control buffer.
8565 * |<--------------------------- msg_controllen -------------------------->|
8568 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8570 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8573 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8575 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8578 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8579 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8581 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8583 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8590 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8592 struct msghdr *my_msg = (struct msghdr *)msg;
8593 struct cmsghdr *cmsg;
8595 for_each_cmsghdr(cmsg, my_msg) {
8596 if (!CMSG_OK(my_msg, cmsg))
8599 /* Should we parse this header or ignore? */
8600 if (cmsg->cmsg_level != IPPROTO_SCTP)
8603 /* Strictly check lengths following example in SCM code. */
8604 switch (cmsg->cmsg_type) {
8606 /* SCTP Socket API Extension
8607 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8609 * This cmsghdr structure provides information for
8610 * initializing new SCTP associations with sendmsg().
8611 * The SCTP_INITMSG socket option uses this same data
8612 * structure. This structure is not used for
8615 * cmsg_level cmsg_type cmsg_data[]
8616 * ------------ ------------ ----------------------
8617 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8619 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8622 cmsgs->init = CMSG_DATA(cmsg);
8626 /* SCTP Socket API Extension
8627 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8629 * This cmsghdr structure specifies SCTP options for
8630 * sendmsg() and describes SCTP header information
8631 * about a received message through recvmsg().
8633 * cmsg_level cmsg_type cmsg_data[]
8634 * ------------ ------------ ----------------------
8635 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8637 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8640 cmsgs->srinfo = CMSG_DATA(cmsg);
8642 if (cmsgs->srinfo->sinfo_flags &
8643 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8644 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8645 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8650 /* SCTP Socket API Extension
8651 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8653 * This cmsghdr structure specifies SCTP options for
8654 * sendmsg(). This structure and SCTP_RCVINFO replaces
8655 * SCTP_SNDRCV which has been deprecated.
8657 * cmsg_level cmsg_type cmsg_data[]
8658 * ------------ ------------ ---------------------
8659 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8661 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8664 cmsgs->sinfo = CMSG_DATA(cmsg);
8666 if (cmsgs->sinfo->snd_flags &
8667 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8668 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8669 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8673 /* SCTP Socket API Extension
8674 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8676 * This cmsghdr structure specifies SCTP options for sendmsg().
8678 * cmsg_level cmsg_type cmsg_data[]
8679 * ------------ ------------ ---------------------
8680 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8682 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8685 cmsgs->prinfo = CMSG_DATA(cmsg);
8686 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8689 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8690 cmsgs->prinfo->pr_value = 0;
8693 /* SCTP Socket API Extension
8694 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8696 * This cmsghdr structure specifies SCTP options for sendmsg().
8698 * cmsg_level cmsg_type cmsg_data[]
8699 * ------------ ------------ ---------------------
8700 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8702 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8705 cmsgs->authinfo = CMSG_DATA(cmsg);
8707 case SCTP_DSTADDRV4:
8708 case SCTP_DSTADDRV6:
8709 /* SCTP Socket API Extension
8710 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8712 * This cmsghdr structure specifies SCTP options for sendmsg().
8714 * cmsg_level cmsg_type cmsg_data[]
8715 * ------------ ------------ ---------------------
8716 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8717 * ------------ ------------ ---------------------
8718 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8720 cmsgs->addrs_msg = my_msg;
8731 * Wait for a packet..
8732 * Note: This function is the same function as in core/datagram.c
8733 * with a few modifications to make lksctp work.
8735 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8740 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8742 /* Socket errors? */
8743 error = sock_error(sk);
8747 if (!skb_queue_empty(&sk->sk_receive_queue))
8750 /* Socket shut down? */
8751 if (sk->sk_shutdown & RCV_SHUTDOWN)
8754 /* Sequenced packets can come disconnected. If so we report the
8759 /* Is there a good reason to think that we may receive some data? */
8760 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8763 /* Handle signals. */
8764 if (signal_pending(current))
8767 /* Let another process have a go. Since we are going to sleep
8768 * anyway. Note: This may cause odd behaviors if the message
8769 * does not fit in the user's buffer, but this seems to be the
8770 * only way to honor MSG_DONTWAIT realistically.
8773 *timeo_p = schedule_timeout(*timeo_p);
8777 finish_wait(sk_sleep(sk), &wait);
8781 error = sock_intr_errno(*timeo_p);
8784 finish_wait(sk_sleep(sk), &wait);
8789 /* Receive a datagram.
8790 * Note: This is pretty much the same routine as in core/datagram.c
8791 * with a few changes to make lksctp work.
8793 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8794 int noblock, int *err)
8797 struct sk_buff *skb;
8800 timeo = sock_rcvtimeo(sk, noblock);
8802 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8803 MAX_SCHEDULE_TIMEOUT);
8806 /* Again only user level code calls this function,
8807 * so nothing interrupt level
8808 * will suddenly eat the receive_queue.
8810 * Look at current nfs client by the way...
8811 * However, this function was correct in any case. 8)
8813 if (flags & MSG_PEEK) {
8814 skb = skb_peek(&sk->sk_receive_queue);
8816 refcount_inc(&skb->users);
8818 skb = __skb_dequeue(&sk->sk_receive_queue);
8824 /* Caller is allowed not to check sk->sk_err before calling. */
8825 error = sock_error(sk);
8829 if (sk->sk_shutdown & RCV_SHUTDOWN)
8832 if (sk_can_busy_loop(sk)) {
8833 sk_busy_loop(sk, noblock);
8835 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8839 /* User doesn't want to wait. */
8843 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8852 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8853 static void __sctp_write_space(struct sctp_association *asoc)
8855 struct sock *sk = asoc->base.sk;
8857 if (sctp_wspace(asoc) <= 0)
8860 if (waitqueue_active(&asoc->wait))
8861 wake_up_interruptible(&asoc->wait);
8863 if (sctp_writeable(sk)) {
8864 struct socket_wq *wq;
8867 wq = rcu_dereference(sk->sk_wq);
8869 if (waitqueue_active(&wq->wait))
8870 wake_up_interruptible(&wq->wait);
8872 /* Note that we try to include the Async I/O support
8873 * here by modeling from the current TCP/UDP code.
8874 * We have not tested with it yet.
8876 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8877 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8883 static void sctp_wake_up_waiters(struct sock *sk,
8884 struct sctp_association *asoc)
8886 struct sctp_association *tmp = asoc;
8888 /* We do accounting for the sndbuf space per association,
8889 * so we only need to wake our own association.
8891 if (asoc->ep->sndbuf_policy)
8892 return __sctp_write_space(asoc);
8894 /* If association goes down and is just flushing its
8895 * outq, then just normally notify others.
8897 if (asoc->base.dead)
8898 return sctp_write_space(sk);
8900 /* Accounting for the sndbuf space is per socket, so we
8901 * need to wake up others, try to be fair and in case of
8902 * other associations, let them have a go first instead
8903 * of just doing a sctp_write_space() call.
8905 * Note that we reach sctp_wake_up_waiters() only when
8906 * associations free up queued chunks, thus we are under
8907 * lock and the list of associations on a socket is
8908 * guaranteed not to change.
8910 for (tmp = list_next_entry(tmp, asocs); 1;
8911 tmp = list_next_entry(tmp, asocs)) {
8912 /* Manually skip the head element. */
8913 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8915 /* Wake up association. */
8916 __sctp_write_space(tmp);
8917 /* We've reached the end. */
8923 /* Do accounting for the sndbuf space.
8924 * Decrement the used sndbuf space of the corresponding association by the
8925 * data size which was just transmitted(freed).
8927 static void sctp_wfree(struct sk_buff *skb)
8929 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8930 struct sctp_association *asoc = chunk->asoc;
8931 struct sock *sk = asoc->base.sk;
8933 sk_mem_uncharge(sk, skb->truesize);
8934 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8935 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8936 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8937 &sk->sk_wmem_alloc));
8940 struct sctp_shared_key *shkey = chunk->shkey;
8942 /* refcnt == 2 and !list_empty mean after this release, it's
8943 * not being used anywhere, and it's time to notify userland
8944 * that this shkey can be freed if it's been deactivated.
8946 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8947 refcount_read(&shkey->refcnt) == 2) {
8948 struct sctp_ulpevent *ev;
8950 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8954 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8956 sctp_auth_shkey_release(chunk->shkey);
8960 sctp_wake_up_waiters(sk, asoc);
8962 sctp_association_put(asoc);
8965 /* Do accounting for the receive space on the socket.
8966 * Accounting for the association is done in ulpevent.c
8967 * We set this as a destructor for the cloned data skbs so that
8968 * accounting is done at the correct time.
8970 void sctp_sock_rfree(struct sk_buff *skb)
8972 struct sock *sk = skb->sk;
8973 struct sctp_ulpevent *event = sctp_skb2event(skb);
8975 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8978 * Mimic the behavior of sock_rfree
8980 sk_mem_uncharge(sk, event->rmem_len);
8984 /* Helper function to wait for space in the sndbuf. */
8985 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8988 struct sock *sk = asoc->base.sk;
8989 long current_timeo = *timeo_p;
8993 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8996 /* Increment the association's refcnt. */
8997 sctp_association_hold(asoc);
8999 /* Wait on the association specific sndbuf space. */
9001 prepare_to_wait_exclusive(&asoc->wait, &wait,
9002 TASK_INTERRUPTIBLE);
9003 if (asoc->base.dead)
9007 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9009 if (signal_pending(current))
9010 goto do_interrupted;
9011 if (sk_under_memory_pressure(sk))
9013 if ((int)msg_len <= sctp_wspace(asoc) &&
9014 sk_wmem_schedule(sk, msg_len))
9017 /* Let another process have a go. Since we are going
9021 current_timeo = schedule_timeout(current_timeo);
9023 if (sk != asoc->base.sk)
9026 *timeo_p = current_timeo;
9030 finish_wait(&asoc->wait, &wait);
9032 /* Release the association's refcnt. */
9033 sctp_association_put(asoc);
9046 err = sock_intr_errno(*timeo_p);
9054 void sctp_data_ready(struct sock *sk)
9056 struct socket_wq *wq;
9059 wq = rcu_dereference(sk->sk_wq);
9060 if (skwq_has_sleeper(wq))
9061 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9062 EPOLLRDNORM | EPOLLRDBAND);
9063 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
9067 /* If socket sndbuf has changed, wake up all per association waiters. */
9068 void sctp_write_space(struct sock *sk)
9070 struct sctp_association *asoc;
9072 /* Wake up the tasks in each wait queue. */
9073 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9074 __sctp_write_space(asoc);
9078 /* Is there any sndbuf space available on the socket?
9080 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9081 * associations on the same socket. For a UDP-style socket with
9082 * multiple associations, it is possible for it to be "unwriteable"
9083 * prematurely. I assume that this is acceptable because
9084 * a premature "unwriteable" is better than an accidental "writeable" which
9085 * would cause an unwanted block under certain circumstances. For the 1-1
9086 * UDP-style sockets or TCP-style sockets, this code should work.
9089 static bool sctp_writeable(struct sock *sk)
9091 return sk->sk_sndbuf > sk->sk_wmem_queued;
9094 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9095 * returns immediately with EINPROGRESS.
9097 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9099 struct sock *sk = asoc->base.sk;
9101 long current_timeo = *timeo_p;
9104 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9106 /* Increment the association's refcnt. */
9107 sctp_association_hold(asoc);
9110 prepare_to_wait_exclusive(&asoc->wait, &wait,
9111 TASK_INTERRUPTIBLE);
9114 if (sk->sk_shutdown & RCV_SHUTDOWN)
9116 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9119 if (signal_pending(current))
9120 goto do_interrupted;
9122 if (sctp_state(asoc, ESTABLISHED))
9125 /* Let another process have a go. Since we are going
9129 current_timeo = schedule_timeout(current_timeo);
9132 *timeo_p = current_timeo;
9136 finish_wait(&asoc->wait, &wait);
9138 /* Release the association's refcnt. */
9139 sctp_association_put(asoc);
9144 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9147 err = -ECONNREFUSED;
9151 err = sock_intr_errno(*timeo_p);
9159 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9161 struct sctp_endpoint *ep;
9165 ep = sctp_sk(sk)->ep;
9169 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9170 TASK_INTERRUPTIBLE);
9172 if (list_empty(&ep->asocs)) {
9174 timeo = schedule_timeout(timeo);
9179 if (!sctp_sstate(sk, LISTENING))
9183 if (!list_empty(&ep->asocs))
9186 err = sock_intr_errno(timeo);
9187 if (signal_pending(current))
9195 finish_wait(sk_sleep(sk), &wait);
9200 static void sctp_wait_for_close(struct sock *sk, long timeout)
9205 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9206 if (list_empty(&sctp_sk(sk)->ep->asocs))
9209 timeout = schedule_timeout(timeout);
9211 } while (!signal_pending(current) && timeout);
9213 finish_wait(sk_sleep(sk), &wait);
9216 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9218 struct sk_buff *frag;
9223 /* Don't forget the fragments. */
9224 skb_walk_frags(skb, frag)
9225 sctp_skb_set_owner_r_frag(frag, sk);
9228 sctp_skb_set_owner_r(skb, sk);
9231 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9232 struct sctp_association *asoc)
9234 struct inet_sock *inet = inet_sk(sk);
9235 struct inet_sock *newinet;
9236 struct sctp_sock *sp = sctp_sk(sk);
9237 struct sctp_endpoint *ep = sp->ep;
9239 newsk->sk_type = sk->sk_type;
9240 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9241 newsk->sk_flags = sk->sk_flags;
9242 newsk->sk_tsflags = sk->sk_tsflags;
9243 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9244 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9245 newsk->sk_reuse = sk->sk_reuse;
9246 sctp_sk(newsk)->reuse = sp->reuse;
9248 newsk->sk_shutdown = sk->sk_shutdown;
9249 newsk->sk_destruct = sctp_destruct_sock;
9250 newsk->sk_family = sk->sk_family;
9251 newsk->sk_protocol = IPPROTO_SCTP;
9252 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9253 newsk->sk_sndbuf = sk->sk_sndbuf;
9254 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9255 newsk->sk_lingertime = sk->sk_lingertime;
9256 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9257 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9258 newsk->sk_rxhash = sk->sk_rxhash;
9260 newinet = inet_sk(newsk);
9262 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9263 * getsockname() and getpeername()
9265 newinet->inet_sport = inet->inet_sport;
9266 newinet->inet_saddr = inet->inet_saddr;
9267 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9268 newinet->inet_dport = htons(asoc->peer.port);
9269 newinet->pmtudisc = inet->pmtudisc;
9270 newinet->inet_id = prandom_u32();
9272 newinet->uc_ttl = inet->uc_ttl;
9273 newinet->mc_loop = 1;
9274 newinet->mc_ttl = 1;
9275 newinet->mc_index = 0;
9276 newinet->mc_list = NULL;
9278 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9279 net_enable_timestamp();
9281 /* Set newsk security attributes from orginal sk and connection
9282 * security attribute from ep.
9284 security_sctp_sk_clone(ep, sk, newsk);
9287 static inline void sctp_copy_descendant(struct sock *sk_to,
9288 const struct sock *sk_from)
9290 int ancestor_size = sizeof(struct inet_sock) +
9291 sizeof(struct sctp_sock) -
9292 offsetof(struct sctp_sock, pd_lobby);
9294 if (sk_from->sk_family == PF_INET6)
9295 ancestor_size += sizeof(struct ipv6_pinfo);
9297 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9300 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9301 * and its messages to the newsk.
9303 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9304 struct sctp_association *assoc,
9305 enum sctp_socket_type type)
9307 struct sctp_sock *oldsp = sctp_sk(oldsk);
9308 struct sctp_sock *newsp = sctp_sk(newsk);
9309 struct sctp_bind_bucket *pp; /* hash list port iterator */
9310 struct sctp_endpoint *newep = newsp->ep;
9311 struct sk_buff *skb, *tmp;
9312 struct sctp_ulpevent *event;
9313 struct sctp_bind_hashbucket *head;
9316 /* Migrate socket buffer sizes and all the socket level options to the
9319 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9320 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9321 /* Brute force copy old sctp opt. */
9322 sctp_copy_descendant(newsk, oldsk);
9324 /* Restore the ep value that was overwritten with the above structure
9330 /* Hook this new socket in to the bind_hash list. */
9331 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9332 inet_sk(oldsk)->inet_num)];
9333 spin_lock_bh(&head->lock);
9334 pp = sctp_sk(oldsk)->bind_hash;
9335 sk_add_bind_node(newsk, &pp->owner);
9336 sctp_sk(newsk)->bind_hash = pp;
9337 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9338 spin_unlock_bh(&head->lock);
9340 /* Copy the bind_addr list from the original endpoint to the new
9341 * endpoint so that we can handle restarts properly
9343 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9344 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9348 /* New ep's auth_hmacs should be set if old ep's is set, in case
9349 * that net->sctp.auth_enable has been changed to 0 by users and
9350 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9352 if (oldsp->ep->auth_hmacs) {
9353 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9358 /* Move any messages in the old socket's receive queue that are for the
9359 * peeled off association to the new socket's receive queue.
9361 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9362 event = sctp_skb2event(skb);
9363 if (event->asoc == assoc) {
9364 __skb_unlink(skb, &oldsk->sk_receive_queue);
9365 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9366 sctp_skb_set_owner_r_frag(skb, newsk);
9370 /* Clean up any messages pending delivery due to partial
9371 * delivery. Three cases:
9372 * 1) No partial deliver; no work.
9373 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9374 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9376 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9378 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9379 struct sk_buff_head *queue;
9381 /* Decide which queue to move pd_lobby skbs to. */
9382 if (assoc->ulpq.pd_mode) {
9383 queue = &newsp->pd_lobby;
9385 queue = &newsk->sk_receive_queue;
9387 /* Walk through the pd_lobby, looking for skbs that
9388 * need moved to the new socket.
9390 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9391 event = sctp_skb2event(skb);
9392 if (event->asoc == assoc) {
9393 __skb_unlink(skb, &oldsp->pd_lobby);
9394 __skb_queue_tail(queue, skb);
9395 sctp_skb_set_owner_r_frag(skb, newsk);
9399 /* Clear up any skbs waiting for the partial
9400 * delivery to finish.
9402 if (assoc->ulpq.pd_mode)
9403 sctp_clear_pd(oldsk, NULL);
9407 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9409 /* Set the type of socket to indicate that it is peeled off from the
9410 * original UDP-style socket or created with the accept() call on a
9411 * TCP-style socket..
9415 /* Mark the new socket "in-use" by the user so that any packets
9416 * that may arrive on the association after we've moved it are
9417 * queued to the backlog. This prevents a potential race between
9418 * backlog processing on the old socket and new-packet processing
9419 * on the new socket.
9421 * The caller has just allocated newsk so we can guarantee that other
9422 * paths won't try to lock it and then oldsk.
9424 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9425 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9426 sctp_assoc_migrate(assoc, newsk);
9427 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9429 /* If the association on the newsk is already closed before accept()
9430 * is called, set RCV_SHUTDOWN flag.
9432 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9433 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9434 newsk->sk_shutdown |= RCV_SHUTDOWN;
9436 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9439 release_sock(newsk);
9445 /* This proto struct describes the ULP interface for SCTP. */
9446 struct proto sctp_prot = {
9448 .owner = THIS_MODULE,
9449 .close = sctp_close,
9450 .disconnect = sctp_disconnect,
9451 .accept = sctp_accept,
9452 .ioctl = sctp_ioctl,
9453 .init = sctp_init_sock,
9454 .destroy = sctp_destroy_sock,
9455 .shutdown = sctp_shutdown,
9456 .setsockopt = sctp_setsockopt,
9457 .getsockopt = sctp_getsockopt,
9458 .sendmsg = sctp_sendmsg,
9459 .recvmsg = sctp_recvmsg,
9461 .bind_add = sctp_bind_add,
9462 .backlog_rcv = sctp_backlog_rcv,
9464 .unhash = sctp_unhash,
9465 .no_autobind = true,
9466 .obj_size = sizeof(struct sctp_sock),
9467 .useroffset = offsetof(struct sctp_sock, subscribe),
9468 .usersize = offsetof(struct sctp_sock, initmsg) -
9469 offsetof(struct sctp_sock, subscribe) +
9470 sizeof_field(struct sctp_sock, initmsg),
9471 .sysctl_mem = sysctl_sctp_mem,
9472 .sysctl_rmem = sysctl_sctp_rmem,
9473 .sysctl_wmem = sysctl_sctp_wmem,
9474 .memory_pressure = &sctp_memory_pressure,
9475 .enter_memory_pressure = sctp_enter_memory_pressure,
9476 .memory_allocated = &sctp_memory_allocated,
9477 .sockets_allocated = &sctp_sockets_allocated,
9480 #if IS_ENABLED(CONFIG_IPV6)
9482 #include <net/transp_v6.h>
9483 static void sctp_v6_destroy_sock(struct sock *sk)
9485 sctp_destroy_sock(sk);
9486 inet6_destroy_sock(sk);
9489 struct proto sctpv6_prot = {
9491 .owner = THIS_MODULE,
9492 .close = sctp_close,
9493 .disconnect = sctp_disconnect,
9494 .accept = sctp_accept,
9495 .ioctl = sctp_ioctl,
9496 .init = sctp_init_sock,
9497 .destroy = sctp_v6_destroy_sock,
9498 .shutdown = sctp_shutdown,
9499 .setsockopt = sctp_setsockopt,
9500 .getsockopt = sctp_getsockopt,
9501 .sendmsg = sctp_sendmsg,
9502 .recvmsg = sctp_recvmsg,
9504 .bind_add = sctp_bind_add,
9505 .backlog_rcv = sctp_backlog_rcv,
9507 .unhash = sctp_unhash,
9508 .no_autobind = true,
9509 .obj_size = sizeof(struct sctp6_sock),
9510 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9511 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9512 offsetof(struct sctp6_sock, sctp.subscribe) +
9513 sizeof_field(struct sctp6_sock, sctp.initmsg),
9514 .sysctl_mem = sysctl_sctp_mem,
9515 .sysctl_rmem = sysctl_sctp_rmem,
9516 .sysctl_wmem = sysctl_sctp_wmem,
9517 .memory_pressure = &sctp_memory_pressure,
9518 .enter_memory_pressure = sctp_enter_memory_pressure,
9519 .memory_allocated = &sctp_memory_allocated,
9520 .sockets_allocated = &sctp_sockets_allocated,
9522 #endif /* IS_ENABLED(CONFIG_IPV6) */