1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, see
32 * <http://www.gnu.org/licenses/>.
34 * Please send any bug reports or fixes you make to the
38 * Written or modified by:
53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
55 #include <crypto/hash.h>
56 #include <linux/types.h>
57 #include <linux/kernel.h>
58 #include <linux/wait.h>
59 #include <linux/time.h>
60 #include <linux/sched/signal.h>
62 #include <linux/capability.h>
63 #include <linux/fcntl.h>
64 #include <linux/poll.h>
65 #include <linux/init.h>
66 #include <linux/slab.h>
67 #include <linux/file.h>
68 #include <linux/compat.h>
69 #include <linux/rhashtable.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
76 #include <net/busy_poll.h>
78 #include <linux/socket.h> /* for sa_family_t */
79 #include <linux/export.h>
81 #include <net/sctp/sctp.h>
82 #include <net/sctp/sm.h>
83 #include <net/sctp/stream_sched.h>
85 /* Forward declarations for internal helper functions. */
86 static bool sctp_writeable(struct sock *sk);
87 static void sctp_wfree(struct sk_buff *skb);
88 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
90 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
91 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
92 static int sctp_wait_for_accept(struct sock *sk, long timeo);
93 static void sctp_wait_for_close(struct sock *sk, long timeo);
94 static void sctp_destruct_sock(struct sock *sk);
95 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
96 union sctp_addr *addr, int len);
97 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
98 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
99 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf(struct sctp_association *asoc,
102 struct sctp_chunk *chunk);
103 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
104 static int sctp_autobind(struct sock *sk);
105 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
106 struct sctp_association *assoc,
107 enum sctp_socket_type type);
109 static unsigned long sctp_memory_pressure;
110 static atomic_long_t sctp_memory_allocated;
111 struct percpu_counter sctp_sockets_allocated;
113 static void sctp_enter_memory_pressure(struct sock *sk)
115 sctp_memory_pressure = 1;
119 /* Get the sndbuf space available at the time on the association. */
120 static inline int sctp_wspace(struct sctp_association *asoc)
122 struct sock *sk = asoc->base.sk;
124 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
125 : sk_stream_wspace(sk);
128 /* Increment the used sndbuf space count of the corresponding association by
129 * the size of the outgoing data chunk.
130 * Also, set the skb destructor for sndbuf accounting later.
132 * Since it is always 1-1 between chunk and skb, and also a new skb is always
133 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
134 * destructor in the data chunk skb for the purpose of the sndbuf space
137 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
139 struct sctp_association *asoc = chunk->asoc;
140 struct sock *sk = asoc->base.sk;
142 /* The sndbuf space is tracked per association. */
143 sctp_association_hold(asoc);
146 sctp_auth_shkey_hold(chunk->shkey);
148 skb_set_owner_w(chunk->skb, sk);
150 chunk->skb->destructor = sctp_wfree;
151 /* Save the chunk pointer in skb for sctp_wfree to use later. */
152 skb_shinfo(chunk->skb)->destructor_arg = chunk;
154 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
155 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
156 sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
157 sk_mem_charge(sk, chunk->skb->truesize);
160 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
162 skb_orphan(chunk->skb);
165 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
166 void (*cb)(struct sctp_chunk *))
169 struct sctp_outq *q = &asoc->outqueue;
170 struct sctp_transport *t;
171 struct sctp_chunk *chunk;
173 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
177 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
180 list_for_each_entry(chunk, &q->sacked, transmitted_list)
183 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
186 list_for_each_entry(chunk, &q->out_chunk_list, list)
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 long 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 && snum < inet_prot_sock(net) &&
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 ((ret = sctp_get_port_local(sk, addr))) {
421 /* Refresh ephemeral port. */
423 bp->port = inet_sk(sk)->inet_num;
425 /* Add the address to the bind address list.
426 * Use GFP_ATOMIC since BHs will be disabled.
428 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
429 SCTP_ADDR_SRC, GFP_ATOMIC);
431 /* Copy back into socket for getsockname() use. */
433 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
434 sp->pf->to_sk_saddr(addr, sk);
440 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
442 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
443 * at any one time. If a sender, after sending an ASCONF chunk, decides
444 * it needs to transfer another ASCONF Chunk, it MUST wait until the
445 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
446 * subsequent ASCONF. Note this restriction binds each side, so at any
447 * time two ASCONF may be in-transit on any given association (one sent
448 * from each endpoint).
450 static int sctp_send_asconf(struct sctp_association *asoc,
451 struct sctp_chunk *chunk)
453 struct net *net = sock_net(asoc->base.sk);
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(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 net *net = sock_net(sk);
543 struct sctp_sock *sp;
544 struct sctp_endpoint *ep;
545 struct sctp_association *asoc;
546 struct sctp_bind_addr *bp;
547 struct sctp_chunk *chunk;
548 struct sctp_sockaddr_entry *laddr;
549 union sctp_addr *addr;
550 union sctp_addr saveaddr;
557 if (!net->sctp.addip_enable)
563 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
564 __func__, sk, addrs, addrcnt);
566 list_for_each_entry(asoc, &ep->asocs, asocs) {
567 if (!asoc->peer.asconf_capable)
570 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
573 if (!sctp_state(asoc, ESTABLISHED))
576 /* Check if any address in the packed array of addresses is
577 * in the bind address list of the association. If so,
578 * do not send the asconf chunk to its peer, but continue with
579 * other associations.
582 for (i = 0; i < addrcnt; i++) {
584 af = sctp_get_af_specific(addr->v4.sin_family);
590 if (sctp_assoc_lookup_laddr(asoc, addr))
593 addr_buf += af->sockaddr_len;
598 /* Use the first valid address in bind addr list of
599 * association as Address Parameter of ASCONF CHUNK.
601 bp = &asoc->base.bind_addr;
602 p = bp->address_list.next;
603 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
604 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
605 addrcnt, SCTP_PARAM_ADD_IP);
611 /* Add the new addresses to the bind address list with
612 * use_as_src set to 0.
615 for (i = 0; i < addrcnt; i++) {
617 af = sctp_get_af_specific(addr->v4.sin_family);
618 memcpy(&saveaddr, addr, af->sockaddr_len);
619 retval = sctp_add_bind_addr(bp, &saveaddr,
621 SCTP_ADDR_NEW, GFP_ATOMIC);
622 addr_buf += af->sockaddr_len;
624 if (asoc->src_out_of_asoc_ok) {
625 struct sctp_transport *trans;
627 list_for_each_entry(trans,
628 &asoc->peer.transport_addr_list, transports) {
629 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
630 2*asoc->pathmtu, 4380));
631 trans->ssthresh = asoc->peer.i.a_rwnd;
632 trans->rto = asoc->rto_initial;
633 sctp_max_rto(asoc, trans);
634 trans->rtt = trans->srtt = trans->rttvar = 0;
635 /* Clear the source and route cache */
636 sctp_transport_route(trans, NULL,
637 sctp_sk(asoc->base.sk));
640 retval = sctp_send_asconf(asoc, chunk);
647 /* Remove a list of addresses from bind addresses list. Do not remove the
650 * Basically run through each address specified in the addrs/addrcnt
651 * array/length pair, determine if it is IPv6 or IPv4 and call
652 * sctp_del_bind() on it.
654 * If any of them fails, then the operation will be reversed and the
655 * ones that were removed will be added back.
657 * At least one address has to be left; if only one address is
658 * available, the operation will return -EBUSY.
660 * Only sctp_setsockopt_bindx() is supposed to call this function.
662 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
664 struct sctp_sock *sp = sctp_sk(sk);
665 struct sctp_endpoint *ep = sp->ep;
667 struct sctp_bind_addr *bp = &ep->base.bind_addr;
670 union sctp_addr *sa_addr;
673 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
674 __func__, sk, addrs, addrcnt);
677 for (cnt = 0; cnt < addrcnt; cnt++) {
678 /* If the bind address list is empty or if there is only one
679 * bind address, there is nothing more to be removed (we need
680 * at least one address here).
682 if (list_empty(&bp->address_list) ||
683 (sctp_list_single_entry(&bp->address_list))) {
689 af = sctp_get_af_specific(sa_addr->sa.sa_family);
695 if (!af->addr_valid(sa_addr, sp, NULL)) {
696 retval = -EADDRNOTAVAIL;
700 if (sa_addr->v4.sin_port &&
701 sa_addr->v4.sin_port != htons(bp->port)) {
706 if (!sa_addr->v4.sin_port)
707 sa_addr->v4.sin_port = htons(bp->port);
709 /* FIXME - There is probably a need to check if sk->sk_saddr and
710 * sk->sk_rcv_addr are currently set to one of the addresses to
711 * be removed. This is something which needs to be looked into
712 * when we are fixing the outstanding issues with multi-homing
713 * socket routing and failover schemes. Refer to comments in
714 * sctp_do_bind(). -daisy
716 retval = sctp_del_bind_addr(bp, sa_addr);
718 addr_buf += af->sockaddr_len;
721 /* Failed. Add the ones that has been removed back */
723 sctp_bindx_add(sk, addrs, cnt);
731 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
732 * the associations that are part of the endpoint indicating that a list of
733 * local addresses are removed from the endpoint.
735 * If any of the addresses is already in the bind address list of the
736 * association, we do not send the chunk for that association. But it will not
737 * affect other associations.
739 * Only sctp_setsockopt_bindx() is supposed to call this function.
741 static int sctp_send_asconf_del_ip(struct sock *sk,
742 struct sockaddr *addrs,
745 struct net *net = sock_net(sk);
746 struct sctp_sock *sp;
747 struct sctp_endpoint *ep;
748 struct sctp_association *asoc;
749 struct sctp_transport *transport;
750 struct sctp_bind_addr *bp;
751 struct sctp_chunk *chunk;
752 union sctp_addr *laddr;
755 struct sctp_sockaddr_entry *saddr;
761 if (!net->sctp.addip_enable)
767 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
768 __func__, sk, addrs, addrcnt);
770 list_for_each_entry(asoc, &ep->asocs, asocs) {
772 if (!asoc->peer.asconf_capable)
775 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
778 if (!sctp_state(asoc, ESTABLISHED))
781 /* Check if any address in the packed array of addresses is
782 * not present in the bind address list of the association.
783 * If so, do not send the asconf chunk to its peer, but
784 * continue with other associations.
787 for (i = 0; i < addrcnt; i++) {
789 af = sctp_get_af_specific(laddr->v4.sin_family);
795 if (!sctp_assoc_lookup_laddr(asoc, laddr))
798 addr_buf += af->sockaddr_len;
803 /* Find one address in the association's bind address list
804 * that is not in the packed array of addresses. This is to
805 * make sure that we do not delete all the addresses in the
808 bp = &asoc->base.bind_addr;
809 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
811 if ((laddr == NULL) && (addrcnt == 1)) {
812 if (asoc->asconf_addr_del_pending)
814 asoc->asconf_addr_del_pending =
815 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
816 if (asoc->asconf_addr_del_pending == NULL) {
820 asoc->asconf_addr_del_pending->sa.sa_family =
822 asoc->asconf_addr_del_pending->v4.sin_port =
824 if (addrs->sa_family == AF_INET) {
825 struct sockaddr_in *sin;
827 sin = (struct sockaddr_in *)addrs;
828 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
829 } else if (addrs->sa_family == AF_INET6) {
830 struct sockaddr_in6 *sin6;
832 sin6 = (struct sockaddr_in6 *)addrs;
833 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
836 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
837 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
838 asoc->asconf_addr_del_pending);
840 asoc->src_out_of_asoc_ok = 1;
848 /* We do not need RCU protection throughout this loop
849 * because this is done under a socket lock from the
852 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
860 /* Reset use_as_src flag for the addresses in the bind address
861 * list that are to be deleted.
864 for (i = 0; i < addrcnt; i++) {
866 af = sctp_get_af_specific(laddr->v4.sin_family);
867 list_for_each_entry(saddr, &bp->address_list, list) {
868 if (sctp_cmp_addr_exact(&saddr->a, laddr))
869 saddr->state = SCTP_ADDR_DEL;
871 addr_buf += af->sockaddr_len;
874 /* Update the route and saddr entries for all the transports
875 * as some of the addresses in the bind address list are
876 * about to be deleted and cannot be used as source addresses.
878 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
880 sctp_transport_route(transport, NULL,
881 sctp_sk(asoc->base.sk));
885 /* We don't need to transmit ASCONF */
887 retval = sctp_send_asconf(asoc, chunk);
893 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
894 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
896 struct sock *sk = sctp_opt2sk(sp);
897 union sctp_addr *addr;
900 /* It is safe to write port space in caller. */
902 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
903 af = sctp_get_af_specific(addr->sa.sa_family);
906 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
909 if (addrw->state == SCTP_ADDR_NEW)
910 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
912 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
915 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
918 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
921 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
922 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
925 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
926 * Section 3.1.2 for this usage.
928 * addrs is a pointer to an array of one or more socket addresses. Each
929 * address is contained in its appropriate structure (i.e. struct
930 * sockaddr_in or struct sockaddr_in6) the family of the address type
931 * must be used to distinguish the address length (note that this
932 * representation is termed a "packed array" of addresses). The caller
933 * specifies the number of addresses in the array with addrcnt.
935 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
936 * -1, and sets errno to the appropriate error code.
938 * For SCTP, the port given in each socket address must be the same, or
939 * sctp_bindx() will fail, setting errno to EINVAL.
941 * The flags parameter is formed from the bitwise OR of zero or more of
942 * the following currently defined flags:
944 * SCTP_BINDX_ADD_ADDR
946 * SCTP_BINDX_REM_ADDR
948 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
949 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
950 * addresses from the association. The two flags are mutually exclusive;
951 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
952 * not remove all addresses from an association; sctp_bindx() will
953 * reject such an attempt with EINVAL.
955 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
956 * additional addresses with an endpoint after calling bind(). Or use
957 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
958 * socket is associated with so that no new association accepted will be
959 * associated with those addresses. If the endpoint supports dynamic
960 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
961 * endpoint to send the appropriate message to the peer to change the
962 * peers address lists.
964 * Adding and removing addresses from a connected association is
965 * optional functionality. Implementations that do not support this
966 * functionality should return EOPNOTSUPP.
968 * Basically do nothing but copying the addresses from user to kernel
969 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
970 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
973 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
976 * sk The sk of the socket
977 * addrs The pointer to the addresses in user land
978 * addrssize Size of the addrs buffer
979 * op Operation to perform (add or remove, see the flags of
982 * Returns 0 if ok, <0 errno code on error.
984 static int sctp_setsockopt_bindx(struct sock *sk,
985 struct sockaddr __user *addrs,
986 int addrs_size, int op)
988 struct sockaddr *kaddrs;
992 struct sockaddr *sa_addr;
996 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
997 __func__, sk, addrs, addrs_size, op);
999 if (unlikely(addrs_size <= 0))
1002 kaddrs = memdup_user(addrs, addrs_size);
1003 if (unlikely(IS_ERR(kaddrs)))
1004 return PTR_ERR(kaddrs);
1006 /* Walk through the addrs buffer and count the number of addresses. */
1008 while (walk_size < addrs_size) {
1009 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1015 af = sctp_get_af_specific(sa_addr->sa_family);
1017 /* If the address family is not supported or if this address
1018 * causes the address buffer to overflow return EINVAL.
1020 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1025 addr_buf += af->sockaddr_len;
1026 walk_size += af->sockaddr_len;
1031 case SCTP_BINDX_ADD_ADDR:
1032 /* Allow security module to validate bindx addresses. */
1033 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1034 (struct sockaddr *)kaddrs,
1038 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1041 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1044 case SCTP_BINDX_REM_ADDR:
1045 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1048 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1062 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1064 * Common routine for handling connect() and sctp_connectx().
1065 * Connect will come in with just a single address.
1067 static int __sctp_connect(struct sock *sk,
1068 struct sockaddr *kaddrs,
1069 int addrs_size, int flags,
1070 sctp_assoc_t *assoc_id)
1072 struct net *net = sock_net(sk);
1073 struct sctp_sock *sp;
1074 struct sctp_endpoint *ep;
1075 struct sctp_association *asoc = NULL;
1076 struct sctp_association *asoc2;
1077 struct sctp_transport *transport;
1079 enum sctp_scope scope;
1084 union sctp_addr *sa_addr = NULL;
1086 unsigned short port;
1091 /* connect() cannot be done on a socket that is already in ESTABLISHED
1092 * state - UDP-style peeled off socket or a TCP-style socket that
1093 * is already connected.
1094 * It cannot be done even on a TCP-style listening socket.
1096 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1097 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1102 /* Walk through the addrs buffer and count the number of addresses. */
1104 while (walk_size < addrs_size) {
1107 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1113 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1115 /* If the address family is not supported or if this address
1116 * causes the address buffer to overflow return EINVAL.
1118 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1123 port = ntohs(sa_addr->v4.sin_port);
1125 /* Save current address so we can work with it */
1126 memcpy(&to, sa_addr, af->sockaddr_len);
1128 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1132 /* Make sure the destination port is correctly set
1135 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1140 /* Check if there already is a matching association on the
1141 * endpoint (other than the one created here).
1143 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1144 if (asoc2 && asoc2 != asoc) {
1145 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1152 /* If we could not find a matching association on the endpoint,
1153 * make sure that there is no peeled-off association matching
1154 * the peer address even on another socket.
1156 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1157 err = -EADDRNOTAVAIL;
1162 /* If a bind() or sctp_bindx() is not called prior to
1163 * an sctp_connectx() call, the system picks an
1164 * ephemeral port and will choose an address set
1165 * equivalent to binding with a wildcard address.
1167 if (!ep->base.bind_addr.port) {
1168 if (sctp_autobind(sk)) {
1174 * If an unprivileged user inherits a 1-many
1175 * style socket with open associations on a
1176 * privileged port, it MAY be permitted to
1177 * accept new associations, but it SHOULD NOT
1178 * be permitted to open new associations.
1180 if (ep->base.bind_addr.port <
1181 inet_prot_sock(net) &&
1182 !ns_capable(net->user_ns,
1183 CAP_NET_BIND_SERVICE)) {
1189 scope = sctp_scope(&to);
1190 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1196 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1204 /* Prime the peer's transport structures. */
1205 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1213 addr_buf += af->sockaddr_len;
1214 walk_size += af->sockaddr_len;
1217 /* In case the user of sctp_connectx() wants an association
1218 * id back, assign one now.
1221 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1226 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1231 /* Initialize sk's dport and daddr for getpeername() */
1232 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1233 sp->pf->to_sk_daddr(sa_addr, sk);
1236 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1239 *assoc_id = asoc->assoc_id;
1241 err = sctp_wait_for_connect(asoc, &timeo);
1242 /* Note: the asoc may be freed after the return of
1243 * sctp_wait_for_connect.
1246 /* Don't free association on exit. */
1250 pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251 __func__, asoc, kaddrs, err);
1254 /* sctp_primitive_ASSOCIATE may have added this association
1255 * To the hash table, try to unhash it, just in case, its a noop
1256 * if it wasn't hashed so we're safe
1258 sctp_association_free(asoc);
1263 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1266 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1267 * sctp_assoc_t *asoc);
1269 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1270 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1271 * or IPv6 addresses.
1273 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1274 * Section 3.1.2 for this usage.
1276 * addrs is a pointer to an array of one or more socket addresses. Each
1277 * address is contained in its appropriate structure (i.e. struct
1278 * sockaddr_in or struct sockaddr_in6) the family of the address type
1279 * must be used to distengish the address length (note that this
1280 * representation is termed a "packed array" of addresses). The caller
1281 * specifies the number of addresses in the array with addrcnt.
1283 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1284 * the association id of the new association. On failure, sctp_connectx()
1285 * returns -1, and sets errno to the appropriate error code. The assoc_id
1286 * is not touched by the kernel.
1288 * For SCTP, the port given in each socket address must be the same, or
1289 * sctp_connectx() will fail, setting errno to EINVAL.
1291 * An application can use sctp_connectx to initiate an association with
1292 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1293 * allows a caller to specify multiple addresses at which a peer can be
1294 * reached. The way the SCTP stack uses the list of addresses to set up
1295 * the association is implementation dependent. This function only
1296 * specifies that the stack will try to make use of all the addresses in
1297 * the list when needed.
1299 * Note that the list of addresses passed in is only used for setting up
1300 * the association. It does not necessarily equal the set of addresses
1301 * the peer uses for the resulting association. If the caller wants to
1302 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1303 * retrieve them after the association has been set up.
1305 * Basically do nothing but copying the addresses from user to kernel
1306 * land and invoking either sctp_connectx(). This is used for tunneling
1307 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1309 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1312 * sk The sk of the socket
1313 * addrs The pointer to the addresses in user land
1314 * addrssize Size of the addrs buffer
1316 * Returns >=0 if ok, <0 errno code on error.
1318 static int __sctp_setsockopt_connectx(struct sock *sk,
1319 struct sockaddr __user *addrs,
1321 sctp_assoc_t *assoc_id)
1323 struct sockaddr *kaddrs;
1324 int err = 0, flags = 0;
1326 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1327 __func__, sk, addrs, addrs_size);
1329 if (unlikely(addrs_size <= 0))
1332 kaddrs = memdup_user(addrs, addrs_size);
1333 if (unlikely(IS_ERR(kaddrs)))
1334 return PTR_ERR(kaddrs);
1336 /* Allow security module to validate connectx addresses. */
1337 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1338 (struct sockaddr *)kaddrs,
1343 /* in-kernel sockets don't generally have a file allocated to them
1344 * if all they do is call sock_create_kern().
1346 if (sk->sk_socket->file)
1347 flags = sk->sk_socket->file->f_flags;
1349 err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1358 * This is an older interface. It's kept for backward compatibility
1359 * to the option that doesn't provide association id.
1361 static int sctp_setsockopt_connectx_old(struct sock *sk,
1362 struct sockaddr __user *addrs,
1365 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1369 * New interface for the API. The since the API is done with a socket
1370 * option, to make it simple we feed back the association id is as a return
1371 * indication to the call. Error is always negative and association id is
1374 static int sctp_setsockopt_connectx(struct sock *sk,
1375 struct sockaddr __user *addrs,
1378 sctp_assoc_t assoc_id = 0;
1381 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1390 * New (hopefully final) interface for the API.
1391 * We use the sctp_getaddrs_old structure so that use-space library
1392 * can avoid any unnecessary allocations. The only different part
1393 * is that we store the actual length of the address buffer into the
1394 * addrs_num structure member. That way we can re-use the existing
1397 #ifdef CONFIG_COMPAT
1398 struct compat_sctp_getaddrs_old {
1399 sctp_assoc_t assoc_id;
1401 compat_uptr_t addrs; /* struct sockaddr * */
1405 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1406 char __user *optval,
1409 struct sctp_getaddrs_old param;
1410 sctp_assoc_t assoc_id = 0;
1413 #ifdef CONFIG_COMPAT
1414 if (in_compat_syscall()) {
1415 struct compat_sctp_getaddrs_old param32;
1417 if (len < sizeof(param32))
1419 if (copy_from_user(¶m32, optval, sizeof(param32)))
1422 param.assoc_id = param32.assoc_id;
1423 param.addr_num = param32.addr_num;
1424 param.addrs = compat_ptr(param32.addrs);
1428 if (len < sizeof(param))
1430 if (copy_from_user(¶m, optval, sizeof(param)))
1434 err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1435 param.addrs, param.addr_num,
1437 if (err == 0 || err == -EINPROGRESS) {
1438 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1440 if (put_user(sizeof(assoc_id), optlen))
1447 /* API 3.1.4 close() - UDP Style Syntax
1448 * Applications use close() to perform graceful shutdown (as described in
1449 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1450 * by a UDP-style socket.
1454 * ret = close(int sd);
1456 * sd - the socket descriptor of the associations to be closed.
1458 * To gracefully shutdown a specific association represented by the
1459 * UDP-style socket, an application should use the sendmsg() call,
1460 * passing no user data, but including the appropriate flag in the
1461 * ancillary data (see Section xxxx).
1463 * If sd in the close() call is a branched-off socket representing only
1464 * one association, the shutdown is performed on that association only.
1466 * 4.1.6 close() - TCP Style Syntax
1468 * Applications use close() to gracefully close down an association.
1472 * int close(int sd);
1474 * sd - the socket descriptor of the association to be closed.
1476 * After an application calls close() on a socket descriptor, no further
1477 * socket operations will succeed on that descriptor.
1479 * API 7.1.4 SO_LINGER
1481 * An application using the TCP-style socket can use this option to
1482 * perform the SCTP ABORT primitive. The linger option structure is:
1485 * int l_onoff; // option on/off
1486 * int l_linger; // linger time
1489 * To enable the option, set l_onoff to 1. If the l_linger value is set
1490 * to 0, calling close() is the same as the ABORT primitive. If the
1491 * value is set to a negative value, the setsockopt() call will return
1492 * an error. If the value is set to a positive value linger_time, the
1493 * close() can be blocked for at most linger_time ms. If the graceful
1494 * shutdown phase does not finish during this period, close() will
1495 * return but the graceful shutdown phase continues in the system.
1497 static void sctp_close(struct sock *sk, long timeout)
1499 struct net *net = sock_net(sk);
1500 struct sctp_endpoint *ep;
1501 struct sctp_association *asoc;
1502 struct list_head *pos, *temp;
1503 unsigned int data_was_unread;
1505 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1507 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1508 sk->sk_shutdown = SHUTDOWN_MASK;
1509 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1511 ep = sctp_sk(sk)->ep;
1513 /* Clean up any skbs sitting on the receive queue. */
1514 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1515 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1517 /* Walk all associations on an endpoint. */
1518 list_for_each_safe(pos, temp, &ep->asocs) {
1519 asoc = list_entry(pos, struct sctp_association, asocs);
1521 if (sctp_style(sk, TCP)) {
1522 /* A closed association can still be in the list if
1523 * it belongs to a TCP-style listening socket that is
1524 * not yet accepted. If so, free it. If not, send an
1525 * ABORT or SHUTDOWN based on the linger options.
1527 if (sctp_state(asoc, CLOSED)) {
1528 sctp_association_free(asoc);
1533 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1534 !skb_queue_empty(&asoc->ulpq.reasm) ||
1535 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1536 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1537 struct sctp_chunk *chunk;
1539 chunk = sctp_make_abort_user(asoc, NULL, 0);
1540 sctp_primitive_ABORT(net, asoc, chunk);
1542 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1545 /* On a TCP-style socket, block for at most linger_time if set. */
1546 if (sctp_style(sk, TCP) && timeout)
1547 sctp_wait_for_close(sk, timeout);
1549 /* This will run the backlog queue. */
1552 /* Supposedly, no process has access to the socket, but
1553 * the net layers still may.
1554 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1555 * held and that should be grabbed before socket lock.
1557 spin_lock_bh(&net->sctp.addr_wq_lock);
1558 bh_lock_sock_nested(sk);
1560 /* Hold the sock, since sk_common_release() will put sock_put()
1561 * and we have just a little more cleanup.
1564 sk_common_release(sk);
1567 spin_unlock_bh(&net->sctp.addr_wq_lock);
1571 SCTP_DBG_OBJCNT_DEC(sock);
1574 /* Handle EPIPE error. */
1575 static int sctp_error(struct sock *sk, int flags, int err)
1578 err = sock_error(sk) ? : -EPIPE;
1579 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1580 send_sig(SIGPIPE, current, 0);
1584 /* API 3.1.3 sendmsg() - UDP Style Syntax
1586 * An application uses sendmsg() and recvmsg() calls to transmit data to
1587 * and receive data from its peer.
1589 * ssize_t sendmsg(int socket, const struct msghdr *message,
1592 * socket - the socket descriptor of the endpoint.
1593 * message - pointer to the msghdr structure which contains a single
1594 * user message and possibly some ancillary data.
1596 * See Section 5 for complete description of the data
1599 * flags - flags sent or received with the user message, see Section
1600 * 5 for complete description of the flags.
1602 * Note: This function could use a rewrite especially when explicit
1603 * connect support comes in.
1605 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1607 static int sctp_msghdr_parse(const struct msghdr *msg,
1608 struct sctp_cmsgs *cmsgs);
1610 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1611 struct sctp_sndrcvinfo *srinfo,
1612 const struct msghdr *msg, size_t msg_len)
1617 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1620 if (msg_len > sk->sk_sndbuf)
1623 memset(cmsgs, 0, sizeof(*cmsgs));
1624 err = sctp_msghdr_parse(msg, cmsgs);
1626 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1630 memset(srinfo, 0, sizeof(*srinfo));
1631 if (cmsgs->srinfo) {
1632 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1633 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1634 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1635 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1636 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1637 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1641 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1642 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1643 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1644 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1645 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1648 if (cmsgs->prinfo) {
1649 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1650 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1651 cmsgs->prinfo->pr_policy);
1654 sflags = srinfo->sinfo_flags;
1655 if (!sflags && msg_len)
1658 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1661 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1662 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1665 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1671 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1672 struct sctp_cmsgs *cmsgs,
1673 union sctp_addr *daddr,
1674 struct sctp_transport **tp)
1676 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1677 struct net *net = sock_net(sk);
1678 struct sctp_association *asoc;
1679 enum sctp_scope scope;
1680 struct cmsghdr *cmsg;
1681 __be32 flowinfo = 0;
1687 if (sflags & (SCTP_EOF | SCTP_ABORT))
1690 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1691 sctp_sstate(sk, CLOSING)))
1692 return -EADDRNOTAVAIL;
1694 if (sctp_endpoint_is_peeled_off(ep, daddr))
1695 return -EADDRNOTAVAIL;
1697 if (!ep->base.bind_addr.port) {
1698 if (sctp_autobind(sk))
1701 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1702 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1706 scope = sctp_scope(daddr);
1708 /* Label connection socket for first association 1-to-many
1709 * style for client sequence socket()->sendmsg(). This
1710 * needs to be done before sctp_assoc_add_peer() as that will
1711 * set up the initial packet that needs to account for any
1712 * security ip options (CIPSO/CALIPSO) added to the packet.
1714 af = sctp_get_af_specific(daddr->sa.sa_family);
1717 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1718 (struct sockaddr *)daddr,
1723 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1727 if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1733 struct sctp_initmsg *init = cmsgs->init;
1735 if (init->sinit_num_ostreams) {
1736 __u16 outcnt = init->sinit_num_ostreams;
1738 asoc->c.sinit_num_ostreams = outcnt;
1739 /* outcnt has been changed, need to re-init stream */
1740 err = sctp_stream_init(&asoc->stream, outcnt, 0,
1746 if (init->sinit_max_instreams)
1747 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1749 if (init->sinit_max_attempts)
1750 asoc->max_init_attempts = init->sinit_max_attempts;
1752 if (init->sinit_max_init_timeo)
1753 asoc->max_init_timeo =
1754 msecs_to_jiffies(init->sinit_max_init_timeo);
1757 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1763 if (!cmsgs->addrs_msg)
1766 if (daddr->sa.sa_family == AF_INET6)
1767 flowinfo = daddr->v6.sin6_flowinfo;
1769 /* sendv addr list parse */
1770 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1771 struct sctp_transport *transport;
1772 struct sctp_association *old;
1773 union sctp_addr _daddr;
1776 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1777 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1778 cmsg->cmsg_type != SCTP_DSTADDRV6))
1782 memset(daddr, 0, sizeof(*daddr));
1783 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1784 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1785 if (dlen < sizeof(struct in_addr)) {
1790 dlen = sizeof(struct in_addr);
1791 daddr->v4.sin_family = AF_INET;
1792 daddr->v4.sin_port = htons(asoc->peer.port);
1793 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1795 if (dlen < sizeof(struct in6_addr)) {
1800 dlen = sizeof(struct in6_addr);
1801 daddr->v6.sin6_flowinfo = flowinfo;
1802 daddr->v6.sin6_family = AF_INET6;
1803 daddr->v6.sin6_port = htons(asoc->peer.port);
1804 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1806 err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
1810 old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1811 if (old && old != asoc) {
1812 if (old->state >= SCTP_STATE_ESTABLISHED)
1819 if (sctp_endpoint_is_peeled_off(ep, daddr)) {
1820 err = -EADDRNOTAVAIL;
1824 transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
1835 sctp_association_free(asoc);
1839 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1840 __u16 sflags, struct msghdr *msg,
1843 struct sock *sk = asoc->base.sk;
1844 struct net *net = sock_net(sk);
1846 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1849 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1850 !sctp_state(asoc, ESTABLISHED))
1853 if (sflags & SCTP_EOF) {
1854 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1855 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1860 if (sflags & SCTP_ABORT) {
1861 struct sctp_chunk *chunk;
1863 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1867 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1868 sctp_primitive_ABORT(net, asoc, chunk);
1869 iov_iter_revert(&msg->msg_iter, msg_len);
1877 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1878 struct msghdr *msg, size_t msg_len,
1879 struct sctp_transport *transport,
1880 struct sctp_sndrcvinfo *sinfo)
1882 struct sock *sk = asoc->base.sk;
1883 struct sctp_sock *sp = sctp_sk(sk);
1884 struct net *net = sock_net(sk);
1885 struct sctp_datamsg *datamsg;
1886 bool wait_connect = false;
1887 struct sctp_chunk *chunk;
1891 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1896 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1897 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1902 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1907 if (asoc->pmtu_pending) {
1908 if (sp->param_flags & SPP_PMTUD_ENABLE)
1909 sctp_assoc_sync_pmtu(asoc);
1910 asoc->pmtu_pending = 0;
1913 if (sctp_wspace(asoc) < (int)msg_len)
1914 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1916 if (sk_under_memory_pressure(sk))
1919 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1920 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1921 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1926 if (sctp_state(asoc, CLOSED)) {
1927 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1931 if (sp->strm_interleave) {
1932 timeo = sock_sndtimeo(sk, 0);
1933 err = sctp_wait_for_connect(asoc, &timeo);
1939 wait_connect = true;
1942 pr_debug("%s: we associated primitively\n", __func__);
1945 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1946 if (IS_ERR(datamsg)) {
1947 err = PTR_ERR(datamsg);
1951 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1953 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1954 sctp_chunk_hold(chunk);
1955 sctp_set_owner_w(chunk);
1956 chunk->transport = transport;
1959 err = sctp_primitive_SEND(net, asoc, datamsg);
1961 sctp_datamsg_free(datamsg);
1965 pr_debug("%s: we sent primitively\n", __func__);
1967 sctp_datamsg_put(datamsg);
1969 if (unlikely(wait_connect)) {
1970 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1971 sctp_wait_for_connect(asoc, &timeo);
1980 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1981 const struct msghdr *msg,
1982 struct sctp_cmsgs *cmsgs)
1984 union sctp_addr *daddr = NULL;
1987 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1988 int len = msg->msg_namelen;
1990 if (len > sizeof(*daddr))
1991 len = sizeof(*daddr);
1993 daddr = (union sctp_addr *)msg->msg_name;
1995 err = sctp_verify_addr(sk, daddr, len);
1997 return ERR_PTR(err);
2003 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2004 struct sctp_sndrcvinfo *sinfo,
2005 struct sctp_cmsgs *cmsgs)
2007 if (!cmsgs->srinfo && !cmsgs->sinfo) {
2008 sinfo->sinfo_stream = asoc->default_stream;
2009 sinfo->sinfo_ppid = asoc->default_ppid;
2010 sinfo->sinfo_context = asoc->default_context;
2011 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2014 sinfo->sinfo_flags = asoc->default_flags;
2017 if (!cmsgs->srinfo && !cmsgs->prinfo)
2018 sinfo->sinfo_timetolive = asoc->default_timetolive;
2020 if (cmsgs->authinfo) {
2021 /* Reuse sinfo_tsn to indicate that authinfo was set and
2022 * sinfo_ssn to save the keyid on tx path.
2024 sinfo->sinfo_tsn = 1;
2025 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2029 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2031 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2032 struct sctp_transport *transport = NULL;
2033 struct sctp_sndrcvinfo _sinfo, *sinfo;
2034 struct sctp_association *asoc, *tmp;
2035 struct sctp_cmsgs cmsgs;
2036 union sctp_addr *daddr;
2041 /* Parse and get snd_info */
2042 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2047 sflags = sinfo->sinfo_flags;
2049 /* Get daddr from msg */
2050 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2051 if (IS_ERR(daddr)) {
2052 err = PTR_ERR(daddr);
2058 /* SCTP_SENDALL process */
2059 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2060 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
2061 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2068 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2070 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2075 iov_iter_revert(&msg->msg_iter, err);
2081 /* Get and check or create asoc */
2083 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2085 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2090 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2095 asoc = transport->asoc;
2099 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2102 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2108 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2113 /* Update snd_info with the asoc */
2114 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2116 /* Send msg to the asoc */
2117 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2118 if (err < 0 && err != -ESRCH && new)
2119 sctp_association_free(asoc);
2124 return sctp_error(sk, msg->msg_flags, err);
2127 /* This is an extended version of skb_pull() that removes the data from the
2128 * start of a skb even when data is spread across the list of skb's in the
2129 * frag_list. len specifies the total amount of data that needs to be removed.
2130 * when 'len' bytes could be removed from the skb, it returns 0.
2131 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2132 * could not be removed.
2134 static int sctp_skb_pull(struct sk_buff *skb, int len)
2136 struct sk_buff *list;
2137 int skb_len = skb_headlen(skb);
2140 if (len <= skb_len) {
2141 __skb_pull(skb, len);
2145 __skb_pull(skb, skb_len);
2147 skb_walk_frags(skb, list) {
2148 rlen = sctp_skb_pull(list, len);
2149 skb->len -= (len-rlen);
2150 skb->data_len -= (len-rlen);
2161 /* API 3.1.3 recvmsg() - UDP Style Syntax
2163 * ssize_t recvmsg(int socket, struct msghdr *message,
2166 * socket - the socket descriptor of the endpoint.
2167 * message - pointer to the msghdr structure which contains a single
2168 * user message and possibly some ancillary data.
2170 * See Section 5 for complete description of the data
2173 * flags - flags sent or received with the user message, see Section
2174 * 5 for complete description of the flags.
2176 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2177 int noblock, int flags, int *addr_len)
2179 struct sctp_ulpevent *event = NULL;
2180 struct sctp_sock *sp = sctp_sk(sk);
2181 struct sk_buff *skb, *head_skb;
2186 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2187 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2192 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2193 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2198 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2202 /* Get the total length of the skb including any skb's in the
2211 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2213 event = sctp_skb2event(skb);
2218 if (event->chunk && event->chunk->head_skb)
2219 head_skb = event->chunk->head_skb;
2222 sock_recv_ts_and_drops(msg, sk, head_skb);
2223 if (sctp_ulpevent_is_notification(event)) {
2224 msg->msg_flags |= MSG_NOTIFICATION;
2225 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2227 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2230 /* Check if we allow SCTP_NXTINFO. */
2231 if (sp->recvnxtinfo)
2232 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2233 /* Check if we allow SCTP_RCVINFO. */
2234 if (sp->recvrcvinfo)
2235 sctp_ulpevent_read_rcvinfo(event, msg);
2236 /* Check if we allow SCTP_SNDRCVINFO. */
2237 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2238 sctp_ulpevent_read_sndrcvinfo(event, msg);
2242 /* If skb's length exceeds the user's buffer, update the skb and
2243 * push it back to the receive_queue so that the next call to
2244 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2246 if (skb_len > copied) {
2247 msg->msg_flags &= ~MSG_EOR;
2248 if (flags & MSG_PEEK)
2250 sctp_skb_pull(skb, copied);
2251 skb_queue_head(&sk->sk_receive_queue, skb);
2253 /* When only partial message is copied to the user, increase
2254 * rwnd by that amount. If all the data in the skb is read,
2255 * rwnd is updated when the event is freed.
2257 if (!sctp_ulpevent_is_notification(event))
2258 sctp_assoc_rwnd_increase(event->asoc, copied);
2260 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2261 (event->msg_flags & MSG_EOR))
2262 msg->msg_flags |= MSG_EOR;
2264 msg->msg_flags &= ~MSG_EOR;
2267 if (flags & MSG_PEEK) {
2268 /* Release the skb reference acquired after peeking the skb in
2269 * sctp_skb_recv_datagram().
2273 /* Free the event which includes releasing the reference to
2274 * the owner of the skb, freeing the skb and updating the
2277 sctp_ulpevent_free(event);
2284 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2286 * This option is a on/off flag. If enabled no SCTP message
2287 * fragmentation will be performed. Instead if a message being sent
2288 * exceeds the current PMTU size, the message will NOT be sent and
2289 * instead a error will be indicated to the user.
2291 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2292 char __user *optval,
2293 unsigned int optlen)
2297 if (optlen < sizeof(int))
2300 if (get_user(val, (int __user *)optval))
2303 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2308 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2309 unsigned int optlen)
2311 struct sctp_event_subscribe subscribe;
2312 __u8 *sn_type = (__u8 *)&subscribe;
2313 struct sctp_sock *sp = sctp_sk(sk);
2314 struct sctp_association *asoc;
2317 if (optlen > sizeof(struct sctp_event_subscribe))
2320 if (copy_from_user(&subscribe, optval, optlen))
2323 for (i = 0; i < optlen; i++)
2324 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2327 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2328 asoc->subscribe = sctp_sk(sk)->subscribe;
2330 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2331 * if there is no data to be sent or retransmit, the stack will
2332 * immediately send up this notification.
2334 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2335 struct sctp_ulpevent *event;
2337 asoc = sctp_id2assoc(sk, 0);
2338 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2339 event = sctp_ulpevent_make_sender_dry_event(asoc,
2340 GFP_USER | __GFP_NOWARN);
2344 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2351 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2353 * This socket option is applicable to the UDP-style socket only. When
2354 * set it will cause associations that are idle for more than the
2355 * specified number of seconds to automatically close. An association
2356 * being idle is defined an association that has NOT sent or received
2357 * user data. The special value of '0' indicates that no automatic
2358 * close of any associations should be performed. The option expects an
2359 * integer defining the number of seconds of idle time before an
2360 * association is closed.
2362 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2363 unsigned int optlen)
2365 struct sctp_sock *sp = sctp_sk(sk);
2366 struct net *net = sock_net(sk);
2368 /* Applicable to UDP-style socket only */
2369 if (sctp_style(sk, TCP))
2371 if (optlen != sizeof(int))
2373 if (copy_from_user(&sp->autoclose, optval, optlen))
2376 if (sp->autoclose > net->sctp.max_autoclose)
2377 sp->autoclose = net->sctp.max_autoclose;
2382 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2384 * Applications can enable or disable heartbeats for any peer address of
2385 * an association, modify an address's heartbeat interval, force a
2386 * heartbeat to be sent immediately, and adjust the address's maximum
2387 * number of retransmissions sent before an address is considered
2388 * unreachable. The following structure is used to access and modify an
2389 * address's parameters:
2391 * struct sctp_paddrparams {
2392 * sctp_assoc_t spp_assoc_id;
2393 * struct sockaddr_storage spp_address;
2394 * uint32_t spp_hbinterval;
2395 * uint16_t spp_pathmaxrxt;
2396 * uint32_t spp_pathmtu;
2397 * uint32_t spp_sackdelay;
2398 * uint32_t spp_flags;
2399 * uint32_t spp_ipv6_flowlabel;
2403 * spp_assoc_id - (one-to-many style socket) This is filled in the
2404 * application, and identifies the association for
2406 * spp_address - This specifies which address is of interest.
2407 * spp_hbinterval - This contains the value of the heartbeat interval,
2408 * in milliseconds. If a value of zero
2409 * is present in this field then no changes are to
2410 * be made to this parameter.
2411 * spp_pathmaxrxt - This contains the maximum number of
2412 * retransmissions before this address shall be
2413 * considered unreachable. If a value of zero
2414 * is present in this field then no changes are to
2415 * be made to this parameter.
2416 * spp_pathmtu - When Path MTU discovery is disabled the value
2417 * specified here will be the "fixed" path mtu.
2418 * Note that if the spp_address field is empty
2419 * then all associations on this address will
2420 * have this fixed path mtu set upon them.
2422 * spp_sackdelay - When delayed sack is enabled, this value specifies
2423 * the number of milliseconds that sacks will be delayed
2424 * for. This value will apply to all addresses of an
2425 * association if the spp_address field is empty. Note
2426 * also, that if delayed sack is enabled and this
2427 * value is set to 0, no change is made to the last
2428 * recorded delayed sack timer value.
2430 * spp_flags - These flags are used to control various features
2431 * on an association. The flag field may contain
2432 * zero or more of the following options.
2434 * SPP_HB_ENABLE - Enable heartbeats on the
2435 * specified address. Note that if the address
2436 * field is empty all addresses for the association
2437 * have heartbeats enabled upon them.
2439 * SPP_HB_DISABLE - Disable heartbeats on the
2440 * speicifed address. Note that if the address
2441 * field is empty all addresses for the association
2442 * will have their heartbeats disabled. Note also
2443 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2444 * mutually exclusive, only one of these two should
2445 * be specified. Enabling both fields will have
2446 * undetermined results.
2448 * SPP_HB_DEMAND - Request a user initiated heartbeat
2449 * to be made immediately.
2451 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2452 * heartbeat delayis to be set to the value of 0
2455 * SPP_PMTUD_ENABLE - This field will enable PMTU
2456 * discovery upon the specified address. Note that
2457 * if the address feild is empty then all addresses
2458 * on the association are effected.
2460 * SPP_PMTUD_DISABLE - This field will disable PMTU
2461 * discovery upon the specified address. Note that
2462 * if the address feild is empty then all addresses
2463 * on the association are effected. Not also that
2464 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2465 * exclusive. Enabling both will have undetermined
2468 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2469 * on delayed sack. The time specified in spp_sackdelay
2470 * is used to specify the sack delay for this address. Note
2471 * that if spp_address is empty then all addresses will
2472 * enable delayed sack and take on the sack delay
2473 * value specified in spp_sackdelay.
2474 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2475 * off delayed sack. If the spp_address field is blank then
2476 * delayed sack is disabled for the entire association. Note
2477 * also that this field is mutually exclusive to
2478 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2481 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2482 * setting of the IPV6 flow label value. The value is
2483 * contained in the spp_ipv6_flowlabel field.
2484 * Upon retrieval, this flag will be set to indicate that
2485 * the spp_ipv6_flowlabel field has a valid value returned.
2486 * If a specific destination address is set (in the
2487 * spp_address field), then the value returned is that of
2488 * the address. If just an association is specified (and
2489 * no address), then the association's default flow label
2490 * is returned. If neither an association nor a destination
2491 * is specified, then the socket's default flow label is
2492 * returned. For non-IPv6 sockets, this flag will be left
2495 * SPP_DSCP: Setting this flag enables the setting of the
2496 * Differentiated Services Code Point (DSCP) value
2497 * associated with either the association or a specific
2498 * address. The value is obtained in the spp_dscp field.
2499 * Upon retrieval, this flag will be set to indicate that
2500 * the spp_dscp field has a valid value returned. If a
2501 * specific destination address is set when called (in the
2502 * spp_address field), then that specific destination
2503 * address's DSCP value is returned. If just an association
2504 * is specified, then the association's default DSCP is
2505 * returned. If neither an association nor a destination is
2506 * specified, then the socket's default DSCP is returned.
2508 * spp_ipv6_flowlabel
2509 * - This field is used in conjunction with the
2510 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2511 * The 20 least significant bits are used for the flow
2512 * label. This setting has precedence over any IPv6-layer
2515 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2516 * and contains the DSCP. The 6 most significant bits are
2517 * used for the DSCP. This setting has precedence over any
2518 * IPv4- or IPv6- layer setting.
2520 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2521 struct sctp_transport *trans,
2522 struct sctp_association *asoc,
2523 struct sctp_sock *sp,
2526 int sackdelay_change)
2530 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2531 struct net *net = sock_net(trans->asoc->base.sk);
2533 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2538 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2539 * this field is ignored. Note also that a value of zero indicates
2540 * the current setting should be left unchanged.
2542 if (params->spp_flags & SPP_HB_ENABLE) {
2544 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2545 * set. This lets us use 0 value when this flag
2548 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2549 params->spp_hbinterval = 0;
2551 if (params->spp_hbinterval ||
2552 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2555 msecs_to_jiffies(params->spp_hbinterval);
2558 msecs_to_jiffies(params->spp_hbinterval);
2560 sp->hbinterval = params->spp_hbinterval;
2567 trans->param_flags =
2568 (trans->param_flags & ~SPP_HB) | hb_change;
2571 (asoc->param_flags & ~SPP_HB) | hb_change;
2574 (sp->param_flags & ~SPP_HB) | hb_change;
2578 /* When Path MTU discovery is disabled the value specified here will
2579 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2580 * include the flag SPP_PMTUD_DISABLE for this field to have any
2583 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2585 trans->pathmtu = params->spp_pathmtu;
2586 sctp_assoc_sync_pmtu(asoc);
2588 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2590 sp->pathmtu = params->spp_pathmtu;
2596 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2597 (params->spp_flags & SPP_PMTUD_ENABLE);
2598 trans->param_flags =
2599 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2601 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2602 sctp_assoc_sync_pmtu(asoc);
2606 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2609 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2613 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2614 * value of this field is ignored. Note also that a value of zero
2615 * indicates the current setting should be left unchanged.
2617 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2620 msecs_to_jiffies(params->spp_sackdelay);
2623 msecs_to_jiffies(params->spp_sackdelay);
2625 sp->sackdelay = params->spp_sackdelay;
2629 if (sackdelay_change) {
2631 trans->param_flags =
2632 (trans->param_flags & ~SPP_SACKDELAY) |
2636 (asoc->param_flags & ~SPP_SACKDELAY) |
2640 (sp->param_flags & ~SPP_SACKDELAY) |
2645 /* Note that a value of zero indicates the current setting should be
2648 if (params->spp_pathmaxrxt) {
2650 trans->pathmaxrxt = params->spp_pathmaxrxt;
2652 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2654 sp->pathmaxrxt = params->spp_pathmaxrxt;
2658 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2660 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2661 trans->flowlabel = params->spp_ipv6_flowlabel &
2662 SCTP_FLOWLABEL_VAL_MASK;
2663 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2666 struct sctp_transport *t;
2668 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2670 if (t->ipaddr.sa.sa_family != AF_INET6)
2672 t->flowlabel = params->spp_ipv6_flowlabel &
2673 SCTP_FLOWLABEL_VAL_MASK;
2674 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2676 asoc->flowlabel = params->spp_ipv6_flowlabel &
2677 SCTP_FLOWLABEL_VAL_MASK;
2678 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2679 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2680 sp->flowlabel = params->spp_ipv6_flowlabel &
2681 SCTP_FLOWLABEL_VAL_MASK;
2682 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2686 if (params->spp_flags & SPP_DSCP) {
2688 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2689 trans->dscp |= SCTP_DSCP_SET_MASK;
2691 struct sctp_transport *t;
2693 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2695 t->dscp = params->spp_dscp &
2697 t->dscp |= SCTP_DSCP_SET_MASK;
2699 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2700 asoc->dscp |= SCTP_DSCP_SET_MASK;
2702 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2703 sp->dscp |= SCTP_DSCP_SET_MASK;
2710 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2711 char __user *optval,
2712 unsigned int optlen)
2714 struct sctp_paddrparams params;
2715 struct sctp_transport *trans = NULL;
2716 struct sctp_association *asoc = NULL;
2717 struct sctp_sock *sp = sctp_sk(sk);
2719 int hb_change, pmtud_change, sackdelay_change;
2721 if (optlen == sizeof(params)) {
2722 if (copy_from_user(¶ms, optval, optlen))
2724 } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2725 spp_ipv6_flowlabel), 4)) {
2726 if (copy_from_user(¶ms, optval, optlen))
2728 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2734 /* Validate flags and value parameters. */
2735 hb_change = params.spp_flags & SPP_HB;
2736 pmtud_change = params.spp_flags & SPP_PMTUD;
2737 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2739 if (hb_change == SPP_HB ||
2740 pmtud_change == SPP_PMTUD ||
2741 sackdelay_change == SPP_SACKDELAY ||
2742 params.spp_sackdelay > 500 ||
2743 (params.spp_pathmtu &&
2744 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2747 /* If an address other than INADDR_ANY is specified, and
2748 * no transport is found, then the request is invalid.
2750 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
2751 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2752 params.spp_assoc_id);
2757 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2758 * socket is a one to many style socket, and an association
2759 * was not found, then the id was invalid.
2761 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2762 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2763 sctp_style(sk, UDP))
2766 /* Heartbeat demand can only be sent on a transport or
2767 * association, but not a socket.
2769 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2772 /* Process parameters. */
2773 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2774 hb_change, pmtud_change,
2780 /* If changes are for association, also apply parameters to each
2783 if (!trans && asoc) {
2784 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2786 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2787 hb_change, pmtud_change,
2795 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2797 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2800 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2802 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2805 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2806 struct sctp_association *asoc)
2808 struct sctp_transport *trans;
2810 if (params->sack_delay) {
2811 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2813 sctp_spp_sackdelay_enable(asoc->param_flags);
2815 if (params->sack_freq == 1) {
2817 sctp_spp_sackdelay_disable(asoc->param_flags);
2818 } else if (params->sack_freq > 1) {
2819 asoc->sackfreq = params->sack_freq;
2821 sctp_spp_sackdelay_enable(asoc->param_flags);
2824 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2826 if (params->sack_delay) {
2827 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2828 trans->param_flags =
2829 sctp_spp_sackdelay_enable(trans->param_flags);
2831 if (params->sack_freq == 1) {
2832 trans->param_flags =
2833 sctp_spp_sackdelay_disable(trans->param_flags);
2834 } else if (params->sack_freq > 1) {
2835 trans->sackfreq = params->sack_freq;
2836 trans->param_flags =
2837 sctp_spp_sackdelay_enable(trans->param_flags);
2843 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2845 * This option will effect the way delayed acks are performed. This
2846 * option allows you to get or set the delayed ack time, in
2847 * milliseconds. It also allows changing the delayed ack frequency.
2848 * Changing the frequency to 1 disables the delayed sack algorithm. If
2849 * the assoc_id is 0, then this sets or gets the endpoints default
2850 * values. If the assoc_id field is non-zero, then the set or get
2851 * effects the specified association for the one to many model (the
2852 * assoc_id field is ignored by the one to one model). Note that if
2853 * sack_delay or sack_freq are 0 when setting this option, then the
2854 * current values will remain unchanged.
2856 * struct sctp_sack_info {
2857 * sctp_assoc_t sack_assoc_id;
2858 * uint32_t sack_delay;
2859 * uint32_t sack_freq;
2862 * sack_assoc_id - This parameter, indicates which association the user
2863 * is performing an action upon. Note that if this field's value is
2864 * zero then the endpoints default value is changed (effecting future
2865 * associations only).
2867 * sack_delay - This parameter contains the number of milliseconds that
2868 * the user is requesting the delayed ACK timer be set to. Note that
2869 * this value is defined in the standard to be between 200 and 500
2872 * sack_freq - This parameter contains the number of packets that must
2873 * be received before a sack is sent without waiting for the delay
2874 * timer to expire. The default value for this is 2, setting this
2875 * value to 1 will disable the delayed sack algorithm.
2878 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2879 char __user *optval, unsigned int optlen)
2881 struct sctp_sock *sp = sctp_sk(sk);
2882 struct sctp_association *asoc;
2883 struct sctp_sack_info params;
2885 if (optlen == sizeof(struct sctp_sack_info)) {
2886 if (copy_from_user(¶ms, optval, optlen))
2889 if (params.sack_delay == 0 && params.sack_freq == 0)
2891 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2892 pr_warn_ratelimited(DEPRECATED
2894 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2895 "Use struct sctp_sack_info instead\n",
2896 current->comm, task_pid_nr(current));
2897 if (copy_from_user(¶ms, optval, optlen))
2900 if (params.sack_delay == 0)
2901 params.sack_freq = 1;
2903 params.sack_freq = 0;
2907 /* Validate value parameter. */
2908 if (params.sack_delay > 500)
2911 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2912 * socket is a one to many style socket, and an association
2913 * was not found, then the id was invalid.
2915 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2916 if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2917 sctp_style(sk, UDP))
2921 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2926 if (sctp_style(sk, TCP))
2927 params.sack_assoc_id = SCTP_FUTURE_ASSOC;
2929 if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2930 params.sack_assoc_id == SCTP_ALL_ASSOC) {
2931 if (params.sack_delay) {
2932 sp->sackdelay = params.sack_delay;
2934 sctp_spp_sackdelay_enable(sp->param_flags);
2936 if (params.sack_freq == 1) {
2938 sctp_spp_sackdelay_disable(sp->param_flags);
2939 } else if (params.sack_freq > 1) {
2940 sp->sackfreq = params.sack_freq;
2942 sctp_spp_sackdelay_enable(sp->param_flags);
2946 if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2947 params.sack_assoc_id == SCTP_ALL_ASSOC)
2948 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2949 sctp_apply_asoc_delayed_ack(¶ms, asoc);
2954 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2956 * Applications can specify protocol parameters for the default association
2957 * initialization. The option name argument to setsockopt() and getsockopt()
2960 * Setting initialization parameters is effective only on an unconnected
2961 * socket (for UDP-style sockets only future associations are effected
2962 * by the change). With TCP-style sockets, this option is inherited by
2963 * sockets derived from a listener socket.
2965 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2967 struct sctp_initmsg sinit;
2968 struct sctp_sock *sp = sctp_sk(sk);
2970 if (optlen != sizeof(struct sctp_initmsg))
2972 if (copy_from_user(&sinit, optval, optlen))
2975 if (sinit.sinit_num_ostreams)
2976 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2977 if (sinit.sinit_max_instreams)
2978 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2979 if (sinit.sinit_max_attempts)
2980 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2981 if (sinit.sinit_max_init_timeo)
2982 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2988 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2990 * Applications that wish to use the sendto() system call may wish to
2991 * specify a default set of parameters that would normally be supplied
2992 * through the inclusion of ancillary data. This socket option allows
2993 * such an application to set the default sctp_sndrcvinfo structure.
2994 * The application that wishes to use this socket option simply passes
2995 * in to this call the sctp_sndrcvinfo structure defined in Section
2996 * 5.2.2) The input parameters accepted by this call include
2997 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2998 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2999 * to this call if the caller is using the UDP model.
3001 static int sctp_setsockopt_default_send_param(struct sock *sk,
3002 char __user *optval,
3003 unsigned int optlen)
3005 struct sctp_sock *sp = sctp_sk(sk);
3006 struct sctp_association *asoc;
3007 struct sctp_sndrcvinfo info;
3009 if (optlen != sizeof(info))
3011 if (copy_from_user(&info, optval, optlen))
3013 if (info.sinfo_flags &
3014 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3015 SCTP_ABORT | SCTP_EOF))
3018 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
3019 if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
3020 sctp_style(sk, UDP))
3024 asoc->default_stream = info.sinfo_stream;
3025 asoc->default_flags = info.sinfo_flags;
3026 asoc->default_ppid = info.sinfo_ppid;
3027 asoc->default_context = info.sinfo_context;
3028 asoc->default_timetolive = info.sinfo_timetolive;
3033 if (sctp_style(sk, TCP))
3034 info.sinfo_assoc_id = SCTP_FUTURE_ASSOC;
3036 if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
3037 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3038 sp->default_stream = info.sinfo_stream;
3039 sp->default_flags = info.sinfo_flags;
3040 sp->default_ppid = info.sinfo_ppid;
3041 sp->default_context = info.sinfo_context;
3042 sp->default_timetolive = info.sinfo_timetolive;
3045 if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
3046 info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3047 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3048 asoc->default_stream = info.sinfo_stream;
3049 asoc->default_flags = info.sinfo_flags;
3050 asoc->default_ppid = info.sinfo_ppid;
3051 asoc->default_context = info.sinfo_context;
3052 asoc->default_timetolive = info.sinfo_timetolive;
3059 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
3060 * (SCTP_DEFAULT_SNDINFO)
3062 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
3063 char __user *optval,
3064 unsigned int optlen)
3066 struct sctp_sock *sp = sctp_sk(sk);
3067 struct sctp_association *asoc;
3068 struct sctp_sndinfo info;
3070 if (optlen != sizeof(info))
3072 if (copy_from_user(&info, optval, optlen))
3074 if (info.snd_flags &
3075 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3076 SCTP_ABORT | SCTP_EOF))
3079 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
3080 if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
3081 sctp_style(sk, UDP))
3085 asoc->default_stream = info.snd_sid;
3086 asoc->default_flags = info.snd_flags;
3087 asoc->default_ppid = info.snd_ppid;
3088 asoc->default_context = info.snd_context;
3093 if (sctp_style(sk, TCP))
3094 info.snd_assoc_id = SCTP_FUTURE_ASSOC;
3096 if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
3097 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3098 sp->default_stream = info.snd_sid;
3099 sp->default_flags = info.snd_flags;
3100 sp->default_ppid = info.snd_ppid;
3101 sp->default_context = info.snd_context;
3104 if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3105 info.snd_assoc_id == SCTP_ALL_ASSOC) {
3106 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3107 asoc->default_stream = info.snd_sid;
3108 asoc->default_flags = info.snd_flags;
3109 asoc->default_ppid = info.snd_ppid;
3110 asoc->default_context = info.snd_context;
3117 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3119 * Requests that the local SCTP stack use the enclosed peer address as
3120 * the association primary. The enclosed address must be one of the
3121 * association peer's addresses.
3123 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3124 unsigned int optlen)
3126 struct sctp_prim prim;
3127 struct sctp_transport *trans;
3131 if (optlen != sizeof(struct sctp_prim))
3134 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3137 /* Allow security module to validate address but need address len. */
3138 af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3142 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3143 (struct sockaddr *)&prim.ssp_addr,
3148 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3152 sctp_assoc_set_primary(trans->asoc, trans);
3158 * 7.1.5 SCTP_NODELAY
3160 * Turn on/off any Nagle-like algorithm. This means that packets are
3161 * generally sent as soon as possible and no unnecessary delays are
3162 * introduced, at the cost of more packets in the network. Expects an
3163 * integer boolean flag.
3165 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3166 unsigned int optlen)
3170 if (optlen < sizeof(int))
3172 if (get_user(val, (int __user *)optval))
3175 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3181 * 7.1.1 SCTP_RTOINFO
3183 * The protocol parameters used to initialize and bound retransmission
3184 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3185 * and modify these parameters.
3186 * All parameters are time values, in milliseconds. A value of 0, when
3187 * modifying the parameters, indicates that the current value should not
3191 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3193 struct sctp_rtoinfo rtoinfo;
3194 struct sctp_association *asoc;
3195 unsigned long rto_min, rto_max;
3196 struct sctp_sock *sp = sctp_sk(sk);
3198 if (optlen != sizeof (struct sctp_rtoinfo))
3201 if (copy_from_user(&rtoinfo, optval, optlen))
3204 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3206 /* Set the values to the specific association */
3207 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3208 sctp_style(sk, UDP))
3211 rto_max = rtoinfo.srto_max;
3212 rto_min = rtoinfo.srto_min;
3215 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3217 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3220 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3222 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3224 if (rto_min > rto_max)
3228 if (rtoinfo.srto_initial != 0)
3230 msecs_to_jiffies(rtoinfo.srto_initial);
3231 asoc->rto_max = rto_max;
3232 asoc->rto_min = rto_min;
3234 /* If there is no association or the association-id = 0
3235 * set the values to the endpoint.
3237 if (rtoinfo.srto_initial != 0)
3238 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3239 sp->rtoinfo.srto_max = rto_max;
3240 sp->rtoinfo.srto_min = rto_min;
3248 * 7.1.2 SCTP_ASSOCINFO
3250 * This option is used to tune the maximum retransmission attempts
3251 * of the association.
3252 * Returns an error if the new association retransmission value is
3253 * greater than the sum of the retransmission value of the peer.
3254 * See [SCTP] for more information.
3257 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3260 struct sctp_assocparams assocparams;
3261 struct sctp_association *asoc;
3263 if (optlen != sizeof(struct sctp_assocparams))
3265 if (copy_from_user(&assocparams, optval, optlen))
3268 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3270 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3271 sctp_style(sk, UDP))
3274 /* Set the values to the specific association */
3276 if (assocparams.sasoc_asocmaxrxt != 0) {
3279 struct sctp_transport *peer_addr;
3281 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3283 path_sum += peer_addr->pathmaxrxt;
3287 /* Only validate asocmaxrxt if we have more than
3288 * one path/transport. We do this because path
3289 * retransmissions are only counted when we have more
3293 assocparams.sasoc_asocmaxrxt > path_sum)
3296 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3299 if (assocparams.sasoc_cookie_life != 0)
3300 asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3302 /* Set the values to the endpoint */
3303 struct sctp_sock *sp = sctp_sk(sk);
3305 if (assocparams.sasoc_asocmaxrxt != 0)
3306 sp->assocparams.sasoc_asocmaxrxt =
3307 assocparams.sasoc_asocmaxrxt;
3308 if (assocparams.sasoc_cookie_life != 0)
3309 sp->assocparams.sasoc_cookie_life =
3310 assocparams.sasoc_cookie_life;
3316 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3318 * This socket option is a boolean flag which turns on or off mapped V4
3319 * addresses. If this option is turned on and the socket is type
3320 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3321 * If this option is turned off, then no mapping will be done of V4
3322 * addresses and a user will receive both PF_INET6 and PF_INET type
3323 * addresses on the socket.
3325 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3328 struct sctp_sock *sp = sctp_sk(sk);
3330 if (optlen < sizeof(int))
3332 if (get_user(val, (int __user *)optval))
3343 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3344 * This option will get or set the maximum size to put in any outgoing
3345 * SCTP DATA chunk. If a message is larger than this size it will be
3346 * fragmented by SCTP into the specified size. Note that the underlying
3347 * SCTP implementation may fragment into smaller sized chunks when the
3348 * PMTU of the underlying association is smaller than the value set by
3349 * the user. The default value for this option is '0' which indicates
3350 * the user is NOT limiting fragmentation and only the PMTU will effect
3351 * SCTP's choice of DATA chunk size. Note also that values set larger
3352 * than the maximum size of an IP datagram will effectively let SCTP
3353 * control fragmentation (i.e. the same as setting this option to 0).
3355 * The following structure is used to access and modify this parameter:
3357 * struct sctp_assoc_value {
3358 * sctp_assoc_t assoc_id;
3359 * uint32_t assoc_value;
3362 * assoc_id: This parameter is ignored for one-to-one style sockets.
3363 * For one-to-many style sockets this parameter indicates which
3364 * association the user is performing an action upon. Note that if
3365 * this field's value is zero then the endpoints default value is
3366 * changed (effecting future associations only).
3367 * assoc_value: This parameter specifies the maximum size in bytes.
3369 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3371 struct sctp_sock *sp = sctp_sk(sk);
3372 struct sctp_assoc_value params;
3373 struct sctp_association *asoc;
3376 if (optlen == sizeof(int)) {
3377 pr_warn_ratelimited(DEPRECATED
3379 "Use of int in maxseg socket option.\n"
3380 "Use struct sctp_assoc_value instead\n",
3381 current->comm, task_pid_nr(current));
3382 if (copy_from_user(&val, optval, optlen))
3384 params.assoc_id = SCTP_FUTURE_ASSOC;
3385 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3386 if (copy_from_user(¶ms, optval, optlen))
3388 val = params.assoc_value;
3393 asoc = sctp_id2assoc(sk, params.assoc_id);
3394 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3395 sctp_style(sk, UDP))
3399 int min_len, max_len;
3400 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3401 sizeof(struct sctp_data_chunk);
3403 min_len = sctp_min_frag_point(sp, datasize);
3404 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3406 if (val < min_len || val > max_len)
3411 asoc->user_frag = val;
3412 sctp_assoc_update_frag_point(asoc);
3414 sp->user_frag = val;
3422 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3424 * Requests that the peer mark the enclosed address as the association
3425 * primary. The enclosed address must be one of the association's
3426 * locally bound addresses. The following structure is used to make a
3427 * set primary request:
3429 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3430 unsigned int optlen)
3432 struct net *net = sock_net(sk);
3433 struct sctp_sock *sp;
3434 struct sctp_association *asoc = NULL;
3435 struct sctp_setpeerprim prim;
3436 struct sctp_chunk *chunk;
3442 if (!net->sctp.addip_enable)
3445 if (optlen != sizeof(struct sctp_setpeerprim))
3448 if (copy_from_user(&prim, optval, optlen))
3451 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3455 if (!asoc->peer.asconf_capable)
3458 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3461 if (!sctp_state(asoc, ESTABLISHED))
3464 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3468 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3469 return -EADDRNOTAVAIL;
3471 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3472 return -EADDRNOTAVAIL;
3474 /* Allow security module to validate address. */
3475 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3476 (struct sockaddr *)&prim.sspp_addr,
3481 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3482 chunk = sctp_make_asconf_set_prim(asoc,
3483 (union sctp_addr *)&prim.sspp_addr);
3487 err = sctp_send_asconf(asoc, chunk);
3489 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3494 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3495 unsigned int optlen)
3497 struct sctp_setadaptation adaptation;
3499 if (optlen != sizeof(struct sctp_setadaptation))
3501 if (copy_from_user(&adaptation, optval, optlen))
3504 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3510 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3512 * The context field in the sctp_sndrcvinfo structure is normally only
3513 * used when a failed message is retrieved holding the value that was
3514 * sent down on the actual send call. This option allows the setting of
3515 * a default context on an association basis that will be received on
3516 * reading messages from the peer. This is especially helpful in the
3517 * one-2-many model for an application to keep some reference to an
3518 * internal state machine that is processing messages on the
3519 * association. Note that the setting of this value only effects
3520 * received messages from the peer and does not effect the value that is
3521 * saved with outbound messages.
3523 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3524 unsigned int optlen)
3526 struct sctp_sock *sp = sctp_sk(sk);
3527 struct sctp_assoc_value params;
3528 struct sctp_association *asoc;
3530 if (optlen != sizeof(struct sctp_assoc_value))
3532 if (copy_from_user(¶ms, optval, optlen))
3535 asoc = sctp_id2assoc(sk, params.assoc_id);
3536 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3537 sctp_style(sk, UDP))
3541 asoc->default_rcv_context = params.assoc_value;
3546 if (sctp_style(sk, TCP))
3547 params.assoc_id = SCTP_FUTURE_ASSOC;
3549 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3550 params.assoc_id == SCTP_ALL_ASSOC)
3551 sp->default_rcv_context = params.assoc_value;
3553 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3554 params.assoc_id == SCTP_ALL_ASSOC)
3555 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3556 asoc->default_rcv_context = params.assoc_value;
3562 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3564 * This options will at a minimum specify if the implementation is doing
3565 * fragmented interleave. Fragmented interleave, for a one to many
3566 * socket, is when subsequent calls to receive a message may return
3567 * parts of messages from different associations. Some implementations
3568 * may allow you to turn this value on or off. If so, when turned off,
3569 * no fragment interleave will occur (which will cause a head of line
3570 * blocking amongst multiple associations sharing the same one to many
3571 * socket). When this option is turned on, then each receive call may
3572 * come from a different association (thus the user must receive data
3573 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3574 * association each receive belongs to.
3576 * This option takes a boolean value. A non-zero value indicates that
3577 * fragmented interleave is on. A value of zero indicates that
3578 * fragmented interleave is off.
3580 * Note that it is important that an implementation that allows this
3581 * option to be turned on, have it off by default. Otherwise an unaware
3582 * application using the one to many model may become confused and act
3585 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3586 char __user *optval,
3587 unsigned int optlen)
3591 if (optlen != sizeof(int))
3593 if (get_user(val, (int __user *)optval))
3596 sctp_sk(sk)->frag_interleave = !!val;
3598 if (!sctp_sk(sk)->frag_interleave)
3599 sctp_sk(sk)->strm_interleave = 0;
3605 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3606 * (SCTP_PARTIAL_DELIVERY_POINT)
3608 * This option will set or get the SCTP partial delivery point. This
3609 * point is the size of a message where the partial delivery API will be
3610 * invoked to help free up rwnd space for the peer. Setting this to a
3611 * lower value will cause partial deliveries to happen more often. The
3612 * calls argument is an integer that sets or gets the partial delivery
3613 * point. Note also that the call will fail if the user attempts to set
3614 * this value larger than the socket receive buffer size.
3616 * Note that any single message having a length smaller than or equal to
3617 * the SCTP partial delivery point will be delivered in one single read
3618 * call as long as the user provided buffer is large enough to hold the
3621 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3622 char __user *optval,
3623 unsigned int optlen)
3627 if (optlen != sizeof(u32))
3629 if (get_user(val, (int __user *)optval))
3632 /* Note: We double the receive buffer from what the user sets
3633 * it to be, also initial rwnd is based on rcvbuf/2.
3635 if (val > (sk->sk_rcvbuf >> 1))
3638 sctp_sk(sk)->pd_point = val;
3640 return 0; /* is this the right error code? */
3644 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3646 * This option will allow a user to change the maximum burst of packets
3647 * that can be emitted by this association. Note that the default value
3648 * is 4, and some implementations may restrict this setting so that it
3649 * can only be lowered.
3651 * NOTE: This text doesn't seem right. Do this on a socket basis with
3652 * future associations inheriting the socket value.
3654 static int sctp_setsockopt_maxburst(struct sock *sk,
3655 char __user *optval,
3656 unsigned int optlen)
3658 struct sctp_sock *sp = sctp_sk(sk);
3659 struct sctp_assoc_value params;
3660 struct sctp_association *asoc;
3662 if (optlen == sizeof(int)) {
3663 pr_warn_ratelimited(DEPRECATED
3665 "Use of int in max_burst socket option deprecated.\n"
3666 "Use struct sctp_assoc_value instead\n",
3667 current->comm, task_pid_nr(current));
3668 if (copy_from_user(¶ms.assoc_value, optval, optlen))
3670 params.assoc_id = SCTP_FUTURE_ASSOC;
3671 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3672 if (copy_from_user(¶ms, optval, optlen))
3677 asoc = sctp_id2assoc(sk, params.assoc_id);
3678 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3679 sctp_style(sk, UDP))
3683 asoc->max_burst = params.assoc_value;
3688 if (sctp_style(sk, TCP))
3689 params.assoc_id = SCTP_FUTURE_ASSOC;
3691 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3692 params.assoc_id == SCTP_ALL_ASSOC)
3693 sp->max_burst = params.assoc_value;
3695 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3696 params.assoc_id == SCTP_ALL_ASSOC)
3697 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3698 asoc->max_burst = params.assoc_value;
3704 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3706 * This set option adds a chunk type that the user is requesting to be
3707 * received only in an authenticated way. Changes to the list of chunks
3708 * will only effect future associations on the socket.
3710 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3711 char __user *optval,
3712 unsigned int optlen)
3714 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3715 struct sctp_authchunk val;
3717 if (!ep->auth_enable)
3720 if (optlen != sizeof(struct sctp_authchunk))
3722 if (copy_from_user(&val, optval, optlen))
3725 switch (val.sauth_chunk) {
3727 case SCTP_CID_INIT_ACK:
3728 case SCTP_CID_SHUTDOWN_COMPLETE:
3733 /* add this chunk id to the endpoint */
3734 return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3738 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3740 * This option gets or sets the list of HMAC algorithms that the local
3741 * endpoint requires the peer to use.
3743 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3744 char __user *optval,
3745 unsigned int optlen)
3747 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3748 struct sctp_hmacalgo *hmacs;
3752 if (!ep->auth_enable)
3755 if (optlen < sizeof(struct sctp_hmacalgo))
3757 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3758 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3760 hmacs = memdup_user(optval, optlen);
3762 return PTR_ERR(hmacs);
3764 idents = hmacs->shmac_num_idents;
3765 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3766 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3771 err = sctp_auth_ep_set_hmacs(ep, hmacs);
3778 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3780 * This option will set a shared secret key which is used to build an
3781 * association shared key.
3783 static int sctp_setsockopt_auth_key(struct sock *sk,
3784 char __user *optval,
3785 unsigned int optlen)
3787 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3788 struct sctp_authkey *authkey;
3789 struct sctp_association *asoc;
3792 if (!ep->auth_enable)
3795 if (optlen <= sizeof(struct sctp_authkey))
3797 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3800 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3802 authkey = memdup_user(optval, optlen);
3803 if (IS_ERR(authkey))
3804 return PTR_ERR(authkey);
3806 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3809 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3810 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3811 sctp_style(sk, UDP))
3815 ret = sctp_auth_set_key(ep, asoc, authkey);
3819 if (sctp_style(sk, TCP))
3820 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3822 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3823 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3824 ret = sctp_auth_set_key(ep, asoc, authkey);
3831 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3832 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3833 list_for_each_entry(asoc, &ep->asocs, asocs) {
3834 int res = sctp_auth_set_key(ep, asoc, authkey);
3847 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3849 * This option will get or set the active shared key to be used to build
3850 * the association shared key.
3852 static int sctp_setsockopt_active_key(struct sock *sk,
3853 char __user *optval,
3854 unsigned int optlen)
3856 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3857 struct sctp_association *asoc;
3858 struct sctp_authkeyid val;
3861 if (!ep->auth_enable)
3864 if (optlen != sizeof(struct sctp_authkeyid))
3866 if (copy_from_user(&val, optval, optlen))
3869 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3870 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3871 sctp_style(sk, UDP))
3875 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3877 if (sctp_style(sk, TCP))
3878 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3880 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3881 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3882 ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3887 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3888 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3889 list_for_each_entry(asoc, &ep->asocs, asocs) {
3890 int res = sctp_auth_set_active_key(ep, asoc,
3891 val.scact_keynumber);
3902 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3904 * This set option will delete a shared secret key from use.
3906 static int sctp_setsockopt_del_key(struct sock *sk,
3907 char __user *optval,
3908 unsigned int optlen)
3910 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3911 struct sctp_association *asoc;
3912 struct sctp_authkeyid val;
3915 if (!ep->auth_enable)
3918 if (optlen != sizeof(struct sctp_authkeyid))
3920 if (copy_from_user(&val, optval, optlen))
3923 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3924 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3925 sctp_style(sk, UDP))
3929 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3931 if (sctp_style(sk, TCP))
3932 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3934 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3935 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3936 ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3941 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3942 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3943 list_for_each_entry(asoc, &ep->asocs, asocs) {
3944 int res = sctp_auth_del_key_id(ep, asoc,
3945 val.scact_keynumber);
3956 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3958 * This set option will deactivate a shared secret key.
3960 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3961 unsigned int optlen)
3963 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3964 struct sctp_association *asoc;
3965 struct sctp_authkeyid val;
3968 if (!ep->auth_enable)
3971 if (optlen != sizeof(struct sctp_authkeyid))
3973 if (copy_from_user(&val, optval, optlen))
3976 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3977 if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3978 sctp_style(sk, UDP))
3982 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3984 if (sctp_style(sk, TCP))
3985 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3987 if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3988 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3989 ret = sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3994 if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3995 val.scact_assoc_id == SCTP_ALL_ASSOC) {
3996 list_for_each_entry(asoc, &ep->asocs, asocs) {
3997 int res = sctp_auth_deact_key_id(ep, asoc,
3998 val.scact_keynumber);
4009 * 8.1.23 SCTP_AUTO_ASCONF
4011 * This option will enable or disable the use of the automatic generation of
4012 * ASCONF chunks to add and delete addresses to an existing association. Note
4013 * that this option has two caveats namely: a) it only affects sockets that
4014 * are bound to all addresses available to the SCTP stack, and b) the system
4015 * administrator may have an overriding control that turns the ASCONF feature
4016 * off no matter what setting the socket option may have.
4017 * This option expects an integer boolean flag, where a non-zero value turns on
4018 * the option, and a zero value turns off the option.
4019 * Note. In this implementation, socket operation overrides default parameter
4020 * being set by sysctl as well as FreeBSD implementation
4022 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
4023 unsigned int optlen)
4026 struct sctp_sock *sp = sctp_sk(sk);
4028 if (optlen < sizeof(int))
4030 if (get_user(val, (int __user *)optval))
4032 if (!sctp_is_ep_boundall(sk) && val)
4034 if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
4037 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
4038 if (val == 0 && sp->do_auto_asconf) {
4039 list_del(&sp->auto_asconf_list);
4040 sp->do_auto_asconf = 0;
4041 } else if (val && !sp->do_auto_asconf) {
4042 list_add_tail(&sp->auto_asconf_list,
4043 &sock_net(sk)->sctp.auto_asconf_splist);
4044 sp->do_auto_asconf = 1;
4046 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
4051 * SCTP_PEER_ADDR_THLDS
4053 * This option allows us to alter the partially failed threshold for one or all
4054 * transports in an association. See Section 6.1 of:
4055 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
4057 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
4058 char __user *optval,
4059 unsigned int optlen)
4061 struct sctp_paddrthlds val;
4062 struct sctp_transport *trans;
4063 struct sctp_association *asoc;
4065 if (optlen < sizeof(struct sctp_paddrthlds))
4067 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
4068 sizeof(struct sctp_paddrthlds)))
4071 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
4072 trans = sctp_addr_id2transport(sk, &val.spt_address,
4077 if (val.spt_pathmaxrxt)
4078 trans->pathmaxrxt = val.spt_pathmaxrxt;
4079 trans->pf_retrans = val.spt_pathpfthld;
4084 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
4085 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
4086 sctp_style(sk, UDP))
4090 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
4092 if (val.spt_pathmaxrxt)
4093 trans->pathmaxrxt = val.spt_pathmaxrxt;
4094 trans->pf_retrans = val.spt_pathpfthld;
4097 if (val.spt_pathmaxrxt)
4098 asoc->pathmaxrxt = val.spt_pathmaxrxt;
4099 asoc->pf_retrans = val.spt_pathpfthld;
4101 struct sctp_sock *sp = sctp_sk(sk);
4103 if (val.spt_pathmaxrxt)
4104 sp->pathmaxrxt = val.spt_pathmaxrxt;
4105 sp->pf_retrans = val.spt_pathpfthld;
4111 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
4112 char __user *optval,
4113 unsigned int optlen)
4117 if (optlen < sizeof(int))
4119 if (get_user(val, (int __user *) optval))
4122 sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4127 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4128 char __user *optval,
4129 unsigned int optlen)
4133 if (optlen < sizeof(int))
4135 if (get_user(val, (int __user *) optval))
4138 sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4143 static int sctp_setsockopt_pr_supported(struct sock *sk,
4144 char __user *optval,
4145 unsigned int optlen)
4147 struct sctp_assoc_value params;
4148 struct sctp_association *asoc;
4150 if (optlen != sizeof(params))
4153 if (copy_from_user(¶ms, optval, optlen))
4156 asoc = sctp_id2assoc(sk, params.assoc_id);
4157 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4158 sctp_style(sk, UDP))
4161 sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4166 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4167 char __user *optval,
4168 unsigned int optlen)
4170 struct sctp_sock *sp = sctp_sk(sk);
4171 struct sctp_default_prinfo info;
4172 struct sctp_association *asoc;
4173 int retval = -EINVAL;
4175 if (optlen != sizeof(info))
4178 if (copy_from_user(&info, optval, sizeof(info))) {
4183 if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4186 if (info.pr_policy == SCTP_PR_SCTP_NONE)
4189 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4190 if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4191 sctp_style(sk, UDP))
4197 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4198 asoc->default_timetolive = info.pr_value;
4202 if (sctp_style(sk, TCP))
4203 info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4205 if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4206 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4207 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4208 sp->default_timetolive = info.pr_value;
4211 if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4212 info.pr_assoc_id == SCTP_ALL_ASSOC) {
4213 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4214 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4215 asoc->default_timetolive = info.pr_value;
4223 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4224 char __user *optval,
4225 unsigned int optlen)
4227 struct sctp_assoc_value params;
4228 struct sctp_association *asoc;
4229 int retval = -EINVAL;
4231 if (optlen != sizeof(params))
4234 if (copy_from_user(¶ms, optval, optlen)) {
4239 asoc = sctp_id2assoc(sk, params.assoc_id);
4240 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4241 sctp_style(sk, UDP))
4245 asoc->reconf_enable = !!params.assoc_value;
4247 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4255 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4256 char __user *optval,
4257 unsigned int optlen)
4259 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4260 struct sctp_assoc_value params;
4261 struct sctp_association *asoc;
4262 int retval = -EINVAL;
4264 if (optlen != sizeof(params))
4267 if (copy_from_user(¶ms, optval, optlen)) {
4272 if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4275 asoc = sctp_id2assoc(sk, params.assoc_id);
4276 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4277 sctp_style(sk, UDP))
4283 asoc->strreset_enable = params.assoc_value;
4287 if (sctp_style(sk, TCP))
4288 params.assoc_id = SCTP_FUTURE_ASSOC;
4290 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4291 params.assoc_id == SCTP_ALL_ASSOC)
4292 ep->strreset_enable = params.assoc_value;
4294 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4295 params.assoc_id == SCTP_ALL_ASSOC)
4296 list_for_each_entry(asoc, &ep->asocs, asocs)
4297 asoc->strreset_enable = params.assoc_value;
4303 static int sctp_setsockopt_reset_streams(struct sock *sk,
4304 char __user *optval,
4305 unsigned int optlen)
4307 struct sctp_reset_streams *params;
4308 struct sctp_association *asoc;
4309 int retval = -EINVAL;
4311 if (optlen < sizeof(*params))
4313 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4314 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4315 sizeof(__u16) * sizeof(*params));
4317 params = memdup_user(optval, optlen);
4319 return PTR_ERR(params);
4321 if (params->srs_number_streams * sizeof(__u16) >
4322 optlen - sizeof(*params))
4325 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4329 retval = sctp_send_reset_streams(asoc, params);
4336 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4337 char __user *optval,
4338 unsigned int optlen)
4340 struct sctp_association *asoc;
4341 sctp_assoc_t associd;
4342 int retval = -EINVAL;
4344 if (optlen != sizeof(associd))
4347 if (copy_from_user(&associd, optval, optlen)) {
4352 asoc = sctp_id2assoc(sk, associd);
4356 retval = sctp_send_reset_assoc(asoc);
4362 static int sctp_setsockopt_add_streams(struct sock *sk,
4363 char __user *optval,
4364 unsigned int optlen)
4366 struct sctp_association *asoc;
4367 struct sctp_add_streams params;
4368 int retval = -EINVAL;
4370 if (optlen != sizeof(params))
4373 if (copy_from_user(¶ms, optval, optlen)) {
4378 asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4382 retval = sctp_send_add_streams(asoc, ¶ms);
4388 static int sctp_setsockopt_scheduler(struct sock *sk,
4389 char __user *optval,
4390 unsigned int optlen)
4392 struct sctp_sock *sp = sctp_sk(sk);
4393 struct sctp_association *asoc;
4394 struct sctp_assoc_value params;
4397 if (optlen < sizeof(params))
4400 optlen = sizeof(params);
4401 if (copy_from_user(¶ms, optval, optlen))
4404 if (params.assoc_value > SCTP_SS_MAX)
4407 asoc = sctp_id2assoc(sk, params.assoc_id);
4408 if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4409 sctp_style(sk, UDP))
4413 return sctp_sched_set_sched(asoc, params.assoc_value);
4415 if (sctp_style(sk, TCP))
4416 params.assoc_id = SCTP_FUTURE_ASSOC;
4418 if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4419 params.assoc_id == SCTP_ALL_ASSOC)
4420 sp->default_ss = params.assoc_value;
4422 if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4423 params.assoc_id == SCTP_ALL_ASSOC) {
4424 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4425 int ret = sctp_sched_set_sched(asoc,
4426 params.assoc_value);
4436 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4437 char __user *optval,
4438 unsigned int optlen)
4440 struct sctp_stream_value params;
4441 struct sctp_association *asoc;
4442 int retval = -EINVAL;
4444 if (optlen < sizeof(params))
4447 optlen = sizeof(params);
4448 if (copy_from_user(¶ms, optval, optlen)) {
4453 asoc = sctp_id2assoc(sk, params.assoc_id);
4454 if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4455 sctp_style(sk, UDP))
4459 retval = sctp_sched_set_value(asoc, params.stream_id,
4460 params.stream_value, GFP_KERNEL);
4466 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4467 int ret = sctp_sched_set_value(asoc, params.stream_id,
4468 params.stream_value, GFP_KERNEL);
4469 if (ret && !retval) /* try to return the 1st error. */
4477 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4478 char __user *optval,
4479 unsigned int optlen)
4481 struct sctp_sock *sp = sctp_sk(sk);
4482 struct sctp_assoc_value params;
4483 struct sctp_association *asoc;
4484 int retval = -EINVAL;
4486 if (optlen < sizeof(params))
4489 optlen = sizeof(params);
4490 if (copy_from_user(¶ms, optval, optlen)) {
4495 asoc = sctp_id2assoc(sk, params.assoc_id);
4496 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4497 sctp_style(sk, UDP))
4500 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4505 sp->strm_interleave = !!params.assoc_value;
4513 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4514 unsigned int optlen)
4518 if (!sctp_style(sk, TCP))
4521 if (sctp_sk(sk)->ep->base.bind_addr.port)
4524 if (optlen < sizeof(int))
4527 if (get_user(val, (int __user *)optval))
4530 sctp_sk(sk)->reuse = !!val;
4535 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4536 struct sctp_association *asoc)
4538 struct sctp_ulpevent *event;
4540 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4542 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4543 if (sctp_outq_is_empty(&asoc->outqueue)) {
4544 event = sctp_ulpevent_make_sender_dry_event(asoc,
4545 GFP_USER | __GFP_NOWARN);
4549 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4556 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4557 unsigned int optlen)
4559 struct sctp_sock *sp = sctp_sk(sk);
4560 struct sctp_association *asoc;
4561 struct sctp_event param;
4564 if (optlen < sizeof(param))
4567 optlen = sizeof(param);
4568 if (copy_from_user(¶m, optval, optlen))
4571 if (param.se_type < SCTP_SN_TYPE_BASE ||
4572 param.se_type > SCTP_SN_TYPE_MAX)
4575 asoc = sctp_id2assoc(sk, param.se_assoc_id);
4576 if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4577 sctp_style(sk, UDP))
4581 return sctp_assoc_ulpevent_type_set(¶m, asoc);
4583 if (sctp_style(sk, TCP))
4584 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4586 if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4587 param.se_assoc_id == SCTP_ALL_ASSOC)
4588 sctp_ulpevent_type_set(&sp->subscribe,
4589 param.se_type, param.se_on);
4591 if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4592 param.se_assoc_id == SCTP_ALL_ASSOC) {
4593 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4594 int ret = sctp_assoc_ulpevent_type_set(¶m, asoc);
4604 /* API 6.2 setsockopt(), getsockopt()
4606 * Applications use setsockopt() and getsockopt() to set or retrieve
4607 * socket options. Socket options are used to change the default
4608 * behavior of sockets calls. They are described in Section 7.
4612 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4613 * int __user *optlen);
4614 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4617 * sd - the socket descript.
4618 * level - set to IPPROTO_SCTP for all SCTP options.
4619 * optname - the option name.
4620 * optval - the buffer to store the value of the option.
4621 * optlen - the size of the buffer.
4623 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4624 char __user *optval, unsigned int optlen)
4628 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4630 /* I can hardly begin to describe how wrong this is. This is
4631 * so broken as to be worse than useless. The API draft
4632 * REALLY is NOT helpful here... I am not convinced that the
4633 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4634 * are at all well-founded.
4636 if (level != SOL_SCTP) {
4637 struct sctp_af *af = sctp_sk(sk)->pf->af;
4638 retval = af->setsockopt(sk, level, optname, optval, optlen);
4645 case SCTP_SOCKOPT_BINDX_ADD:
4646 /* 'optlen' is the size of the addresses buffer. */
4647 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4648 optlen, SCTP_BINDX_ADD_ADDR);
4651 case SCTP_SOCKOPT_BINDX_REM:
4652 /* 'optlen' is the size of the addresses buffer. */
4653 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4654 optlen, SCTP_BINDX_REM_ADDR);
4657 case SCTP_SOCKOPT_CONNECTX_OLD:
4658 /* 'optlen' is the size of the addresses buffer. */
4659 retval = sctp_setsockopt_connectx_old(sk,
4660 (struct sockaddr __user *)optval,
4664 case SCTP_SOCKOPT_CONNECTX:
4665 /* 'optlen' is the size of the addresses buffer. */
4666 retval = sctp_setsockopt_connectx(sk,
4667 (struct sockaddr __user *)optval,
4671 case SCTP_DISABLE_FRAGMENTS:
4672 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4676 retval = sctp_setsockopt_events(sk, optval, optlen);
4679 case SCTP_AUTOCLOSE:
4680 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4683 case SCTP_PEER_ADDR_PARAMS:
4684 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4687 case SCTP_DELAYED_SACK:
4688 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4690 case SCTP_PARTIAL_DELIVERY_POINT:
4691 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4695 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4697 case SCTP_DEFAULT_SEND_PARAM:
4698 retval = sctp_setsockopt_default_send_param(sk, optval,
4701 case SCTP_DEFAULT_SNDINFO:
4702 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4704 case SCTP_PRIMARY_ADDR:
4705 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4707 case SCTP_SET_PEER_PRIMARY_ADDR:
4708 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4711 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4714 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4716 case SCTP_ASSOCINFO:
4717 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4719 case SCTP_I_WANT_MAPPED_V4_ADDR:
4720 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4723 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4725 case SCTP_ADAPTATION_LAYER:
4726 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4729 retval = sctp_setsockopt_context(sk, optval, optlen);
4731 case SCTP_FRAGMENT_INTERLEAVE:
4732 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4734 case SCTP_MAX_BURST:
4735 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4737 case SCTP_AUTH_CHUNK:
4738 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4740 case SCTP_HMAC_IDENT:
4741 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4744 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4746 case SCTP_AUTH_ACTIVE_KEY:
4747 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4749 case SCTP_AUTH_DELETE_KEY:
4750 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4752 case SCTP_AUTH_DEACTIVATE_KEY:
4753 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4755 case SCTP_AUTO_ASCONF:
4756 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4758 case SCTP_PEER_ADDR_THLDS:
4759 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4761 case SCTP_RECVRCVINFO:
4762 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4764 case SCTP_RECVNXTINFO:
4765 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4767 case SCTP_PR_SUPPORTED:
4768 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4770 case SCTP_DEFAULT_PRINFO:
4771 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4773 case SCTP_RECONFIG_SUPPORTED:
4774 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4776 case SCTP_ENABLE_STREAM_RESET:
4777 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4779 case SCTP_RESET_STREAMS:
4780 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4782 case SCTP_RESET_ASSOC:
4783 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4785 case SCTP_ADD_STREAMS:
4786 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4788 case SCTP_STREAM_SCHEDULER:
4789 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4791 case SCTP_STREAM_SCHEDULER_VALUE:
4792 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4794 case SCTP_INTERLEAVING_SUPPORTED:
4795 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4798 case SCTP_REUSE_PORT:
4799 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4802 retval = sctp_setsockopt_event(sk, optval, optlen);
4805 retval = -ENOPROTOOPT;
4815 /* API 3.1.6 connect() - UDP Style Syntax
4817 * An application may use the connect() call in the UDP model to initiate an
4818 * association without sending data.
4822 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4824 * sd: the socket descriptor to have a new association added to.
4826 * nam: the address structure (either struct sockaddr_in or struct
4827 * sockaddr_in6 defined in RFC2553 [7]).
4829 * len: the size of the address.
4831 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4832 int addr_len, int flags)
4834 struct inet_sock *inet = inet_sk(sk);
4840 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4843 /* We may need to bind the socket. */
4844 if (!inet->inet_num) {
4845 if (sk->sk_prot->get_port(sk, 0)) {
4849 inet->inet_sport = htons(inet->inet_num);
4852 /* Validate addr_len before calling common connect/connectx routine. */
4853 af = addr_len < offsetofend(struct sockaddr, sa_family) ? NULL :
4854 sctp_get_af_specific(addr->sa_family);
4855 if (!af || addr_len < af->sockaddr_len) {
4858 /* Pass correct addr len to common routine (so it knows there
4859 * is only one address being passed.
4861 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4868 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4869 int addr_len, int flags)
4871 if (addr_len < sizeof(uaddr->sa_family))
4874 if (uaddr->sa_family == AF_UNSPEC)
4877 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4880 /* FIXME: Write comments. */
4881 static int sctp_disconnect(struct sock *sk, int flags)
4883 return -EOPNOTSUPP; /* STUB */
4886 /* 4.1.4 accept() - TCP Style Syntax
4888 * Applications use accept() call to remove an established SCTP
4889 * association from the accept queue of the endpoint. A new socket
4890 * descriptor will be returned from accept() to represent the newly
4891 * formed association.
4893 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4895 struct sctp_sock *sp;
4896 struct sctp_endpoint *ep;
4897 struct sock *newsk = NULL;
4898 struct sctp_association *asoc;
4907 if (!sctp_style(sk, TCP)) {
4908 error = -EOPNOTSUPP;
4912 if (!sctp_sstate(sk, LISTENING)) {
4917 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4919 error = sctp_wait_for_accept(sk, timeo);
4923 /* We treat the list of associations on the endpoint as the accept
4924 * queue and pick the first association on the list.
4926 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4928 newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4934 /* Populate the fields of the newsk from the oldsk and migrate the
4935 * asoc to the newsk.
4937 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4939 sk_common_release(newsk);
4949 /* The SCTP ioctl handler. */
4950 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4957 * SEQPACKET-style sockets in LISTENING state are valid, for
4958 * SCTP, so only discard TCP-style sockets in LISTENING state.
4960 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4965 struct sk_buff *skb;
4966 unsigned int amount = 0;
4968 skb = skb_peek(&sk->sk_receive_queue);
4971 * We will only return the amount of this packet since
4972 * that is all that will be read.
4976 rc = put_user(amount, (int __user *)arg);
4988 /* This is the function which gets called during socket creation to
4989 * initialized the SCTP-specific portion of the sock.
4990 * The sock structure should already be zero-filled memory.
4992 static int sctp_init_sock(struct sock *sk)
4994 struct net *net = sock_net(sk);
4995 struct sctp_sock *sp;
4997 pr_debug("%s: sk:%p\n", __func__, sk);
5001 /* Initialize the SCTP per socket area. */
5002 switch (sk->sk_type) {
5003 case SOCK_SEQPACKET:
5004 sp->type = SCTP_SOCKET_UDP;
5007 sp->type = SCTP_SOCKET_TCP;
5010 return -ESOCKTNOSUPPORT;
5013 sk->sk_gso_type = SKB_GSO_SCTP;
5015 /* Initialize default send parameters. These parameters can be
5016 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
5018 sp->default_stream = 0;
5019 sp->default_ppid = 0;
5020 sp->default_flags = 0;
5021 sp->default_context = 0;
5022 sp->default_timetolive = 0;
5024 sp->default_rcv_context = 0;
5025 sp->max_burst = net->sctp.max_burst;
5027 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5029 /* Initialize default setup parameters. These parameters
5030 * can be modified with the SCTP_INITMSG socket option or
5031 * overridden by the SCTP_INIT CMSG.
5033 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
5034 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
5035 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
5036 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5038 /* Initialize default RTO related parameters. These parameters can
5039 * be modified for with the SCTP_RTOINFO socket option.
5041 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5042 sp->rtoinfo.srto_max = net->sctp.rto_max;
5043 sp->rtoinfo.srto_min = net->sctp.rto_min;
5045 /* Initialize default association related parameters. These parameters
5046 * can be modified with the SCTP_ASSOCINFO socket option.
5048 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5049 sp->assocparams.sasoc_number_peer_destinations = 0;
5050 sp->assocparams.sasoc_peer_rwnd = 0;
5051 sp->assocparams.sasoc_local_rwnd = 0;
5052 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5054 /* Initialize default event subscriptions. By default, all the
5059 /* Default Peer Address Parameters. These defaults can
5060 * be modified via SCTP_PEER_ADDR_PARAMS
5062 sp->hbinterval = net->sctp.hb_interval;
5063 sp->pathmaxrxt = net->sctp.max_retrans_path;
5064 sp->pf_retrans = net->sctp.pf_retrans;
5065 sp->pathmtu = 0; /* allow default discovery */
5066 sp->sackdelay = net->sctp.sack_timeout;
5068 sp->param_flags = SPP_HB_ENABLE |
5070 SPP_SACKDELAY_ENABLE;
5071 sp->default_ss = SCTP_SS_DEFAULT;
5073 /* If enabled no SCTP message fragmentation will be performed.
5074 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5076 sp->disable_fragments = 0;
5078 /* Enable Nagle algorithm by default. */
5081 sp->recvrcvinfo = 0;
5082 sp->recvnxtinfo = 0;
5084 /* Enable by default. */
5087 /* Auto-close idle associations after the configured
5088 * number of seconds. A value of 0 disables this
5089 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5090 * for UDP-style sockets only.
5094 /* User specified fragmentation limit. */
5097 sp->adaptation_ind = 0;
5099 sp->pf = sctp_get_pf_specific(sk->sk_family);
5101 /* Control variables for partial data delivery. */
5102 atomic_set(&sp->pd_mode, 0);
5103 skb_queue_head_init(&sp->pd_lobby);
5104 sp->frag_interleave = 0;
5106 /* Create a per socket endpoint structure. Even if we
5107 * change the data structure relationships, this may still
5108 * be useful for storing pre-connect address information.
5110 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5116 sk->sk_destruct = sctp_destruct_sock;
5118 SCTP_DBG_OBJCNT_INC(sock);
5121 sk_sockets_allocated_inc(sk);
5122 sock_prot_inuse_add(net, sk->sk_prot, 1);
5124 /* Nothing can fail after this block, otherwise
5125 * sctp_destroy_sock() will be called without addr_wq_lock held
5127 if (net->sctp.default_auto_asconf) {
5128 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5129 list_add_tail(&sp->auto_asconf_list,
5130 &net->sctp.auto_asconf_splist);
5131 sp->do_auto_asconf = 1;
5132 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5134 sp->do_auto_asconf = 0;
5142 /* Cleanup any SCTP per socket resources. Must be called with
5143 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5145 static void sctp_destroy_sock(struct sock *sk)
5147 struct sctp_sock *sp;
5149 pr_debug("%s: sk:%p\n", __func__, sk);
5151 /* Release our hold on the endpoint. */
5153 /* This could happen during socket init, thus we bail out
5154 * early, since the rest of the below is not setup either.
5159 if (sp->do_auto_asconf) {
5160 sp->do_auto_asconf = 0;
5161 list_del(&sp->auto_asconf_list);
5163 sctp_endpoint_free(sp->ep);
5165 sk_sockets_allocated_dec(sk);
5166 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5170 /* Triggered when there are no references on the socket anymore */
5171 static void sctp_destruct_sock(struct sock *sk)
5173 struct sctp_sock *sp = sctp_sk(sk);
5175 /* Free up the HMAC transform. */
5176 crypto_free_shash(sp->hmac);
5178 inet_sock_destruct(sk);
5181 /* API 4.1.7 shutdown() - TCP Style Syntax
5182 * int shutdown(int socket, int how);
5184 * sd - the socket descriptor of the association to be closed.
5185 * how - Specifies the type of shutdown. The values are
5188 * Disables further receive operations. No SCTP
5189 * protocol action is taken.
5191 * Disables further send operations, and initiates
5192 * the SCTP shutdown sequence.
5194 * Disables further send and receive operations
5195 * and initiates the SCTP shutdown sequence.
5197 static void sctp_shutdown(struct sock *sk, int how)
5199 struct net *net = sock_net(sk);
5200 struct sctp_endpoint *ep;
5202 if (!sctp_style(sk, TCP))
5205 ep = sctp_sk(sk)->ep;
5206 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5207 struct sctp_association *asoc;
5209 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5210 asoc = list_entry(ep->asocs.next,
5211 struct sctp_association, asocs);
5212 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5216 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5217 struct sctp_info *info)
5219 struct sctp_transport *prim;
5220 struct list_head *pos;
5223 memset(info, 0, sizeof(*info));
5225 struct sctp_sock *sp = sctp_sk(sk);
5227 info->sctpi_s_autoclose = sp->autoclose;
5228 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5229 info->sctpi_s_pd_point = sp->pd_point;
5230 info->sctpi_s_nodelay = sp->nodelay;
5231 info->sctpi_s_disable_fragments = sp->disable_fragments;
5232 info->sctpi_s_v4mapped = sp->v4mapped;
5233 info->sctpi_s_frag_interleave = sp->frag_interleave;
5234 info->sctpi_s_type = sp->type;
5239 info->sctpi_tag = asoc->c.my_vtag;
5240 info->sctpi_state = asoc->state;
5241 info->sctpi_rwnd = asoc->a_rwnd;
5242 info->sctpi_unackdata = asoc->unack_data;
5243 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5244 info->sctpi_instrms = asoc->stream.incnt;
5245 info->sctpi_outstrms = asoc->stream.outcnt;
5246 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5247 info->sctpi_inqueue++;
5248 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5249 info->sctpi_outqueue++;
5250 info->sctpi_overall_error = asoc->overall_error_count;
5251 info->sctpi_max_burst = asoc->max_burst;
5252 info->sctpi_maxseg = asoc->frag_point;
5253 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5254 info->sctpi_peer_tag = asoc->c.peer_vtag;
5256 mask = asoc->peer.ecn_capable << 1;
5257 mask = (mask | asoc->peer.ipv4_address) << 1;
5258 mask = (mask | asoc->peer.ipv6_address) << 1;
5259 mask = (mask | asoc->peer.hostname_address) << 1;
5260 mask = (mask | asoc->peer.asconf_capable) << 1;
5261 mask = (mask | asoc->peer.prsctp_capable) << 1;
5262 mask = (mask | asoc->peer.auth_capable);
5263 info->sctpi_peer_capable = mask;
5264 mask = asoc->peer.sack_needed << 1;
5265 mask = (mask | asoc->peer.sack_generation) << 1;
5266 mask = (mask | asoc->peer.zero_window_announced);
5267 info->sctpi_peer_sack = mask;
5269 info->sctpi_isacks = asoc->stats.isacks;
5270 info->sctpi_osacks = asoc->stats.osacks;
5271 info->sctpi_opackets = asoc->stats.opackets;
5272 info->sctpi_ipackets = asoc->stats.ipackets;
5273 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5274 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5275 info->sctpi_idupchunks = asoc->stats.idupchunks;
5276 info->sctpi_gapcnt = asoc->stats.gapcnt;
5277 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5278 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5279 info->sctpi_oodchunks = asoc->stats.oodchunks;
5280 info->sctpi_iodchunks = asoc->stats.iodchunks;
5281 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5282 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5284 prim = asoc->peer.primary_path;
5285 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5286 info->sctpi_p_state = prim->state;
5287 info->sctpi_p_cwnd = prim->cwnd;
5288 info->sctpi_p_srtt = prim->srtt;
5289 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5290 info->sctpi_p_hbinterval = prim->hbinterval;
5291 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5292 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5293 info->sctpi_p_ssthresh = prim->ssthresh;
5294 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5295 info->sctpi_p_flight_size = prim->flight_size;
5296 info->sctpi_p_error = prim->error_count;
5300 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5302 /* use callback to avoid exporting the core structure */
5303 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5305 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5307 rhashtable_walk_start(iter);
5310 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5312 rhashtable_walk_stop(iter);
5313 rhashtable_walk_exit(iter);
5316 struct sctp_transport *sctp_transport_get_next(struct net *net,
5317 struct rhashtable_iter *iter)
5319 struct sctp_transport *t;
5321 t = rhashtable_walk_next(iter);
5322 for (; t; t = rhashtable_walk_next(iter)) {
5324 if (PTR_ERR(t) == -EAGAIN)
5329 if (!sctp_transport_hold(t))
5332 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5333 t->asoc->peer.primary_path == t)
5336 sctp_transport_put(t);
5342 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5343 struct rhashtable_iter *iter,
5346 struct sctp_transport *t;
5349 return SEQ_START_TOKEN;
5351 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5354 sctp_transport_put(t);
5360 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5364 struct sctp_ep_common *epb;
5365 struct sctp_hashbucket *head;
5367 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5369 read_lock_bh(&head->lock);
5370 sctp_for_each_hentry(epb, &head->chain) {
5371 err = cb(sctp_ep(epb), p);
5375 read_unlock_bh(&head->lock);
5380 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5382 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5384 const union sctp_addr *laddr,
5385 const union sctp_addr *paddr, void *p)
5387 struct sctp_transport *transport;
5391 transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5396 err = cb(transport, p);
5397 sctp_transport_put(transport);
5401 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5403 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5404 int (*cb_done)(struct sctp_transport *, void *),
5405 struct net *net, int *pos, void *p) {
5406 struct rhashtable_iter hti;
5407 struct sctp_transport *tsp;
5412 sctp_transport_walk_start(&hti);
5414 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5415 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5420 sctp_transport_put(tsp);
5422 sctp_transport_walk_stop(&hti);
5425 if (cb_done && !cb_done(tsp, p)) {
5427 sctp_transport_put(tsp);
5430 sctp_transport_put(tsp);
5435 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5437 /* 7.2.1 Association Status (SCTP_STATUS)
5439 * Applications can retrieve current status information about an
5440 * association, including association state, peer receiver window size,
5441 * number of unacked data chunks, and number of data chunks pending
5442 * receipt. This information is read-only.
5444 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5445 char __user *optval,
5448 struct sctp_status status;
5449 struct sctp_association *asoc = NULL;
5450 struct sctp_transport *transport;
5451 sctp_assoc_t associd;
5454 if (len < sizeof(status)) {
5459 len = sizeof(status);
5460 if (copy_from_user(&status, optval, len)) {
5465 associd = status.sstat_assoc_id;
5466 asoc = sctp_id2assoc(sk, associd);
5472 transport = asoc->peer.primary_path;
5474 status.sstat_assoc_id = sctp_assoc2id(asoc);
5475 status.sstat_state = sctp_assoc_to_state(asoc);
5476 status.sstat_rwnd = asoc->peer.rwnd;
5477 status.sstat_unackdata = asoc->unack_data;
5479 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5480 status.sstat_instrms = asoc->stream.incnt;
5481 status.sstat_outstrms = asoc->stream.outcnt;
5482 status.sstat_fragmentation_point = asoc->frag_point;
5483 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5484 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5485 transport->af_specific->sockaddr_len);
5486 /* Map ipv4 address into v4-mapped-on-v6 address. */
5487 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5488 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5489 status.sstat_primary.spinfo_state = transport->state;
5490 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5491 status.sstat_primary.spinfo_srtt = transport->srtt;
5492 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5493 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5495 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5496 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5498 if (put_user(len, optlen)) {
5503 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5504 __func__, len, status.sstat_state, status.sstat_rwnd,
5505 status.sstat_assoc_id);
5507 if (copy_to_user(optval, &status, len)) {
5517 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5519 * Applications can retrieve information about a specific peer address
5520 * of an association, including its reachability state, congestion
5521 * window, and retransmission timer values. This information is
5524 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5525 char __user *optval,
5528 struct sctp_paddrinfo pinfo;
5529 struct sctp_transport *transport;
5532 if (len < sizeof(pinfo)) {
5537 len = sizeof(pinfo);
5538 if (copy_from_user(&pinfo, optval, len)) {
5543 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5544 pinfo.spinfo_assoc_id);
5548 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5549 pinfo.spinfo_state = transport->state;
5550 pinfo.spinfo_cwnd = transport->cwnd;
5551 pinfo.spinfo_srtt = transport->srtt;
5552 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5553 pinfo.spinfo_mtu = transport->pathmtu;
5555 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5556 pinfo.spinfo_state = SCTP_ACTIVE;
5558 if (put_user(len, optlen)) {
5563 if (copy_to_user(optval, &pinfo, len)) {
5572 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5574 * This option is a on/off flag. If enabled no SCTP message
5575 * fragmentation will be performed. Instead if a message being sent
5576 * exceeds the current PMTU size, the message will NOT be sent and
5577 * instead a error will be indicated to the user.
5579 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5580 char __user *optval, int __user *optlen)
5584 if (len < sizeof(int))
5588 val = (sctp_sk(sk)->disable_fragments == 1);
5589 if (put_user(len, optlen))
5591 if (copy_to_user(optval, &val, len))
5596 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5598 * This socket option is used to specify various notifications and
5599 * ancillary data the user wishes to receive.
5601 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5604 struct sctp_event_subscribe subscribe;
5605 __u8 *sn_type = (__u8 *)&subscribe;
5610 if (len > sizeof(struct sctp_event_subscribe))
5611 len = sizeof(struct sctp_event_subscribe);
5612 if (put_user(len, optlen))
5615 for (i = 0; i < len; i++)
5616 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5617 SCTP_SN_TYPE_BASE + i);
5619 if (copy_to_user(optval, &subscribe, len))
5625 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5627 * This socket option is applicable to the UDP-style socket only. When
5628 * set it will cause associations that are idle for more than the
5629 * specified number of seconds to automatically close. An association
5630 * being idle is defined an association that has NOT sent or received
5631 * user data. The special value of '0' indicates that no automatic
5632 * close of any associations should be performed. The option expects an
5633 * integer defining the number of seconds of idle time before an
5634 * association is closed.
5636 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5638 /* Applicable to UDP-style socket only */
5639 if (sctp_style(sk, TCP))
5641 if (len < sizeof(int))
5644 if (put_user(len, optlen))
5646 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5651 /* Helper routine to branch off an association to a new socket. */
5652 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5654 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5655 struct sctp_sock *sp = sctp_sk(sk);
5656 struct socket *sock;
5659 /* Do not peel off from one netns to another one. */
5660 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5666 /* An association cannot be branched off from an already peeled-off
5667 * socket, nor is this supported for tcp style sockets.
5669 if (!sctp_style(sk, UDP))
5672 /* Create a new socket. */
5673 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5677 sctp_copy_sock(sock->sk, sk, asoc);
5679 /* Make peeled-off sockets more like 1-1 accepted sockets.
5680 * Set the daddr and initialize id to something more random and also
5681 * copy over any ip options.
5683 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5684 sp->pf->copy_ip_options(sk, sock->sk);
5686 /* Populate the fields of the newsk from the oldsk and migrate the
5687 * asoc to the newsk.
5689 err = sctp_sock_migrate(sk, sock->sk, asoc,
5690 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5700 EXPORT_SYMBOL(sctp_do_peeloff);
5702 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5703 struct file **newfile, unsigned flags)
5705 struct socket *newsock;
5708 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5712 /* Map the socket to an unused fd that can be returned to the user. */
5713 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5715 sock_release(newsock);
5719 *newfile = sock_alloc_file(newsock, 0, NULL);
5720 if (IS_ERR(*newfile)) {
5721 put_unused_fd(retval);
5722 retval = PTR_ERR(*newfile);
5727 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5730 peeloff->sd = retval;
5732 if (flags & SOCK_NONBLOCK)
5733 (*newfile)->f_flags |= O_NONBLOCK;
5738 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5740 sctp_peeloff_arg_t peeloff;
5741 struct file *newfile = NULL;
5744 if (len < sizeof(sctp_peeloff_arg_t))
5746 len = sizeof(sctp_peeloff_arg_t);
5747 if (copy_from_user(&peeloff, optval, len))
5750 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5754 /* Return the fd mapped to the new socket. */
5755 if (put_user(len, optlen)) {
5757 put_unused_fd(retval);
5761 if (copy_to_user(optval, &peeloff, len)) {
5763 put_unused_fd(retval);
5766 fd_install(retval, newfile);
5771 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5772 char __user *optval, int __user *optlen)
5774 sctp_peeloff_flags_arg_t peeloff;
5775 struct file *newfile = NULL;
5778 if (len < sizeof(sctp_peeloff_flags_arg_t))
5780 len = sizeof(sctp_peeloff_flags_arg_t);
5781 if (copy_from_user(&peeloff, optval, len))
5784 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5785 &newfile, peeloff.flags);
5789 /* Return the fd mapped to the new socket. */
5790 if (put_user(len, optlen)) {
5792 put_unused_fd(retval);
5796 if (copy_to_user(optval, &peeloff, len)) {
5798 put_unused_fd(retval);
5801 fd_install(retval, newfile);
5806 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5808 * Applications can enable or disable heartbeats for any peer address of
5809 * an association, modify an address's heartbeat interval, force a
5810 * heartbeat to be sent immediately, and adjust the address's maximum
5811 * number of retransmissions sent before an address is considered
5812 * unreachable. The following structure is used to access and modify an
5813 * address's parameters:
5815 * struct sctp_paddrparams {
5816 * sctp_assoc_t spp_assoc_id;
5817 * struct sockaddr_storage spp_address;
5818 * uint32_t spp_hbinterval;
5819 * uint16_t spp_pathmaxrxt;
5820 * uint32_t spp_pathmtu;
5821 * uint32_t spp_sackdelay;
5822 * uint32_t spp_flags;
5825 * spp_assoc_id - (one-to-many style socket) This is filled in the
5826 * application, and identifies the association for
5828 * spp_address - This specifies which address is of interest.
5829 * spp_hbinterval - This contains the value of the heartbeat interval,
5830 * in milliseconds. If a value of zero
5831 * is present in this field then no changes are to
5832 * be made to this parameter.
5833 * spp_pathmaxrxt - This contains the maximum number of
5834 * retransmissions before this address shall be
5835 * considered unreachable. If a value of zero
5836 * is present in this field then no changes are to
5837 * be made to this parameter.
5838 * spp_pathmtu - When Path MTU discovery is disabled the value
5839 * specified here will be the "fixed" path mtu.
5840 * Note that if the spp_address field is empty
5841 * then all associations on this address will
5842 * have this fixed path mtu set upon them.
5844 * spp_sackdelay - When delayed sack is enabled, this value specifies
5845 * the number of milliseconds that sacks will be delayed
5846 * for. This value will apply to all addresses of an
5847 * association if the spp_address field is empty. Note
5848 * also, that if delayed sack is enabled and this
5849 * value is set to 0, no change is made to the last
5850 * recorded delayed sack timer value.
5852 * spp_flags - These flags are used to control various features
5853 * on an association. The flag field may contain
5854 * zero or more of the following options.
5856 * SPP_HB_ENABLE - Enable heartbeats on the
5857 * specified address. Note that if the address
5858 * field is empty all addresses for the association
5859 * have heartbeats enabled upon them.
5861 * SPP_HB_DISABLE - Disable heartbeats on the
5862 * speicifed address. Note that if the address
5863 * field is empty all addresses for the association
5864 * will have their heartbeats disabled. Note also
5865 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5866 * mutually exclusive, only one of these two should
5867 * be specified. Enabling both fields will have
5868 * undetermined results.
5870 * SPP_HB_DEMAND - Request a user initiated heartbeat
5871 * to be made immediately.
5873 * SPP_PMTUD_ENABLE - This field will enable PMTU
5874 * discovery upon the specified address. Note that
5875 * if the address feild is empty then all addresses
5876 * on the association are effected.
5878 * SPP_PMTUD_DISABLE - This field will disable PMTU
5879 * discovery upon the specified address. Note that
5880 * if the address feild is empty then all addresses
5881 * on the association are effected. Not also that
5882 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5883 * exclusive. Enabling both will have undetermined
5886 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5887 * on delayed sack. The time specified in spp_sackdelay
5888 * is used to specify the sack delay for this address. Note
5889 * that if spp_address is empty then all addresses will
5890 * enable delayed sack and take on the sack delay
5891 * value specified in spp_sackdelay.
5892 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5893 * off delayed sack. If the spp_address field is blank then
5894 * delayed sack is disabled for the entire association. Note
5895 * also that this field is mutually exclusive to
5896 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5899 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5900 * setting of the IPV6 flow label value. The value is
5901 * contained in the spp_ipv6_flowlabel field.
5902 * Upon retrieval, this flag will be set to indicate that
5903 * the spp_ipv6_flowlabel field has a valid value returned.
5904 * If a specific destination address is set (in the
5905 * spp_address field), then the value returned is that of
5906 * the address. If just an association is specified (and
5907 * no address), then the association's default flow label
5908 * is returned. If neither an association nor a destination
5909 * is specified, then the socket's default flow label is
5910 * returned. For non-IPv6 sockets, this flag will be left
5913 * SPP_DSCP: Setting this flag enables the setting of the
5914 * Differentiated Services Code Point (DSCP) value
5915 * associated with either the association or a specific
5916 * address. The value is obtained in the spp_dscp field.
5917 * Upon retrieval, this flag will be set to indicate that
5918 * the spp_dscp field has a valid value returned. If a
5919 * specific destination address is set when called (in the
5920 * spp_address field), then that specific destination
5921 * address's DSCP value is returned. If just an association
5922 * is specified, then the association's default DSCP is
5923 * returned. If neither an association nor a destination is
5924 * specified, then the socket's default DSCP is returned.
5926 * spp_ipv6_flowlabel
5927 * - This field is used in conjunction with the
5928 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5929 * The 20 least significant bits are used for the flow
5930 * label. This setting has precedence over any IPv6-layer
5933 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5934 * and contains the DSCP. The 6 most significant bits are
5935 * used for the DSCP. This setting has precedence over any
5936 * IPv4- or IPv6- layer setting.
5938 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5939 char __user *optval, int __user *optlen)
5941 struct sctp_paddrparams params;
5942 struct sctp_transport *trans = NULL;
5943 struct sctp_association *asoc = NULL;
5944 struct sctp_sock *sp = sctp_sk(sk);
5946 if (len >= sizeof(params))
5947 len = sizeof(params);
5948 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5949 spp_ipv6_flowlabel), 4))
5950 len = ALIGN(offsetof(struct sctp_paddrparams,
5951 spp_ipv6_flowlabel), 4);
5955 if (copy_from_user(¶ms, optval, len))
5958 /* If an address other than INADDR_ANY is specified, and
5959 * no transport is found, then the request is invalid.
5961 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5962 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5963 params.spp_assoc_id);
5965 pr_debug("%s: failed no transport\n", __func__);
5970 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5971 * socket is a one to many style socket, and an association
5972 * was not found, then the id was invalid.
5974 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5975 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5976 sctp_style(sk, UDP)) {
5977 pr_debug("%s: failed no association\n", __func__);
5982 /* Fetch transport values. */
5983 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5984 params.spp_pathmtu = trans->pathmtu;
5985 params.spp_pathmaxrxt = trans->pathmaxrxt;
5986 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5988 /*draft-11 doesn't say what to return in spp_flags*/
5989 params.spp_flags = trans->param_flags;
5990 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5991 params.spp_ipv6_flowlabel = trans->flowlabel &
5992 SCTP_FLOWLABEL_VAL_MASK;
5993 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5995 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5996 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5997 params.spp_flags |= SPP_DSCP;
6000 /* Fetch association values. */
6001 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
6002 params.spp_pathmtu = asoc->pathmtu;
6003 params.spp_pathmaxrxt = asoc->pathmaxrxt;
6004 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
6006 /*draft-11 doesn't say what to return in spp_flags*/
6007 params.spp_flags = asoc->param_flags;
6008 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6009 params.spp_ipv6_flowlabel = asoc->flowlabel &
6010 SCTP_FLOWLABEL_VAL_MASK;
6011 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6013 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
6014 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
6015 params.spp_flags |= SPP_DSCP;
6018 /* Fetch socket values. */
6019 params.spp_hbinterval = sp->hbinterval;
6020 params.spp_pathmtu = sp->pathmtu;
6021 params.spp_sackdelay = sp->sackdelay;
6022 params.spp_pathmaxrxt = sp->pathmaxrxt;
6024 /*draft-11 doesn't say what to return in spp_flags*/
6025 params.spp_flags = sp->param_flags;
6026 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6027 params.spp_ipv6_flowlabel = sp->flowlabel &
6028 SCTP_FLOWLABEL_VAL_MASK;
6029 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6031 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6032 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6033 params.spp_flags |= SPP_DSCP;
6037 if (copy_to_user(optval, ¶ms, len))
6040 if (put_user(len, optlen))
6047 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6049 * This option will effect the way delayed acks are performed. This
6050 * option allows you to get or set the delayed ack time, in
6051 * milliseconds. It also allows changing the delayed ack frequency.
6052 * Changing the frequency to 1 disables the delayed sack algorithm. If
6053 * the assoc_id is 0, then this sets or gets the endpoints default
6054 * values. If the assoc_id field is non-zero, then the set or get
6055 * effects the specified association for the one to many model (the
6056 * assoc_id field is ignored by the one to one model). Note that if
6057 * sack_delay or sack_freq are 0 when setting this option, then the
6058 * current values will remain unchanged.
6060 * struct sctp_sack_info {
6061 * sctp_assoc_t sack_assoc_id;
6062 * uint32_t sack_delay;
6063 * uint32_t sack_freq;
6066 * sack_assoc_id - This parameter, indicates which association the user
6067 * is performing an action upon. Note that if this field's value is
6068 * zero then the endpoints default value is changed (effecting future
6069 * associations only).
6071 * sack_delay - This parameter contains the number of milliseconds that
6072 * the user is requesting the delayed ACK timer be set to. Note that
6073 * this value is defined in the standard to be between 200 and 500
6076 * sack_freq - This parameter contains the number of packets that must
6077 * be received before a sack is sent without waiting for the delay
6078 * timer to expire. The default value for this is 2, setting this
6079 * value to 1 will disable the delayed sack algorithm.
6081 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6082 char __user *optval,
6085 struct sctp_sack_info params;
6086 struct sctp_association *asoc = NULL;
6087 struct sctp_sock *sp = sctp_sk(sk);
6089 if (len >= sizeof(struct sctp_sack_info)) {
6090 len = sizeof(struct sctp_sack_info);
6092 if (copy_from_user(¶ms, optval, len))
6094 } else if (len == sizeof(struct sctp_assoc_value)) {
6095 pr_warn_ratelimited(DEPRECATED
6097 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6098 "Use struct sctp_sack_info instead\n",
6099 current->comm, task_pid_nr(current));
6100 if (copy_from_user(¶ms, optval, len))
6105 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6106 * socket is a one to many style socket, and an association
6107 * was not found, then the id was invalid.
6109 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6110 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6111 sctp_style(sk, UDP))
6115 /* Fetch association values. */
6116 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6117 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6118 params.sack_freq = asoc->sackfreq;
6121 params.sack_delay = 0;
6122 params.sack_freq = 1;
6125 /* Fetch socket values. */
6126 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6127 params.sack_delay = sp->sackdelay;
6128 params.sack_freq = sp->sackfreq;
6130 params.sack_delay = 0;
6131 params.sack_freq = 1;
6135 if (copy_to_user(optval, ¶ms, len))
6138 if (put_user(len, optlen))
6144 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6146 * Applications can specify protocol parameters for the default association
6147 * initialization. The option name argument to setsockopt() and getsockopt()
6150 * Setting initialization parameters is effective only on an unconnected
6151 * socket (for UDP-style sockets only future associations are effected
6152 * by the change). With TCP-style sockets, this option is inherited by
6153 * sockets derived from a listener socket.
6155 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6157 if (len < sizeof(struct sctp_initmsg))
6159 len = sizeof(struct sctp_initmsg);
6160 if (put_user(len, optlen))
6162 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6168 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6169 char __user *optval, int __user *optlen)
6171 struct sctp_association *asoc;
6173 struct sctp_getaddrs getaddrs;
6174 struct sctp_transport *from;
6176 union sctp_addr temp;
6177 struct sctp_sock *sp = sctp_sk(sk);
6182 if (len < sizeof(struct sctp_getaddrs))
6185 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6188 /* For UDP-style sockets, id specifies the association to query. */
6189 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6193 to = optval + offsetof(struct sctp_getaddrs, addrs);
6194 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6196 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6198 memcpy(&temp, &from->ipaddr, sizeof(temp));
6199 addrlen = sctp_get_pf_specific(sk->sk_family)
6200 ->addr_to_user(sp, &temp);
6201 if (space_left < addrlen)
6203 if (copy_to_user(to, &temp, addrlen))
6207 space_left -= addrlen;
6210 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6212 bytes_copied = ((char __user *)to) - optval;
6213 if (put_user(bytes_copied, optlen))
6219 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6220 size_t space_left, int *bytes_copied)
6222 struct sctp_sockaddr_entry *addr;
6223 union sctp_addr temp;
6226 struct net *net = sock_net(sk);
6229 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6233 if ((PF_INET == sk->sk_family) &&
6234 (AF_INET6 == addr->a.sa.sa_family))
6236 if ((PF_INET6 == sk->sk_family) &&
6237 inet_v6_ipv6only(sk) &&
6238 (AF_INET == addr->a.sa.sa_family))
6240 memcpy(&temp, &addr->a, sizeof(temp));
6241 if (!temp.v4.sin_port)
6242 temp.v4.sin_port = htons(port);
6244 addrlen = sctp_get_pf_specific(sk->sk_family)
6245 ->addr_to_user(sctp_sk(sk), &temp);
6247 if (space_left < addrlen) {
6251 memcpy(to, &temp, addrlen);
6255 space_left -= addrlen;
6256 *bytes_copied += addrlen;
6264 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6265 char __user *optval, int __user *optlen)
6267 struct sctp_bind_addr *bp;
6268 struct sctp_association *asoc;
6270 struct sctp_getaddrs getaddrs;
6271 struct sctp_sockaddr_entry *addr;
6273 union sctp_addr temp;
6274 struct sctp_sock *sp = sctp_sk(sk);
6278 int bytes_copied = 0;
6282 if (len < sizeof(struct sctp_getaddrs))
6285 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6289 * For UDP-style sockets, id specifies the association to query.
6290 * If the id field is set to the value '0' then the locally bound
6291 * addresses are returned without regard to any particular
6294 if (0 == getaddrs.assoc_id) {
6295 bp = &sctp_sk(sk)->ep->base.bind_addr;
6297 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6300 bp = &asoc->base.bind_addr;
6303 to = optval + offsetof(struct sctp_getaddrs, addrs);
6304 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6306 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6310 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6311 * addresses from the global local address list.
6313 if (sctp_list_single_entry(&bp->address_list)) {
6314 addr = list_entry(bp->address_list.next,
6315 struct sctp_sockaddr_entry, list);
6316 if (sctp_is_any(sk, &addr->a)) {
6317 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6318 space_left, &bytes_copied);
6328 /* Protection on the bound address list is not needed since
6329 * in the socket option context we hold a socket lock and
6330 * thus the bound address list can't change.
6332 list_for_each_entry(addr, &bp->address_list, list) {
6333 memcpy(&temp, &addr->a, sizeof(temp));
6334 addrlen = sctp_get_pf_specific(sk->sk_family)
6335 ->addr_to_user(sp, &temp);
6336 if (space_left < addrlen) {
6337 err = -ENOMEM; /*fixme: right error?*/
6340 memcpy(buf, &temp, addrlen);
6342 bytes_copied += addrlen;
6344 space_left -= addrlen;
6348 if (copy_to_user(to, addrs, bytes_copied)) {
6352 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6356 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6357 * but we can't change it anymore.
6359 if (put_user(bytes_copied, optlen))
6366 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6368 * Requests that the local SCTP stack use the enclosed peer address as
6369 * the association primary. The enclosed address must be one of the
6370 * association peer's addresses.
6372 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6373 char __user *optval, int __user *optlen)
6375 struct sctp_prim prim;
6376 struct sctp_association *asoc;
6377 struct sctp_sock *sp = sctp_sk(sk);
6379 if (len < sizeof(struct sctp_prim))
6382 len = sizeof(struct sctp_prim);
6384 if (copy_from_user(&prim, optval, len))
6387 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6391 if (!asoc->peer.primary_path)
6394 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6395 asoc->peer.primary_path->af_specific->sockaddr_len);
6397 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6398 (union sctp_addr *)&prim.ssp_addr);
6400 if (put_user(len, optlen))
6402 if (copy_to_user(optval, &prim, len))
6409 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6411 * Requests that the local endpoint set the specified Adaptation Layer
6412 * Indication parameter for all future INIT and INIT-ACK exchanges.
6414 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6415 char __user *optval, int __user *optlen)
6417 struct sctp_setadaptation adaptation;
6419 if (len < sizeof(struct sctp_setadaptation))
6422 len = sizeof(struct sctp_setadaptation);
6424 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6426 if (put_user(len, optlen))
6428 if (copy_to_user(optval, &adaptation, len))
6436 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6438 * Applications that wish to use the sendto() system call may wish to
6439 * specify a default set of parameters that would normally be supplied
6440 * through the inclusion of ancillary data. This socket option allows
6441 * such an application to set the default sctp_sndrcvinfo structure.
6444 * The application that wishes to use this socket option simply passes
6445 * in to this call the sctp_sndrcvinfo structure defined in Section
6446 * 5.2.2) The input parameters accepted by this call include
6447 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6448 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6449 * to this call if the caller is using the UDP model.
6451 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6453 static int sctp_getsockopt_default_send_param(struct sock *sk,
6454 int len, char __user *optval,
6457 struct sctp_sock *sp = sctp_sk(sk);
6458 struct sctp_association *asoc;
6459 struct sctp_sndrcvinfo info;
6461 if (len < sizeof(info))
6466 if (copy_from_user(&info, optval, len))
6469 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6470 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6471 sctp_style(sk, UDP))
6475 info.sinfo_stream = asoc->default_stream;
6476 info.sinfo_flags = asoc->default_flags;
6477 info.sinfo_ppid = asoc->default_ppid;
6478 info.sinfo_context = asoc->default_context;
6479 info.sinfo_timetolive = asoc->default_timetolive;
6481 info.sinfo_stream = sp->default_stream;
6482 info.sinfo_flags = sp->default_flags;
6483 info.sinfo_ppid = sp->default_ppid;
6484 info.sinfo_context = sp->default_context;
6485 info.sinfo_timetolive = sp->default_timetolive;
6488 if (put_user(len, optlen))
6490 if (copy_to_user(optval, &info, len))
6496 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6497 * (SCTP_DEFAULT_SNDINFO)
6499 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6500 char __user *optval,
6503 struct sctp_sock *sp = sctp_sk(sk);
6504 struct sctp_association *asoc;
6505 struct sctp_sndinfo info;
6507 if (len < sizeof(info))
6512 if (copy_from_user(&info, optval, len))
6515 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6516 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6517 sctp_style(sk, UDP))
6521 info.snd_sid = asoc->default_stream;
6522 info.snd_flags = asoc->default_flags;
6523 info.snd_ppid = asoc->default_ppid;
6524 info.snd_context = asoc->default_context;
6526 info.snd_sid = sp->default_stream;
6527 info.snd_flags = sp->default_flags;
6528 info.snd_ppid = sp->default_ppid;
6529 info.snd_context = sp->default_context;
6532 if (put_user(len, optlen))
6534 if (copy_to_user(optval, &info, len))
6542 * 7.1.5 SCTP_NODELAY
6544 * Turn on/off any Nagle-like algorithm. This means that packets are
6545 * generally sent as soon as possible and no unnecessary delays are
6546 * introduced, at the cost of more packets in the network. Expects an
6547 * integer boolean flag.
6550 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6551 char __user *optval, int __user *optlen)
6555 if (len < sizeof(int))
6559 val = (sctp_sk(sk)->nodelay == 1);
6560 if (put_user(len, optlen))
6562 if (copy_to_user(optval, &val, len))
6569 * 7.1.1 SCTP_RTOINFO
6571 * The protocol parameters used to initialize and bound retransmission
6572 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6573 * and modify these parameters.
6574 * All parameters are time values, in milliseconds. A value of 0, when
6575 * modifying the parameters, indicates that the current value should not
6579 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6580 char __user *optval,
6581 int __user *optlen) {
6582 struct sctp_rtoinfo rtoinfo;
6583 struct sctp_association *asoc;
6585 if (len < sizeof (struct sctp_rtoinfo))
6588 len = sizeof(struct sctp_rtoinfo);
6590 if (copy_from_user(&rtoinfo, optval, len))
6593 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6595 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6596 sctp_style(sk, UDP))
6599 /* Values corresponding to the specific association. */
6601 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6602 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6603 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6605 /* Values corresponding to the endpoint. */
6606 struct sctp_sock *sp = sctp_sk(sk);
6608 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6609 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6610 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6613 if (put_user(len, optlen))
6616 if (copy_to_user(optval, &rtoinfo, len))
6624 * 7.1.2 SCTP_ASSOCINFO
6626 * This option is used to tune the maximum retransmission attempts
6627 * of the association.
6628 * Returns an error if the new association retransmission value is
6629 * greater than the sum of the retransmission value of the peer.
6630 * See [SCTP] for more information.
6633 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6634 char __user *optval,
6638 struct sctp_assocparams assocparams;
6639 struct sctp_association *asoc;
6640 struct list_head *pos;
6643 if (len < sizeof (struct sctp_assocparams))
6646 len = sizeof(struct sctp_assocparams);
6648 if (copy_from_user(&assocparams, optval, len))
6651 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6653 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6654 sctp_style(sk, UDP))
6657 /* Values correspoinding to the specific association */
6659 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6660 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6661 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6662 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6664 list_for_each(pos, &asoc->peer.transport_addr_list) {
6668 assocparams.sasoc_number_peer_destinations = cnt;
6670 /* Values corresponding to the endpoint */
6671 struct sctp_sock *sp = sctp_sk(sk);
6673 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6674 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6675 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6676 assocparams.sasoc_cookie_life =
6677 sp->assocparams.sasoc_cookie_life;
6678 assocparams.sasoc_number_peer_destinations =
6680 sasoc_number_peer_destinations;
6683 if (put_user(len, optlen))
6686 if (copy_to_user(optval, &assocparams, len))
6693 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6695 * This socket option is a boolean flag which turns on or off mapped V4
6696 * addresses. If this option is turned on and the socket is type
6697 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6698 * If this option is turned off, then no mapping will be done of V4
6699 * addresses and a user will receive both PF_INET6 and PF_INET type
6700 * addresses on the socket.
6702 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6703 char __user *optval, int __user *optlen)
6706 struct sctp_sock *sp = sctp_sk(sk);
6708 if (len < sizeof(int))
6713 if (put_user(len, optlen))
6715 if (copy_to_user(optval, &val, len))
6722 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6723 * (chapter and verse is quoted at sctp_setsockopt_context())
6725 static int sctp_getsockopt_context(struct sock *sk, int len,
6726 char __user *optval, int __user *optlen)
6728 struct sctp_assoc_value params;
6729 struct sctp_association *asoc;
6731 if (len < sizeof(struct sctp_assoc_value))
6734 len = sizeof(struct sctp_assoc_value);
6736 if (copy_from_user(¶ms, optval, len))
6739 asoc = sctp_id2assoc(sk, params.assoc_id);
6740 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6741 sctp_style(sk, UDP))
6744 params.assoc_value = asoc ? asoc->default_rcv_context
6745 : sctp_sk(sk)->default_rcv_context;
6747 if (put_user(len, optlen))
6749 if (copy_to_user(optval, ¶ms, len))
6756 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6757 * This option will get or set the maximum size to put in any outgoing
6758 * SCTP DATA chunk. If a message is larger than this size it will be
6759 * fragmented by SCTP into the specified size. Note that the underlying
6760 * SCTP implementation may fragment into smaller sized chunks when the
6761 * PMTU of the underlying association is smaller than the value set by
6762 * the user. The default value for this option is '0' which indicates
6763 * the user is NOT limiting fragmentation and only the PMTU will effect
6764 * SCTP's choice of DATA chunk size. Note also that values set larger
6765 * than the maximum size of an IP datagram will effectively let SCTP
6766 * control fragmentation (i.e. the same as setting this option to 0).
6768 * The following structure is used to access and modify this parameter:
6770 * struct sctp_assoc_value {
6771 * sctp_assoc_t assoc_id;
6772 * uint32_t assoc_value;
6775 * assoc_id: This parameter is ignored for one-to-one style sockets.
6776 * For one-to-many style sockets this parameter indicates which
6777 * association the user is performing an action upon. Note that if
6778 * this field's value is zero then the endpoints default value is
6779 * changed (effecting future associations only).
6780 * assoc_value: This parameter specifies the maximum size in bytes.
6782 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6783 char __user *optval, int __user *optlen)
6785 struct sctp_assoc_value params;
6786 struct sctp_association *asoc;
6788 if (len == sizeof(int)) {
6789 pr_warn_ratelimited(DEPRECATED
6791 "Use of int in maxseg socket option.\n"
6792 "Use struct sctp_assoc_value instead\n",
6793 current->comm, task_pid_nr(current));
6794 params.assoc_id = SCTP_FUTURE_ASSOC;
6795 } else if (len >= sizeof(struct sctp_assoc_value)) {
6796 len = sizeof(struct sctp_assoc_value);
6797 if (copy_from_user(¶ms, optval, len))
6802 asoc = sctp_id2assoc(sk, params.assoc_id);
6803 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6804 sctp_style(sk, UDP))
6808 params.assoc_value = asoc->frag_point;
6810 params.assoc_value = sctp_sk(sk)->user_frag;
6812 if (put_user(len, optlen))
6814 if (len == sizeof(int)) {
6815 if (copy_to_user(optval, ¶ms.assoc_value, len))
6818 if (copy_to_user(optval, ¶ms, len))
6826 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6827 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6829 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6830 char __user *optval, int __user *optlen)
6834 if (len < sizeof(int))
6839 val = sctp_sk(sk)->frag_interleave;
6840 if (put_user(len, optlen))
6842 if (copy_to_user(optval, &val, len))
6849 * 7.1.25. Set or Get the sctp partial delivery point
6850 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6852 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6853 char __user *optval,
6858 if (len < sizeof(u32))
6863 val = sctp_sk(sk)->pd_point;
6864 if (put_user(len, optlen))
6866 if (copy_to_user(optval, &val, len))
6873 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6874 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6876 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6877 char __user *optval,
6880 struct sctp_assoc_value params;
6881 struct sctp_association *asoc;
6883 if (len == sizeof(int)) {
6884 pr_warn_ratelimited(DEPRECATED
6886 "Use of int in max_burst socket option.\n"
6887 "Use struct sctp_assoc_value instead\n",
6888 current->comm, task_pid_nr(current));
6889 params.assoc_id = SCTP_FUTURE_ASSOC;
6890 } else if (len >= sizeof(struct sctp_assoc_value)) {
6891 len = sizeof(struct sctp_assoc_value);
6892 if (copy_from_user(¶ms, optval, len))
6897 asoc = sctp_id2assoc(sk, params.assoc_id);
6898 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6899 sctp_style(sk, UDP))
6902 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6904 if (len == sizeof(int)) {
6905 if (copy_to_user(optval, ¶ms.assoc_value, len))
6908 if (copy_to_user(optval, ¶ms, len))
6916 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6917 char __user *optval, int __user *optlen)
6919 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6920 struct sctp_hmacalgo __user *p = (void __user *)optval;
6921 struct sctp_hmac_algo_param *hmacs;
6926 if (!ep->auth_enable)
6929 hmacs = ep->auth_hmacs_list;
6930 data_len = ntohs(hmacs->param_hdr.length) -
6931 sizeof(struct sctp_paramhdr);
6933 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6936 len = sizeof(struct sctp_hmacalgo) + data_len;
6937 num_idents = data_len / sizeof(u16);
6939 if (put_user(len, optlen))
6941 if (put_user(num_idents, &p->shmac_num_idents))
6943 for (i = 0; i < num_idents; i++) {
6944 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6946 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6952 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6953 char __user *optval, int __user *optlen)
6955 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6956 struct sctp_authkeyid val;
6957 struct sctp_association *asoc;
6959 if (!ep->auth_enable)
6962 if (len < sizeof(struct sctp_authkeyid))
6965 len = sizeof(struct sctp_authkeyid);
6966 if (copy_from_user(&val, optval, len))
6969 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6970 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6974 val.scact_keynumber = asoc->active_key_id;
6976 val.scact_keynumber = ep->active_key_id;
6978 if (put_user(len, optlen))
6980 if (copy_to_user(optval, &val, len))
6986 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6987 char __user *optval, int __user *optlen)
6989 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6990 struct sctp_authchunks __user *p = (void __user *)optval;
6991 struct sctp_authchunks val;
6992 struct sctp_association *asoc;
6993 struct sctp_chunks_param *ch;
6997 if (!ep->auth_enable)
7000 if (len < sizeof(struct sctp_authchunks))
7003 if (copy_from_user(&val, optval, sizeof(val)))
7006 to = p->gauth_chunks;
7007 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7011 ch = asoc->peer.peer_chunks;
7015 /* See if the user provided enough room for all the data */
7016 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7017 if (len < num_chunks)
7020 if (copy_to_user(to, ch->chunks, num_chunks))
7023 len = sizeof(struct sctp_authchunks) + num_chunks;
7024 if (put_user(len, optlen))
7026 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7031 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7032 char __user *optval, int __user *optlen)
7034 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7035 struct sctp_authchunks __user *p = (void __user *)optval;
7036 struct sctp_authchunks val;
7037 struct sctp_association *asoc;
7038 struct sctp_chunks_param *ch;
7042 if (!ep->auth_enable)
7045 if (len < sizeof(struct sctp_authchunks))
7048 if (copy_from_user(&val, optval, sizeof(val)))
7051 to = p->gauth_chunks;
7052 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7053 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7054 sctp_style(sk, UDP))
7057 ch = asoc ? (struct sctp_chunks_param *)asoc->c.auth_chunks
7058 : ep->auth_chunk_list;
7062 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7063 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7066 if (copy_to_user(to, ch->chunks, num_chunks))
7069 len = sizeof(struct sctp_authchunks) + num_chunks;
7070 if (put_user(len, optlen))
7072 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7079 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7080 * This option gets the current number of associations that are attached
7081 * to a one-to-many style socket. The option value is an uint32_t.
7083 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7084 char __user *optval, int __user *optlen)
7086 struct sctp_sock *sp = sctp_sk(sk);
7087 struct sctp_association *asoc;
7090 if (sctp_style(sk, TCP))
7093 if (len < sizeof(u32))
7098 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7102 if (put_user(len, optlen))
7104 if (copy_to_user(optval, &val, len))
7111 * 8.1.23 SCTP_AUTO_ASCONF
7112 * See the corresponding setsockopt entry as description
7114 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7115 char __user *optval, int __user *optlen)
7119 if (len < sizeof(int))
7123 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7125 if (put_user(len, optlen))
7127 if (copy_to_user(optval, &val, len))
7133 * 8.2.6. Get the Current Identifiers of Associations
7134 * (SCTP_GET_ASSOC_ID_LIST)
7136 * This option gets the current list of SCTP association identifiers of
7137 * the SCTP associations handled by a one-to-many style socket.
7139 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7140 char __user *optval, int __user *optlen)
7142 struct sctp_sock *sp = sctp_sk(sk);
7143 struct sctp_association *asoc;
7144 struct sctp_assoc_ids *ids;
7147 if (sctp_style(sk, TCP))
7150 if (len < sizeof(struct sctp_assoc_ids))
7153 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7157 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
7160 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
7162 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7166 ids->gaids_number_of_ids = num;
7168 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7169 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7172 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7182 * SCTP_PEER_ADDR_THLDS
7184 * This option allows us to fetch the partially failed threshold for one or all
7185 * transports in an association. See Section 6.1 of:
7186 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7188 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7189 char __user *optval,
7193 struct sctp_paddrthlds val;
7194 struct sctp_transport *trans;
7195 struct sctp_association *asoc;
7197 if (len < sizeof(struct sctp_paddrthlds))
7199 len = sizeof(struct sctp_paddrthlds);
7200 if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
7203 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7204 trans = sctp_addr_id2transport(sk, &val.spt_address,
7209 val.spt_pathmaxrxt = trans->pathmaxrxt;
7210 val.spt_pathpfthld = trans->pf_retrans;
7215 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7216 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7217 sctp_style(sk, UDP))
7221 val.spt_pathpfthld = asoc->pf_retrans;
7222 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7224 struct sctp_sock *sp = sctp_sk(sk);
7226 val.spt_pathpfthld = sp->pf_retrans;
7227 val.spt_pathmaxrxt = sp->pathmaxrxt;
7230 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7237 * SCTP_GET_ASSOC_STATS
7239 * This option retrieves local per endpoint statistics. It is modeled
7240 * after OpenSolaris' implementation
7242 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7243 char __user *optval,
7246 struct sctp_assoc_stats sas;
7247 struct sctp_association *asoc = NULL;
7249 /* User must provide at least the assoc id */
7250 if (len < sizeof(sctp_assoc_t))
7253 /* Allow the struct to grow and fill in as much as possible */
7254 len = min_t(size_t, len, sizeof(sas));
7256 if (copy_from_user(&sas, optval, len))
7259 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7263 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7264 sas.sas_gapcnt = asoc->stats.gapcnt;
7265 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7266 sas.sas_osacks = asoc->stats.osacks;
7267 sas.sas_isacks = asoc->stats.isacks;
7268 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7269 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7270 sas.sas_oodchunks = asoc->stats.oodchunks;
7271 sas.sas_iodchunks = asoc->stats.iodchunks;
7272 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7273 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7274 sas.sas_idupchunks = asoc->stats.idupchunks;
7275 sas.sas_opackets = asoc->stats.opackets;
7276 sas.sas_ipackets = asoc->stats.ipackets;
7278 /* New high max rto observed, will return 0 if not a single
7279 * RTO update took place. obs_rto_ipaddr will be bogus
7282 sas.sas_maxrto = asoc->stats.max_obs_rto;
7283 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7284 sizeof(struct sockaddr_storage));
7286 /* Mark beginning of a new observation period */
7287 asoc->stats.max_obs_rto = asoc->rto_min;
7289 if (put_user(len, optlen))
7292 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7294 if (copy_to_user(optval, &sas, len))
7300 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7301 char __user *optval,
7306 if (len < sizeof(int))
7310 if (sctp_sk(sk)->recvrcvinfo)
7312 if (put_user(len, optlen))
7314 if (copy_to_user(optval, &val, len))
7320 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7321 char __user *optval,
7326 if (len < sizeof(int))
7330 if (sctp_sk(sk)->recvnxtinfo)
7332 if (put_user(len, optlen))
7334 if (copy_to_user(optval, &val, len))
7340 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7341 char __user *optval,
7344 struct sctp_assoc_value params;
7345 struct sctp_association *asoc;
7346 int retval = -EFAULT;
7348 if (len < sizeof(params)) {
7353 len = sizeof(params);
7354 if (copy_from_user(¶ms, optval, len))
7357 asoc = sctp_id2assoc(sk, params.assoc_id);
7358 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7359 sctp_style(sk, UDP)) {
7364 params.assoc_value = asoc ? asoc->prsctp_enable
7365 : sctp_sk(sk)->ep->prsctp_enable;
7367 if (put_user(len, optlen))
7370 if (copy_to_user(optval, ¶ms, len))
7379 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7380 char __user *optval,
7383 struct sctp_default_prinfo info;
7384 struct sctp_association *asoc;
7385 int retval = -EFAULT;
7387 if (len < sizeof(info)) {
7393 if (copy_from_user(&info, optval, len))
7396 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7397 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7398 sctp_style(sk, UDP)) {
7404 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7405 info.pr_value = asoc->default_timetolive;
7407 struct sctp_sock *sp = sctp_sk(sk);
7409 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7410 info.pr_value = sp->default_timetolive;
7413 if (put_user(len, optlen))
7416 if (copy_to_user(optval, &info, len))
7425 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7426 char __user *optval,
7429 struct sctp_prstatus params;
7430 struct sctp_association *asoc;
7432 int retval = -EINVAL;
7434 if (len < sizeof(params))
7437 len = sizeof(params);
7438 if (copy_from_user(¶ms, optval, len)) {
7443 policy = params.sprstat_policy;
7444 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7445 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7448 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7452 if (policy == SCTP_PR_SCTP_ALL) {
7453 params.sprstat_abandoned_unsent = 0;
7454 params.sprstat_abandoned_sent = 0;
7455 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7456 params.sprstat_abandoned_unsent +=
7457 asoc->abandoned_unsent[policy];
7458 params.sprstat_abandoned_sent +=
7459 asoc->abandoned_sent[policy];
7462 params.sprstat_abandoned_unsent =
7463 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7464 params.sprstat_abandoned_sent =
7465 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7468 if (put_user(len, optlen)) {
7473 if (copy_to_user(optval, ¶ms, len)) {
7484 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7485 char __user *optval,
7488 struct sctp_stream_out_ext *streamoute;
7489 struct sctp_association *asoc;
7490 struct sctp_prstatus params;
7491 int retval = -EINVAL;
7494 if (len < sizeof(params))
7497 len = sizeof(params);
7498 if (copy_from_user(¶ms, optval, len)) {
7503 policy = params.sprstat_policy;
7504 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7505 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7508 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7509 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7512 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7514 /* Not allocated yet, means all stats are 0 */
7515 params.sprstat_abandoned_unsent = 0;
7516 params.sprstat_abandoned_sent = 0;
7521 if (policy == SCTP_PR_SCTP_ALL) {
7522 params.sprstat_abandoned_unsent = 0;
7523 params.sprstat_abandoned_sent = 0;
7524 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7525 params.sprstat_abandoned_unsent +=
7526 streamoute->abandoned_unsent[policy];
7527 params.sprstat_abandoned_sent +=
7528 streamoute->abandoned_sent[policy];
7531 params.sprstat_abandoned_unsent =
7532 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7533 params.sprstat_abandoned_sent =
7534 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7537 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7548 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7549 char __user *optval,
7552 struct sctp_assoc_value params;
7553 struct sctp_association *asoc;
7554 int retval = -EFAULT;
7556 if (len < sizeof(params)) {
7561 len = sizeof(params);
7562 if (copy_from_user(¶ms, optval, len))
7565 asoc = sctp_id2assoc(sk, params.assoc_id);
7566 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7567 sctp_style(sk, UDP)) {
7572 params.assoc_value = asoc ? asoc->reconf_enable
7573 : sctp_sk(sk)->ep->reconf_enable;
7575 if (put_user(len, optlen))
7578 if (copy_to_user(optval, ¶ms, len))
7587 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7588 char __user *optval,
7591 struct sctp_assoc_value params;
7592 struct sctp_association *asoc;
7593 int retval = -EFAULT;
7595 if (len < sizeof(params)) {
7600 len = sizeof(params);
7601 if (copy_from_user(¶ms, optval, len))
7604 asoc = sctp_id2assoc(sk, params.assoc_id);
7605 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7606 sctp_style(sk, UDP)) {
7611 params.assoc_value = asoc ? asoc->strreset_enable
7612 : sctp_sk(sk)->ep->strreset_enable;
7614 if (put_user(len, optlen))
7617 if (copy_to_user(optval, ¶ms, len))
7626 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7627 char __user *optval,
7630 struct sctp_assoc_value params;
7631 struct sctp_association *asoc;
7632 int retval = -EFAULT;
7634 if (len < sizeof(params)) {
7639 len = sizeof(params);
7640 if (copy_from_user(¶ms, optval, len))
7643 asoc = sctp_id2assoc(sk, params.assoc_id);
7644 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7645 sctp_style(sk, UDP)) {
7650 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7651 : sctp_sk(sk)->default_ss;
7653 if (put_user(len, optlen))
7656 if (copy_to_user(optval, ¶ms, len))
7665 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7666 char __user *optval,
7669 struct sctp_stream_value params;
7670 struct sctp_association *asoc;
7671 int retval = -EFAULT;
7673 if (len < sizeof(params)) {
7678 len = sizeof(params);
7679 if (copy_from_user(¶ms, optval, len))
7682 asoc = sctp_id2assoc(sk, params.assoc_id);
7688 retval = sctp_sched_get_value(asoc, params.stream_id,
7689 ¶ms.stream_value);
7693 if (put_user(len, optlen)) {
7698 if (copy_to_user(optval, ¶ms, len)) {
7707 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7708 char __user *optval,
7711 struct sctp_assoc_value params;
7712 struct sctp_association *asoc;
7713 int retval = -EFAULT;
7715 if (len < sizeof(params)) {
7720 len = sizeof(params);
7721 if (copy_from_user(¶ms, optval, len))
7724 asoc = sctp_id2assoc(sk, params.assoc_id);
7725 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7726 sctp_style(sk, UDP)) {
7731 params.assoc_value = asoc ? asoc->intl_enable
7732 : sctp_sk(sk)->strm_interleave;
7734 if (put_user(len, optlen))
7737 if (copy_to_user(optval, ¶ms, len))
7746 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7747 char __user *optval,
7752 if (len < sizeof(int))
7756 val = sctp_sk(sk)->reuse;
7757 if (put_user(len, optlen))
7760 if (copy_to_user(optval, &val, len))
7766 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7769 struct sctp_association *asoc;
7770 struct sctp_event param;
7773 if (len < sizeof(param))
7776 len = sizeof(param);
7777 if (copy_from_user(¶m, optval, len))
7780 if (param.se_type < SCTP_SN_TYPE_BASE ||
7781 param.se_type > SCTP_SN_TYPE_MAX)
7784 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7785 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7786 sctp_style(sk, UDP))
7789 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7790 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7792 if (put_user(len, optlen))
7795 if (copy_to_user(optval, ¶m, len))
7801 static int sctp_getsockopt(struct sock *sk, int level, int optname,
7802 char __user *optval, int __user *optlen)
7807 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
7809 /* I can hardly begin to describe how wrong this is. This is
7810 * so broken as to be worse than useless. The API draft
7811 * REALLY is NOT helpful here... I am not convinced that the
7812 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
7813 * are at all well-founded.
7815 if (level != SOL_SCTP) {
7816 struct sctp_af *af = sctp_sk(sk)->pf->af;
7818 retval = af->getsockopt(sk, level, optname, optval, optlen);
7822 if (get_user(len, optlen))
7832 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
7834 case SCTP_DISABLE_FRAGMENTS:
7835 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
7839 retval = sctp_getsockopt_events(sk, len, optval, optlen);
7841 case SCTP_AUTOCLOSE:
7842 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
7844 case SCTP_SOCKOPT_PEELOFF:
7845 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
7847 case SCTP_SOCKOPT_PEELOFF_FLAGS:
7848 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
7850 case SCTP_PEER_ADDR_PARAMS:
7851 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
7854 case SCTP_DELAYED_SACK:
7855 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7859 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
7861 case SCTP_GET_PEER_ADDRS:
7862 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
7865 case SCTP_GET_LOCAL_ADDRS:
7866 retval = sctp_getsockopt_local_addrs(sk, len, optval,
7869 case SCTP_SOCKOPT_CONNECTX3:
7870 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
7872 case SCTP_DEFAULT_SEND_PARAM:
7873 retval = sctp_getsockopt_default_send_param(sk, len,
7876 case SCTP_DEFAULT_SNDINFO:
7877 retval = sctp_getsockopt_default_sndinfo(sk, len,
7880 case SCTP_PRIMARY_ADDR:
7881 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
7884 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
7887 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
7889 case SCTP_ASSOCINFO:
7890 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
7892 case SCTP_I_WANT_MAPPED_V4_ADDR:
7893 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
7896 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
7898 case SCTP_GET_PEER_ADDR_INFO:
7899 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
7902 case SCTP_ADAPTATION_LAYER:
7903 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
7907 retval = sctp_getsockopt_context(sk, len, optval, optlen);
7909 case SCTP_FRAGMENT_INTERLEAVE:
7910 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
7913 case SCTP_PARTIAL_DELIVERY_POINT:
7914 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
7917 case SCTP_MAX_BURST:
7918 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
7921 case SCTP_AUTH_CHUNK:
7922 case SCTP_AUTH_DELETE_KEY:
7923 case SCTP_AUTH_DEACTIVATE_KEY:
7924 retval = -EOPNOTSUPP;
7926 case SCTP_HMAC_IDENT:
7927 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
7929 case SCTP_AUTH_ACTIVE_KEY:
7930 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
7932 case SCTP_PEER_AUTH_CHUNKS:
7933 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
7936 case SCTP_LOCAL_AUTH_CHUNKS:
7937 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
7940 case SCTP_GET_ASSOC_NUMBER:
7941 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
7943 case SCTP_GET_ASSOC_ID_LIST:
7944 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
7946 case SCTP_AUTO_ASCONF:
7947 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
7949 case SCTP_PEER_ADDR_THLDS:
7950 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
7952 case SCTP_GET_ASSOC_STATS:
7953 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
7955 case SCTP_RECVRCVINFO:
7956 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
7958 case SCTP_RECVNXTINFO:
7959 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
7961 case SCTP_PR_SUPPORTED:
7962 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
7964 case SCTP_DEFAULT_PRINFO:
7965 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
7968 case SCTP_PR_ASSOC_STATUS:
7969 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
7972 case SCTP_PR_STREAM_STATUS:
7973 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
7976 case SCTP_RECONFIG_SUPPORTED:
7977 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
7980 case SCTP_ENABLE_STREAM_RESET:
7981 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
7984 case SCTP_STREAM_SCHEDULER:
7985 retval = sctp_getsockopt_scheduler(sk, len, optval,
7988 case SCTP_STREAM_SCHEDULER_VALUE:
7989 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
7992 case SCTP_INTERLEAVING_SUPPORTED:
7993 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
7996 case SCTP_REUSE_PORT:
7997 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8000 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8003 retval = -ENOPROTOOPT;
8011 static int sctp_hash(struct sock *sk)
8017 static void sctp_unhash(struct sock *sk)
8022 /* Check if port is acceptable. Possibly find first available port.
8024 * The port hash table (contained in the 'global' SCTP protocol storage
8025 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8026 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8027 * list (the list number is the port number hashed out, so as you
8028 * would expect from a hash function, all the ports in a given list have
8029 * such a number that hashes out to the same list number; you were
8030 * expecting that, right?); so each list has a set of ports, with a
8031 * link to the socket (struct sock) that uses it, the port number and
8032 * a fastreuse flag (FIXME: NPI ipg).
8034 static struct sctp_bind_bucket *sctp_bucket_create(
8035 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8037 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8039 struct sctp_sock *sp = sctp_sk(sk);
8040 bool reuse = (sk->sk_reuse || sp->reuse);
8041 struct sctp_bind_hashbucket *head; /* hash list */
8042 kuid_t uid = sock_i_uid(sk);
8043 struct sctp_bind_bucket *pp;
8044 unsigned short snum;
8047 snum = ntohs(addr->v4.sin_port);
8049 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8054 /* Search for an available port. */
8055 int low, high, remaining, index;
8057 struct net *net = sock_net(sk);
8059 inet_get_local_port_range(net, &low, &high);
8060 remaining = (high - low) + 1;
8061 rover = prandom_u32() % remaining + low;
8065 if ((rover < low) || (rover > high))
8067 if (inet_is_local_reserved_port(net, rover))
8069 index = sctp_phashfn(sock_net(sk), rover);
8070 head = &sctp_port_hashtable[index];
8071 spin_lock(&head->lock);
8072 sctp_for_each_hentry(pp, &head->chain)
8073 if ((pp->port == rover) &&
8074 net_eq(sock_net(sk), pp->net))
8078 spin_unlock(&head->lock);
8079 } while (--remaining > 0);
8081 /* Exhausted local port range during search? */
8086 /* OK, here is the one we will use. HEAD (the port
8087 * hash table list entry) is non-NULL and we hold it's
8092 /* We are given an specific port number; we verify
8093 * that it is not being used. If it is used, we will
8094 * exahust the search in the hash list corresponding
8095 * to the port number (snum) - we detect that with the
8096 * port iterator, pp being NULL.
8098 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
8099 spin_lock(&head->lock);
8100 sctp_for_each_hentry(pp, &head->chain) {
8101 if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
8108 if (!hlist_empty(&pp->owner)) {
8109 /* We had a port hash table hit - there is an
8110 * available port (pp != NULL) and it is being
8111 * used by other socket (pp->owner not empty); that other
8112 * socket is going to be sk2.
8116 pr_debug("%s: found a possible match\n", __func__);
8118 if ((pp->fastreuse && reuse &&
8119 sk->sk_state != SCTP_SS_LISTENING) ||
8120 (pp->fastreuseport && sk->sk_reuseport &&
8121 uid_eq(pp->fastuid, uid)))
8124 /* Run through the list of sockets bound to the port
8125 * (pp->port) [via the pointers bind_next and
8126 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8127 * we get the endpoint they describe and run through
8128 * the endpoint's list of IP (v4 or v6) addresses,
8129 * comparing each of the addresses with the address of
8130 * the socket sk. If we find a match, then that means
8131 * that this port/socket (sk) combination are already
8134 sk_for_each_bound(sk2, &pp->owner) {
8135 struct sctp_sock *sp2 = sctp_sk(sk2);
8136 struct sctp_endpoint *ep2 = sp2->ep;
8139 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8140 sk2->sk_state != SCTP_SS_LISTENING) ||
8141 (sk->sk_reuseport && sk2->sk_reuseport &&
8142 uid_eq(uid, sock_i_uid(sk2))))
8145 if (sctp_bind_addr_conflict(&ep2->base.bind_addr,
8152 pr_debug("%s: found a match\n", __func__);
8155 /* If there was a hash table miss, create a new port. */
8157 if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
8160 /* In either case (hit or miss), make sure fastreuse is 1 only
8161 * if sk->sk_reuse is too (that is, if the caller requested
8162 * SO_REUSEADDR on this socket -sk-).
8164 if (hlist_empty(&pp->owner)) {
8165 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8170 if (sk->sk_reuseport) {
8171 pp->fastreuseport = 1;
8174 pp->fastreuseport = 0;
8177 if (pp->fastreuse &&
8178 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8181 if (pp->fastreuseport &&
8182 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8183 pp->fastreuseport = 0;
8186 /* We are set, so fill up all the data in the hash table
8187 * entry, tie the socket list information with the rest of the
8188 * sockets FIXME: Blurry, NPI (ipg).
8191 if (!sp->bind_hash) {
8192 inet_sk(sk)->inet_num = snum;
8193 sk_add_bind_node(sk, &pp->owner);
8199 spin_unlock(&head->lock);
8206 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8207 * port is requested.
8209 static int sctp_get_port(struct sock *sk, unsigned short snum)
8211 union sctp_addr addr;
8212 struct sctp_af *af = sctp_sk(sk)->pf->af;
8214 /* Set up a dummy address struct from the sk. */
8215 af->from_sk(&addr, sk);
8216 addr.v4.sin_port = htons(snum);
8218 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8219 return !!sctp_get_port_local(sk, &addr);
8223 * Move a socket to LISTENING state.
8225 static int sctp_listen_start(struct sock *sk, int backlog)
8227 struct sctp_sock *sp = sctp_sk(sk);
8228 struct sctp_endpoint *ep = sp->ep;
8229 struct crypto_shash *tfm = NULL;
8232 /* Allocate HMAC for generating cookie. */
8233 if (!sp->hmac && sp->sctp_hmac_alg) {
8234 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8235 tfm = crypto_alloc_shash(alg, 0, 0);
8237 net_info_ratelimited("failed to load transform for %s: %ld\n",
8238 sp->sctp_hmac_alg, PTR_ERR(tfm));
8241 sctp_sk(sk)->hmac = tfm;
8245 * If a bind() or sctp_bindx() is not called prior to a listen()
8246 * call that allows new associations to be accepted, the system
8247 * picks an ephemeral port and will choose an address set equivalent
8248 * to binding with a wildcard address.
8250 * This is not currently spelled out in the SCTP sockets
8251 * extensions draft, but follows the practice as seen in TCP
8255 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8256 if (!ep->base.bind_addr.port) {
8257 if (sctp_autobind(sk))
8260 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8261 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8266 sk->sk_max_ack_backlog = backlog;
8267 return sctp_hash_endpoint(ep);
8271 * 4.1.3 / 5.1.3 listen()
8273 * By default, new associations are not accepted for UDP style sockets.
8274 * An application uses listen() to mark a socket as being able to
8275 * accept new associations.
8277 * On TCP style sockets, applications use listen() to ready the SCTP
8278 * endpoint for accepting inbound associations.
8280 * On both types of endpoints a backlog of '0' disables listening.
8282 * Move a socket to LISTENING state.
8284 int sctp_inet_listen(struct socket *sock, int backlog)
8286 struct sock *sk = sock->sk;
8287 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8290 if (unlikely(backlog < 0))
8295 /* Peeled-off sockets are not allowed to listen(). */
8296 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8299 if (sock->state != SS_UNCONNECTED)
8302 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8305 /* If backlog is zero, disable listening. */
8307 if (sctp_sstate(sk, CLOSED))
8311 sctp_unhash_endpoint(ep);
8312 sk->sk_state = SCTP_SS_CLOSED;
8313 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8314 sctp_sk(sk)->bind_hash->fastreuse = 1;
8318 /* If we are already listening, just update the backlog */
8319 if (sctp_sstate(sk, LISTENING))
8320 sk->sk_max_ack_backlog = backlog;
8322 err = sctp_listen_start(sk, backlog);
8334 * This function is done by modeling the current datagram_poll() and the
8335 * tcp_poll(). Note that, based on these implementations, we don't
8336 * lock the socket in this function, even though it seems that,
8337 * ideally, locking or some other mechanisms can be used to ensure
8338 * the integrity of the counters (sndbuf and wmem_alloc) used
8339 * in this place. We assume that we don't need locks either until proven
8342 * Another thing to note is that we include the Async I/O support
8343 * here, again, by modeling the current TCP/UDP code. We don't have
8344 * a good way to test with it yet.
8346 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8348 struct sock *sk = sock->sk;
8349 struct sctp_sock *sp = sctp_sk(sk);
8352 poll_wait(file, sk_sleep(sk), wait);
8354 sock_rps_record_flow(sk);
8356 /* A TCP-style listening socket becomes readable when the accept queue
8359 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8360 return (!list_empty(&sp->ep->asocs)) ?
8361 (EPOLLIN | EPOLLRDNORM) : 0;
8365 /* Is there any exceptional events? */
8366 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
8368 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8369 if (sk->sk_shutdown & RCV_SHUTDOWN)
8370 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8371 if (sk->sk_shutdown == SHUTDOWN_MASK)
8374 /* Is it readable? Reconsider this code with TCP-style support. */
8375 if (!skb_queue_empty(&sk->sk_receive_queue))
8376 mask |= EPOLLIN | EPOLLRDNORM;
8378 /* The association is either gone or not ready. */
8379 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8382 /* Is it writable? */
8383 if (sctp_writeable(sk)) {
8384 mask |= EPOLLOUT | EPOLLWRNORM;
8386 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8388 * Since the socket is not locked, the buffer
8389 * might be made available after the writeable check and
8390 * before the bit is set. This could cause a lost I/O
8391 * signal. tcp_poll() has a race breaker for this race
8392 * condition. Based on their implementation, we put
8393 * in the following code to cover it as well.
8395 if (sctp_writeable(sk))
8396 mask |= EPOLLOUT | EPOLLWRNORM;
8401 /********************************************************************
8402 * 2nd Level Abstractions
8403 ********************************************************************/
8405 static struct sctp_bind_bucket *sctp_bucket_create(
8406 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8408 struct sctp_bind_bucket *pp;
8410 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8412 SCTP_DBG_OBJCNT_INC(bind_bucket);
8415 INIT_HLIST_HEAD(&pp->owner);
8417 hlist_add_head(&pp->node, &head->chain);
8422 /* Caller must hold hashbucket lock for this tb with local BH disabled */
8423 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8425 if (pp && hlist_empty(&pp->owner)) {
8426 __hlist_del(&pp->node);
8427 kmem_cache_free(sctp_bucket_cachep, pp);
8428 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8432 /* Release this socket's reference to a local port. */
8433 static inline void __sctp_put_port(struct sock *sk)
8435 struct sctp_bind_hashbucket *head =
8436 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8437 inet_sk(sk)->inet_num)];
8438 struct sctp_bind_bucket *pp;
8440 spin_lock(&head->lock);
8441 pp = sctp_sk(sk)->bind_hash;
8442 __sk_del_bind_node(sk);
8443 sctp_sk(sk)->bind_hash = NULL;
8444 inet_sk(sk)->inet_num = 0;
8445 sctp_bucket_destroy(pp);
8446 spin_unlock(&head->lock);
8449 void sctp_put_port(struct sock *sk)
8452 __sctp_put_port(sk);
8457 * The system picks an ephemeral port and choose an address set equivalent
8458 * to binding with a wildcard address.
8459 * One of those addresses will be the primary address for the association.
8460 * This automatically enables the multihoming capability of SCTP.
8462 static int sctp_autobind(struct sock *sk)
8464 union sctp_addr autoaddr;
8468 /* Initialize a local sockaddr structure to INADDR_ANY. */
8469 af = sctp_sk(sk)->pf->af;
8471 port = htons(inet_sk(sk)->inet_num);
8472 af->inaddr_any(&autoaddr, port);
8474 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8477 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8480 * 4.2 The cmsghdr Structure *
8482 * When ancillary data is sent or received, any number of ancillary data
8483 * objects can be specified by the msg_control and msg_controllen members of
8484 * the msghdr structure, because each object is preceded by
8485 * a cmsghdr structure defining the object's length (the cmsg_len member).
8486 * Historically Berkeley-derived implementations have passed only one object
8487 * at a time, but this API allows multiple objects to be
8488 * passed in a single call to sendmsg() or recvmsg(). The following example
8489 * shows two ancillary data objects in a control buffer.
8491 * |<--------------------------- msg_controllen -------------------------->|
8494 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8496 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8499 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8501 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8504 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8505 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8507 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8509 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8516 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8518 struct msghdr *my_msg = (struct msghdr *)msg;
8519 struct cmsghdr *cmsg;
8521 for_each_cmsghdr(cmsg, my_msg) {
8522 if (!CMSG_OK(my_msg, cmsg))
8525 /* Should we parse this header or ignore? */
8526 if (cmsg->cmsg_level != IPPROTO_SCTP)
8529 /* Strictly check lengths following example in SCM code. */
8530 switch (cmsg->cmsg_type) {
8532 /* SCTP Socket API Extension
8533 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8535 * This cmsghdr structure provides information for
8536 * initializing new SCTP associations with sendmsg().
8537 * The SCTP_INITMSG socket option uses this same data
8538 * structure. This structure is not used for
8541 * cmsg_level cmsg_type cmsg_data[]
8542 * ------------ ------------ ----------------------
8543 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8545 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8548 cmsgs->init = CMSG_DATA(cmsg);
8552 /* SCTP Socket API Extension
8553 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8555 * This cmsghdr structure specifies SCTP options for
8556 * sendmsg() and describes SCTP header information
8557 * about a received message through recvmsg().
8559 * cmsg_level cmsg_type cmsg_data[]
8560 * ------------ ------------ ----------------------
8561 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8563 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8566 cmsgs->srinfo = CMSG_DATA(cmsg);
8568 if (cmsgs->srinfo->sinfo_flags &
8569 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8570 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8571 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8576 /* SCTP Socket API Extension
8577 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8579 * This cmsghdr structure specifies SCTP options for
8580 * sendmsg(). This structure and SCTP_RCVINFO replaces
8581 * SCTP_SNDRCV which has been deprecated.
8583 * cmsg_level cmsg_type cmsg_data[]
8584 * ------------ ------------ ---------------------
8585 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8587 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8590 cmsgs->sinfo = CMSG_DATA(cmsg);
8592 if (cmsgs->sinfo->snd_flags &
8593 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8594 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8595 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8599 /* SCTP Socket API Extension
8600 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8602 * This cmsghdr structure specifies SCTP options for sendmsg().
8604 * cmsg_level cmsg_type cmsg_data[]
8605 * ------------ ------------ ---------------------
8606 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8608 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8611 cmsgs->prinfo = CMSG_DATA(cmsg);
8612 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8615 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8616 cmsgs->prinfo->pr_value = 0;
8619 /* SCTP Socket API Extension
8620 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8622 * This cmsghdr structure specifies SCTP options for sendmsg().
8624 * cmsg_level cmsg_type cmsg_data[]
8625 * ------------ ------------ ---------------------
8626 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8628 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8631 cmsgs->authinfo = CMSG_DATA(cmsg);
8633 case SCTP_DSTADDRV4:
8634 case SCTP_DSTADDRV6:
8635 /* SCTP Socket API Extension
8636 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8638 * This cmsghdr structure specifies SCTP options for sendmsg().
8640 * cmsg_level cmsg_type cmsg_data[]
8641 * ------------ ------------ ---------------------
8642 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8643 * ------------ ------------ ---------------------
8644 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8646 cmsgs->addrs_msg = my_msg;
8657 * Wait for a packet..
8658 * Note: This function is the same function as in core/datagram.c
8659 * with a few modifications to make lksctp work.
8661 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8666 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8668 /* Socket errors? */
8669 error = sock_error(sk);
8673 if (!skb_queue_empty(&sk->sk_receive_queue))
8676 /* Socket shut down? */
8677 if (sk->sk_shutdown & RCV_SHUTDOWN)
8680 /* Sequenced packets can come disconnected. If so we report the
8685 /* Is there a good reason to think that we may receive some data? */
8686 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8689 /* Handle signals. */
8690 if (signal_pending(current))
8693 /* Let another process have a go. Since we are going to sleep
8694 * anyway. Note: This may cause odd behaviors if the message
8695 * does not fit in the user's buffer, but this seems to be the
8696 * only way to honor MSG_DONTWAIT realistically.
8699 *timeo_p = schedule_timeout(*timeo_p);
8703 finish_wait(sk_sleep(sk), &wait);
8707 error = sock_intr_errno(*timeo_p);
8710 finish_wait(sk_sleep(sk), &wait);
8715 /* Receive a datagram.
8716 * Note: This is pretty much the same routine as in core/datagram.c
8717 * with a few changes to make lksctp work.
8719 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
8720 int noblock, int *err)
8723 struct sk_buff *skb;
8726 timeo = sock_rcvtimeo(sk, noblock);
8728 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
8729 MAX_SCHEDULE_TIMEOUT);
8732 /* Again only user level code calls this function,
8733 * so nothing interrupt level
8734 * will suddenly eat the receive_queue.
8736 * Look at current nfs client by the way...
8737 * However, this function was correct in any case. 8)
8739 if (flags & MSG_PEEK) {
8740 skb = skb_peek(&sk->sk_receive_queue);
8742 refcount_inc(&skb->users);
8744 skb = __skb_dequeue(&sk->sk_receive_queue);
8750 /* Caller is allowed not to check sk->sk_err before calling. */
8751 error = sock_error(sk);
8755 if (sk->sk_shutdown & RCV_SHUTDOWN)
8758 if (sk_can_busy_loop(sk)) {
8759 sk_busy_loop(sk, noblock);
8761 if (!skb_queue_empty(&sk->sk_receive_queue))
8765 /* User doesn't want to wait. */
8769 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
8778 /* If sndbuf has changed, wake up per association sndbuf waiters. */
8779 static void __sctp_write_space(struct sctp_association *asoc)
8781 struct sock *sk = asoc->base.sk;
8783 if (sctp_wspace(asoc) <= 0)
8786 if (waitqueue_active(&asoc->wait))
8787 wake_up_interruptible(&asoc->wait);
8789 if (sctp_writeable(sk)) {
8790 struct socket_wq *wq;
8793 wq = rcu_dereference(sk->sk_wq);
8795 if (waitqueue_active(&wq->wait))
8796 wake_up_interruptible(&wq->wait);
8798 /* Note that we try to include the Async I/O support
8799 * here by modeling from the current TCP/UDP code.
8800 * We have not tested with it yet.
8802 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8803 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
8809 static void sctp_wake_up_waiters(struct sock *sk,
8810 struct sctp_association *asoc)
8812 struct sctp_association *tmp = asoc;
8814 /* We do accounting for the sndbuf space per association,
8815 * so we only need to wake our own association.
8817 if (asoc->ep->sndbuf_policy)
8818 return __sctp_write_space(asoc);
8820 /* If association goes down and is just flushing its
8821 * outq, then just normally notify others.
8823 if (asoc->base.dead)
8824 return sctp_write_space(sk);
8826 /* Accounting for the sndbuf space is per socket, so we
8827 * need to wake up others, try to be fair and in case of
8828 * other associations, let them have a go first instead
8829 * of just doing a sctp_write_space() call.
8831 * Note that we reach sctp_wake_up_waiters() only when
8832 * associations free up queued chunks, thus we are under
8833 * lock and the list of associations on a socket is
8834 * guaranteed not to change.
8836 for (tmp = list_next_entry(tmp, asocs); 1;
8837 tmp = list_next_entry(tmp, asocs)) {
8838 /* Manually skip the head element. */
8839 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
8841 /* Wake up association. */
8842 __sctp_write_space(tmp);
8843 /* We've reached the end. */
8849 /* Do accounting for the sndbuf space.
8850 * Decrement the used sndbuf space of the corresponding association by the
8851 * data size which was just transmitted(freed).
8853 static void sctp_wfree(struct sk_buff *skb)
8855 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
8856 struct sctp_association *asoc = chunk->asoc;
8857 struct sock *sk = asoc->base.sk;
8859 sk_mem_uncharge(sk, skb->truesize);
8860 sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk);
8861 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
8862 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
8863 &sk->sk_wmem_alloc));
8866 struct sctp_shared_key *shkey = chunk->shkey;
8868 /* refcnt == 2 and !list_empty mean after this release, it's
8869 * not being used anywhere, and it's time to notify userland
8870 * that this shkey can be freed if it's been deactivated.
8872 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
8873 refcount_read(&shkey->refcnt) == 2) {
8874 struct sctp_ulpevent *ev;
8876 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
8880 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
8882 sctp_auth_shkey_release(chunk->shkey);
8886 sctp_wake_up_waiters(sk, asoc);
8888 sctp_association_put(asoc);
8891 /* Do accounting for the receive space on the socket.
8892 * Accounting for the association is done in ulpevent.c
8893 * We set this as a destructor for the cloned data skbs so that
8894 * accounting is done at the correct time.
8896 void sctp_sock_rfree(struct sk_buff *skb)
8898 struct sock *sk = skb->sk;
8899 struct sctp_ulpevent *event = sctp_skb2event(skb);
8901 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8904 * Mimic the behavior of sock_rfree
8906 sk_mem_uncharge(sk, event->rmem_len);
8910 /* Helper function to wait for space in the sndbuf. */
8911 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8914 struct sock *sk = asoc->base.sk;
8915 long current_timeo = *timeo_p;
8919 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
8922 /* Increment the association's refcnt. */
8923 sctp_association_hold(asoc);
8925 /* Wait on the association specific sndbuf space. */
8927 prepare_to_wait_exclusive(&asoc->wait, &wait,
8928 TASK_INTERRUPTIBLE);
8929 if (asoc->base.dead)
8933 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
8935 if (signal_pending(current))
8936 goto do_interrupted;
8937 if (sk_under_memory_pressure(sk))
8939 if ((int)msg_len <= sctp_wspace(asoc) &&
8940 sk_wmem_schedule(sk, msg_len))
8943 /* Let another process have a go. Since we are going
8947 current_timeo = schedule_timeout(current_timeo);
8949 if (sk != asoc->base.sk)
8952 *timeo_p = current_timeo;
8956 finish_wait(&asoc->wait, &wait);
8958 /* Release the association's refcnt. */
8959 sctp_association_put(asoc);
8972 err = sock_intr_errno(*timeo_p);
8980 void sctp_data_ready(struct sock *sk)
8982 struct socket_wq *wq;
8985 wq = rcu_dereference(sk->sk_wq);
8986 if (skwq_has_sleeper(wq))
8987 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
8988 EPOLLRDNORM | EPOLLRDBAND);
8989 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8993 /* If socket sndbuf has changed, wake up all per association waiters. */
8994 void sctp_write_space(struct sock *sk)
8996 struct sctp_association *asoc;
8998 /* Wake up the tasks in each wait queue. */
8999 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9000 __sctp_write_space(asoc);
9004 /* Is there any sndbuf space available on the socket?
9006 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9007 * associations on the same socket. For a UDP-style socket with
9008 * multiple associations, it is possible for it to be "unwriteable"
9009 * prematurely. I assume that this is acceptable because
9010 * a premature "unwriteable" is better than an accidental "writeable" which
9011 * would cause an unwanted block under certain circumstances. For the 1-1
9012 * UDP-style sockets or TCP-style sockets, this code should work.
9015 static bool sctp_writeable(struct sock *sk)
9017 return sk->sk_sndbuf > sk->sk_wmem_queued;
9020 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9021 * returns immediately with EINPROGRESS.
9023 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9025 struct sock *sk = asoc->base.sk;
9027 long current_timeo = *timeo_p;
9030 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9032 /* Increment the association's refcnt. */
9033 sctp_association_hold(asoc);
9036 prepare_to_wait_exclusive(&asoc->wait, &wait,
9037 TASK_INTERRUPTIBLE);
9040 if (sk->sk_shutdown & RCV_SHUTDOWN)
9042 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9045 if (signal_pending(current))
9046 goto do_interrupted;
9048 if (sctp_state(asoc, ESTABLISHED))
9051 /* Let another process have a go. Since we are going
9055 current_timeo = schedule_timeout(current_timeo);
9058 *timeo_p = current_timeo;
9062 finish_wait(&asoc->wait, &wait);
9064 /* Release the association's refcnt. */
9065 sctp_association_put(asoc);
9070 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9073 err = -ECONNREFUSED;
9077 err = sock_intr_errno(*timeo_p);
9085 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9087 struct sctp_endpoint *ep;
9091 ep = sctp_sk(sk)->ep;
9095 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9096 TASK_INTERRUPTIBLE);
9098 if (list_empty(&ep->asocs)) {
9100 timeo = schedule_timeout(timeo);
9105 if (!sctp_sstate(sk, LISTENING))
9109 if (!list_empty(&ep->asocs))
9112 err = sock_intr_errno(timeo);
9113 if (signal_pending(current))
9121 finish_wait(sk_sleep(sk), &wait);
9126 static void sctp_wait_for_close(struct sock *sk, long timeout)
9131 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9132 if (list_empty(&sctp_sk(sk)->ep->asocs))
9135 timeout = schedule_timeout(timeout);
9137 } while (!signal_pending(current) && timeout);
9139 finish_wait(sk_sleep(sk), &wait);
9142 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9144 struct sk_buff *frag;
9149 /* Don't forget the fragments. */
9150 skb_walk_frags(skb, frag)
9151 sctp_skb_set_owner_r_frag(frag, sk);
9154 sctp_skb_set_owner_r(skb, sk);
9157 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9158 struct sctp_association *asoc)
9160 struct inet_sock *inet = inet_sk(sk);
9161 struct inet_sock *newinet;
9162 struct sctp_sock *sp = sctp_sk(sk);
9163 struct sctp_endpoint *ep = sp->ep;
9165 newsk->sk_type = sk->sk_type;
9166 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9167 newsk->sk_flags = sk->sk_flags;
9168 newsk->sk_tsflags = sk->sk_tsflags;
9169 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9170 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9171 newsk->sk_reuse = sk->sk_reuse;
9172 sctp_sk(newsk)->reuse = sp->reuse;
9174 newsk->sk_shutdown = sk->sk_shutdown;
9175 newsk->sk_destruct = sctp_destruct_sock;
9176 newsk->sk_family = sk->sk_family;
9177 newsk->sk_protocol = IPPROTO_SCTP;
9178 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9179 newsk->sk_sndbuf = sk->sk_sndbuf;
9180 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9181 newsk->sk_lingertime = sk->sk_lingertime;
9182 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9183 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9184 newsk->sk_rxhash = sk->sk_rxhash;
9186 newinet = inet_sk(newsk);
9188 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9189 * getsockname() and getpeername()
9191 newinet->inet_sport = inet->inet_sport;
9192 newinet->inet_saddr = inet->inet_saddr;
9193 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9194 newinet->inet_dport = htons(asoc->peer.port);
9195 newinet->pmtudisc = inet->pmtudisc;
9196 newinet->inet_id = asoc->next_tsn ^ jiffies;
9198 newinet->uc_ttl = inet->uc_ttl;
9199 newinet->mc_loop = 1;
9200 newinet->mc_ttl = 1;
9201 newinet->mc_index = 0;
9202 newinet->mc_list = NULL;
9204 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9205 net_enable_timestamp();
9207 /* Set newsk security attributes from orginal sk and connection
9208 * security attribute from ep.
9210 security_sctp_sk_clone(ep, sk, newsk);
9213 static inline void sctp_copy_descendant(struct sock *sk_to,
9214 const struct sock *sk_from)
9216 int ancestor_size = sizeof(struct inet_sock) +
9217 sizeof(struct sctp_sock) -
9218 offsetof(struct sctp_sock, pd_lobby);
9220 if (sk_from->sk_family == PF_INET6)
9221 ancestor_size += sizeof(struct ipv6_pinfo);
9223 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9226 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9227 * and its messages to the newsk.
9229 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9230 struct sctp_association *assoc,
9231 enum sctp_socket_type type)
9233 struct sctp_sock *oldsp = sctp_sk(oldsk);
9234 struct sctp_sock *newsp = sctp_sk(newsk);
9235 struct sctp_bind_bucket *pp; /* hash list port iterator */
9236 struct sctp_endpoint *newep = newsp->ep;
9237 struct sk_buff *skb, *tmp;
9238 struct sctp_ulpevent *event;
9239 struct sctp_bind_hashbucket *head;
9242 /* Migrate socket buffer sizes and all the socket level options to the
9245 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9246 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9247 /* Brute force copy old sctp opt. */
9248 sctp_copy_descendant(newsk, oldsk);
9250 /* Restore the ep value that was overwritten with the above structure
9256 /* Hook this new socket in to the bind_hash list. */
9257 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9258 inet_sk(oldsk)->inet_num)];
9259 spin_lock_bh(&head->lock);
9260 pp = sctp_sk(oldsk)->bind_hash;
9261 sk_add_bind_node(newsk, &pp->owner);
9262 sctp_sk(newsk)->bind_hash = pp;
9263 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9264 spin_unlock_bh(&head->lock);
9266 /* Copy the bind_addr list from the original endpoint to the new
9267 * endpoint so that we can handle restarts properly
9269 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9270 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9274 /* New ep's auth_hmacs should be set if old ep's is set, in case
9275 * that net->sctp.auth_enable has been changed to 0 by users and
9276 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9278 if (oldsp->ep->auth_hmacs) {
9279 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9284 /* Move any messages in the old socket's receive queue that are for the
9285 * peeled off association to the new socket's receive queue.
9287 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9288 event = sctp_skb2event(skb);
9289 if (event->asoc == assoc) {
9290 __skb_unlink(skb, &oldsk->sk_receive_queue);
9291 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9292 sctp_skb_set_owner_r_frag(skb, newsk);
9296 /* Clean up any messages pending delivery due to partial
9297 * delivery. Three cases:
9298 * 1) No partial deliver; no work.
9299 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9300 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9302 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9304 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9305 struct sk_buff_head *queue;
9307 /* Decide which queue to move pd_lobby skbs to. */
9308 if (assoc->ulpq.pd_mode) {
9309 queue = &newsp->pd_lobby;
9311 queue = &newsk->sk_receive_queue;
9313 /* Walk through the pd_lobby, looking for skbs that
9314 * need moved to the new socket.
9316 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9317 event = sctp_skb2event(skb);
9318 if (event->asoc == assoc) {
9319 __skb_unlink(skb, &oldsp->pd_lobby);
9320 __skb_queue_tail(queue, skb);
9321 sctp_skb_set_owner_r_frag(skb, newsk);
9325 /* Clear up any skbs waiting for the partial
9326 * delivery to finish.
9328 if (assoc->ulpq.pd_mode)
9329 sctp_clear_pd(oldsk, NULL);
9333 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9335 /* Set the type of socket to indicate that it is peeled off from the
9336 * original UDP-style socket or created with the accept() call on a
9337 * TCP-style socket..
9341 /* Mark the new socket "in-use" by the user so that any packets
9342 * that may arrive on the association after we've moved it are
9343 * queued to the backlog. This prevents a potential race between
9344 * backlog processing on the old socket and new-packet processing
9345 * on the new socket.
9347 * The caller has just allocated newsk so we can guarantee that other
9348 * paths won't try to lock it and then oldsk.
9350 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9351 sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
9352 sctp_assoc_migrate(assoc, newsk);
9353 sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
9355 /* If the association on the newsk is already closed before accept()
9356 * is called, set RCV_SHUTDOWN flag.
9358 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9359 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9360 newsk->sk_shutdown |= RCV_SHUTDOWN;
9362 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9365 release_sock(newsk);
9371 /* This proto struct describes the ULP interface for SCTP. */
9372 struct proto sctp_prot = {
9374 .owner = THIS_MODULE,
9375 .close = sctp_close,
9376 .disconnect = sctp_disconnect,
9377 .accept = sctp_accept,
9378 .ioctl = sctp_ioctl,
9379 .init = sctp_init_sock,
9380 .destroy = sctp_destroy_sock,
9381 .shutdown = sctp_shutdown,
9382 .setsockopt = sctp_setsockopt,
9383 .getsockopt = sctp_getsockopt,
9384 .sendmsg = sctp_sendmsg,
9385 .recvmsg = sctp_recvmsg,
9387 .backlog_rcv = sctp_backlog_rcv,
9389 .unhash = sctp_unhash,
9390 .get_port = sctp_get_port,
9391 .obj_size = sizeof(struct sctp_sock),
9392 .useroffset = offsetof(struct sctp_sock, subscribe),
9393 .usersize = offsetof(struct sctp_sock, initmsg) -
9394 offsetof(struct sctp_sock, subscribe) +
9395 sizeof_field(struct sctp_sock, initmsg),
9396 .sysctl_mem = sysctl_sctp_mem,
9397 .sysctl_rmem = sysctl_sctp_rmem,
9398 .sysctl_wmem = sysctl_sctp_wmem,
9399 .memory_pressure = &sctp_memory_pressure,
9400 .enter_memory_pressure = sctp_enter_memory_pressure,
9401 .memory_allocated = &sctp_memory_allocated,
9402 .sockets_allocated = &sctp_sockets_allocated,
9405 #if IS_ENABLED(CONFIG_IPV6)
9407 #include <net/transp_v6.h>
9408 static void sctp_v6_destroy_sock(struct sock *sk)
9410 sctp_destroy_sock(sk);
9411 inet6_destroy_sock(sk);
9414 struct proto sctpv6_prot = {
9416 .owner = THIS_MODULE,
9417 .close = sctp_close,
9418 .disconnect = sctp_disconnect,
9419 .accept = sctp_accept,
9420 .ioctl = sctp_ioctl,
9421 .init = sctp_init_sock,
9422 .destroy = sctp_v6_destroy_sock,
9423 .shutdown = sctp_shutdown,
9424 .setsockopt = sctp_setsockopt,
9425 .getsockopt = sctp_getsockopt,
9426 .sendmsg = sctp_sendmsg,
9427 .recvmsg = sctp_recvmsg,
9429 .backlog_rcv = sctp_backlog_rcv,
9431 .unhash = sctp_unhash,
9432 .get_port = sctp_get_port,
9433 .obj_size = sizeof(struct sctp6_sock),
9434 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9435 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9436 offsetof(struct sctp6_sock, sctp.subscribe) +
9437 sizeof_field(struct sctp6_sock, sctp.initmsg),
9438 .sysctl_mem = sysctl_sctp_mem,
9439 .sysctl_rmem = sysctl_sctp_rmem,
9440 .sysctl_wmem = sysctl_sctp_wmem,
9441 .memory_pressure = &sctp_memory_pressure,
9442 .enter_memory_pressure = sctp_enter_memory_pressure,
9443 .memory_allocated = &sctp_memory_allocated,
9444 .sockets_allocated = &sctp_sockets_allocated,
9446 #endif /* IS_ENABLED(CONFIG_IPV6) */